git.sur5r.net Git - openldap/blob - servers/slapd/passwd.c

   1 /* passwd.c - password extended operation routines */
   2 /* $OpenLDAP$ */
   3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   4  *
   5  * Copyright 1998-2003 The OpenLDAP Foundation.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted only as authorized by the OpenLDAP
  10  * Public License.
  11  *
  12  * A copy of this license is available in the file LICENSE in the
  13  * top-level directory of the distribution or, alternatively, at
  14  * <http://www.OpenLDAP.org/license.html>.
  15  */
  16
  17 #include "portable.h"
  18
  19 #include <stdio.h>
  20
  21 #include <ac/krb.h>
  22 #include <ac/socket.h>
  23 #include <ac/string.h>
  24 #include <ac/unistd.h>
  25
  26 #include "slap.h"
  27
  28 #include <lber_pvt.h>
  29 #include <lutil.h>
  30
  31 int passwd_extop(
  32         Operation *op,
  33         SlapReply *rs )
  34 {
  35         struct berval id = {0, NULL}, old = {0, NULL}, new = {0, NULL},
  36                 dn, ndn, hash, vals[2], tmpbv, *rsp = NULL;
  37         Modifications ml, **modtail;
  38         Operation op2;
  39         slap_callback cb = { slap_null_cb, NULL };
  40
  41         assert( ber_bvcmp( &slap_EXOP_MODIFY_PASSWD, &op->ore_reqoid ) == 0 );
  42
  43         if( op->o_dn.bv_len == 0 ) {
  44                 rs->sr_text = "only authenticated users may change passwords";
  45                 return LDAP_STRONG_AUTH_REQUIRED;
  46         }
  47
  48         ber_dupbv_x( &tmpbv, op->oq_extended.rs_reqdata, op->o_tmpmemctx );
  49         rs->sr_err = slap_passwd_parse( &tmpbv, &id, &old, &new, &rs->sr_text );
  50         if ( rs->sr_err != LDAP_SUCCESS ) {
  51                 return rs->sr_err;
  52         }
  53
  54         if ( id.bv_len ) {
  55                 dn = id;
  56                 /* ndn is in tmpmem, so we don't need to free it */
  57                 rs->sr_err = dnNormalize( 0, NULL, NULL, &dn, &ndn, op->o_tmpmemctx );
  58                 if ( rs->sr_err != LDAP_SUCCESS ) {
  59                         rs->sr_text = "Invalid DN";
  60                         return rs->sr_err;
  61                 }
  62                 op->o_bd = select_backend( &ndn, 0, 0 );
  63         } else {
  64                 dn = op->o_dn;
  65                 ndn = op->o_ndn;
  66                 ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
  67                 op->o_bd = op->o_conn->c_authz_backend;
  68                 ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
  69         }
  70
  71         if( op->o_bd == NULL ) {
  72 #ifdef HAVE_CYRUS_SASL
  73                 return slap_sasl_setpass( op, rs );
  74 #else
  75                 rs->sr_text = "no authz backend";
  76                 return LDAP_OTHER;
  77 #endif
  78         }
  79
  80         if ( ndn.bv_len == 0 ) {
  81                 rs->sr_text = "no password is associated with the Root DSE";
  82                 return LDAP_UNWILLING_TO_PERFORM;
  83         }
  84
  85         if (backend_check_restrictions( op, rs,
  86                         (struct berval *)&slap_EXOP_MODIFY_PASSWD ) != LDAP_SUCCESS) {
  87                 return rs->sr_err;
  88         }
  89
  90
  91 #ifndef SLAPD_MULTIMASTER
  92         /* This does not apply to multi-master case */
  93         if( op->o_bd->be_update_ndn.bv_len ) {
  94                 /* we SHOULD return a referral in this case */
  95                 BerVarray defref = NULL;
  96                 if ( !LDAP_STAILQ_EMPTY( &op->o_bd->be_syncinfo )) {
  97                         syncinfo_t *si;
  98                         LDAP_STAILQ_FOREACH( si, &op->o_bd->be_syncinfo, si_next ) {
  99                                 struct berval tmpbv;
 100                                 ber_dupbv( &tmpbv, &si->si_provideruri_bv[0] );
 101                                 ber_bvarray_add( &defref, &tmpbv );
