git.sur5r.net Git - openldap/blob - servers/slapd/aclparse.c

   1 /* acl.c - routines to parse and check acl's */
   2
   3
   4 #include <stdio.h>
   5 #include <string.h>
   6 #include <sys/types.h>
   7 #include <sys/socket.h>
   8 #include <netinet/in.h>
   9 #include <netdb.h>
  10 #include <unistd.h>
  11 #include <regex.h>
  12
  13 #include "slap.h"
  14 #include "portable.h"
  15
  16 extern Filter           *str2filter();
  17 extern struct acl       *global_acl;
  18 extern char             **str2charray();
  19 extern char             *dn_upcase();
  20
  21 static void             split();
  22 static void             acl_append();
  23 static void             access_append();
  24 static void             acl_usage();
  25 #ifdef LDAP_DEBUG
  26 static void             print_acl();
  27 static void             print_access();
  28 #endif
  29
  30 int
  31 regtest(char *fname, int lineno, char *pat) {
  32         int e;
  33         regex_t re;
  34
  35         char buf[512];
  36         int size;
  37
  38         char *sp;
  39         char *dp;
  40         int  flag;
  41
  42         sp = pat;
  43         dp = buf;
  44         size = 0;
  45         buf[0] = '\0';
  46
  47         for (size = 0, flag = 0; (size < sizeof(buf)) && *sp; sp++) {
  48                 if (flag) {
  49                         if (*sp == '$'|| (*sp >= '0' && *sp <= '9')) {
  50                                 *dp++ = *sp;
  51                                 size++;
  52                         }
  53                         flag = 0;
  54
  55                 } else {
  56                         if (*sp == '$') {
  57                                 flag = 1;
  58                         } else {
  59                                 *dp++ = *sp;
  60                                 size++;
  61                         }
  62                 }
  63         }
  64
  65         *dp = '\0';
  66         if ( size >= (sizeof(buf)-1) ) {
  67                 fprintf( stderr,
  68                         "%s: line %d: regular expression \"%s\" too large\n",
  69                         fname, lineno, pat, 0 );
  70                 acl_usage();
  71         }
  72
  73         if ((e = regcomp(&re, buf, REG_EXTENDED|REG_ICASE))) {
  74                 char error[512];
  75                 regerror(e, &re, error, sizeof(error));
  76                 fprintf( stderr,
  77                         "%s: line %d: regular expression \"%s\" bad because of %s\n",
  78                         fname, lineno, pat, error );
  79                 acl_usage();
  80                 return(0);
  81         }
  82         regfree(&re);
  83         return(1);
  84 }
  85
  86 void
  87 parse_acl(
  88     Backend     *be,
  89     char        *fname,
  90     int         lineno,
  91     int         argc,
  92     char        **argv
  93 )
  94 {
  95         int             i;
  96         char            *e, *left, *right;
  97         struct acl      *a;
  98         struct access   *b;
  99
 100         a = NULL;
 101         for ( i = 1; i < argc; i++ ) {
 102                 /* to clause - select which entries are protected */
 103                 if ( strcasecmp( argv[i], "to" ) == 0 ) {
 104                         if ( a != NULL ) {
 105                                 fprintf( stderr,
 106                 "%s: line %d: only one to clause allowed in access line\n",
 107                                     fname, lineno );
 108                                 acl_usage();
 109                         }
 110                         a = (struct acl *) ch_calloc( 1, sizeof(struct acl) );
 111                         for ( ++i; i < argc; i++ ) {
 112                                 if ( strcasecmp( argv[i], "by" ) == 0 ) {
 113                                         i--;
 114                                         break;
 115                                 }
 116
 117                                 if ( strcasecmp( argv[i], "*" ) == 0 ) {
 118                                         int e;
 119                                         if ((e = regcomp( &a->acl_dnre, ".*",
 120                                                 REG_EXTENDED|REG_ICASE)))
 121                                         {
 122                                                 char buf[512];
 123                                                 regerror(e, &a->acl_dnre, buf, sizeof(buf));
 124                                                 fprintf( stderr,
