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], "self" ) == 0 ) {
 198                                 b->a_dnpat = ch_strdup( "self" );
 199                         } else if ( strcasecmp( left, "dn" ) == 0 ) {
 200                                 regtest(fname, lineno, right);
 201                                 b->a_dnpat = dn_upcase( ch_strdup( right ) );
 202                         } else if ( strcasecmp( left, "dnattr" ) == 0 ) {
 203                                 b->a_dnattr = ch_strdup( right );
 204
 205 #ifdef SLAPD_ACLGROUPS
 206                         } else if ( strncasecmp( left, "group", sizeof("group")-1 ) == 0 ) {
 207                                 char *name = NULL;
 208                                 char *value = NULL;
 209                                 regtest(fname, lineno, right);
 210
 211                                 /* format of string is "group/objectClassValue/groupAttrName"
 212                                  */
 213                                 if ((value = strchr(left, '/')) != NULL) {
 214                                         *value++ = '\0';
 215                                         if (value && *value && (name = strchr(value, '/')) != NULL)
 216                                             *name++ = '\0';
 217                                 }
 218
 219                                 b->a_group = dn_upcase(ch_strdup( right ));
 220
 221                                 if (value && *value) {
 222                                         b->a_objectclassvalue = ch_strdup(value);
 223                                         *--value = '/';
 224                                 }
 225                                 else
 226                                         b->a_objectclassvalue = ch_strdup("groupOfNames");
 227
 228                                 if (name && *name) {
 229                                         b->a_groupattrname = ch_strdup(name);
 230                                         *--name = '/';
 231                                 }
 232                                 else
 233                                         b->a_groupattrname = ch_strdup("member");
 234
 235
 236
 237 #endif /* SLAPD_ACLGROUPS */
 238                         } else if ( strcasecmp( left, "domain" ) == 0 ) {
 239                                 char    *s;
 240                                 regtest(fname, lineno, right);
 241                                 b->a_domainpat = ch_strdup( right );
 242
 243                                 /* normalize the domain */
 244                                 for ( s = b->a_domainpat; *s; s++ ) {
 245                                         *s = TOLOWER( (unsigned char) *s );
 246                                 }
 247                         } else if ( strcasecmp( left, "addr" ) == 0 ) {
 248                                 regtest(fname, lineno, right);
 249                                 b->a_addrpat = ch_strdup( right );
 250                         } else {
 251                                 fprintf( stderr,
 252                                     "%s: line %d: expecting <who> got \"%s\"\n",
 253                                     fname, lineno, left );
 254                                 acl_usage();
 255                         }
 256
 257                         if ( ++i == argc ) {
 258                                 fprintf( stderr,
 259                             "%s: line %d: premature eol: expecting <access>\n",
 260                                     fname, lineno );
 261                                 acl_usage();
 262                         }
 263
 264                         /* get <access> */
 265                         split( argv[i], '=', &left, &right );
 266                         if ( (b->a_access = str2access( left )) == -1 ) {
 267                                 fprintf( stderr,
 268                             "%s: line %d: expecting <access> got \"%s\"\n",
 269                                     fname, lineno, left );
 270                                 acl_usage();
 271                         }
 272                         access_append( &a->acl_access, b );
 273
 274                 } else {
 275                         fprintf( stderr,
 276                     "%s: line %d: expecting \"to\" or \"by\" got \"%s\"\n",
 277                             fname, lineno, argv[i] );
 278                         acl_usage();
 279                 }
 280         }
 281
 282         /* if we have no real access clause, complain and do nothing */
 283         if ( a == NULL ) {
 284                         fprintf( stderr,
 285                                 "%s: line %d: warning: no access clause(s) specified in access line\n",
 286                             fname, lineno );
 287
 288         } else {
 289
 290 #ifdef LDAP_DEBUG
 291                 if (ldap_debug & LDAP_DEBUG_ACL)
 292                     print_acl(a);
 293 #endif
 294
 295                 if ( a->acl_access == NULL ) {
 296                         fprintf( stderr,
 297                         "%s: line %d: warning: no by clause(s) specified in access line\n",
 298                             fname, lineno );
 299                 }
 300
 301                 if ( be != NULL ) {
 302                         acl_append( &be->be_acl, a );
 303                 } else {
 304                         acl_append( &global_acl, a );
 305                 }
 306         }
 307 }
 308
 309 char *
 310 access2str( int access )
 311 {
