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(struct acl **l, struct acl *a);
  17 static void             access_append(struct access **l, struct access *a);
  18 static void             acl_usage(void);
  19 #ifdef LDAP_DEBUG
  20 static void             print_acl(struct acl *a);
  21 static void             print_access(struct 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         struct acl      *a;
  92         struct 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 = (struct acl *) ch_calloc( 1, sizeof(struct acl) );
 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                                         int e;
 113                                         if ((e = regcomp( &a->acl_dnre, ".*",
 114                                                 REG_EXTENDED|REG_ICASE)))
 115                                         {
 116                                                 char buf[512];
 117                                                 regerror(e, &a->acl_dnre, buf, sizeof(buf));
 118                                                 fprintf( stderr,
 119                                                         "%s: line %d: regular expression \"%s\" bad because of %s\n",
 120                                                         fname, lineno, right, buf );
 121                                                 acl_usage();
 122                                         }
 123                                         a->acl_dnpat = ch_strdup( ".*" );
 124                                         continue;
 125                                 }
 126
 127                                 split( argv[i], '=', &left, &right );
 128                                 if ( right == NULL || *right == '\0' ) {
 129                                         fprintf( stderr,
 130         "%s: line %d: missing \"=\" in (or value after) \"%s\" in to clause\n",
 131                                             fname, lineno, left );
 132                                         acl_usage();
 133                                 }
 134
 135                                 if ( strcasecmp( left, "filter" ) == 0 ) {
 136                                         if ( (a->acl_filter = str2filter(
 137                                             right )) == NULL ) {
 138                                                 fprintf( stderr,
 139                                 "%s: line %d: bad filter \"%s\" in to clause\n",
 140                                                     fname, lineno, right );
 141                                                 acl_usage();
 142                                         }
 143                                 } else if ( strcasecmp( left, "dn" ) == 0 ) {
 144                                         int e;
 145                                         if ((e = regcomp(&a->acl_dnre, right,
 146                                                 REG_EXTENDED|REG_ICASE))) {
 147                                                 char buf[512];
 148                                                 regerror(e, &a->acl_dnre, buf, sizeof(buf));
 149                                                 fprintf( stderr,
 150                                 "%s: line %d: regular expression \"%s\" bad because of %s\n",
 151                                                         fname, lineno, right, buf );
 152                                                 acl_usage();
 153
 154                                         } else {
 155                                                 a->acl_dnpat = dn_upcase(ch_strdup( right ));
 156                                         }
 157                                 } else if ( strncasecmp( left, "attr", 4 )
 158                                     == 0 ) {
 159                                         char    **alist;
 160
 161                                         alist = str2charray( right, "," );
 162                                         charray_merge( &a->acl_attrs, alist );
 163                                         charray_free( alist );
 164                                 } else {
 165                                         fprintf( stderr,
 166                                                 "%s: line %d: expecting <what> got \"%s\"\n",
 167                                             fname, lineno, left );
 168                                         acl_usage();
 169                                 }
 170                         }
 171
 172                 /* by clause - select who has what access to entries */
 173                 } else if ( strcasecmp( argv[i], "by" ) == 0 ) {
 174                         if ( a == NULL ) {
 175                                 fprintf( stderr,
 176                                         "%s: line %d: to clause required before by clause in access line\n",
 177                                     fname, lineno );
 178                                 acl_usage();
 179                         }
 180                         /*
 181                          * by clause consists of <who> and <access>
 182                          */
 183
 184                         b = (struct access *) ch_calloc( 1, sizeof(struct access) );
 185
 186                         if ( ++i == argc ) {
 187                                 fprintf( stderr,
 188                             "%s: line %d: premature eol: expecting <who>\n",
 189                                     fname, lineno );
 190                                 acl_usage();
 191                         }
 192
 193                         /* get <who> */
 194                         split( argv[i], '=', &left, &right );
 195                         if ( strcasecmp( argv[i], "*" ) == 0 ) {
 196                                 b->a_dnpat = ch_strdup( ".*" );
 197                         } else if ( strcasecmp( argv[i], "anonymous" ) == 0 ) {
