.TH TLSSRV 8
.SH NAME
tlssrv, tlsclient, tlssrvtunnel, tlsclienttunnel \- TLS server and client
.SH SYNOPSIS
.PP
.B tlssrv
[
.B -c
.I cert.pem
]
[
.B -l
.I
logfile
]
[
.B -r
.I remotesys
]
.I cmd
[
.I args ...
]
.PP
.B tlsclient
[
.B -D
]
[
.B -c
.I cert.pem
]
[
.B -t
.I trustedkeys
]
[
.B -x
.I excludedkeys
]
.I address
.PP
.B tlssrvtunnel
.I plain-addr
.I crypt-addr
.I cert.pem
.PP
.B tlsclienttunnel
.I crypt-addr
.I plain-addr
.I trustedkeys
.SH DESCRIPTION
.I Tlssrv
is a helper program, typically exec'd in a
.B /bin/service
file to establish an SSL or TLS connection before launching
.I cmd
.IR args ;
a typical command might start the IMAP or HTTP server.
.I Cert.pem
is the server certificate;
.IR factotum (4)
should hold the corresponding private key.
The specified
.I logfile
is by convention the same as for the target server.
.I Remotesys
is mainly used for logging.
.PP
.I Tlsclient
is the reverse of
.IR tlssrv :
it dials
.IR address ,
starts TLS,
and then relays 
between the network connection
and standard input and output.
The
.B -D
flag enables some debug output.
Specifying a certificate in pem(8) format with the
.B -c
flag, causes the client to submit this certificate upon
server's request. A corresponding key has to be present in
.IR factotum(4).
If the
.B -t
flag
(and, optionally, the
.B -x
flag)
is given, the remote server must present a key
whose SHA1 hash is listed in
the file
.I trustedkeys
but not in the file
.IR excludedkeys .
See
.IR thumbprint (6)
for more information.
.PP
.I Tlssrvtunnel
and
.I tlsclienttunnel
use these tools and
.I listen1
(see
.IR listen (8))
to provide TLS network tunnels, allowing legacy
application to take advantage of TLS encryption.
.SH EXAMPLES
Listen for TLS-encrypted IMAP by creating a server certificate
.B /sys/lib/tls/imap.pem
and a listener script
.B /bin/service.auth/tcp993
containing:
.IP
.EX
#!/bin/rc
exec tlssrv -c/sys/lib/tls/imap.pem -limap4d -r`{cat $3/remote} \e
    /bin/ip/imap4d -p -dyourdomain -r`{cat $3/remote} \e
    >[2]/sys/log/imap4d
.EE
.PP
Interact with the server, putting the appropriate hash into
.B /sys/lib/tls/mail
and running:
.IP
.EX
tlsclient -t /sys/lib/tls/mail tcp!server!imaps
.EE
.PP
Create a TLS-encrypted VNC connection from a client on
.B kremvax
to a server on
.BR moscvax :
.IP
.EX
mosc% vncs -d :3
mosc% tlssrvtunnel tcp!moscvax!5903 tcp!*!12345 \e
        /usr/you/lib/cert.pem
krem% tlsclienttunnel tcp!moscvax!12345 tcp!*!5905 \e
        /usr/you/lib/cert.thumb
krem% vncv kremvax:5
.EE
.LP
(The port numbers passed to the VNC tools are offset by 5900 from the
actual TCP port numbers.)
.SH FILES
.TP
.B /sys/lib/tls
.SH SOURCE
.B /sys/src/cmd/tlssrv.c
.br
.B /sys/src/cmd/tlsclient.c
.br
.B /rc/bin/tlssrvtunnel
.br
.B /rc/bin/tlsclienttunnel
.SH "SEE ALSO"
.IR factotum (4),
.IR listen (8),
.IR rsa (8)
.br
Unix's
.I stunnel