/* acl.c - routines to parse and check acl's */ /* $OpenLDAP$ */ /* * Copyright 1998-2000 The OpenLDAP Foundation, All Rights Reserved. * COPYING RESTRICTIONS APPLY, see COPYRIGHT file */ #include "portable.h" #include #include #include #include #include "slap.h" #include "sets.h" static AccessControl * acl_get( AccessControl *ac, int *count, Backend *be, Operation *op, Entry *e, AttributeDescription *desc, int nmatches, regmatch_t *matches ); static slap_control_t acl_mask( AccessControl *ac, slap_mask_t *mask, Backend *be, Connection *conn, Operation *op, Entry *e, AttributeDescription *desc, struct berval *val, regmatch_t *matches ); #ifdef SLAPD_ACI_ENABLED static int aci_mask( Backend *be, Connection *conn, Operation *op, Entry *e, AttributeDescription *desc, struct berval *val, struct berval *aci, regmatch_t *matches, slap_access_t *grant, slap_access_t *deny ); #endif static int regex_matches( char *pat, char *str, char *buf, regmatch_t *matches); static void string_expand( char *newbuf, int bufsiz, char *pattern, char *match, regmatch_t *matches); char **aci_set_gather (void *cookie, char *name, char *attr); static int aci_match_set ( struct berval *subj, Backend *be, Entry *e, Connection *conn, Operation *op, int setref ); /* * access_allowed - check whether op->o_ndn is allowed the requested access * to entry e, attribute attr, value val. if val is null, access to * the whole attribute is assumed (all values). * * This routine loops through all access controls and calls * acl_mask() on each applicable access control. * The loop exits when a definitive answer is reached or * or no more controls remain. * * returns: * 0 access denied * 1 access granted */ int access_allowed( Backend *be, Connection *conn, Operation *op, Entry *e, AttributeDescription *desc, struct berval *val, slap_access_t access ) { int count; AccessControl *a; #ifdef LDAP_DEBUG char accessmaskbuf[ACCESSMASK_MAXLEN]; #endif slap_mask_t mask; slap_control_t control; const char *attr = desc ? desc->ad_cname->bv_val : NULL; regmatch_t matches[MAXREMATCHES]; #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_ENTRY, "access_allowed: conn %d %s access to \"%s\" \"%s\" requested\n", conn->c_connid, access2str( access ), e->e_dn, attr )); #else Debug( LDAP_DEBUG_ACL, "=> access_allowed: %s access to \"%s\" \"%s\" requested\n", access2str( access ), e->e_dn, attr ); #endif assert( be != NULL ); assert( e != NULL ); assert( attr != NULL ); assert( access > ACL_NONE ); /* grant database root access */ if ( be != NULL && be_isroot( be, op->o_ndn ) ) { #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_INFO, "access_allowed: conn %d root access granted\n", conn->c_connid)); #else Debug( LDAP_DEBUG_ACL, "<= root access granted\n", 0, 0, 0 ); #endif return 1; } /* * no-user-modification operational attributes are ignored * by ACL_WRITE checking as any found here are not provided * by the user */ if ( access >= ACL_WRITE && is_at_no_user_mod( desc->ad_type ) && desc != slap_schema.si_ad_entry && desc != slap_schema.si_ad_children ) { #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_DETAIL1, "access_allowed: conn %d NoUserMod Operational attribute: %s access granted\n", conn->c_connid, attr )); #else Debug( LDAP_DEBUG_ACL, "NoUserMod Operational attribute:" " %s access granted\n", attr, 0, 0 ); #endif return 1; } /* use backend default access if no backend acls */ if( be != NULL && be->be_acl == NULL ) { #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_DETAIL1, "access_allowed: conn %d backend default %s access %s to \"%s\"\n", conn->c_connid, access2str( access ), be->be_dfltaccess >= access ? "granted" : "denied", op->o_dn )); #else Debug( LDAP_DEBUG_ACL, "=> access_allowed: backend default %s access %s to \"%s\"\n", access2str( access ), be->be_dfltaccess >= access ? "granted" : "denied", op->o_dn ); #endif return be->be_dfltaccess >= access; #ifdef notdef /* be is always non-NULL */ /* use global default access if no global acls */ } else if ( be == NULL && global_acl == NULL ) { #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_DETAIL1, "access_allowed: conn %d global default %s access %s to \"%s\"\n", conn->c_connid, access2str( access ), global_default_access >= access ? "granted" : "denied", op->o_dn )); #else Debug( LDAP_DEBUG_ACL, "=> access_allowed: global default %s access %s to \"%s\"\n", access2str( access ), global_default_access >= access ? "granted" : "denied", op->o_dn ); #endif return global_default_access >= access; #endif } ACL_INIT(mask); memset(matches, '\0', sizeof(matches)); control = ACL_BREAK; a = NULL; count = 0; while((a = acl_get( a, &count, be, op, e, desc, MAXREMATCHES, matches )) != NULL) { int i; for (i = 0; i < MAXREMATCHES && matches[i].rm_so > 0; i++) { #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_DETAIL1, "access_allowed: