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

   1 /* passwd.c - password lookup routines */
   2 /* $OpenLDAP$ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 2008-2018 The OpenLDAP Foundation.
   6  * Portions Copyright 2008 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 /* ( nisSchema.2.0 NAME 'posixAccount' SUP top AUXILIARY
  26  *       DESC 'Abstraction of an account with POSIX attributes'
  27  *       MUST ( cn $ uid $ uidNumber $ gidNumber $ homeDirectory )
  28  *       MAY ( userPassword $ loginShell $ gecos $ description ) )
  29  */
  30
  31 /* the basic search filter for searches */
  32 static struct berval passwd_filter = BER_BVC("(objectClass=posixAccount)");
  33
  34 /* the attributes used in searches */
  35 static struct berval passwd_keys[] = {
  36         BER_BVC("uid"),
  37         BER_BVC("userPassword"),
  38         BER_BVC("uidNumber"),
  39         BER_BVC("gidNumber"),
  40         BER_BVC("gecos"),
  41         BER_BVC("cn"),
  42         BER_BVC("homeDirectory"),
  43         BER_BVC("loginShell"),
  44         BER_BVC("objectClass"),
  45         BER_BVNULL
  46 };
  47
  48 #define UID_KEY 0
  49 #define PWD_KEY 1
  50 #define UIDN_KEY        2
  51 #define GIDN_KEY        3
  52 #define GEC_KEY 4
  53 #define CN_KEY  5
  54 #define DIR_KEY 6
  55 #define SHL_KEY 7
  56
  57 /* default values for attributes */
  58 static struct berval default_passwd_userPassword        = BER_BVC("*"); /* unmatchable */
  59 static struct berval default_passwd_homeDirectory       = BER_BVC("");
  60 static struct berval default_passwd_loginShell          = BER_BVC("");
  61
  62 static struct berval shadow_passwd = BER_BVC("x");
  63
  64 NSSOV_INIT(passwd)
  65
  66 /*
  67          Checks to see if the specified name is a valid user name.
  68
  69          This test is based on the definition from POSIX (IEEE Std 1003.1, 2004, 3.426 User Name
  70          and 3.276 Portable Filename Character Set):
  71          http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap03.html#tag_03_426
  72          http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap03.html#tag_03_276
  73
  74          The standard defines user names valid if they contain characters from
  75          the set [A-Za-z0-9._-] where the hyphen should not be used as first
  76          character. As an extension this test allows the dolar '$' sign as the last
  77          character to support Samba special accounts.
  78 */
  79 int isvalidusername(struct berval *bv)
  80 {
  81         int i;
  82         char *name = bv->bv_val;
  83         if ((name==NULL)||(name[0]=='\0'))
  84                 return 0;
  85         /* check first character */
  86         if ( ! ( (name[0]>='A' && name[0] <= 'Z') ||
  87                                          (name[0]>='a' && name[0] <= 'z') ||
  88                                          (name[0]>='0' && name[0] <= '9') ||
  89                                          name[0]=='.' || name[0]=='_' ) )
  90                 return 0;
  91         /* check other characters */
  92         for (i=1;i<bv->bv_len;i++)
  93         {
  94                 if ( name[i]=='$' )
  95                 {
  96                         /* if the char is $ we require it to be the last char */
  97                         if (name[i+1]!='\0')
  98                                 return 0;
  99                 }
 100                 else if ( ! ( (name[i]>='A' && name[i] <= 'Z') ||
 101                                                                         (name[i]>='a' && name[i] <= 'z') ||
 102                                                                         (name[i]>='0' && name[i] <= '9') ||
 103                                                                         name[i]=='.' || name[i]=='_'    || name[i]=='-') )
 104                         return 0;
 105         }
 106         /* no test failed so it must be good */
 107         return -1;
 108 }
 109
 110 /* return 1 on success */
 111 int nssov_dn2uid(Operation *op,nssov_info *ni,struct berval *dn,struct berval *uid)
 112 {
 113         nssov_mapinfo *mi = &ni->ni_maps[NM_passwd];
 114         AttributeDescription *ad = mi->mi_attrs[UID_KEY].an_desc;
 115         Entry *e;
 116
 117         /* check for empty string */
 118         if (!dn->bv_len)
 119                 return 0;
 120         /* try to look up uid within DN string */
 121         if (!strncmp(dn->bv_val,ad->ad_cname.bv_val,ad->ad_cname.bv_len) &&
