2 * Copyright 1998-2003 The OpenLDAP Foundation, All Rights Reserved.
3 * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
6 * Copyright (c) 2000, Mark Adamson, Carnegie Mellon. All rights reserved.
7 * This software is not subject to any license of Carnegie Mellon University.
9 * Redistribution and use in source and binary forms are permitted without
10 * restriction or fee of any kind as long as this notice is preserved.
12 * The name "Carnegie Mellon" must not be used to endorse or promote
13 * products derived from this software without prior written permission.
21 #include <ac/stdlib.h>
22 #include <ac/string.h>
30 #define SASLREGEX_REPLACE 10
32 typedef struct sasl_regexp {
33 char *sr_match; /* regexp match pattern */
34 char *sr_replace; /* regexp replace pattern */
35 regex_t sr_workspace; /* workspace for regexp engine */
36 regmatch_t sr_strings[SASLREGEX_REPLACE]; /* strings matching $1,$2 ... */
37 int sr_offset[SASLREGEX_REPLACE+2]; /* offsets of $1,$2... in *replace */
40 static int nSaslRegexp = 0;
41 static SaslRegexp_t *SaslRegexp = NULL;
43 /* What SASL proxy authorization policies are allowed? */
44 #define SASL_AUTHZ_NONE 0
45 #define SASL_AUTHZ_FROM 1
46 #define SASL_AUTHZ_TO 2
48 static int authz_policy = SASL_AUTHZ_NONE;
50 int slap_sasl_setpolicy( const char *arg )
52 int rc = LDAP_SUCCESS;
54 if ( strcasecmp( arg, "none" ) == 0 ) {
55 authz_policy = SASL_AUTHZ_NONE;
56 } else if ( strcasecmp( arg, "from" ) == 0 ) {
57 authz_policy = SASL_AUTHZ_FROM;
58 } else if ( strcasecmp( arg, "to" ) == 0 ) {
59 authz_policy = SASL_AUTHZ_TO;
60 } else if ( strcasecmp( arg, "both" ) == 0 ) {
61 authz_policy = SASL_AUTHZ_FROM | SASL_AUTHZ_TO;
68 /* URI format: ldap://<host>/<base>[?[<attrs>][?[<scope>][?[<filter>]]]] */
70 static int slap_parseURI( struct berval *uri,
71 struct berval *searchbase, int *scope, Filter **filter )
77 assert( uri != NULL && uri->bv_val != NULL );
78 searchbase->bv_val = NULL;
79 searchbase->bv_len = 0;
84 LDAP_LOG( TRANSPORT, ENTRY,
85 "slap_parseURI: parsing %s\n", uri->bv_val, 0, 0 );
87 Debug( LDAP_DEBUG_TRACE, "slap_parseURI: parsing %s\n", uri->bv_val, 0, 0 );
90 /* If it does not look like a URI, assume it is a DN */
91 if( !strncasecmp( uri->bv_val, "dn:", sizeof("dn:")-1 ) ) {
92 bv.bv_val = uri->bv_val + sizeof("dn:")-1;
93 bv.bv_val += strspn( bv.bv_val, " " );
95 is_dn: bv.bv_len = uri->bv_len - (bv.bv_val - uri->bv_val);
97 rc = dnNormalize2( NULL, &bv, searchbase );
98 if( rc == LDAP_SUCCESS ) {
99 *scope = LDAP_SCOPE_BASE;
104 rc = ldap_url_parse( uri->bv_val, &ludp );
105 if ( rc == LDAP_URL_ERR_BADSCHEME ) {
106 bv.bv_val = uri->bv_val;
110 if ( rc != LDAP_URL_SUCCESS ) {
111 return LDAP_PROTOCOL_ERROR;
114 if (( ludp->lud_host && *ludp->lud_host )
115 || ludp->lud_attrs || ludp->lud_exts )
117 /* host part should be empty */
118 /* attrs and extensions parts should be empty */
119 return LDAP_PROTOCOL_ERROR;
123 *scope = ludp->lud_scope;
125 /* Grab the filter */
126 if ( ludp->lud_filter ) {
127 *filter = str2filter( ludp->lud_filter );
128 if ( *filter == NULL ) {
129 rc = LDAP_PROTOCOL_ERROR;
134 /* Grab the searchbase */
135 bv.bv_val = ludp->lud_dn;
136 bv.bv_len = strlen( bv.bv_val );
137 rc = dnNormalize2( NULL, &bv, searchbase );
140 if( rc != LDAP_SUCCESS ) {
141 if( *filter ) filter_free( *filter );
144 ldap_free_urldesc( ludp );
148 static int slap_sasl_rx_off(char *rep, int *off)
153 /* Precompile replace pattern. Find the $<n> placeholders */
156 for ( c = rep; *c; c++ ) {