conn %d match[%d]: %d %d ", conn->c_connid, i, (int)matches[i].rm_so, (int)matches[i].rm_eo )); #else Debug( LDAP_DEBUG_ACL, "=> match[%d]: %d %d ", i, (int)matches[i].rm_so, (int)matches[i].rm_eo ); #endif if( matches[i].rm_so <= matches[0].rm_eo ) { int n; for ( n = matches[i].rm_so; n < matches[i].rm_eo; n++) { Debug( LDAP_DEBUG_ACL, "%c", e->e_ndn[n], 0, 0 ); } } #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_ARGS, "\n" )); #else Debug( LDAP_DEBUG_ARGS, "\n", 0, 0, 0 ); #endif } control = acl_mask( a, &mask, be, conn, op, e, desc, val, matches ); if ( control != ACL_BREAK ) { break; } memset(matches, '\0', sizeof(matches)); } if ( ACL_IS_INVALID( mask ) ) { #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_DETAIL1, "access_allowed: conn %d \"%s\" (%s) invalid!\n", conn->c_connid, e->e_dn, attr )); #else Debug( LDAP_DEBUG_ACL, "=> access_allowed: \"%s\" (%s) invalid!\n", e->e_dn, attr, 0 ); #endif ACL_INIT( mask ); } else if ( control == ACL_BREAK ) { #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_DETAIL1, "access_allowed: conn %d no more rules\n", conn->c_connid )); #else Debug( LDAP_DEBUG_ACL, "=> access_allowed: no more rules\n", 0, 0, 0); #endif ACL_INIT( mask ); } #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_ENTRY, "access_allowed: conn %d %s access %s by %s\n", conn->c_connid, access2str( access ), ACL_GRANT( mask, access ) ? "granted" : "denied", accessmask2str( mask, accessmaskbuf ) )); #else Debug( LDAP_DEBUG_ACL, "=> access_allowed: %s access %s by %s\n", access2str( access ), ACL_GRANT(mask, access) ? "granted" : "denied", accessmask2str( mask, accessmaskbuf ) ); #endif return ACL_GRANT(mask, access); } /* * acl_get - return the acl applicable to entry e, attribute * attr. the acl returned is suitable for use in subsequent calls to * acl_access_allowed(). */ static AccessControl * acl_get( AccessControl *a, int *count, Backend *be, Operation *op, Entry *e, AttributeDescription *desc, int nmatch, regmatch_t *matches ) { const char *attr; int dnlen, patlen; assert( e != NULL ); assert( count != NULL ); attr = desc ? desc->ad_cname->bv_val : NULL; if( a == NULL ) { if( be == NULL ) { a = global_acl; } else { a = be->be_acl; } assert( a != NULL ); } else { a = a->acl_next; } dnlen = strlen(e->e_ndn); for ( ; a != NULL; a = a->acl_next ) { (*count) ++; if (a->acl_dn_pat != NULL) { if ( a->acl_dn_style == ACL_STYLE_REGEX ) { #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_DETAIL1, "acl_get: dnpat [%d] %s nsub: %d\n", *count, a->acl_dn_pat, (int) a->acl_dn_re.re_nsub )); #else Debug( LDAP_DEBUG_ACL, "=> dnpat: [%d] %s nsub: %d\n", *count, a->acl_dn_pat, (int) a->acl_dn_re.re_nsub ); #endif if (regexec(&a->acl_dn_re, e->e_ndn, nmatch, matches, 0)) continue; } else { #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_DETAIL1, "acl_get: dn [%d] %s\n", *count, a->acl_dn_pat )); #else Debug( LDAP_DEBUG_ACL, "=> dn: [%d] %s\n", *count, a->acl_dn_pat, 0 ); #endif patlen = strlen( a->acl_dn_pat ); if ( dnlen < patlen ) continue; if ( a->acl_dn_style == ACL_STYLE_BASE ) { /* base dn -- entire object DN must match */ if ( dnlen != patlen ) continue; } else if ( a->acl_dn_style == ACL_STYLE_ONE ) { char *rdn; int rdnlen = -1; if ( dnlen <= patlen ) continue; if ( e->e_ndn[dnlen - patlen - 1] != ',' ) continue; rdn = dn_rdn( NULL, e->e_ndn ); if ( rdn != NULL ) { rdnlen = strlen( rdn ); ch_free( rdn ); } if ( rdnlen != dnlen - patlen - 1 ) continue; } else if ( a->acl_dn_style == ACL_STYLE_SUBTREE ) { if ( dnlen > patlen && e->e_ndn[dnlen - patlen - 1] != ',' ) continue; } else if ( a->acl_dn_style == ACL_STYLE_CHILDREN ) { if ( dnlen <= patlen ) continue; if ( e->e_ndn[dnlen - patlen - 1] != ',' ) continue; } if ( strcmp( a->acl_dn_pat, e->e_ndn + dnlen - patlen ) != 0 ) continue; } #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_DETAIL1, "acl_get: [%d] matched\n", *count )); #else Debug( LDAP_DEBUG_ACL, "=> acl_get: [%d] matched\n", *count, 0, 0 ); #endif } if ( a->acl_filter != NULL ) { ber_int_t rc = test_filter( NULL, NULL, NULL, e, a->acl_filter ); if ( rc != LDAP_COMPARE_TRUE ) { continue; } } #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_DETAIL1, "acl_get: [%d] check attr %s\n", *count, attr )); #else Debug( LDAP_DEBUG_ACL, "=> acl_get: [%d] check attr %s\n", *count, attr, 0); #endif if ( attr == NULL || a->acl_attrs == NULL || ad_inlist( desc, a->acl_attrs ) ) { #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_DETAIL1, "acl_get: [%d] acl %s attr: %s\n", *count, e->e_dn, attr )); #else Debug( LDAP_DEBUG_ACL, "<= acl_get: [%d] acl %s attr: %s\n", *count, e->e_dn, attr ); #endif return a; } matches[0].rm_so = matches[0].rm_eo = -1; } #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_ENTRY, "acl_get: done.\n" )); #else Debug( LDAP_DEBUG_ACL, "<= acl_get: done.