 125                                                         "%s: line %d: regular expression \"%s\" bad because of %s\n",
 126                                                         fname, lineno, right, buf );
 127                                                 acl_usage();
 128                                         }
 129                                         a->acl_dnpat = strdup( ".*" );
 130                                         continue;
 131                                 }
 132
 133                                 split( argv[i], '=', &left, &right );
 134                                 if ( right == NULL || *right == '\0' ) {
 135                                         fprintf( stderr,
 136         "%s: line %d: missing \"=\" in (or value after) \"%s\" in to clause\n",
 137                                             fname, lineno, left );
 138                                         acl_usage();
 139                                 }
 140
 141                                 if ( strcasecmp( left, "filter" ) == 0 ) {
 142                                         if ( (a->acl_filter = str2filter(
 143                                             right )) == NULL ) {
 144                                                 fprintf( stderr,
 145                                 "%s: line %d: bad filter \"%s\" in to clause\n",
 146                                                     fname, lineno, right );
 147                                                 acl_usage();
 148                                         }
 149                                 } else if ( strcasecmp( left, "dn" ) == 0 ) {
 150                                         int e;
 151                                         if ((e = regcomp(&a->acl_dnre, right,
 152                                                 REG_EXTENDED|REG_ICASE))) {
 153                                                 char buf[512];
 154                                                 regerror(e, &a->acl_dnre, buf, sizeof(buf));
 155                                                 fprintf( stderr,
 156                                 "%s: line %d: regular expression \"%s\" bad because of %s\n",
 157                                                         fname, lineno, right, buf );
 158                                                 acl_usage();
 159
 160                                         } else {
 161                                                 a->acl_dnpat = dn_upcase(strdup( right ));
 162                                         }
 163                                 } else if ( strncasecmp( left, "attr", 4 )
 164                                     == 0 ) {
 165                                         char    **alist;
 166
 167                                         alist = str2charray( right, "," );
 168                                         charray_merge( &a->acl_attrs, alist );
 169                                         free( alist );
 170                                 } else {
 171                                         fprintf( stderr,
 172                                                 "%s: line %d: expecting <what> got \"%s\"\n",
 173                                             fname, lineno, left );
 174                                         acl_usage();
 175                                 }
 176                         }
 177
 178                 /* by clause - select who has what access to entries */
 179                 } else if ( strcasecmp( argv[i], "by" ) == 0 ) {
 180                         if ( a == NULL ) {
 181                                 fprintf( stderr,
 182                                         "%s: line %d: to clause required before by clause in access line\n",
 183                                     fname, lineno );
 184                                 acl_usage();
 185                         }
 186                         /*
 187                          * by clause consists of <who> and <access>
 188                          */
 189
 190                         b = (struct access *) ch_calloc( 1,
 191                             sizeof(struct access) );
 192
 193                         if ( ++i == argc ) {
 194                                 fprintf( stderr,
 195                             "%s: line %d: premature eol: expecting <who>\n",
 196                                     fname, lineno );
 197                                 acl_usage();
 198                         }
 199
 200                         /* get <who> */
