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

   1 /* passwd.c - password 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 /* ( nisSchema.2.0 NAME 'posixAccount' SUP top AUXILIARY
  24  *       DESC 'Abstraction of an account with POSIX attributes'
  25  *       MUST ( cn $ uid $ uidNumber $ gidNumber $ homeDirectory )
  26  *       MAY ( userPassword $ loginShell $ gecos $ description ) )
  27  */
  28
  29 /* the basic search filter for searches */
  30 static struct berval passwd_filter = BER_BVC("(objectClass=posixAccount)");
  31
  32 /* the attributes used in searches */
  33 static struct berval passwd_keys[] = {
  34         BER_BVC("uid"),
  35         BER_BVC("userPassword"),
  36         BER_BVC("uidNumber"),
  37         BER_BVC("gidNumber"),
  38         BER_BVC("gecos"),
  39         BER_BVC("cn"),
  40         BER_BVC("homeDirectory"),
  41         BER_BVC("loginShell"),
  42         BER_BVC("objectClass"),
  43         BER_BVNULL
  44 };
  45
  46 #define UID_KEY 0
  47 #define PWD_KEY 1
  48 #define UIDN_KEY        2
  49 #define GIDN_KEY        3
  50 #define GEC_KEY 4
  51 #define CN_KEY  5
  52 #define DIR_KEY 6
  53 #define SHL_KEY 7
  54
  55 /* default values for attributes */
  56 static struct berval default_passwd_userPassword        = BER_BVC("*"); /* unmatchable */
  57 static struct berval default_passwd_homeDirectory       = BER_BVC("");
  58 static struct berval default_passwd_loginShell          = BER_BVC("");
  59
  60 static struct berval shadow_passwd = BER_BVC("x");
  61
  62 NSSOV_INIT(passwd)
  63
  64 /*
  65          Checks to see if the specified name is a valid user name.
  66
  67          This test is based on the definition from POSIX (IEEE Std 1003.1, 2004, 3.426 User Name
  68          and 3.276 Portable Filename Character Set):
  69          http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap03.html#tag_03_426
  70          http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap03.html#tag_03_276
  71
  72          The standard defines user names valid if they contain characters from
  73          the set [A-Za-z0-9._-] where the hyphen should not be used as first
  74          character. As an extension this test allows the dolar '$' sign as the last
  75          character to support Samba special accounts.
  76 */
  77 int isvalidusername(struct berval *bv)
  78 {
  79         int i;
  80         char *name = bv->bv_val;
  81         if ((name==NULL)||(name[0]=='\0'))
  82                 return 0;
  83         /* check first character */
  84         if ( ! ( (name[0]>='A' && name[0] <= 'Z') ||
  85                                          (name[0]>='a' && name[0] <= 'z') ||
  86                                          (name[0]>='0' && name[0] <= '9') ||
  87                                          name[0]=='.' || name[0]=='_' ) )
  88                 return 0;
  89         /* check other characters */
  90         for (i=1;i<bv->bv_len;i++)
  91         {
  92                 if ( name[i]=='$' )
  93                 {
  94                         /* if the char is $ we require it to be the last char */
  95                         if (name[i+1]!='\0')
  96                                 return 0;
  97                 }
  98                 else if ( ! ( (name[i]>='A' && name[i] <= 'Z') ||
  99                                                                         (name[i]>='a' && name[i] <= 'z') ||
 100                                                                         (name[i]>='0' && name[i] <= '9') ||
 101                                                                         name[i]=='.' || name[i]=='_'    || name[i]=='-') )
 102                         return 0;
 103         }
 104         /* no test failed so it must be good */
 105         return -1;
 106 }
 107
 108 /* return 1 on success */
 109 int nssov_dn2uid(Operation *op,nssov_info *ni,struct berval *dn,struct berval *uid)
 110 {
 111         nssov_mapinfo *mi = &ni->ni_maps[NM_passwd];
 112         AttributeDescription *ad = mi->mi_attrs[UID_KEY].an_desc;
 113         Entry *e;
 114
 115         /* check for empty string */
 116         if (!dn->bv_len)
 117                 return 0;
 118         /* try to look up uid within DN string */
 119         if (!strncmp(dn->bv_val,ad->ad_cname.bv_val,ad->ad_cname.bv_len) &&
 120                 dn->bv_val[ad->ad_cname.bv_len] == '=')
 121         {
 122                 struct berval bv, rdn;
