2 * Copyright (c) 2000, Mark Adamson, Carnegie Mellon. All rights reserved.
3 * This software is not subject to any license of Carnegie Mellon University.
5 * Redistribution and use in source and binary forms are permitted without
6 * restriction or fee of any kind as long as this notice is preserved.
8 * The name "Carnegie Mellon" must not be used to endorse or promote
9 * products derived from this software without prior written permission.
17 #include <ac/stdlib.h>
18 #include <ac/string.h>
22 #ifdef HAVE_CYRUS_SASL
28 /* URI format: ldap://<host>/<base>[?[<attrs>][?[<scope>][?[<filter>]]]] */
30 static int slap_parseURI( char *uri,
31 struct berval *searchbase, int *scope, Filter **filter )
38 assert( uri != NULL );
39 searchbase->bv_val = NULL;
40 searchbase->bv_len = 0;
45 LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
46 "slap_parseURI: parsing %s\n", uri ));
48 Debug( LDAP_DEBUG_TRACE, "slap_parseURI: parsing %s\n", uri, 0, 0 );
51 /* If it does not look like a URI, assume it is a DN */
52 if( !strncasecmp( uri, "dn:", sizeof("dn:")-1 ) ) {
53 uri += sizeof("dn:")-1;
54 uri += strspn( uri, " " );
56 /* FIXME: if dnNormalize actually uses input bv_len we
57 * will have to make this right.
60 rc = dnNormalize2( NULL, &bv, searchbase );
61 if (rc == LDAP_SUCCESS) {
62 *scope = LDAP_SCOPE_BASE;
67 /* FIXME: should use ldap_url_parse() */
68 if( strncasecmp( uri, "ldap://", sizeof("ldap://")-1 ) ) {
73 end = strchr( uri + (sizeof("ldap://")-1), '/' );
75 return( LDAP_PROTOCOL_ERROR );
77 /* could check the hostname here */
79 /* Grab the searchbase */
81 end = strchr( start, '?' );
85 return dnNormalize2( NULL, &bv, searchbase );
88 bv.bv_len = end - start;
89 rc = dnNormalize2( NULL, &bv, searchbase );
91 if (rc != LDAP_SUCCESS)
96 end = strchr( start, '?' );
98 return( LDAP_SUCCESS );
103 if( !strncasecmp( start, "base?", sizeof("base?")-1 )) {
104 *scope = LDAP_SCOPE_BASE;
105 start += sizeof("base?")-1;
107 else if( !strncasecmp( start, "one?", sizeof("one?")-1 )) {
108 *scope = LDAP_SCOPE_ONELEVEL;
109 start += sizeof("one?")-1;
111 else if( !strncasecmp( start, "sub?", sizeof("sub?")-1 )) {
112 *scope = LDAP_SCOPE_SUBTREE;
113 start += sizeof("sub?")-1;
116 free( searchbase->bv_val );
117 searchbase->bv_val = NULL;
118 return( LDAP_PROTOCOL_ERROR );
121 /* Grab the filter */
122 *filter = str2filter( start );
124 return( LDAP_SUCCESS );
128 int slap_sasl_regexp_config( const char *match, const char *replace )
130 #ifdef HAVE_CYRUS_SASL
135 SaslRegexp = (SaslRegexp_t *) ch_realloc( (char *) SaslRegexp,
136 (nSaslRegexp + 1) * sizeof(SaslRegexp_t) );
137 reg = &( SaslRegexp[nSaslRegexp] );
138 reg->match = ch_strdup( match );
139 reg->replace = ch_strdup( replace );
140 dn_normalize( reg->match );
141 dn_normalize( reg->replace );
143 /* Precompile matching pattern */
144 rc = regcomp( ®->workspace, reg->match, REG_EXTENDED|REG_ICASE );
147 LDAP_LOG(( "sasl", LDAP_LEVEL_ERR,
148 "slap_sasl_regexp_config: \"%s\" could not be compiled.\n",
151 Debug( LDAP_DEBUG_ANY,
152 "SASL match pattern %s could not be compiled by regexp engine\n",
156 return( LDAP_OPERATIONS_ERROR );
159 /* Precompile replace pattern. Find the $<n> placeholders */
162 for ( c = reg->replace; *c; c++ ) {
168 if ( n == SASLREGEX_REPLACE ) {
170 LDAP_LOG(( "sasl", LDAP_LEVEL_ERR,
171 "slap_sasl_regexp_config: \"%s\" has too many $n placeholders (max %d)\n",
172 reg->replace, SASLREGEX_REPLACE ));
174 Debug( LDAP_DEBUG_ANY,
175 "SASL replace pattern %s has too many $n placeholders (max %d)\n",
176 reg->replace, SASLREGEX_REPLACE, 0 );
179 return( LDAP_OPERATIONS_ERROR );
181 reg->offset[n] = c - reg->replace;
186 /* Final placeholder, after the last $n */