 201                         split( argv[i], '=', &left, &right );
 202                         if ( strcasecmp( argv[i], "*" ) == 0 ) {
 203                                 b->a_dnpat = strdup( ".*" );
 204                         } else if ( strcasecmp( argv[i], "self" ) == 0 ) {
 205                                 b->a_dnpat = strdup( "self" );
 206                         } else if ( strcasecmp( left, "dn" ) == 0 ) {
 207                                 regtest(fname, lineno, right);
 208                                 b->a_dnpat = dn_upcase( strdup( right ) );
 209                         } else if ( strcasecmp( left, "dnattr" ) == 0 ) {
 210                                 b->a_dnattr = strdup( right );
 211
 212 #ifdef ACLGROUP
 213                         } else if ( strcasecmp( left, "group" ) == 0 ) {
 214                                 regtest(fname, lineno, right);
 215                                 b->a_group = dn_upcase(strdup( right ));
 216 #endif /* ACLGROUP */
 217                         } else if ( strcasecmp( left, "domain" ) == 0 ) {
 218                                 char    *s;
 219                                 regtest(fname, lineno, right);
 220                                 b->a_domainpat = strdup( right );
 221
 222                                 /* normalize the domain */
 223                                 for ( s = b->a_domainpat; *s; s++ ) {
 224                                         *s = TOLOWER( *s );
 225                                 }
 226                         } else if ( strcasecmp( left, "addr" ) == 0 ) {
 227                                 regtest(fname, lineno, right);
 228                                 b->a_addrpat = strdup( right );
 229                         } else {
 230                                 fprintf( stderr,
 231                                     "%s: line %d: expecting <who> got \"%s\"\n",
 232                                     fname, lineno, left );
 233                                 acl_usage();
 234                         }
 235
 236                         if ( ++i == argc ) {
 237                                 fprintf( stderr,
 238                             "%s: line %d: premature eol: expecting <access>\n",
 239                                     fname, lineno );
 240                                 acl_usage();
 241                         }
 242
 243                         /* get <access> */
 244                         split( argv[i], '=', &left, &right );
 245                         if ( (b->a_access = str2access( left )) == -1 ) {
 246                                 fprintf( stderr,
 247                             "%s: line %d: expecting <access> got \"%s\"\n",
 248                                     fname, lineno, left );
 249                                 acl_usage();
 250                         }
 251                         access_append( &a->acl_access, b );
 252
 253                 } else {
 254                         fprintf( stderr,
 255                     "%s: line %d: expecting \"to\" or \"by\" got \"%s\"\n",
 256                             fname, lineno, argv[i] );
 257                         acl_usage();
 258                 }
 259         }
 260
 261         /* if we have no real access clause, complain and do nothing */
 262         if ( a == NULL ) {
 263                         fprintf( stderr,
 264                                 "%s: line %d: warning: no access clause(s) specified in access line\n",
 265                             fname, lineno );
 266
 267         } else {
 268
 269                 if ( a->acl_access == NULL ) {
 270                         fprintf( stderr,
 271                         "%s: line %d: warning: no by clause(s) specified in access line\n",
 272                             fname, lineno );
 273                 }
 274
 275                 if ( be != NULL ) {
 276                         acl_append( &be->be_acl, a );
 277                 } else {
 278                         acl_append( &global_acl, a );
 279                 }
 280         }
 281 }
 282
 283 char *
 284 access2str( int access )
 285 {
 286         static char     buf[12];
 287
 288         if ( access & ACL_SELF ) {
 289                 strcpy( buf, "self" );
 290         } else {
 291                 buf[0] = '\0';
 292         }
 293
 294         if ( access & ACL_NONE ) {
 295                 strcat( buf, "none" );
 296         } else if ( access & ACL_COMPARE ) {
 297                 strcat( buf, "compare" );
