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dbd87af80b
When deleting an HBAC rule we need to ensure that an SELinux user map isn't pointing at it. We need to take what is the cn of the HBAC rule and see if that rule exists, then return the dn to that rule. The search was not being done properly and wasn't enforcing uniqueness. It could have returned partial matches as well (so tests for the search test). https://fedorahosted.org/freeipa/ticket/2269
451 lines
15 KiB
Python
451 lines
15 KiB
Python
# Authors:
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# Rob Crittenden <rcritten@redhat.com>
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#
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# Copyright (C) 2011 Red Hat
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# see file 'COPYING' for use and warranty information
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from ipalib import api, errors
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from ipalib import Str, StrEnum
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from ipalib.plugins.baseldap import *
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from ipalib import _, ngettext
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from ipalib.plugins.hbacrule import is_all
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__doc__ = _("""
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SELinux User Mapping
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Map IPA users to SELinux users by host.
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Hosts, hostgroups, users and groups can be either defined within
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the rule or it may point to an existing HBAC rule. When using
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--hbacrule option to selinuxusermap-find an exact match is made on the
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HBAC rule name, so only one or zero entries will be returned.
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EXAMPLES:
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Create a rule, "test1", that sets all users to xguest_u:s0 on the host "server":
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ipa selinuxusermap-add --usercat=all --selinuxuser=xguest_u:s0 test1
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ipa selinuxusermap-add-host --hosts=server.example.com test1
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Create a rule, "test2", that sets all users to guest_u:s0 and uses an existing HBAC rule for users and hosts:
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ipa selinuxusermap-add --usercat=all --hbacrule=webserver --selinuxuser=guest_u:s0 test1
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Display the properties of a named HBAC rule:
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ipa selinuxusermap-show test1
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Create a rule for a specific user. This sets the SELinux context for
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user john to unconfined_u:s0-s0:c0.c1023 on any machine:
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ipa selinuxusermap-add --hostcat=all --selinuxuser=unconfined_u:s0-s0:c0.c1023 john_unconfined
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ipa selinuxusermap-add-user --users=john john_unconfined
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Disable a named rule:
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ipa selinuxusermap-disable test1
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Enable a named rule:
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ipa selinuxusermap-enable test1
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Find a rule referencing a specific HBAC rule:
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ipa selinuxusermap-find --hbacrule=allow_some
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Remove a named rule:
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ipa selinuxusermap-del john_unconfined
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SEEALSO:
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The list controlling the order in which the SELinux user map is applied
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and the default SELinux user are available in the config-show commond.
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""")
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notboth_err = _('HBAC rule and local members cannot both be set')
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def validate_selinuxuser(ugettext, user):
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"""
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An SELinux user has 3 components: user:MLS:MCS
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user traditionally ends with _u but this is not mandatory. Regex is ^[a-zA-Z][a-zA-Z_]*
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The MLS part can only be
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Level: s[0-15](-s[0-15])
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Then MCS could be c[0-1023].c[0-1023] and/or c[0-1023]-c[0-c0123]
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Meaning
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s0 s0-s1 s0-s15:c0.c1023 s0-s1:c0,c2,c15.c26 s0-s0:c0.c1023
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Returns a message on invalid, returns nothing on valid.
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"""
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regex_name = re.compile(r'^[a-zA-Z][a-zA-Z_]*$')
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regex_mls = re.compile(r'^s[0-9][1-5]{0,1}(-s[0-9][1-5]{0,1}){0,1}$')
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regex_mcs = re.compile(r'^c(\d+)([.,-]c(\d+))*?$')
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# If we add in ::: we don't have to check to see if some values are
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# empty
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(name, mls, mcs, ignore) = (user + ':::').split(':',3)
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if not regex_name.match(name):
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return _('Invalid SELinux user name, only a-Z and _ are allowed')
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if mls and not regex_mls.match(mls):
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return _('Invalid MLS value, must match s[0-15](-s[0-15])')
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if mcs and not regex_mcs.match(mcs):
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return _('Invalid MCS value, must match c[0-1023].c[0-1023] and/or c[0-1023]-c[0-c0123]')
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return None
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def validate_selinuxuser_inlist(ldap, user):
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"""
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Ensure the user is in the list of allowed SELinux users.
