summaryrefslogtreecommitdiffstats
path: root/lib/modules/openldap
blob: 219c9a6331810587fd0b9f855e79bfc956873a63 (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
#!/usr/bin/python3

# Manage OpenLDAP databases
# Copyright (c) 2013 Guilhem Moulin <guilhem@fripost.org>
#
# 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/>.

import ldap, ldap.sasl
from ldap.filter  import filter_format
from ldap.dn      import dn2str,explode_dn,str2dn
from ldap.modlist import addModlist
from ldif         import LDIFParser
from functools    import partial
import re, pwd
import tempfile, atexit


# Dirty hack to check equality between the targetted LDIF and that
# currently in the directory.  The value of some configuration (olc*)
# attributes is automatically indexed when added; for those we'll add
# explicit indices to what we find in the LDIF.
indexedAttributes = frozenset([
    'olcAttributeTypes',
    'olcObjectClasses',
    'olcAccess',
    'olcSyncrepl',
    'olcOverlay',
    'olcLimits',
    'olcAuthzRegexp',
    'olcDbConfig',
])


# Another hack. Configuration entries sometimes pollutes the DNs with
# indices, thus it's not possible to directly use them as base.
# Instead, we use their parent as a base, and search for the *unique*
# match with the same ObjectClass and the matching extra attributes.
# ('%s' in the attribute value is replaced with the value of the source
# entry.)
indexedDN = {
    'olcSchemaConfig':  [('cn',             '{*}%s')],
    'olcMdbConfig':     [('olcDbDirectory', '%s'   )],
    'olcOverlayConfig': [('olcOverlay',     '%s'   )],
    'olcMonitorConfig': [],
}

# Allow for flexible ACLs for user using SASL's EXTERNAL mechanism.
# "username=postfix,cn=peercred,cn=external,cn=auth" is replaced by
# "gidNumber=106+uidNumber=102,cn=peercred,cn=external,cn=auth" where
# 102 is postfix's UID and 106 its primary GID.
# (Regular expressions are not allowed.)
sasl_ext_re = re.compile( r"""(?P<start>\sby\s+dn(?:\.exact)?)=
                              (?P<quote>['\"]?)username=(?P<user>_?[a-z][-a-z0-9_]*),
                              (?P<end>cn=peercred,cn=external,cn=auth)
                              (?P=quote)\s"""
                        , re.VERBOSE )
multispaces = re.compile( r"\s+" )
pwd_dict = {}

def acl_sasl_ext(m):
    u = m.group('user')
    if u not in pwd_dict.keys():
        pwd_dict[u] = pwd.getpwnam(u)
    return '%s="gidNumber=%d+uidNumber=%d,%s" ' % ( m.group('start')
                                                  , pwd_dict[u].pw_gid
                                                  , pwd_dict[u].pw_uid
                                                  , m.group('end')
                                                  )


# Run the given callback on each DN seen.  If its return value is not
# None, update the changed variable.
class LDIFCallback(LDIFParser):
    def __init__(self, module, input, callback):
        LDIFParser.__init__(self,input)
        self.callback = callback
        self.changed = False

    def handle(self,dn,entry):
        b = self.callback(dn,entry)
        if b is not None:
            self.changed |= b


# Check if the given dn is already present in the directory.
# Returns None if doesn't exist, and give the dn,entry otherwise
def flexibleSearch(module, l, dn, entry):
    idxClasses = set(entry['objectClass']).intersection(indexedDN.keys())
    if not idxClasses:
        base = dn
        scope = ldap.SCOPE_BASE
        f = 'objectClass=*'
    else:
        # Search on the parent instead, and try to use a precise filter
        dn = str2dn(dn)
        h,t,_ = dn.pop(0)[0]
        base = dn2str(dn)
        scope = ldap.SCOPE_ONELEVEL
        f = []
        for c in idxClasses:
            f.append ( filter_format('objectClass=%s', [c]) )
            for a,v in indexedDN[c]:
                if a == h:
                    v2 = t
                elif a not in entry.keys() or len(entry[a]) > 1:
                    module.fail_json(msg="Multiple values found! This is a bug. Please report.")
                else:
                    v2 = entry[a][0]
                f.append ( filter_format(a+'='+v, [v2]) )
        if len(f) == 1:
            f = f[0]
        else:
            f = '(&(' + ')('.join(f) + '))'

    r = l.search_s( base, scope, filterstr=f )
    if len(r) > 1:
        module.fail_json(msg="Multiple results found! This is a bug. Please report.")
    elif r:
        return r.pop()


