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

   1 /* acl.c - routines to parse and check acl's */
   2
   3 #include "portable.h"
   4
   5 #include <stdio.h>
   6
   7 #include <ac/ctype.h>
   8 #include <ac/regex.h>
   9 #include <ac/socket.h>
  10 #include <ac/string.h>
  11 #include <ac/unistd.h>
  12
  13 #include "slap.h"
  14
  15 static void             split(char *line, int splitchar, char **left, char **right);
  16 static void             acl_append(AccessControl **l, AccessControl *a);
  17 static void             access_append(Access **l, Access *a);
  18 static void             acl_usage(void);
  19 #ifdef LDAP_DEBUG
  20 static void             print_acl(AccessControl *a);
  21 static void             print_access(Access *b);
  22 #endif
  23
  24 static int
  25 regtest(char *fname, int lineno, char *pat) {
  26         int e;
  27         regex_t re;
  28
  29         char buf[512];
  30         unsigned size;
  31
  32         char *sp;
  33         char *dp;
  34         int  flag;
  35
  36         sp = pat;
  37         dp = buf;
  38         size = 0;
  39         buf[0] = '\0';
  40
  41         for (size = 0, flag = 0; (size < sizeof(buf)) && *sp; sp++) {
  42                 if (flag) {
  43                         if (*sp == '$'|| (*sp >= '0' && *sp <= '9')) {
  44                                 *dp++ = *sp;
  45                                 size++;
  46                         }
  47                         flag = 0;
  48
  49                 } else {
  50                         if (*sp == '$') {
  51                                 flag = 1;
  52                         } else {
  53                                 *dp++ = *sp;
  54                                 size++;
  55                         }
  56                 }
  57         }
  58
  59         *dp = '\0';
  60         if ( size >= (sizeof(buf)-1) ) {
  61                 fprintf( stderr,
  62                         "%s: line %d: regular expression \"%s\" too large\n",
  63                         fname, lineno, pat, 0 );
  64                 acl_usage();
  65         }
  66
  67         if ((e = regcomp(&re, buf, REG_EXTENDED|REG_ICASE))) {
  68                 char error[512];
  69                 regerror(e, &re, error, sizeof(error));
  70                 fprintf( stderr,
  71                         "%s: line %d: regular expression \"%s\" bad because of %s\n",
  72                         fname, lineno, pat, error );
  73                 acl_usage();
  74                 return(0);
  75         }
  76         regfree(&re);
  77         return(1);
  78 }
  79
  80 void
  81 parse_acl(
  82     Backend     *be,
  83     char        *fname,
  84     int         lineno,
  85     int         argc,
  86     char        **argv
  87 )
  88 {
  89         int             i;
  90         char            *left, *right;
  91         AccessControl   *a;
  92         Access  *b;
  93
  94         a = NULL;
  95         for ( i = 1; i < argc; i++ ) {
  96                 /* to clause - select which entries are protected */
  97                 if ( strcasecmp( argv[i], "to" ) == 0 ) {
  98                         if ( a != NULL ) {
  99                                 fprintf( stderr,
 100                 "%s: line %d: only one to clause allowed in access line\n",
 101                                     fname, lineno );
 102                                 acl_usage();
 103                         }
 104                         a = (AccessControl *) ch_calloc( 1, sizeof(AccessControl) );
 105                         for ( ++i; i < argc; i++ ) {
 106                                 if ( strcasecmp( argv[i], "by" ) == 0 ) {
 107                                         i--;
 108                                         break;
 109                                 }
 110
 111                                 if ( strcasecmp( argv[i], "*" ) == 0 ) {
 112                                         a->acl_dn_pat = ch_strdup( ".*" );
 113                                         continue;
 114                                 }
 115
 116                                 split( argv[i], '=', &left, &right );
 117                                 if ( right == NULL || *right == '\0' ) {
 118                                         fprintf( stderr,
 119         "%s: line %d: missing \"=\" in (or value after) \"%s\" in to clause\n",
 120                                             fname, lineno, left );
 121                                         acl_usage();
 122                                 }
 123
 124                                 if ( strcasecmp( left, "filter" ) == 0 ) {
 125                                         if ( (a->acl_filter = str2filter(
 126                                             right )) == NULL ) {
 127                                                 fprintf( stderr,
 128                                 "%s: line %d: bad filter \"%s\" in to clause\n",
