ab0c29af05
An internet draft titled "Towards Remote Procedure Call Encryption By Default" describes how TLS is to be used for Sun RPC, with NFS as an intended use case. This patch adds client and server support for this to the kernel RPC, using KERN_TLS and upcalls to daemons for the handshake, peer reset and other non-application data record cases. The upcalls to the daemons use three fields to uniquely identify the TCP connection. They are the time.tv_sec, time.tv_usec of the connection establshment, plus a 64bit sequence number. The time fields avoid problems with re-use of the sequence number after a daemon restart. For the server side, once a Null RPC with AUTH_TLS is received, kernel reception on the socket is blocked and an upcall to the rpctlssd(8) daemon is done to perform the TLS handshake. Upon completion, the completion status of the handshake is stored in xp_tls as flag bits and the reply to the Null RPC is sent. For the client, if CLSET_TLS has been set, a new TCP connection will send the Null RPC with AUTH_TLS to initiate the handshake. The client kernel RPC code will then block kernel I/O on the socket and do an upcall to the rpctlscd(8) daemon to perform the handshake. If the upcall is successful, ct_rcvstate will be maintained to indicate if/when an upcall is being done. If non-application data records are received, the code does an upcall to the appropriate daemon, which will do a SSL_read() of 0 length to handle the record(s). When the socket is being shut down, upcalls are done to the daemons, so that they can perform SSL_shutdown() calls to perform the "peer reset". The rpctlssd(8) and rpctlscd(8) daemons require a patched version of the openssl library and, as such, will not be committed to head at this time. Although the changes done by this patch are fairly numerous, there should be no semantics change to the kernel RPC at this time. A future commit to the NFS code will optionally enable use of TLS for NFS.
73 lines
2.2 KiB
Plaintext
73 lines
2.2 KiB
Plaintext
/*-
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* Copyright (c) 2008 Isilon Inc http://www.isilon.com/
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* Authors: Doug Rabson <dfr@rabson.org>
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* Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* Modified from gssd.x for the client side of RPC-over-TLS. */
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/* $FreeBSD$ */
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struct rpctlscd_connect_res {
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uint32_t reterr;
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uint64_t sec;
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uint64_t usec;
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uint64_t ssl;
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};
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struct rpctlscd_handlerecord_arg {
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uint64_t sec;
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uint64_t usec;
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uint64_t ssl;
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};
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struct rpctlscd_handlerecord_res {
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uint32_t reterr;
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};
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struct rpctlscd_disconnect_arg {
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uint64_t sec;
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uint64_t usec;
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uint64_t ssl;
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};
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struct rpctlscd_disconnect_res {
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uint32_t reterr;
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};
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program RPCTLSCD {
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version RPCTLSCDVERS {
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void RPCTLSCD_NULL(void) = 0;
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rpctlscd_connect_res
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RPCTLSCD_CONNECT(void) = 1;
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rpctlscd_handlerecord_res
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RPCTLSCD_HANDLERECORD(rpctlscd_handlerecord_arg) = 2;
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rpctlscd_disconnect_res
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RPCTLSCD_DISCONNECT(rpctlscd_disconnect_arg) = 3;
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} = 1;
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} = 0x40677374;
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