1 /* group.c - group lookup routines */
2 /* $OpenLDAP$ */
3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
4 *
5 * Copyright 2008-2021 The OpenLDAP Foundation.
6 * Portions Copyright 2008-2009 by Howard Chu, Symas Corp.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted only as authorized by the OpenLDAP
11 * Public License.
12 *
13 * A copy of this license is available in the file LICENSE in the
14 * top-level directory of the distribution or, alternatively, at
15 * <http://www.OpenLDAP.org/license.html>.
16 */
17 /* ACKNOWLEDGEMENTS:
18 * This code references portions of the nss-ldapd package
19 * written by Arthur de Jong. The nss-ldapd code was forked
20 * from the nss-ldap library written by Luke Howard.
21 */
22
23 #include "nssov.h"
24
25 /* for gid_t */
26 #include <grp.h>
27
28 /* ( nisSchema.2.2 NAME 'posixGroup' SUP top STRUCTURAL
29 * DESC 'Abstraction of a group of accounts'
30 * MUST ( cn $ gidNumber )
31 * MAY ( userPassword $ memberUid $ description ) )
32 *
33 * apart from that the above the uniqueMember attributes may be
34 * supported in a coming release (they map to DNs, which is an extra
35 * lookup step)
36 *
37 * using nested groups (groups that are member of a group) is currently
38 * not supported, this may be added in a later release
39 */
40
41 /* the basic search filter for searches */
42 static struct berval group_filter = BER_BVC("(objectClass=posixGroup)");
43
44 /* the attributes to request with searches */
45 static struct berval group_keys[] = {
46 BER_BVC("cn"),
47 BER_BVC("userPassword"),
48 BER_BVC("gidNumber"),
49 BER_BVC("memberUid"),
50 BER_BVC("uniqueMember"),
51 BER_BVNULL
52 };
53
54 #define CN_KEY 0
55 #define PWD_KEY 1
56 #define GID_KEY 2
57 #define UID_KEY 3
58 #define MEM_KEY 4
59
60 /* default values for attributes */
61 static struct berval default_group_userPassword = BER_BVC("*"); /* unmatchable */
62
63 NSSOV_CBPRIV(group,
64 nssov_info *ni;
65 char buf[256];
66 struct berval name;
67 struct berval gidnum;
68 struct berval user;
69 int wantmembers;);
70
71 /* create a search filter for searching a group entry
72 by member uid, return -1 on errors */
mkfilter_group_bymember(nssov_group_cbp * cbp,struct berval * buf)73 static int mkfilter_group_bymember(nssov_group_cbp *cbp,struct berval *buf)
74 {
75 struct berval dn;
76 /* try to translate uid to DN */
77 nssov_uid2dn(cbp->op,cbp->ni,&cbp->user,&dn);
78 if (BER_BVISNULL(&dn)) {
79 if (cbp->user.bv_len + cbp->mi->mi_filter.bv_len + cbp->mi->mi_attrs[UID_KEY].an_desc->ad_cname.bv_len + 6 >
80 buf->bv_len )
81 return -1;
82 buf->bv_len = snprintf(buf->bv_val, buf->bv_len, "(&%s(%s=%s))",
83 cbp->mi->mi_filter.bv_val, cbp->mi->mi_attrs[UID_KEY].an_desc->ad_cname.bv_val,
84 cbp->user.bv_val );
85 } else { /* also lookup using user DN */
86 if (cbp->user.bv_len + cbp->mi->mi_filter.bv_len + cbp->mi->mi_attrs[UID_KEY].an_desc->ad_cname.bv_len +
87 dn.bv_len + cbp->mi->mi_attrs[MEM_KEY].an_desc->ad_cname.bv_len + 12 > buf->bv_len )
88 return -1;
89 buf->bv_len = snprintf(buf->bv_val, buf->bv_len, "(&%s(|(%s=%s)(%s=%s)))",
90 cbp->mi->mi_filter.bv_val,
91 cbp->mi->mi_attrs[UID_KEY].an_desc->ad_cname.bv_val, cbp->user.bv_val,
92 cbp->mi->mi_attrs[MEM_KEY].an_desc->ad_cname.bv_val, dn.bv_val );
93 }
94 return 0;
95 }
96
NSSOV_INIT(group)97 NSSOV_INIT(group)
98
99 /*
100 Checks to see if the specified name is a valid group name.
101
102 This test is based on the definition from POSIX (IEEE Std 1003.1, 2004,
103 3.189 Group Name and 3.276 Portable Filename Character Set):
104 http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap03.html#tag_03_189
105 http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap03.html#tag_03_276
106
107 The standard defines group names valid if they only contain characters from
108 the set [A-Za-z0-9._-] where the hyphen should not be used as first
109 character.