 122                 dn->bv_val[ad->ad_cname.bv_len] == '=')
 123         {
 124                 struct berval bv, rdn;
 125                 dnRdn(dn, &rdn);
 126                 /* check if it is valid */
 127                 bv.bv_val = dn->bv_val + ad->ad_cname.bv_len + 1;
 128                 bv.bv_len = rdn.bv_len - ad->ad_cname.bv_len - 1;
 129                 if (!isvalidusername(&bv))
 130                         return 0;
 131                 ber_dupbv_x( uid, &bv, op->o_tmpmemctx );
 132                 return 1;
 133         }
 134         /* look up the uid from the entry itself */
 135         if (be_entry_get_rw( op, dn, NULL, ad, 0, &e) == LDAP_SUCCESS)
 136         {
 137                 Attribute *a = attr_find(e->e_attrs, ad);
 138                 if (a) {
 139                         ber_dupbv_x(uid, &a->a_vals[0], op->o_tmpmemctx);
 140                 }
 141                 be_entry_release_r(op, e);
 142                 if (a)
 143                         return 1;
 144         }
 145         return 0;
 146 }
 147
 148 int nssov_name2dn_cb(Operation *op,SlapReply *rs)
 149 {
 150         if ( rs->sr_type == REP_SEARCH )
 151         {
 152                 struct berval *bv = op->o_callback->sc_private;
 153                 if ( !BER_BVISNULL(bv)) {
 154                         op->o_tmpfree( bv->bv_val, op->o_tmpmemctx );
 155                         BER_BVZERO(bv);
 156                         return LDAP_ALREADY_EXISTS;
 157                 }
 158                 ber_dupbv_x(bv, &rs->sr_entry->e_name, op->o_tmpmemctx);
 159         }
 160         return LDAP_SUCCESS;
 161 }
 162
 163 int nssov_uid2dn(Operation *op,nssov_info *ni,struct berval *uid,struct berval *dn)
 164 {
 165         nssov_mapinfo *mi = &ni->ni_maps[NM_passwd];
 166         char fbuf[1024];
 167         struct berval filter = {sizeof(fbuf),fbuf};
 168         slap_callback cb = {0};
 169         SlapReply rs = {REP_RESULT};
 170         Operation op2;
 171         int rc;
 172
 173         /* if it isn't a valid username, just bail out now */
 174         if (!isvalidusername(uid))
 175                 return 0;
 176         /* we have to look up the entry */
 177         nssov_filter_byid(mi,UID_KEY,uid,&filter);
 178         BER_BVZERO(dn);
 179         cb.sc_private = dn;
 180         cb.sc_response = nssov_name2dn_cb;
 181         op2 = *op;
 182         op2.o_callback = &cb;
 183         op2.o_req_dn = mi->mi_base;
 184         op2.o_req_ndn = mi->mi_base;
 185         op2.ors_scope = mi->mi_scope;
 186         op2.ors_filterstr = filter;
 187         op2.ors_filter = str2filter_x( op, filter.bv_val );
 188         op2.ors_attrs = slap_anlist_no_attrs;
 189         op2.ors_tlimit = SLAP_NO_LIMIT;
 190         op2.ors_slimit = SLAP_NO_LIMIT;
 191         rc = op2.o_bd->be_search( &op2, &rs );
 192         filter_free_x( op, op2.ors_filter, 1 );
 193         return rc == LDAP_SUCCESS && !BER_BVISNULL(dn);
 194 }
 195
 196 /* the maximum number of uidNumber attributes per entry */
 197 #define MAXUIDS_PER_ENTRY 5
 198
 199 NSSOV_CBPRIV(passwd,
 200         char buf[256];
 201         struct berval name;
 202         struct berval id;);
 203
 204 static struct berval shadowclass = BER_BVC("shadowAccount");
 205
 206 static int write_passwd(nssov_passwd_cbp *cbp,Entry *entry)
 207 {
 208         int32_t tmpint32;
 209         struct berval tmparr[2], tmpuid[2];
 210         char *tmp;
 211         struct berval *names;
 212         struct berval *uids;
 213         struct berval passwd = {0};
 214         gid_t gid;
 215         struct berval gecos;
 216         struct berval homedir;
 217         struct berval shell;
 218         Attribute *a;
 219         int i,j;
 220         int use_shadow = 0;
 221         /* get the usernames for this entry */
 222         if (BER_BVISNULL(&cbp->name))
 223         {
 224                 a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[UID_KEY].an_desc);
 225                 if (!a)
 226                 {
 227                         Debug(LDAP_DEBUG_ANY,"passwd entry %s does not contain %s value\n",
 228                                 entry->e_name.bv_val, cbp->mi->mi_attrs[UID_KEY].an_desc->ad_cname.bv_val,0);
 229                         return 0;
 230                 }
 231                 names = a->a_vals;
 232         }
 233         else
 234         {
 235                 names=tmparr;
 236                 names[0]=cbp->name;
 237                 BER_BVZERO(&names[1]);
 238         }
 239         /* get the password for this entry */