 102                         }
 103                 } else {
 104                         defref = referral_rewrite( op->o_bd->be_update_refs,
 105                                 NULL, NULL, LDAP_SCOPE_DEFAULT );
 106                 }
 107                 rs->sr_ref = defref;
 108                 return LDAP_REFERRAL;
 109         }
 110 #endif /* !SLAPD_MULTIMASTER */
 111
 112         /* Give the backend a chance to handle this itself */
 113         if ( op->o_bd->be_extended ) {
 114                 rs->sr_err = op->o_bd->be_extended( op, rs );
 115                 if ( rs->sr_err != LDAP_UNWILLING_TO_PERFORM ) {
 116                         return rs->sr_err;
 117                 }
 118         }
 119
 120         /* The backend didn't handle it, so try it here */
 121         if( op->o_bd && !op->o_bd->be_modify ) {
 122                 rs->sr_text = "operation not supported for current user";
 123                 return LDAP_UNWILLING_TO_PERFORM;
 124         }
 125
 126         if ( new.bv_len == 0 ) {
 127                 slap_passwd_generate( &new );
 128                 rsp = slap_passwd_return( &new );
 129         }
 130         if ( new.bv_len == 0 ) {
 131                 rs->sr_text = "password generation failed";
 132                 return LDAP_OTHER;
 133         }
 134         slap_passwd_hash( &new, &hash, &rs->sr_text );
 135         if ( rsp ) {
 136                 free( new.bv_val );
 137         }
 138         if ( hash.bv_len == 0 ) {
 139                 if ( !rs->sr_text ) {
 140                         rs->sr_text = "password hash failed";
 141                 }
 142                 return LDAP_OTHER;
 143         }
 144         vals[0] = hash;
 145         vals[1].bv_val = NULL;
 146         ml.sml_desc = slap_schema.si_ad_userPassword;
 147         ml.sml_values = vals;
 148         ml.sml_nvalues = NULL;
 149         ml.sml_op = LDAP_MOD_REPLACE;
 150         ml.sml_next = NULL;
 151
 152         op2 = *op;
 153         op2.o_tag = LDAP_REQ_MODIFY;
 154         op2.o_callback = &cb;
 155         op2.o_req_dn = dn;
 156         op2.o_req_ndn = ndn;
 157         op2.orm_modlist = &ml;
 158
 159         modtail = &ml.sml_next;
 160         rs->sr_err = slap_mods_opattrs( &op2, &ml, modtail, &rs->sr_text,
 161                 NULL, 0 );
 162
 163         if ( rs->sr_err == LDAP_SUCCESS ) {
 164                 rs->sr_err = op2.o_bd->be_modify( &op2, rs );
 165         }
 166         if ( rs->sr_err == LDAP_SUCCESS ) {
 167                 replog( &op2 );
 168                 rs->sr_rspdata = rsp;
 169         } else if ( rsp ) {
 170                 ber_bvfree( rsp );
 171         }
 172         slap_mods_free( ml.sml_next );
 173         free( hash.bv_val );
 174
 175         return rs->sr_err;
 176 }
 177
 178 int slap_passwd_parse( struct berval *reqdata,
 179         struct berval *id,
 180         struct berval *oldpass,
 181         struct berval *newpass,
 182         const char **text )
 183 {
 184         int rc = LDAP_SUCCESS;
 185         ber_tag_t tag;
 186         ber_len_t len;
 187         BerElementBuffer berbuf;
 188         BerElement *ber = (BerElement *)&berbuf;
 189
 190         if( reqdata == NULL ) {
 191                 return LDAP_SUCCESS;
 192         }
 193
 194         if( reqdata->bv_len == 0 ) {
 195                 *text = "empty request data field";
 196                 return LDAP_PROTOCOL_ERROR;
 197         }
 198
 199         /* ber_init2 uses reqdata directly, doesn't allocate new buffers */
 200         ber_init2( ber, reqdata, 0 );
 201
 202         tag = ber_scanf( ber, "{" /*}*/ );
 203
 204         if( tag != LBER_ERROR ) {
 205                 tag = ber_peek_tag( ber, &len );
 206         }
 207
 208         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
 209                 if( id == NULL ) {
 210 #ifdef NEW_LOGGING
