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https://git.openldap.org/openldap/openldap.git
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1149 lines
26 KiB
C
1149 lines
26 KiB
C
/* acl.c - routines to parse and check acl's */
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/* $OpenLDAP$ */
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/*
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* Copyright 1998-1999 The OpenLDAP Foundation, All Rights Reserved.
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* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
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*/
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#include "portable.h"
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#include <stdio.h>
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#include <ac/regex.h>
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#include <ac/socket.h>
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#include <ac/string.h>
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#include "slap.h"
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static AccessControl * acl_get(
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AccessControl *ac, int *count,
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Backend *be, Operation *op,
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Entry *e, char *attr,
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int nmatches, regmatch_t *matches );
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static slap_control_t acl_mask(
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AccessControl *ac, slap_access_mask_t *mask,
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Backend *be, Connection *conn, Operation *op,
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Entry *e, char *attr, struct berval *val,
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regmatch_t *matches );
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#ifdef SLAPD_ACI_ENABLED
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static int aci_mask(
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Backend *be,
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Operation *op,
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Entry *e, char *attr, struct berval *val, struct berval *aci,
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regmatch_t *matches, slap_access_t *grant, slap_access_t *deny );
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char *supportedACIMechs[] = {
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"1.3.6.1.4.1.4203.666.7.1", /* experimental draft aci family */
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"1.3.6.1.4.1.4203.666.7.2", /* experimental OpenLDAP aci family */
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NULL
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};
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#endif
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static int regex_matches(char *pat, char *str, char *buf, regmatch_t *matches);
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static void string_expand(char *newbuf, int bufsiz, char *pattern,
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char *match, regmatch_t *matches);
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/*
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* access_allowed - check whether op->o_ndn is allowed the requested access
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* to entry e, attribute attr, value val. if val is null, access to
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* the whole attribute is assumed (all values).
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*
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* This routine loops through all access controls and calls
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* acl_mask() on each applicable access control.
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* The loop exits when a definitive answer is reached or
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* or no more controls remain.
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*
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* returns:
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* 0 access denied
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* 1 access granted
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*/
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int
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access_allowed(
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Backend *be,
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Connection *conn,
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Operation *op,
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Entry *e,
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char *attr,
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struct berval *val,
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slap_access_t access
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)
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{
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int count;
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AccessControl *a;
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char accessmaskbuf[ACCESSMASK_MAXLEN];
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slap_access_mask_t mask;
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slap_control_t control;
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regmatch_t matches[MAXREMATCHES];
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Debug( LDAP_DEBUG_ACL,
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"=> access_allowed: %s access to \"%s\" \"%s\" requested\n",
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access2str( access ),
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e->e_dn, attr );
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assert( be != NULL );
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assert( e != NULL );
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assert( attr != NULL );
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assert( access > ACL_NONE );
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/* grant database root access */
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if ( be != NULL && be_isroot( be, op->o_ndn ) ) {
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Debug( LDAP_DEBUG_ACL,
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"<= root access granted\n",
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0, 0, 0 );
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return 1;
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}
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/* no user modify operational attributes are ignored by ACL checking */
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if ( oc_check_no_usermod_attr( attr ) ) {
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Debug( LDAP_DEBUG_ACL, "NoUserMod Operational attribute:"
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" %s access granted\n",
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attr, 0, 0 );
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return 1;
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}
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/* use backend default access if no backend acls */
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if( be != NULL && be->be_acl == NULL ) {
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Debug( LDAP_DEBUG_ACL,
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"=> access_allowed: backend default %s access %s to \"%s\"\n",
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access2str( access ),
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be->be_dfltaccess >= access ? "granted" : "denied", op->o_dn );
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return be->be_dfltaccess >= access;
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#ifdef notdef
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/* be is always non-NULL */
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/* use global default access if no global acls */
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} else if ( be == NULL && global_acl == NULL ) {
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Debug( LDAP_DEBUG_ACL,
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"=> access_allowed: global default %s access %s to \"%s\"\n",
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access2str( access ),