 312         static char     buf[12];
 313
 314         if ( access & ACL_SELF ) {
 315                 strcpy( buf, "self" );
 316         } else {
 317                 buf[0] = '\0';
 318         }
 319
 320         if ( access & ACL_NONE ) {
 321                 strcat( buf, "none" );
 322         } else if ( access & ACL_COMPARE ) {
 323                 strcat( buf, "compare" );
 324         } else if ( access & ACL_SEARCH ) {
 325                 strcat( buf, "search" );
 326         } else if ( access & ACL_READ ) {
 327                 strcat( buf, "read" );
 328         } else if ( access & ACL_WRITE ) {
 329                 strcat( buf, "write" );
 330         } else {
 331                 strcat( buf, "unknown" );
 332         }
 333
 334         return( buf );
 335 }
 336
 337 int
 338 str2access( char *str )
 339 {
 340         int     access;
 341
 342         access = 0;
 343         if ( strncasecmp( str, "self", 4 ) == 0 ) {
 344                 access |= ACL_SELF;
 345                 str += 4;
 346         }
 347
 348         if ( strcasecmp( str, "none" ) == 0 ) {
 349                 access |= ACL_NONE;
 350         } else if ( strcasecmp( str, "compare" ) == 0 ) {
 351                 access |= ACL_COMPARE;
 352         } else if ( strcasecmp( str, "search" ) == 0 ) {
 353                 access |= ACL_SEARCH;
 354         } else if ( strcasecmp( str, "read" ) == 0 ) {
 355                 access |= ACL_READ;
 356         } else if ( strcasecmp( str, "write" ) == 0 ) {
 357                 access |= ACL_WRITE;
 358         } else {
 359                 access = -1;
 360         }
 361
 362         return( access );
 363 }
 364
 365 static void
 366 acl_usage( void )
 367 {
 368         fprintf( stderr, "\n<access clause> ::= access to <what> [ by <who> <access> ]+ \n" );
 369         fprintf( stderr, "<what> ::= * | [dn=<regex>] [filter=<ldapfilter>] [attrs=<attrlist>]\n" );
 370         fprintf( stderr, "<attrlist> ::= <attr> | <attr> , <attrlist>\n" );
 371         fprintf( stderr, "<attr> ::= <attrname> | entry | children\n" );
 372         fprintf( stderr, "<who> ::= * | self | dn=<regex> | addr=<regex> |\n\tdomain=<regex> | dnattr=<dnattrname>\n" );
 373         fprintf( stderr, "<access> ::= [self]{none | compare | search | read | write }\n" );
 374         exit( 1 );
 375 }
 376
 377 static void
 378 split(
 379     char        *line,
 380     int         splitchar,
 381     char        **left,
 382     char        **right
 383 )
 384 {
 385         *left = line;
 386         if ( (*right = strchr( line, splitchar )) != NULL ) {
 387                 *((*right)++) = '\0';
 388         }
 389 }
 390
 391 static void
 392 access_append( struct access **l, struct access *a )
 393 {
 394         for ( ; *l != NULL; l = &(*l)->a_next )
 395                 ;       /* NULL */
 396
 397         *l = a;
 398 }
 399
 400 static void
 401 acl_append( struct acl **l, struct acl *a )
 402 {
 403         for ( ; *l != NULL; l = &(*l)->acl_next )
 404                 ;       /* NULL */
 405
 406         *l = a;
 407 }
 408
 409 #ifdef LDAP_DEBUG
 410
 411 static void
 412 print_access( struct access *b )
 413 {
 414         fprintf( stderr, "\tby" );
 415
 416         if ( b->a_dnpat != NULL ) {
 417                 fprintf( stderr, " dn=%s", b->a_dnpat );
 418         } else if ( b->a_addrpat != NULL ) {
 419                 fprintf( stderr, " addr=%s", b->a_addrpat );
 420         } else if ( b->a_domainpat != NULL ) {
 421                 fprintf( stderr, " domain=%s", b->a_domainpat );
 422         } else if ( b->a_dnattr != NULL ) {
 423                 fprintf( stderr, " dnattr=%s", b->a_dnattr );
 424         }
 425 #ifdef SLAPD_ACLGROUPS
 426         else if ( b->a_group != NULL ) {
 427                 fprintf( stderr, " group: %s", b->a_group );
 428                 if ( b->a_objectclassvalue )
 429                         fprintf( stderr, " objectClassValue: %s", b->a_objectclassvalue );
 430                 if ( b->a_groupattrname )
 431                         fprintf( stderr, " groupAttrName: %s", b->a_groupattrname );
 432         }
 433 #endif
 434         fprintf( stderr, "\n" );
 435 }
 436
 437 static void
 438 print_acl( struct acl *a )
 439 {
 440         int             i;
 441         struct access   *b;
 442
 443         if ( a == NULL ) {
 444                 fprintf( stderr, "NULL\n" );
 445         }
 446         fprintf( stderr, "ACL: access to" );
 447         if ( a->acl_filter != NULL ) {
 448                 fprintf(  stderr," filter=" );
 449                 filter_print( a->acl_filter );
 450         }
 451         if ( a->acl_dnpat != NULL ) {
 452                 fprintf( stderr, " dn=" );
 453                 fprintf( stderr, a->acl_dnpat );
 454         }
 455         if ( a->acl_attrs != NULL ) {
 456                 int     first = 1;
 457
 458                 fprintf( stderr, "\n attrs=" );
 459                 for ( i = 0; a->acl_attrs[i] != NULL; i++ ) {
 460                         if ( ! first ) {
 461                                 fprintf( stderr, "," );
 462                         }
 463                         fprintf( stderr, a->acl_attrs[i] );
 464                         first = 0;
 465                 }
 466         }
 467         fprintf( stderr, "\n" );
 468         for ( b = a->acl_access; b != NULL; b = b->a_next ) {
 469                 print_access( b );
 470         }
 471         fprintf( stderr, "\n" );
 472 }
 473
 474 #endif /* LDAP_DEBUG */