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openldap/servers/slapd/acl.c
Pierangelo Masarati 4abbf9c610 implement add/delete granularity in write access (ITS#3631)
2005-04-08 00:18:24 +00:00

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/* acl.c - routines to parse and check acl's */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 1998-2005 The OpenLDAP Foundation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted only as authorized by the OpenLDAP
* Public License.
*
* A copy of this license is available in the file LICENSE in the
* top-level directory of the distribution or, alternatively, at
* <http://www.OpenLDAP.org/license.html>.
*/
/* Portions Copyright (c) 1995 Regents of the University of Michigan.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and that due credit is given
* to the University of Michigan at Ann Arbor. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific prior written permission. This software
* is provided ``as is'' without express or implied warranty.
*/
#include "portable.h"
#include <stdio.h>
#include <ac/regex.h>
#include <ac/socket.h>
#include <ac/string.h>
#include "slap.h"
#include "sets.h"
#include "lber_pvt.h"
#include "lutil.h"
#ifdef LDAP_SLAPI
#include "slapi/slapi.h"
#endif /* LDAPI_SLAPI */
#define ACL_BUF_SIZE 1024 /* use most appropriate size */
/*
* speed up compares
*/
static struct berval
aci_bv_entry = BER_BVC("entry"),
aci_bv_children = BER_BVC("children"),
aci_bv_onelevel = BER_BVC("onelevel"),
aci_bv_subtree = BER_BVC("subtree"),
aci_bv_br_entry = BER_BVC("[entry]"),
aci_bv_br_all = BER_BVC("[all]"),
aci_bv_access_id = BER_BVC("access-id"),
aci_bv_anonymous = BER_BVC("anonymous"),
aci_bv_public = BER_BVC("public"),
aci_bv_users = BER_BVC("users"),
aci_bv_self = BER_BVC("self"),
aci_bv_dnattr = BER_BVC("dnattr"),
aci_bv_group = BER_BVC("group"),
aci_bv_role = BER_BVC("role"),
aci_bv_set = BER_BVC("set"),
aci_bv_set_ref = BER_BVC("set-ref"),
aci_bv_grant = BER_BVC("grant"),
aci_bv_deny = BER_BVC("deny"),
aci_bv_ip_eq = BER_BVC("IP="),
#ifdef LDAP_PF_LOCAL
aci_bv_path_eq = BER_BVC("PATH="),
aci_bv_dirsep = BER_BVC(LDAP_DIRSEP),
#endif /* LDAP_PF_LOCAL */
aci_bv_group_class = BER_BVC(SLAPD_GROUP_CLASS),
aci_bv_group_attr = BER_BVC(SLAPD_GROUP_ATTR),
aci_bv_role_class = BER_BVC(SLAPD_ROLE_CLASS),
aci_bv_role_attr = BER_BVC(SLAPD_ROLE_ATTR),
aci_bv_set_attr = BER_BVC(SLAPD_ACI_SET_ATTR);
typedef enum slap_aci_scope_t {
SLAP_ACI_SCOPE_ENTRY = 0x1,
SLAP_ACI_SCOPE_CHILDREN = 0x2,
SLAP_ACI_SCOPE_SUBTREE = ( SLAP_ACI_SCOPE_ENTRY | SLAP_ACI_SCOPE_CHILDREN )
} slap_aci_scope_t;
static AccessControl * acl_get(
AccessControl *ac, int *count,
Operation *op, Entry *e,
AttributeDescription *desc,
struct berval *val,
int nmatch, regmatch_t *matches,
AccessControlState *state );
static slap_control_t acl_mask(
AccessControl *ac, slap_mask_t *mask,
Operation *op, Entry *e,
AttributeDescription *desc,
struct berval *val,
int nmatch,
regmatch_t *matches,
int count,
AccessControlState *state );
#ifdef SLAPD_ACI_ENABLED
static int aci_mask(
Operation *op, Entry *e,
AttributeDescription *desc,
struct berval *val,
struct berval *aci,
int nmatch,
regmatch_t *matches,
slap_access_t *grant,
slap_access_t *deny,
slap_aci_scope_t scope);
#endif /* SLAPD_ACI_ENABLED */
static int regex_matches(
struct berval *pat, char *str, char *buf,
int nmatch, regmatch_t *matches);
static int string_expand(
struct berval *newbuf, struct berval *pattern,
char *match, int nmatch, regmatch_t *matches);
typedef struct AciSetCookie {
Operation *op;
Entry *e;
} AciSetCookie;
SLAP_SET_GATHER aci_set_gather;
SLAP_SET_GATHER aci_set_gather2;
static int aci_match_set ( struct berval *subj, Operation *op,
Entry *e, 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
*
* Notes:
* - can be legally called with op == NULL
* - can be legally called with op->o_bd == NULL
*/
int
access_allowed_mask(
Operation *op,
Entry *e,
AttributeDescription *desc,
struct berval *val,
slap_access_t access,
AccessControlState *state,
slap_mask_t *maskp )
{
int ret = 1;
int count;
AccessControl *a = NULL;
Backend *be;
int be_null = 0;
#ifdef LDAP_DEBUG
char accessmaskbuf[ACCESSMASK_MAXLEN];
#endif
slap_mask_t mask;
slap_control_t control;
slap_access_t access_level;
const char *attr;
regmatch_t matches[MAXREMATCHES];
int st_same_attr = 0;
static AccessControlState state_init = ACL_STATE_INIT;
assert( e != NULL );
assert( desc != NULL );
access_level = ACL_LEVEL( access );
assert( access_level > ACL_NONE );
if ( maskp ) ACL_INVALIDATE( *maskp );
attr = desc->ad_cname.bv_val;
assert( attr != NULL );
if( op && op->o_is_auth_check &&
( access_level == ACL_SEARCH || access_level == ACL_READ ))
{
access = ACL_AUTH;
}
if( state ) {
if ( state->as_vd_ad==desc) {
if ( state->as_recorded ) {
if( state->as_recorded & ACL_STATE_RECORDED_NV &&
val == NULL )
{
return state->as_result;
} else if ( state->as_recorded & ACL_STATE_RECORDED_VD &&
val != NULL && state->as_vd_acl == NULL )
{
return state->as_result;
}
}
st_same_attr = 1;
} else {
*state = state_init;
}
state->as_vd_ad=desc;
}
Debug( LDAP_DEBUG_ACL,
"=> access_allowed: %s access to \"%s\" \"%s\" requested\n",
access2str( access ), e->e_dn, attr );
if ( op == NULL ) {
/* no-op call */
goto done;
}
be = op->o_bd;
if ( be == NULL ) {
be = LDAP_STAILQ_FIRST(&backendDB);
be_null = 1;
#ifdef LDAP_DEVEL
/*
* FIXME: experimental; use first backend rules
* iff there is no global_acl (ITS#3100) */
if ( frontendDB->be_acl == NULL )
#endif
{
op->o_bd = be;
}
}
assert( be != NULL );
#ifdef LDAP_SLAPI
if ( op->o_pb != NULL ) {
ret = slapi_int_access_allowed( op, e, desc, val, access, state );
if ( ret == 0 ) {
/* ACL plugin denied access */
goto done;
}
}
#endif /* LDAP_SLAPI */
/* grant database root access */
if ( /* be != NULL && */ be_isroot( op ) ) {
Debug( LDAP_DEBUG_ACL,
"<= root access granted\n",
0, 0, 0 );
if ( maskp ) {
mask = ACL_LVL_MANAGE;
}
goto done;
}
/*
* no-user-modification operational attributes are ignored
* by ACL_WRITE checking as any found here are not provided
* by the user
*/
if ( access_level >= ACL_WRITE && is_at_no_user_mod( desc->ad_type )
&& desc != slap_schema.si_ad_entry
&& desc != slap_schema.si_ad_children )
{
Debug( LDAP_DEBUG_ACL, "NoUserMod Operational attribute:"
" %s access granted\n",
attr, 0, 0 );
goto done;
}
/* 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( access ),
be->be_dfltaccess >= access_level ? "granted" : "denied",
op->o_dn.bv_val ? op->o_dn.bv_val : "(anonymous)" );
ret = be->be_dfltaccess >= access_level;
if ( maskp ) {
int i;
mask = ACL_PRIV_LEVEL;
for ( i = ACL_NONE; i <= be->be_dfltaccess; i++ ) {
mask |= ACL_ACCESS2PRIV( i );
}
}
goto done;
#ifdef notdef
/* be is always non-NULL */
/* use global default access if no global acls */
