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 extern Filter           *str2filter();
  16 extern struct acl       *global_acl;
  17 extern char             **str2charray();
  18 extern char             *dn_upcase();
  19
  20 static void             split();
  21 static void             acl_append();
  22 static void             access_append();
  23 static void             acl_usage();
  24 #ifdef LDAP_DEBUG
  25 static void             print_acl();
  26 static void             print_access();
  27 #endif
  28
  29 int
  30 regtest(char *fname, int lineno, char *pat) {
  31         int e;
  32         regex_t re;
  33
  34         char buf[512];
  35         int size;
  36
  37         char *sp;
  38         char *dp;
  39         int  flag;
  40
  41         sp = pat;
  42         dp = buf;
  43         size = 0;
  44         buf[0] = '\0';
  45
  46         for (size = 0, flag = 0; (size < sizeof(buf)) && *sp; sp++) {
  47                 if (flag) {
  48                         if (*sp == '$'|| (*sp >= '0' && *sp <= '9')) {
  49                                 *dp++ = *sp;
  50                                 size++;
  51                         }
  52                         flag = 0;
  53
  54                 } else {
  55                         if (*sp == '$') {
  56                                 flag = 1;
  57                         } else {
  58                                 *dp++ = *sp;
  59                                 size++;
  60                         }
  61                 }
  62         }
  63
  64         *dp = '\0';
  65         if ( size >= (sizeof(buf)-1) ) {
  66                 fprintf( stderr,
  67                         "%s: line %d: regular expression \"%s\" too large\n",
  68                         fname, lineno, pat, 0 );
  69                 acl_usage();
  70         }
  71
  72         if ((e = regcomp(&re, buf, REG_EXTENDED|REG_ICASE))) {
  73                 char error[512];
  74                 regerror(e, &re, error, sizeof(error));
  75                 fprintf( stderr,
  76                         "%s: line %d: regular expression \"%s\" bad because of %s\n",
  77                         fname, lineno, pat, error );
  78                 acl_usage();
  79                 return(0);
  80         }
  81         regfree(&re);
  82         return(1);
  83 }
  84
  85 void
  86 parse_acl(
  87     Backend     *be,
  88     char        *fname,
  89     int         lineno,
  90     int         argc,
  91     char        **argv
  92 )
  93 {
  94         int             i;
  95         char            *e, *left, *right;
  96         struct acl      *a;
  97         struct access   *b;
  98
  99         a = NULL;
 100         for ( i = 1; i < argc; i++ ) {
 101                 /* to clause - select which entries are protected */
 102                 if ( strcasecmp( argv[i], "to" ) == 0 ) {
 103                         if ( a != NULL ) {
 104                                 fprintf( stderr,
 105                 "%s: line %d: only one to clause allowed in access line\n",
 106                                     fname, lineno );
 107                                 acl_usage();
 108                         }
 109                         a = (struct acl *) ch_calloc( 1, sizeof(struct acl) );
 110                         for ( ++i; i < argc; i++ ) {
 111                                 if ( strcasecmp( argv[i], "by" ) == 0 ) {
 112                                         i--;
 113                                         break;
 114                                 }
 115
 116                                 if ( strcasecmp( argv[i], "*" ) == 0 ) {
 117                                         int e;
 118                                         if ((e = regcomp( &a->acl_dnre, ".*",
 119                                                 REG_EXTENDED|REG_ICASE)))
 120                                         {
 121                                                 char buf[512];
 122                                                 regerror(e, &a->acl_dnre, buf, sizeof(buf));
 123                                                 fprintf( stderr,
 124                                                         "%s: line %d: regular expression \"%s\" bad because of %s\n",
 125                                                         fname, lineno, right, buf );
 126                                                 acl_usage();
 127                                         }
 128                                         a->acl_dnpat = strdup( ".*" );
 129                                         continue;
 130                                 }
 131
 132                                 split( argv[i], '=', &left, &right );
 133                                 if ( right == NULL || *right == '\0' ) {
 134                                         fprintf( stderr,
 135         "%s: line %d: missing \"=\" in (or value after) \"%s\" in to clause\n",