\n", 0, 0, 0 ); #endif return( NULL ); } /* * acl_mask - modifies mask based upon the given acl and the * requested access to entry e, attribute attr, value val. if val * is null, access to the whole attribute is assumed (all values). * * returns 0 access NOT allowed * 1 access allowed */ static slap_control_t acl_mask( AccessControl *a, slap_mask_t *mask, Backend *be, Connection *conn, Operation *op, Entry *e, AttributeDescription *desc, struct berval *val, regmatch_t *matches ) { int i, odnlen, patlen; Access *b; #ifdef LDAP_DEBUG char accessmaskbuf[ACCESSMASK_MAXLEN]; #endif const char *attr = desc ? desc->ad_cname->bv_val : NULL; assert( a != NULL ); assert( mask != NULL ); #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_ENTRY, "acl_mask: conn %d access to entry \"%s\", attr \"%s\" requested\n", conn->c_connid, e->e_dn, attr )); LDAP_LOG(( "acl", LDAP_LEVEL_ARGS, " to %s by \"%s\", (%s) \n", val ? "value" : "all values", op->o_ndn ? op->o_ndn : "", accessmask2str( *mask, accessmaskbuf ) )); #else Debug( LDAP_DEBUG_ACL, "=> acl_mask: access to entry \"%s\", attr \"%s\" requested\n", e->e_dn, attr, 0 ); Debug( LDAP_DEBUG_ACL, "=> acl_mask: to %s by \"%s\", (%s) \n", val ? "value" : "all values", op->o_ndn ? op->o_ndn : "", accessmask2str( *mask, accessmaskbuf ) ); #endif for ( i = 1, b = a->acl_access; b != NULL; b = b->a_next, i++ ) { slap_mask_t oldmask, modmask; ACL_INVALIDATE( modmask ); /* AND clauses */ if ( b->a_dn_pat != NULL ) { #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_DETAIL1, "acl_mask: conn %d check a_dn_pat: %s\n", conn->c_connid, b->a_dn_pat )); #else Debug( LDAP_DEBUG_ACL, "<= check a_dn_pat: %s\n", b->a_dn_pat, 0, 0); #endif /* * if access applies to the entry itself, and the * user is bound as somebody in the same namespace as * the entry, OR the given dn matches the dn pattern */ if ( strcmp( b->a_dn_pat, "anonymous" ) == 0 ) { if (op->o_ndn != NULL && op->o_ndn[0] != '\0' ) { continue; } } else if ( strcmp( b->a_dn_pat, "users" ) == 0 ) { if (op->o_ndn == NULL || op->o_ndn[0] == '\0' ) { continue; } } else if ( strcmp( b->a_dn_pat, "self" ) == 0 ) { if( op->o_ndn == NULL || op->o_ndn[0] == '\0' ) { continue; } if ( e->e_dn == NULL || strcmp( e->e_ndn, op->o_ndn ) != 0 ) { continue; } } else if ( b->a_dn_style == ACL_STYLE_REGEX ) { if ( strcmp( b->a_dn_pat, "*" ) != 0 ) { int ret = regex_matches( b->a_dn_pat, op->o_ndn, e->e_ndn, matches ); if( ret == 0 ) { continue; } } } else { if ( e->e_dn == NULL ) continue; patlen = strlen( b->a_dn_pat ); odnlen = strlen( op->o_ndn ); if ( odnlen < patlen ) continue; if ( b->a_dn_style == ACL_STYLE_BASE ) { /* base dn -- entire object DN must match */ if ( odnlen != patlen ) continue; } else if ( b->a_dn_style == ACL_STYLE_ONE ) { char *rdn; int rdnlen = -1; if ( odnlen <= patlen ) continue; if ( op->o_ndn[odnlen - patlen - 1] != ',' ) continue; rdn = dn_rdn( NULL, op->o_ndn ); if ( rdn != NULL ) { rdnlen = strlen( rdn ); ch_free( rdn ); } if ( rdnlen != odnlen - patlen - 1 ) continue; } else if ( b->a_dn_style == ACL_STYLE_SUBTREE ) { if ( odnlen > patlen && op->o_ndn[odnlen - patlen - 1] != ',' ) continue; } else if ( b->a_dn_style == ACL_STYLE_CHILDREN ) { if ( odnlen <= patlen ) continue; if ( op->o_ndn[odnlen - patlen - 1] != ',' ) continue; } if ( strcmp( b->a_dn_pat, op->o_ndn + odnlen - patlen ) != 0 ) continue; } } if ( b->a_sockurl_pat != NULL ) { #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_DETAIL1, "acl_mask: conn %d check a_sockurl_pat: %s\n", conn->c_connid, b->a_sockurl_pat )); #else Debug( LDAP_DEBUG_ACL, "<= check a_sockurl_pat: %s\n", b->a_sockurl_pat, 0, 0 ); #endif if ( strcmp( b->a_sockurl_pat, "*" ) != 0) { if ( b->a_sockurl_style == ACL_STYLE_REGEX) { if (!regex_matches( b->a_sockurl_pat, conn->c_listener_url, e->e_ndn, matches ) ) { continue; } } else { if ( strcasecmp( b->a_sockurl_pat, conn->c_listener_url ) == 0 ) continue; } } } if ( b->a_domain_pat != NULL ) { #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_DETAIL1, "acl_mask: conn %d check a_domain_pat: %s\n", conn->c_connid, b->a_domain_pat )); #else Debug( LDAP_DEBUG_ACL, "<= check a_domain_pat: %s\n", b->a_domain_pat, 0, 0 ); #endif if ( strcmp( b->a_domain_pat, "*" ) != 0) { if ( b->a_domain_style == ACL_STYLE_REGEX) { if (!regex_matches( b->a_domain_pat, conn->c_peer_domain, e->e_ndn, matches ) ) { continue; } } else { if ( strcasecmp( b->a_domain_pat, conn->c_peer_domain ) == 0 ) continue; } } } if ( b->a_peername_pat != NULL ) { #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_DETAIL1, "acl_mask: conn %d check a_perrname_path: %s\n", conn->c_connid, b->a_peername_pat )); #else Debug( LDAP_DEBUG_ACL, "<= check a_peername_path: %s\n", b->a_peername_pat, 0, 0 ); #endif if ( strcmp( b->a_peername_pat, "*" ) != 0) { if ( b->a_peername_style == ACL_STYLE_REGEX) { if (!regex_matches( b->a_peername_pat, conn->c_peer_name, e->e_ndn, matches ) ) { continue; } } else { if ( strcasecmp( b->a_peername_pat, conn->c_peer_name ) == 0 ) continue; } } } if ( b->a_sockname_pat != NULL ) { #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_DETAIL1, "acl_mask: conn %d check a_sockname_path: %s\n", conn->c_connid, b->a_sockname_pat )); #else Debug( LDAP_DEBUG_ACL, "<= check a_sockname_path: %s\n", b->a_sockname_pat, 0, 0 ); #endif if ( strcmp( b->a_sockname_pat, "*" ) != 0) { if ( b->a_sockname_style == ACL_STYLE_REGEX) { if (!regex_matches( b->a_sockname_pat, conn->c_sock_name, e->e_ndn, matches ) ) { continue; } } else { if ( strcasecmp( b->a_sockname_pat, conn->c_sock_name ) == 0 ) continue; } } } if ( b->a_dn_at != NULL && op->o_ndn != NULL ) { Attribute *at; struct berval bv; int rc, match = 0; const char *text; const char *desc = b->a_dn_at->ad_cname->bv_val; #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_DETAIL1, "acl_mask: conn %d check a_dn_pat: %s\n", conn->c_connid, desc )); #else Debug( LDAP_DEBUG_ACL, "<= check a_dn_at: %s\n", desc, 0, 0); #endif bv.bv_val = op->o_ndn; bv.bv_len = strlen( bv.bv_val ); /* see if asker is listed in dnattr */ for( at = attrs_find( e->e_attrs, b->a_dn_at ); at != NULL; at = attrs_find( at->a_next, b->a_dn_at ) ) { if( value_find( b->a_dn_at, at->a_vals, &bv ) == 0 ) { /* found it */ match = 1; break; } } if( match ) { /* have a dnattr match. if this is a self clause then * the target must also match the op dn. */ if ( b->a_dn_self ) { /* check if the target is an attribute. */ if ( val == NULL ) continue; /* target is attribute, check if the attribute value * is the op dn. */ rc = value_match( &match, b->a_dn_at, b->a_dn_at->ad_type->sat_equality, 0, val, &bv, &text ); /* on match error or no match, fail the ACL clause */ if (rc != LDAP_SUCCESS || match != 0 ) continue; } } else { /* no dnattr match, check if this is a self clause */ if ( ! b->a_dn_self ) continue; /* this is a self clause, check if the target is an * attribute. */ if ( val == NULL ) continue; /* target is attribute, check if the attribute value * is the op dn. */ rc = value_match( &match, b->a_dn_at, b->a_dn_at->ad_type->sat_equality, 0, val, &bv, &text ); /* on match error or no match, fail the ACL clause */ if (rc != LDAP_SUCCESS || match != 0 ) continue; } } if ( b->a_group_pat != NULL && op->o_ndn != NULL ) { char buf[1024]; /* b->a_group is an unexpanded entry name, expanded it should be an * entry with objectclass group* and we test to see if odn is one of * the values in the attribute group */ /* see if asker is listed in dnattr */ if ( b->a_group_style == ACL_STYLE_REGEX ) { string_expand(buf, sizeof(buf), b->a_group_pat, e->e_ndn, matches); if ( dn_normalize(buf) == NULL ) { /* did not expand to a valid dn */ continue; } } else { strncpy( buf, b->a_group_pat, sizeof(buf) - 1 ); buf[sizeof(buf) - 1] = 0; } if (backend_group(be, conn, op, e, buf, op->o_ndn, b->a_group_oc, b->a_group_at) != 0) { continue; } } if ( b->a_set_pat != NULL ) { struct berval bv; bv.bv_val = b->a_set_pat; bv.bv_len = strlen(b->a_set_pat); if (aci_match_set( &bv, be, e, conn, op, 0 ) == 0) { continue; } } if ( b->a_authz.sai_ssf ) { #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_DETAIL1, "acl_mask: conn %d check a_authz.sai_ssf: ACL %u > OP %u\n", conn->c_connid, b->a_authz.sai_ssf, op->o_ssf )); #else Debug( LDAP_DEBUG_ACL, "<= check a_authz.sai_ssf: ACL %u > OP %u\n", b->a_authz.sai_ssf, op->o_ssf, 0 ); #endif if ( b->a_authz.sai_ssf > op->o_ssf ) { continue; } } if ( b->a_authz.sai_transport_ssf ) { #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_DETAIL1, "acl_mask: conn %d check a_authz.sai_transport_ssf: ACL %u > OP %u\n", conn->c_connid, b->a_authz.sai_transport_ssf, op->o_transport_ssf )); #else Debug( LDAP_DEBUG_ACL, "<= check a_authz.sai_transport_ssf: ACL %u > OP %u\n", b->a_authz.sai_transport_ssf, op->o_transport_ssf, 0 ); #endif if ( b->a_authz.sai_transport_ssf > op->o_transport_ssf ) { continue; } } if ( b->a_authz.sai_tls_ssf ) { #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_DETAIL1, "acl_mask: conn %d check a_authz.sai_tls_ssf: ACL %u > OP %u\n", conn->c_connid, b->a_authz.sai_tls_ssf, op->o_tls_ssf )); #else Debug( LDAP_DEBUG_ACL, "<= check a_authz.sai_tls_ssf: ACL %u > OP %u\n", b->a_authz.sai_tls_ssf, op->o_tls_ssf, 0 ); #endif if ( b->a_authz.sai_tls_ssf > op->o_tls_ssf ) { continue; } } if ( b->a_authz.sai_sasl_ssf ) { #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_DETAIL1, "acl_mask: conn %d check a_authz.sai_sasl_ssf: ACL %u > OP %u\n", conn->c_connid, b->a_authz.sai_sasl_ssf, op->o_sasl_ssf )); #else Debug( LDAP_DEBUG_ACL, "<= check a_authz.sai_sasl_ssf: ACL %u > OP %u\n", b->a_authz.sai_sasl_ssf, op->o_sasl_ssf, 0 ); #endif if ( b->a_authz.sai_sasl_ssf > op->o_sasl_ssf ) { continue; } } #ifdef SLAPD_ACI_ENABLED if ( b->a_aci_at != NULL ) { Attribute *at; slap_access_t grant, deny, tgrant, tdeny; /* this case works different from the others above. * since aci's themselves give permissions, we need * to first check b->a_access_mask, the ACL's access level. */ if( op->o_ndn == NULL || op->o_ndn[0] == '\0' ) { continue; } if ( e->e_dn == NULL ) { continue; } /* first check if the right being requested * is allowed by the ACL clause. */ if ( ! ACL_GRANT( b->a_access_mask, *mask ) ) { continue; } /* get the aci attribute */ at = attr_find( e->e_attrs, b->a_aci_at ); if ( at == NULL ) { continue; } /* start out with nothing granted, nothing denied */ ACL_INIT(tgrant); ACL_INIT(tdeny); /* the aci is an multi-valued attribute. The * rights are determined by OR'ing the individual * rights given by the acis. */ for ( i = 0; at->a_vals[i] != NULL; i++ ) { if (aci_mask( be, conn, op, e, desc, val, at->a_vals[i], matches, &grant, &deny ) != 0) { tgrant |= grant; tdeny |= deny; } } /* remove anything that the ACL clause does not allow */ tgrant &= b->a_access_mask & ACL_PRIV_MASK; tdeny &= ACL_PRIV_MASK; /* see if we have anything to contribute */ if( ACL_IS_INVALID(tgrant) && ACL_IS_INVALID(tdeny) ) { continue; } /* this could be improved by changing acl_mask so that it can deal with * by clauses that return grant/deny pairs. Right now, it does either * additive or subtractive rights, but not both at the same time. So, * we need to combine the grant/deny pair into a single rights mask in * a smart way: if either grant or deny is "empty", then we use the * opposite as is, otherwise we remove any denied rights from the grant * rights mask and construct an additive mask. */ if (ACL_IS_INVALID(tdeny)) { modmask = tgrant | ACL_PRIV_ADDITIVE; } else if (ACL_IS_INVALID(tgrant)) { modmask = tdeny | ACL_PRIV_SUBSTRACTIVE; } else { modmask = (tgrant & ~tdeny) | ACL_PRIV_ADDITIVE; } } else #endif { modmask = b->a_access_mask; } #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_RESULTS, "acl_mask: conn %d [%d] applying %s (%s)\n", conn->c_connid, i, accessmask2str( modmask, accessmaskbuf), b->a_type == ACL_CONTINUE ? "continue" : b->a_type == ACL_BREAK ? "break" : "stop" )); #else Debug( LDAP_DEBUG_ACL, "<= acl_mask: [%d] applying %s (%s)\n", i, accessmask2str( modmask, accessmaskbuf ), b->a_type == ACL_CONTINUE ? "continue" : b->a_type == ACL_BREAK ? "break" : "stop" ); #endif /* save old mask */ oldmask = *mask; if( ACL_IS_ADDITIVE(modmask) ) { /* add privs */ ACL_PRIV_SET( *mask, modmask ); /* cleanup */ ACL_PRIV_CLR( *mask, ~ACL_PRIV_MASK ); } else if( ACL_IS_SUBTRACTIVE(modmask) ) { /* substract privs */ ACL_PRIV_CLR( *mask, modmask ); /* cleanup */ ACL_PRIV_CLR( *mask, ~ACL_PRIV_MASK ); } else { /* assign privs */ *mask = modmask; } #ifdef NEW_LOGGING LDAP_LOG(( "aci", LDAP_LEVEL_DETAIL1, "acl_mask: conn %d [%d] mask: %s\n", conn->c_connid, i, accessmask2str( *mask, accessmaskbuf) )); #else Debug( LDAP_DEBUG_ACL, "<= acl_mask: [%d] mask: %s\n", i, accessmask2str(*mask, accessmaskbuf), 0 ); #endif if( b->a_type == ACL_CONTINUE ) { continue; } else if ( b->a_type == ACL_BREAK ) { return ACL_BREAK; } else { return ACL_STOP; } } /* implicit "by * none" clause */ ACL_INIT(*mask); #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_RESULTS, "acl_mask: conn %d no more clauses, returning %d (stop)\n", conn->c_connid, accessmask2str( *mask, accessmaskbuf) )); #else Debug( LDAP_DEBUG_ACL, "<= acl_mask: no more clauses, returning %s (stop)\n", accessmask2str(*mask, accessmaskbuf), 0, 0 ); #endif return ACL_STOP; } /* * acl_check_modlist - check access control on the given entry to see if * it allows the given modifications by the user associated with op. * returns 1 if mods allowed ok * 0 mods not allowed */ int acl_check_modlist( Backend *be, Connection *conn, Operation *op, Entry *e, Modifications *mlist ) { int i; assert( be != NULL ); /* short circuit root database access */ if ( be_isroot( be, op->o_ndn ) ) { #ifdef NEW_LOGGING LDAP_LOG(( "acl", LDAP_LEVEL_DETAIL1, "acl_check_modlist: conn %d access granted to root user\n", conn->c_connid )); #else Debug( LDAP_DEBUG_ACL, "<= acl_access_allowed: granted to database root\n", 0, 0, 0 ); #endif return 1; } /* use backend default access if no backend acls */ if( be != NULL && be->be_acl == NULL ) { #ifdef NEW_LOGGING LDAP_LOG(( "aci", LDAP_LEVEL_DETAIL1, "acl_check_modlist: conn %d backend default %s access %s to \"%s\"\n", conn->c_connid, access2str( ACL_WRITE ), be->be_dfltaccess >= ACL_WRITE ? "granted" : "denied", op->o_dn )); #else Debug( LDAP_DEBUG_ACL, "=> access_allowed: backend default %s access %s to \"%s\"\n", access2str( ACL_WRITE ), be->be_dfltaccess >= ACL_WRITE ? "granted" : "denied", op->o_dn ); #endif