} else if ( be == NULL && frontendDB->be_acl == NULL ) {
Debug( LDAP_DEBUG_ACL,
"=> access_allowed: global default %s access %s to \"%s\"\n",
access2str( access ),
frontendDB->be_dfltaccess >= access_level ? "granted" : "denied", op->o_dn.bv_val );
ret = frontendDB->be_dfltaccess >= access_level;
if ( maskp ) {
int i;
mask = ACL_PRIV_LEVEL;
for ( i = ACL_NONE; i <= global_default_access; i++ ) {
mask |= ACL_ACCESS2PRIV( i );
}
}
goto done;
#endif
}
ret = 0;
control = ACL_BREAK;
if( st_same_attr ) {
assert( state->as_vd_acl != NULL );
a = state->as_vd_acl;
count = state->as_vd_acl_count;
if ( !ACL_IS_INVALID( state->as_vd_acl_mask )) {
mask = state->as_vd_acl_mask;
AC_MEMCPY( matches, state->as_vd_acl_matches, sizeof(matches) );
goto vd_access;
}
} else {
if ( state ) state->as_vi_acl = NULL;
a = NULL;
ACL_INIT(mask);
count = 0;
memset(matches, '\0', sizeof(matches));
}
while((a = acl_get( a, &count, op, e, desc, val,
MAXREMATCHES, matches, state )) != NULL)
{
int i;
for (i = 0; i < MAXREMATCHES && matches[i].rm_so > 0; i++) {
Debug( LDAP_DEBUG_ACL, "=> match[%d]: %d %d ", i,
(int)matches[i].rm_so, (int)matches[i].rm_eo );
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 );
}
}
Debug( LDAP_DEBUG_ARGS, "\n", 0, 0, 0 );
}
if (state) {
if (state->as_vi_acl == a && (state->as_recorded & ACL_STATE_RECORDED_NV)) {
Debug( LDAP_DEBUG_ACL, "access_allowed: result from state (%s)\n", attr, 0, 0 );
ret = state->as_result;
goto done;
} else {
Debug( LDAP_DEBUG_ACL, "access_allowed: no res from state (%s)\n", attr, 0, 0);
}
}
vd_access:
control = acl_mask( a, &mask, op,
e, desc, val, MAXREMATCHES, matches, count, state );
if ( control != ACL_BREAK ) {
break;
}
memset(matches, '\0', sizeof(matches));
}
if ( ACL_IS_INVALID( mask ) ) {
Debug( LDAP_DEBUG_ACL,
"=> access_allowed: \"%s\" (%s) invalid!\n",
e->e_dn, attr, 0 );
ACL_INIT(mask);
} else if ( control == ACL_BREAK ) {
Debug( LDAP_DEBUG_ACL,
"=> access_allowed: no more rules\n", 0, 0, 0);
goto done;
}
Debug( LDAP_DEBUG_ACL,
"=> access_allowed: %s access %s by %s\n",
access2str( access ),
ACL_GRANT(mask, access) ? "granted" : "denied",
accessmask2str( mask, accessmaskbuf, 1 ) );
ret = ACL_GRANT(mask, access);
done:
if( state != NULL ) {
/* If not value-dependent, save ACL in case of more attrs */
if ( !(state->as_recorded & ACL_STATE_RECORDED_VD) ) {
state->as_vi_acl = a;
state->as_result = ret;
}
state->as_recorded |= ACL_STATE_RECORDED;
}
if (be_null) op->o_bd = NULL;
if ( maskp ) *maskp = mask;
return ret;
}
/*
* 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,
Operation *op,
Entry *e,
AttributeDescription *desc,
struct berval *val,
int nmatch,
regmatch_t *matches,
AccessControlState *state )
{
const char *attr;
int dnlen, patlen;
AccessControl *prev;
assert( e != NULL );
assert( count != NULL );
assert( desc != NULL );
attr = desc->ad_cname.bv_val;
assert( attr != NULL );
if( a == NULL ) {
if( op->o_bd == NULL ) {
a = frontendDB->be_acl;
} else {
a = op->o_bd->be_acl;
}
prev = NULL;
assert( a != NULL );
} else {
prev = a;
a = a->acl_next;
}
dnlen = e->e_nname.bv_len;
for ( ; a != NULL; a = a->acl_next ) {
(*count) ++;
if ( a->acl_dn_pat.bv_len || ( a->acl_dn_style != ACL_STYLE_REGEX )) {
if ( a->acl_dn_style == ACL_STYLE_REGEX ) {
Debug( LDAP_DEBUG_ACL, "=> dnpat: [%d] %s nsub: %d\n",
*count, a->acl_dn_pat.bv_val, (int) a->acl_dn_re.re_nsub );
if (regexec(&a->acl_dn_re, e->e_ndn, nmatch, matches, 0))
continue;
} else {
Debug( LDAP_DEBUG_ACL, "=> dn: [%d] %s\n",
*count, a->acl_dn_pat.bv_val, 0 );
patlen = a->acl_dn_pat.bv_len;
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 ) {
int rdnlen = -1, sep = 0;
if ( dnlen <= patlen )
continue;
if ( patlen > 0 ) {
if ( !DN_SEPARATOR( e->e_ndn[dnlen - patlen - 1] ) )
continue;
sep = 1;
}
rdnlen = dn_rdnlen( NULL, &e->e_nname );
if ( rdnlen != dnlen - patlen - sep )
continue;
} else if ( a->acl_dn_style == ACL_STYLE_SUBTREE ) {
if ( dnlen > patlen && !DN_SEPARATOR( e->e_ndn[dnlen - patlen - 1] ) )
continue;
} else if ( a->acl_dn_style == ACL_STYLE_CHILDREN ) {
if ( dnlen <= patlen )
continue;
if ( !DN_SEPARATOR( e->e_ndn[dnlen - patlen - 1] ) )
continue;
}
if ( strcmp( a->acl_dn_pat.bv_val, e->e_ndn + dnlen - patlen ) != 0 )
continue;
}
Debug( LDAP_DEBUG_ACL, "=> acl_get: [%d] matched\n",
*count, 0, 0 );
}
if ( a->acl_attrs && !ad_inlist( desc, a->acl_attrs ) ) {
matches[0].rm_so = matches[0].rm_eo = -1;
continue;
}
/* Is this ACL only for a specific value? */
if ( a->acl_attrval.bv_len ) {
if ( val == NULL ) {
continue;
}
if( state && !( state->as_recorded & ACL_STATE_RECORDED_VD )) {
state->as_recorded |= ACL_STATE_RECORDED_VD;
state->as_vd_acl = prev;
state->as_vd_acl_count = *count;
state->as_vd_access = a->acl_access;
state->as_vd_access_count = 1;
ACL_INVALIDATE( state->as_vd_acl_mask );
}
if ( a->acl_attrval_style == ACL_STYLE_REGEX ) {
Debug( LDAP_DEBUG_ACL,
"acl_get: valpat %s\n",
a->acl_attrval.bv_val, 0, 0 );
if ( regexec( &a->acl_attrval_re, val->bv_val, 0, NULL, 0 ) )
{
continue;
}
} else {
int match = 0;
const char *text;
Debug( LDAP_DEBUG_ACL,
"acl_get: val %s\n",
a->acl_attrval.bv_val, 0, 0 );
if ( a->acl_attrs[0].an_desc->ad_type->sat_syntax != slap_schema.si_syn_distinguishedName ) {
if (value_match( &match, desc,
desc->ad_type->sat_equality, 0,
val, &a->acl_attrval, &text ) != LDAP_SUCCESS ||
match )
continue;
} else {
int patlen, vdnlen;
patlen = a->acl_attrval.bv_len;
vdnlen = val->bv_len;
if ( vdnlen < patlen )
continue;
if ( a->acl_dn_style == ACL_STYLE_BASE ) {
if ( vdnlen > patlen )
continue;
} else if ( a->acl_dn_style == ACL_STYLE_ONE ) {
int rdnlen = -1;
if ( !DN_SEPARATOR( val->bv_val[vdnlen - patlen - 1] ) )
continue;
rdnlen = dn_rdnlen( NULL, val );
if ( rdnlen != vdnlen - patlen - 1 )
continue;
} else if ( a->acl_dn_style == ACL_STYLE_SUBTREE ) {
if ( vdnlen > patlen && !DN_SEPARATOR( val->bv_val[vdnlen - patlen - 1] ) )
continue;
} else if ( a->acl_dn_style == ACL_STYLE_CHILDREN ) {
if ( vdnlen <= patlen )
continue;
if ( !DN_SEPARATOR( val->bv_val[vdnlen - patlen - 1] ) )
continue;
}
if ( strcmp( a->acl_attrval.bv_val, val->bv_val + vdnlen - patlen ))
continue;
}
}
}
if ( a->acl_filter != NULL ) {
ber_int_t rc = test_filter( NULL, e, a->acl_filter );
if ( rc != LDAP_COMPARE_TRUE ) {
continue;
}
}
Debug( LDAP_DEBUG_ACL, "=> acl_get: [%d] attr %s\n",
*count, attr, 0);
return a;
}
Debug( LDAP_DEBUG_ACL, "<= acl_get: done.\n", 0, 0, 0 );
return( NULL );
}
static int
acl_mask_dn(
Operation *op,
Entry *e,
AccessControl *a,
int nmatch,
regmatch_t *matches,
slap_dn_access *b,
struct berval *opndn )
{
/*
* 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
*/
/*
* NOTE: styles "anonymous", "users" and "self"
* have been moved to enum slap_style_t, whose
* value is set in a_dn_style; however, the string
* is maintaned in a_dn_pat.