187 reg->offset[n] = c - reg->replace;
193 return( LDAP_SUCCESS );
197 #ifdef HAVE_CYRUS_SASL
199 /* Take the passed in SASL name and attempt to convert it into an
200 LDAP URI to find the matching LDAP entry, using the pattern matching
201 strings given in the saslregexp config file directive(s) */
203 char *slap_sasl_regexp( char *saslname )
206 int i, n, len, insert;
210 LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
211 "slap_sasl_regexp: converting SASL name %s\n", saslname ));
213 Debug( LDAP_DEBUG_TRACE, "slap_sasl_regexp: converting SASL name %s\n",
217 if (( saslname == NULL ) || ( nSaslRegexp == 0 ))
220 /* Match the normalized SASL name to the saslregexp patterns */
221 for( reg = SaslRegexp,i=0; i<nSaslRegexp; i++,reg++ ) {
222 if ( regexec( ®->workspace, saslname, SASLREGEX_REPLACE,
223 reg->strings, 0) == 0 )
227 if( i >= nSaslRegexp )
231 * The match pattern may have been of the form "a(b.*)c(d.*)e" and the
232 * replace pattern of the form "x$1y$2z". The returned string needs
233 * to replace the $1,$2 with the strings that matched (b.*) and (d.*)
237 /* Get the total length of the final URI */
241 while( reg->offset[n] >= 0 ) {
242 /* Len of next section from replacement string (x,y,z above) */
243 len += reg->offset[n] - reg->offset[n-1] - 2;
244 if( reg->offset[n+1] < 0)
247 /* Len of string from saslname that matched next $i (b,d above) */
248 i = reg->replace[ reg->offset[n] + 1 ] - '0';
249 len += reg->strings[i].rm_eo - reg->strings[i].rm_so;
252 uri = ch_malloc( len + 1 );
254 /* Fill in URI with replace string, replacing $i as we go */
257 while( reg->offset[n] >= 0) {
258 /* Paste in next section from replacement string (x,y,z above) */
259 len = reg->offset[n] - reg->offset[n-1] - 2;
260 strncpy( uri+insert, reg->replace + reg->offset[n-1] + 2, len);
262 if( reg->offset[n+1] < 0)
265 /* Paste in string from saslname that matched next $i (b,d above) */
266 i = reg->replace[ reg->offset[n] + 1 ] - '0';
267 len = reg->strings[i].rm_eo - reg->strings[i].rm_so;
268 strncpy( uri+insert, saslname + reg->strings[i].rm_so, len );
276 LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
277 "slap_sasl_regexp: converted SASL name to %s\n", uri ));
279 Debug( LDAP_DEBUG_TRACE,
280 "slap_sasl_regexp: converted SASL name to %s\n", uri, 0, 0 );
286 /* Two empty callback functions to avoid sending results */
287 static void sasl_sc_r( Connection *conn, Operation *o, ber_tag_t tag,
288 ber_int_t msgid, ber_int_t err, const char *matched,
289 const char *text, BVarray ref, const char *resoid,
290 struct berval *resdata, struct berval *sasldata, LDAPControl **c)
294 static void sasl_sc_s( Connection *conn, Operation *o, ber_int_t err,
295 const char *matched, const char *text, BVarray refs, LDAPControl **c,
300 /* This callback actually does some work...*/
301 static int sasl_sc_sasl2dn( BackendDB *be, Connection *conn, Operation *o,
302 Entry *e, AttributeName *an, int ao, LDAPControl **c)
304 struct berval *ndn = o->o_callback->sc_private;
306 /* We only want to be called once */
311 LDAP_LOG(( "sasl", LDAP_LEVEL_DETAIL1,
312 "slap_sasl2dn: search DN returned more than 1 entry\n" ));
314 Debug( LDAP_DEBUG_TRACE,
315 "slap_sasl2dn: search DN returned more than 1 entry\n", 0,0,0 );
319 ber_dupbv(ndn, &e->e_nname);
325 * Given a SASL name (e.g. "UID=name,cn=REALM,cn=MECH,cn=AUTH")
326 * return the LDAP DN to which it matches. The SASL regexp rules in the config
327 * file turn the SASL name into an LDAP URI. If the URI is just a DN (or a
328 * search with scope=base), just return the URI (or its searchbase). Otherwise
329 * an internal search must be done, and if that search returns exactly one
330 * entry, return the DN of that one entry.