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Returns nothing if the user is found, raises an exception otherwise.
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"""
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config = ldap.get_ipa_config()[1]
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item = config.get('ipaselinuxusermaporder', [])
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if len(item) != 1:
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raise errors.NotFound(reason=_('SELinux user map list not found in configuration'))
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userlist = item[0].split('$')
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if user not in userlist:
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raise errors.NotFound(reason=_('SELinux user %(user)s not found in ordering list (in config)') % dict(user=user))
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return
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class selinuxusermap(LDAPObject):
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"""
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SELinux User Map object.
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"""
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container_dn = api.env.container_selinux
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object_name = _('SELinux User Map rule')
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object_name_plural = _('SELinux User Map rules')
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object_class = ['ipaassociation', 'ipaselinuxusermap']
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default_attributes = [
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'cn', 'ipaenabledflag',
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'description', 'usercategory', 'hostcategory',
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'ipaenabledflag', 'memberuser', 'memberhost',
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'memberhostgroup', 'seealso', 'ipaselinuxuser',
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]
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uuid_attribute = 'ipauniqueid'
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rdn_attribute = 'ipauniqueid'
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attribute_members = {
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'memberuser': ['user', 'group'],
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'memberhost': ['host', 'hostgroup'],
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}
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# These maps will not show as members of other entries
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label = _('SELinux User Maps')
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label_singular = _('SELinux User Map')
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takes_params = (
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Str('cn',
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cli_name='name',
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label=_('Rule name'),
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primary_key=True,
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),
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Str('ipaselinuxuser', validate_selinuxuser,
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cli_name='selinuxuser',
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label=_('SELinux User'),
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),
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Str('seealso?',
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cli_name='hbacrule',
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label=_('HBAC Rule'),
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doc=_('HBAC Rule that defines the users, groups and hostgroups'),
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),
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StrEnum('usercategory?',
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cli_name='usercat',
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label=_('User category'),
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doc=_('User category the rule applies to'),
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values=(u'all', ),
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),
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StrEnum('hostcategory?',
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cli_name='hostcat',
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label=_('Host category'),
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doc=_('Host category the rule applies to'),
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values=(u'all', ),
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),
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Str('description?',
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cli_name='desc',
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label=_('Description'),
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),
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Flag('ipaenabledflag?',
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label=_('Enabled'),
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flags=['no_create', 'no_update', 'no_search'],
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),
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Str('memberuser_user?',
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label=_('Users'),
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flags=['no_create', 'no_update', 'no_search'],
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),
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Str('memberuser_group?',
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label=_('User Groups'),
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flags=['no_create', 'no_update', 'no_search'],
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),
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Str('memberhost_host?',
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label=_('Hosts'),
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flags=['no_create', 'no_update', 'no_search'],
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),
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Str('memberhost_hostgroup?',
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label=_('Host Groups'),
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flags=['no_create', 'no_update', 'no_search'],
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),
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)
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def _normalize_seealso(self, seealso):
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"""
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Given a HBAC rule name verify its existence and return the dn.