*/
if ( b->a_style == ACL_STYLE_ANONYMOUS ) {
if ( !BER_BVISEMPTY( opndn ) ) {
return 1;
}
} else if ( b->a_style == ACL_STYLE_USERS ) {
if ( BER_BVISEMPTY( opndn ) ) {
return 1;
}
} else if ( b->a_style == ACL_STYLE_SELF ) {
struct berval ndn, selfndn;
int level;
if ( BER_BVISEMPTY( opndn ) || BER_BVISNULL( &e->e_nname ) ) {
return 1;
}
level = b->a_self_level;
if ( level < 0 ) {
selfndn = *opndn;
ndn = e->e_nname;
level = -level;
} else {
ndn = *opndn;
selfndn = e->e_nname;
}
for ( ; level > 0; level-- ) {
if ( BER_BVISEMPTY( &ndn ) ) {
break;
}
dnParent( &ndn, &ndn );
}
if ( BER_BVISEMPTY( &ndn ) || !dn_match( &ndn, &selfndn ) )
{
return 1;
}
} else if ( b->a_style == ACL_STYLE_REGEX ) {
if ( !ber_bvccmp( &b->a_pat, '*' ) ) {
int tmp_nmatch;
regmatch_t tmp_matches[2],
*tmp_matchesp = tmp_matches;
int rc = 0;
switch ( a->acl_dn_style ) {
case ACL_STYLE_REGEX:
if ( !BER_BVISNULL( &a->acl_dn_pat ) ) {
tmp_matchesp = matches;
tmp_nmatch = nmatch;
break;
}
/* FALLTHRU: applies also to ACL_STYLE_REGEX when pattern is "*" */
case ACL_STYLE_BASE:
tmp_matches[0].rm_so = 0;
tmp_matches[0].rm_eo = e->e_nname.bv_len;
tmp_nmatch = 1;
break;
case ACL_STYLE_ONE:
case ACL_STYLE_SUBTREE:
case ACL_STYLE_CHILDREN:
tmp_matches[0].rm_so = 0;
tmp_matches[0].rm_eo = e->e_nname.bv_len;
tmp_matches[1].rm_so = e->e_nname.bv_len - a->acl_dn_pat.bv_len;
tmp_matches[1].rm_eo = e->e_nname.bv_len;
tmp_nmatch = 2;
break;
default:
/* error */
rc = 1;
break;
}
if ( rc ) {
return 1;
}
if ( !regex_matches( &b->a_pat, opndn->bv_val,
e->e_ndn, tmp_nmatch, tmp_matchesp ) )
{
return 1;
}
}
} else {
struct berval pat;
ber_len_t patlen, odnlen;
int got_match = 0;
if ( e->e_dn == NULL )
return 1;
if ( b->a_expand ) {
struct berval bv;
char buf[ACL_BUF_SIZE];
int tmp_nmatch;
regmatch_t tmp_matches[2],
*tmp_matchesp = tmp_matches;
int rc = 0;
bv.bv_len = sizeof( buf ) - 1;
bv.bv_val = buf;
switch ( a->acl_dn_style ) {
case ACL_STYLE_REGEX:
if ( !BER_BVISNULL( &a->acl_dn_pat ) ) {
tmp_matchesp = matches;
tmp_nmatch = nmatch;
break;
}
/* FALLTHRU: applies also to ACL_STYLE_REGEX when pattern is "*" */
case ACL_STYLE_BASE:
tmp_matches[0].rm_so = 0;
tmp_matches[0].rm_eo = e->e_nname.bv_len;
tmp_nmatch = 1;
break;
case ACL_STYLE_ONE:
case ACL_STYLE_SUBTREE:
case ACL_STYLE_CHILDREN:
tmp_matches[0].rm_so = 0;
tmp_matches[0].rm_eo = e->e_nname.bv_len;
tmp_matches[1].rm_so = e->e_nname.bv_len - a->acl_dn_pat.bv_len;
tmp_matches[1].rm_eo = e->e_nname.bv_len;
tmp_nmatch = 2;
break;
default:
/* error */
rc = 1;
break;
}
if ( rc ) {
return 1;
}
if ( string_expand( &bv, &b->a_pat,
e->e_nname.bv_val,
tmp_nmatch, tmp_matchesp ) )
{
return 1;
}
if ( dnNormalize(0, NULL, NULL, &bv,
&pat, op->o_tmpmemctx )
!= LDAP_SUCCESS )
{
/* did not expand to a valid dn */
return 1;
}
} else {
pat = b->a_pat;
}
patlen = pat.bv_len;
odnlen = opndn->bv_len;
if ( odnlen < patlen ) {
goto dn_match_cleanup;
}
if ( b->a_style == ACL_STYLE_BASE ) {
/* base dn -- entire object DN must match */
if ( odnlen != patlen ) {
goto dn_match_cleanup;
}
} else if ( b->a_style == ACL_STYLE_ONE ) {
int rdnlen = -1;
if ( odnlen <= patlen ) {
goto dn_match_cleanup;
}
if ( !DN_SEPARATOR( opndn->bv_val[odnlen - patlen - 1] ) ) {
goto dn_match_cleanup;
}
rdnlen = dn_rdnlen( NULL, opndn );
if ( rdnlen != odnlen - patlen - 1 ) {
goto dn_match_cleanup;
}
} else if ( b->a_style == ACL_STYLE_SUBTREE ) {
if ( odnlen > patlen && !DN_SEPARATOR( opndn->bv_val[odnlen - patlen - 1] ) ) {
goto dn_match_cleanup;
}
} else if ( b->a_style == ACL_STYLE_CHILDREN ) {
if ( odnlen <= patlen ) {
goto dn_match_cleanup;
}
if ( !DN_SEPARATOR( opndn->bv_val[odnlen - patlen - 1] ) ) {
goto dn_match_cleanup;
}
} else if ( b->a_style == ACL_STYLE_LEVEL ) {
int level;
struct berval ndn;
if ( odnlen <= patlen ) {
goto dn_match_cleanup;
}
if ( level > 0 && !DN_SEPARATOR( opndn->bv_val[odnlen - patlen - 1] ) )
{
goto dn_match_cleanup;
}
level = b->a_level;
ndn = *opndn;
for ( ; level > 0; level-- ) {
if ( BER_BVISEMPTY( &ndn ) ) {
goto dn_match_cleanup;
}
dnParent( &ndn, &ndn );
if ( ndn.bv_len < patlen ) {
goto dn_match_cleanup;
}
}
if ( ndn.bv_len != patlen ) {
goto dn_match_cleanup;
}
}
got_match = !strcmp( pat.bv_val, &opndn->bv_val[ odnlen - patlen ] );
dn_match_cleanup:;
if ( pat.bv_val != b->a_pat.bv_val ) {
slap_sl_free( pat.bv_val, op->o_tmpmemctx );
}
if ( !got_match ) {
return 1;
}
}
return 0;
}
/*
* Record value-dependent access control state
*/
#define ACL_RECORD_VALUE_STATE do { \
if( state && !( state->as_recorded & ACL_STATE_RECORDED_VD )) { \
state->as_recorded |= ACL_STATE_RECORDED_VD; \
state->as_vd_acl = a; \
AC_MEMCPY( state->as_vd_acl_matches, matches, \
sizeof( state->as_vd_acl_matches )) ; \
state->as_vd_acl_count = count; \
state->as_vd_access = b; \
state->as_vd_access_count = i; \
} \
} while( 0 )
static int
acl_mask_dnattr(
Operation *op,
Entry *e,
struct berval *val,
AccessControl *a,
Access *b,
int i,
regmatch_t *matches,
int count,
AccessControlState *state,
slap_dn_access *bdn,
struct berval *opndn )
{
Attribute *at;
struct berval bv;
int rc, match = 0;
const char *text;
const char *attr = bdn->a_at->ad_cname.bv_val;
assert( attr != NULL );
if ( BER_BVISEMPTY( opndn ) ) {
return 1;
}
Debug( LDAP_DEBUG_ACL, "<= check a_dn_at: %s\n", attr, 0, 0 );
bv = *opndn;
/* see if asker is listed in dnattr */
for ( at = attrs_find( e->e_attrs, bdn->a_at );
at != NULL;
at = attrs_find( at->a_next, bdn->a_at ) )
{
if ( value_find_ex( bdn->a_at,
SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
at->a_nvals,
&bv, op->o_tmpmemctx ) == 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 ( bdn->a_self ) {
/* check if the target is an attribute. */
if ( val == NULL ) return 1;
/* target is attribute, check if the attribute value
* is the op dn.
*/
rc = value_match( &match, bdn->a_at,
bdn->a_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 )
return 1;
}
} else {
/* no dnattr match, check if this is a self clause */
if ( ! bdn->a_self )
return 1;
ACL_RECORD_VALUE_STATE;
/* this is a self clause, check if the target is an
* attribute.