333 char *slap_sasl2dn( char *saslname )
336 struct berval searchbase = {0, NULL};
337 struct berval dn = {0, NULL};
341 slap_callback cb = {sasl_sc_r, sasl_sc_s, sasl_sc_sasl2dn, &dn};
345 LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
346 "slap_sasl2dn: converting SASL name %s to DN.\n", saslname ));
348 Debug( LDAP_DEBUG_TRACE,
349 "==>slap_sasl2dn: Converting SASL name %s to a DN\n", saslname, 0,0 );
352 /* Convert the SASL name into an LDAP URI */
353 uri = slap_sasl_regexp( saslname );
357 rc = slap_parseURI( uri, &searchbase, &scope, &filter );
362 /* Massive shortcut: search scope == base */
363 if( scope == LDAP_SCOPE_BASE ) {
365 searchbase.bv_len = 0;
366 searchbase.bv_val = NULL;
370 /* Must do an internal search */
373 LDAP_LOG(( "sasl", LDAP_LEVEL_DETAIL1,
374 "slap_sasl2dn: performing internal search (base=%s, scope=%d)\n",
375 searchbase.bv_val, scope ));
377 Debug( LDAP_DEBUG_TRACE,
378 "slap_sasl2dn: performing internal search (base=%s, scope=%d)\n",
379 searchbase.bv_val, scope, 0 );
382 be = select_backend( &searchbase, 0, 1 );
383 if(( be == NULL ) || ( be->be_search == NULL))
385 suffix_alias( be, &searchbase );
387 ldap_pvt_thread_mutex_init( &op.o_abandonmutex );
388 op.o_tag = LDAP_REQ_SEARCH;
389 op.o_protocol = LDAP_VERSION3;
390 op.o_ndn.bv_val = saslname;
391 op.o_ndn.bv_len = strlen(saslname);
393 op.o_time = slap_get_time();
395 (*be->be_search)( be, /*conn*/NULL, &op, /*base*/NULL, &searchbase,
396 scope, /*deref=*/1, /*sizelimit=*/1, /*time=*/0, filter, /*fstr=*/NULL,
397 /*attrs=*/NULL, /*attrsonly=*/0 );
399 ldap_pvt_thread_mutex_destroy( &op.o_abandonmutex );
402 if( searchbase.bv_len ) ch_free( searchbase.bv_val );
403 if( filter ) filter_free( filter );
404 if( uri ) ch_free( uri );
407 LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
408 "slap_sasl2dn: Converted SASL name to %s\n",
409 dn.bv_len ? dn.bv_val : "<nothing>" ));
411 Debug( LDAP_DEBUG_TRACE, "<==slap_sasl2dn: Converted SASL name to %s\n",
412 dn.bv_len ? dn.bv_val : "<nothing>", 0, 0 );
418 typedef struct smatch_info {
423 static int sasl_sc_smatch( BackendDB *be, Connection *conn, Operation *o,
424 Entry *e, AttributeName *an, int ao, LDAPControl **c)
426 smatch_info *sm = o->o_callback->sc_private;
428 if (dn_match(sm->dn, &e->e_nname)) {
430 return -1; /* short-circuit the search */
437 * Map a SASL regexp rule to a DN. If the rule is just a DN or a scope=base
438 * URI, just strcmp the rule (or its searchbase) to the *assertDN. Otherwise,
439 * the rule must be used as an internal search for entries. If that search
440 * returns the *assertDN entry, the match is successful.
442 * The assertDN should not have the dn: prefix
446 int slap_sasl_match( char *rule, struct berval *assertDN, char *authc )
448 struct berval searchbase = {0, NULL};
454 slap_callback cb = {sasl_sc_r, sasl_sc_s, sasl_sc_smatch, &sm};
458 LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
459 "slap_sasl_match: comparing DN %s to rule %s\n", assertDN, rule ));
461 Debug( LDAP_DEBUG_TRACE,
462 "===>slap_sasl_match: comparing DN %s to rule %s\n", assertDN, rule, 0 );
465 rc = slap_parseURI( rule, &searchbase, &scope, &filter );
466 if( rc != LDAP_SUCCESS )
469 /* Massive shortcut: search scope == base */
470 if( scope == LDAP_SCOPE_BASE ) {
471 rc = regcomp(®, searchbase.bv_val,
472 REG_EXTENDED|REG_ICASE|REG_NOSUB);
474 rc = regexec(®, assertDN->bv_val, 0, NULL, 0);
480 rc = LDAP_INAPPROPRIATE_AUTH;
484 /* Must run an internal search. */
487 LDAP_LOG(( "sasl", LDAP_LEVEL_DETAIL1,
488 "slap_sasl_match: performing internal search (base=%s, scope=%d)\n",
489 searchbase.bv_val, scope ));
491 Debug( LDAP_DEBUG_TRACE,
492 "slap_sasl_match: performing internal search (base=%s, scope=%d)\n",
493 searchbase.bv_val, scope, 0 );
496 be = select_backend( &searchbase, 0, 1 );
497 if(( be == NULL ) || ( be->be_search == NULL)) {
498 rc = LDAP_INAPPROPRIATE_AUTH;
501 suffix_alias( be, &searchbase );
506 ldap_pvt_thread_mutex_init( &op.o_abandonmutex );
507 op.o_tag = LDAP_REQ_SEARCH;
508 op.o_protocol = LDAP_VERSION3;
509 op.o_ndn.bv_val = authc;
510 op.o_ndn.bv_len = strlen(authc);
512 op.o_time = slap_get_time();
514 (*be->be_search)( be, /*conn=*/NULL, &op, /*base=*/NULL, &searchbase,
515 scope, /*deref=*/1, /*sizelimit=*/0, /*time=*/0, filter, /*fstr=*/NULL,
516 /*attrs=*/NULL, /*attrsonly=*/0 );
521 rc = LDAP_INAPPROPRIATE_AUTH;
524 if( searchbase.bv_len ) ch_free( searchbase.bv_val );
525 if( filter ) filter_free( filter );
527 LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
528 "slap_sasl_match: comparison returned %d\n", rc ));
530 Debug( LDAP_DEBUG_TRACE,
531 "<===slap_sasl_match: comparison returned %d\n", rc, 0, 0);
539 * This function answers the question, "Can this ID authorize to that ID?",
540 * based on authorization rules. The rules are stored in the *searchDN, in the
541 * attribute named by *attr. If any of those rules map to the *assertDN, the
542 * authorization is approved.
