git.sur5r.net Git - openldap/blob - contrib/slapd-modules/nssov/group.c

   1 /* group.c - group lookup routines */
   2 /* $OpenLDAP$ */
   3 /*
   4  * Copyright 2008 by Howard Chu, Symas Corp.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted only as authorized by the OpenLDAP
   9  * Public License.
  10  *
  11  * A copy of this license is available in the file LICENSE in the
  12  * top-level directory of the distribution or, alternatively, at
  13  * <http://www.OpenLDAP.org/license.html>.
  14  */
  15 /*
  16  * This code references portions of the nss-ldapd package
  17  * written by Arthur de Jong. The nss-ldapd code was forked
  18  * from the nss-ldap library written by Luke Howard.
  19  */
  20
  21 #include "nssov.h"
  22
  23 /* for gid_t */
  24 #include <grp.h>
  25
  26 /* ( nisSchema.2.2 NAME 'posixGroup' SUP top STRUCTURAL
  27  *   DESC 'Abstraction of a group of accounts'
  28  *   MUST ( cn $ gidNumber )
  29  *   MAY ( userPassword $ memberUid $ description ) )
  30  *
  31  * apart from that the above the uniqueMember attributes may be
  32  * supported in a coming release (they map to DNs, which is an extra
  33  * lookup step)
  34  *
  35  * using nested groups (groups that are member of a group) is currently
  36  * not supported, this may be added in a later release
  37  */
  38
  39 /* the basic search filter for searches */
  40 static struct berval group_filter = BER_BVC("(objectClass=posixGroup)");
  41
  42 /* the attributes to request with searches */
  43 static struct berval group_keys[] = {
  44         BER_BVC("cn"),
  45         BER_BVC("userPassword"),
  46         BER_BVC("gidNumber"),
  47         BER_BVC("memberUid"),
  48         BER_BVC("uniqueMember"),
  49         BER_BVNULL
  50 };
  51
  52 #define CN_KEY  0
  53 #define PWD_KEY 1
  54 #define GID_KEY 2
  55 #define UID_KEY 3
  56 #define MEM_KEY 4
  57
  58 /* default values for attributes */
  59 static struct berval default_group_userPassword     = BER_BVC("*"); /* unmatchable */
  60
  61 NSSOV_CBPRIV(group,
  62         nssov_info *ni;
  63         char buf[256];
  64         struct berval name;
  65         struct berval gidnum;
  66         struct berval user;
  67         int wantmembers;);
  68
  69 /* create a search filter for searching a group entry
  70          by member uid, return -1 on errors */
  71 static int mkfilter_group_bymember(nssov_group_cbp *cbp,struct berval *buf)
  72 {
  73         struct berval dn;
  74         /* try to translate uid to DN */
  75         nssov_uid2dn(cbp->op,cbp->ni,&cbp->user,&dn);
  76         if (BER_BVISNULL(&dn)) {
  77                 if (cbp->user.bv_len + cbp->mi->mi_filter.bv_len + cbp->mi->mi_attrs[UID_KEY].an_desc->ad_cname.bv_len + 6 >
  78                         buf->bv_len )
  79                         return -1;
  80                 buf->bv_len = snprintf(buf->bv_val, buf->bv_len, "(&%s(%s=%s))",
  81                         cbp->mi->mi_filter.bv_val, cbp->mi->mi_attrs[UID_KEY].an_desc->ad_cname.bv_val,
  82                         cbp->user.bv_val );
  83         } else { /* also lookup using user DN */
  84                 if (cbp->user.bv_len + cbp->mi->mi_filter.bv_len + cbp->mi->mi_attrs[UID_KEY].an_desc->ad_cname.bv_len +
  85                         dn.bv_len + cbp->mi->mi_attrs[MEM_KEY].an_desc->ad_cname.bv_len + 12 > buf->bv_len )
  86                         return -1;
  87                 buf->bv_len = snprintf(buf->bv_val, buf->bv_len, "(&%s(|(%s=%s)(%s=%s)))",
  88                         cbp->mi->mi_filter.bv_val,
  89                         cbp->mi->mi_attrs[UID_KEY].an_desc->ad_cname.bv_val, cbp->user.bv_val,
  90                         cbp->mi->mi_attrs[MEM_KEY].an_desc->ad_cname.bv_val, dn.bv_val );
  91         }
  92         return 0;
