summaryrefslogtreecommitdiffstats
path: root/ipalib/plugins/permission.py
blob: 784b4dae5c79e656ae6469fd2ac7797777d8123e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
# Authors:
#   Rob Crittenden <rcritten@redhat.com>
#
# Copyright (C) 2010  Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
"""
Permissions

A permission enables fine-grained delegation of permissions. Access Control
Rules, or instructions (ACIs), grant permission to permissions to perform
given tasks such as adding a user, modifying a group, etc.

A permission may not be members of other permissions.

* A permissions grants access to read, write, add or delete.
* A privilege combines similar permissions (for example all the permissions
  needed to add a user).
* A role grants a set of privileges to users, groups, hosts or hostgroups.

A permission is made up of a number of different parts:

1. The name of the permission.
2. The target of the permission.
3. The permissions granted by the permission.

The permissions define what operations are allowed and are one or more of:
1. write - write one or more attributes
2. read - read one or more attributes
3. add - add a new entry to the tree
4. delete - delete an existing entry
5. all - all permissions are granted

Read permission is granted for most attributes by default so the read
permission is not expected to be used very often.

Note the distinction between attributes and entries. The permissions are
independent, so being able to add a user does not mean that the user will
be editabe.

There are a number of allowed targets:
1. type: a type of object (user, group, etc).
2. memberof: a member of a group or hostgroup
3. filter: an LDAP filter
4. subtree: an LDAP filter specifying part of the LDAP DIT. This is a
   super-set of the type option.
5. targetgroup: grant access to modify a specific group (such as granting
   the rights to manage group membership)

EXAMPLES:

 Add a permission that grants the creation of users:
   ipa permission-add --type=user --permissions=add "Add Users"

 Add a permission that grants the ability to manage group membership:
   ipa permission-add --attrs=member --permissions=write --type=group "Manage Group Members"
"""

import copy
from ipalib.plugins.baseldap import *
from ipalib import api, _, ngettext
from ipalib import Flag, Str, StrEnum
from ipalib.request import context
from ipalib import errors

ACI_PREFIX=u"permission"

output_params = (
    Str('ipapermissiontype',
        label=_('Permission Type'),
    ),
)

class permission(LDAPObject):
    """
    Permission object.
    """
    container_dn = api.env.container_permission
    object_name = 'permission'
    object_name_plural = 'permissions'
    object_class = ['groupofnames', 'ipapermission']
    default_attributes = ['cn', 'member', 'memberof',
        'memberindirect', 'ipapermissiontype',
    ]
    aci_attributes = ['group', 'permissions', 'attrs', 'type',
        'filter', 'subtree', 'targetgroup',
    ]
    attribute_members = {
        'member': ['privilege'],
    }
    rdnattr='cn'

    label = _('Permissions')

    takes_params = (
        Str('cn',
            cli_name='name',
            label=_('Permission name'),
            primary_key=True,
            normalizer=lambda value: value.lower(),
        ),
        List('permissions',
            cli_name='permissions',
            label=_('Permissions'),
            doc=_('Comma-separated list of permissions to grant ' \
                '(read, write, add, delete, all)'),
        ),
        List('attrs?',
            cli_name='attrs',
            label=_('Attributes'),
            doc=_('Comma-separated list of attributes'),
            normalizer=lambda value: value.lower(),
            flags=('ask_create', 'ask_update'),
        ),
        StrEnum('type?',
            cli_name='type',
            label=_('Type'),
            doc=_('Type of IPA object (user, group, host, hostgroup, service, netgroup, dns)'),
            values=(u'user', u'group', u'host', u'service', u'hostgroup', u'netgroup', u'dnsrecord',),
            flags=('ask_create', 'ask_update'),
        ),
        Str('memberof?',
            cli_name='memberof',
            label=_('Member of group'),  # FIXME: Does this label make sense?
            doc=_('Target members of a group'),
            flags=('ask_create', 'ask_update'),
        ),
        Str('filter?',
            cli_name='filter',
            label=_('Filter'),
            doc=_('Legal LDAP filter (e.g. ou=Engineering)'),
            flags=('ask_create', 'ask_update'),
        ),
        Str('subtree?',
            cli_name='subtree',
            label=_('Subtree'),
            doc=_('Subtree to apply permissions to'),
            flags=('ask_create', 'ask_update'),
        ),
        Str('targetgroup?',
            cli_name='targetgroup',
            label=_('Target group'),
            doc=_('User group to apply permissions to'),
            flags=('ask_create', 'ask_update'),
        ),
    )