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global_default_access >= access ? "granted" : "denied", op->o_dn );
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return global_default_access >= access;
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#endif
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}
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ACL_INIT(mask);
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memset(matches, 0, sizeof(matches));
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control = ACL_BREAK;
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a = NULL;
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count = 0;
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while( a = acl_get( a, &count, be, op, e, attr, MAXREMATCHES, matches ) )
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{
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int i;
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for (i = 0; i < MAXREMATCHES && matches[i].rm_so > 0; i++) {
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Debug( LDAP_DEBUG_ACL, "=> match[%d]: %d %d ", i,
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(int)matches[i].rm_so, (int)matches[i].rm_eo );
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if( matches[i].rm_so <= matches[0].rm_eo ) {
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int n;
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for ( n = matches[i].rm_so; n < matches[i].rm_eo; n++) {
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Debug( LDAP_DEBUG_ACL, "%c", e->e_ndn[n], 0, 0 );
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}
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}
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Debug( LDAP_DEBUG_ARGS, "\n", 0, 0, 0 );
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}
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control = acl_mask( a, &mask, be, conn, op,
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e, attr, val, matches );
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if ( control != ACL_BREAK ) {
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break;
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}
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memset(matches, 0, sizeof(matches));
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}
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if ( ACL_IS_INVALID( mask ) ) {
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Debug( LDAP_DEBUG_ACL,
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"=> access_allowed: \"%s\" (%s) invalid!\n",
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e->e_dn, attr, 0 );
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ACL_INIT( mask );
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} else if ( control == ACL_BREAK ) {
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Debug( LDAP_DEBUG_ACL,
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"=> access_allowed: no more rules\n", 0, 0, 0);
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ACL_INIT( mask );
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}
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Debug( LDAP_DEBUG_ACL,
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"=> access_allowed: %s access %s by %s\n",
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access2str( access ),
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ACL_GRANT(mask, access) ? "granted" : "denied",
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accessmask2str( mask, accessmaskbuf ) );
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return ACL_GRANT(mask, access);
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}
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/*
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* acl_get - return the acl applicable to entry e, attribute
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* attr. the acl returned is suitable for use in subsequent calls to
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* acl_access_allowed().
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*/
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static AccessControl *
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acl_get(
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AccessControl *a,
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int *count,
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Backend *be,
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Operation *op,
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Entry *e,
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char *attr,
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int nmatch,
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regmatch_t *matches
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)
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{
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assert( e != NULL );
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assert( count != NULL );
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if( a == NULL ) {
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if( be == NULL ) {
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a = global_acl;
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} else {
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a = be->be_acl;
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}
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assert( a != NULL );
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} else {
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a = a->acl_next;
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}
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for ( ; a != NULL; a = a->acl_next ) {
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(*count) ++;
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if (a->acl_dn_pat != NULL) {
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Debug( LDAP_DEBUG_ACL, "=> dnpat: [%d] %s nsub: %d\n",
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*count, a->acl_dn_pat, (int) a->acl_dn_re.re_nsub );
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if (regexec(&a->acl_dn_re, e->e_ndn, nmatch, matches, 0)) {
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continue;
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} else {
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Debug( LDAP_DEBUG_ACL, "=> acl_get: [%d] matched\n",
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*count, 0, 0);
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}
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}
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if ( a->acl_filter != NULL ) {
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if ( test_filter( NULL, NULL, NULL, e, a->acl_filter ) != 0 ) {
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continue;
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}
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}
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Debug( LDAP_DEBUG_ACL, "=> acl_get: [%d] check attr %s\n",
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*count, attr, 0);
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if ( attr == NULL || a->acl_attrs == NULL ||
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charray_inlist( a->acl_attrs, attr ) )
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{
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Debug( LDAP_DEBUG_ACL,
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"<= acl_get: [%d] acl %s attr: %s\n",
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*count, e->e_dn, attr );
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return a;
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}
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matches[0].rm_so = matches[0].rm_eo = -1;
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}
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Debug( LDAP_DEBUG_ACL, "<= acl_get: done.\n", 0, 0, 0 );
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return( NULL );
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}
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/*
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* acl_mask - modifies mask based upon the given acl and the
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* requested access to entry e, attribute attr, value val. if val
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* is null, access to the whole attribute is assumed (all values).
