1 /* acl.c - routines to parse and check acl's */
13 static int regex_matches(char *pat, char *str, char *buf, regmatch_t *matches);
14 static void string_expand(char *newbuf, int bufsiz, char *pattern,
15 char *match, regmatch_t *matches);
19 * access_allowed - check whether op->o_ndn is allowed the requested access
20 * to entry e, attribute attr, value val. if val is null, access to
21 * the whole attribute is assumed (all values). this routine finds
22 * the applicable acl and calls acl_access_allowed() to make the
25 * returns 0 access NOT allowed
44 regmatch_t matches[MAXREMATCHES];
54 Debug( LDAP_DEBUG_ACL, "\n=> access_allowed: entry (%s) attr (%s)\n",
57 /* the lastmod attributes are ignored by ACL checking */
58 if ( oc_check_operational( attr ) ) {
59 Debug( LDAP_DEBUG_ACL, "Operational attribute: %s access allowed\n",
64 memset(matches, 0, sizeof(matches));
66 a = acl_get_applicable( be, op, e, attr, MAXREMATCHES, matches );
69 for (i = 0; i < MAXREMATCHES && matches[i].rm_so > 0; i++) {
70 Debug( LDAP_DEBUG_ARGS, "=> match[%d]: %d %d ", i,
71 (int)matches[i].rm_so, (int)matches[i].rm_eo );
73 if( matches[i].rm_so <= matches[0].rm_eo ) {
74 for ( n = matches[i].rm_so; n < matches[i].rm_eo; n++) {
75 Debug( LDAP_DEBUG_ARGS, "%c", edn[n], 0, 0 );
78 Debug( LDAP_DEBUG_ARGS, "\n", 0, 0, 0 );
82 rc = acl_access_allowed( a, be, conn, e, val, op, access, edn, matches );
84 Debug( LDAP_DEBUG_ACL, "\n=> access_allowed: exit (%s) attr (%s)\n",
91 * acl_get_applicable - return the acl applicable to entry e, attribute
92 * attr. the acl returned is suitable for use in subsequent calls to
93 * acl_access_allowed().
110 Debug( LDAP_DEBUG_ACL, "\n=> acl_get: entry (%s) attr (%s)\n",
113 if ( be_isroot( be, op->o_ndn ) ) {
114 Debug( LDAP_DEBUG_ACL,
115 "<= acl_get: no acl applicable to database root\n", 0, 0,
122 Debug( LDAP_DEBUG_ARGS, "=> acl_get: edn %s\n", edn, 0, 0 );
124 /* check for a backend-specific acl that matches the entry */
125 for ( i = 1, a = be->be_acl; a != NULL; a = a->acl_next, i++ ) {
126 if (a->acl_dnpat != NULL) {
127 Debug( LDAP_DEBUG_TRACE, "=> dnpat: [%d] %s nsub: %d\n",
128 i, a->acl_dnpat, (int) a->acl_dnre.re_nsub);
130 if (regexec(&a->acl_dnre, edn, nmatch, matches, 0))
133 Debug( LDAP_DEBUG_TRACE, "=> acl_get:[%d] backend ACL match\n",
137 if ( a->acl_filter != NULL ) {
138 if ( test_filter( NULL, NULL, NULL, e, a->acl_filter ) != 0 ) {
143 Debug( LDAP_DEBUG_ARGS, "=> acl_get: [%d] check attr %s\n", i, attr, 0);
145 if ( attr == NULL || a->acl_attrs == NULL ||
146 charray_inlist( a->acl_attrs, attr ) )
148 Debug( LDAP_DEBUG_ACL, "<= acl_get: [%d] backend acl %s attr: %s\n",
152 matches[0].rm_so = matches[0].rm_eo = -1;
155 /* check for a global acl that matches the entry */
156 for ( i = 1, a = global_acl; a != NULL; a = a->acl_next, i++ ) {
157 if (a->acl_dnpat != NULL) {
158 Debug( LDAP_DEBUG_TRACE, "=> dnpat: [%d] %s nsub: %d\n",
159 i, a->acl_dnpat, (int) a->acl_dnre.re_nsub);
161 if (regexec(&a->acl_dnre, edn, nmatch, matches, 0)) {
164 Debug( LDAP_DEBUG_TRACE, "=> acl_get: [%d] global ACL match\n",
169 if ( a->acl_filter != NULL ) {
170 if ( test_filter( NULL, NULL, NULL, e, a->acl_filter ) != 0 ) {
175 Debug( LDAP_DEBUG_ARGS, "=> acl_get: [%d] check attr\n", i, 0, 0);
177 if ( attr == NULL || a->acl_attrs == NULL ||
178 charray_inlist( a->acl_attrs, attr ) )
180 Debug( LDAP_DEBUG_ACL, "<= acl_get: [%d] global acl %s attr: %s\n",
185 matches[0].rm_so = matches[0].rm_eo = -1;
188 Debug( LDAP_DEBUG_ACL, "<= acl_get: no match\n", 0, 0, 0 );
193 * acl_access_allowed - check whether the given acl allows dn the
194 * requested access to entry e, attribute attr, value val. if val
195 * is null, access to the whole attribute is assumed (all values).