157 if ( *c == '\\' && c[1] ) {
162 if ( n == SASLREGEX_REPLACE ) {
164 LDAP_LOG( TRANSPORT, ERR,
165 "slap_sasl_rx_off: \"%s\" has too many $n "
166 "placeholders (max %d)\n", rep, SASLREGEX_REPLACE, 0 );
168 Debug( LDAP_DEBUG_ANY,
169 "SASL replace pattern %s has too many $n "
170 "placeholders (max %d)\n",
171 rep, SASLREGEX_REPLACE, 0 );
174 return( LDAP_OTHER );
181 /* Final placeholder, after the last $n */
185 return( LDAP_SUCCESS );
188 int slap_sasl_regexp_config( const char *match, const char *replace )
193 SaslRegexp = (SaslRegexp_t *) ch_realloc( (char *) SaslRegexp,
194 (nSaslRegexp + 1) * sizeof(SaslRegexp_t) );
196 reg = &SaslRegexp[nSaslRegexp];
198 reg->sr_match = ch_strdup( match );
199 reg->sr_replace = ch_strdup( replace );
201 /* Precompile matching pattern */
202 rc = regcomp( ®->sr_workspace, reg->sr_match, REG_EXTENDED|REG_ICASE );
205 LDAP_LOG( TRANSPORT, ERR,
206 "slap_sasl_regexp_config: \"%s\" could not be compiled.\n",
207 reg->sr_match, 0, 0 );
209 Debug( LDAP_DEBUG_ANY,
210 "SASL match pattern %s could not be compiled by regexp engine\n",
211 reg->sr_match, 0, 0 );
214 return( LDAP_OTHER );
217 rc = slap_sasl_rx_off( reg->sr_replace, reg->sr_offset );
218 if ( rc != LDAP_SUCCESS ) return rc;
221 return( LDAP_SUCCESS );
225 /* Perform replacement on regexp matches */
226 static void slap_sasl_rx_exp(
230 const char *saslname,
233 int i, n, len, insert;
235 /* Get the total length of the final URI */
239 while( off[n] >= 0 ) {
240 /* Len of next section from replacement string (x,y,z above) */
241 len += off[n] - off[n-1] - 2;
245 /* Len of string from saslname that matched next $i (b,d above) */
246 i = rep[ off[n] + 1 ] - '0';
247 len += str[i].rm_eo - str[i].rm_so;
250 out->bv_val = ch_malloc( len + 1 );
253 /* Fill in URI with replace string, replacing $i as we go */
256 while( off[n] >= 0) {
257 /* Paste in next section from replacement string (x,y,z above) */
258 len = off[n] - off[n-1] - 2;
259 strncpy( out->bv_val+insert, rep + off[n-1] + 2, len);
264 /* Paste in string from saslname that matched next $i (b,d above) */
265 i = rep[ off[n] + 1 ] - '0';
266 len = str[i].rm_eo - str[i].rm_so;
267 strncpy( out->bv_val+insert, saslname + str[i].rm_so, len );
273 out->bv_val[insert] = '\0';
276 /* Take the passed in SASL name and attempt to convert it into an
277 LDAP URI to find the matching LDAP entry, using the pattern matching
278 strings given in the saslregexp config file directive(s) */
280 static int slap_sasl_regexp( struct berval *in, struct berval *out )
282 char *saslname = in->bv_val;
286 memset( out, 0, sizeof( *out ) );
289 LDAP_LOG( TRANSPORT, ENTRY,
290 "slap_sasl_regexp: converting SASL name %s\n", saslname, 0, 0 );
292 Debug( LDAP_DEBUG_TRACE, "slap_sasl_regexp: converting SASL name %s\n",
296 if (( saslname == NULL ) || ( nSaslRegexp == 0 )) {
300 /* Match the normalized SASL name to the saslregexp patterns */
301 for( reg = SaslRegexp,i=0; i<nSaslRegexp; i++,reg++ ) {
302 if ( regexec( ®->sr_workspace, saslname, SASLREGEX_REPLACE,
303 reg->sr_strings, 0) == 0 )
307 if( i >= nSaslRegexp ) return( 0 );
310 * The match pattern may have been of the form "a(b.*)c(d.*)e" and the
311 * replace pattern of the form "x$1y$2z". The returned string needs
312 * to replace the $1,$2 with the strings that matched (b.*) and (d.*)
314 slap_sasl_rx_exp( reg->sr_replace, reg->sr_offset,
315 reg->sr_strings, saslname, out );
318 LDAP_LOG( TRANSPORT, ENTRY,
319 "slap_sasl_regexp: converted SASL name to %s\n",
320 out->bv_len ? out->bv_val : "", 0, 0 );
