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                 if (ldap_debug&LDAP_DEBUG_ACL)
 297                     print_acl(a);
 298
 299
 300                 if ( a->acl_access == NULL ) {
 301                         fprintf( stderr,
 302                         "%s: line %d: warning: no by clause(s) specified in access line\n",
 303                             fname, lineno );
 304                 }
 305
 306                 if ( be != NULL ) {
 307                         acl_append( &be->be_acl, a );
 308                 } else {
 309                         acl_append( &global_acl, a );
 310                 }
 311         }
 312 }
 313
 314 char *
 315 access2str( int access )
 316 {
 317         static char     buf[12];
 318
 319         if ( access & ACL_SELF ) {
 320                 strcpy( buf, "self" );
 321         } else {
 322                 buf[0] = '\0';
 323         }
 324
 325         if ( access & ACL_NONE ) {
 326                 strcat( buf, "none" );
 327         } else if ( access & ACL_COMPARE ) {
 328                 strcat( buf, "compare" );
 329         } else if ( access & ACL_SEARCH ) {
 330                 strcat( buf, "search" );
 331         } else if ( access & ACL_READ ) {
 332                 strcat( buf, "read" );
 333         } else if ( access & ACL_WRITE ) {
 334                 strcat( buf, "write" );
 335         } else {
 336                 strcat( buf, "unknown" );
 337         }
 338
 339         return( buf );
 340 }
 341
 342 int
 343 str2access( char *str )
 344 {
 345         int     access;
 346
 347         access = 0;
 348         if ( strncasecmp( str, "self", 4 ) == 0 ) {
 349                 access |= ACL_SELF;
 350                 str += 4;
 351         }
 352
 353         if ( strcasecmp( str, "none" ) == 0 ) {
 354                 access |= ACL_NONE;
 355         } else if ( strcasecmp( str, "compare" ) == 0 ) {
 356                 access |= ACL_COMPARE;
 357         } else if ( strcasecmp( str, "search" ) == 0 ) {
 358                 access |= ACL_SEARCH;
 359         } else if ( strcasecmp( str, "read" ) == 0 ) {
 360                 access |= ACL_READ;
 361         } else if ( strcasecmp( str, "write" ) == 0 ) {
 362                 access |= ACL_WRITE;
 363         } else {
 364                 access = -1;
 365         }
 366
 367         return( access );
 368 }
 369
 370 static void
 371 acl_usage()
 372 {
 373         fprintf( stderr, "\n<access clause> ::= access to <what> [ by <who> <access> ]+ \n" );
 374         fprintf( stderr, "<what> ::= * | [dn=<regex>] [filter=<ldapfilter>] [attrs=<attrlist>]\n" );
 375         fprintf( stderr, "<attrlist> ::= <attr> | <attr> , <attrlist>\n" );
 376         fprintf( stderr, "<attr> ::= <attrname> | entry | children\n" );
 377         fprintf( stderr, "<who> ::= * | self | dn=<regex> | addr=<regex> |\n\tdomain=<regex> | dnattr=<dnattrname>\n" );
 378         fprintf( stderr, "<access> ::= [self]{none | compare | search | read | write }\n" );
 379         exit( 1 );
 380 }
 381
 382 static void
 383 split(
 384     char        *line,
 385     int         splitchar,
 386     char        **left,
 387     char        **right
 388 )
 389 {
 390         *left = line;
 391         if ( (*right = strchr( line, splitchar )) != NULL ) {
 392                 *((*right)++) = '\0';
 393         }
 394 }
 395
 396 static void
 397 access_append( struct access **l, struct access *a )
 398 {
 399         for ( ; *l != NULL; l = &(*l)->a_next )
 400                 ;       /* NULL */
 401
 402         *l = a;
 403 }
 404
 405 static void
 406 acl_append( struct acl **l, struct acl *a )
 407 {
 408         for ( ; *l != NULL; l = &(*l)->acl_next )
 409                 ;       /* NULL */
 410
 411         *l = a;
 412 }
 413
 414 #ifdef LDAP_DEBUG
 415
 416 static void
 417 print_access( struct access *b )
 418 {
 419         printf( "\tby" );
 420         if ( b->a_dnpat != NULL ) {
 421                 fprintf( stderr, " dn=%s", b->a_dnpat );
 422         } else if ( b->a_addrpat != NULL ) {
 423                 fprintf( stderr, " addr=%s", b->a_addrpat );
 424         } else if ( b->a_domainpat != NULL ) {
 425                 fprintf( stderr, " domain=%s", b->a_domainpat );
 426         } else if ( b->a_dnattr != NULL ) {
 427                 fprintf( stderr, " dnattr=%s", b->a_dnattr );
 428         }
 429 #ifdef SLAPD_ACLGROUPS
 430         else if ( b->a_group != NULL ) {
 431                 fprintf( stderr, " group: %s", b->a_group );
 432                 if ( b->a_objectclassvalue )
 433                         fprintf( stderr, " objectClassValue: %s", b->a_objectclassvalue );
 434                 if ( b->a_groupattrname )
 435                         fprintf( stderr, " groupAttrName: %s", b->a_groupattrname );
 436         }
 437 #endif
 438         fprintf( stderr, "\n" );
 439 }
 440
 441 static void
 442 print_acl( struct acl *a )
 443 {
 444         int             i;
 445         struct access   *b;
 446
 447         if ( a == NULL ) {
 448                 fprintf( stderr, "NULL\n" );
 449         }
 450         fprintf( stderr, "ACL: access to" );
 451         if ( a->acl_filter != NULL ) {
 452                 fprintf(  stderr," filter=" );
 453                 filter_print( a->acl_filter );
 454         }
 455         if ( a->acl_dnpat != NULL ) {
 456                 fprintf( stderr, " dn=" );
 457                 fprintf( stderr, a->acl_dnpat );
 458         }
 459         if ( a->acl_attrs != NULL ) {
 460                 int     first = 1;
 461
 462                 fprintf( stderr, "\n attrs=" );
 463                 for ( i = 0; a->acl_attrs[i] != NULL; i++ ) {
 464                         if ( ! first ) {
 465                                 fprintf( stderr, "," );
 466                         }
 467                         fprintf( stderr, a->acl_attrs[i] );
 468                         first = 0;
 469                 }
 470         }
 471         fprintf( stderr, "\n" );
 472         for ( b = a->acl_access; b != NULL; b = b->a_next ) {
 473                 print_access( b );
 474         }
 475         fprintf( stderr, "\n" );
 476 }
 477
 478 #endif /* LDAP_DEBUG */