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_no_usermod_attr( 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_dn_pat != NULL) {
127 Debug( LDAP_DEBUG_TRACE, "=> dnpat: [%d] %s nsub: %d\n",
128 i, a->acl_dn_pat, (int) a->acl_dn_re.re_nsub);
130 if (regexec(&a->acl_dn_re, edn, nmatch, matches, 0)) {
134 Debug( LDAP_DEBUG_TRACE, "=> acl_get:[%d] backend ACL match\n",
139 if ( a->acl_filter != NULL ) {
140 if ( test_filter( NULL, NULL, NULL, e, a->acl_filter ) != 0 ) {
145 Debug( LDAP_DEBUG_ARGS, "=> acl_get: [%d] check attr %s\n", i, attr, 0);
147 if ( attr == NULL || a->acl_attrs == NULL ||
148 charray_inlist( a->acl_attrs, attr ) )
150 Debug( LDAP_DEBUG_ACL, "<= acl_get: [%d] backend acl %s attr: %s\n",
154 matches[0].rm_so = matches[0].rm_eo = -1;
157 /* check for a global acl that matches the entry */
158 for ( i = 1, a = global_acl; a != NULL; a = a->acl_next, i++ ) {
159 if (a->acl_dn_pat != NULL) {
160 Debug( LDAP_DEBUG_TRACE, "=> dn pat: [%d] %s nsub: %d\n",
161 i, a->acl_dn_pat, (int) a->acl_dn_re.re_nsub);
163 if (regexec(&a->acl_dn_re, edn, nmatch, matches, 0)) {
167 Debug( LDAP_DEBUG_TRACE, "=> acl_get: [%d] global ACL match\n",
172 if ( a->acl_filter != NULL ) {
173 if ( test_filter( NULL, NULL, NULL, e, a->acl_filter ) != 0 ) {
178 Debug( LDAP_DEBUG_ARGS, "=> acl_get: [%d] check attr\n", i, 0, 0);
180 if ( attr == NULL || a->acl_attrs == NULL ||
181 charray_inlist( a->acl_attrs, attr ) )
183 Debug( LDAP_DEBUG_ACL, "<= acl_get: [%d] global acl %s attr: %s\n",
188 matches[0].rm_so = matches[0].rm_eo = -1;
191 Debug( LDAP_DEBUG_ACL, "<= acl_get: no match\n", 0, 0, 0 );
196 * acl_access_allowed - check whether the given acl allows dn the
197 * requested access to entry e, attribute attr, value val. if val
198 * is null, access to the whole attribute is assumed (all values).
200 * 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 );
247 for ( i = 1, b = a->acl_access; b != NULL; b = b->a_next, i++ ) {
248 /* AND <who> clauses */
249 if ( b->a_dn_pat != NULL ) {
250 Debug( LDAP_DEBUG_TRACE, "<= check a_dn_pat: %s\n",
253 * if access applies to the entry itself, and the
254 * user is bound as somebody in the same namespace as
255 * the entry, OR the given dn matches the dn pattern
257 if ( strcasecmp( b->a_dn_pat, "anonymous" ) == 0 ) {
258 if (op->o_ndn != NULL && op->o_ndn[0] != '\0' ) {
262 } else if ( strcasecmp( b->a_dn_pat, "self" ) == 0 ) {
263 if( op->o_ndn == NULL || op->o_ndn[0] == '\0' ) {
267 if ( e->e_dn == NULL || strcmp( edn, op->o_ndn ) != 0 ) {
271 } else if ( strcmp( b->a_dn_pat, ".*" ) != 0 &&
272 !regex_matches( b->a_dn_pat, op->o_ndn, edn, matches ) )
278 if ( b->a_url_pat != NULL ) {
279 Debug( LDAP_DEBUG_ARGS, "<= check a_url_pat: %s\n",
280 b->a_url_pat, 0, 0 );
282 if ( strcmp( b->a_url_pat, ".*" ) != 0 &&
283 !regex_matches( b->a_url_pat, conn->c_listener_url,
290 if ( b->a_domain_pat != NULL ) {
291 Debug( LDAP_DEBUG_ARGS, "<= check a_domain_pat: %s\n",
292 b->a_domain_pat, 0, 0 );
294 if ( strcmp( b->a_domain_pat, ".*" ) != 0 &&
295 !regex_matches( b->a_domain_pat, conn->c_peer_domain,
302 if ( b->a_peername_pat != NULL ) {
303 Debug( LDAP_DEBUG_ARGS, "<= check a_peername_path: %s\n",
304 b->a_peername_pat, 0, 0 );
306 if ( strcmp( b->a_peername_pat, ".*" ) != 0 &&
307 !regex_matches( b->a_peername_pat, conn->c_peer_name,
314 if ( b->a_sockname_pat != NULL ) {
315 Debug( LDAP_DEBUG_ARGS, "<= check a_sockname_path: %s\n",
316 b->a_sockname_pat, 0, 0 );
318 if ( strcmp( b->a_sockname_pat, ".*" ) != 0 &&
319 !regex_matches( b->a_sockname_pat, conn->c_sock_name,
326 if ( b->a_dn_at != NULL && op->o_ndn != NULL ) {
330 Debug( LDAP_DEBUG_ARGS, "<= check a_dn_at: %s\n",
333 bv.bv_val = op->o_ndn;
334 bv.bv_len = strlen( bv.bv_val );
336 /* see if asker is listed in dnattr */