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*
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* returns 0 access NOT allowed
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* 1 access allowed
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*/
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static slap_control_t
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acl_mask(
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AccessControl *a,
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slap_access_mask_t *mask,
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Backend *be,
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Connection *conn,
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Operation *op,
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Entry *e,
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char *attr,
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struct berval *val,
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regmatch_t *matches
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)
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{
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int i;
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Access *b;
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char accessmaskbuf[ACCESSMASK_MAXLEN];
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assert( a != NULL );
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assert( mask != NULL );
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Debug( LDAP_DEBUG_ACL,
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"=> acl_mask: access to entry \"%s\", attr \"%s\" requested\n",
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e->e_dn, attr, 0 );
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Debug( LDAP_DEBUG_ACL,
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"=> acl_mask: to value \"%s\" by \"%s\", (%s) \n",
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val ? val->bv_val : "*",
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op->o_ndn ? op->o_ndn : "",
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accessmask2str( *mask, accessmaskbuf ) );
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for ( i = 1, b = a->acl_access; b != NULL; b = b->a_next, i++ ) {
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slap_access_mask_t oldmask, modmask;
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ACL_INVALIDATE( modmask );
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/* AND <who> clauses */
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if ( b->a_dn_pat != NULL ) {
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Debug( LDAP_DEBUG_ACL, "<= check a_dn_pat: %s\n",
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b->a_dn_pat, 0, 0);
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/*
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* if access applies to the entry itself, and the
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* user is bound as somebody in the same namespace as
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* the entry, OR the given dn matches the dn pattern
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*/
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if ( strcmp( b->a_dn_pat, "anonymous" ) == 0 ) {
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if (op->o_ndn != NULL && op->o_ndn[0] != '\0' ) {
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continue;
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}
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} else if ( strcmp( b->a_dn_pat, "users" ) == 0 ) {
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if (op->o_ndn == NULL || op->o_ndn[0] == '\0' ) {
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continue;
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}
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} else if ( strcmp( b->a_dn_pat, "self" ) == 0 ) {
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if( op->o_ndn == NULL || op->o_ndn[0] == '\0' ) {
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continue;
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}
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if ( e->e_dn == NULL || strcmp( e->e_ndn, op->o_ndn ) != 0 ) {
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continue;
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}
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} else if ( strcmp( b->a_dn_pat, "*" ) != 0 ) {
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int ret = regex_matches( b->a_dn_pat,
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op->o_ndn, e->e_ndn, matches );
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if( ret == 0 ) {
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continue;
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}
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}
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}
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if ( b->a_sockurl_pat != NULL ) {
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Debug( LDAP_DEBUG_ACL, "<= check a_sockurl_pat: %s\n",
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b->a_sockurl_pat, 0, 0 );
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if ( strcmp( b->a_sockurl_pat, "*" ) != 0 &&
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!regex_matches( b->a_sockurl_pat, conn->c_listener_url,
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e->e_ndn, matches ) )
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{
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continue;
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}
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}
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if ( b->a_domain_pat != NULL ) {
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Debug( LDAP_DEBUG_ACL, "<= check a_domain_pat: %s\n",
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b->a_domain_pat, 0, 0 );
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if ( strcmp( b->a_domain_pat, "*" ) != 0 &&
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!regex_matches( b->a_domain_pat, conn->c_peer_domain,
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e->e_ndn, matches ) )
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{
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continue;
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}
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}
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if ( b->a_peername_pat != NULL ) {
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Debug( LDAP_DEBUG_ACL, "<= check a_peername_path: %s\n",
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b->a_peername_pat, 0, 0 );
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if ( strcmp( b->a_peername_pat, "*" ) != 0 &&
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!regex_matches( b->a_peername_pat, conn->c_peer_name,
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e->e_ndn, matches ) )
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{
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continue;
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}
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}
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if ( b->a_sockname_pat != NULL ) {
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Debug( LDAP_DEBUG_ACL, "<= check a_sockname_path: %s\n",
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b->a_sockname_pat, 0, 0 );
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if ( strcmp( b->a_sockname_pat, "*" ) != 0 &&
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!regex_matches( b->a_sockname_pat, conn->c_sock_name,
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e->e_ndn, matches ) )
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{
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continue;
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}
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}
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if ( b->a_dn_at != NULL && op->o_ndn != NULL ) {
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Attribute *at;
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struct berval bv;
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Debug( LDAP_DEBUG_ACL, "<= check a_dn_at: %s\n",
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b->a_dn_at, 0, 0);
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bv.bv_val = op->o_ndn;
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bv.bv_len = strlen( bv.bv_val );
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/* see if asker is listed in dnattr */
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if ( (at = attr_find( e->e_attrs, b->a_dn_at )) != NULL &&
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value_find( at->a_vals, &bv, at->a_syntax, 3 ) == 0 )
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{
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if ( b->a_dn_self &&
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(val == NULL || value_cmp( &bv, val, at->a_syntax, 2 )) )
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{
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continue;
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}
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/* asker not listed in dnattr - check for self access */
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} else if ( ! b->a_dn_self || val == NULL ||
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value_cmp( &bv, val, at->a_syntax, 2 ) != 0 )
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{
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continue;
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}
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}
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if ( b->a_group_pat != NULL && op->o_ndn != NULL ) {
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char buf[1024];
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/* b->a_group is an unexpanded entry name, expanded it should be an
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* entry with objectclass group* and we test to see if odn is one of
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* the values in the attribute group
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*/
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/* see if asker is listed in dnattr */
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string_expand(buf, sizeof(buf), b->a_group_pat, e->e_ndn, matches);
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if ( dn_normalize(buf) == NULL ) {
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/* did not expand to a valid dn */
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continue;
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}
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if (backend_group(be, e, buf, op->o_ndn,
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b->a_group_oc, b->a_group_at) != 0)
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{
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continue;
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}
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}
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#ifdef SLAPD_ACI_ENABLED
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if ( b->a_aci_at != NULL ) {
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Attribute *at;
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slap_access_t grant, deny, tgrant, tdeny;
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/* this case works different from the others above.