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"""
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if not seealso:
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return None
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try:
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dn = DN(seealso)
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return str(dn)
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except ValueError:
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try:
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(dn, entry_attrs) = self.backend.find_entry_by_attr(
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self.api.Object['hbacrule'].primary_key.name, seealso, self.api.Object['hbacrule'].object_class, [''], self.api.Object['hbacrule'].container_dn)
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seealso = dn
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except errors.NotFound:
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raise errors.NotFound(reason=_('HBAC rule %(rule)s not found') % dict(rule=seealso))
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return seealso
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def _convert_seealso(self, ldap, entry_attrs, **options):
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"""
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Convert an HBAC rule dn into a name
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"""
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if options.get('raw', False):
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return
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if 'seealso' in entry_attrs:
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(hbac_dn, hbac_attrs) = ldap.get_entry(entry_attrs['seealso'][0], ['cn'])
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entry_attrs['seealso'] = hbac_attrs['cn'][0]
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api.register(selinuxusermap)
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class selinuxusermap_add(LDAPCreate):
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__doc__ = _('Create a new SELinux User Map.')
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msg_summary = _('Added SELinux User Map "%(value)s"')
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def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys, **options):
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# rules are enabled by default
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entry_attrs['ipaenabledflag'] = 'TRUE'
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validate_selinuxuser_inlist(ldap, entry_attrs['ipaselinuxuser'])
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if 'seealso' in options:
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entry_attrs['seealso'] = self.obj._normalize_seealso(options['seealso'])
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return dn
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def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
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self.obj._convert_seealso(ldap, entry_attrs, **options)
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return dn
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api.register(selinuxusermap_add)
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class selinuxusermap_del(LDAPDelete):
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__doc__ = _('Delete a SELinux User Map.')
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msg_summary = _('Deleted SELinux User Map "%(value)s"')
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api.register(selinuxusermap_del)
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class selinuxusermap_mod(LDAPUpdate):
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__doc__ = _('Modify a SELinux User Map.')
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msg_summary = _('Modified SELinux User Map "%(value)s"')
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def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys, **options):
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try:
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(_dn, _entry_attrs) = ldap.get_entry(dn, attrs_list)
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except errors.NotFound:
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self.obj.handle_not_found(*keys)
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if 'seealso' in options and ('usercategory' in _entry_attrs or
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'hostcategory' in _entry_attrs or
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'memberuser' in _entry_attrs or
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'memberhost' in _entry_attrs):
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raise errors.MutuallyExclusiveError(reason=notboth_err)
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if is_all(options, 'usercategory') and 'memberuser' in entry_attrs:
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raise errors.MutuallyExclusiveError(reason="user category cannot be set to 'all' while there are allowed users")
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if is_all(options, 'hostcategory') and 'memberhost' in entry_attrs:
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raise errors.MutuallyExclusiveError(reason="host category cannot be set to 'all' while there are allowed hosts")
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if 'ipaselinuxuser' in options:
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validate_selinuxuser_inlist(ldap, options['ipaselinuxuser'])
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if 'seealso' in options:
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entry_attrs['seealso'] = self.obj._normalize_seealso(options['seealso'])
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return dn
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def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
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self.obj._convert_seealso(ldap, entry_attrs, **options)
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return dn
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api.register(selinuxusermap_mod)
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class selinuxusermap_find(LDAPSearch):
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__doc__ = _('Search for SELinux User Maps.')
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msg_summary = ngettext(
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'%(count)d SELinux User Map matched', '%(count)d SELinux User Maps matched', 0
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)
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def execute(self, *args, **options):
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# If searching on hbacrule we need to find the uuid to search on
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if options.get('seealso'):
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hbacrule = options['seealso']
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try:
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hbac = api.Command['hbacrule_show'](hbacrule,
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all=True)['result']
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dn = hbac['dn']
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except errors.NotFound:
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return dict(count=0, result=[], truncated=False)
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options['seealso'] = dn
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return super(selinuxusermap_find, self).execute(*args, **options)
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def post_callback(self, ldap, entries, truncated, *args, **options):
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if options.get('pkey_only', False):
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return
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for entry in entries:
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(dn, attrs) = entry
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self.obj._convert_seealso(ldap, attrs, **options)
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api.register(selinuxusermap_find)
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class selinuxusermap_show(LDAPRetrieve):
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__doc__ = _('Display the properties of a SELinux User Map rule.')
