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 ( strcmp( 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                                                 /* ### Should be normalized, but how? */
 156                                                 a->acl_dnpat = dn_upcase(ch_strdup( right ));
 157                                         }
 158                                 } else if ( strncasecmp( left, "attr", 4 )
 159                                     == 0 ) {
 160                                         char    **alist;
 161
 162                                         alist = str2charray( right, "," );
 163                                         charray_merge( &a->acl_attrs, alist );
 164                                         charray_free( alist );
 165                                 } else {
 166                                         fprintf( stderr,
 167                                                 "%s: line %d: expecting <what> got \"%s\"\n",
 168                                             fname, lineno, left );
 169                                         acl_usage();
 170                                 }
 171                         }
 172
 173                 /* by clause - select who has what access to entries */
 174                 } else if ( strcasecmp( argv[i], "by" ) == 0 ) {
 175                         if ( a == NULL ) {
 176                                 fprintf( stderr,
 177                                         "%s: line %d: to clause required before by clause in access line\n",
 178                                     fname, lineno );
 179                                 acl_usage();
 180                         }
 181                         /*
 182                          * by clause consists of <who> and <access>
 183                          */
 184
 185                         b = (struct access *) ch_calloc( 1, sizeof(struct access) );
 186
 187                         if ( ++i == argc ) {
 188                                 fprintf( stderr,
 189                             "%s: line %d: premature eol: expecting <who>\n",
 190                                     fname, lineno );
 191                                 acl_usage();
 192                         }
 193
 194                         /* get <who> */
 195                         split( argv[i], '=', &left, &right );
 196                         if ( strcmp( argv[i], "*" ) == 0 ) {
 197                                 b->a_dnpat = ch_strdup( ".*" );
 198                         } else if ( strcasecmp( argv[i], "self" ) == 0 ) {
 199                                 b->a_dnpat = ch_strdup( "self" );
 200                         } else if ( strcasecmp( left, "dn" ) == 0 ) {
 201                                 regtest(fname, lineno, right);
 202                                 /* ### Should be normalized, but how? */
 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 #ifdef SLAPD_ACLGROUPS
 208                         } else if ( strcasecmp( left, "group" ) == 0 ) {
 209                                 char *name = NULL;
 210                                 char *value = NULL;
 211                                 regtest(fname, lineno, right);
 212
 213                                 /* format of string is "group/objectClassValue/groupAttrName"
 214                                  */
 215                                 if ((value = strchr(right, '/')) != NULL) {
 216                                         *value++ = '\0';
 217                                         if (value && *value && (name = strchr(value, '/')) != NULL)
 218                                             *name++ = '\0';
 219                                 }
 220
 221                                 /* ### Should it be normalized? */
 222                                 b->a_group = dn_upcase(ch_strdup( right ));
 223
 224                                 if (value && *value) {
 225                                         b->a_objectclassvalue = ch_strdup(value);
 226                                         *--value = '/';
 227                                 }
 228                                 else
 229                                         b->a_objectclassvalue = ch_strdup("groupOfNames");
 230
 231                                 if (name && *name) {
 232                                         b->a_groupattrname = ch_strdup(name);
 233                                         *--name = '/';
 234                                 }
