TLSSRV(8) TLSSRV(8)
NAME
tlssrv, tlsclient, tlssrvtunnel, tlsclienttunnel - TLS
server and client
SYNOPSIS
tlssrv [ -D ] [ -[aA] [ -k keyspec ] ] [ -c cert.pem ] [ -l
logfile ] [ -r remotesys ] cmd [ args ... ]
tlsclient [ -D ] [ -a [ -k keyspec ] ] [ -c clientcert.pem ]
[ -d servercert ] [ -t trustedkeys ] [ -x excludedkeys ] [
-n servername ] [ -o ] address [ cmd [ args ... ] ]
tlssrvtunnel plain-addr crypt-addr cert.pem
tlsclienttunnel crypt-addr plain-addr trustedkeys
DESCRIPTION
Tlssrv is a helper program, typically exec'd in a
/bin/service file to establish an SSL or TLS connection
before launching cmd args; a typical command might start the
IMAP or HTTP server. Cert.pem is the server certificate;
factotum(4) should hold the corresponding private key. The
specified logfile is by convention the same as for the tar-
get server. Remotesys is mainly used for logging. If the
-a or -A flag is specified, p9any authentication is run
before the TLS handshake and the resulting plan9 session
secret is used as a pre-shared key for TLS encryption. This
enables the use of TLS without certificates and also runs
the server command as the authorized user when the -a flag
was specified.
Tlsclient is the reverse of tlssrv: it connects to address,
starts TLS, and then relays between the network connection
and standard input and output or executes cmd args with
standard input and output redirected to the connection. The
-D flag enables some debug output. Specifying a certificate
in pem(8) format with the -c flag, causes the client to sub-
mit this certificate upon server's request. A corresponding
key has to be present in factotum(4). The -d flag writes the
server's certificate to the file servercert in binary ASN.1
encoding. If the server doesnt provide a certificate, an
empty file is created. If the -t flag (and, optionally, the
-x flag) is given, the remote server must present a public
key whose SHA1 or SHA256 hash is listed in the file
trustedkeys but not in the file excludedkeys. See
thumbprint(6) for more information. The -n option passes the
string servername in the TLS hello message (Server Name
Idenfitication) which is usefull when talking to webservers.
When the -o option was specified, address is interpreted as
a filename to be opend read-write instead of a dial string.
Page 1 Plan 9 (printed 12/3/24)
TLSSRV(8) TLSSRV(8)
Tlssrvtunnel and tlsclienttunnel use these tools and listen1
(see listen(8)) to provide TLS network tunnels, allowing
legacy application to take advantage of TLS encryption.
EXAMPLES
Listen for TLS-encrypted IMAP by creating a server certifi-
cate /sys/lib/tls/imap.pem and a listener script
/bin/service.auth/tcp993 containing:
#!/bin/rc
exec tlssrv -c/sys/lib/tls/imap.pem -limap4d -r`{cat $3/remote} \
/bin/ip/imap4d -p -dyourdomain -r`{cat $3/remote} \
>[2]/sys/log/imap4d
Interact with the server, putting the appropriate hash into
/sys/lib/tls/mail and running:
tlsclient -t /sys/lib/tls/mail tcp!server!imaps
Create a TLS-encrypted VNC connection from a client on
kremvax to a server on moscvax:
mosc% vncs -d :3
mosc% tlssrvtunnel tcp!moscvax!5903 tcp!*!12345 \
/usr/you/lib/cert.pem
krem% tlsclienttunnel tcp!moscvax!12345 tcp!*!5905 \
/usr/you/lib/cert.thumb
krem% vncv kremvax:5
(The port numbers passed to the VNC tools are offset by 5900
from the actual TCP port numbers.)
FILES
/sys/lib/tls
SOURCE
/sys/src/cmd/tlssrv.c
/sys/src/cmd/tlsclient.c
/rc/bin/tlssrvtunnel
/rc/bin/tlsclienttunnel
SEE ALSO
factotum(4), listen(8), rsa(8)
Unix's stunnel
Page 2 Plan 9 (printed 12/3/24)