 211                         LDAP_LOG( OPERATION, ERR,
 212                            "slap_passwd_parse: ID not allowed.\n", 0, 0, 0 );
 213 #else
 214                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n",
 215                                 0, 0, 0 );
 216 #endif
 217
 218                         *text = "user must change own password";
 219                         rc = LDAP_UNWILLING_TO_PERFORM;
 220                         goto done;
 221                 }
 222
 223                 tag = ber_scanf( ber, "m", id );
 224
 225                 if( tag == LBER_ERROR ) {
 226 #ifdef NEW_LOGGING
 227                         LDAP_LOG( OPERATION, ERR,
 228                            "slap_passwd_parse:  ID parse failed.\n", 0, 0, 0 );
 229 #else
 230                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 231                                 0, 0, 0 );
 232 #endif
 233
 234                         goto decoding_error;
 235                 }
 236
 237                 tag = ber_peek_tag( ber, &len);
 238         }
 239
 240         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
 241                 if( oldpass == NULL ) {
 242 #ifdef NEW_LOGGING
 243                         LDAP_LOG( OPERATION, ERR,
 244                            "slap_passwd_parse: OLD not allowed.\n" , 0, 0, 0 );
 245 #else
 246                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n",
 247                                 0, 0, 0 );
 248 #endif
 249
 250                         *text = "use bind to verify old password";
 251                         rc = LDAP_UNWILLING_TO_PERFORM;
 252                         goto done;
 253                 }
 254
 255                 tag = ber_scanf( ber, "m", oldpass );
 256
 257                 if( tag == LBER_ERROR ) {
 258 #ifdef NEW_LOGGING
 259                         LDAP_LOG( OPERATION, ERR,
 260                            "slap_passwd_parse:  ID parse failed.\n" , 0, 0, 0 );
 261 #else
 262                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
 263                                 0, 0, 0 );
 264 #endif
 265
 266                         goto decoding_error;
 267                 }
 268
 269                 tag = ber_peek_tag( ber, &len );
 270         }
 271
 272         if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) {
 273                 if( newpass == NULL ) {
 274 #ifdef NEW_LOGGING
 275                         LDAP_LOG( OPERATION, ERR,
 276                            "slap_passwd_parse:  NEW not allowed.\n", 0, 0, 0 );
 277 #else
 278                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n",
 279                                 0, 0, 0 );
 280 #endif
 281
 282                         *text = "user specified passwords disallowed";
 283                         rc = LDAP_UNWILLING_TO_PERFORM;
 284                         goto done;
 285                 }
 286
 287                 tag = ber_scanf( ber, "m", newpass );
 288
 289                 if( tag == LBER_ERROR ) {
 290 #ifdef NEW_LOGGING
 291                         LDAP_LOG( OPERATION, ERR,
 292                            "slap_passwd_parse:  OLD parse failed.\n", 0, 0, 0 );
 293 #else
 294                         Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n",
 295                                 0, 0, 0 );
 296 #endif
 297
 298                         goto decoding_error;
 299                 }
 300
 301                 tag = ber_peek_tag( ber, &len );
 302         }
 303
 304         if( len != 0 ) {
 305 decoding_error:
 306 #ifdef NEW_LOGGING
 307                 LDAP_LOG( OPERATION, ERR,
 308                         "slap_passwd_parse: decoding error, len=%ld\n", (long)len, 0, 0 );
 309 #else
 310                 Debug( LDAP_DEBUG_TRACE,
 311                         "slap_passwd_parse: decoding error, len=%ld\n",
 312                         (long) len, 0, 0 );
