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 /* Two empty callback functions to avoid sending results */
331 void slap_cb_null_response( Operation *o, SlapReply *rs )
335 void slap_cb_null_sresult( Operation *o, SlapReply *rs )
339 int slap_cb_null_sreference( Operation *o, SlapReply *rs )
344 /* This callback actually does some work...*/
345 static int sasl_sc_sasl2dn( Operation *o, SlapReply *rs )
347 struct berval *ndn = o->o_callback->sc_private;
349 /* We only want to be called once */
355 LDAP_LOG( TRANSPORT, DETAIL1,
356 "slap_sasl2dn: search DN returned more than 1 entry\n", 0, 0, 0 );
358 Debug( LDAP_DEBUG_TRACE,
359 "slap_sasl2dn: search DN returned more than 1 entry\n", 0,0,0 );
364 ber_dupbv(ndn, &rs->sr_entry->e_nname);
369 typedef struct smatch_info {
374 static int sasl_sc_smatch( Operation *o, SlapReply *rs )
376 smatch_info *sm = o->o_callback->sc_private;
378 if (dn_match(sm->dn, &rs->sr_entry->e_nname)) {
380 return -1; /* short-circuit the search */
387 * Map a SASL regexp rule to a DN. If the rule is just a DN or a scope=base
388 * URI, just strcmp the rule (or its searchbase) to the *assertDN. Otherwise,
389 * the rule must be used as an internal search for entries. If that search
390 * returns the *assertDN entry, the match is successful.
392 * The assertDN should not have the dn: prefix
396 int slap_sasl_match(Connection *conn, struct berval *rule, struct berval *assertDN, struct berval *authc )
402 slap_cb_null_response,
403 slap_cb_null_sresult,
405 slap_cb_null_sreference
408 SlapReply rs = {REP_RESULT};
411 LDAP_LOG( TRANSPORT, ENTRY,
412 "slap_sasl_match: comparing DN %s to rule %s\n",
413 assertDN->bv_val, rule->bv_val,0 );
415 Debug( LDAP_DEBUG_TRACE,
416 "===>slap_sasl_match: comparing DN %s to rule %s\n",
417 assertDN->bv_val, rule->bv_val, 0 );
420 rc = slap_parseURI( rule, &op.o_req_ndn, &op.oq_search.rs_scope, &op.oq_search.rs_filter );
421 if( rc != LDAP_SUCCESS ) goto CONCLUDED;
423 /* Massive shortcut: search scope == base */
424 if( op.oq_search.rs_scope == LDAP_SCOPE_BASE ) {
425 rc = regcomp(®, op.o_req_ndn.bv_val,
426 REG_EXTENDED|REG_ICASE|REG_NOSUB);
428 rc = regexec(®, assertDN->bv_val, 0, NULL, 0);
434 rc = LDAP_INAPPROPRIATE_AUTH;
439 /* Must run an internal search. */
442 LDAP_LOG( TRANSPORT, DETAIL1,
443 "slap_sasl_match: performing internal search (base=%s, scope=%d)\n",
444 op.o_req_ndn.bv_val, op.oq_search.rs_scope, 0 );
446 Debug( LDAP_DEBUG_TRACE,
447 "slap_sasl_match: performing internal search (base=%s, scope=%d)\n",
448 op.o_req_ndn.bv_val, op.oq_search.rs_scope, 0 );
451 op.o_bd = select_backend( &op.o_req_ndn, 0, 1 );
452 if(( op.o_bd == NULL ) || ( op.o_bd->be_search == NULL)) {
453 rc = LDAP_INAPPROPRIATE_AUTH;
461 op.o_tag = LDAP_REQ_SEARCH;
462 op.o_protocol = LDAP_VERSION3;
465 op.o_time = slap_get_time();
466 op.o_do_not_cache = 1;
467 op.o_is_auth_check = 1;
468 op.o_threadctx = conn->c_sasl_bindop->o_threadctx;
470 op.o_connid = conn->c_connid;
472 op.o_bd->be_search( &op, &rs );
477 rc = LDAP_INAPPROPRIATE_AUTH;
481 if( op.o_req_ndn.bv_len ) ch_free( op.o_req_ndn.bv_val );
482 if( op.oq_search.rs_filter ) filter_free( op.oq_search.rs_filter );
485 LDAP_LOG( TRANSPORT, ENTRY,
486 "slap_sasl_match: comparison returned %d\n", rc, 0, 0 );
488 Debug( LDAP_DEBUG_TRACE,
489 "<===slap_sasl_match: comparison returned %d\n", rc, 0, 0);
497 * This function answers the question, "Can this ID authorize to that ID?",
498 * based on authorization rules. The rules are stored in the *searchDN, in the
499 * attribute named by *attr. If any of those rules map to the *assertDN, the
500 * authorization is approved.