    # Don't allow SYSTEM permissions to be modified or removed
    def check_system(self, ldap, dn, *keys):
        try:
            (dn, entry_attrs) = ldap.get_entry(dn, ['ipapermissiontype'])
        except errors.NotFound:
            self.handle_not_found(*keys)
        if 'ipapermissiontype' in entry_attrs:
            if 'SYSTEM' in entry_attrs['ipapermissiontype']:
                return False
        return True

api.register(permission)


class permission_add(LDAPCreate):
    """
    Add a new permission.
    """

    msg_summary = _('Added permission "%(value)s"')

    def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys, **options):
        # Test the ACI before going any further
        opts = copy.copy(options)
        opts['test'] = True
        opts['permission'] = keys[-1]
        opts['aciprefix'] = ACI_PREFIX
        try:
            self.api.Command.aci_add(keys[-1], **opts)
        except Exception, e:
            raise e

        # Clear the aci attributes out of the permission entry
        for o in options:
            try:
                if o not in ['objectclass']:
                    del entry_attrs[o]
            except:
                pass
        return dn

    def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
        # Now actually add the aci.
        opts = copy.copy(options)
        opts['test'] = False
        opts['permission'] = keys[-1]
        opts['aciprefix'] = ACI_PREFIX
        try:
            result = self.api.Command.aci_add(keys[-1], **opts)['result']
            for attr in self.obj.aci_attributes:
                if attr in result:
                    entry_attrs[attr] = result[attr]
        except errors.InvalidSyntax, e:
            # A syntax error slipped past our attempt at validation, clean up
            self.api.Command.permission_del(keys[-1])
            raise e
        except Exception, e:
            # Something bad happened, clean up as much as we can and return
            # that error
            try:
                self.api.Command.permission_del(keys[-1])
            except Exception, ignore:
                pass
            try:
                self.api.Command.aci_del(keys[-1], aciprefix=ACI_PREFIX)
            except Exception, ignore:
                pass
            raise e
        return dn

api.register(permission_add)


class permission_del(LDAPDelete):
    """
    Delete a permission.
    """

    msg_summary = _('Deleted permission "%(value)s"')

    def pre_callback(self, ldap, dn, *keys, **options):
        if not self.obj.check_system(ldap, dn, *keys):
            raise errors.ACIError(info='A SYSTEM permission may not be removed')
        # remove permission even when the underlying ACI is missing
        try:
            self.api.Command.aci_del(keys[-1], aciprefix=ACI_PREFIX)
        except errors.NotFound:
            pass
        return dn

api.register(permission_del)


class permission_mod(LDAPUpdate):
    """
    Modify a permission.
    """

    msg_summary = _('Modified permission "%(value)s"')
    has_output_params = LDAPUpdate.has_output_params + output_params

    def pre_callback(self, ldap, dn, entry_attrs, attrs_list, *keys, **options):
        if not self.obj.check_system(ldap, dn, *keys):
            raise errors.ACIError(info='A SYSTEM permission may not be modified')

        # check if permission is in LDAP
        try:
            (dn, attrs) = ldap.get_entry(
                dn, attrs_list, normalize=self.obj.normalize_dn
            )
        except errors.NotFound:
            self.obj.handle_not_found(*keys)

        # when renaming permission, check if the target permission does not
        # exists already. Then, make changes to underlying ACI
        if 'rename' in options:
            try:
                new_dn = dn.replace(keys[-1], options['rename'], 1)
                (new_dn, attrs) = ldap.get_entry(
                    new_dn, attrs_list, normalize=self.obj.normalize_dn
                )
                raise errors.DuplicateEntry()
            except errors.NotFound:
                pass    # permission may be renamed, continue

        opts = copy.copy(options)
        for o in ['all', 'raw', 'rights', 'rename']:
            if o in opts:
                del opts[o]
        setattr(context, 'aciupdate', False)
        # If there are no options left we don't need to do anything to the
        # underlying ACI.
        if len(opts) > 0:
            opts['test'] = False
            opts['permission'] = keys[-1]
            opts['aciprefix'] = ACI_PREFIX
            try:
                self.api.Command.aci_mod(keys[-1], **opts)
                setattr(context, 'aciupdate', True)
            except Exception, e:
                raise e