 123                 dnRdn(dn, &rdn);
 124                 /* check if it is valid */
 125                 bv.bv_val = dn->bv_val + ad->ad_cname.bv_len + 1;
 126                 bv.bv_len = rdn.bv_len - ad->ad_cname.bv_len - 1;
 127                 if (!isvalidusername(&bv))
 128                         return 0;
 129                 ber_dupbv_x( uid, &bv, op->o_tmpmemctx );
 130                 return 1;
 131         }
 132         /* look up the uid from the entry itself */
 133         if (be_entry_get_rw( op, dn, NULL, ad, 0, &e) == LDAP_SUCCESS)
 134         {
 135                 Attribute *a = attr_find(e->e_attrs, ad);
 136                 if (a) {
 137                         ber_dupbv_x(uid, &a->a_vals[0], op->o_tmpmemctx);
 138                 }
 139                 be_entry_release_r(op, e);
 140                 if (a)
 141                         return 1;
 142         }
 143         return 0;
 144 }
 145
 146 static int uid2dn_cb(Operation *op,SlapReply *rs)
 147 {
 148         if ( rs->sr_type == REP_SEARCH )
 149         {
 150                 struct berval *bv = op->o_callback->sc_private;
 151                 if ( !BER_BVISNULL(bv)) {
 152                         op->o_tmpfree( bv->bv_val, op->o_tmpmemctx );
 153                         BER_BVZERO(bv);
 154                         return LDAP_ALREADY_EXISTS;
 155                 }
 156                 ber_dupbv_x(bv, &rs->sr_entry->e_name, op->o_tmpmemctx);
 157         }
 158         return LDAP_SUCCESS;
 159 }
 160
 161 int nssov_uid2dn(Operation *op,nssov_info *ni,struct berval *uid,struct berval *dn)
 162 {
 163         nssov_mapinfo *mi = &ni->ni_maps[NM_passwd];
 164         char fbuf[1024];
 165         struct berval filter = {sizeof(fbuf),fbuf};
 166         slap_callback cb = {0};
 167         SlapReply rs = {REP_RESULT};
 168         Operation op2;
 169         int rc;
 170
 171         /* if it isn't a valid username, just bail out now */
 172         if (!isvalidusername(uid))
 173                 return 0;
 174         /* we have to look up the entry */
 175         nssov_filter_byid(mi,UIDN_KEY,uid,&filter);
 176         BER_BVZERO(dn);
 177         cb.sc_private = dn;
 178         cb.sc_response = uid2dn_cb;
 179         op2 = *op;
 180         op2.o_callback = &cb;
 181         op2.o_req_dn = mi->mi_base;
 182         op2.o_req_ndn = mi->mi_base;
 183         op2.ors_scope = mi->mi_scope;
 184         op2.ors_filterstr = filter;
 185         op2.ors_filter = str2filter_x( op, filter.bv_val );
 186         op2.ors_attrs = slap_anlist_no_attrs;
 187         rc = op2.o_bd->be_search( &op2, &rs );
 188         filter_free_x( op, op2.ors_filter, 1 );
 189         return rc == LDAP_SUCCESS;
 190 }
 191
 192 /* the maximum number of uidNumber attributes per entry */
 193 #define MAXUIDS_PER_ENTRY 5
 194
 195 NSSOV_CBPRIV(passwd,
 196         char buf[256];
 197         struct berval name;
 198         struct berval id;);
 199
 200 static struct berval shadowclass = BER_BVC("shadowAccount");
 201
 202 static int write_passwd(nssov_passwd_cbp *cbp,Entry *entry)
 203 {
 204         int32_t tmpint32;
 205         struct berval tmparr[2], tmpuid[2];
 206         const char **tmpvalues;
 207         char *tmp;
 208         struct berval *names;
 209         struct berval *uids;
 210         struct berval passwd = {0};
 211         gid_t gid;
 212         struct berval gecos;
 213         struct berval homedir;
 214         struct berval shell;
 215         Attribute *a;
 216         int i,j;
 217         int use_shadow = 0;
 218         /* get the usernames for this entry */
 219         if (BER_BVISNULL(&cbp->name))
 220         {
 221                 a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[UID_KEY].an_desc);
 222                 if (!a)
 223                 {
 224                         Debug(LDAP_DEBUG_ANY,"passwd entry %s does not contain %s value",
 225                                 entry->e_name.bv_val, cbp->mi->mi_attrs[UID_KEY].an_desc->ad_cname.bv_val,0);
 226                         return 0;
 227                 }
 228                 names = a->a_vals;
 229         }
 230         else
 231         {
 232                 names=tmparr;
 233                 names[0]=cbp->name;
 234                 BER_BVZERO(&names[1]);
 235         }
 236         /* get the password for this entry */
 237         a = attr_find(entry->e_attrs, slap_schema.si_ad_objectClass);
 238         if ( a ) {
