mirror of
https://github.com/ceph/ceph
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8d60cd1ac2
Replace Ceph distributed file system with Ceph distributed storage system to help reduce the idea that Ceph is just a file system. Signed-off-by: Loic Dachary <loic@dachary.org>
177 lines
5.1 KiB
ReStructuredText
177 lines
5.1 KiB
ReStructuredText
=================================================
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ceph-authtool -- ceph keyring manipulation tool
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=================================================
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.. program:: ceph-authtool
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Synopsis
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========
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| **ceph-authtool** *keyringfile* [ -l | --list ] [ -C | --create-keyring
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] [ -p | --print ] [ -n | --name *entityname* ] [ --gen-key ] [ -a |
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--add-key *base64_key* ] [ --caps *capfile* ]
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Description
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===========
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**ceph-authtool** is a utility to create, view, and modify a Ceph keyring
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file. A keyring file stores one or more Ceph authentication keys and
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possibly an associated capability specification. Each key is
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associated with an entity name, of the form
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``{client,mon,mds,osd}.name``.
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**WARNING** Ceph provides authentication and protection against
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man-in-the-middle attacks once secret keys are in place. However,
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data over the wire is not encrypted, which may include the messages
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used to configure said keys. The system is primarily intended to be
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used in trusted environments.
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Options
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=======
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.. option:: -l, --list
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will list all keys and capabilities present in the keyring
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.. option:: -p, --print
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will print an encoded key for the specified entityname. This is
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suitable for the ``mount -o secret=`` argument
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.. option:: -C, --create-keyring
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will create a new keyring, overwriting any existing keyringfile
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.. option:: --gen-key
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will generate a new secret key for the specified entityname
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.. option:: --add-key
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will add an encoded key to the keyring
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.. option:: --cap subsystem capability
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will set the capability for given subsystem
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.. option:: --caps capsfile
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will set all of capabilities associated with a given key, for all subsystems
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Capabilities
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============
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The subsystem is the name of a Ceph subsystem: ``mon``, ``mds``, or
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``osd``.
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The capability is a string describing what the given user is allowed
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to do. This takes the form of a comma separated list of allow
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clauses with a permission specifier containing one or more of rwx for
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read, write, and execute permission. The ``allow *`` grants full
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superuser permissions for the given subsystem.
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For example::
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# can read, write, and execute objects
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osd = "allow rwx"
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# can access mds server
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mds = "allow"
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# can modify cluster state (i.e., is a server daemon)
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mon = "allow rwx"
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A librados user restricted to a single pool might look like::
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mon = "allow r"
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osd = "allow rw pool foo"
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A client using rbd with read access to one pool and read/write access to another::
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mon = "allow r"
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osd = "allow class-read object_prefix rbd_children, allow pool templates r class-read, allow pool vms rwx"
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A client mounting the file system with minimal permissions would need caps like::
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mds = "allow"
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osd = "allow rw pool data"
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mon = "allow r"
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OSD Capabilities
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================
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In general, an osd capability follows the grammar::
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osdcap := grant[,grant...]
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grant := allow (match capspec | capspec match)
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match := [pool[=]<poolname> | object_prefix <prefix>]
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capspec := * | [r][w][x] [class-read] [class-write]
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The capspec determines what kind of operations the entity can perform::
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r = read access to objects
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w = write access to objects
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x = can call any class method (same as class-read class-write)
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class-read = can call class methods that are reads
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class-write = can call class methods that are writes
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* = equivalent to rwx, plus the ability to run osd admin commands,
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i.e. ceph osd tell ...
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The match criteria restrict a grant based on the pool being accessed.
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Grants are additive if the client fulfills the match condition. For
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example, if a client has the osd capabilities: "allow r object_prefix
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prefix, allow w pool foo, allow x pool bar", then it has rw access to
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pool foo, rx access to pool bar, and r access to objects whose
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names begin with 'prefix' in any pool.
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Caps file format
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================
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The caps file format consists of zero or more key/value pairs, one per
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line. The key and value are separated by an ``=``, and the value must
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be quoted (with ``'`` or ``"``) if it contains any whitespace. The key
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is the name of the Ceph subsystem (``osd``, ``mds``, ``mon``), and the
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value is the capability string (see above).
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Example
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=======
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To create a new keyring containing a key for client.foo::
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ceph-authtool -C -n client.foo --gen-key keyring
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To associate some capabilities with the key (namely, the ability to
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mount a Ceph filesystem)::
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ceph-authtool -n client.foo --cap mds 'allow' --cap osd 'allow rw pool=data' --cap mon 'allow r' keyring
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To display the contents of the keyring::
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ceph-authtool -l keyring
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When mount a Ceph file system, you can grab the appropriately encoded secret key with::
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mount -t ceph serverhost:/ mountpoint -o name=foo,secret=`ceph-authtool -p -n client.foo keyring`
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Availability
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============
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**ceph-authtool** is part of the Ceph distributed storage system. Please
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refer to the Ceph documentation at http://ceph.com/docs for more
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information.
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See also
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========
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:doc:`ceph <ceph>`\(8)
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