# Add or modify (only the attributes that differ from those in the
# directory) the entry for that DN.
# l must be an LDAPObject, and should provide an open connection to the
# directory with disclose/search/write access.
def processEntry(module, l, dn, entry):
    changed = False

    for x in indexedAttributes.intersection(entry.keys()):
        # remove useless extra spaces in ACLs etc
        entry[x] = list(map( partial(multispaces.sub, ' '), entry[x] ))

    r = flexibleSearch( module, l, dn, entry )
    if r is None:
        changed = True
        if module.check_mode:
            module.exit_json(changed=changed, msg="add DN %s" % dn)
        if 'olcAccess' in entry.keys():
            # replace "username=...,cn=peercred,cn=external,cn=auth"
            # by a DN with proper gidNumber and uidNumber
            entry['olcAccess'] = list(map ( partial(sasl_ext_re.sub, acl_sasl_ext)
                                          , entry['olcAccess'] ))
        l.add_s( dn, addModlist(entry) )
    else:
        d,e = r
        fst = str2dn(dn).pop(0)[0][0]
        diff = []
        for a,v in e.iteritems():
            if a not in entry.keys():
                if a != fst:
                    # delete all values except for the first attribute,
                    # which is implicit
                    diff.append(( ldap.MOD_DELETE, a, None ))
            elif a in indexedAttributes:
                if a == 'olcAccess':
                    # replace "username=...,cn=peercred,cn=external,cn=auth"
                    # by a DN with proper gidNumber and uidNumber
                    entry[a] = list(map ( partial(sasl_ext_re.sub, acl_sasl_ext)
                                        , entry[a] ))
                # add explicit indices in the entry from the LDIF
                entry[a] = list(map( (lambda x: '{%d}%s' % x)
                                   , zip(range(len(entry[a])),entry[a])))
                if v != entry[a]:
                    diff.append(( ldap.MOD_REPLACE, a, entry[a] ))
            elif v != entry[a]:
                # for non-indexed attribute, we update values in the
                # symmetric difference only
                s1 = set(v)
                s2 = set(entry[a])
                if s1.isdisjoint(s2):
                    # replace the former values with the new ones
                    diff.append(( ldap.MOD_REPLACE, a, entry[a] ))
                else:
                    x = list(s1.difference(s2))
                    if x:
                        diff.append(( ldap.MOD_DELETE, a, x ))
                    y = list(s2.difference(s1))
                    if y:
                        diff.append(( ldap.MOD_ADD,    a, y ))

        # add attributes that weren't in e
        for a in set(entry).difference(e.keys()):
            diff.append(( ldap.MOD_ADD, a, entry[a] ))

        if diff:
            changed = True
            if module.check_mode:
                module.exit_json(changed=changed, msg="mod DN %s" % dn)
            l.modify_s( d, diff )
    return changed


# Load the given module.
def loadModule(module, l, name):
    changed = False

    f = filter_format( '(&(objectClass=olcModuleList)(olcModuleLoad=%s))', [name] )
    r = l.search_s( 'cn=config', ldap.SCOPE_ONELEVEL, filterstr = f, attrlist = [''] )

    if not r:
        changed = True
        if module.check_mode:
            module.exit_json(changed=changed, msg="add module %s" % name)
        l.modify_s( 'cn=module{0},cn=config'
                  , [(ldap.MOD_ADD, 'olcModuleLoad', name)] )

    return changed


# Find the database associated with a given attribute (eg,
# olcDbDirectory or olcSuffix).
def getDN_DB(module, l, a, v, attrlist=['']):
    f = filter_format( '(&(objectClass=olcDatabaseConfig)('+a+'=%s))', [v] )
    return l.search_s( 'cn=config'
                     , ldap.SCOPE_ONELEVEL
                     , filterstr = f
                     , attrlist = attrlist )