502 * The DNs should not have the dn: prefix
505 slap_sasl_check_authz( Connection *conn,
506 struct berval *searchDN,
507 struct berval *assertDN,
508 AttributeDescription *ad,
509 struct berval *authc )
515 LDAP_LOG( TRANSPORT, ENTRY,
516 "slap_sasl_check_authz: does %s match %s rule in %s?\n",
517 assertDN->bv_val, ad->ad_cname.bv_val, searchDN->bv_val);
519 Debug( LDAP_DEBUG_TRACE,
520 "==>slap_sasl_check_authz: does %s match %s rule in %s?\n",
521 assertDN->bv_val, ad->ad_cname.bv_val, searchDN->bv_val);
524 rc = backend_attribute( conn->c_sasl_bindop, NULL,
525 searchDN, ad, &vals );
526 if( rc != LDAP_SUCCESS ) goto COMPLETE;
528 /* Check if the *assertDN matches any **vals */
529 for( i=0; vals[i].bv_val != NULL; i++ ) {
530 rc = slap_sasl_match( conn, &vals[i], assertDN, authc );
531 if ( rc == LDAP_SUCCESS ) goto COMPLETE;
533 rc = LDAP_INAPPROPRIATE_AUTH;
536 if( vals ) ber_bvarray_free( vals );
539 LDAP_LOG( TRANSPORT, RESULTS,
540 "slap_sasl_check_authz: %s check returning %s\n",
541 ad->ad_cname.bv_val, rc, 0 );
543 Debug( LDAP_DEBUG_TRACE,
544 "<==slap_sasl_check_authz: %s check returning %d\n",
545 ad->ad_cname.bv_val, rc, 0);
552 * Given a SASL name (e.g. "UID=name,cn=REALM,cn=MECH,cn=AUTH")
553 * return the LDAP DN to which it matches. The SASL regexp rules in the config
554 * file turn the SASL name into an LDAP URI. If the URI is just a DN (or a
555 * search with scope=base), just return the URI (or its searchbase). Otherwise
556 * an internal search must be done, and if that search returns exactly one
557 * entry, return the DN of that one entry.
559 void slap_sasl2dn( Connection *conn,
560 struct berval *saslname, struct berval *sasldn )
563 slap_callback cb = { slap_cb_null_response,
564 slap_cb_null_sresult, sasl_sc_sasl2dn, slap_cb_null_sreference, NULL};
566 SlapReply rs = {REP_RESULT};
567 struct berval regout = { 0, NULL };
570 LDAP_LOG( TRANSPORT, ENTRY,
571 "slap_sasl2dn: converting SASL name %s to DN.\n",
572 saslname->bv_val, 0, 0 );
574 Debug( LDAP_DEBUG_TRACE, "==>slap_sasl2dn: "
575 "converting SASL name %s to a DN\n",
576 saslname->bv_val, 0,0 );
579 sasldn->bv_val = NULL;
581 cb.sc_private = sasldn;
583 /* Convert the SASL name into a minimal URI */
584 if( !slap_sasl_regexp( saslname, ®out ) ) {
588 rc = slap_parseURI( ®out, &op.o_req_ndn, &op.oq_search.rs_scope, &op.oq_search.rs_filter );
589 if( regout.bv_val ) ch_free( regout.bv_val );
590 if( rc != LDAP_SUCCESS ) {
594 /* Must do an internal search */
595 op.o_bd = select_backend( &op.o_req_ndn, 0, 1 );
597 /* Massive shortcut: search scope == base */
598 if( op.oq_search.rs_scope == LDAP_SCOPE_BASE ) {
599 *sasldn = op.o_req_ndn;
600 op.o_req_ndn.bv_len = 0;
601 op.o_req_ndn.bv_val = NULL;
