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Re: [libvirt] [PATCH v3] Added new attribute mount_security to filesystem element



2010/10/11 Harsh Prateek Bora <harsh 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 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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