*/
if ( val == NULL )
return 1;
/* target is attribute, check if the attribute value
* is the op dn.
*/
rc = value_match( &match, bdn->a_at,
bdn->a_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 )
return 1;
}
return 0;
}
/*
* 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,
Operation *op,
Entry *e,
AttributeDescription *desc,
struct berval *val,
int nmatch,
regmatch_t *matches,
int count,
AccessControlState *state )
{
int i;
Access *b;
#ifdef LDAP_DEBUG
char accessmaskbuf[ACCESSMASK_MAXLEN];
#if !defined( SLAP_DYNACL ) && defined( SLAPD_ACI_ENABLED )
char accessmaskbuf1[ACCESSMASK_MAXLEN];
#endif /* !SLAP_DYNACL && SLAPD_ACI_ENABLED */
#endif /* DEBUG */
const char *attr;
assert( a != NULL );
assert( mask != NULL );
assert( desc != NULL );
attr = desc->ad_cname.bv_val;
assert( attr != NULL );
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.bv_val ? op->o_ndn.bv_val : "",
accessmask2str( *mask, accessmaskbuf, 1) );
if( state && ( state->as_recorded & ACL_STATE_RECORDED_VD )
&& state->as_vd_acl == a )
{
b = state->as_vd_access;
i = state->as_vd_access_count;
} else {
b = a->acl_access;
i = 1;
}
for ( ; b != NULL; b = b->a_next, i++ ) {
slap_mask_t oldmask, modmask;
ACL_INVALIDATE( modmask );
/* AND <who> clauses */
if ( !BER_BVISEMPTY( &b->a_dn_pat ) ) {
Debug( LDAP_DEBUG_ACL, "<= check a_dn_pat: %s\n",
b->a_dn_pat.bv_val, 0, 0);
/*
* 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
*/
/*
* NOTE: styles "anonymous", "users" and "self"
* have been moved to enum slap_style_t, whose
* value is set in a_dn_style; however, the string
* is maintaned in a_dn_pat.
*/
if ( acl_mask_dn( op, e, a, nmatch, matches,
&b->a_dn, &op->o_ndn ) )
{
continue;
}
}
if ( !BER_BVISEMPTY( &b->a_realdn_pat ) ) {
struct berval ndn;
Debug( LDAP_DEBUG_ACL, "<= check a_realdn_pat: %s\n",
b->a_realdn_pat.bv_val, 0, 0);
/*
* 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
*/
/*
* NOTE: styles "anonymous", "users" and "self"
* have been moved to enum slap_style_t, whose
* value is set in a_dn_style; however, the string
* is maintaned in a_dn_pat.
*/
if ( op->o_conn && !BER_BVISNULL( &op->o_conn->c_ndn ) )
{
ndn = op->o_conn->c_ndn;
} else {
ndn = op->o_ndn;
}
if ( acl_mask_dn( op, e, a, nmatch, matches,
&b->a_realdn, &ndn ) )
{
continue;
}
}
if ( !BER_BVISEMPTY( &b->a_sockurl_pat ) ) {
if ( ! op->o_conn->c_listener ) {
continue;
}
Debug( LDAP_DEBUG_ACL, "<= check a_sockurl_pat: %s\n",
b->a_sockurl_pat.bv_val, 0, 0 );
if ( !ber_bvccmp( &b->a_sockurl_pat, '*' ) ) {
if ( b->a_sockurl_style == ACL_STYLE_REGEX) {
if (!regex_matches( &b->a_sockurl_pat, op->o_conn->c_listener_url.bv_val,
e->e_ndn, nmatch, matches ) )
{
continue;
}
} else if ( b->a_sockurl_style == ACL_STYLE_EXPAND ) {
struct berval bv;
char buf[ACL_BUF_SIZE];
bv.bv_len = sizeof( buf ) - 1;
bv.bv_val = buf;
if ( string_expand( &bv, &b->a_sockurl_pat,
e->e_ndn, nmatch, matches ) )
{
continue;
}
if ( ber_bvstrcasecmp( &bv, &op->o_conn->c_listener_url ) != 0 )
{
continue;
}
} else {
if ( ber_bvstrcasecmp( &b->a_sockurl_pat, &op->o_conn->c_listener_url ) != 0 )
{
continue;
}
}
}
}
if ( !BER_BVISEMPTY( &b->a_domain_pat ) ) {
if ( !op->o_conn->c_peer_domain.bv_val ) {
continue;
}
Debug( LDAP_DEBUG_ACL, "<= check a_domain_pat: %s\n",
b->a_domain_pat.bv_val, 0, 0 );
if ( !ber_bvccmp( &b->a_domain_pat, '*' ) ) {
if ( b->a_domain_style == ACL_STYLE_REGEX) {
if (!regex_matches( &b->a_domain_pat, op->o_conn->c_peer_domain.bv_val,
e->e_ndn, nmatch, matches ) )
{
continue;
}
} else {
char buf[ACL_BUF_SIZE];
struct berval cmp = op->o_conn->c_peer_domain;
struct berval pat = b->a_domain_pat;
if ( b->a_domain_expand ) {
struct berval bv;
bv.bv_len = sizeof(buf) - 1;
bv.bv_val = buf;
if ( string_expand(&bv, &b->a_domain_pat,
e->e_ndn, nmatch, matches) )
{
continue;
}
pat = bv;
}
if ( b->a_domain_style == ACL_STYLE_SUBTREE ) {
int offset = cmp.bv_len - pat.bv_len;
if ( offset < 0 ) {
continue;
}
if ( offset == 1 || ( offset > 1 && cmp.bv_val[ offset - 1 ] != '.' ) ) {
continue;
}
/* trim the domain */
cmp.bv_val = &cmp.bv_val[ offset ];
cmp.bv_len -= offset;
}
if ( ber_bvstrcasecmp( &pat, &cmp ) != 0 ) {
continue;
}
}
}
}
if ( !BER_BVISEMPTY( &b->a_peername_pat ) ) {
if ( !op->o_conn->c_peer_name.bv_val ) {
continue;
}
Debug( LDAP_DEBUG_ACL, "<= check a_peername_path: %s\n",
b->a_peername_pat.bv_val, 0, 0 );
if ( !ber_bvccmp( &b->a_peername_pat, '*' ) ) {
if ( b->a_peername_style == ACL_STYLE_REGEX ) {
if (!regex_matches( &b->a_peername_pat, op->o_conn->c_peer_name.bv_val,
e->e_ndn, nmatch, matches ) )
{
continue;
}
} else {
/* try exact match */
if ( b->a_peername_style == ACL_STYLE_BASE ) {
if ( ber_bvstrcasecmp( &b->a_peername_pat, &op->o_conn->c_peer_name ) != 0 ) {
continue;
}
} else if ( b->a_peername_style == ACL_STYLE_EXPAND ) {
struct berval bv;
char buf[ACL_BUF_SIZE];
bv.bv_len = sizeof( buf ) - 1;
bv.bv_val = buf;
if ( string_expand( &bv, &b->a_peername_pat,
e->e_ndn, nmatch, matches ) )
{
continue;
}
if ( ber_bvstrcasecmp( &bv, &op->o_conn->c_peer_name ) != 0 ) {
continue;
}
/* extract IP and try exact match */
} else if ( b->a_peername_style == ACL_STYLE_IP ) {
char *port;
char buf[] = "255.255.255.255";
struct berval ip;
unsigned long addr;
int port_number = -1;
if ( strncasecmp( op->o_conn->c_peer_name.bv_val,
aci_bv_ip_eq.bv_val, aci_bv_ip_eq.bv_len ) != 0 )
continue;
ip.bv_val = op->o_conn->c_peer_name.bv_val + aci_bv_ip_eq.bv_len;
ip.bv_len = op->o_conn->c_peer_name.bv_len - aci_bv_ip_eq.bv_len;
port = strrchr( ip.bv_val, ':' );
if ( port ) {
char *next;
ip.bv_len = port - ip.bv_val;
++port;
port_number = strtol( port, &next, 10 );
if ( next[0] != '\0' )
continue;
}
/* the port check can be anticipated here */
if ( b->a_peername_port != -1 && port_number != b->a_peername_port )
continue;
/* address longer than expected? */
if ( ip.bv_len >= sizeof(buf) )
continue;
AC_MEMCPY( buf, ip.bv_val, ip.bv_len );
buf[ ip.bv_len ] = '\0';
addr = inet_addr( buf );
/* unable to convert? */
if ( addr == (unsigned long)(-1) )
continue;
if ( (addr & b->a_peername_mask) != b->a_peername_addr )
continue;
#ifdef LDAP_PF_LOCAL
/* extract path and try exact match */