        # Clear the aci attributes out of the permission entry
        for o in self.obj.aci_attributes:
            try:
                del entry_attrs[o]
            except:
                pass

        return dn

    def exc_callback(self, keys, options, exc, call_func, *call_args, **call_kwargs):
        if isinstance(exc, errors.EmptyModlist):
            aciupdate = getattr(context, 'aciupdate')
            opts = copy.copy(options)
            # Clear the aci attributes out of the permission entry
            for o in self.obj.aci_attributes + ['all', 'raw', 'rights']:
                try:
                    del opts[o]
                except:
                    pass

            if len(opts) > 0 and not aciupdate:
                raise exc
        else:
            raise exc

    def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
        # rename the underlying ACI after the change to permission
        cn = keys[-1]

        if 'rename' in options:
            self.api.Command.aci_mod(cn,aciprefix=ACI_PREFIX,
                        permission=options['rename'])

            self.api.Command.aci_rename(cn, aciprefix=ACI_PREFIX,
                        newname=options['rename'], newprefix=ACI_PREFIX)

            cn = options['rename']     # rename finished

        result = self.api.Command.permission_show(cn)['result']
        for r in result:
            if not r.startswith('member'):
                entry_attrs[r] = result[r]
        return dn

api.register(permission_mod)


class permission_find(LDAPSearch):
    """
    Search for permissions.
    """

    msg_summary = ngettext(
        '%(count)d permission matched', '%(count)d permissions matched'
    )
    has_output_params = LDAPSearch.has_output_params + output_params

    def post_callback(self, ldap, entries, truncated, *args, **options):
        for entry in entries:
            (dn, attrs) = entry
            try:
                aci = self.api.Command.aci_show(attrs['cn'][0], aciprefix=ACI_PREFIX)['result']

                # copy information from respective ACI to permission entry
                for attr in self.obj.aci_attributes:
                    if attr in aci:
                        attrs[attr] = aci[attr]
            except errors.NotFound:
                self.debug('ACI not found for %s' % attrs['cn'][0])

        # Now find all the ACIs that match. Once we find them, add any that
        # aren't already in the list along with their permission info.
        options['aciprefix'] = ACI_PREFIX

        aciresults = self.api.Command.aci_find(*args, **options)
        truncated = truncated or aciresults['truncated']
        results = aciresults['result']

        for aci in results:
            found = False
            if 'permission' in aci:
                for entry in entries:
                    (dn, attrs) = entry
                    if aci['permission'] == attrs['cn'][0]:
                        found = True
                        break
                if not found:
                    permission = self.api.Command.permission_show(aci['permission'])
                    attrs = permission['result']
                    for attr in self.obj.aci_attributes:
                        if attr in aci:
                            attrs[attr] = aci[attr]
                    dn = attrs['dn']
                    del attrs['dn']
                    if (dn, attrs) not in entries:
                        entries.append((dn, attrs))

api.register(permission_find)


class permission_show(LDAPRetrieve):
    """
    Display information about a permission.
    """
    has_output_params = LDAPRetrieve.has_output_params + output_params
    def post_callback(self, ldap, dn, entry_attrs, *keys, **options):
        try:
            aci = self.api.Command.aci_show(keys[-1], aciprefix=ACI_PREFIX)['result']
            for attr in self.obj.aci_attributes:
                if attr in aci:
                    entry_attrs[attr] = aci[attr]
        except errors.NotFound:
            self.debug('ACI not found for %s' % entry_attrs['cn'][0])
        return dn

api.register(permission_show)


class permission_add_member(LDAPAddMember):
    """
    Add members to a permission.
    """
    NO_CLI = True

api.register(permission_add_member)


class permission_remove_member(LDAPRemoveMember):
    """
    Remove members from a permission.
    """
    NO_CLI = True

api.register(permission_remove_member)