 198                                 b->a_dnpat = ch_strdup( "anonymous" );
 199                         } else if ( strcasecmp( argv[i], "self" ) == 0 ) {
 200                                 b->a_dnpat = ch_strdup( "self" );
 201                         } else if ( strcasecmp( left, "dn" ) == 0 ) {
 202                                 regtest(fname, lineno, right);
 203                                 b->a_dnpat = dn_upcase( ch_strdup( right ) );
 204                         } else if ( strcasecmp( left, "dnattr" ) == 0 ) {
 205                                 b->a_dnattr = ch_strdup( right );
 206
 207                         } else if ( strncasecmp( left, "group", sizeof("group")-1 ) == 0 ) {
 208                                 char *name = NULL;
 209                                 char *value = NULL;
 210
 211                                 /* format of string is "group/objectClassValue/groupAttrName" */
 212                                 if ((value = strchr(left, '/')) != NULL) {
 213                                         *value++ = '\0';
 214                                         if (value && *value
 215                                                 && (name = strchr(value, '/')) != NULL)
 216                                         {
 217                                                 *name++ = '\0';
 218                                         }
 219                                 }
 220
 221                                 regtest(fname, lineno, right);
 222                                 b->a_group = dn_upcase(ch_strdup( right ));
 223
 224                                 if (value && *value) {
 225                                         b->a_group_oc = ch_strdup(value);
 226                                         *--value = '/';
 227                                 } else {
 228                                         b->a_group_oc = ch_strdup("groupOfNames");
 229
 230                                         if (name && *name) {
 231                                                 b->a_group_at = ch_strdup(name);
 232                                                 *--name = '/';
 233
 234                                         } else {
 235                                                 b->a_group_at = ch_strdup("member");
 236                                         }
 237                                 }
 238
 239                         } else if ( strcasecmp( left, "domain" ) == 0 ) {
 240                                 char    *s;
 241                                 regtest(fname, lineno, right);
 242                                 b->a_domainpat = ch_strdup( right );
 243
 244                                 /* normalize the domain */
 245                                 for ( s = b->a_domainpat; *s; s++ ) {
 246                                         *s = TOLOWER( (unsigned char) *s );
 247                                 }
 248                         } else if ( strcasecmp( left, "addr" ) == 0 ) {
 249                                 regtest(fname, lineno, right);
 250                                 b->a_addrpat = ch_strdup( right );
 251                         } else {
 252                                 fprintf( stderr,
 253                                     "%s: line %d: expecting <who> got \"%s\"\n",
 254                                     fname, lineno, left );
 255                                 acl_usage();
 256                         }
 257
 258                         if ( ++i == argc ) {
 259                                 fprintf( stderr,
 260                             "%s: line %d: premature eol: expecting <access>\n",
 261                                     fname, lineno );
 262                                 acl_usage();
 263                         }
 264
 265                         /* get <access> */
 266                         split( argv[i], '=', &left, &right );
 267                         if ( ACL_IS_INVALID(ACL_SET(b->a_access,str2access( left ))) ) {
 268                                 fprintf( stderr,
 269                             "%s: line %d: expecting <access> got \"%s\"\n",
 270                                     fname, lineno, left );
 271                                 acl_usage();
 272                         }
 273                         access_append( &a->acl_access, b );
 274
 275                 } else {
 276                         fprintf( stderr,
 277                     "%s: line %d: expecting \"to\" or \"by\" got \"%s\"\n",
 278                             fname, lineno, argv[i] );
 279                         acl_usage();
 280                 }
 281         }
 282
 283         /* if we have no real access clause, complain and do nothing */
 284         if ( a == NULL ) {
 285                         fprintf( stderr,
 286                                 "%s: line %d: warning: no access clause(s) specified in access line\n",
 287                             fname, lineno );
 288
 289         } else {
 290
 291 #ifdef LDAP_DEBUG
 292                 if (ldap_debug & LDAP_DEBUG_ACL)
 293                     print_acl(a);
 294 #endif
 295
 296                 if ( a->acl_access == NULL ) {
 297                         fprintf( stderr,
 298                         "%s: line %d: warning: no by clause(s) specified in access line\n",
 299                             fname, lineno );
 300                 }
 301
 302                 if ( be != NULL ) {
 303                         acl_append( &be->be_acl, a );
 304                 } else {
 305                         acl_append( &global_acl, a );
 306                 }
 307         }
 308 }
 309
 310 char *
 311 access2str( int access )
 312 {
 313         static char     buf[12];
 314
 315         if ( ACL_IS_SELF( access ) ) {
 316                 strcpy( buf, "self" );
 317         } else {
 318                 buf[0] = '\0';
 319         }
 320
 321         if ( ACL_IS_NONE(access) ) {