} else if ( b->a_peername_style == ACL_STYLE_PATH ) {
struct berval path;
if ( strncmp( op->o_conn->c_peer_name.bv_val,
aci_bv_path_eq.bv_val, aci_bv_path_eq.bv_len ) != 0 )
continue;
path.bv_val = op->o_conn->c_peer_name.bv_val + aci_bv_path_eq.bv_len;
path.bv_len = op->o_conn->c_peer_name.bv_len - aci_bv_path_eq.bv_len;
if ( ber_bvcmp( &b->a_peername_pat, &path ) != 0 )
continue;
#endif /* LDAP_PF_LOCAL */
/* exact match (very unlikely...) */
} else if ( ber_bvcmp( &op->o_conn->c_peer_name, &b->a_peername_pat ) != 0 ) {
continue;
}
}
}
}
if ( !BER_BVISEMPTY( &b->a_sockname_pat ) ) {
if ( BER_BVISNULL( &op->o_conn->c_sock_name ) ) {
continue;
}
Debug( LDAP_DEBUG_ACL, "<= check a_sockname_path: %s\n",
b->a_sockname_pat.bv_val, 0, 0 );
if ( !ber_bvccmp( &b->a_sockname_pat, '*' ) ) {
if ( b->a_sockname_style == ACL_STYLE_REGEX) {
if (!regex_matches( &b->a_sockname_pat, op->o_conn->c_sock_name.bv_val,
e->e_ndn, nmatch, matches ) )
{
continue;
}
} else if ( b->a_sockname_style == ACL_STYLE_EXPAND ) {
struct berval bv;
char buf[ACL_BUF_SIZE];
bv.bv_len = sizeof( buf ) - 1;
bv.bv_val = buf;
if ( string_expand( &bv, &b->a_sockname_pat,
e->e_ndn, nmatch, matches ) )
{
continue;
}
if ( ber_bvstrcasecmp( &bv, &op->o_conn->c_sock_name ) != 0 ) {
continue;
}
} else {
if ( ber_bvstrcasecmp( &b->a_sockname_pat, &op->o_conn->c_sock_name ) != 0 ) {
continue;
}
}
}
}
if ( b->a_dn_at != NULL ) {
if ( acl_mask_dnattr( op, e, val, a, b, i,
matches, count, state,
&b->a_dn, &op->o_ndn ) )
{
continue;
}
}
if ( b->a_realdn_at != NULL ) {
struct berval ndn;
if ( op->o_conn && !BER_BVISNULL( &op->o_conn->c_ndn ) )
{
ndn = op->o_conn->c_ndn;
} else {
ndn = op->o_ndn;
}
if ( acl_mask_dnattr( op, e, val, a, b, i,
matches, count, state,
&b->a_realdn, &ndn ) )
{
continue;
}
}
if ( !BER_BVISEMPTY( &b->a_group_pat ) ) {
struct berval bv;
struct berval ndn = BER_BVNULL;
int rc;
if ( op->o_ndn.bv_len == 0 ) {
continue;
}
/* 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_EXPAND ) {
char buf[ACL_BUF_SIZE];
int tmp_nmatch;
regmatch_t tmp_matches[2],
*tmp_matchesp = tmp_matches;
bv.bv_len = sizeof(buf) - 1;
bv.bv_val = buf;
rc = 0;
switch ( a->acl_dn_style ) {
case ACL_STYLE_REGEX:
if ( !BER_BVISNULL( &a->acl_dn_pat ) ) {
tmp_matchesp = matches;
tmp_nmatch = nmatch;
break;
}
/* FALLTHRU: applies also to ACL_STYLE_REGEX when pattern is "*" */
case ACL_STYLE_BASE:
tmp_matches[0].rm_so = 0;
tmp_matches[0].rm_eo = e->e_nname.bv_len;
tmp_nmatch = 1;
break;
case ACL_STYLE_ONE:
case ACL_STYLE_SUBTREE:
case ACL_STYLE_CHILDREN:
tmp_matches[0].rm_so = 0;
tmp_matches[0].rm_eo = e->e_nname.bv_len;
tmp_matches[1].rm_so = e->e_nname.bv_len - a->acl_dn_pat.bv_len;
tmp_matches[1].rm_eo = e->e_nname.bv_len;
tmp_nmatch = 2;
break;
default:
/* error */
rc = 1;
break;
}
if ( rc ) {
continue;
}
if ( string_expand( &bv, &b->a_group_pat,
e->e_nname.bv_val,
tmp_nmatch, tmp_matchesp ) )
{
continue;
}
if ( dnNormalize( 0, NULL, NULL, &bv, &ndn,
op->o_tmpmemctx ) != LDAP_SUCCESS )
{
/* did not expand to a valid dn */
continue;
}
bv = ndn;
} else {
bv = b->a_group_pat;
}
rc = backend_group( op, e, &bv, &op->o_ndn,
b->a_group_oc, b->a_group_at );
if ( ndn.bv_val ) {
slap_sl_free( ndn.bv_val, op->o_tmpmemctx );
}
if ( rc != 0 ) {
continue;
}
}
if ( !BER_BVISEMPTY( &b->a_set_pat ) ) {
struct berval bv;
char buf[ACL_BUF_SIZE];
if ( b->a_set_style == ACL_STYLE_EXPAND ) {
int tmp_nmatch;
regmatch_t tmp_matches[2],
*tmp_matchesp = tmp_matches;
int rc = 0;
bv.bv_len = sizeof( buf ) - 1;
bv.bv_val = buf;
rc = 0;
switch ( a->acl_dn_style ) {
case ACL_STYLE_REGEX:
if ( !BER_BVISNULL( &a->acl_dn_pat ) ) {
tmp_matchesp = matches;
tmp_nmatch = nmatch;
break;
}
/* FALLTHRU: applies also to ACL_STYLE_REGEX when pattern is "*" */
case ACL_STYLE_BASE:
tmp_matches[0].rm_so = 0;
tmp_matches[0].rm_eo = e->e_nname.bv_len;
tmp_nmatch = 1;
break;
case ACL_STYLE_ONE:
case ACL_STYLE_SUBTREE:
case ACL_STYLE_CHILDREN:
tmp_matches[0].rm_so = 0;
tmp_matches[0].rm_eo = e->e_nname.bv_len;
tmp_matches[1].rm_so = e->e_nname.bv_len - a->acl_dn_pat.bv_len;
tmp_matches[1].rm_eo = e->e_nname.bv_len;
tmp_nmatch = 2;
break;
default:
/* error */
rc = 1;
break;
}
if ( rc ) {
continue;
}
if ( string_expand( &bv, &b->a_set_pat,
e->e_nname.bv_val,
tmp_nmatch, tmp_matchesp ) )
{
continue;
}
} else {
bv = b->a_set_pat;
}
if ( aci_match_set( &bv, op, e, 0 ) == 0 ) {
continue;
}
}
if ( b->a_authz.sai_ssf ) {
Debug( LDAP_DEBUG_ACL, "<= check a_authz.sai_ssf: ACL %u > OP %u\n",
b->a_authz.sai_ssf, op->o_ssf, 0 );
if ( b->a_authz.sai_ssf > op->o_ssf ) {
continue;
}
}
if ( b->a_authz.sai_transport_ssf ) {
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 );
if ( b->a_authz.sai_transport_ssf > op->o_transport_ssf ) {
continue;
}
}
if ( b->a_authz.sai_tls_ssf ) {
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 );
if ( b->a_authz.sai_tls_ssf > op->o_tls_ssf ) {
continue;
}
}
if ( b->a_authz.sai_sasl_ssf ) {
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 );
if ( b->a_authz.sai_sasl_ssf > op->o_sasl_ssf ) {
continue;
}
}
#ifdef SLAP_DYNACL
if ( b->a_dynacl ) {
slap_dynacl_t *da;
slap_access_t 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 ( BER_BVISEMPTY( &e->e_nname ) ) {
/* no ACIs in the root DSE */
continue;
}
/* first check if the right being requested
* is allowed by the ACL clause.
*/
if ( ! ACL_GRANT( b->a_access_mask, *mask ) ) {
continue;
}
/* start out with nothing granted, nothing denied */
ACL_INIT(tgrant);
ACL_INIT(tdeny);
for ( da = b->a_dynacl; da; da = da->da_next ) {
slap_access_t grant, deny;
(void)( *da->da_mask )( da->da_private, op, e, desc, val, nmatch, matches, &grant, &deny );
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
#else /* !SLAP_DYNACL */
#ifdef SLAPD_ACI_ENABLED
if ( b->a_aci_at != NULL ) {
Attribute *at;
slap_access_t grant, deny, tgrant, tdeny;
struct berval parent_ndn;
BerVarray bvals = NULL;
int ret, stop;
/* 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 ( BER_BVISEMPTY( &e->e_nname ) ) {
/* no ACIs in the root DSE */
continue;
}
/* first check if the right being requested
* is allowed by the ACL clause.