 240         a = attr_find(entry->e_attrs, slap_schema.si_ad_objectClass);
 241         if ( a ) {
 242                 for ( i=0; i<a->a_numvals; i++) {
 243                         if ( bvmatch( &shadowclass, &a->a_nvals[i] )) {
 244                                 use_shadow = 1;
 245                                 break;
 246                         }
 247                 }
 248         }
 249         if ( use_shadow )
 250         {
 251                 /* if the entry has a shadowAccount entry, point to that instead */
 252                 passwd = shadow_passwd;
 253         }
 254         else
 255         {
 256                 a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[PWD_KEY].an_desc);
 257                 if (a)
 258                         get_userpassword(&a->a_vals[0], &passwd);
 259                 if (BER_BVISNULL(&passwd))
 260                         passwd=default_passwd_userPassword;
 261         }
 262         /* get the uids for this entry */
 263         if (BER_BVISNULL(&cbp->id))
 264         {
 265                 a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[UIDN_KEY].an_desc);
 266         if ( !a )
 267                 {
 268                         Debug(LDAP_DEBUG_ANY,"passwd entry %s does not contain %s value\n",
 269                                 entry->e_name.bv_val, cbp->mi->mi_attrs[UIDN_KEY].an_desc->ad_cname.bv_val,0);
 270                         return 0;
 271                 }
 272                 uids = a->a_vals;
 273         }
 274         else
 275         {
 276                 uids = tmpuid;
 277                 uids[0] = cbp->id;
 278                 BER_BVZERO(&uids[1]);
 279         }
 280         /* get the gid for this entry */
 281         a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[GIDN_KEY].an_desc);
 282         if (!a)
 283         {
 284                 Debug(LDAP_DEBUG_ANY,"passwd entry %s does not contain %s value\n",
 285                         entry->e_name.bv_val, cbp->mi->mi_attrs[GIDN_KEY].an_desc->ad_cname.bv_val,0);
 286                 return 0;
 287         }
 288         else if (a->a_numvals != 1)
 289         {
 290                 Debug(LDAP_DEBUG_ANY,"passwd entry %s contains multiple %s values\n",
 291                         entry->e_name.bv_val, cbp->mi->mi_attrs[GIDN_KEY].an_desc->ad_cname.bv_val,0);
 292         }
 293         gid=(gid_t)strtol(a->a_vals[0].bv_val,&tmp,0);
 294         if ((a->a_vals[0].bv_val[0]=='\0')||(*tmp!='\0'))
 295         {
 296                 Debug(LDAP_DEBUG_ANY,"passwd entry %s contains non-numeric %s value\n",
 297                         entry->e_name.bv_val, cbp->mi->mi_attrs[GIDN_KEY].an_desc->ad_cname.bv_val,0);
 298                 return 0;
 299         }
 300         /* get the gecos for this entry (fall back to cn) */
 301         a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[GEC_KEY].an_desc);
 302         if (!a)
 303                 a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[CN_KEY].an_desc);
 304         if (!a || !a->a_numvals)
 305         {
 306                 Debug(LDAP_DEBUG_ANY,"passwd entry %s does not contain %s or %s value\n",
 307                         entry->e_name.bv_val,
 308                         cbp->mi->mi_attrs[GEC_KEY].an_desc->ad_cname.bv_val,
 309                         cbp->mi->mi_attrs[CN_KEY].an_desc->ad_cname.bv_val);
 310                 return 0;
 311         }
 312         else if (a->a_numvals > 1)
 313         {
 314                 Debug(LDAP_DEBUG_ANY,"passwd entry %s contains multiple %s or %s values\n",
 315                         entry->e_name.bv_val,
 316                         cbp->mi->mi_attrs[GEC_KEY].an_desc->ad_cname.bv_val,
 317                         cbp->mi->mi_attrs[CN_KEY].an_desc->ad_cname.bv_val);
 318         }
 319         gecos=a->a_vals[0];
 320         /* get the home directory for this entry */
 321         a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[DIR_KEY].an_desc);
 322         if (!a)
 323         {
 324                 Debug(LDAP_DEBUG_ANY,"passwd entry %s does not contain %s value\n",
 325                         entry->e_name.bv_val, cbp->mi->mi_attrs[DIR_KEY].an_desc->ad_cname.bv_val,0);
 326                 homedir=default_passwd_homeDirectory;
 327         }
 328         else
 329         {
 330                 if (a->a_numvals > 1)
 331                 {
 332                         Debug(LDAP_DEBUG_ANY,"passwd entry %s contains multiple %s values\n",