322 Debug( LDAP_DEBUG_TRACE,
323 "slap_sasl_regexp: converted SASL name to %s\n",
324 out->bv_len ? out->bv_val : "", 0, 0 );
330 /* This callback actually does some work...*/
331 static int sasl_sc_sasl2dn( Operation *o, SlapReply *rs )
333 struct berval *ndn = o->o_callback->sc_private;
335 if (rs->sr_type != REP_SEARCH) return 0;
337 /* We only want to be called once */
343 LDAP_LOG( TRANSPORT, DETAIL1,
344 "slap_sasl2dn: search DN returned more than 1 entry\n", 0, 0, 0 );
346 Debug( LDAP_DEBUG_TRACE,
347 "slap_sasl2dn: search DN returned more than 1 entry\n", 0,0,0 );
352 ber_dupbv(ndn, &rs->sr_entry->e_nname);
357 typedef struct smatch_info {
362 static int sasl_sc_smatch( Operation *o, SlapReply *rs )
364 smatch_info *sm = o->o_callback->sc_private;
366 if (rs->sr_type != REP_SEARCH) return 0;
368 if (dn_match(sm->dn, &rs->sr_entry->e_nname)) {
370 return -1; /* short-circuit the search */
377 * Map a SASL regexp rule to a DN. If the rule is just a DN or a scope=base
378 * URI, just strcmp the rule (or its searchbase) to the *assertDN. Otherwise,
379 * the rule must be used as an internal search for entries. If that search
380 * returns the *assertDN entry, the match is successful.
382 * The assertDN should not have the dn: prefix
386 int slap_sasl_match(Connection *conn, struct berval *rule, struct berval *assertDN, struct berval *authc )
391 slap_callback cb = { sasl_sc_smatch };
393 SlapReply rs = {REP_RESULT};
396 LDAP_LOG( TRANSPORT, ENTRY,
397 "slap_sasl_match: comparing DN %s to rule %s\n",
398 assertDN->bv_val, rule->bv_val,0 );
400 Debug( LDAP_DEBUG_TRACE,
401 "===>slap_sasl_match: comparing DN %s to rule %s\n",
402 assertDN->bv_val, rule->bv_val, 0 );
405 rc = slap_parseURI( rule, &op.o_req_ndn, &op.oq_search.rs_scope, &op.oq_search.rs_filter );
406 if( rc != LDAP_SUCCESS ) goto CONCLUDED;
408 /* Massive shortcut: search scope == base */
409 if( op.oq_search.rs_scope == LDAP_SCOPE_BASE ) {
410 rc = regcomp(®, op.o_req_ndn.bv_val,
411 REG_EXTENDED|REG_ICASE|REG_NOSUB);
413 rc = regexec(®, assertDN->bv_val, 0, NULL, 0);
419 rc = LDAP_INAPPROPRIATE_AUTH;
424 /* Must run an internal search. */
427 LDAP_LOG( TRANSPORT, DETAIL1,
428 "slap_sasl_match: performing internal search (base=%s, scope=%d)\n",
429 op.o_req_ndn.bv_val, op.oq_search.rs_scope, 0 );
431 Debug( LDAP_DEBUG_TRACE,
432 "slap_sasl_match: performing internal search (base=%s, scope=%d)\n",
433 op.o_req_ndn.bv_val, op.oq_search.rs_scope, 0 );
436 op.o_bd = select_backend( &op.o_req_ndn, 0, 1 );
437 if(( op.o_bd == NULL ) || ( op.o_bd->be_search == NULL)) {
438 rc = LDAP_INAPPROPRIATE_AUTH;
446 op.o_tag = LDAP_REQ_SEARCH;
447 op.o_protocol = LDAP_VERSION3;
450 op.o_time = slap_get_time();
451 op.o_do_not_cache = 1;
452 op.o_is_auth_check = 1;
453 op.o_threadctx = conn->c_sasl_bindop->o_threadctx;
455 op.o_connid = conn->c_connid;
457 op.o_bd->be_search( &op, &rs );
462 rc = LDAP_INAPPROPRIATE_AUTH;
466 if( op.o_req_ndn.bv_len ) ch_free( op.o_req_ndn.bv_val );
467 if( op.oq_search.rs_filter ) filter_free( op.oq_search.rs_filter );
470 LDAP_LOG( TRANSPORT, ENTRY,
471 "slap_sasl_match: comparison returned %d\n", rc, 0, 0 );
473 Debug( LDAP_DEBUG_TRACE,
474 "<===slap_sasl_match: comparison returned %d\n", rc, 0, 0);
482 * This function answers the question, "Can this ID authorize to that ID?",
483 * based on authorization rules. The rules are stored in the *searchDN, in the
484 * attribute named by *attr. If any of those rules map to the *assertDN, the
485 * authorization is approved.