110 */
111 static int isvalidgroupname(struct berval *name)
112 {
113 int i;
114
115 if ( !name->bv_val || !name->bv_len )
116 return 0;
117 /* check first character */
118 if ( ! ( (name->bv_val[0]>='A' && name->bv_val[0] <= 'Z') ||
119 (name->bv_val[0]>='a' && name->bv_val[0] <= 'z') ||
120 (name->bv_val[0]>='0' && name->bv_val[0] <= '9') ||
121 name->bv_val[0]=='.' || name->bv_val[0]=='_' ) )
122 return 0;
123 /* check other characters */
124 for (i=1;i<name->bv_len;i++)
125 {
126 #ifndef STRICT_GROUPS
127 /* allow spaces too */
128 if (name->bv_val[i] == ' ') continue;
129 #endif
130 if ( ! ( (name->bv_val[i]>='A' && name->bv_val[i] <= 'Z') ||
131 (name->bv_val[i]>='a' && name->bv_val[i] <= 'z') ||
132 (name->bv_val[i]>='0' && name->bv_val[i] <= '9') ||
133 name->bv_val[i]=='.' || name->bv_val[i]=='_' || name->bv_val[i]=='-') )
134 return 0;
135 }
136 /* no test failed so it must be good */
137 return -1;
138 }
139
write_group(nssov_group_cbp * cbp,Entry * entry)140 static int write_group(nssov_group_cbp *cbp,Entry *entry)
141 {
142 struct berval tmparr[2], tmpgid[2];
143 struct berval *names,*gids,*members;
144 struct berval passwd = {0};
145 Attribute *a;
146 int i,j,nummembers,rc = 0;
147
148 /* get group name (cn) */
149 if (BER_BVISNULL(&cbp->name))
150 {
151 a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[CN_KEY].an_desc);
152 if ( !a )
153 {
154 Debug(LDAP_DEBUG_ANY,"group entry %s does not contain %s value\n",
155 entry->e_name.bv_val, cbp->mi->mi_attrs[CN_KEY].an_desc->ad_cname.bv_val,0);
156 return 0;
157 }
158 names = a->a_vals;
159 }
160 else
161 {
162 names=tmparr;
163 names[0]=cbp->name;
164 BER_BVZERO(&names[1]);
165 }
166 /* get the group id(s) */
167 if (BER_BVISNULL(&cbp->gidnum))
168 {
169 a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[GID_KEY].an_desc);
170 if ( !a )
171 {
172 Debug(LDAP_DEBUG_ANY,"group entry %s does not contain %s value\n",
173 entry->e_name.bv_val, cbp->mi->mi_attrs[GID_KEY].an_desc->ad_cname.bv_val,0);
174 return 0;
175 }
176 gids = a->a_vals;
177 }
178 else
179 {
180 gids=tmpgid;
181 gids[0]=cbp->gidnum;
182 BER_BVZERO(&gids[1]);
183 }
184 /* get group passwd (userPassword) (use only first entry) */
185 a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[PWD_KEY].an_desc);
186 if (a)
187 get_userpassword(&a->a_vals[0], &passwd);
188 if (BER_BVISNULL(&passwd))
189 passwd=default_group_userPassword;
190 /* get group members (memberUid&uniqueMember) */
191 if (cbp->wantmembers) {
192 Attribute *b;
193 i = 0; j = 0;
194 a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[UID_KEY].an_desc);
195 b = attr_find(entry->e_attrs, cbp->mi->mi_attrs[MEM_KEY].an_desc);
196 if ( a )
197 i += a->a_numvals;
198 if ( b )
199 i += b->a_numvals;
200 if ( i ) {
201 members = cbp->op->o_tmpalloc( (i+1) * sizeof(struct berval), cbp->op->o_tmpmemctx );
202
203 if ( a ) {
204 for (i=0; i<a->a_numvals; i++) {
205 if (isvalidusername(&a->a_vals[i])) {
206 ber_dupbv_x(&members[j],&a->a_vals[i],cbp->op->o_tmpmemctx);
207 j++;
208 }
209 }
210 }
211 a = b;
212 if ( a ) {
213 for (i=0; i<a->a_numvals; i++) {
214 if (nssov_dn2uid(cbp->op,cbp->ni,&a->a_nvals[i],&members[j]))
215 j++;
216 }
217 }
218 nummembers = j;
219 BER_BVZERO(&members[j]);
220 } else {
221 members=NULL;
222 nummembers = 0;
223 }
224
225 } else {
226 members=NULL;