  93 }
  94
  95 NSSOV_INIT(group)
  96
  97 /*
  98          Checks to see if the specified name is a valid group name.
  99
 100          This test is based on the definition from POSIX (IEEE Std 1003.1, 2004,
 101          3.189 Group Name and 3.276 Portable Filename Character Set):
 102          http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap03.html#tag_03_189
 103          http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap03.html#tag_03_276
 104
 105          The standard defines group names valid if they only contain characters from
 106          the set [A-Za-z0-9._-] where the hyphen should not be used as first
 107          character.
 108 */
 109 static int isvalidgroupname(struct berval *name)
 110 {
 111         int i;
 112
 113         if ( !name->bv_val || !name->bv_len )
 114                 return 0;
 115         /* check first character */
 116         if ( ! ( (name->bv_val[0]>='A' && name->bv_val[0] <= 'Z') ||
 117                                          (name->bv_val[0]>='a' && name->bv_val[0] <= 'z') ||
 118                                          (name->bv_val[0]>='0' && name->bv_val[0] <= '9') ||
 119                                          name->bv_val[0]=='.' || name->bv_val[0]=='_' ) )
 120                 return 0;
 121         /* check other characters */
 122         for (i=1;i<name->bv_len;i++)
 123         {
 124                 if ( ! ( (name->bv_val[i]>='A' && name->bv_val[i] <= 'Z') ||
 125                                                  (name->bv_val[i]>='a' && name->bv_val[i] <= 'z') ||
 126                                                  (name->bv_val[i]>='0' && name->bv_val[i] <= '9') ||
 127                                                  name->bv_val[i]=='.' || name->bv_val[i]=='_' || name->bv_val[i]=='-') )
 128                         return 0;
 129         }
 130         /* no test failed so it must be good */
 131         return -1;
 132 }
 133
 134 static int write_group(nssov_group_cbp *cbp,Entry *entry)
 135 {
 136         struct berval tmparr[2], tmpgid[2];
 137         struct berval *names,*gids,*members;
 138         struct berval passwd = {0};
 139         Attribute *a;
 140         int i,j,nummembers,rc;
 141
 142         /* get group name (cn) */
 143         if (BER_BVISNULL(&cbp->name))
 144         {
 145                 a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[CN_KEY].an_desc);
 146                 if ( !a )
 147                 {
 148                         Debug(LDAP_DEBUG_ANY,"group entry %s does not contain %s value",
 149                                         entry->e_name.bv_val, cbp->mi->mi_attrs[CN_KEY].an_desc->ad_cname.bv_val,0);
 150                         return 0;
 151                 }
 152                 names = a->a_vals;
 153         }
 154         else
 155         {
 156                 names=tmparr;
 157                 names[0]=cbp->name;
 158                 BER_BVZERO(&names[1]);
 159         }
 160         /* get the group id(s) */
 161         if (BER_BVISNULL(&cbp->gidnum))
 162         {
 163                 a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[GID_KEY].an_desc);
 164                 if ( !a )
 165                 {
 166                         Debug(LDAP_DEBUG_ANY,"group entry %s does not contain %s value",
 167                                         entry->e_name.bv_val, cbp->mi->mi_attrs[GID_KEY].an_desc->ad_cname.bv_val,0);
 168                         return 0;
 169                 }
 170                 gids = a->a_vals;
 171         }
 172         else
 173         {
 174                 gids=tmpgid;
