This is an update of the series previously posted: v1: https://lists.gnu.org/archive/html/qemu-devel/2015-11/msg06126.html v2: https://lists.gnu.org/archive/html/qemu-devel/2016-01/msg01580.html v3: https://lists.gnu.org/archive/html/qemu-devel/2016-01/msg03440.html
This series of patches implements support for TLS in the QEMU NBD server and client code. It is implementing the NBD_OPT_STARTTLS option that was previously discussed here: https://www.redhat.com/archives/libvir-list/2014-October/msg00506.html And is also described in the NBD spec here: https://github.com/yoe/nbd/blob/master/doc/proto.md To ensure that clients always get a suitable error message from the NBD server when it is configured with TLS, a client speaking the new style protocol will always send NBD_OPT_LIST as the first thing it does, so that we can see the NBD_REP_ERR_TLS_REQD response. This should all be backwards & forwards compatible with previous QEMU impls of NBD Usage of TLS is described in the commit messages for each patch, but for sake of people who don't want to explore the series, here's the summary Starting QEMU system emulator with a disk backed by an TLS encrypted NBD export $ qemu-system-x86_64 \ -object tls-creds-x509,id=tls0,endpoint=client,dir=/home/berrange/security/qemutls \ -drive driver=nbd,host=localhost,port=9000,tls-creds=tls0 Starting a standalone NBD server providing a TLS encrypted NBD export $ qemu-nbd \ --object tls-creds-x509,id=tls0,endpoint=server,dir=/home/berrange/security/qemutls --tls-creds tls0 \ --export-name default \ $IMAGEFILE The --export-name is optional, if omitted, the default "" will be used. Starting a QEMU system emulator built-in NBD server $ qemu-system-x86_64 \ -qmp unix:/tmp/qmp,server \ -hda /home/berrange/Fedora-Server-netinst-x86_64-23.iso \ -object tls-creds-x509,id=tls0,dir=/home/berrange/security/qemutls,endpoint=server $ qmp-shell /tmp/qmp (qmp) nbd-server-start addr={"host":"localhost","port":"9000"} tls-creds=tls0 (qmp) nbd-server-add device=ide0-hd0 This series depends on this bug fix I recently sent: https://lists.gnu.org/archive/html/qemu-devel/2016-01/msg03406.html And the qemu-nbd/etc command line options work https://lists.gnu.org/archive/html/qemu-devel/2016-01/msg03381.html The first 4 patches are the conversion to the I/O channels framework. The next 6 patches are general tweaks to QEMU's impl of the NBD protocol for better compliance and/or future proofing. The next patch provides the NBD protocol TLS implementation. The final 3 patches allow TLS to be enabled in the QEMU NBD client and servers. Changed in v4: - Don't pick the first export name in the list if no export name is provided (Paolo) - Set client requested export name to "" if none is provided by the user (Paolo) - Set server advertized export name to "" if TLS is enabled and none is provided by the user (Paolo) - Rename qemu-nbd --exportname to --export-name (Paolo) - Use iov_discard_front() to simplify iov handling (Paolo) Changed in v3: - Rebase to resolve conflicts with recently merged NBD patches Changed in v2: - Fix error codes used during NBD TLS option negotiate - Update patch with helpers for UserCreatable object types Daniel P. Berrange (14): nbd: convert block client to use I/O channels for connection setup nbd: convert qemu-nbd server to use I/O channels for connection setup nbd: convert blockdev NBD server to use I/O channels for connection setup nbd: convert to using I/O channels for actual socket I/O nbd: invert client logic for negotiating protocol version nbd: make server compliant with fixed newstyle spec nbd: make client request fixed new style if advertized nbd: allow setting of an export name for qemu-nbd server nbd: always query export list in fixed new style protocol nbd: use "" as a default export name if none provided nbd: implement TLS support in the protocol negotiation nbd: enable use of TLS with NBD block driver nbd: enable use of TLS with qemu-nbd server nbd: enable use of TLS with nbd-server-start command Makefile | 6 +- block/nbd-client.c | 91 +++++++---- block/nbd-client.h | 10 +- block/nbd.c | 105 ++++++++++--- blockdev-nbd.c | 131 +++++++++++++--- hmp.c | 2 +- include/block/nbd.h | 28 +++- nbd/client.c | 440 +++++++++++++++++++++++++++++++++++++++++++++------- nbd/common.c | 83 ++++++---- nbd/nbd-internal.h | 32 ++-- nbd/server.c | 334 ++++++++++++++++++++++++++++----------- qapi/block.json | 4 +- qemu-nbd.c | 159 ++++++++++++++----- qemu-nbd.texi | 7 + qmp-commands.hx | 2 +- tests/Makefile | 2 +- 16 files changed, 1123 insertions(+), 313 deletions(-) -- 2.5.0