 136                                             fname, lineno, left );
 137                                         acl_usage();
 138                                 }
 139
 140                                 if ( strcasecmp( left, "filter" ) == 0 ) {
 141                                         if ( (a->acl_filter = str2filter(
 142                                             right )) == NULL ) {
 143                                                 fprintf( stderr,
 144                                 "%s: line %d: bad filter \"%s\" in to clause\n",
 145                                                     fname, lineno, right );
 146                                                 acl_usage();
 147                                         }
 148                                 } else if ( strcasecmp( left, "dn" ) == 0 ) {
 149                                         int e;
 150                                         if ((e = regcomp(&a->acl_dnre, right,
 151                                                 REG_EXTENDED|REG_ICASE))) {
 152                                                 char buf[512];
 153                                                 regerror(e, &a->acl_dnre, buf, sizeof(buf));
 154                                                 fprintf( stderr,
 155                                 "%s: line %d: regular expression \"%s\" bad because of %s\n",
 156                                                         fname, lineno, right, buf );
 157                                                 acl_usage();
 158
 159                                         } else {
 160                                                 a->acl_dnpat = dn_upcase(strdup( right ));
 161                                         }
 162                                 } else if ( strncasecmp( left, "attr", 4 )
 163                                     == 0 ) {
 164                                         char    **alist;
 165
 166                                         alist = str2charray( right, "," );
 167                                         charray_merge( &a->acl_attrs, alist );
 168                                         free( alist );
 169                                 } else {
 170                                         fprintf( stderr,
 171                                                 "%s: line %d: expecting <what> got \"%s\"\n",
 172                                             fname, lineno, left );
 173                                         acl_usage();
 174                                 }
 175                         }
 176
 177                 /* by clause - select who has what access to entries */
 178                 } else if ( strcasecmp( argv[i], "by" ) == 0 ) {
 179                         if ( a == NULL ) {
 180                                 fprintf( stderr,
 181                                         "%s: line %d: to clause required before by clause in access line\n",
 182                                     fname, lineno );
 183                                 acl_usage();
 184                         }
 185                         /*
 186                          * by clause consists of <who> and <access>
 187                          */
 188
 189                         b = (struct access *) ch_calloc( 1,
 190                             sizeof(struct access) );
 191
 192                         if ( ++i == argc ) {
 193                                 fprintf( stderr,
 194                             "%s: line %d: premature eol: expecting <who>\n",
 195                                     fname, lineno );
 196                                 acl_usage();
 197                         }
 198
 199                         /* get <who> */
 200                         split( argv[i], '=', &left, &right );
 201                         if ( strcasecmp( argv[i], "*" ) == 0 ) {
 202                                 b->a_dnpat = strdup( ".*" );
 203                         } else if ( strcasecmp( argv[i], "self" ) == 0 ) {
 204                                 b->a_dnpat = strdup( "self" );
 205                         } else if ( strcasecmp( left, "dn" ) == 0 ) {
 206                                 regtest(fname, lineno, right);
 207                                 b->a_dnpat = dn_upcase( strdup( right ) );
 208                         } else if ( strcasecmp( left, "dnattr" ) == 0 ) {
 209                                 b->a_dnattr = strdup( right );
 210
 211 #ifdef SLAPD_ACLGROUPS
 212                         } else if ( strcasecmp( left, "group" ) == 0 ) {
 213                                 char *name = NULL;
 214                                 char *value = NULL;
 215                                 regtest(fname, lineno, right);
 216
 217                                 /* format of string is "group/objectClassValue/groupAttrName"
 218                                  */
 219                                 if ((value = strchr(right, '/')) != NULL) {