*/
if ( ! ACL_GRANT( b->a_access_mask, *mask ) ) {
continue;
}
/* start out with nothing granted, nothing denied */
ACL_INIT(tgrant);
ACL_INIT(tdeny);
/* get the aci attribute */
at = attr_find( e->e_attrs, b->a_aci_at );
if ( at != NULL ) {
#if 0
/* FIXME: this breaks acl caching;
* see also ACL_RECORD_VALUE_STATE below */
ACL_RECORD_VALUE_STATE;
#endif
/* the aci is an multi-valued attribute. The
* rights are determined by OR'ing the individual
* rights given by the acis.
*/
for ( i = 0; !BER_BVISNULL( &at->a_nvals[i] ); i++ ) {
if (aci_mask( op,
e, desc, val,
&at->a_nvals[i],
nmatch, matches,
&grant, &deny, SLAP_ACI_SCOPE_ENTRY ) != 0)
{
tgrant |= grant;
tdeny |= deny;
}
}
Debug(LDAP_DEBUG_ACL, "<= aci_mask grant %s deny %s\n",
accessmask2str(tgrant, accessmaskbuf, 1),
accessmask2str(tdeny, accessmaskbuf1, 1), 0);
}
/* If the entry level aci didn't contain anything valid for the
* current operation, climb up the tree and evaluate the
* acis with scope set to subtree
*/
if ( (tgrant == ACL_PRIV_NONE) && (tdeny == ACL_PRIV_NONE) ) {
dnParent( &e->e_nname, &parent_ndn );
while ( !BER_BVISEMPTY( &parent_ndn ) ) {
Debug(LDAP_DEBUG_ACL, "checking ACI of %s\n", parent_ndn.bv_val, 0, 0);
ret = backend_attribute(op, NULL, &parent_ndn, b->a_aci_at, &bvals, ACL_AUTH);
switch(ret){
case LDAP_SUCCESS :
stop = 0;
if (!bvals){
break;
}
for( i = 0; bvals[i].bv_val != NULL; i++){
#if 0
/* FIXME: this breaks acl caching;
* see also ACL_RECORD_VALUE_STATE above */
ACL_RECORD_VALUE_STATE;
#endif
if (aci_mask(op, e, desc, val, &bvals[i],
nmatch, matches,
&grant, &deny, SLAP_ACI_SCOPE_CHILDREN ) != 0 )
{
tgrant |= grant;
tdeny |= deny;
/* evaluation stops as soon as either a "deny" or a
* "grant" directive matches.
*/
if( (tgrant != ACL_PRIV_NONE) || (tdeny != ACL_PRIV_NONE) ){
stop = 1;
}
}
Debug(LDAP_DEBUG_ACL, "<= aci_mask grant %s deny %s\n",
accessmask2str(tgrant, accessmaskbuf, 1),
accessmask2str(tdeny, accessmaskbuf1, 1), 0);
}
break;
case LDAP_NO_SUCH_ATTRIBUTE:
/* just go on if the aci-Attribute is not present in
* the current entry
*/
Debug(LDAP_DEBUG_ACL, "no such attribute\n", 0, 0, 0);
stop = 0;
break;
case LDAP_NO_SUCH_OBJECT:
/* We have reached the base object */
Debug(LDAP_DEBUG_ACL, "no such object\n", 0, 0, 0);
stop = 1;
break;
default:
stop = 1;
break;
}
if (stop){
break;
}
dnParent( &parent_ndn, &parent_ndn );
}
}
/* 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 /* SLAPD_ACI_ENABLED */
#endif /* !SLAP_DYNACL */
{
modmask = b->a_access_mask;
}
Debug( LDAP_DEBUG_ACL,
"<= acl_mask: [%d] applying %s (%s)\n",
i, accessmask2str( modmask, accessmaskbuf, 1 ),
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, 1), 0 );
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);
Debug( LDAP_DEBUG_ACL,
"<= acl_mask: no more <who> clauses, returning %s (stop)\n",
accessmask2str(*mask, accessmaskbuf, 1), 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(
Operation *op,
Entry *e,
Modifications *mlist
)
{
struct berval *bv;
AccessControlState state = ACL_STATE_INIT;
Backend *be;
int be_null = 0;
int ret = 1; /* default is access allowed */
be = op->o_bd;
if ( be == NULL ) {
be = LDAP_STAILQ_FIRST(&backendDB);
be_null = 1;
op->o_bd = be;
}
assert( be != NULL );
/* short circuit root database access */
if ( be_isroot( op ) ) {
Debug( LDAP_DEBUG_ACL,
"<= acl_access_allowed: granted to database root\n",
0, 0, 0 );
goto done;
}
/* use backend default access if no backend acls */
if( op->o_bd != NULL && op->o_bd->be_acl == NULL ) {
Debug( LDAP_DEBUG_ACL,
"=> access_allowed: backend default %s access %s to \"%s\"\n",
access2str( ACL_WRITE ),
op->o_bd->be_dfltaccess >= ACL_WRITE
? "granted" : "denied",
op->o_dn.bv_val );
ret = (op->o_bd->be_dfltaccess >= ACL_WRITE);
goto done;
}
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 ) ) {
Debug( LDAP_DEBUG_ACL, "acl: no-user-mod %s:"
" modify access granted\n",
mlist->sml_desc->ad_cname.bv_val, 0, 0 );
continue;
}
switch ( mlist->sml_op ) {
case LDAP_MOD_REPLACE:
/*
* We must check both permission to delete the whole
* attribute and permission to add the specific attributes.
* This prevents abuse from selfwriters.
*/
if ( ! access_allowed( op, e,
mlist->sml_desc, NULL, ACL_WDEL, &state ) )
{
ret = 0;
goto done;
}
if ( mlist->sml_values == NULL ) break;
/* fall thru to check value to add */
case LDAP_MOD_ADD:
assert( mlist->sml_values != NULL );
for ( bv = mlist->sml_nvalues
? mlist->sml_nvalues : mlist->sml_values;
bv->bv_val != NULL; bv++ )
{
if ( ! access_allowed( op, e,
mlist->sml_desc, bv, ACL_WADD, &state ) )
{
ret = 0;
goto done;
}
}
break;
case LDAP_MOD_DELETE:
if ( mlist->sml_values == NULL ) {
if ( ! access_allowed( op, e,
mlist->sml_desc, NULL, ACL_WDEL, NULL ) )
{
ret = 0;
goto done;
}
break;
}
for ( bv = mlist->sml_nvalues
? mlist->sml_nvalues : mlist->sml_values;
bv->bv_val != NULL; bv++ )
{
if ( ! access_allowed( op, e,
mlist->sml_desc, bv, ACL_WDEL, &state ) )
{
ret = 0;
goto done;
}
}
break;
case SLAP_MOD_SOFTADD:
/* allow adding attribute via modrdn thru */
break;
default:
assert( 0 );
/* not reached */
ret = 0;
break;
}
}
done:
if (be_null) op->o_bd = NULL;
return( ret );
}
static int
aci_get_part(
struct berval *list,
int ix,
char sep,
struct berval *bv )
{
int len;
char *p;
if ( bv ) {
BER_BVZERO( bv );
}
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;
}
typedef struct aci_set_gather_t {
SetCookie *cookie;
BerVarray bvals;
} aci_set_gather_t;
static int
aci_set_cb_gather( Operation *op, SlapReply *rs )
{
aci_set_gather_t *p = (aci_set_gather_t *)op->o_callback->sc_private;
if ( rs->sr_type == REP_SEARCH ) {
BerValue bvals[ 2 ];
BerVarray bvalsp = NULL;
int j;
for ( j = 0; !BER_BVISNULL( &rs->sr_attrs[ j ].an_name ); j++ ) {
AttributeDescription *desc = rs->sr_attrs[ j ].an_desc;
if ( desc == slap_schema.si_ad_entryDN ) {
bvalsp = bvals;
bvals[ 0 ] = rs->sr_entry->e_nname;
BER_BVZERO( &bvals[ 1 ] );
} else {
Attribute *a;
a = attr_find( rs->sr_entry->e_attrs, desc );
if ( a != NULL ) {
int i;
for ( i = 0; !BER_BVISNULL( &a->a_nvals[ i ] ); i++ )
;
bvalsp = a->a_nvals;
}
}
}
if ( bvals ) {
p->bvals = slap_set_join( p->cookie, p->bvals,
( '|' | SLAP_SET_RREF ), bvalsp );
}
} else {
assert( rs->sr_type == REP_RESULT );
}
return 0;
}
BerVarray
aci_set_gather( SetCookie *cookie, struct berval *name, AttributeDescription *desc )
{
AciSetCookie *cp = (AciSetCookie *)cookie;
int rc = 0;
LDAPURLDesc *ludp = NULL;
Operation op2 = { 0 };
SlapReply rs = {REP_RESULT};
AttributeName anlist[ 2 ], *anlistp = NULL;
int nattrs = 0;
slap_callback cb = { NULL, aci_set_cb_gather, NULL, NULL };
aci_set_gather_t p = { 0 };
const char *text = NULL;
static struct berval defaultFilter_bv = BER_BVC( "(objectClass=*)" );
/* 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 ( strncasecmp( name->bv_val, "ldap:///", STRLENOF( "ldap:///" ) ) != 0 ) {
return aci_set_gather2( cookie, name, desc );
}
rc = ldap_url_parse( name->bv_val, &ludp );
if ( rc != LDAP_URL_SUCCESS ) {
rc = LDAP_PROTOCOL_ERROR;
goto url_done;
}
if ( ( ludp->lud_host && ludp->lud_host[0] ) || ludp->lud_exts )
{
/* host part must be empty */
/* extensions parts must be empty */