 175                 gids[0]=cbp->gidnum;
 176                 BER_BVZERO(&gids[1]);
 177         }
 178         /* get group passwd (userPassword) (use only first entry) */
 179         a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[PWD_KEY].an_desc);
 180         if (a)
 181                 get_userpassword(&a->a_vals[0], &passwd);
 182         if (BER_BVISNULL(&passwd))
 183                 passwd=default_group_userPassword;
 184         /* get group members (memberUid&uniqueMember) */
 185         if (cbp->wantmembers) {
 186                 Attribute *b;
 187                 i = 0; j = 0;
 188                 a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[UID_KEY].an_desc);
 189                 b = attr_find(entry->e_attrs, cbp->mi->mi_attrs[MEM_KEY].an_desc);
 190                 if ( a )
 191                         i += a->a_numvals;
 192                 if ( b )
 193                         i += b->a_numvals;
 194                 if ( i )
 195                         members = cbp->op->o_tmpalloc( (i+1) * sizeof(struct berval), cbp->op->o_tmpmemctx );
 196
 197                 if ( a ) {
 198                         for (i=0; i<a->a_numvals; i++) {
 199                                 if (isvalidusername(&a->a_vals[i])) {
 200                                         ber_dupbv_x(&members[j],&a->a_vals[i],cbp->op->o_tmpmemctx);
 201                                         j++;
 202                                 }
 203                         }
 204                 }
 205                 a = b;
 206                 if ( a ) {
 207                         for (i=0; i<a->a_numvals; i++) {
 208                                 if (nssov_dn2uid(cbp->op,cbp->ni,&a->a_nvals[i],&members[j]))
 209                                         j++;
 210                         }
 211                 }
 212                 nummembers = j;
 213                 BER_BVZERO(&members[j]);
 214         } else {
 215                 members=NULL;
 216                 nummembers = 0;
 217         }
 218         /* write entries for all names and gids */
 219         for (i=0;!BER_BVISNULL(&names[i]);i++)
 220         {
 221                 if (!isvalidgroupname(&names[i]))
 222                 {
 223                         Debug(LDAP_DEBUG_ANY,"nssov: group entry %s contains invalid group name: \"%s\"",
 224                                                                                                         entry->e_name.bv_val,names[i].bv_val,0);
 225                 }
 226                 else
 227                 {
 228                         for (j=0;!BER_BVISNULL(&gids[j]);j++)
 229                         {
 230                                 char *tmp;
 231                                 int tmpint32;
 232                                 gid_t gid;
 233                                 gid = strtol(gids[j].bv_val, &tmp, 0);
 234                                 if ( *tmp ) {
 235                                         Debug(LDAP_DEBUG_ANY,"nssov: group entry %s contains non-numeric %s value: \"%s\"",
 236                                                 entry->e_name.bv_val, cbp->mi->mi_attrs[GID_KEY].an_desc->ad_cname.bv_val,
 237                                                 names[i].bv_val);
 238                                         continue;
 239                                 }
 240                                 WRITE_INT32(cbp->fp,NSLCD_RESULT_SUCCESS);
 241                                 WRITE_BERVAL(cbp->fp,&names[i]);
 242                                 WRITE_BERVAL(cbp->fp,&passwd);