 333                                 entry->e_name.bv_val, cbp->mi->mi_attrs[DIR_KEY].an_desc->ad_cname.bv_val,0);
 334                 }
 335                 homedir=a->a_vals[0];
 336                 if (homedir.bv_val[0]=='\0')
 337                         homedir=default_passwd_homeDirectory;
 338         }
 339         /* get the shell for this entry */
 340         a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[SHL_KEY].an_desc);
 341         if (!a)
 342         {
 343                 shell=default_passwd_loginShell;
 344         }
 345         else
 346         {
 347                 if (a->a_numvals > 1)
 348                 {
 349                         Debug(LDAP_DEBUG_ANY,"passwd entry %s contains multiple %s values\n",
 350                                 entry->e_name.bv_val, cbp->mi->mi_attrs[SHL_KEY].an_desc->ad_cname.bv_val,0);
 351                 }
 352                 shell=a->a_vals[0];
 353                 if (shell.bv_val[0]=='\0')
 354                         shell=default_passwd_loginShell;
 355         }
 356         /* write the entries */
 357         for (i=0;!BER_BVISNULL(&names[i]);i++)
 358         {
 359                 if (!isvalidusername(&names[i]))
 360                 {
 361                         Debug(LDAP_DEBUG_ANY,"nssov: passwd entry %s contains invalid user name: \"%s\"\n",
 362                                 entry->e_name.bv_val,names[i].bv_val,0);
 363                 }
 364                 else
 365                 {
 366                         for (j=0;!BER_BVISNULL(&uids[j]);j++)
 367                         {
 368                                 char *tmp;
 369                                 uid_t uid;
 370                                 uid = strtol(uids[j].bv_val, &tmp, 0);
 371                                 if ( *tmp ) {
 372                                         Debug(LDAP_DEBUG_ANY,"nssov: passwd entry %s contains non-numeric %s value: \"%s\"\n",
 373                                                 entry->e_name.bv_val, cbp->mi->mi_attrs[UIDN_KEY].an_desc->ad_cname.bv_val,
 374                                                 names[i].bv_val);
 375                                         continue;
 376                                 }
 377                                 WRITE_INT32(cbp->fp,NSLCD_RESULT_BEGIN);
 378                                 WRITE_BERVAL(cbp->fp,&names[i]);
 379                                 WRITE_BERVAL(cbp->fp,&passwd);
 380                                 WRITE_INT32(cbp->fp,uid);
 381                                 WRITE_INT32(cbp->fp,gid);
 382                                 WRITE_BERVAL(cbp->fp,&gecos);
 383                                 WRITE_BERVAL(cbp->fp,&homedir);
 384                                 WRITE_BERVAL(cbp->fp,&shell);
 385                         }
 386                 }
 387         }
 388         return 0;
 389 }
 390
 391 NSSOV_CB(passwd)
 392
 393 NSSOV_HANDLE(
 394         passwd,byname,
 395         char fbuf[1024];
 396         struct berval filter = {sizeof(fbuf)};
 397         filter.bv_val = fbuf;
 398         READ_STRING(fp,cbp.buf);
 399         cbp.name.bv_len = tmpint32;
 400         cbp.name.bv_val = cbp.buf;
 401         if (!isvalidusername(&cbp.name)) {
 402                 Debug(LDAP_DEBUG_ANY,"nssov_passwd_byname(%s): invalid user name\n",cbp.name.bv_val,0,0);
 403                 return -1;
 404         }
 405         BER_BVZERO(&cbp.id); ,
 406         Debug(LDAP_DEBUG_TRACE,"nssov_passwd_byname(%s)\n",cbp.name.bv_val,0,0);,
 407         NSLCD_ACTION_PASSWD_BYNAME,
 408         nssov_filter_byname(cbp.mi,UID_KEY,&cbp.name,&filter)
 409 )
 410
 411 NSSOV_HANDLE(
 412         passwd,byuid,
 413         uid_t uid;
 414         char fbuf[1024];
 415         struct berval filter = {sizeof(fbuf)};
 416         filter.bv_val = fbuf;
 417         READ_INT32(fp,uid);
 418         cbp.id.bv_val = cbp.buf;
 419         cbp.id.bv_len = snprintf(cbp.buf,sizeof(cbp.buf),"%d",uid);
 420         BER_BVZERO(&cbp.name);,
 421         Debug(LDAP_DEBUG_TRACE,"nssov_passwd_byuid(%s)\n",cbp.id.bv_val,0,0);,
 422         NSLCD_ACTION_PASSWD_BYUID,
 423         nssov_filter_byid(cbp.mi,UIDN_KEY,&cbp.id,&filter)
 424 )
 425
 426 NSSOV_HANDLE(
 427         passwd,all,
 428         struct berval filter;
 429         /* no parameters to read */
 430         BER_BVZERO(&cbp.name);
 431         BER_BVZERO(&cbp.id);,
 432         Debug(LDAP_DEBUG_TRACE,"nssov_passwd_all()\n",0,0,0);,
 433         NSLCD_ACTION_PASSWD_ALL,
 434         (filter=cbp.mi->mi_filter,0)
 435 )