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usr.sbin/rpc.tlsclntd/rpc.tlsclntd.8

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				.\" Copyright (c) 2008 Isilon Inc http://www.isilon.com/
				.\" Authors: Doug Rabson <dfr@rabson.org>
				.\" Developed with Red Inc: Alfred Perlstein <alfred@FreeBSD.org>
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				.\" $FreeBSD$
				.\"
				.\" Modified from gssd.8 for rpc.tlsclntd.8 by Rick Macklem.
				.Dd February 17, 2021
				.Dt RPC.TLSCLNTD 8
				.Os
				.Sh NAME
				.Nm rpc.tlsclntd
				.Nd "Sun RPC over TLS Client Daemon"
				.Sh SYNOPSIS
				.Nm
				.Op Fl C Ar preferred_ciphers
				.Op Fl D Ar certdir
				.Op Fl d
				.Op Fl l Ar CAfile
				.Op Fl m
				.Op Fl p Ar CApath
				.Op Fl r Ar CRLfile
				.Op Fl v
				.Sh DESCRIPTION
				The
				.Nm
				program provides support for the client side of the kernel Sun RPC over TLS
				implementation.
				This daemon must be running for the kernel RPC to be able to do a TLS
				connection to a server for an NFS over TLS mount.
				This daemon requires that the kernel be built with
				.Dq options KERNEL_TLS
				and be running on an architecture such as
				.Dq amd64
				that supports a direct map (not i386) with
				.Xr ktls 4
				enabled.
				.Pp
				If either of the
				.Fl l
				or
				.Fl p
				options have been specified, the daemon will require the server's
				certificate to verify
				and have a Fully Qualified Domain Name (FQDN) in it.
				This FQDN must match
				the reverse DNS name for the IP address that
				the server is using for the TCP connection.
				The FQDN may be
				in either the DNS field of the subjectAltName or the CN field of the
				subjectName in the certificate and
				cannot have a wildcard
				.Dq *
				in it.
				.Pp
				If a SIGHUP signal is sent to the daemon it will reload the
				.Dq CRLfile
				and will shut down any extant connections that presented certificates
				during TLS handshake that have been revoked.
				If the
				.Fl r
				option was not specified, the SIGHUP signal will be ignored.
				.Pp
				The daemon will log failed certificate verifications via
				.Xr syslogd 8
				using LOG_INFO \| LOG_DAEMON when the
				.Fl l
				or
				.Fl p
				option has been specified.
				.Pp
				The options are as follows:
				.Bl -tag -width indent
				.It Fl C Ar preferred_ciphers , Fl Fl ciphers= Ns Ar preferred_ciphers
				Specify what preferred ciphers are to be used.
				If this option is specified,
				.Dq SSL_CTX_set_cipher_list()
				will be called with
				.Dq preferred_ciphers
				as the argument.
				If this option is not specified, the cipher will be chosen by
				.Xr ssl 7 .
				.It Fl D Ar certdir , Fl Fl certdir= Ns Ar certdir
				Use
				.Dq certdir
				instead of /etc/rpc.tlsclntd for the
				.Fl m
				option.
				.It Fl d , Fl Fl debuglevel
				Run in debug mode.
				In this mode,
				.Nm
				will not fork when it starts.
				.It Fl l Ar CAfile , Fl Fl verifylocs= Ns Ar CAfile
				This specifies the path name of a CAfile which holds the information
				for server certificate verification.
				This path name is used in
				.Dq SSL_CTX_load_verify_locations(ctx,CAfile,NULL)
				and
				.Dq SSL_CTX_set0_CA_list(ctx,SSL_load_client_CA_file(CAfile))
				openssl library calls.
				Note that this is a path name for the file and is not assumed to be
				in
				.Dq certdir .
				.It Fl m , Fl Fl mutualverf
				Enable support for mutual authentication.
				A certificate and associated key must be found in /etc/rpc.tlsclntd
				(or the directory specified by the
				.Fl D
				option)
				in case a server requests a peer certificate.
				The first certificate needs to be in a file named
				.Dq cert.pem
				and the associated key in a file named
				.Dq certkey.pem .
				The
				.Xr mount_nfs 8
				option
				.Fl tlscertname
				can be used to override the default certificate for a given
				NFS mount, where the files use the alternate naming specified by the option.
				If there is a passphrase on the
				.Dq certkey.pem
				file, this daemon will prompt for the passphrase during startup.
				The keys for alternate certificates cannot have passphrases.
				.It Fl p Ar CApath , Fl Fl verifydir= Ns Ar CApath
				This option is similar to the
				.Fl l
				option, but specifies the path of a directory with CA
				certificates in it.
				When this option is used,
				.Dq SSL_CTX_set0_CA_list(ctx,SSL_load_client_CA_file())
				is not called, so a list of CA names is not be passed
				to the server during the TLS handshake.
				The openssl documentation indicates this call is rarely needed.
				.It Fl r Ar CRLfile , Fl Fl crl= Ns Ar CRLfile
				This option specifies a Certificate Revocation List (CRL) file
				that is to be loaded into the verify certificate store and
				checked during verification of the server's certificate.
				This option is meaningless unless either the
				.Fl l
				or
				.Fl p
				have been specified.
				.It Fl v , Fl Fl verbose
				Run in verbose mode.
				In this mode,
				.Nm
				will log activity messages to syslog using LOG_INFO \| LOG_DAEMON or to
				stderr, if the
				.Fl d
				option has also been specified.
				.El
				.Sh EXIT STATUS
				.Ex -std
				.Sh SEE ALSO
				.Xr openssl 1 ,
				.Xr ktls 4 ,
				.Xr mount_nfs 8 ,
				.Xr rpc.tlsservd 8 ,
				.Xr ssl 7 ,
				.Xr syslogd 8
				.Sh STANDARDS
				The implementation is based on the specification in
				.Rs
				.%B "RFC NNNN"
				.%T "Towards Remote Procedure Call Encryption By Default"
				.Re
				.Sh HISTORY
				The
				.Nm
				manual page first appeared in
				.Fx 13.0 .
				.Sh BUGS
				This daemon cannot be safely shut down and restarted if there are
				any active RPC-over-TLS connections.
				Doing so will orphan the KERNEL_TLS connections, so that they
				can no longer do upcalls successfully, since the
				.Dq SSL *
				structures in userspace have been lost.