 129                                                     fname, lineno, right );
 130                                                 acl_usage();
 131                                         }
 132
 133                                 } else if ( strcasecmp( left, "dn" ) == 0 ) {
 134                                         int e;
 135
 136                                         if ((e = regcomp(&a->acl_dn_re, right,
 137                                                 REG_EXTENDED|REG_ICASE))) {
 138                                                 char buf[512];
 139                                                 regerror(e, &a->acl_dn_re, buf, sizeof(buf));
 140                                                 fprintf( stderr,
 141                                 "%s: line %d: regular expression \"%s\" bad because of %s\n",
 142                                                         fname, lineno, right, buf );
 143                                                 acl_usage();
 144
 145                                         } else {
 146                                                 a->acl_dn_pat = ch_strdup( right );
 147                                         }
 148
 149                                 } else if ( strncasecmp( left, "attr", 4 ) == 0 ) {
 150                                         char    **alist;
 151
 152                                         alist = str2charray( right, "," );
 153                                         charray_merge( &a->acl_attrs, alist );
 154                                         charray_free( alist );
 155
 156                                 } else {
 157                                         fprintf( stderr,
 158                                                 "%s: line %d: expecting <what> got \"%s\"\n",
 159                                             fname, lineno, left );
 160                                         acl_usage();
 161                                 }
 162                         }
 163
 164                 /* by clause - select who has what access to entries */
 165                 } else if ( strcasecmp( argv[i], "by" ) == 0 ) {
 166                         if ( a == NULL ) {
 167                                 fprintf( stderr,
 168                                         "%s: line %d: to clause required before by clause in access line\n",
 169                                     fname, lineno );
 170                                 acl_usage();
 171                         }
 172                         /*
 173                          * by clause consists of <who> and <access>
 174                          */
 175
 176                         b = (Access *) ch_calloc( 1, sizeof(Access) );
 177
 178                         if ( ++i == argc ) {
 179                                 fprintf( stderr,
 180                             "%s: line %d: premature eol: expecting <who>\n",
 181                                     fname, lineno );
 182                                 acl_usage();
 183                         }
 184
 185                         /* get <who> */
 186                         for ( ; i < argc; i++ ) {
 187                                 char* pat;
 188                                 split( argv[i], '=', &left, &right );
 189
 190                                 if ( strcasecmp( argv[i], "*" ) == 0 ) {
 191                                         pat = ch_strdup( ".*" );
 192                                 } else if ( strcasecmp( argv[i], "anonymous" ) == 0 ) {
 193                                         pat = ch_strdup( "anonymous" );
 194                                 } else if ( strcasecmp( argv[i], "self" ) == 0 ) {
 195                                         pat = ch_strdup( "self" );
 196                                 } else if ( strcasecmp( left, "dn" ) == 0 ) {
 197                                         regtest(fname, lineno, right);
 198                                         pat = ch_strdup( right );
 199                                 }
 200
 201                                 if( pat != NULL ) {
 202                                         if( b->a_dn_pat != NULL ) {
 203                                                 fprintf( stderr,
 204                                                     "%s: line %d: dn pattern already specified.\n",
 205                                                     fname, lineno );
 206                                                 acl_usage();
 207                                         }
 208
 209                                         b->a_dn_pat = pat;
 210                                         continue;
 211                                 }
 212
 213                                 if ( strcasecmp( left, "dnattr" ) == 0 ) {
 214                                         if( b->a_dn_pat != NULL ) {
 215                                                 fprintf( stderr,