 322                 strcat( buf, "none" );
 323         } else if ( ACL_IS_AUTH(access) ) {
 324                 strcat( buf, "auth" );
 325         } else if ( ACL_IS_COMPARE(access) ) {
 326                 strcat( buf, "compare" );
 327         } else if ( ACL_IS_SEARCH(access) ) {
 328                 strcat( buf, "search" );
 329         } else if ( ACL_IS_READ(access) ) {
 330                 strcat( buf, "read" );
 331         } else if ( ACL_IS_WRITE(access) ) {
 332                 strcat( buf, "write" );
 333
 334         } else {
 335                 strcat( buf, "unknown" );
 336         }
 337
 338         return( buf );
 339 }
 340
 341 int
 342 str2access( char *str )
 343 {
 344         int     access;
 345
 346         ACL_CLR(access);
 347
 348         if ( strncasecmp( str, "self", 4 ) == 0 ) {
 349                 ACL_SET_SELF(access);
 350                 str += 4;
 351         }
 352
 353         if ( strcasecmp( str, "none" ) == 0 ) {
 354                 ACL_SET_NONE(access);
 355         } else if ( strcasecmp( str, "auth" ) == 0 ) {
 356                 ACL_SET_AUTH(access);
 357         } else if ( strcasecmp( str, "compare" ) == 0 ) {
 358                 ACL_SET_COMPARE(access);
 359         } else if ( strcasecmp( str, "search" ) == 0 ) {
 360                 ACL_SET_SEARCH(access);
 361         } else if ( strcasecmp( str, "read" ) == 0 ) {
 362                 ACL_SET_READ(access);
 363         } else if ( strcasecmp( str, "write" ) == 0 ) {
 364                 ACL_SET_WRITE(access);
 365         } else {
 366                 ACL_SET_INVALID(access);
 367         }
 368
 369         return( access );
 370 }
 371
 372 static void
 373 acl_usage( void )
 374 {
 375         fprintf( stderr, "\n"
 376                 "<access clause> ::= access to <what> [ by <who> <access> ]+ \n"
 377                 "<what> ::= * | [dn=<regex>] [filter=<ldapfilter>] [attrs=<attrlist>]\n"
 378                 "<attrlist> ::= <attr> | <attr> , <attrlist>\n"
 379                 "<attr> ::= <attrname> | entry | children\n"
 380                 "<who> ::= * | anonymous | self | dn=<regex> | addr=<regex>\n"
 381                         "\t| domain=<regex> | dnattr=<dnattrname>\n"
 382                         "\t| group[/<objectclass>[/<attrname>]]=<regex>\n"
 383                 "<access> ::= [self]{none|auth|compare|search|read|write}\n"
 384                 );
 385         exit( 1 );
 386 }
 387
 388 static void
 389 split(
 390     char        *line,
 391     int         splitchar,
 392     char        **left,
 393     char        **right
 394 )
 395 {
 396         *left = line;
 397         if ( (*right = strchr( line, splitchar )) != NULL ) {
 398                 *((*right)++) = '\0';
 399         }
 400 }
 401
 402 static void
 403 access_append( struct access **l, struct access *a )
 404 {
 405         for ( ; *l != NULL; l = &(*l)->a_next )
 406                 ;       /* NULL */
 407
 408         *l = a;
 409 }
 410
 411 static void
 412 acl_append( struct acl **l, struct acl *a )
 413 {
 414         for ( ; *l != NULL; l = &(*l)->acl_next )
 415                 ;       /* NULL */
 416
 417         *l = a;
 418 }
 419
 420 #ifdef LDAP_DEBUG
 421
 422 static void
 423 print_access( struct access *b )
 424 {
 425         fprintf( stderr, "\tby" );
 426
 427         if ( b->a_dnpat != NULL ) {
 428                 if( strcmp(b->a_dnpat, "anonymous") == 0 ) {
 429                         fprintf( stderr, " anonymous" );
 430                 } else if( strcmp(b->a_dnpat, "self") == 0 ) {
 431                         fprintf( stderr, " self" );
 432                 } else {
 433                         fprintf( stderr, " dn=%s", b->a_dnpat );
 434                 }
 435         } else if ( b->a_addrpat != NULL ) {
 436                 fprintf( stderr, " addr=%s", b->a_addrpat );
 437         } else if ( b->a_domainpat != NULL ) {
 438                 fprintf( stderr, " domain=%s", b->a_domainpat );
 439         } else if ( b->a_dnattr != NULL ) {
 440                 fprintf( stderr, " dnattr=%s", b->a_dnattr );
 441         } else if ( b->a_group != NULL ) {
 442                 fprintf( stderr, " group: %s", b->a_group );
 443                 if ( b->a_group_oc ) {
 444                         fprintf( stderr, " objectClass: %s", b->a_group_oc );
 445                         if ( b->a_group_at ) {
 446                                 fprintf( stderr, " attributeType: %s", b->a_group_at );
 447                         }
 448                 }
 449     }
 450         fprintf( stderr, "\n" );
 451 }
 452
 453 static void
 454 print_acl( struct acl *a )
 455 {
 456         int             i;
 457         struct access   *b;
 458
 459         if ( a == NULL ) {
 460                 fprintf( stderr, "NULL\n" );
 461         }
 462         fprintf( stderr, "ACL: access to" );
 463         if ( a->acl_filter != NULL ) {
 464                 fprintf(  stderr," filter=" );
 465                 filter_print( a->acl_filter );
 466         }
 467         if ( a->acl_dnpat != NULL ) {
 468                 fprintf( stderr, " dn=" );
 469                 fprintf( stderr, a->acl_dnpat );
 470         }
 471         if ( a->acl_attrs != NULL ) {
 472                 int     first = 1;
 473
 474                 fprintf( stderr, "\n attrs=" );
 475                 for ( i = 0; a->acl_attrs[i] != NULL; i++ ) {
 476                         if ( ! first ) {
 477                                 fprintf( stderr, "," );
 478                         }
 479                         fprintf( stderr, a->acl_attrs[i] );
 480                         first = 0;
 481                 }
 482         }
 483         fprintf( stderr, "\n" );
 484         for ( b = a->acl_access; b != NULL; b = b->a_next ) {
 485                 print_access( b );
 486         }
 487         fprintf( stderr, "\n" );
 488 }
 489
 490 #endif /* LDAP_DEBUG */