227 nummembers = 0;
228 }
229 /* write entries for all names and gids */
230 for (i=0;!BER_BVISNULL(&names[i]);i++)
231 {
232 if (!isvalidgroupname(&names[i]))
233 {
234 Debug(LDAP_DEBUG_ANY,"nssov: group entry %s contains invalid group name: \"%s\"\n",
235 entry->e_name.bv_val,names[i].bv_val,0);
236 }
237 else
238 {
239 for (j=0;!BER_BVISNULL(&gids[j]);j++)
240 {
241 char *tmp;
242 int tmpint32;
243 gid_t gid;
244 gid = strtol(gids[j].bv_val, &tmp, 0);
245 if ( *tmp ) {
246 Debug(LDAP_DEBUG_ANY,"nssov: group entry %s contains non-numeric %s value: \"%s\"\n",
247 entry->e_name.bv_val, cbp->mi->mi_attrs[GID_KEY].an_desc->ad_cname.bv_val,
248 names[i].bv_val);
249 continue;
250 }
251 WRITE_INT32(cbp->fp,NSLCD_RESULT_BEGIN);
252 WRITE_BERVAL(cbp->fp,&names[i]);
253 WRITE_BERVAL(cbp->fp,&passwd);
254 WRITE_INT32(cbp->fp,gid);
255 /* write a list of values */
256 WRITE_INT32(cbp->fp,nummembers);
257 if (nummembers)
258 {
259 int k;
260 for (k=0;k<nummembers;k++) {
261 WRITE_BERVAL(cbp->fp,&members[k]);
262 }
263 }
264 }
265 }
266 }
267 /* free and return */
268 if (members!=NULL)
269 ber_bvarray_free_x( members, cbp->op->o_tmpmemctx );
270 return rc;
271 }
272
273 NSSOV_CB(group)
274
275 NSSOV_HANDLE(
276 group,byname,
277 char fbuf[1024];
278 struct berval filter = {sizeof(fbuf)};
279 filter.bv_val = fbuf;
280 READ_STRING(fp,cbp.buf);
281 cbp.name.bv_len = tmpint32;
282 cbp.name.bv_val = cbp.buf;
283 if (!isvalidgroupname(&cbp.name)) {
284 Debug(LDAP_DEBUG_ANY,"nssov_group_byname(%s): invalid group name\n",cbp.name.bv_val,0,0);
285 return -1;
286 }
287 cbp.wantmembers = 1;
288 cbp.ni = ni;
289 BER_BVZERO(&cbp.gidnum);
290 BER_BVZERO(&cbp.user);,
291 Debug(LDAP_DEBUG_TRACE,"nslcd_group_byname(%s)\n",cbp.name.bv_val,0,0);,
292 NSLCD_ACTION_GROUP_BYNAME,
293 nssov_filter_byname(cbp.mi,CN_KEY,&cbp.name,&filter)
294 )
295
296 NSSOV_HANDLE(
297 group,bygid,
298 gid_t gid;
299 char fbuf[1024];
300 struct berval filter = {sizeof(fbuf)};
301 filter.bv_val = fbuf;
302 READ_INT32(fp,gid);
303 cbp.gidnum.bv_val = cbp.buf;
304 cbp.gidnum.bv_len = snprintf(cbp.buf,sizeof(cbp.buf),"%d",gid);
305 cbp.wantmembers = 1;
306 cbp.ni = ni;
307 BER_BVZERO(&cbp.name);
308 BER_BVZERO(&cbp.user);,
309 Debug(LDAP_DEBUG_TRACE,"nssov_group_bygid(%s)\n",cbp.gidnum.bv_val,0,0);,
310 NSLCD_ACTION_GROUP_BYGID,
311 nssov_filter_byid(cbp.mi,GID_KEY,&cbp.gidnum,&filter)
312 )
313
314 NSSOV_HANDLE(
315 group,bymember,
316 char fbuf[1024];
317 struct berval filter = {sizeof(fbuf)};
318 filter.bv_val = fbuf;
319 READ_STRING(fp,cbp.buf);
320 cbp.user.bv_len = tmpint32;
321 cbp.user.bv_val = cbp.buf;
322 if (!isvalidusername(&cbp.user)) {
323 Debug(LDAP_DEBUG_ANY,"nssov_group_bymember(%s): invalid user name\n",cbp.user.bv_val,0,0);
324 return -1;
325 }
326 cbp.wantmembers = 0;
327 cbp.ni = ni;
328 BER_BVZERO(&cbp.name);
329 BER_BVZERO(&cbp.gidnum);,
330 Debug(LDAP_DEBUG_TRACE,"nssov_group_bymember(%s)\n",cbp.user.bv_val,0,0);,
331 NSLCD_ACTION_GROUP_BYMEMBER,
332 mkfilter_group_bymember(&cbp,&filter)
333 )
334
335 NSSOV_HANDLE(
336 group,all,
337 struct berval filter;
338 /* no parameters to read */
339 cbp.wantmembers = 1;
340 cbp.ni = ni;
341 BER_BVZERO(&cbp.name);
342 BER_BVZERO(&cbp.gidnum);,
343 Debug(LDAP_DEBUG_TRACE,"nssov_group_all()\n",0,0,0);,
344 NSLCD_ACTION_GROUP_ALL,
345 (filter=cbp.mi->mi_filter,0)
346 )
347