487 * The DNs should not have the dn: prefix
490 slap_sasl_check_authz( Connection *conn,
491 struct berval *searchDN,
492 struct berval *assertDN,
493 AttributeDescription *ad,
494 struct berval *authc )
500 LDAP_LOG( TRANSPORT, ENTRY,
501 "slap_sasl_check_authz: does %s match %s rule in %s?\n",
502 assertDN->bv_val, ad->ad_cname.bv_val, searchDN->bv_val);
504 Debug( LDAP_DEBUG_TRACE,
505 "==>slap_sasl_check_authz: does %s match %s rule in %s?\n",
506 assertDN->bv_val, ad->ad_cname.bv_val, searchDN->bv_val);
509 rc = backend_attribute( conn->c_sasl_bindop, NULL,
510 searchDN, ad, &vals );
511 if( rc != LDAP_SUCCESS ) goto COMPLETE;
513 /* Check if the *assertDN matches any **vals */
514 for( i=0; vals[i].bv_val != NULL; i++ ) {
515 rc = slap_sasl_match( conn, &vals[i], assertDN, authc );
516 if ( rc == LDAP_SUCCESS ) goto COMPLETE;
518 rc = LDAP_INAPPROPRIATE_AUTH;
521 if( vals ) ber_bvarray_free( vals );
524 LDAP_LOG( TRANSPORT, RESULTS,
525 "slap_sasl_check_authz: %s check returning %s\n",
526 ad->ad_cname.bv_val, rc, 0 );
528 Debug( LDAP_DEBUG_TRACE,
529 "<==slap_sasl_check_authz: %s check returning %d\n",
530 ad->ad_cname.bv_val, rc, 0);
537 * Given a SASL name (e.g. "UID=name,cn=REALM,cn=MECH,cn=AUTH")
538 * return the LDAP DN to which it matches. The SASL regexp rules in the config
539 * file turn the SASL name into an LDAP URI. If the URI is just a DN (or a
540 * search with scope=base), just return the URI (or its searchbase). Otherwise
541 * an internal search must be done, and if that search returns exactly one
542 * entry, return the DN of that one entry.