 298         } else if ( access & ACL_SEARCH ) {
 299                 strcat( buf, "search" );
 300         } else if ( access & ACL_READ ) {
 301                 strcat( buf, "read" );
 302         } else if ( access & ACL_WRITE ) {
 303                 strcat( buf, "write" );
 304         } else {
 305                 strcat( buf, "unknown" );
 306         }
 307
 308         return( buf );
 309 }
 310
 311 int
 312 str2access( char *str )
 313 {
 314         int     access;
 315
 316         access = 0;
 317         if ( strncasecmp( str, "self", 4 ) == 0 ) {
 318                 access |= ACL_SELF;
 319                 str += 4;
 320         }
 321
 322         if ( strcasecmp( str, "none" ) == 0 ) {
 323                 access |= ACL_NONE;
 324         } else if ( strcasecmp( str, "compare" ) == 0 ) {
 325                 access |= ACL_COMPARE;
 326         } else if ( strcasecmp( str, "search" ) == 0 ) {
 327                 access |= ACL_SEARCH;
 328         } else if ( strcasecmp( str, "read" ) == 0 ) {
 329                 access |= ACL_READ;
 330         } else if ( strcasecmp( str, "write" ) == 0 ) {
 331                 access |= ACL_WRITE;
 332         } else {
 333                 access = -1;
 334         }
 335
 336         return( access );
 337 }
 338
 339 static void
 340 acl_usage()
 341 {
 342         fprintf( stderr, "\n<access clause> ::= access to <what> [ by <who> <access> ]+ \n" );
 343         fprintf( stderr, "<what> ::= * | [dn=<regex>] [filter=<ldapfilter>] [attrs=<attrlist>]\n" );
 344         fprintf( stderr, "<attrlist> ::= <attr> | <attr> , <attrlist>\n" );
 345         fprintf( stderr, "<attr> ::= <attrname> | entry | children\n" );
 346         fprintf( stderr, "<who> ::= * | self | dn=<regex> | addr=<regex> |\n\tdomain=<regex> | dnattr=<dnattrname>\n" );
 347         fprintf( stderr, "<access> ::= [self]{none | compare | search | read | write }\n" );
 348         exit( 1 );
 349 }
 350
 351 static void
 352 split(
 353     char        *line,
 354     int         splitchar,
 355     char        **left,
 356     char        **right
 357 )
 358 {
 359         *left = line;
 360         if ( (*right = strchr( line, splitchar )) != NULL ) {
 361                 *((*right)++) = '\0';
 362         }
 363 }
 364
 365 static void
 366 access_append( struct access **l, struct access *a )
 367 {
 368         for ( ; *l != NULL; l = &(*l)->a_next )
 369                 ;       /* NULL */
 370
 371         *l = a;
 372 }
 373
 374 static void
 375 acl_append( struct acl **l, struct acl *a )
 376 {
 377         for ( ; *l != NULL; l = &(*l)->acl_next )
 378                 ;       /* NULL */
 379
 380         *l = a;
 381 }
 382
 383 #ifdef LDAP_DEBUG
 384
 385 static void
 386 print_access( struct access *b )
 387 {
 388         printf( "\tby" );
 389         if ( b->a_dnpat != NULL ) {
 390                 printf( " dn=%s", b->a_dnpat );
 391         } else if ( b->a_addrpat != NULL ) {
 392                 printf( " addr=%s", b->a_addrpat );
 393         } else if ( b->a_domainpat != NULL ) {
 394                 printf( " domain=%s", b->a_domainpat );
 395         } else if ( b->a_dnattr != NULL ) {
 396                 printf( " dnattr=%s", b->a_dnattr );
 397         }
 398         printf( " %s\n", access2str( b->a_access ) );
 399 }
 400
 401 static void
 402 print_acl( struct acl *a )
 403 {
 404         int             i;
 405         struct access   *b;
 406
 407         if ( a == NULL ) {
 408                 printf( "NULL\n" );
 409         }
 410         printf( "access to" );
 411         if ( a->acl_filter != NULL ) {
 412                 printf( " filter=" );
 413                 filter_print( a->acl_filter );
 414         }
 415         if ( a->acl_dnpat != NULL ) {
 416                 printf( " dn=" );
 417                 printf( a->acl_dnpat );
 418         }
 419         if ( a->acl_attrs != NULL ) {
 420                 int     first = 1;
 421
 422                 printf( " attrs=" );
 423                 for ( i = 0; a->acl_attrs[i] != NULL; i++ ) {
 424                         if ( ! first ) {
 425                                 printf( "," );
 426                         }
 427                         printf( a->acl_attrs[i] );
 428                         first = 0;
 429                 }
 430         }
 431         printf( "\n" );
 432         for ( b = a->acl_access; b != NULL; b = b->a_next ) {
 433                 print_access( b );
 434         }
 435 }
 436
 437 #endif /* LDAP_DEBUG */