 216                                                         "%s: line %d: dnaddr already specified.\n",
 217                                                         fname, lineno );
 218                                                 acl_usage();
 219                                         }
 220
 221                                         b->a_dn_at = ch_strdup( right );
 222                                         continue;
 223                                 }
 224
 225                                 if ( strncasecmp( left, "group", sizeof("group")-1 ) == 0 ) {
 226                                         char *name = NULL;
 227                                         char *value = NULL;
 228
 229                                         if( b->a_group_pat != NULL ) {
 230                                                 fprintf( stderr,
 231                                                         "%s: line %d: group pattern already specified.\n",
 232                                                         fname, lineno );
 233                                                 acl_usage();
 234                                         }
 235
 236                                         /* format of string is "group/objectClassValue/groupAttrName" */
 237                                         if ((value = strchr(left, '/')) != NULL) {
 238                                                 *value++ = '\0';
 239                                                 if (value && *value
 240                                                         && (name = strchr(value, '/')) != NULL)
 241                                                 {
 242                                                         *name++ = '\0';
 243                                                 }
 244                                         }
 245
 246                                         regtest(fname, lineno, right);
 247                                         b->a_group_pat = ch_strdup( right );
 248
 249                                         if (value && *value) {
 250                                                 b->a_group_oc = ch_strdup(value);
 251                                                 *--value = '/';
 252                                         } else {
 253                                                 b->a_group_oc = ch_strdup("groupOfNames");
 254
 255                                                 if (name && *name) {
 256                                                         b->a_group_at = ch_strdup(name);
 257                                                         *--name = '/';
 258
 259                                                 } else {
 260                                                         b->a_group_at = ch_strdup("member");
 261                                                 }
 262                                         }
 263                                         continue;
 264                                 }
 265
 266                                 if ( strcasecmp( left, "peername" ) == 0 ) {
 267                                         if( b->a_peername_pat != NULL ) {
 268                                                 fprintf( stderr,
 269                                                         "%s: line %d: peername pattern already specified.\n",
 270                                                         fname, lineno );
 271                                                 acl_usage();
 272                                         }
 273
 274                                         regtest(fname, lineno, right);
 275                                         b->a_peername_pat = ch_strdup( right );
 276                                         continue;
 277                                 }
 278
 279                                 if ( strcasecmp( left, "sockname" ) == 0 ) {
 280                                         if( b->a_sockname_pat != NULL ) {
 281                                                 fprintf( stderr,
 282                                                         "%s: line %d: sockname pattern already specified.\n",
 283                                                         fname, lineno );
 284                                                 acl_usage();
 285                                         }
 286
 287                                         regtest(fname, lineno, right);
 288                                         b->a_sockname_pat = ch_strdup( right );
 289                                         continue;
 290                                 }
 291
 292                                 if ( strcasecmp( left, "domain" ) == 0 ) {
 293                                         if( b->a_domain_pat != NULL ) {
 294                                                 fprintf( stderr,
 295                                                         "%s: line %d: domain pattern already specified.\n",
