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9e6bc47bb5
The default_tls_x509_verify (and related) parameters in qemu.conf
control whether the QEMU TLS servers request & verify certificates
from clients. This works as a simple access control system for
servers by requiring the CA to issue certs to permitted clients.
This use of client certificates is disabled by default, since it
requires extra work to issue client certificates.
Unfortunately the code was using this configuration parameter when
setting up both TLS clients and servers in QEMU. The result was that
TLS clients for character devices and disk devices had verification
turned off, meaning they would ignore errors while validating the
server certificate.
This allows for trivial MITM attacks between client and server,
as any certificate returned by the attacker will be accepted by
the client.
This is assigned CVE-2017-1000256 / LSN-2017-0002
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
(cherry picked from commit 441d3eb6d1)
39 lines
1.3 KiB
Plaintext
39 lines
1.3 KiB
Plaintext
LC_ALL=C \
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PATH=/bin \
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HOME=/home/test \
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USER=test \
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LOGNAME=test \
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QEMU_AUDIO_DRV=none \
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/usr/bin/qemu \
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-name QEMUGuest1 \
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-S \
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-object secret,id=masterKey0,format=raw,\
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file=/tmp/lib/domain--1-QEMUGuest1/master-key.aes \
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-M pc \
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-m 214 \
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-smp 1,sockets=1,cores=1,threads=1 \
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-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
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-nographic \
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-nodefconfig \
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-nodefaults \
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-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-QEMUGuest1/monitor.sock,\
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server,nowait \
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-mon chardev=charmonitor,id=monitor,mode=readline \
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-no-acpi \
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-boot c \
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-usb \
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-drive file=/dev/HostVG/QEMUGuest1,format=raw,if=none,id=drive-ide0-0-0 \
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-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 \
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-chardev udp,id=charserial0,host=127.0.0.1,port=2222,localaddr=127.0.0.1,\
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localport=1111 \
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-device isa-serial,chardev=charserial0,id=serial0 \
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-object secret,id=charserial1-secret0,\
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data=9eao5F8qtkGt+seB1HYivWIxbtwUu6MQtg1zpj/oDtUsPr1q8wBYM91uEHCn6j/1,\
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keyid=masterKey0,iv=AAECAwQFBgcICQoLDA0ODw==,format=base64 \
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-object tls-creds-x509,id=objcharserial1_tls0,dir=/etc/pki/libvirt-chardev,\
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endpoint=client,verify-peer=yes,passwordid=charserial1-secret0 \
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-chardev socket,id=charserial1,host=127.0.0.1,port=5555,\
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tls-creds=objcharserial1_tls0 \
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-device isa-serial,chardev=charserial1,id=serial1 \
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-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3
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