197 * returns 0 access NOT allowed
221 Debug( LDAP_DEBUG_ACL,
222 "\n=> acl_access_allowed: %s access to entry \"%s\"\n",
223 access2str( access ), e->e_dn, 0 );
225 Debug( LDAP_DEBUG_ACL,
226 "\n=> acl_access_allowed: %s access to value \"%s\" by \"%s\"\n",
227 access2str( access ),
228 val ? val->bv_val : "any",
229 op->o_ndn ? op->o_ndn : "" );
231 if ( be_isroot( be, op->o_ndn ) ) {
232 Debug( LDAP_DEBUG_ACL,
233 "<= acl_access_allowed: granted to database root\n",
238 default_access = be->be_dfltaccess ? be->be_dfltaccess : global_default_access;
241 Debug( LDAP_DEBUG_ACL,
242 "<= acl_access_allowed: %s by default (no matching to)\n",
243 default_access >= access ? "granted" : "denied", 0, 0 );
244 return( default_access >= access );
251 bv.bv_len = strlen( odn );
254 for ( i = 1, b = a->acl_access; b != NULL; b = b->a_next, i++ ) {
255 if ( b->a_dnpat != NULL ) {
256 Debug( LDAP_DEBUG_TRACE, "<= check a_dnpat: %s\n",
259 * if access applies to the entry itself, and the
260 * user is bound as somebody in the same namespace as
261 * the entry, OR the given dn matches the dn pattern
263 if ( strcasecmp( b->a_dnpat, "anonymous" ) == 0 &&
264 (op->o_ndn == NULL || *(op->o_ndn) == '\0' ) )
266 Debug( LDAP_DEBUG_ACL,
267 "<= acl_access_allowed: matched by clause #%d access %s\n",
268 i, ACL_GRANT(b->a_access, access)
269 ? "granted" : "denied", 0 );
271 return ACL_GRANT(b->a_access, access );
273 } else if ( strcasecmp( b->a_dnpat, "self" ) == 0 &&
274 op->o_ndn != NULL && *(op->o_ndn) && e->e_dn != NULL )
276 if ( strcmp( edn, op->o_ndn ) == 0 ) {
277 Debug( LDAP_DEBUG_ACL,
278 "<= acl_access_allowed: matched by clause #%d access %s\n",
279 i, ACL_GRANT(b->a_access, access)
280 ? "granted" : "denied", 0 );
282 return ACL_GRANT(b->a_access, access );
285 if ( regex_matches( b->a_dnpat, odn, edn, matches ) ) {
286 Debug( LDAP_DEBUG_ACL,
287 "<= acl_access_allowed: matched by clause #%d access %s\n",
288 i, ACL_GRANT(b->a_access, access)
289 ? "granted" : "denied", 0 );
291 return ACL_GRANT(b->a_access, access );
295 if ( b->a_addrpat != NULL ) {
296 if ( regex_matches( b->a_addrpat, conn->c_client_addr,
299 Debug( LDAP_DEBUG_ACL,
300 "<= acl_access_allowed: matched by clause #%d access %s\n",
301 i, ACL_GRANT(b->a_access, access)
302 ? "granted" : "denied", 0 );
304 return ACL_GRANT(b->a_access, access );
307 if ( b->a_domainpat != NULL ) {
308 Debug( LDAP_DEBUG_ARGS, "<= check a_domainpath: %s\n",
309 b->a_domainpat, 0, 0 );
310 if ( regex_matches( b->a_domainpat, conn->c_client_name,
313 Debug( LDAP_DEBUG_ACL,
314 "<= acl_access_allowed: matched by clause #%d access %s\n",
315 i, ACL_GRANT(b->a_access, access)
316 ? "granted" : "denied", 0 );
318 return ACL_GRANT(b->a_access, access );
321 if ( b->a_dnattr != NULL && op->o_ndn != NULL ) {
322 Debug( LDAP_DEBUG_ARGS, "<= check a_dnattr: %s\n",
324 /* see if asker is listed in dnattr */
325 if ( (at = attr_find( e->e_attrs, b->a_dnattr )) != NULL &&
326 value_find( at->a_vals, &bv, at->a_syntax, 3 ) == 0 )
328 if ( ACL_IS_SELF(b->a_access) &&
329 (val == NULL || value_cmp( &bv, val, at->a_syntax, 2 )) )
334 Debug( LDAP_DEBUG_ACL,
335 "<= acl_acces_allowed: matched by clause #%d access %s\n",
336 i, ACL_GRANT(b->a_access, access)
337 ? "granted" : "denied", 0 );
339 return ACL_GRANT(b->a_access, access );
342 /* asker not listed in dnattr - check for self access */
343 if ( ! ACL_IS_SELF(b->a_access) || val == NULL ||
344 value_cmp( &bv, val, at->a_syntax, 2 ) != 0 )
349 Debug( LDAP_DEBUG_ACL,
