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( Connection *conn, Operation *o, ber_tag_t tag,
332 ber_int_t msgid, ber_int_t err, const char *matched,
333 const char *text, BerVarray ref, const char *resoid,
334 struct berval *resdata, struct berval *sasldata, LDAPControl **c)
338 void slap_cb_null_sresult( Connection *conn, Operation *o, ber_int_t err,
339 const char *matched, const char *text, BerVarray refs, LDAPControl **c,
344 /* This callback actually does some work...*/
345 static int sasl_sc_sasl2dn( BackendDB *be, Connection *conn, Operation *o,
346 Entry *e, AttributeName *an, int ao, LDAPControl **c)
348 struct berval *ndn = o->o_callback->sc_private;
350 /* We only want to be called once */
356 LDAP_LOG( TRANSPORT, DETAIL1,
357 "slap_sasl2dn: search DN returned more than 1 entry\n", 0, 0, 0 );
359 Debug( LDAP_DEBUG_TRACE,
360 "slap_sasl2dn: search DN returned more than 1 entry\n", 0,0,0 );
365 ber_dupbv(ndn, &e->e_nname);
370 typedef struct smatch_info {
375 static int sasl_sc_smatch( BackendDB *be, Connection *conn, Operation *o,
376 Entry *e, AttributeName *an, int ao, LDAPControl **c)
378 smatch_info *sm = o->o_callback->sc_private;
380 if (dn_match(sm->dn, &e->e_nname)) {
382 return -1; /* short-circuit the search */
389 * Map a SASL regexp rule to a DN. If the rule is just a DN or a scope=base
390 * URI, just strcmp the rule (or its searchbase) to the *assertDN. Otherwise,
391 * the rule must be used as an internal search for entries. If that search
392 * returns the *assertDN entry, the match is successful.
394 * The assertDN should not have the dn: prefix
398 int slap_sasl_match(Connection *conn, struct berval *rule, struct berval *assertDN, struct berval *authc )
400 struct berval searchbase = {0, NULL};
406 slap_callback cb = { slap_cb_null_response, slap_cb_null_sresult, sasl_sc_smatch, NULL };
410 LDAP_LOG( TRANSPORT, ENTRY,
411 "slap_sasl_match: comparing DN %s to rule %s\n",
412 assertDN->bv_val, rule->bv_val,0 );
414 Debug( LDAP_DEBUG_TRACE,
415 "===>slap_sasl_match: comparing DN %s to rule %s\n",
416 assertDN->bv_val, rule->bv_val, 0 );
419 rc = slap_parseURI( rule, &searchbase, &scope, &filter );
420 if( rc != LDAP_SUCCESS ) goto CONCLUDED;
422 /* Massive shortcut: search scope == base */
423 if( scope == LDAP_SCOPE_BASE ) {
424 rc = regcomp(®, searchbase.bv_val,
425 REG_EXTENDED|REG_ICASE|REG_NOSUB);
427 rc = regexec(®, assertDN->bv_val, 0, NULL, 0);
433 rc = LDAP_INAPPROPRIATE_AUTH;
438 /* Must run an internal search. */
441 LDAP_LOG( TRANSPORT, DETAIL1,
442 "slap_sasl_match: performing internal search (base=%s, scope=%d)\n",
443 searchbase.bv_val, scope,0 );
445 Debug( LDAP_DEBUG_TRACE,
446 "slap_sasl_match: performing internal search (base=%s, scope=%d)\n",
447 searchbase.bv_val, scope, 0 );
450 be = select_backend( &searchbase, 0, 1 );
451 if(( be == NULL ) || ( be->be_search == NULL)) {
452 rc = LDAP_INAPPROPRIATE_AUTH;
455 suffix_alias( be, &searchbase );
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_threadctx = conn->c_sasl_bindop->o_threadctx;
469 (*be->be_search)( be, conn, &op, /*base=*/NULL, &searchbase,
470 scope, /*deref=*/1, /*sizelimit=*/0, /*time=*/0, filter, /*fstr=*/NULL,
471 /*attrs=*/NULL, /*attrsonly=*/0 );
476 rc = LDAP_INAPPROPRIATE_AUTH;
480 if( searchbase.bv_len ) ch_free( searchbase.bv_val );
481 if( filter ) filter_free( filter );
484 LDAP_LOG( TRANSPORT, ENTRY,
485 "slap_sasl_match: comparison returned %d\n", rc, 0, 0 );
487 Debug( LDAP_DEBUG_TRACE,
488 "<===slap_sasl_match: comparison returned %d\n", rc, 0, 0);
496 * This function answers the question, "Can this ID authorize to that ID?",
497 * based on authorization rules. The rules are stored in the *searchDN, in the
498 * attribute named by *attr. If any of those rules map to the *assertDN, the
499 * authorization is approved.