 235                                 else
 236                                         b->a_groupattrname = ch_strdup("member");
 237
 238
 239
 240 #endif /* SLAPD_ACLGROUPS */
 241                         } else if ( strcasecmp( left, "domain" ) == 0 ) {
 242                                 char    *s;
 243                                 regtest(fname, lineno, right);
 244                                 b->a_domainpat = ch_strdup( right );
 245
 246                                 /* normalize the domain */
 247                                 for ( s = b->a_domainpat; *s; s++ ) {
 248                                         *s = TOLOWER( (unsigned char) *s );
 249                                 }
 250                         } else if ( strcasecmp( left, "addr" ) == 0 ) {
 251                                 regtest(fname, lineno, right);
 252                                 b->a_addrpat = ch_strdup( right );
 253                         } else {
 254                                 fprintf( stderr,
 255                                     "%s: line %d: expecting <who> got \"%s\"\n",
 256                                     fname, lineno, left );
 257                                 acl_usage();
 258                         }
 259
 260                         if ( ++i == argc ) {
 261                                 fprintf( stderr,
 262                             "%s: line %d: premature eol: expecting <access>\n",
 263                                     fname, lineno );
 264                                 acl_usage();
 265                         }
 266
 267                         /* get <access> */
 268                         split( argv[i], '=', &left, &right );
 269                         if ( (b->a_access = str2access( left )) == -1 ) {
 270                                 fprintf( stderr,
 271                             "%s: line %d: expecting <access> got \"%s\"\n",
 272                                     fname, lineno, left );
 273                                 acl_usage();
 274                         }
 275                         access_append( &a->acl_access, b );
 276
 277                 } else {
 278                         fprintf( stderr,
 279                     "%s: line %d: expecting \"to\" or \"by\" got \"%s\"\n",
 280                             fname, lineno, argv[i] );
 281                         acl_usage();
 282                 }
 283         }
 284
 285         /* if we have no real access clause, complain and do nothing */
 286         if ( a == NULL ) {
 287                         fprintf( stderr,
 288                                 "%s: line %d: warning: no access clause(s) specified in access line\n",
 289                             fname, lineno );
 290
 291         } else {
 292
 293 #ifdef LDAP_DEBUG
 294                 if (ldap_debug & LDAP_DEBUG_ACL)
 295                     print_acl(a);
 296 #endif
 297
 298                 if ( a->acl_access == NULL ) {
 299                         fprintf( stderr,
 300                         "%s: line %d: warning: no by clause(s) specified in access line\n",
 301                             fname, lineno );
 302                 }
 303
 304                 if ( be != NULL ) {
 305                         acl_append( &be->be_acl, a );
 306                 } else {
 307                         acl_append( &global_acl, a );
 308                 }
 309         }
 310 }
 311
 312 char *
 313 access2str( int access )
 314 {
 315         static char     buf[12];
 316
 317         if ( access & ACL_SELF ) {
 318                 strcpy( buf, "self" );
 319         } else {
 320                 buf[0] = '\0';
 321         }
 322
 323         if ( access & ACL_NONE ) {
 324                 strcat( buf, "none" );
 325         } else if ( access & ACL_COMPARE ) {
 326                 strcat( buf, "compare" );
 327         } else if ( access & ACL_SEARCH ) {
 328                 strcat( buf, "search" );
 329         } else if ( access & ACL_READ ) {
 330                 strcat( buf, "read" );
 331         } else if ( access & ACL_WRITE ) {
 332                 strcat( buf, "write" );
 333         } else {
 334                 strcat( buf, "unknown" );
 335         }
 336
 337         return( buf );
 338 }
 339
 340 int
 341 str2access( char *str )
 342 {
 343         int     access;
 344
 345         access = 0;
 346         if ( strncasecmp( str, "self", 4 ) == 0 ) {
 347                 access |= ACL_SELF;
 348                 str += 4;