 243                                 WRITE_TYPE(cbp->fp,gid,gid_t);
 244                                 /* write a list of values */
 245                                 WRITE_INT32(cbp->fp,nummembers);
 246                                 if (nummembers)
 247                                 {
 248                                         int k;
 249                                         for (k=0;k<nummembers;k++) {
 250                                                 WRITE_BERVAL(cbp->fp,&members[k]);
 251                                         }
 252                                 }
 253                         }
 254                 }
 255         }
 256         /* free and return */
 257         if (members!=NULL)
 258                 ber_bvarray_free_x( members, cbp->op->o_tmpmemctx );
 259         return rc;
 260 }
 261
 262 NSSOV_CB(group)
 263
 264 NSSOV_HANDLE(
 265         group,byname,
 266         char fbuf[1024];
 267         struct berval filter = {sizeof(fbuf)};
 268         filter.bv_val = fbuf;
 269         READ_STRING_BUF2(fp,cbp.buf,sizeof(cbp.buf));
 270         cbp.name.bv_len = tmpint32;
 271         cbp.name.bv_val = cbp.buf;
 272         if (!isvalidgroupname(&cbp.name)) {
 273                 Debug(LDAP_DEBUG_ANY,"nssov_group_byname(%s): invalid group name",cbp.name.bv_val,0,0);
 274                 return -1;
 275         }
 276         cbp.wantmembers = 1;
 277         cbp.ni = ni;
 278         BER_BVZERO(&cbp.gidnum);
 279         BER_BVZERO(&cbp.user);,
 280         Debug(LDAP_DEBUG_TRACE,"nslcd_group_byname(%s)",cbp.name.bv_val,0,0);,
 281         NSLCD_ACTION_GROUP_BYNAME,
 282         nssov_filter_byname(cbp.mi,CN_KEY,&cbp.name,&filter)
 283 )
 284
 285 NSSOV_HANDLE(
 286         group,bygid,
 287         gid_t gid;
 288         char fbuf[1024];
 289         struct berval filter = {sizeof(fbuf)};
 290         filter.bv_val = fbuf;
 291         READ_TYPE(fp,gid,gid_t);
 292         cbp.gidnum.bv_val = cbp.buf;
 293         cbp.gidnum.bv_len = snprintf(cbp.buf,sizeof(cbp.buf),"%d",gid);
 294         cbp.wantmembers = 1;
 295         cbp.ni = ni;
 296         BER_BVZERO(&cbp.name);
 297         BER_BVZERO(&cbp.user);,
 298         Debug(LDAP_DEBUG_TRACE,"nssov_group_bygid(%s)",cbp.gidnum.bv_val,0,0);,
 299         NSLCD_ACTION_GROUP_BYGID,
 300         nssov_filter_byid(cbp.mi,GID_KEY,&cbp.gidnum,&filter)
 301 )
 302
 303 NSSOV_HANDLE(
 304         group,bymember,
 305         char fbuf[1024];
 306         struct berval filter = {sizeof(fbuf)};
 307         filter.bv_val = fbuf;
 308         READ_STRING_BUF2(fp,cbp.buf,sizeof(cbp.buf));
 309         cbp.user.bv_len = tmpint32;
 310         cbp.user.bv_val = cbp.buf;
 311         if (!isvalidusername(&cbp.user)) {
 312                 Debug(LDAP_DEBUG_ANY,"nssov_group_bymember(%s): invalid user name",cbp.user.bv_val,0,0);
 313                 return -1;
 314         }
 315         cbp.wantmembers = 0;
 316         cbp.ni = ni;
 317         BER_BVZERO(&cbp.name);
 318         BER_BVZERO(&cbp.gidnum);,
 319         Debug(LDAP_DEBUG_TRACE,"nssov_group_bymember(%s)",cbp.user.bv_val,0,0);,
 320         NSLCD_ACTION_GROUP_BYMEMBER,
 321         mkfilter_group_bymember(&cbp,&filter)
 322 )
 323
 324 NSSOV_HANDLE(
 325         group,all,
 326         struct berval filter;
 327         /* no parameters to read */
 328         cbp.wantmembers = 1;
 329         cbp.ni = ni;
 330         BER_BVZERO(&cbp.name);
 331         BER_BVZERO(&cbp.gidnum);,
 332         Debug(LDAP_DEBUG_TRACE,"nssov_group_all()",0,0,0);,
 333         NSLCD_ACTION_GROUP_ALL,
 334         (filter=cbp.mi->mi_filter,0)
 335 )