 313 #endif
 314
 315                 *text = "data decoding error";
 316                 rc = LDAP_PROTOCOL_ERROR;
 317         }
 318
 319 done:
 320         return rc;
 321 }
 322
 323 struct berval * slap_passwd_return(
 324         struct berval           *cred )
 325 {
 326         int rc;
 327         struct berval *bv = NULL;
 328         BerElementBuffer berbuf;
 329         /* opaque structure, size unknown but smaller than berbuf */
 330         BerElement *ber = (BerElement *)&berbuf;
 331
 332         assert( cred != NULL );
 333
 334 #ifdef NEW_LOGGING
 335         LDAP_LOG( OPERATION, ENTRY,
 336                 "slap_passwd_return: %ld\n",(long)cred->bv_len, 0, 0 );
 337 #else
 338         Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
 339                 (long) cred->bv_len, 0, 0 );
 340 #endif
 341
 342         ber_init_w_nullc( ber, LBER_USE_DER );
 343
 344         rc = ber_printf( ber, "{tON}",
 345                 LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
 346
 347         if( rc >= 0 ) {
 348                 (void) ber_flatten( ber, &bv );
 349         }
 350
 351         ber_free_buf( ber );
 352
 353         return bv;
 354 }
 355
 356 int
 357 slap_passwd_check(
 358         Connection *conn,
 359         Attribute *a,
 360         struct berval *cred,
 361         const char **text )
 362 {
 363         int result = 1;
 364         struct berval *bv;
 365
 366 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 367         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 368 #ifdef SLAPD_SPASSWD
 369         lutil_passwd_sasl_conn = conn->c_sasl_authctx;
 370 #endif
 371 #endif
 372
 373         for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
 374                 if( !lutil_passwd( bv, cred, NULL, text ) ) {
 375                         result = 0;
 376                         break;
 377                 }
 378         }
 379
 380 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 381 #ifdef SLAPD_SPASSWD
 382         lutil_passwd_sasl_conn = NULL;
 383 #endif
 384         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 385 #endif
 386
 387         return result;
 388 }
 389
 390 void
 391 slap_passwd_generate( struct berval *pass )
 392 {
 393         struct berval *tmp;
 394 #ifdef NEW_LOGGING
 395         LDAP_LOG( OPERATION, ENTRY, "slap_passwd_generate: begin\n", 0, 0, 0 );
 396 #else
 397         Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 );
 398 #endif
 399         /*
 400          * generate passwords of only 8 characters as some getpass(3)
 401          * implementations truncate at 8 characters.
 402          */
 403         tmp = lutil_passwd_generate( 8 );
 404         if (tmp) {
 405                 *pass = *tmp;
 406                 free(tmp);
 407         } else {
 408                 pass->bv_val = NULL;
 409                 pass->bv_len = 0;
 410         }
 411 }
 412
 413 void
 414 slap_passwd_hash(
 415         struct berval * cred,
 416         struct berval * new,
 417         const char **text )
 418 {
 419         struct berval *tmp;
 420 #ifdef LUTIL_SHA1_BYTES
 421         char* hash = default_passwd_hash ?  default_passwd_hash : "{SSHA}";
 422 #else
 423         char* hash = default_passwd_hash ?  default_passwd_hash : "{SMD5}";
 424 #endif
 425
 426
 427 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 428         ldap_pvt_thread_mutex_lock( &passwd_mutex );
 429 #endif
 430
 431         tmp = lutil_passwd_hash( cred , hash, text );
 432
 433 #if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
 434         ldap_pvt_thread_mutex_unlock( &passwd_mutex );
 435 #endif
 436
 437         if( tmp == NULL ) {
 438                 new->bv_len = 0;
 439                 new->bv_val = NULL;
 440         }
 441
 442         *new = *tmp;
 443         free( tmp );
 444         return;
 445 }