337 if ( (at = attr_find( e->e_attrs, b->a_dn_at )) != NULL &&
338 value_find( at->a_vals, &bv, at->a_syntax, 3 ) == 0 )
340 if ( ACL_IS_SELF(b->a_access) &&
341 (val == NULL || value_cmp( &bv, val, at->a_syntax, 2 )) )
346 /* asker not listed in dnattr - check for self access */
347 } else if ( ! ACL_IS_SELF(b->a_access) || val == NULL ||
348 value_cmp( &bv, val, at->a_syntax, 2 ) != 0 )
354 if ( b->a_group_pat != NULL && op->o_ndn != NULL ) {
357 /* b->a_group is an unexpanded entry name, expanded it should be an
358 * entry with objectclass group* and we test to see if odn is one of
359 * the values in the attribute group
361 /* see if asker is listed in dnattr */
362 string_expand(buf, sizeof(buf), b->a_group_pat, edn, matches);
363 (void) dn_normalize_case(buf);
365 if (backend_group(be, e, buf, op->o_ndn,
366 b->a_group_oc, b->a_group_at) != 0)
372 Debug( LDAP_DEBUG_ACL,
373 "<= acl_access_allowed: matched by clause #%d access %s\n",
375 ACL_GRANT(b->a_access, access) ? "granted" : "denied",
378 return ACL_GRANT(b->a_access, access );
381 Debug( LDAP_DEBUG_ACL,
382 "<= acl_access_allowed: %s by default (no matching by)\n",
383 default_access >= access ? "granted" : "denied", 0, 0 );
385 return( default_access >= access );
389 * acl_check_modlist - check access control on the given entry to see if
390 * it allows the given modifications by the user associated with op.
391 * returns LDAP_SUCCESS mods allowed ok
392 * anything else mods not allowed - return is an error
393 * code indicating the problem
407 char *edn = e->e_ndn;
409 for ( ; mlist != NULL; mlist = mlist->ml_next ) {
410 regmatch_t matches[MAXREMATCHES];
412 /* the lastmod attributes are ignored by ACL checking */
413 if ( oc_check_no_usermod_attr( mlist->ml_type ) ) {
414 Debug( LDAP_DEBUG_ACL, "Operational attribute: %s access allowed\n",
415 mlist->ml_type, 0, 0 );
419 a = acl_get_applicable( be, op, e, mlist->ml_type,
420 MAXREMATCHES, matches );
422 switch ( mlist->ml_op & ~LDAP_MOD_BVALUES ) {
423 case LDAP_MOD_REPLACE:
425 if ( mlist->ml_bvalues == NULL ) {
428 for ( i = 0; mlist->ml_bvalues[i] != NULL; i++ ) {
429 if ( ! acl_access_allowed( a, be, conn, e, mlist->ml_bvalues[i],
430 op, ACL_WRITE, edn, matches) )
432 return( LDAP_INSUFFICIENT_ACCESS );
437 case LDAP_MOD_DELETE:
438 if ( mlist->ml_bvalues == NULL ) {
439 if ( ! acl_access_allowed( a, be, conn, e,
440 NULL, op, ACL_WRITE, edn, matches) )
442 return( LDAP_INSUFFICIENT_ACCESS );
446 for ( i = 0; mlist->ml_bvalues[i] != NULL; i++ ) {
447 if ( ! acl_access_allowed( a, be, conn, e, mlist->ml_bvalues[i],
448 op, ACL_WRITE, edn, matches) )
450 return( LDAP_INSUFFICIENT_ACCESS );
457 return( LDAP_SUCCESS );
477 for ( dp = newbuf, sp = pat; size < bufsiz && *sp ; sp++) {
478 /* did we previously see a $ */
483 } else if (*sp >= '0' && *sp <= '9' ) {
490 i = matches[n].rm_so;
491 l = matches[n].rm_eo;
492 for ( ; size < 512 && i < l; size++, i++ ) {
510 Debug( LDAP_DEBUG_TRACE, "=> string_expand: pattern: %s\n", pat, 0, 0 );
511 Debug( LDAP_DEBUG_TRACE, "=> string_expand: expanded: %s\n", newbuf, 0, 0 );
516 char *pat, /* pattern to expand and match against */
517 char *str, /* string to match against pattern */
518 char *buf, /* buffer with $N expansion variables */
519 regmatch_t *matches /* offsets in buffer for $N expansion variables */
526 if(str == NULL) str = "";
528 string_expand(newbuf, sizeof(newbuf), pat, buf, matches);
529 if (( rc = regcomp(&re, newbuf, REG_EXTENDED|REG_ICASE))) {
531 regerror(rc, &re, error, sizeof(error));
533 Debug( LDAP_DEBUG_TRACE,
534 "compile( \"%s\", \"%s\") failed %s\n",
539 rc = regexec(&re, str, 0, NULL, 0);
542 Debug( LDAP_DEBUG_TRACE,
543 "=> regex_matches: string: %s\n", str, 0, 0 );
544 Debug( LDAP_DEBUG_TRACE,
545 "=> regex_matches: rc: %d %s\n",
546 rc, !rc ? "matches" : "no matches", 0 );