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def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
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self.obj._convert_seealso(ldap, entry_attrs, **options)
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return dn
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api.register(selinuxusermap_show)
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class selinuxusermap_enable(LDAPQuery):
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__doc__ = _('Enable an SELinux User Map rule.')
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msg_summary = _('Enabled SELinux User Map "%(value)s"')
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has_output = output.standard_value
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def execute(self, cn):
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ldap = self.obj.backend
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dn = self.obj.get_dn(cn)
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entry_attrs = {'ipaenabledflag': 'TRUE'}
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try:
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ldap.update_entry(dn, entry_attrs)
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except errors.EmptyModlist:
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raise errors.AlreadyActive()
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except errors.NotFound:
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self.obj.handle_not_found(cn)
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return dict(
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result=True,
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value=cn,
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)
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api.register(selinuxusermap_enable)
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class selinuxusermap_disable(LDAPQuery):
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__doc__ = _('Disable an SELinux User Map rule.')
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msg_summary = _('Disabled SELinux User Map "%(value)s"')
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has_output = output.standard_value
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def execute(self, cn):
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ldap = self.obj.backend
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dn = self.obj.get_dn(cn)
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entry_attrs = {'ipaenabledflag': 'FALSE'}
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try:
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ldap.update_entry(dn, entry_attrs)
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except errors.EmptyModlist:
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raise errors.AlreadyInactive()
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except errors.NotFound:
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self.obj.handle_not_found(cn)
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return dict(
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result=True,
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value=cn,
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)
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api.register(selinuxusermap_disable)
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class selinuxusermap_add_user(LDAPAddMember):
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__doc__ = _('Add users and groups to an SELinux User Map rule.')
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member_attributes = ['memberuser']
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member_count_out = ('%i object added.', '%i objects added.')
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def pre_callback(self, ldap, dn, found, not_found, *keys, **options):
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try:
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(dn, entry_attrs) = ldap.get_entry(dn, self.obj.default_attributes)
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except errors.NotFound:
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self.obj.handle_not_found(*keys)
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if 'usercategory' in entry_attrs and \
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entry_attrs['usercategory'][0].lower() == 'all':
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raise errors.MutuallyExclusiveError(reason="users cannot be added when user category='all'")
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if 'seealso' in entry_attrs:
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raise errors.MutuallyExclusiveError(reason=notboth_err)
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return dn
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api.register(selinuxusermap_add_user)
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class selinuxusermap_remove_user(LDAPRemoveMember):
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__doc__ = _('Remove users and groups from an SELinux User Map rule.')
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member_attributes = ['memberuser']
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member_count_out = ('%i object removed.', '%i objects removed.')
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api.register(selinuxusermap_remove_user)
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class selinuxusermap_add_host(LDAPAddMember):
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__doc__ = _('Add target hosts and hostgroups to an SELinux User Map rule.')
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member_attributes = ['memberhost']
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member_count_out = ('%i object added.', '%i objects added.')
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def pre_callback(self, ldap, dn, found, not_found, *keys, **options):
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try:
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(dn, entry_attrs) = ldap.get_entry(dn, self.obj.default_attributes)
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except errors.NotFound:
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self.obj.handle_not_found(*keys)
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if 'hostcategory' in entry_attrs and \
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entry_attrs['hostcategory'][0].lower() == 'all':
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raise errors.MutuallyExclusiveError(reason="hosts cannot be added when host category='all'")
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if 'seealso' in entry_attrs:
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raise errors.MutuallyExclusiveError(reason=notboth_err)
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return dn
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api.register(selinuxusermap_add_host)
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class selinuxusermap_remove_host(LDAPRemoveMember):
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__doc__ = _('Remove target hosts and hostgroups from an SELinux User Map rule.')
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member_attributes = ['memberhost']
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member_count_out = ('%i object removed.', '%i objects removed.')
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api.register(selinuxusermap_remove_host)
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