501 * The DNs should not have the dn: prefix
504 slap_sasl_check_authz( Connection *conn,
505 struct berval *searchDN,
506 struct berval *assertDN,
507 AttributeDescription *ad,
508 struct berval *authc )
514 LDAP_LOG( TRANSPORT, ENTRY,
515 "slap_sasl_check_authz: does %s match %s rule in %s?\n",
516 assertDN->bv_val, ad->ad_cname.bv_val, searchDN->bv_val);
518 Debug( LDAP_DEBUG_TRACE,
519 "==>slap_sasl_check_authz: does %s match %s rule in %s?\n",
520 assertDN->bv_val, ad->ad_cname.bv_val, searchDN->bv_val);
523 rc = backend_attribute( NULL, NULL, conn->c_sasl_bindop, NULL,
524 searchDN, ad, &vals );
525 if( rc != LDAP_SUCCESS ) goto COMPLETE;
527 /* Check if the *assertDN matches any **vals */
528 for( i=0; vals[i].bv_val != NULL; i++ ) {
529 rc = slap_sasl_match( conn, &vals[i], assertDN, authc );
530 if ( rc == LDAP_SUCCESS ) goto COMPLETE;
532 rc = LDAP_INAPPROPRIATE_AUTH;
535 if( vals ) ber_bvarray_free( vals );
538 LDAP_LOG( TRANSPORT, RESULTS,
539 "slap_sasl_check_authz: %s check returning %s\n",
540 ad->ad_cname.bv_val, rc, 0 );
542 Debug( LDAP_DEBUG_TRACE,
543 "<==slap_sasl_check_authz: %s check returning %d\n",
544 ad->ad_cname.bv_val, rc, 0);
551 * Given a SASL name (e.g. "UID=name,cn=REALM,cn=MECH,cn=AUTH")
552 * return the LDAP DN to which it matches. The SASL regexp rules in the config
553 * file turn the SASL name into an LDAP URI. If the URI is just a DN (or a
554 * search with scope=base), just return the URI (or its searchbase). Otherwise
555 * an internal search must be done, and if that search returns exactly one
556 * entry, return the DN of that one entry.