rc = LDAP_PROTOCOL_ERROR;
goto url_done;
}
/* Grab the searchbase and see if an appropriate database can be found */
ber_str2bv( ludp->lud_dn, 0, 0, &op2.o_req_dn );
rc = dnNormalize( 0, NULL, NULL, &op2.o_req_dn,
&op2.o_req_ndn, cp->op->o_tmpmemctx );
BER_BVZERO( &op2.o_req_dn );
if ( rc != LDAP_SUCCESS ) {
goto url_done;
}
op2.o_bd = select_backend( &op2.o_req_ndn, 0, 1 );
if ( ( op2.o_bd == NULL ) || ( op2.o_bd->be_search == NULL ) ) {
rc = LDAP_NO_SUCH_OBJECT;
goto url_done;
}
/* Grab the filter */
if ( ludp->lud_filter ) {
ber_str2bv_x( ludp->lud_filter, 0, 0, &op2.ors_filterstr,
cp->op->o_tmpmemctx );
} else {
op2.ors_filterstr = defaultFilter_bv;
}
op2.ors_filter = str2filter_x( cp->op, op2.ors_filterstr.bv_val );
if ( op2.ors_filter == NULL ) {
rc = LDAP_PROTOCOL_ERROR;
goto url_done;
}
/* Grab the scope */
op2.ors_scope = ludp->lud_scope;
/* Grap the attributes */
if ( ludp->lud_attrs ) {
for ( ; ludp->lud_attrs[ nattrs ]; nattrs++ )
;
anlistp = slap_sl_malloc( sizeof( AttributeName ) * ( nattrs + 2 ),
cp->op->o_tmpmemctx );
for ( ; ludp->lud_attrs[ nattrs ]; nattrs++ ) {
ber_str2bv( ludp->lud_attrs[ nattrs ], 0, 0, &anlistp[ nattrs ].an_name );
anlistp[ nattrs ].an_desc = NULL;
rc = slap_bv2ad( &anlistp[ nattrs ].an_name,
&anlistp[ nattrs ].an_desc, &text );
if ( rc != LDAP_SUCCESS ) {
goto url_done;
}
}
} else {
anlistp = anlist;
}
anlistp[ nattrs ].an_name = desc->ad_cname;
anlistp[ nattrs ].an_desc = desc;
BER_BVZERO( &anlistp[ nattrs + 1 ].an_name );
p.cookie = cookie;
op2.o_hdr = cp->op->o_hdr;
op2.o_tag = LDAP_REQ_SEARCH;
op2.o_ndn = op2.o_bd->be_rootndn;
op2.o_callback = &cb;
op2.o_time = slap_get_time();
op2.o_do_not_cache = 1;
op2.o_is_auth_check = 0;
ber_dupbv_x( &op2.o_req_dn, &op2.o_req_ndn, cp->op->o_tmpmemctx );
op2.ors_slimit = SLAP_NO_LIMIT;
op2.ors_tlimit = SLAP_NO_LIMIT;
op2.ors_attrs = anlistp;
op2.ors_attrsonly = 0;
op2.o_private = cp->op->o_private;
cb.sc_private = &p;
rc = op2.o_bd->be_search( &op2, &rs );
if ( rc != 0 ) {
goto url_done;
}
url_done:;
if ( op2.ors_filter ) {
filter_free_x( cp->op, op2.ors_filter );
}
if ( !BER_BVISNULL( &op2.o_req_ndn ) ) {
slap_sl_free( op2.o_req_ndn.bv_val, cp->op->o_tmpmemctx );
}
if ( !BER_BVISNULL( &op2.o_req_dn ) ) {
slap_sl_free( op2.o_req_dn.bv_val, cp->op->o_tmpmemctx );
}
if ( ludp ) {
ldap_free_urldesc( ludp );
}
if ( anlistp && anlistp != anlist ) {
slap_sl_free( anlistp, cp->op->o_tmpmemctx );
}
return p.bvals;
}
BerVarray
aci_set_gather2( SetCookie *cookie, struct berval *name, AttributeDescription *desc )
{
AciSetCookie *cp = (AciSetCookie *)cookie;
BerVarray bvals = NULL;
struct berval ndn;
int rc = 0;
/* 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".
*/
rc = dnNormalize( 0, NULL, NULL, name, &ndn, cp->op->o_tmpmemctx );
if ( rc == LDAP_SUCCESS ) {
if ( desc == slap_schema.si_ad_entryDN ) {
bvals = (BerVarray)slap_sl_malloc( sizeof( BerValue ) * 2,
cp->op->o_tmpmemctx );
bvals[ 0 ] = ndn;
BER_BVZERO( &bvals[ 1 ] );
BER_BVZERO( &ndn );
} else {
backend_attribute( cp->op,
cp->e, &ndn, desc, &bvals, ACL_NONE );
}
if ( !BER_BVISNULL( &ndn ) ) {
slap_sl_free( ndn.bv_val, cp->op->o_tmpmemctx );
}
}
return bvals;
}
static int
aci_match_set (
struct berval *subj,
Operation *op,
Entry *e,
int setref
)
{
struct berval set = BER_BVNULL;
int rc = 0;
AciSetCookie cookie;
if ( setref == 0 ) {
ber_dupbv_x( &set, subj, op->o_tmpmemctx );
} else {
struct berval subjdn, ndn = BER_BVNULL;
struct berval setat;
BerVarray bvals;
const char *text;
AttributeDescription *desc = NULL;
/* format of string is "entry/setAttrName" */
if ( aci_get_part( subj, 0, '/', &subjdn ) < 0 ) {
return 0;
}
if ( aci_get_part( subj, 1, '/', &setat ) < 0 ) {
setat = aci_bv_set_attr;
}
/*
* NOTE: dnNormalize honors the ber_len field
* as the length of the dn to be normalized
*/
if ( slap_bv2ad( &setat, &desc, &text ) == LDAP_SUCCESS ) {
if ( dnNormalize( 0, NULL, NULL, &subjdn, &ndn, op->o_tmpmemctx ) == LDAP_SUCCESS )
{
backend_attribute( op, e, &ndn, desc, &bvals, ACL_NONE );
if ( bvals != NULL && !BER_BVISNULL( &bvals[0] ) ) {
int i;
set = bvals[0];
BER_BVZERO( &bvals[0] );
for ( i = 1; !BER_BVISNULL( &bvals[i] ); i++ )
/* count */ ;
bvals[0].bv_val = bvals[i-1].bv_val;
BER_BVZERO( &bvals[i-1] );
}
ber_bvarray_free_x( bvals, op->o_tmpmemctx );
slap_sl_free( ndn.bv_val, op->o_tmpmemctx );
}
}
}
if ( !BER_BVISNULL( &set ) ) {
cookie.op = op;
cookie.e = e;
rc = ( slap_set_filter( aci_set_gather, (SetCookie *)&cookie, &set,
&op->o_ndn, &e->e_nname, NULL ) > 0 );
slap_sl_free( set.bv_val, op->o_tmpmemctx );
}
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 struct berval *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 (ber_bvstrcasecmp(attr, &bv) == 0)
return(1);
} else if (val == NULL) {
if (ber_bvstrcasecmp(attr, &left) == 0)
return(1);
} else {
if (ber_bvstrcasecmp(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 (ber_bvstrcasecmp(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 struct berval *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 struct berval *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->bv_len == 0
|| ber_bvstrcasecmp( attr, &aci_bv_entry ) == 0) {
attr = &aci_bv_br_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 (ber_bvstrcasecmp( &aci_bv_grant, &actn ) == 0) {
mask = grant;
} else if (ber_bvstrcasecmp( &aci_bv_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, &aci_bv_br_all, NULL);
}
return(found);
}
static int
aci_group_member (
struct berval *subj,
struct berval *defgrpoc,
struct berval *defgrpat,
Operation *op,
Entry *e,
int nmatch,
regmatch_t *matches
)
{
struct berval subjdn;
struct berval grpoc;
struct berval grpat;
ObjectClass *grp_oc = NULL;
AttributeDescription *grp_ad = NULL;
const char *text;
int rc;
/* format of string is "group/objectClassValue/groupAttrName" */
if (aci_get_part(subj, 0, '/', &subjdn) < 0) {
return(0);
}
if (aci_get_part(subj, 1, '/', &grpoc) < 0) {
grpoc = *defgrpoc;
}
if (aci_get_part(subj, 2, '/', &grpat) < 0) {
grpat = *defgrpat;
}
rc = slap_bv2ad( &grpat, &grp_ad, &text );
if( rc != LDAP_SUCCESS ) {
rc = 0;
goto done;
}
rc = 0;
grp_oc = oc_bvfind( &grpoc );
if (grp_oc != NULL && grp_ad != NULL ) {
char buf[ACL_BUF_SIZE];
struct berval bv, ndn;
bv.bv_len = sizeof( buf ) - 1;
bv.bv_val = (char *)&buf;
if ( string_expand(&bv, &subjdn,
e->e_ndn, nmatch, matches) )
{
rc = LDAP_OTHER;
goto done;
}
if ( dnNormalize( 0, NULL, NULL, &bv, &ndn, op->o_tmpmemctx ) == LDAP_SUCCESS ) {
rc = ( backend_group( op, e, &ndn, &op->o_ndn,
grp_oc, grp_ad ) == 0 );
slap_sl_free( ndn.bv_val, op->o_tmpmemctx );
}
}
done:
return(rc);
}
static int
aci_mask(
Operation *op,
Entry *e,
AttributeDescription *desc,
struct berval *val,
struct berval *aci,
int nmatch,
regmatch_t *matches,
slap_access_t *grant,
slap_access_t *deny,
slap_aci_scope_t asserted_scope
)
{
struct berval bv, scope, perms, type, sdn;
int rc;
assert( !BER_BVISNULL( &desc->ad_cname ) );
/* parse an aci of the form:
oid # scope # action;rights;attr;rights;attr
$ action;rights;attr;rights;attr # type # subject
[NOTE: the following comment is very outdated,
as the draft version it refers to (Ando, 2004-11-20)].