544 void slap_sasl2dn( Connection *conn,
545 struct berval *saslname, struct berval *sasldn )
548 slap_callback cb = { sasl_sc_sasl2dn };
550 SlapReply rs = {REP_RESULT};
551 struct berval regout = { 0, NULL };
554 LDAP_LOG( TRANSPORT, ENTRY,
555 "slap_sasl2dn: converting SASL name %s to DN.\n",
556 saslname->bv_val, 0, 0 );
558 Debug( LDAP_DEBUG_TRACE, "==>slap_sasl2dn: "
559 "converting SASL name %s to a DN\n",
560 saslname->bv_val, 0,0 );
563 sasldn->bv_val = NULL;
565 cb.sc_private = sasldn;
567 /* Convert the SASL name into a minimal URI */
568 if( !slap_sasl_regexp( saslname, ®out ) ) {
572 rc = slap_parseURI( ®out, &op.o_req_ndn, &op.oq_search.rs_scope, &op.oq_search.rs_filter );
573 if( regout.bv_val ) ch_free( regout.bv_val );
574 if( rc != LDAP_SUCCESS ) {
578 /* Must do an internal search */
579 op.o_bd = select_backend( &op.o_req_ndn, 0, 1 );
581 /* Massive shortcut: search scope == base */
582 if( op.oq_search.rs_scope == LDAP_SCOPE_BASE ) {
583 *sasldn = op.o_req_ndn;
584 op.o_req_ndn.bv_len = 0;
585 op.o_req_ndn.bv_val = NULL;
590 LDAP_LOG( TRANSPORT, DETAIL1,
591 "slap_sasl2dn: performing internal search (base=%s, scope=%d)\n",
592 op.o_req_ndn.bv_val, op.oq_search.rs_scope, 0 );
594 Debug( LDAP_DEBUG_TRACE,
595 "slap_sasl2dn: performing internal search (base=%s, scope=%d)\n",
596 op.o_req_ndn.bv_val, op.oq_search.rs_scope, 0 );
599 if(( op.o_bd == NULL ) || ( op.o_bd->be_search == NULL)) {
604 op.o_connid = conn->c_connid;
605 op.o_tag = LDAP_REQ_SEARCH;
606 op.o_protocol = LDAP_VERSION3;
607 op.o_ndn = conn->c_ndn;
609 op.o_time = slap_get_time();
610 op.o_do_not_cache = 1;
611 op.o_is_auth_check = 1;
612 op.o_threadctx = conn->c_sasl_bindop ? conn->c_sasl_bindop->o_threadctx:
613 ldap_pvt_thread_pool_context( &connection_pool );
614 op.oq_search.rs_deref = LDAP_DEREF_NEVER;
615 op.oq_search.rs_slimit = 1;
616 op.oq_search.rs_attrsonly = 1;
618 op.o_bd->be_search( &op, &rs );
621 if( sasldn->bv_len ) {
622 conn->c_authz_backend = op.o_bd;
624 if( op.o_req_ndn.bv_len ) ch_free( op.o_req_ndn.bv_val );
625 if( op.oq_search.rs_filter ) filter_free( op.oq_search.rs_filter );
628 LDAP_LOG( TRANSPORT, ENTRY,
629 "slap_sasl2dn: Converted SASL name to %s\n",
630 sasldn->bv_len ? sasldn->bv_val : "<nothing>", 0, 0 );
632 Debug( LDAP_DEBUG_TRACE, "<==slap_sasl2dn: Converted SASL name to %s\n",
633 sasldn->bv_len ? sasldn->bv_val : "<nothing>", 0, 0 );
640 /* Check if a bind can SASL authorize to another identity.
641 * The DNs should not have the dn: prefix
644 int slap_sasl_authorized( Connection *conn,
645 struct berval *authcDN, struct berval *authzDN )
647 int rc = LDAP_INAPPROPRIATE_AUTH;
649 /* User binding as anonymous */
650 if ( authzDN == NULL ) {
656 LDAP_LOG( TRANSPORT, ENTRY,
657 "slap_sasl_authorized: can %s become %s?\n",
658 authcDN->bv_val, authzDN->bv_val, 0 );
660 Debug( LDAP_DEBUG_TRACE,
661 "==>slap_sasl_authorized: can %s become %s?\n",
662 authcDN->bv_val, authzDN->bv_val, 0 );
665 /* If person is authorizing to self, succeed */
666 if ( dn_match( authcDN, authzDN ) ) {
671 /* Allow the manager to authorize as any DN. */
672 if( conn->c_authz_backend && be_isroot( conn->c_authz_backend, authcDN )) {
677 /* Check source rules */
678 if( authz_policy & SASL_AUTHZ_TO ) {
679 rc = slap_sasl_check_authz( conn, authcDN, authzDN,
680 slap_schema.si_ad_saslAuthzTo, authcDN );
681 if( rc == LDAP_SUCCESS ) {
686 /* Check destination rules */
687 if( authz_policy & SASL_AUTHZ_FROM ) {
688 rc = slap_sasl_check_authz( conn, authzDN, authcDN,
689 slap_schema.si_ad_saslAuthzFrom, authcDN );
690 if( rc == LDAP_SUCCESS ) {
695 rc = LDAP_INAPPROPRIATE_AUTH;
700 LDAP_LOG( TRANSPORT, RESULTS, "slap_sasl_authorized: return %d\n", rc,0,0 );
702 Debug( LDAP_DEBUG_TRACE,
703 "<== slap_sasl_authorized: return %d\n", rc, 0, 0 );