558 void slap_sasl2dn( Connection *conn,
559 struct berval *saslname, struct berval *sasldn )
563 struct berval dn = { 0, NULL };
564 int scope = LDAP_SCOPE_BASE;
565 Filter *filter = NULL;
566 slap_callback cb = { slap_cb_null_response,
567 slap_cb_null_sresult, sasl_sc_sasl2dn, NULL};
569 struct berval regout = { 0, NULL };
572 LDAP_LOG( TRANSPORT, ENTRY,
573 "slap_sasl2dn: converting SASL name %s to DN.\n",
574 saslname->bv_val, 0, 0 );
576 Debug( LDAP_DEBUG_TRACE, "==>slap_sasl2dn: "
577 "converting SASL name %s to a DN\n",
578 saslname->bv_val, 0,0 );
581 sasldn->bv_val = NULL;
583 cb.sc_private = sasldn;
585 /* Convert the SASL name into a minimal URI */
586 if( !slap_sasl_regexp( saslname, ®out ) ) {
590 rc = slap_parseURI( ®out, &dn, &scope, &filter );
591 if( regout.bv_val ) ch_free( regout.bv_val );
592 if( rc != LDAP_SUCCESS ) {
596 /* Must do an internal search */
597 be = select_backend( &dn, 0, 1 );
599 /* Massive shortcut: search scope == base */
600 if( scope == LDAP_SCOPE_BASE ) {
608 LDAP_LOG( TRANSPORT, DETAIL1,
609 "slap_sasl2dn: performing internal search (base=%s, scope=%d)\n",
610 dn.bv_val, scope, 0 );
612 Debug( LDAP_DEBUG_TRACE,
613 "slap_sasl2dn: performing internal search (base=%s, scope=%d)\n",
614 dn.bv_val, scope, 0 );
617 if(( be == NULL ) || ( be->be_search == NULL)) {
620 suffix_alias( be, &dn );
622 op.o_tag = LDAP_REQ_SEARCH;
623 op.o_protocol = LDAP_VERSION3;
624 op.o_ndn = conn->c_ndn;
626 op.o_time = slap_get_time();
627 op.o_do_not_cache = 1;
628 op.o_threadctx = conn->c_sasl_bindop->o_threadctx;
630 (*be->be_search)( be, conn, &op, NULL, &dn,
631 scope, LDAP_DEREF_NEVER, 1, 0,
632 filter, NULL, NULL, 1 );
635 if( sasldn->bv_len ) {
636 conn->c_authz_backend = be;
638 if( dn.bv_len ) ch_free( dn.bv_val );
639 if( filter ) filter_free( filter );
642 LDAP_LOG( TRANSPORT, ENTRY,
643 "slap_sasl2dn: Converted SASL name to %s\n",
644 sasldn->bv_len ? sasldn->bv_val : "<nothing>", 0, 0 );
646 Debug( LDAP_DEBUG_TRACE, "<==slap_sasl2dn: Converted SASL name to %s\n",
647 sasldn->bv_len ? sasldn->bv_val : "<nothing>", 0, 0 );
654 /* Check if a bind can SASL authorize to another identity.
655 * The DNs should not have the dn: prefix
658 int slap_sasl_authorized( Connection *conn,
659 struct berval *authcDN, struct berval *authzDN )
661 int rc = LDAP_INAPPROPRIATE_AUTH;
663 /* User binding as anonymous */
664 if ( authzDN == NULL ) {
670 LDAP_LOG( TRANSPORT, ENTRY,
671 "slap_sasl_authorized: can %s become %s?\n",
672 authcDN->bv_val, authzDN->bv_val, 0 );
674 Debug( LDAP_DEBUG_TRACE,
675 "==>slap_sasl_authorized: can %s become %s?\n",
676 authcDN->bv_val, authzDN->bv_val, 0 );
679 /* If person is authorizing to self, succeed */
680 if ( dn_match( authcDN, authzDN ) ) {
685 /* Allow the manager to authorize as any DN. */
686 if( be_isroot( conn->c_authz_backend, authcDN )) {
691 /* Check source rules */
692 if( authz_policy & SASL_AUTHZ_TO ) {
693 rc = slap_sasl_check_authz( conn, authcDN, authzDN,
694 slap_schema.si_ad_saslAuthzTo, authcDN );
695 if( rc == LDAP_SUCCESS ) {
700 /* Check destination rules */
701 if( authz_policy & SASL_AUTHZ_FROM ) {
702 rc = slap_sasl_check_authz( conn, authzDN, authcDN,
703 slap_schema.si_ad_saslAuthzFrom, authcDN );
704 if( rc == LDAP_SUCCESS ) {
709 rc = LDAP_INAPPROPRIATE_AUTH;
714 LDAP_LOG( TRANSPORT, RESULTS, "slap_sasl_authorized: return %d\n", rc,0,0 );
716 Debug( LDAP_DEBUG_TRACE,
717 "<== slap_sasl_authorized: return %d\n", rc, 0, 0 );