 239                 for ( i=0; i<a->a_numvals; i++) {
 240                         if ( bvmatch( &shadowclass, &a->a_nvals[i] )) {
 241                                 use_shadow = 1;
 242                                 break;
 243                         }
 244                 }
 245         }
 246         if ( use_shadow )
 247         {
 248                 /* if the entry has a shadowAccount entry, point to that instead */
 249                 passwd = shadow_passwd;
 250         }
 251         else
 252         {
 253                 a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[PWD_KEY].an_desc);
 254                 if (a)
 255                         get_userpassword(&a->a_vals[0], &passwd);
 256                 if (BER_BVISNULL(&passwd))
 257                         passwd=default_passwd_userPassword;
 258         }
 259         /* get the uids for this entry */
 260         if (BER_BVISNULL(&cbp->id))
 261         {
 262                 a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[UIDN_KEY].an_desc);
 263         if ( !a )
 264                 {
 265                         Debug(LDAP_DEBUG_ANY,"passwd entry %s does not contain %s value",
 266                                 entry->e_name.bv_val, cbp->mi->mi_attrs[UIDN_KEY].an_desc->ad_cname.bv_val,0);
 267                         return 0;
 268                 }
 269                 uids = a->a_vals;
 270         }
 271         else
 272         {
 273                 uids = tmpuid;
 274                 uids[0] = cbp->id;
 275                 BER_BVZERO(&uids[1]);
 276         }
 277         /* get the gid for this entry */
 278         a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[GIDN_KEY].an_desc);
 279         if (!a)
 280         {
 281                 Debug(LDAP_DEBUG_ANY,"passwd entry %s does not contain %s value",
 282                         entry->e_name.bv_val, cbp->mi->mi_attrs[GIDN_KEY].an_desc->ad_cname.bv_val,0);
 283                 return 0;
 284         }
 285         else if (a->a_numvals != 1)
 286         {
 287                 Debug(LDAP_DEBUG_ANY,"passwd entry %s contains multiple %s values",
 288                         entry->e_name.bv_val, cbp->mi->mi_attrs[GIDN_KEY].an_desc->ad_cname.bv_val,0);
 289         }
 290         gid=(gid_t)strtol(a->a_vals[0].bv_val,&tmp,0);
 291         if ((a->a_vals[0].bv_val[0]=='\0')||(*tmp!='\0'))
 292         {
 293                 Debug(LDAP_DEBUG_ANY,"passwd entry %s contains non-numeric %s value",
 294                         entry->e_name.bv_val, cbp->mi->mi_attrs[GIDN_KEY].an_desc->ad_cname.bv_val,0);
 295                 return 0;
 296         }
 297         /* get the gecos for this entry (fall back to cn) */
 298         a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[GEC_KEY].an_desc);
 299         if (!a)
 300                 a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[CN_KEY].an_desc);
 301         if (!a || !a->a_numvals)
 302         {
 303                 Debug(LDAP_DEBUG_ANY,"passwd entry %s does not contain %s or %s value",
 304                         entry->e_name.bv_val,
 305                         cbp->mi->mi_attrs[GEC_KEY].an_desc->ad_cname.bv_val,
 306                         cbp->mi->mi_attrs[CN_KEY].an_desc->ad_cname.bv_val);
 307                 return 0;
 308         }
 309         else if (a->a_numvals > 1)
 310         {
 311                 Debug(LDAP_DEBUG_ANY,"passwd entry %s contains multiple %s or %s values",
 312                         entry->e_name.bv_val,
 313                         cbp->mi->mi_attrs[GEC_KEY].an_desc->ad_cname.bv_val,
 314                         cbp->mi->mi_attrs[CN_KEY].an_desc->ad_cname.bv_val);
 315         }
 316         gecos=a->a_vals[0];
 317         /* get the home directory for this entry */
 318         a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[DIR_KEY].an_desc);
 319         if (!a)
 320         {
 321                 Debug(LDAP_DEBUG_ANY,"passwd entry %s does not contain %s value",
 322                         entry->e_name.bv_val, cbp->mi->mi_attrs[DIR_KEY].an_desc->ad_cname.bv_val,0);
 323                 homedir=default_passwd_homeDirectory;
 324         }
 325         else
 326         {
 327                 if (a->a_numvals > 1)
 328                 {
 329                         Debug(LDAP_DEBUG_ANY,"passwd entry %s contains multiple %s values",
 330                                 entry->e_name.bv_val, cbp->mi->mi_attrs[DIR_KEY].an_desc->ad_cname.bv_val,0);