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* since aci's themselves give permissions, we need
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* to first check b->a_mask, the ACL's access level.
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*/
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if( op->o_ndn == NULL || op->o_ndn[0] == '\0' ) {
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continue;
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}
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if ( e->e_dn == NULL ) {
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continue;
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}
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/* first check if the right being requested
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* is allowed by the ACL clause.
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*/
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if ( ! ACL_GRANT( b->a_mask, *mask ) ) {
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continue;
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}
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/* get the aci attribute */
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at = attr_find( e->e_attrs, b->a_aci_at );
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if ( at == NULL ) {
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continue;
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}
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/* start out with nothing granted, nothing denied */
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ACL_INIT(tgrant);
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ACL_INIT(tdeny);
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/* the aci is an multi-valued attribute. The
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* rights are determined by OR'ing the individual
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* rights given by the acis.
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*/
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for ( i = 0; at->a_vals[i] != NULL; i++ ) {
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if (aci_mask( be, op,
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e, attr, val, at->a_vals[i],
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matches, &grant, &deny ) != 0)
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{
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tgrant |= grant;
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tdeny |= deny;
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}
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}
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/* remove anything that the ACL clause does not allow */
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tgrant &= b->a_mask & ACL_PRIV_MASK;
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tdeny &= ACL_PRIV_MASK;
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/* see if we have anything to contribute */
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if( ACL_IS_INVALID(tgrant) && ACL_IS_INVALID(tdeny) ) {
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continue;
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}
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/* this could be improved by changing acl_mask so that it can deal with
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* by clauses that return grant/deny pairs. Right now, it does either
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* additive or subtractive rights, but not both at the same time. So,
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* we need to combine the grant/deny pair into a single rights mask in
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* a smart way: if either grant or deny is "empty", then we use the
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* opposite as is, otherwise we remove any denied rights from the grant
