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This misc series of changes:

Browse source 
- Improves documentation of SSH fingerprint checking
  - Fixes SHA256 fingerprints with non-blockdev usage
  - Blocks the clone3, setns, unshare & execveat syscalls
    with seccomp
  - Blocks process spawning via clone syscall, but allows
    threads, with seccomp
  - Takes over seccomp maintainer role
  - Expands firmware descriptor spec to allow flash
    without NVRAM
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Merge remote-tracking branch 'remotes/berrange-gitlab/tags/misc-next-pull-request' into staging

This misc series of changes:

 - Improves documentation of SSH fingerprint checking
 - Fixes SHA256 fingerprints with non-blockdev usage
 - Blocks the clone3, setns, unshare & execveat syscalls
   with seccomp
 - Blocks process spawning via clone syscall, but allows
   threads, with seccomp
 - Takes over seccomp maintainer role
 - Expands firmware descriptor spec to allow flash
   without NVRAM

# gpg: Signature made Thu 17 Feb 2022 11:57:13 GMT
# gpg:                using RSA key DAF3A6FDB26B62912D0E8E3FBE86EBB415104FDF
# gpg: Good signature from "Daniel P. Berrange <dan@berrange.com>" [full]
# gpg:                 aka "Daniel P. Berrange <berrange@redhat.com>" [full]
# Primary key fingerprint: DAF3 A6FD B26B 6291 2D0E  8E3F BE86 EBB4 1510 4FDF

* remotes/berrange-gitlab/tags/misc-next-pull-request:
  docs: expand firmware descriptor to allow flash without NVRAM
  MAINTAINERS: take over seccomp from Eduardo Otubo
  seccomp: block setns, unshare and execveat syscalls
  seccomp: block use of clone3 syscall
  seccomp: fix blocking of process spawning
  seccomp: add unit test for seccomp filtering
  seccomp: allow action to be customized per syscall
  block: print the server key type and fingerprint on failure
  block: support sha256 fingerprint with pre-blockdev options
  block: better document SSH host key fingerprint checking

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2022-02-23 09:25:05 +00:00
commit 4aa2e497a9
7 changed files with 599 additions and 87 deletions
Download patch file Download diff file Expand all files Collapse all files

30
docs/system/qemu-block-drivers.rst.inc
View file

@ -778,10 +778,32 @@ The optional *HOST_KEY_CHECK* parameter controls how the remote
host's key is checked. The default is ``yes`` which means to use
the local ``.ssh/known_hosts`` file. Setting this to ``no``
turns off known-hosts checking. Or you can check that the host key
matches a specific fingerprint:
``host_key_check=md5:78:45:8e:14:57:4f:d5:45:83:0a:0e:f3:49:82:c9:c8``
(``sha1:`` can also be used as a prefix, but note that OpenSSH
tools only use MD5 to print fingerprints).
matches a specific fingerprint. The fingerprint can be provided in
``md5``, ``sha1``, or ``sha256`` format, however, it is strongly
recommended to only use ``sha256``, since the other options are
considered insecure by modern standards. The fingerprint value
must be given as a hex encoded string::
host_key_check=sha256:04ce2ae89ff4295a6b9c4111640bdcb3297858ee55cb434d9dd88796e93aa795
The key string may optionally contain ":" separators between
each pair of hex digits.
The ``$HOME/.ssh/known_hosts`` file contains the base64 encoded
host keys. These can be converted into the format needed for
QEMU using a command such as::
$ for key in `grep 10.33.8.112 known_hosts | awk '{print $3}'`
do
echo $key | base64 -d | sha256sum
done
6c3aa525beda9dc83eadfbd7e5ba7d976ecb59575d1633c87cd06ed2ed6e366f -
12214fd9ea5b408086f98ecccd9958609bd9ac7c0ea316734006bc7818b45dc8 -
d36420137bcbd101209ef70c3b15dc07362fbe0fa53c5b135eba6e6afa82f0ce -
Note that there can be multiple keys present per host, each with
different key ciphers. Care is needed to pick the key fingerprint
that matches the cipher QEMU will negotiate with the remote server.
Currently authentication must be done using ssh-agent. Other
authentication methods may be supported in future.