# Convert a *.schema file into *.ldif format. The algorithm can be found
# in /etc/ldap/schema/openldap.ldif .
def slapd_to_ldif(src, name):
    s = open( src, 'r' )
    d = tempfile.NamedTemporaryFile(delete=False)
    atexit.register(lambda: os.unlink( d.name ))

    d.write('dn: cn=%s,cn=schema,cn=config\n' % name)
    d.write('objectClass: olcSchemaConfig\n')

    re1 = re.compile( r'^objectIdentifier\s(.*)', re.I )
    re2 = re.compile( r'^objectClass\s(.*)',      re.I )
    re3 = re.compile( r'^attributeType\s(.*)',    re.I )
    reSp = re.compile( r'^\s+' )
    for line in s.readlines():
        if line == '\n':
            line = '#\n'
        m1 = re1.match(line)
        m2 = re2.match(line)
        m3 = re3.match(line)
        if m1 is not None:
            line = 'olcObjectIdentifier: %s' % m1.group(1)
        elif m2 is not None:
            line = 'olcObjectClasses: %s'    % m2.group(1)
        elif m3 is not None:
            line = 'olcAttributeTypes: %s'   % m3.group(1)

        d.write( reSp.sub(line, '  ') )


    s.close()
    d.close()
    return d.name


def main():
    module = AnsibleModule(
        argument_spec   = dict(
            target      = dict( default=None ),
            module      = dict( default=None ),
            suffix      = dict( default=None ),
            format      = dict( default="ldif", choices=["ldif","slapd.conf"] ),
            name        = dict( default=None ),
            local       = dict( default="no", choices=["no","file","template"] ),
            delete      = dict( default=None ),
        ),
        supports_check_mode=True
    )

    params      = module.params
    target      = params['target']
    mod         = params['module']
    suffix      = params['suffix']
    form        = params['format']
    name        = params['name']
    delete      = params['delete']

    changed = False
    try:
        if delete is not None:
            if name is None:
                module.fail_json(msg="missing name")
            l = ldap.initialize( 'ldapi://' )
            l.sasl_interactive_bind_s('', ldap.sasl.external())
            if delete == 'entry':
                filterStr = '(objectClass=*)'
            else:
                filterStr = [ '(%s=*)' % x for x in delete.split(',') ]
                if len(filterStr) > 1:
                    filterStr = '(|' + ''.join(filterStr) + ')'
                else:
                    filterStr = filterStr[0]

            try:
                r = l.search_s( name, ldap.SCOPE_BASE, filterStr, attrsonly=1 )
            except (ldap.LDAPError, ldap.NO_SUCH_OBJECT):
                r = None

            if r:
                changed = True
                if module.check_mode:
                    module.exit_json(changed=changed)
                if delete == 'entry':
                    l.delete_s(r[0][0])
                else:
                    attrlist = list(set(r[0][1].keys()) & set(delete.split(',')))
                    l.modify_s(r[0][0], [ (ldap.MOD_DELETE, x, None) for x in attrlist ])
            l.unbind_s()

        else:
            if form == 'slapd.conf':
                if name is None:
                    module.fail_json(msg="missing name")
                target = slapd_to_ldif(target, name)

            if target is None and mod is None:
                module.fail_json(msg="missing target or module")
            # bind only once per LDIF file for performance
            l = ldap.initialize( 'ldapi://' )
            l.sasl_interactive_bind_s('', ldap.sasl.external())

            if mod is None:
                callback = partial(processEntry,module,l)
            else:
                changed |= loadModule (module, l, '%s.la' % mod)
                if target is None and suffix is None:
                    l.unbind_s()
                    module.exit_json(changed=changed)
                if target is None or suffix is None:
                    module.fail_json(msg="missing target or suffix")
                r = getDN_DB(module, l, 'olcSuffix', suffix)
                if not r:
                    module.fail_json(msg="No database found for suffix %s" % suffix)
                elif len(r) > 1:
                    module.fail_json(msg="Multiple results found! This is a bug. Please report.")
                else:
                    d = 'olcOverlay=%s,%s' % (mod, r.pop()[0])
                    callback = lambda _,e: processEntry(module,l,d,e)

            parser = LDIFCallback( module, open(target, 'r'), callback )
            parser.parse()
            changed = parser.changed
            l.unbind_s()

    except subprocess.CalledProcessError as e:
        module.fail_json(rv=e.returncode, msg=e.output.rstrip())
    except ldap.LDAPError as e:
        e = e.args[0]
        if 'info' in e.keys():
            msg = e['info']
        elif 'desc' in e.keys():
            msg = e['desc']
        else:
            msg = str(e)
        module.fail_json(msg=msg)
    except KeyError as e:
        module.fail_json(msg=str(e))

    module.exit_json(changed=changed)

# import module snippets
from ansible.module_utils.basic import *

main()