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* rights mask and construct an additive mask.
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*/
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if (ACL_IS_INVALID(tdeny)) {
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modmask = tgrant | ACL_PRIV_ADDITIVE;
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} else if (ACL_IS_INVALID(tgrant)) {
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modmask = tdeny | ACL_PRIV_SUBSTRACTIVE;
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} else {
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modmask = (tgrant & ~tdeny) | ACL_PRIV_ADDITIVE;
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}
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} else
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#endif
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{
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modmask = b->a_mask;
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}
|
|
|
|
|
|
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" );
|
|
|
|
/* 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;
|
|
}
|
|
|
|
Debug( LDAP_DEBUG_ACL,
|
|
"<= acl_mask: [%d] mask: %s\n",
|
|
i, accessmask2str(*mask, accessmaskbuf), 0 );
|
|
|
|
if( b->a_type == ACL_CONTINUE ) {
|
|
continue;
|
|
|
|
} else if ( b->a_type == ACL_BREAK ) {
|
|
return ACL_BREAK;
|
|
|
|
} else {
|
|
return ACL_STOP;
|
|
}
|
|
}
|
|
|
|
Debug( LDAP_DEBUG_ACL,
|
|
"<= acl_mask: no more <who> clauses, returning %s (stop)\n",
|
|
accessmask2str(*mask, accessmaskbuf), 0, 0 );
|
|
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,
|
|
LDAPModList *mlist
|
|
)
|
|
{
|
|
int i;
|
|
|
|
assert( be != NULL );
|
|
|
|
/* short circuit root database access */
|
|
if ( be_isroot( be, op->o_ndn ) ) {
|
|
Debug( LDAP_DEBUG_ACL,
|
|
"<= acl_access_allowed: granted to database root\n",
|
|
0, 0, 0 );
|
|
return 1;
|
|
}
|
|
|
|
/* use backend default access if no backend acls */
|
|
if( be != NULL && be->be_acl == NULL ) {
|
|
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 );
|
|
|
|
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 ) {
|
|
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 );
|
|
|
|
return global_default_access >= ACL_WRITE;
|
|
#endif
|
|
}
|
|
|
|
for ( ; mlist != NULL; mlist = mlist->ml_next ) {
|
|
/* the lastmod attributes are ignored by ACL checking */
|
|
if ( oc_check_no_usermod_attr( mlist->ml_type ) ) {
|
|
Debug( LDAP_DEBUG_ACL, "Operational attribute: %s access allowed\n",
|
|
mlist->ml_type, 0, 0 );
|
|
continue;
|
|
}
|
|
|
|
switch ( mlist->ml_op & ~LDAP_MOD_BVALUES ) {
|
|
case LDAP_MOD_REPLACE:
|
|
case LDAP_MOD_ADD:
|
|
if ( mlist->ml_bvalues == NULL ) {
|
|
break;
|
|
}
|
|
for ( i = 0; mlist->ml_bvalues[i] != NULL; i++ ) {
|
|
if ( ! access_allowed( be, conn, op, e,
|
|
mlist->ml_type, mlist->ml_bvalues[i],
|
|
ACL_WRITE ) )
|
|
{
|
|
return( 0 );
|
|
}
|
|
}
|
|
break;
|
|
|
|
case LDAP_MOD_DELETE:
|
|
if ( mlist->ml_bvalues == NULL ) {
|
|
if ( ! access_allowed( be, conn, op, e,
|
|
mlist->ml_type, NULL,
|
|
ACL_WRITE ) )
|
|
{
|
|
return( 0 );
|
|
}
|
|
break;
|
|
}
|
|
for ( i = 0; mlist->ml_bvalues[i] != NULL; i++ ) {
|
|
if ( ! access_allowed( be, conn, op, e,
|
|
mlist->ml_type, mlist->ml_bvalues[i],
|
|
ACL_WRITE ) )
|
|
{
|
|
return( 0 );
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
return( 1 );
|
|
}
|
|
|
|
#ifdef SLAPD_ACI_ENABLED
|
|
static char *
|
|
aci_bvstrdup (struct berval *bv)
|
|
{
|
|
char *s;
|
|
|
|
s = (char *)ch_malloc(bv->bv_len + 1);
|
|
if (s != NULL) {
|
|
memcpy(s, bv->bv_val, bv->bv_len);
|
|
s[bv->bv_len] = 0;
|
|
}
|
|
return(s);
|
|
}
|
|
|
|
static int
|
|
aci_strbvcmp (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);
|
|
}
|
|
|
|
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, 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 <attr> part of an aci's
|
|