 220                                         *value++ = '\0';
 221                                         if (value && *value && (name = strchr(value, '/')) != NULL)
 222                                             *name++ = '\0';
 223                                 }
 224
 225                                 b->a_group = dn_upcase(strdup( right ));
 226
 227                                 if (value && *value) {
 228                                         b->a_objectclassvalue = strdup(value);
 229                                         *--value = '/';
 230                                 }
 231                                 else
 232                                         b->a_objectclassvalue = strdup("groupOfNames");
 233
 234                                 if (name && *name) {
 235                                         b->a_groupattrname = strdup(name);
 236                                         *--name = '/';
 237                                 }
 238                                 else
 239                                         b->a_groupattrname = strdup("member");
 240
 241
 242
 243 #endif /* SLAPD_ACLGROUPS */
 244                         } else if ( strcasecmp( left, "domain" ) == 0 ) {
 245                                 char    *s;
 246                                 regtest(fname, lineno, right);
 247                                 b->a_domainpat = strdup( right );
 248
 249                                 /* normalize the domain */
 250                                 for ( s = b->a_domainpat; *s; s++ ) {
 251                                         *s = TOLOWER( *s );
 252                                 }
 253                         } else if ( strcasecmp( left, "addr" ) == 0 ) {
 254                                 regtest(fname, lineno, right);
 255                                 b->a_addrpat = strdup( right );
 256                         } else {
 257                                 fprintf( stderr,
 258                                     "%s: line %d: expecting <who> got \"%s\"\n",
 259                                     fname, lineno, left );
 260                                 acl_usage();
 261                         }
 262
 263                         if ( ++i == argc ) {
 264                                 fprintf( stderr,
 265                             "%s: line %d: premature eol: expecting <access>\n",
 266                                     fname, lineno );
 267                                 acl_usage();
 268                         }
 269
 270                         /* get <access> */
 271                         split( argv[i], '=', &left, &right );
 272                         if ( (b->a_access = str2access( left )) == -1 ) {
 273                                 fprintf( stderr,
 274                             "%s: line %d: expecting <access> got \"%s\"\n",
 275                                     fname, lineno, left );
 276                                 acl_usage();
 277                         }
 278                         access_append( &a->acl_access, b );
 279
 280                 } else {
 281                         fprintf( stderr,
 282                     "%s: line %d: expecting \"to\" or \"by\" got \"%s\"\n",
 283                             fname, lineno, argv[i] );
 284                         acl_usage();
 285                 }
 286         }
 287
 288         /* if we have no real access clause, complain and do nothing */
 289         if ( a == NULL ) {
 290                         fprintf( stderr,
 291                                 "%s: line %d: warning: no access clause(s) specified in access line\n",
 292                             fname, lineno );
 293
 294         } else {
 295
 296 #ifdef LDAP_DEBUG
 297                 if (ldap_debug & LDAP_DEBUG_ACL)
 298                         print_acl(a);
 299 #endif
 300
 301                 if ( a->acl_access == NULL ) {
 302                         fprintf( stderr,
 303                         "%s: line %d: warning: no by clause(s) specified in access line\n",
 304                             fname, lineno );
 305                 }
 306
 307                 if ( be != NULL ) {
 308                         acl_append( &be->be_acl, a );
 309                 } else {
 310                         acl_append( &global_acl, a );
 311                 }
 312         }
 313 }
 314
 315 char *
 316 access2str( int access )
 317 {
 318         static char     buf[12];
 319
 320         if ( access & ACL_SELF ) {
 321                 strcpy( buf, "self" );
 322         } else {
 323                 buf[0] = '\0';
 324         }
 325
 326         if ( access & ACL_NONE ) {
 327                 strcat( buf, "none" );
 328         } else if ( access & ACL_COMPARE ) {
 329                 strcat( buf, "compare" );
 330         } else if ( access & ACL_SEARCH ) {
 331                 strcat( buf, "search" );
 332         } else if ( access & ACL_READ ) {
