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RPC.TLSSERVD(8) FreeBSD System Manager's Manual RPC.TLSSERVD(8) NAME rpc.tlsservd -- Sun RPC over TLS Server Daemon SYNOPSIS rpc.tlsservd [-D certdir] [-d] [-h] [-l CAfile] [-m] [-n domain] [-p CApath] [-r CRLfile] [-u] [-v] [-W] [-w] DESCRIPTION The rpc.tlsservd program provides support for the server side of the ker- nel Sun RPC over TLS implementation. This daemon must be running to al- low the kernel RPC to perform the TLS handshake after a TCP client has sent the STARTTLS Null RPC request to the server. This daemon requires that the kernel be built with "options KERNEL_TLS" and be running on an architecture such as "amd64" that supports a direct map (not i386) with ktls(4) enabled. Note that the -tls option in the exports(5) file speci- fies that the client must use RPC over TLS. The -tlscert option in the exports(5) file specifies that the client must provide a certificate that verifies. The -tlscertuser option in the exports(5) file specifies that the client must provide a certificate that verifies and has a other- Name:1.3.6.1.4.1.2238.1.1.1;UTF8: field of subjectAltName of the form "user@domain" where "domain" matches the one for this server and "user" is a valid user name that maps to a <uid, gid_list>. For the latter two cases, the -m and either the -l or -p options must be specified. The -tlscertuser option also requires that the -u option on this daemon be specified. Also, if the IP address used by the client cannot be trusted, the rules in exports(5) cannot be applied safely. As such, the -h option can be used along with -m and either the -l or -p options to require that the client certificate have the correct Fully Qualified Domain Name (FQDN) in it. A certificate and associated key must exist in /etc/rpc.tlsservd (or the "certdir" specified by the -D option) in files named "cert.pem" and "certkey.pem". If a SIGHUP signal is sent to the daemon it will reload the "CRLfile" and will shut down any extant connections that presented certificates during TLS handshake that have been revoked. If the -r option was not speci- fied, the SIGHUP signal will be ignored. The daemon will log failed certificate verifications via syslogd(8) using LOG_INFO | LOG_DAEMON when the -m option has been specified. The options are as follows: -D certdir, --certdir=certdir Use "certdir" instead of /etc/rpc.tlsservd as the location for the certificate in a file called "cert.pem" and associated key in "certkey.pem". -d, --debuglevel Run in debug mode. In this mode, rpc.tlsservd will not fork when it starts. -h, --checkhost This option specifies that the client must provide a certificate that both verifies and has a FQDN that matches the reverse DNS name for the IP address that the client uses to connect to the server. The FQDN should be in the DNS field of the subjectAlt- Name, but is also allowed to be in the CN field of the subject- Name in the certificate. By default, a wildcard "*" in the FQDN is not allowed. With this option, a failure to verify the client certificate or match the FQDN will result in the server sending AUTH_REJECTEDCRED replies to all client RPCs. This option re- quires the -m and either the -l or -p options. -l CAfile, --verifylocs=CAfile This option specifies the path name of a CA certificate(s) file in pem format, which is used to verify client certificates and to set the list of CA(s) sent to the client so that it knows which certificate to send to the server during the TLS handshake. This path name is used in "SSL_CTX_load_verify_locations(ctx,CAfile,NULL)" and "SSL_CTX_set_client_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 "certdir". Either this option or the -p option must be specified when the -m option is speci- fied so that the daemon can verify the client's certificate. -m, --mutualverf This option specifies that the server is to request a certificate from the client during the TLS handshake. It does not require that the client provide a certificate. It should be specified unless no client doing RPC over TLS is required to have a cer- tificate. For NFS, either the exports(5) option -tlscert or -tlscertuser may be used to require a client to provide a cer- tificate that verifies. See exports(5). -n domain, --domain=domain This option specifies what the "domain" is for use with the -u option, overriding the domain taken from the gethostname(2) of the server this daemon is running on. If you have specified the -domain command line option for nfsuserd(8) then you should spec- ify this option with the same "domain" that was specified for nfsuserd(8). This option is only meaningful when used with the -u option. -p CApath, --verifydir=CApath This option is similar to the -l option, but specifies the path of a directory with CA certificates in it. When this option is used, "SSL_CTX_set_client_CA_list(ctx,SSL_load_client_CA_file())" is not called, so a list of CA names might not be passed to the client during the TLS handshake. -r CRLfile, --crl=CRLfile This option specifies a Certificate Revocation List (CRL) file that is to be loaded into the verify certificate store and checked during verification. This option is only meaningful when either the -l or -p have been specified. -u, --certuser This option specifies that if the client provides a certificate that both verifies and has a subjectAltName with an otherName component of the form "otherName:1.3.6.1.4.1.2238.1.1.1;UTF8:user@domain" where "domain" matches the one for this server, then the daemon will attempt to map "user" in the above to a user credential <uid, gid_list>. There should only be one of these otherName compo- nents for each "domain". If "user" is a valid username in the password database, then the <uid, gid_list> for "user" will be used for all RPCs on the mount instead of the credentials in the RPC request header. This option requires the -m and either the -l or -p options. Use of this option might not conform to RFC- NNNN, which does not allow certificates to be used for user au- thentication. -v, --verbose Run in verbose mode. In this mode, rpc.tlsservd will log activ- ity messages to syslogd(8) using LOG_INFO | LOG_DAEMON or to stderr, if the -d option has also been specified. -W, --multiwild This option is used with the -h option to allow use of a wildcard "*" that matches multiple components of the reverse DNS name for the client's IP address. For example, the FQDN "*.uoguelph.ca" would match both "laptop21.uoguelph.ca" and "laptop3.cis.uoguelph.ca". -w, --singlewild Similar to -W but allows the wildcard "*" to match a single com- ponent of the reverse DNS name. For example, the FQDN "*.uoguelph.ca" would match "laptop21.uoguelph.ca" but not "laptop3.cis.uoguelph.ca". Only one of the -W and -w options is allowed. EXIT STATUS The rpc.tlsservd utility exits 0 on success, and >0 if an error occurs. SEE ALSO openssl(1), ktls(4), exports(5), mount_nfs(8), nfsuserd(8), rpc.tlsclntd(8), syslogd(8) STANDARDS The implementation is based on the specification in "Towards Remote Procedure Call Encryption By Default", RFC NNNN. HISTORY The rpc.tlsservd manual page first appeared in FreeBSD 13.0. BUGS This daemon cannot be safely shut down and restarted if there are any ac- tive RPC-over-TLS connections. Doing so will orphan the KERNEL_TLS con- nections, so that they can no longer do upcalls successfully, since the "SSL *" structures in userspace have been lost. FreeBSD 13.0 January 29, 2021 FreeBSD 13.0
NAME | SYNOPSIS | DESCRIPTION | EXIT STATUS | SEE ALSO | STANDARDS | HISTORY | BUGS
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