 296                                                         fname, lineno );
 297                                                 acl_usage();
 298                                         }
 299
 300                                         regtest(fname, lineno, right);
 301                                         b->a_domain_pat = ch_strdup( right );
 302                                         continue;
 303                                 }
 304
 305                                 if ( strcasecmp( left, "url" ) == 0 ) {
 306                                         if( b->a_url_pat != NULL ) {
 307                                                 fprintf( stderr,
 308                                                         "%s: line %d: url pattern already specified.\n",
 309                                                         fname, lineno );
 310                                                 acl_usage();
 311                                         }
 312
 313                                         regtest(fname, lineno, right);
 314                                         b->a_url_pat = ch_strdup( right );
 315                                         continue;
 316                                 }
 317
 318                                 /* get <access> */
 319                                 if ( ACL_IS_INVALID(ACL_SET(b->a_access, str2access( left ))) ) {
 320                                         fprintf( stderr,
 321                                         "%s: line %d: expecting <access> got \"%s\"\n",
 322                                                 fname, lineno, left );
 323                                         acl_usage();
 324                                 }
 325                                 access_append( &a->acl_access, b );
 326                                 break;
 327                         }
 328                 } else {
 329                         fprintf( stderr,
 330                     "%s: line %d: expecting \"to\" or \"by\" got \"%s\"\n",
 331                             fname, lineno, argv[i] );
 332                         acl_usage();
 333                 }
 334         }
 335
 336         /* if we have no real access clause, complain and do nothing */
 337         if ( a == NULL ) {
 338                         fprintf( stderr,
 339                                 "%s: line %d: warning: no access clause(s) specified in access line\n",
 340                             fname, lineno );
 341
 342         } else {
 343
 344 #ifdef LDAP_DEBUG
 345                 if (ldap_debug & LDAP_DEBUG_ACL)
 346                     print_acl(a);
 347 #endif
 348
 349                 if ( a->acl_access == NULL ) {
 350                         fprintf( stderr,
 351                         "%s: line %d: warning: no by clause(s) specified in access line\n",
 352                             fname, lineno );
 353                 }
 354
 355                 if ( be != NULL ) {
 356                         acl_append( &be->be_acl, a );
 357                 } else {
 358                         acl_append( &global_acl, a );
 359                 }
 360         }
 361 }
 362
 363 char *
 364 access2str( int access )
 365 {
 366         static char     buf[12];
 367
 368         if ( ACL_IS_SELF( access ) ) {
 369                 strcpy( buf, "self" );
 370         } else {
 371                 buf[0] = '\0';
 372         }
 373
 374         if ( ACL_IS_NONE(access) ) {
 375                 strcat( buf, "none" );
 376         } else if ( ACL_IS_AUTH(access) ) {
 377                 strcat( buf, "auth" );
 378         } else if ( ACL_IS_COMPARE(access) ) {
 379                 strcat( buf, "compare" );
 380         } else if ( ACL_IS_SEARCH(access) ) {
 381                 strcat( buf, "search" );
 382         } else if ( ACL_IS_READ(access) ) {
 383                 strcat( buf, "read" );
 384         } else if ( ACL_IS_WRITE(access) ) {
 385                 strcat( buf, "write" );
 386
 387         } else {
 388                 strcat( buf, "unknown" );
 389         }
 390
 391         return( buf );
 392 }
 393
 394 int
 395 str2access( char *str )
 396 {
 397         int     access;
 398
 399         ACL_CLR(access);
 400
 401         if ( strncasecmp( str, "self", 4 ) == 0 ) {
 402                 ACL_SET_SELF(access);
 403                 str += 4;
 404         }
 405
 406         if ( strcasecmp( str, "none" ) == 0 ) {
 407                 ACL_SET_NONE(access);
 408         } else if ( strcasecmp( str, "auth" ) == 0 ) {
 409                 ACL_SET_AUTH(access);
 410         } else if ( strcasecmp( str, "compare" ) == 0 ) {
 411                 ACL_SET_COMPARE(access);
 412         } else if ( strcasecmp( str, "search" ) == 0 ) {
 413                 ACL_SET_SEARCH(access);
 414         } else if ( strcasecmp( str, "read" ) == 0 ) {
 415                 ACL_SET_READ(access);