 331                 }
 332                 homedir=a->a_vals[0];
 333                 if (homedir.bv_val[0]=='\0')
 334                         homedir=default_passwd_homeDirectory;
 335         }
 336         /* get the shell for this entry */
 337         a = attr_find(entry->e_attrs, cbp->mi->mi_attrs[SHL_KEY].an_desc);
 338         if (!a)
 339         {
 340                 shell=default_passwd_loginShell;
 341         }
 342         else
 343         {
 344                 if (a->a_numvals > 1)
 345                 {
 346                         Debug(LDAP_DEBUG_ANY,"passwd entry %s contains multiple %s values",
 347                                 entry->e_name.bv_val, cbp->mi->mi_attrs[SHL_KEY].an_desc->ad_cname.bv_val,0);
 348                 }
 349                 shell=a->a_vals[0];
 350                 if (shell.bv_val[0]=='\0')
 351                         shell=default_passwd_loginShell;
 352         }
 353         /* write the entries */
 354         for (i=0;!BER_BVISNULL(&names[i]);i++)
 355         {
 356                 if (!isvalidusername(&names[i]))
 357                 {
 358                         Debug(LDAP_DEBUG_ANY,"nssov: passwd entry %s contains invalid user name: \"%s\"",
 359                                 entry->e_name.bv_val,names[i].bv_val,0);
 360                 }
 361                 else
 362                 {
 363                         for (j=0;!BER_BVISNULL(&uids[j]);j++)
 364                         {
 365                                 char *tmp;
 366                                 uid_t uid;
 367                                 uid = strtol(uids[j].bv_val, &tmp, 0);
 368                                 if ( *tmp ) {
 369                                         Debug(LDAP_DEBUG_ANY,"nssov: passwd entry %s contains non-numeric %s value: \"%s\"",
 370                                                 entry->e_name.bv_val, cbp->mi->mi_attrs[UIDN_KEY].an_desc->ad_cname.bv_val,
 371                                                 names[i].bv_val);
 372                                         continue;
 373                                 }
 374                                 WRITE_INT32(cbp->fp,NSLCD_RESULT_SUCCESS);
 375                                 WRITE_BERVAL(cbp->fp,&names[i]);
 376                                 WRITE_BERVAL(cbp->fp,&passwd);
 377                                 WRITE_TYPE(cbp->fp,uid,uid_t);
 378                                 WRITE_TYPE(cbp->fp,gid,gid_t);
 379                                 WRITE_BERVAL(cbp->fp,&gecos);
 380                                 WRITE_BERVAL(cbp->fp,&homedir);
 381                                 WRITE_BERVAL(cbp->fp,&shell);
 382                         }
 383                 }
 384         }
 385         return 0;
 386 }
 387
 388 NSSOV_CB(passwd)
 389
 390 NSSOV_HANDLE(
 391         passwd,byname,
 392         char fbuf[1024];
 393         struct berval filter = {sizeof(fbuf)};
 394         filter.bv_val = fbuf;
 395         READ_STRING_BUF2(fp,cbp.buf,sizeof(cbp.buf));
 396         cbp.name.bv_len = tmpint32;
 397         cbp.name.bv_val = cbp.buf;
 398         if (!isvalidusername(&cbp.name)) {
 399                 Debug(LDAP_DEBUG_ANY,"nssov_passwd_byname(%s): invalid user name",cbp.name.bv_val,0,0);
 400                 return -1;
 401         }
 402         BER_BVZERO(&cbp.id); ,
 403         Debug(LDAP_DEBUG_TRACE,"nssov_passwd_byname(%s)",cbp.name.bv_val,0,0);,
 404         NSLCD_ACTION_PASSWD_BYNAME,
 405         nssov_filter_byname(cbp.mi,UID_KEY,&cbp.name,&filter)
 406 )
 407
 408 NSSOV_HANDLE(
 409         passwd,byuid,
 410         uid_t uid;
 411         char fbuf[1024];
 412         struct berval filter = {sizeof(fbuf)};
 413         filter.bv_val = fbuf;
 414         READ_TYPE(fp,uid,uid_t);
 415         cbp.id.bv_val = cbp.buf;
 416         cbp.id.bv_len = snprintf(cbp.buf,sizeof(cbp.buf),"%d",uid);
 417         BER_BVZERO(&cbp.name);,
 418         Debug(LDAP_DEBUG_TRACE,"nssov_passwd_byuid(%s)",cbp.id.bv_val,0,0);,
 419         NSLCD_ACTION_PASSWD_BYUID,
 420         nssov_filter_byid(cbp.mi,UIDN_KEY,&cbp.id,&filter)
 421 )
 422
 423 NSSOV_HANDLE(
 424         passwd,all,
 425         struct berval filter;
 426         /* no parameters to read */
 427         BER_BVZERO(&cbp.name);
 428         BER_BVZERO(&cbp.id);,
 429         Debug(LDAP_DEBUG_TRACE,"nssov_passwd_all()",0,0,0);,
 430         NSLCD_ACTION_PASSWD_ALL,
 431         (filter=cbp.mi->mi_filter,0)
 432 )