 349         }
 350
 351         if ( strcasecmp( str, "none" ) == 0 ) {
 352                 access |= ACL_NONE;
 353         } else if ( strcasecmp( str, "compare" ) == 0 ) {
 354                 access |= ACL_COMPARE;
 355         } else if ( strcasecmp( str, "search" ) == 0 ) {
 356                 access |= ACL_SEARCH;
 357         } else if ( strcasecmp( str, "read" ) == 0 ) {
 358                 access |= ACL_READ;
 359         } else if ( strcasecmp( str, "write" ) == 0 ) {
 360                 access |= ACL_WRITE;
 361         } else {
 362                 access = -1;
 363         }
 364
 365         return( access );
 366 }
 367
 368 static void
 369 acl_usage( void )
 370 {
 371         fprintf( stderr, "\n<access clause> ::= access to <what> [ by <who> <access> ]+ \n" );
 372         fprintf( stderr, "<what> ::= * | [dn=<regex>] [filter=<ldapfilter>] [attrs=<attrlist>]\n" );
 373         fprintf( stderr, "<attrlist> ::= <attr> | <attr> , <attrlist>\n" );
 374         fprintf( stderr, "<attr> ::= <attrname> | entry | children\n" );
 375         fprintf( stderr, "<who> ::= * | self | dn=<regex> | addr=<regex> |\n\tdomain=<regex> | dnattr=<dnattrname>\n" );
 376         fprintf( stderr, "<access> ::= [self]{none | compare | search | read | write }\n" );
 377         exit( 1 );
 378 }
 379
 380 static void
 381 split(
 382     char        *line,
 383     int         splitchar,
 384     char        **left,
 385     char        **right
 386 )
 387 {
 388         *left = line;
 389         if ( (*right = strchr( line, splitchar )) != NULL ) {
 390                 *((*right)++) = '\0';
 391         }
 392 }
 393
 394 static void
 395 access_append( struct access **l, struct access *a )
 396 {
 397         for ( ; *l != NULL; l = &(*l)->a_next )
 398                 ;       /* NULL */
 399
 400         *l = a;
 401 }
 402
 403 static void
 404 acl_append( struct acl **l, struct acl *a )
 405 {
 406         for ( ; *l != NULL; l = &(*l)->acl_next )
 407                 ;       /* NULL */
 408
 409         *l = a;
 410 }
 411
 412 #ifdef LDAP_DEBUG
 413
 414 static void
 415 print_access( struct access *b )
 416 {
 417         fprintf( stderr, "\tby" );
 418
 419         if ( b->a_dnpat != NULL ) {
 420                 fprintf( stderr, " dn=%s", b->a_dnpat );
 421         } else if ( b->a_addrpat != NULL ) {
 422                 fprintf( stderr, " addr=%s", b->a_addrpat );
 423         } else if ( b->a_domainpat != NULL ) {
 424                 fprintf( stderr, " domain=%s", b->a_domainpat );
 425         } else if ( b->a_dnattr != NULL ) {
 426                 fprintf( stderr, " dnattr=%s", b->a_dnattr );
 427         }
 428 #ifdef SLAPD_ACLGROUPS
 429         else if ( b->a_group != NULL ) {
 430                 fprintf( stderr, " group: %s", b->a_group );
 431                 if ( b->a_objectclassvalue )
 432                         fprintf( stderr, " objectClassValue: %s", b->a_objectclassvalue );
 433                 if ( b->a_groupattrname )
 434                         fprintf( stderr, " groupAttrName: %s", b->a_groupattrname );
 435         }
 436 #endif
 437         fprintf( stderr, "\n" );
 438 }
 439
 440 static void
 441 print_acl( struct acl *a )
 442 {
 443         int             i;
 444         struct access   *b;
 445
 446         if ( a == NULL ) {
 447                 fprintf( stderr, "NULL\n" );
 448         }
 449         fprintf( stderr, "ACL: access to" );
 450         if ( a->acl_filter != NULL ) {
 451                 fprintf(  stderr," filter=" );
 452                 filter_print( a->acl_filter );
 453         }
 454         if ( a->acl_dnpat != NULL ) {
 455                 fprintf( stderr, " dn=" );
 456                 fprintf( stderr, a->acl_dnpat );
 457         }
 458         if ( a->acl_attrs != NULL ) {
 459                 int     first = 1;
 460
 461                 fprintf( stderr, "\n attrs=" );
 462                 for ( i = 0; a->acl_attrs[i] != NULL; i++ ) {
 463                         if ( ! first ) {
 464                                 fprintf( stderr, "," );
 465                         }
 466                         fprintf( stderr, a->acl_attrs[i] );
 467                         first = 0;
 468                 }
 469         }
 470         fprintf( stderr, "\n" );
 471         for ( b = a->acl_access; b != NULL; b = b->a_next ) {
 472                 print_access( b );
 473         }
 474         fprintf( stderr, "\n" );
 475 }
 476
 477 #endif /* LDAP_DEBUG */