 416         } else if ( strcasecmp( str, "write" ) == 0 ) {
 417                 ACL_SET_WRITE(access);
 418         } else {
 419                 ACL_SET_INVALID(access);
 420         }
 421
 422         return( access );
 423 }
 424
 425 static void
 426 acl_usage( void )
 427 {
 428         fprintf( stderr, "\n"
 429                 "<access clause> ::= access to <what> [ by <who> <access> ]+ \n"
 430                 "<what> ::= * | [dn=<regex>] [filter=<ldapfilter>] [attrs=<attrlist>]\n"
 431                 "<attrlist> ::= <attr> | <attr> , <attrlist>\n"
 432                 "<attr> ::= <attrname> | entry | children\n"
 433                 "<who> ::= * | anonymous | self | dn=<regex>\n"
 434                         "\t| dnattr=<attrname> | group[/<objectclass>[/<attrname>]]=<regex>\n"
 435                         "\t| peername=<regex> | sockname=<regex>\n"
 436                         "\t| domain=<regex> | sockurl=<regex>\n"
 437                 "<access> ::= [self]{none|auth|compare|search|read|write}\n"
 438                 );
 439         exit( 1 );
 440 }
 441
 442 static void
 443 split(
 444     char        *line,
 445     int         splitchar,
 446     char        **left,
 447     char        **right
 448 )
 449 {
 450         *left = line;
 451         if ( (*right = strchr( line, splitchar )) != NULL ) {
 452                 *((*right)++) = '\0';
 453         }
 454 }
 455
 456 static void
 457 access_append( Access **l, Access *a )
 458 {
 459         for ( ; *l != NULL; l = &(*l)->a_next )
 460                 ;       /* NULL */
 461
 462         *l = a;
 463 }
 464
 465 static void
 466 acl_append( AccessControl **l, AccessControl *a )
 467 {
 468         for ( ; *l != NULL; l = &(*l)->acl_next )
 469                 ;       /* NULL */
 470
 471         *l = a;
 472 }
 473
 474 #ifdef LDAP_DEBUG
 475
 476 static void
 477 print_access( Access *b )
 478 {
 479         fprintf( stderr, "\tby" );
 480
 481         if ( b->a_dn_pat != NULL ) {
 482                 if( strcmp(b->a_dn_pat, "anonymous") == 0 ) {
 483                         fprintf( stderr, " anonymous" );
 484
 485                 } else if( strcmp(b->a_dn_pat, "self") == 0 ) {
 486                         fprintf( stderr, " self" );
 487
 488                 } else {
 489                         fprintf( stderr, " dn=%s", b->a_dn_pat );
 490                 }
 491         }
 492
 493         if ( b->a_dn_at != NULL ) {
 494                 fprintf( stderr, " dnattr=%s", b->a_dn_at );
 495         }
 496
 497         if ( b->a_group_pat != NULL ) {
 498                 fprintf( stderr, " group: %s", b->a_group_pat );
 499
 500                 if ( b->a_group_oc ) {
 501                         fprintf( stderr, " objectClass: %s", b->a_group_oc );
 502
 503                         if ( b->a_group_at ) {
 504                                 fprintf( stderr, " attributeType: %s", b->a_group_at );
 505                         }
 506                 }
 507     }
 508
 509         if ( b->a_peername_pat != NULL ) {
 510                 fprintf( stderr, " peername=%s", b->a_peername_pat );
 511         }
 512         if ( b->a_sockname_pat != NULL ) {
 513                 fprintf( stderr, " sockname=%s", b->a_sockname_pat );
 514         }
 515
 516         if ( b->a_domain_pat != NULL ) {
 517                 fprintf( stderr, " domain=%s", b->a_domain_pat );
 518         }
 519
 520         if ( b->a_url_pat != NULL ) {
 521                 fprintf( stderr, " url=%s", b->a_url_pat );
 522         }
 523
 524         fprintf( stderr, "\n" );
 525 }
 526
 527 static void
 528 print_acl( AccessControl *a )
 529 {
 530         int             i;
 531         Access  *b;
 532
 533         if ( a == NULL ) {
 534                 fprintf( stderr, "NULL\n" );
 535         }
 536         fprintf( stderr, "ACL: access to" );
 537         if ( a->acl_filter != NULL ) {
 538                 fprintf(  stderr," filter=" );
 539                 filter_print( a->acl_filter );
 540         }
 541         if ( a->acl_dn_pat != NULL ) {
 542                 fprintf( stderr, " dn=" );
 543                 fprintf( stderr, a->acl_dn_pat );
 544         }
 545         if ( a->acl_attrs != NULL ) {
 546                 int     first = 1;
 547
 548                 fprintf( stderr, "\n attrs=" );
 549                 for ( i = 0; a->acl_attrs[i] != NULL; i++ ) {
 550                         if ( ! first ) {
 551                                 fprintf( stderr, "," );
 552                         }
 553                         fprintf( stderr, a->acl_attrs[i] );
 554                         first = 0;
 555                 }
 556         }
 557         fprintf( stderr, "\n" );
 558         for ( b = a->acl_access; b != NULL; b = b->a_next ) {
 559                 print_access( b );
 560         }
 561         fprintf( stderr, "\n" );
 562 }
 563
 564 #endif /* LDAP_DEBUG */