606 LDAP_LOG( TRANSPORT, DETAIL1,
607 "slap_sasl2dn: performing internal search (base=%s, scope=%d)\n",
608 op.o_req_ndn.bv_val, op.oq_search.rs_scope, 0 );
610 Debug( LDAP_DEBUG_TRACE,
611 "slap_sasl2dn: performing internal search (base=%s, scope=%d)\n",
612 op.o_req_ndn.bv_val, op.oq_search.rs_scope, 0 );
615 if(( op.o_bd == NULL ) || ( op.o_bd->be_search == NULL)) {
620 op.o_connid = conn->c_connid;
621 op.o_tag = LDAP_REQ_SEARCH;
622 op.o_protocol = LDAP_VERSION3;
623 op.o_ndn = conn->c_ndn;
625 op.o_time = slap_get_time();
626 op.o_do_not_cache = 1;
627 op.o_is_auth_check = 1;
628 op.o_threadctx = conn->c_sasl_bindop ? conn->c_sasl_bindop->o_threadctx:
629 ldap_pvt_thread_pool_context( &connection_pool );
630 op.oq_search.rs_deref = LDAP_DEREF_NEVER;
631 op.oq_search.rs_slimit = 1;
632 op.oq_search.rs_attrsonly = 1;
634 op.o_bd->be_search( &op, &rs );
637 if( sasldn->bv_len ) {
638 conn->c_authz_backend = op.o_bd;
640 if( op.o_req_ndn.bv_len ) ch_free( op.o_req_ndn.bv_val );
641 if( op.oq_search.rs_filter ) filter_free( op.oq_search.rs_filter );
644 LDAP_LOG( TRANSPORT, ENTRY,
645 "slap_sasl2dn: Converted SASL name to %s\n",
646 sasldn->bv_len ? sasldn->bv_val : "<nothing>", 0, 0 );
648 Debug( LDAP_DEBUG_TRACE, "<==slap_sasl2dn: Converted SASL name to %s\n",
649 sasldn->bv_len ? sasldn->bv_val : "<nothing>", 0, 0 );
656 /* Check if a bind can SASL authorize to another identity.
657 * The DNs should not have the dn: prefix
660 int slap_sasl_authorized( Connection *conn,
661 struct berval *authcDN, struct berval *authzDN )
663 int rc = LDAP_INAPPROPRIATE_AUTH;
665 /* User binding as anonymous */
666 if ( authzDN == NULL ) {
672 LDAP_LOG( TRANSPORT, ENTRY,
673 "slap_sasl_authorized: can %s become %s?\n",
674 authcDN->bv_val, authzDN->bv_val, 0 );
676 Debug( LDAP_DEBUG_TRACE,
677 "==>slap_sasl_authorized: can %s become %s?\n",
678 authcDN->bv_val, authzDN->bv_val, 0 );
681 /* If person is authorizing to self, succeed */
682 if ( dn_match( authcDN, authzDN ) ) {
687 /* Allow the manager to authorize as any DN. */
688 if( conn->c_authz_backend && be_isroot( conn->c_authz_backend, authcDN )) {
693 /* Check source rules */
694 if( authz_policy & SASL_AUTHZ_TO ) {
695 rc = slap_sasl_check_authz( conn, authcDN, authzDN,
696 slap_schema.si_ad_saslAuthzTo, authcDN );
697 if( rc == LDAP_SUCCESS ) {
702 /* Check destination rules */
703 if( authz_policy & SASL_AUTHZ_FROM ) {
704 rc = slap_sasl_check_authz( conn, authzDN, authcDN,
705 slap_schema.si_ad_saslAuthzFrom, authcDN );
706 if( rc == LDAP_SUCCESS ) {
711 rc = LDAP_INAPPROPRIATE_AUTH;
716 LDAP_LOG( TRANSPORT, RESULTS, "slap_sasl_authorized: return %d\n", rc,0,0 );
718 Debug( LDAP_DEBUG_TRACE,
719 "<== slap_sasl_authorized: return %d\n", rc, 0, 0 );