 333                 strcat( buf, "read" );
 334         } else if ( access & ACL_WRITE ) {
 335                 strcat( buf, "write" );
 336         } else {
 337                 strcat( buf, "unknown" );
 338         }
 339
 340         return( buf );
 341 }
 342
 343 int
 344 str2access( char *str )
 345 {
 346         int     access;
 347
 348         access = 0;
 349         if ( strncasecmp( str, "self", 4 ) == 0 ) {
 350                 access |= ACL_SELF;
 351                 str += 4;
 352         }
 353
 354         if ( strcasecmp( str, "none" ) == 0 ) {
 355                 access |= ACL_NONE;
 356         } else if ( strcasecmp( str, "compare" ) == 0 ) {
 357                 access |= ACL_COMPARE;
 358         } else if ( strcasecmp( str, "search" ) == 0 ) {
 359                 access |= ACL_SEARCH;
 360         } else if ( strcasecmp( str, "read" ) == 0 ) {
 361                 access |= ACL_READ;
 362         } else if ( strcasecmp( str, "write" ) == 0 ) {
 363                 access |= ACL_WRITE;
 364         } else {
 365                 access = -1;
 366         }
 367
 368         return( access );
 369 }
 370
 371 static void
 372 acl_usage()
 373 {
 374         fprintf( stderr, "\n<access clause> ::= access to <what> [ by <who> <access> ]+ \n" );
 375         fprintf( stderr, "<what> ::= * | [dn=<regex>] [filter=<ldapfilter>] [attrs=<attrlist>]\n" );
 376         fprintf( stderr, "<attrlist> ::= <attr> | <attr> , <attrlist>\n" );
 377         fprintf( stderr, "<attr> ::= <attrname> | entry | children\n" );
 378         fprintf( stderr, "<who> ::= * | self | dn=<regex> | addr=<regex> |\n\tdomain=<regex> | dnattr=<dnattrname>\n" );
 379         fprintf( stderr, "<access> ::= [self]{none | compare | search | read | write }\n" );
 380         exit( 1 );
 381 }
 382
 383 static void
 384 split(
 385     char        *line,
 386     int         splitchar,
 387     char        **left,
 388     char        **right
 389 )
 390 {
 391         *left = line;
 392         if ( (*right = strchr( line, splitchar )) != NULL ) {
 393                 *((*right)++) = '\0';
 394         }
 395 }
 396
 397 static void
 398 access_append( struct access **l, struct access *a )
 399 {
 400         for ( ; *l != NULL; l = &(*l)->a_next )
 401                 ;       /* NULL */
 402
 403         *l = a;
 404 }
 405
 406 static void
 407 acl_append( struct acl **l, struct acl *a )
 408 {
 409         for ( ; *l != NULL; l = &(*l)->acl_next )
 410                 ;       /* NULL */
 411
 412         *l = a;
 413 }
 414
 415 #ifdef LDAP_DEBUG
 416
 417 static void
 418 print_access( struct access *b )
 419 {
 420         printf( "\tby" );
 421         if ( b->a_dnpat != NULL ) {
 422                 fprintf( stderr, " dn=%s", b->a_dnpat );
 423         } else if ( b->a_addrpat != NULL ) {
 424                 fprintf( stderr, " addr=%s", b->a_addrpat );
 425         } else if ( b->a_domainpat != NULL ) {
 426                 fprintf( stderr, " domain=%s", b->a_domainpat );
 427         } else if ( b->a_dnattr != NULL ) {
 428                 fprintf( stderr, " dnattr=%s", b->a_dnattr );
 429         }
 430 #ifdef SLAPD_ACLGROUPS
 431         else if ( b->a_group != NULL ) {
 432                 fprintf( stderr, " group: %s", b->a_group );
 433                 if ( b->a_objectclassvalue )
 434                         fprintf( stderr, " objectClassValue: %s", b->a_objectclassvalue );
 435                 if ( b->a_groupattrname )
 436                         fprintf( stderr, " groupAttrName: %s", b->a_groupattrname );
 437         }
 438 #endif
 439         fprintf( stderr, "\n" );
 440 }
 441
 442 static void
 443 print_acl( struct acl *a )
 444 {
 445         int             i;
 446         struct access   *b;
 447
 448         if ( a == NULL ) {
 449                 fprintf( stderr, "NULL\n" );
 450         }
 451         fprintf( stderr, "ACL: access to" );
 452         if ( a->acl_filter != NULL ) {
 453                 fprintf(  stderr," filter=" );
 454                 filter_print( a->acl_filter );
 455         }
 456         if ( a->acl_dnpat != NULL ) {
 457                 fprintf( stderr, " dn=" );
 458                 fprintf( stderr, a->acl_dnpat );
 459         }
 460         if ( a->acl_attrs != NULL ) {
 461                 int     first = 1;
 462
 463                 fprintf( stderr, "\n attrs=" );
 464                 for ( i = 0; a->acl_attrs[i] != NULL; i++ ) {
 465                         if ( ! first ) {
 466                                 fprintf( stderr, "," );
 467                         }
 468                         fprintf( stderr, a->acl_attrs[i] );
 469                         first = 0;
 470                 }
 471         }
 472         fprintf( stderr, "\n" );
 473         for ( b = a->acl_access; b != NULL; b = b->a_next ) {
 474                 print_access( b );
 475         }
 476         fprintf( stderr, "\n" );
 477 }
 478
 479 #endif /* LDAP_DEBUG */