NAMESPACE(6) Games Manual NAMESPACE(6)NAME
namespace - name space description file
DESCRIPTION
Namespace files describe how to construct a name space from scratch, an operation normally performed by the newns subroutine (see auth(2))
which is typically called by init(8). Each line specifies one name space operation. Spaces and tabs separate arguments to operations; no
quotes or escapes are recognized. Blank lines and lines with # as the first non-space character are ignored. Environment variables of the
form $name are expanded within arguments, where name is a UTF string terminated by white space, a /, or a $.
The known operations and their arguments are:
mount [-abc] servename old [spec]
Mount servename on old.
bind [-abc] new old
Bind new on old.
import [-abc] host "[remotepath]mountpoint
Import remotepath from machine server and attach it to mountpoint.
cd dir Change the working directory to dir.
The options for bind, mount, and import are interpreted as in bind(1) and import(4).
SEE ALSO bind(1), namespace(4), init(8)NAMESPACE(6)
Check Out this Related Man Page
NAMESPACE.CONF(5) Linux-PAM Manual NAMESPACE.CONF(5)NAME
namespace.conf - the namespace configuration file
DESCRIPTION
The pam_namespace.so module allows setup of private namespaces with polyinstantiated directories. Directories can be polyinstantiated based
on user name or, in the case of SELinux, user name, sensitivity level or complete security context. If an executable script
/etc/security/namespace.init exists, it is used to initialize the namespace every time an instance directory is set up and mounted. The
script receives the polyinstantiated directory path and the instance directory path as its arguments.
The /etc/security/namespace.conf file specifies which directories are polyinstantiated, how they are polyinstantiated, how instance
directories would be named, and any users for whom polyinstantiation would not be performed.
When someone logs in, the file namespace.conf is scanned. Comments are marked by # characters. Each non comment line represents one
polyinstantiated directory. The fields are separated by spaces but can be quoted by " characters also escape sequences ,
, and are
recognized. The fields are as follows:
polydirinstance_prefixmethodlist_of_uids
The first field, polydir, is the absolute pathname of the directory to polyinstantiate. The special string $HOME is replaced with the
user's home directory, and $USER with the username. This field cannot be blank.
The second field, instance_prefix is the string prefix used to build the pathname for the instantiation of <polydir>. Depending on the
polyinstantiation method it is then appended with "instance differentiation string" to generate the final instance directory path. This
directory is created if it did not exist already, and is then bind mounted on the <polydir> to provide an instance of <polydir> based on
the <method> column. The special string $HOME is replaced with the user's home directory, and $USER with the username. This field cannot be
blank.
The third field, method, is the method used for polyinstantiation. It can take these values; "user" for polyinstantiation based on user
name, "level" for polyinstantiation based on process MLS level and user name, "context" for polyinstantiation based on process security
context and user name, "tmpfs" for mounting tmpfs filesystem as an instance dir, and "tmpdir" for creating temporary directory as an
instance dir which is removed when the user's session is closed. Methods "context" and "level" are only available with SELinux. This field
cannot be blank.
The fourth field, list_of_uids, is a comma separated list of user names for whom the polyinstantiation is not performed. If left blank,
polyinstantiation will be performed for all users. If the list is preceded with a single "~" character, polyinstantiation is performed only
for users in the list.
The method field can contain also following optional flags separated by : characters.
create=mode,owner,group - create the polyinstantiated directory. The mode, owner and group parameters are optional. The default for mode is
determined by umask, the default owner is the user whose session is opened, the default group is the primary group of the user.
iscript=path - path to the instance directory init script. The base directory for relative paths is /etc/security/namespace.d.
noinit - instance directory init script will not be executed.
shared - the instance directories for "context" and "level" methods will not contain the user name and will be shared among all users.
mntopts=value - value of this flag is passed to the mount call when the tmpfs mount is done. It allows for example the specification of the
maximum size of the tmpfs instance that is created by the mount call. See mount(8) for details.
The directory where polyinstantiated instances are to be created, must exist and must have, by default, the mode of 0000. The requirement
that the instance parent be of mode 0000 can be overridden with the command line option ignore_instance_parent_mode
In case of context or level polyinstantiation the SELinux context which is used for polyinstantiation is the context used for executing a
new process as obtained by getexeccon. This context must be set by the calling application or pam_selinux.so module. If this context is not
set the polyinstatiation will be based just on user name.
The "instance differentiation string" is <user name> for "user" method and <user name>_<raw directory context> for "context" and "level"
methods. If the whole string is too long the end of it is replaced with md5sum of itself. Also when command line option gen_hash is used
the whole string is replaced with md5sum of itself.
EXAMPLES
These are some example lines which might be specified in /etc/security/namespace.conf.
# The following three lines will polyinstantiate /tmp,
# /var/tmp and user's home directories. /tmp and /var/tmp
# will be polyinstantiated based on the security level
# as well as user name, whereas home directory will be
# polyinstantiated based on the full security context and user name.
# Polyinstantiation will not be performed for user root
# and adm for directories /tmp and /var/tmp, whereas home
# directories will be polyinstantiated for all users.
#
# Note that instance directories do not have to reside inside
# the polyinstantiated directory. In the examples below,
# instances of /tmp will be created in /tmp-inst directory,
# where as instances of /var/tmp and users home directories
# will reside within the directories that are being
# polyinstantiated.
#
/tmp /tmp-inst/ level root,adm
/var/tmp /var/tmp/tmp-inst/ level root,adm
$HOME $HOME/$USER.inst/inst- context
For the <service>s you need polyinstantiation (login for example) put the following line in /etc/pam.d/<service> as the last line for
session group:
session required pam_namespace.so [arguments]
This module also depends on pam_selinux.so setting the context.
SEE ALSO pam_namespace(8), pam.d(5), pam(8)AUTHORS
The namespace.conf manual page was written by Janak Desai <janak@us.ibm.com>. More features added by Tomas Mraz <tmraz@redhat.com>.
Linux-PAM Manual 09/19/2013 NAMESPACE.CONF(5)