* rights list is of the form <attr>=<value>,
|
|
* that means the aci applies only to attrs with
|
|
* the given value. Furthermore, if the attr is
|
|
* of the form <attr>=<value>*, then <value> 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, 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,
|
|
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, '$', &perm) >= 0; i++) {
|
|
if (aci_get_part(&perm, 0, ';', &actn) < 0)
|
|
continue;
|
|
if (aci_strbvcmp( "grant", &actn ) == 0) {
|
|
mask = grant;
|
|
} else if (aci_strbvcmp( "deny", &actn ) == 0) {
|
|
mask = deny;
|
|
} else {
|
|
continue;
|
|
}
|
|
|
|
found = 1;
|
|
*mask |= aci_list_get_attr_rights(&perm, attr, val);
|
|
*mask |= aci_list_get_attr_rights(&perm, "[all]", NULL);
|
|
}
|
|
return(found);
|
|
}
|
|
|
|
static int
|
|
aci_group_member (
|
|
struct berval *subj,
|
|
char *grpoc,
|
|
char *grpat,
|
|
Backend *be,
|
|
Entry *e,
|
|
Operation *op,
|
|
regmatch_t *matches
|
|
)
|
|
{
|
|
struct berval bv;
|
|
char *subjdn, *grpdn;
|
|
int rc = 0;
|
|
|
|
/* format of string is "group/objectClassValue/groupAttrName" */
|
|
if (aci_get_part(subj, 0, '/', &bv) < 0)
|
|
return(0);
|
|
subjdn = aci_bvstrdup(&bv);
|
|
if (subjdn == NULL)
|
|
return(0);
|
|
|
|
if (aci_get_part(subj, 1, '/', &bv) < 0)
|
|
grpoc = ch_strdup(grpoc);
|
|
else
|
|
grpoc = aci_bvstrdup(&bv);
|
|
|
|
if (aci_get_part(subj, 2, '/', &bv) < 0)
|
|
grpat = ch_strdup(grpat);
|
|
else
|
|
grpat = aci_bvstrdup(&bv);
|
|
|
|
grpdn = (char *)ch_malloc(1024);
|
|
if (grpoc != NULL && grpat != NULL && grpdn != NULL) {
|
|
string_expand(grpdn, 1024, subjdn, e->e_ndn, matches);
|
|
if ( dn_normalize(grpdn) != NULL ) {
|
|
rc = (backend_group(be, e, grpdn, op->o_ndn, grpoc, grpat) == 0);
|
|
}
|
|
ch_free(grpdn);
|
|
}
|
|
if (grpat != NULL)
|
|
ch_free(grpat);
|
|
if (grpoc != NULL)
|
|
ch_free(grpoc);
|
|
ch_free(subjdn);
|
|
return(rc);
|
|
}
|
|
|
|
static int
|
|
aci_mask (
|
|
Backend *be,
|
|
Operation *op,
|
|
Entry *e,
|
|
char *attr,
|
|
struct berval *val,
|
|
struct berval *aci,
|
|
regmatch_t *matches,
|
|
slap_access_t *grant,
|
|
slap_access_t *deny
|
|
)
|
|
{
|
|
struct berval bv, perms, sdn;
|
|
char *subjdn;
|
|
int rc, i;
|
|
|
|
/* parse an aci of the form:
|
|
oid#scope#action;rights;attr;rights;attr$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);
|
|
for (i = 0; supportedACIMechs[i] != NULL; i++) {
|
|
if (aci_strbvcmp( supportedACIMechs[i], &bv ) == 0)
|
|
break;
|
|
}
|
|
if (supportedACIMechs[i] == NULL)
|
|
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) {
|
|
Attribute *at;
|
|
char *attrname;
|
|
|
|
attrname = aci_bvstrdup(&sdn);
|
|
at = attr_find(e->e_attrs, attrname);
|
|
ch_free(attrname);
|
|
|
|
if (at != NULL) {
|
|
bv.bv_val = op->o_ndn;
|
|
bv.bv_len = strlen( bv.bv_val );
|
|
|
|
if (value_find( at->a_vals, &bv, at->a_syntax, 3 ) == 0 )
|
|
return(1);
|
|
}
|
|
|
|
} else if (aci_strbvcmp( "group", &bv ) == 0) {
|
|
if (aci_group_member(&sdn, "groupOfNames", "member", be, e, op, matches))
|
|
return(1);
|
|
|
|
} else if (aci_strbvcmp( "role", &bv ) == 0) {
|
|
if (aci_group_member(&sdn, "organizationalRole", "roleOccupant", be, e, op, matches))
|
|
return(1);
|
|
}
|
|
|
|
return(0);
|
|
}
|
|
|
|
char *
|
|
get_supported_acimech (int index)
|
|
{
|
|
if (index < 0 || index >= (sizeof(supportedACIMechs) / sizeof(char *)))
|
|
return(NULL);
|
|
return(supportedACIMechs[index]);
|
|
}
|
|
|
|
#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';
|
|
|
|
Debug( LDAP_DEBUG_TRACE, "=> string_expand: pattern: %s\n", pat, 0, 0 );
|
|
Debug( LDAP_DEBUG_TRACE, "=> string_expand: expanded: %s\n", newbuf, 0, 0 );
|
|
}
|
|
|
|
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));
|
|
|
|
Debug( LDAP_DEBUG_TRACE,
|
|
"compile( \"%s\", \"%s\") failed %s\n",
|
|
pat, str, error );
|
|
return( 0 );
|
|
}
|
|
|
|
rc = regexec(&re, str, 0, NULL, 0);
|
|
regfree( &re );
|
|
|
|
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 );
|
|
return( !rc );
|
|
}
|
|
|