[libvirt] [PATCH v3] Added new attribute mount_security to filesystem element
Matthias Bolte
matthias.bolte at googlemail.com
Wed Oct 13 15:52:57 UTC 2010
2010/10/11 Harsh Prateek Bora <harsh at linux.vnet.ibm.com>:
> This patch introduces new attribute to filesystem element
> to support customizable security for mount type.
> Valid mount_security are: passthrough and mapped.
>
> Usage:
> <filesystem type='mount' mount_security='passthrough'>
> <source dir='/export/to/guest'/>
> <target dir='mount_tag'/>
> </filesystem>
>
> Here is the detailed explanation on these security models:
>
> Security model: mapped
> ----------------------
>
> Fileserver intercepts and maps all the file object create requests.
> Files on the fileserver will be created with Fileserver's user credentials
> and the
> client-user's credentials are stored in extended attributes.
> During getattr() server extracts the client-user's credentials from extended
> attributes and sends to the client.
>
> This adds a great deal of security in the cloud environments where the
> guest's(client) user space is kept completely isolated from host's user
> space.
>
>
> Security model : passthrough
> ----------------------------
>
> In this security model, Fileserver passes down all requests to the
> underlying filesystem. File system objects on the fileserver will be created
> with client-user's credentials. This is done by setting setuid()/setgid()
> during creation or chmod/chown after file creation. At the end of create
> protocol
> request, files on the fileserver will be owned by cleint-user's uid/gid.
> This model mimic's current NFSv3 level of security.
>
> Note: This patch is based on Daniel's patch to support 9pfs.
> It shall be applied after applying Daniel's patch to support 9pfs.
>
> v3:
> - QEMU cmdline still uses security_model, changes done by mistake reverted.
>
> Signed-off-by: Harsh Prateek Bora <harsh at linux.vnet.ibm.com>
> ---
> docs/schemas/domain.rng | 6 ++++++
> src/conf/domain_conf.c | 29 +++++++++++++++++++++++++++--
> src/conf/domain_conf.h | 10 ++++++++++
> src/qemu/qemu_conf.c | 9 +++++++--
> 4 files changed, 50 insertions(+), 4 deletions(-)
>
This patch lacks documentation about the new domain XML attributes in
docs/formatdomain.html.in.
Matthias
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