544 * DN's passed in should have a dn: prefix
547 slap_sasl_check_authz(char *searchDN, char *assertDN, struct berval *attr, char *authc)
552 AttributeDescription *ad=NULL;
556 LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
557 "slap_sasl_check_authz: does %s match %s rule in %s?\n",
558 assertDN, attr, searchDN ));
560 Debug( LDAP_DEBUG_TRACE,
561 "==>slap_sasl_check_authz: does %s match %s rule in %s?\n",
562 assertDN, attr, searchDN);
565 rc = slap_bv2ad( attr, &ad, &errmsg );
566 if( rc != LDAP_SUCCESS )
569 bv.bv_val = searchDN+3;
570 bv.bv_len = strlen(bv.bv_val);
571 rc = backend_attribute( NULL, NULL, NULL, NULL, &bv, ad, &vals );
572 if( rc != LDAP_SUCCESS )
575 bv.bv_val = assertDN+3;
576 bv.bv_len = strlen(bv.bv_val);
577 /* Check if the *assertDN matches any **vals */
578 for( i=0; vals[i].bv_val != NULL; i++ ) {
579 rc = slap_sasl_match( vals[i].bv_val, &bv, authc );
580 if ( rc == LDAP_SUCCESS )
583 rc = LDAP_INAPPROPRIATE_AUTH;
586 if( vals ) bvarray_free( vals );
589 LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
590 "slap_sasl_check_authz: %s check returning %s\n", attr, rc ));
592 Debug( LDAP_DEBUG_TRACE,
593 "<==slap_sasl_check_authz: %s check returning %d\n", attr, rc, 0);
598 #endif /* HAVE_CYRUS_SASL */
601 /* Check if a bind can SASL authorize to another identity.
602 Accepts authorization DN's with "dn:" prefix */
604 static struct berval sasl_authz_src = {
605 sizeof(SASL_AUTHZ_SOURCE_ATTR)-1, SASL_AUTHZ_SOURCE_ATTR };
607 static struct berval sasl_authz_dst = {
608 sizeof(SASL_AUTHZ_DEST_ATTR)-1, SASL_AUTHZ_DEST_ATTR };
610 int slap_sasl_authorized( char *authcDN, char *authzDN )
612 int rc = LDAP_INAPPROPRIATE_AUTH;
614 #ifdef HAVE_CYRUS_SASL
615 /* User binding as anonymous */
616 if ( authzDN == NULL ) {
622 LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
623 "slap_sasl_authorized: can %s become %s?\n", authcDN, authzDN ));
625 Debug( LDAP_DEBUG_TRACE,
626 "==>slap_sasl_authorized: can %s become %s?\n", authcDN, authzDN, 0 );
629 /* If person is authorizing to self, succeed */
630 if ( !strcmp( authcDN, authzDN ) ) {
635 /* Check source rules */
636 rc = slap_sasl_check_authz( authcDN, authzDN, &sasl_authz_src,
638 if( rc == LDAP_SUCCESS ) {
642 /* Check destination rules */
643 rc = slap_sasl_check_authz( authzDN, authcDN, &sasl_authz_dst,
645 if( rc == LDAP_SUCCESS ) {
649 rc = LDAP_INAPPROPRIATE_AUTH;
655 LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
656 "slap_sasl_authorized: return %d\n", rc ));
658 Debug( LDAP_DEBUG_TRACE,
659 "<== slap_sasl_authorized: return %d\n", rc, 0, 0 );