350 "<= acl_access_allowed: matched by clause #%d (self) access %s\n",
351 i, ACL_GRANT(b->a_access, access)
352 ? "granted" : "denied", 0 );
354 return ACL_GRANT(b->a_access, access );
357 if ( b->a_group != NULL && op->o_ndn != NULL ) {
360 /* b->a_group is an unexpanded entry name, expanded it should be an
361 * entry with objectclass group* and we test to see if odn is one of
362 * the values in the attribute group
364 /* see if asker is listed in dnattr */
365 string_expand(buf, sizeof(buf), b->a_group, edn, matches);
366 (void) dn_normalize_case(buf);
368 if (backend_group(be, e, buf, odn,
369 b->a_group_oc, b->a_group_at) == 0)
371 Debug( LDAP_DEBUG_ACL,
372 "<= acl_access_allowed: matched by clause #%d (group) access granted\n",
374 return ACL_GRANT(b->a_access, access );
379 Debug( LDAP_DEBUG_ACL,
380 "<= acl_access_allowed: %s by default (no matching by)\n",
381 default_access >= access ? "granted" : "denied", 0, 0 );
383 return( default_access >= access );
387 * acl_check_modlist - check access control on the given entry to see if
388 * it allows the given modifications by the user associated with op.
389 * returns LDAP_SUCCESS mods allowed ok
390 * anything else mods not allowed - return is an error
391 * code indicating the problem
405 char *edn = e->e_ndn;
407 for ( ; mlist != NULL; mlist = mlist->ml_next ) {
408 regmatch_t matches[MAXREMATCHES];
410 /* the lastmod attributes are ignored by ACL checking */
411 if ( oc_check_operational( mlist->ml_type ) ) {
412 Debug( LDAP_DEBUG_ACL, "Operational attribute: %s access allowed\n",
413 mlist->ml_type, 0, 0 );
417 a = acl_get_applicable( be, op, e, mlist->ml_type,
418 MAXREMATCHES, matches );
420 switch ( mlist->ml_op & ~LDAP_MOD_BVALUES ) {
421 case LDAP_MOD_REPLACE:
423 if ( mlist->ml_bvalues == NULL ) {
426 for ( i = 0; mlist->ml_bvalues[i] != NULL; i++ ) {
427 if ( ! acl_access_allowed( a, be, conn, e, mlist->ml_bvalues[i],
428 op, ACL_WRITE, edn, matches) )
430 return( LDAP_INSUFFICIENT_ACCESS );
435 case LDAP_MOD_DELETE:
436 if ( mlist->ml_bvalues == NULL ) {
437 if ( ! acl_access_allowed( a, be, conn, e,
438 NULL, op, ACL_WRITE, edn, matches) )
440 return( LDAP_INSUFFICIENT_ACCESS );
444 for ( i = 0; mlist->ml_bvalues[i] != NULL; i++ ) {
445 if ( ! acl_access_allowed( a, be, conn, e, mlist->ml_bvalues[i],
446 op, ACL_WRITE, edn, matches) )
448 return( LDAP_INSUFFICIENT_ACCESS );
455 return( LDAP_SUCCESS );
475 for ( dp = newbuf, sp = pat; size < bufsiz && *sp ; sp++) {
476 /* did we previously see a $ */
481 } else if (*sp >= '0' && *sp <= '9' ) {
488 i = matches[n].rm_so;
489 l = matches[n].rm_eo;
490 for ( ; size < 512 && i < l; size++, i++ ) {
508 Debug( LDAP_DEBUG_TRACE, "=> string_expand: pattern: %s\n", pat, 0, 0 );
509 Debug( LDAP_DEBUG_TRACE, "=> string_expand: expanded: %s\n", newbuf, 0, 0 );
514 char *pat, /* pattern to expand and match against */
515 char *str, /* string to match against pattern */
516 char *buf, /* buffer with $N expansion variables */
517 regmatch_t *matches /* offsets in buffer for $N expansion variables */
524 if(str == NULL) str = "";
526 string_expand(newbuf, sizeof(newbuf), pat, buf, matches);
527 if (( rc = regcomp(&re, newbuf, REG_EXTENDED|REG_ICASE))) {
529 regerror(rc, &re, error, sizeof(error));
531 Debug( LDAP_DEBUG_TRACE,
532 "compile( \"%s\", \"%s\") failed %s\n",
537 rc = regexec(&re, str, 0, NULL, 0);
540 Debug( LDAP_DEBUG_TRACE,
541 "=> regex_matches: string: %s\n", str, 0, 0 );
542 Debug( LDAP_DEBUG_TRACE,
543 "=> regex_matches: rc: %d %s\n",
544 rc, !rc ? "matches" : "no matches", 0 );