return be->be_dfltaccess >= ACL_WRITE; #ifdef notdef /* be is always non-NULL */ /* use global default access if no global acls */ } else if ( be == NULL && global_acl == NULL ) { #ifdef NEW_LOGGING LDAP_LOG(( "aci", LDAP_LEVEL_DETAIL1, "acl_check_modlist: conn %d global default %s access %s to \"%s\"\n", conn->c_connid, access2str( ACL_WRITE ), global_default_access >= ACL_WRITE ? "granted" : "denied", op->o_dn )); #else Debug( LDAP_DEBUG_ACL, "=> access_allowed: global default %s access %s to \"%s\"\n", access2str( ACL_WRITE ), global_default_access >= ACL_WRITE ? "granted" : "denied", op->o_dn ); #endif return global_default_access >= ACL_WRITE; #endif } for ( ; mlist != NULL; mlist = mlist->sml_next ) { /* * no-user-modification operational attributes are ignored * by ACL_WRITE checking as any found here are not provided * by the user */ if ( is_at_no_user_mod( mlist->sml_desc->ad_type ) ) { #ifdef NEW_LOGGING LDAP_LOG(( "aci", LDAP_LEVEL_DETAIL1, "acl_check_modlist: conn %d no-user-mod %s: modify access granted\n", conn->c_connid, mlist->sml_desc->ad_cname->bv_val )); #else Debug( LDAP_DEBUG_ACL, "acl: no-user-mod %s:" " modify access granted\n", mlist->sml_desc->ad_cname->bv_val, 0, 0 ); #endif continue; } switch ( mlist->sml_op ) { case LDAP_MOD_REPLACE: case LDAP_MOD_ADD: if ( mlist->sml_bvalues == NULL ) { break; } for ( i = 0; mlist->sml_bvalues[i] != NULL; i++ ) { if ( ! access_allowed( be, conn, op, e, mlist->sml_desc, mlist->sml_bvalues[i], ACL_WRITE ) ) { return( 0 ); } } break; case LDAP_MOD_DELETE: if ( mlist->sml_bvalues == NULL ) { if ( ! access_allowed( be, conn, op, e, mlist->sml_desc, NULL, ACL_WRITE ) ) { return( 0 ); } break; } for ( i = 0; mlist->sml_bvalues[i] != NULL; i++ ) { if ( ! access_allowed( be, conn, op, e, mlist->sml_desc, mlist->sml_bvalues[i], ACL_WRITE ) ) { return( 0 ); } } break; } } return( 1 ); } static char * aci_bvstrdup( struct berval *bv ) { char *s; s = (char *)ch_malloc(bv->bv_len + 1); if (s != NULL) { AC_MEMCPY(s, bv->bv_val, bv->bv_len); s[bv->bv_len] = 0; } return(s); } static int aci_strbvcmp( const char *s, struct berval *bv ) { int res, len; res = strncasecmp( s, bv->bv_val, bv->bv_len ); if (res) return(res); len = strlen(s); if (len > (int)bv->bv_len) return(1); if (len < (int)bv->bv_len) return(-1); return(0); } static int aci_get_part( struct berval *list, int ix, char sep, struct berval *bv ) { int len; char *p; if (bv) { bv->bv_len = 0; bv->bv_val = NULL; } len = list->bv_len; p = list->bv_val; while (len >= 0 && --ix >= 0) { while (--len >= 0 && *p++ != sep) ; } while (len >= 0 && *p == ' ') { len--; p++; } if (len < 0) return(-1); if (!bv) return(0); bv->bv_val = p; while (--len >= 0 && *p != sep) { bv->bv_len++; p++; } while (bv->bv_len > 0 && *--p == ' ') bv->bv_len--; return(bv->bv_len); } char ** aci_set_gather (void *cookie, char *name, char *attr) { struct { Backend *be; Entry *e; Connection *conn; Operation *op; } *cp = (void *)cookie; struct berval **bvals = NULL; char **vals = NULL; char *ndn; int i; /* this routine needs to return the bervals instead of * plain strings, since syntax is not known. It should * also return the syntax or some "comparison cookie". */ if ((ndn = ch_strdup(name)) != NULL) { if (dn_normalize(ndn) != NULL) { const char *text; AttributeDescription *desc = NULL; if (slap_str2ad(attr, &desc, &text) == LDAP_SUCCESS) { backend_attribute(cp->be, NULL /*cp->conn*/, NULL /*cp->op*/, cp->e, ndn, desc, &bvals); if (bvals != NULL) { for (i = 0; bvals[i] != NULL; i++) { } vals = ch_calloc(i + 1, sizeof(char *)); if (vals != NULL) { while (--i >= 0) { vals[i] = bvals[i]->bv_val; bvals[i]->bv_val = NULL; } } ber_bvecfree(bvals); } ad_free(desc, 1); } } ch_free(ndn); } return(vals); } static int aci_match_set ( struct berval *subj, Backend *be, Entry *e, Connection *conn, Operation *op, int setref ) { char *set = NULL; int rc = 0; struct { Backend *be; Entry *e; Connection *conn; Operation *op; } cookie; if (setref == 0) { set = aci_bvstrdup(subj); } else { struct berval bv; char *subjdn; char *setat; struct berval **bvals; const char *text; AttributeDescription *desc = NULL; /* format of string is "entry/setAttrName" */ if (aci_get_part(subj, 0, '/', &bv) < 0) { return(0); } subjdn = aci_bvstrdup(&bv); if ( subjdn == NULL ) { return(0); } if ( aci_get_part(subj, 1, '/', &bv) < 0 ) { setat = ch_strdup( SLAPD_ACI_SET_ATTR ); } else { setat = aci_bvstrdup(&bv); } if ( setat != NULL ) { if ( dn_normalize(subjdn) != NULL && slap_str2ad(setat, &desc, &text) == LDAP_SUCCESS ) { backend_attribute(be, NULL, NULL, e, subjdn, desc, &bvals); ad_free(desc, 1); if ( bvals != NULL ) { if ( bvals[0] != NULL ) set = ch_strdup(bvals[0]->bv_val); ber_bvecfree(bvals); } } ch_free(setat); } ch_free(subjdn); } if (set != NULL) { cookie.be = be; cookie.e = e; cookie.conn = conn; cookie.op = op; rc = (set_filter(aci_set_gather, &cookie, set, op->o_ndn, e->e_ndn, NULL) > 0); ch_free(set); } return(rc); } #ifdef SLAPD_ACI_ENABLED static int aci_list_map_rights( struct berval *list ) { struct berval bv; slap_access_t mask; int i; ACL_INIT(mask); for (i = 0; aci_get_part(list, i, ',', &bv) >= 0; i++) { if (bv.bv_len <= 0) continue; switch (*bv.bv_val) { case 'c': ACL_PRIV_SET(mask, ACL_PRIV_COMPARE); break; case 's': /* **** NOTE: draft-ietf-ldapext-aci-model-0.3.txt defines * the right 's' to mean "set", but in the examples states * that the right 's' means "search". The latter definition * is used here. */ ACL_PRIV_SET(mask, ACL_PRIV_SEARCH); break; case 'r': ACL_PRIV_SET(mask, ACL_PRIV_READ); break; case 'w': ACL_PRIV_SET(mask, ACL_PRIV_WRITE); break; case 'x': /* **** NOTE: draft-ietf-ldapext-aci-model-0.3.txt does not * define any equivalent to the AUTH right, so I've just used * 'x' for now. */ ACL_PRIV_SET(mask, ACL_PRIV_AUTH); break; default: break; } } return(mask); } static int aci_list_has_attr( struct berval *list, const char *attr, struct berval *val ) { struct berval bv, left, right; int i; for (i = 0; aci_get_part(list, i, ',', &bv) >= 0; i++) { if (aci_get_part(&bv, 0, '=', &left) < 0 || aci_get_part(&bv, 1, '=', &right) < 0) { if (aci_strbvcmp(attr, &bv) == 0) return(1); } else if (val == NULL) { if (aci_strbvcmp(attr, &left) == 0) return(1); } else { if (aci_strbvcmp(attr, &left) == 0) { /* this is experimental code that implements a * simple (prefix) match of the attribute value. * the ACI draft does not provide for aci's that * apply to specific values, but it would be * nice to have. If the part of an aci's * rights list is of the form =, * that means the aci applies only to attrs with * the given value. Furthermore, if the attr is * of the form =*, then is * treated as a prefix, and the aci applies to * any value with that prefix. * * Ideally, this would allow r.e. matches. */ if (aci_get_part(&right, 0, '*', &left) < 0 || right.bv_len <= left.bv_len) { if (aci_strbvcmp(val->bv_val, &right) == 0) return(1); } else if (val->bv_len >= left.bv_len) { if (strncasecmp( val->bv_val, left.bv_val, left.bv_len ) == 0) return(1); } } } } return(0); } static slap_access_t aci_list_get_attr_rights( struct berval *list, const char *attr, struct berval *val ) { struct berval bv; slap_access_t mask; int i; /* loop through each rights/attr pair, skip first part (action) */ ACL_INIT(mask); for (i = 1; aci_get_part(list, i + 1, ';', &bv) >= 0; i += 2) { if (aci_list_has_attr(&bv, attr, val) == 0) continue; if (aci_get_part(list, i, ';', &bv) < 0) continue; mask |= aci_list_map_rights(&bv); } return(mask); } static int aci_list_get_rights( struct berval *list, const char *attr, struct berval *val, slap_access_t *grant, slap_access_t *deny ) { struct berval perm, actn; slap_access_t *mask; int i, found; if (attr == NULL || *attr == 0 || strcasecmp(attr, "entry") == 0) { attr = "[entry]"; } found = 0; ACL_INIT(*grant); ACL_INIT(*deny); /* loop through each permissions clause */ for (i = 0; aci_get_part(list, i, '$', &perm) >= 0; i++) { if (aci_get_part(&perm, 0, ';', &actn) < 0) continue; if (aci_strbvcmp( "grant", &actn ) == 0) { mask = grant; } else if (aci_strbvcmp( "deny", &actn ) == 0) { mask = deny; } else { continue; } found = 1; *mask |= aci_list_get_attr_rights(&perm, attr, val); *mask |= aci_list_get_attr_rights(&perm, "[all]", NULL); } return(found); } static int aci_group_member ( struct berval *subj, const char *defgrpoc, const char *defgrpat, Backend *be, Entry *e, Connection *conn, Operation *op, regmatch_t *matches ) { struct berval bv; char *subjdn, *grpdn = NULL; char *grpoc; char *grpat; ObjectClass *grp_oc = NULL; AttributeDescription *grp_ad = NULL; char *text; int rc; /* format of string is "group/objectClassValue/groupAttrName" */ if (aci_get_part(subj, 0, '/', &bv) < 0) { return(0); } subjdn = aci_bvstrdup(&bv); if (subjdn == NULL) { return(0); } if (aci_get_part(subj, 1, '/', &bv) < 0) { grpoc = ch_strdup( defgrpoc ); } else { grpoc = aci_bvstrdup(&bv); } if (aci_get_part(subj, 2, '/', &bv) < 0) { grpat = ch_strdup( defgrpat ); } else { grpat = aci_bvstrdup(&bv); } rc = slap_str2ad( grpat, &grp_ad, &text ); if( rc != LDAP_SUCCESS ) { rc = 0; goto done; } rc = 0; grp_oc = oc_find( grpoc ); grpdn = (char *)ch_malloc(1024); if (grp_oc != NULL && grp_ad != NULL && grpdn != NULL) { string_expand(grpdn, 1024, subjdn, e->e_ndn, matches); if ( dn_normalize(grpdn) != NULL ) { rc = (backend_group(be, conn, op, e, grpdn, op->o_ndn, grp_oc, grp_ad) == 0); } } done: if( grp_ad != NULL ) ad_free( grp_ad, 1 ); ch_free(grpdn); ch_free(grpat); ch_free(grpoc); ch_free(subjdn); return(rc); } static int aci_mask( Backend *be, Connection *conn, Operation *op, Entry *e, AttributeDescription *desc, struct berval *val, struct berval *aci, regmatch_t *matches, slap_access_t *grant, slap_access_t *deny ) { struct berval bv, perms, sdn; char *subjdn; int rc; char *attr = desc->ad_cname->bv_val; /* parse an aci of the form: oid#scope#action;rights;attr;rights;attr$action;rights;attr;rights;attr#dnType#subjectDN See draft-ietf-ldapext-aci-model-04.txt section 9.1 for a full description of the format for this attribute. For now, this routine only supports scope=entry. */ /* check that the aci has all 5 components */ if (aci_get_part(aci, 4, '#', NULL) < 0) return(0); /* check that the aci family is supported */ if (aci_get_part(aci, 0, '#', &bv) < 0) return(0); /* check that the scope is "entry" */ if (aci_get_part(aci, 1, '#', &bv) < 0 || aci_strbvcmp( "entry", &bv ) != 0) { return(0); } /* get the list of permissions clauses, bail if empty */ if (aci_get_part(aci, 2, '#', &perms) <= 0) return(0); /* check if any permissions allow desired access */ if (aci_list_get_rights(&perms, attr, val, grant, deny) == 0) return(0); /* see if we have a DN match */ if (aci_get_part(aci, 3, '#', &bv) < 0) return(0); if (aci_get_part(aci, 4, '#', &sdn) < 0) return(0); if (aci_strbvcmp( "access-id", &bv ) == 0) { subjdn = aci_bvstrdup(&sdn); if (subjdn == NULL) return(0); rc = 1; if ( dn_normalize(subjdn) != NULL ) if (strcasecmp(op->o_ndn, subjdn) != 0) rc = 0; ch_free(subjdn); return(rc); } if (aci_strbvcmp( "self", &bv ) == 0) { if (strcasecmp(op->o_ndn, e->e_ndn) == 0) return(1); } else if (aci_strbvcmp( "dnattr", &bv ) == 0) { char *dnattr = aci_bvstrdup(&sdn); Attribute *at; AttributeDescription *ad = NULL; const char *text; rc = slap_str2ad( dnattr, &ad, &text ); ch_free( dnattr ); if( rc != LDAP_SUCCESS ) { return 0; } rc = 0; bv.bv_val = op->o_ndn; bv.bv_len = strlen( bv.bv_val ); for(at = attrs_find( e->e_attrs, ad ); at != NULL; at = attrs_find( at->a_next, ad ) ) { if (value_find( ad, at->a_vals, &bv) == 0 ) { rc = 1; break; } } ad_free( ad, 1 ); return rc; } else if (aci_strbvcmp( "group", &bv ) == 0) { if (aci_group_member(&sdn, SLAPD_GROUP_CLASS, SLAPD_GROUP_ATTR, be, e, conn, op, matches)) return(1); } else if (aci_strbvcmp( "role", &bv ) == 0) { if (aci_group_member(&sdn, SLAPD_ROLE_CLASS, SLAPD_ROLE_ATTR, be, e, conn, op, matches)) return(1); } else if (aci_strbvcmp( "set", &bv ) == 0) { if (aci_match_set(&sdn, be, e, conn, op, 0)) return(1); } else if (aci_strbvcmp( "set-ref", &bv ) == 0) { if (aci_match_set(&sdn, be, e, conn, op, 1)) return(1); } return(0); } #endif /* SLAPD_ACI_ENABLED */ static void string_expand( char *newbuf, int bufsiz, char *pat, char *match, regmatch_t *matches) { int size; char *sp; char *dp; int flag; size = 0; newbuf[0] = '\0'; bufsiz--; /* leave space for lone $ */ flag = 0; for ( dp = newbuf, sp = pat; size < bufsiz && *sp ; sp++) { /* did we previously see a $ */ if (flag) { if (*sp == '$') { *dp++ = '$'; size++; } else if (*sp >= '0' && *sp <= '9' ) { int n; int i; int l; n = *sp - '0'; *dp = '\0'; i = matches[n].rm_so; l = matches[n].rm_eo; for ( ; size < 512 && i < l; size++, i++ ) { *dp++ = match[i]; size++; } *dp = '\0'; } flag = 0; } else { if (*sp == '$') { flag = 1; } else { *dp++ = *sp; size++; } } } if (flag) { /* must have ended with a single $ */ *dp++ = '$'; size++; } *dp = '\0'; #ifdef NEW_LOGGING LDAP_LOG(( "aci", LDAP_LEVEL_DETAIL1, "string_expand: pattern = %s\n", pat )); LDAP_LOG(( "aci", LDAP_LEVEL_DETAIL1, "string_expand: expanded = %s\n", newbuf )); #else Debug( LDAP_DEBUG_TRACE, "=> string_expand: pattern: %s\n", pat, 0, 0 ); Debug( LDAP_DEBUG_TRACE, "=> string_expand: expanded: %s\n", newbuf, 0, 0 ); #endif } static int regex_matches( char *pat, /* pattern to expand and match against */ char *str, /* string to match against pattern */ char *buf, /* buffer with $N expansion variables */ regmatch_t *matches /* offsets in buffer for $N expansion variables */ ) { regex_t re; char newbuf[512]; int rc; if(str == NULL) str = ""; string_expand(newbuf, sizeof(newbuf), pat, buf, matches); if (( rc = regcomp(&re, newbuf, REG_EXTENDED|REG_ICASE))) { char error[512]; regerror(rc, &re, error, sizeof(error)); #ifdef NEW_LOGGING LDAP_LOG(( "aci", LDAP_LEVEL_ERR, "regex_matches: compile( \"%s\", \"%s\") failed %s\n", pat, str, error )); #else Debug( LDAP_DEBUG_TRACE, "compile( \"%s\", \"%s\") failed %s\n", pat, str, error ); #endif return( 0 ); } rc = regexec(&re, str, 0, NULL, 0); regfree( &re ); #ifdef NEW_LOGGING LDAP_LOG(( "aci", LDAP_LEVEL_DETAIL2, "regex_matches: string: %s\n", str )); LDAP_LOG(( "aci", LDAP_LEVEL_DETAIL2, "regex_matches: rc: %d %s\n", rc, rc ? "matches" : "no matches" )); #else Debug( LDAP_DEBUG_TRACE, "=> regex_matches: string: %s\n", str, 0, 0 ); Debug( LDAP_DEBUG_TRACE, "=> regex_matches: rc: %d %s\n", rc, !rc ? "matches" : "no matches", 0 ); #endif return( !rc ); }