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