See draft-ietf-ldapext-aci-model-04.txt section 9.1 for
a full description of the format for this attribute.
Differences: "this" in the draft is "self" here, and
"self" and "public" is in the position of type.
<scope> = {entry|children|subtree}
<type> = {public|users|access-id|subtree|onelevel|children|
self|dnattr|group|role|set|set-ref}
This routine now supports scope={ENTRY,CHILDREN}
with the semantics:
- ENTRY applies to "entry" and "subtree";
- CHILDREN aplies to "children" and "subtree"
*/
/* 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 matches */
if ( aci_get_part( aci, 1, '#', &scope ) < 0 ) {
return 0;
}
/* note: scope can be either ENTRY or CHILDREN;
* they respectively match "entry" and "children" in bv
* both match "subtree" */
switch ( asserted_scope ) {
case SLAP_ACI_SCOPE_ENTRY:
if ( ber_bvstrcasecmp( &scope, &aci_bv_entry ) != 0
&& ber_bvstrcasecmp( &scope, &aci_bv_subtree ) != 0 )
{
return 0;
}
break;
case SLAP_ACI_SCOPE_CHILDREN:
if ( ber_bvstrcasecmp( &scope, &aci_bv_children ) != 0
&& ber_bvstrcasecmp( &scope, &aci_bv_subtree ) != 0 )
{
return 0;
}
break;
default:
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, &desc->ad_cname, val, grant, deny ) == 0 ) {
return 0;
}
/* see if we have a DN match */
if ( aci_get_part( aci, 3, '#', &type ) < 0 ) {
return 0;
}
/* see if we have a public (i.e. anonymous) access */
if ( ber_bvstrcasecmp( &aci_bv_public, &type ) == 0 ) {
return 1;
}
/* otherwise require an identity */
if ( BER_BVISNULL( &op->o_ndn ) || BER_BVISEMPTY( &op->o_ndn ) ) {
return 0;
}
/* see if we have a users access */
if ( ber_bvstrcasecmp( &aci_bv_users, &type ) == 0 ) {
return 1;
}
/* NOTE: this may fail if a DN contains a valid '#' (unescaped);
* just grab all the berval up to its end (ITS#3303).
* NOTE: the problem could be solved by providing the DN with
* the embedded '#' encoded as hexpairs: "cn=Foo#Bar" would
* become "cn=Foo\23Bar" and be safely used by aci_mask(). */
#if 0
if ( aci_get_part( aci, 4, '#', &sdn ) < 0 ) {
return 0;
}
#endif
sdn.bv_val = type.bv_val + type.bv_len + STRLENOF( "#" );
sdn.bv_len = aci->bv_len - ( sdn.bv_val - aci->bv_val );
if ( ber_bvstrcasecmp( &aci_bv_access_id, &type ) == 0 ) {
struct berval ndn;
rc = dnNormalize( 0, NULL, NULL, &sdn, &ndn, op->o_tmpmemctx );
if ( rc != LDAP_SUCCESS ) {
return 0;
}
if ( dn_match( &op->o_ndn, &ndn ) ) {
rc = 1;
}
slap_sl_free( ndn.bv_val, op->o_tmpmemctx );
return rc;
} else if ( ber_bvstrcasecmp( &aci_bv_subtree, &type ) == 0 ) {
struct berval ndn;
rc = dnNormalize( 0, NULL, NULL, &sdn, &ndn, op->o_tmpmemctx );
if ( rc != LDAP_SUCCESS ) {
return 0;
}
if ( dnIsSuffix( &op->o_ndn, &ndn ) ) {
rc = 1;
}
slap_sl_free( ndn.bv_val, op->o_tmpmemctx );
return rc;
} else if ( ber_bvstrcasecmp( &aci_bv_onelevel, &type ) == 0 ) {
struct berval ndn, pndn;
rc = dnNormalize( 0, NULL, NULL, &sdn, &ndn, op->o_tmpmemctx );
if ( rc != LDAP_SUCCESS ) {
return 0;
}
dnParent( &ndn, &pndn );
if ( dn_match( &op->o_ndn, &pndn ) ) {
rc = 1;
}
slap_sl_free( ndn.bv_val, op->o_tmpmemctx );
return rc;
} else if ( ber_bvstrcasecmp( &aci_bv_children, &type ) == 0 ) {
struct berval ndn;
rc = dnNormalize( 0, NULL, NULL, &sdn, &ndn, op->o_tmpmemctx );
if ( rc != LDAP_SUCCESS ) {
return 0;
}
if ( !dn_match( &op->o_ndn, &ndn )
&& dnIsSuffix( &op->o_ndn, &ndn ) )
{
rc = 1;
}
slap_sl_free( ndn.bv_val, op->o_tmpmemctx );
return rc;
} else if ( ber_bvstrcasecmp( &aci_bv_self, &type ) == 0 ) {
if ( dn_match( &op->o_ndn, &e->e_nname ) ) {
return 1;
}
} else if ( ber_bvstrcasecmp( &aci_bv_dnattr, &type ) == 0 ) {
Attribute *at;
AttributeDescription *ad = NULL;
const char *text;
rc = slap_bv2ad( &sdn, &ad, &text );
if( rc != LDAP_SUCCESS ) {
return 0;
}
rc = 0;
for ( at = attrs_find( e->e_attrs, ad );
at != NULL;
at = attrs_find( at->a_next, ad ) )
{
if ( value_find_ex( ad,
SLAP_MR_ATTRIBUTE_VALUE_NORMALIZED_MATCH |
SLAP_MR_ASSERTED_VALUE_NORMALIZED_MATCH,
at->a_nvals,
&op->o_ndn, op->o_tmpmemctx ) == 0 )
{
rc = 1;
break;
}
}
return rc;
} else if ( ber_bvstrcasecmp( &aci_bv_group, &type ) == 0 ) {
if ( aci_group_member( &sdn, &aci_bv_group_class,
&aci_bv_group_attr, op, e, nmatch, matches ) )
{
return 1;
}
} else if ( ber_bvstrcasecmp( &aci_bv_role, &type ) == 0 ) {
if ( aci_group_member( &sdn, &aci_bv_role_class,
&aci_bv_role_attr, op, e, nmatch, matches ) )
{
return 1;
}
} else if ( ber_bvstrcasecmp( &aci_bv_set, &type ) == 0 ) {
if ( aci_match_set( &sdn, op, e, 0 ) ) {
return 1;
}
} else if ( ber_bvstrcasecmp( &aci_bv_set_ref, &type ) == 0 ) {
if ( aci_match_set( &sdn, op, e, 1 ) ) {
return 1;
}
}
return 0;
}
#ifdef SLAP_DYNACL
/*
* FIXME: there is a silly dependence that makes it difficult
* to move ACIs in a run-time loadable module under the "dynacl"
* umbrella, because sets share some helpers with ACIs.
*/
static int
dynacl_aci_parse( const char *fname, int lineno, slap_style_t sty, const char *right, void **privp )
{
AttributeDescription *ad = NULL;
const char *text = NULL;
if ( sty != ACL_STYLE_REGEX && sty != ACL_STYLE_BASE ) {
fprintf( stderr, "%s: line %d: "
"inappropriate style \"%s\" in \"aci\" by clause\n",
fname, lineno, sty );
return -1;
}
if ( right != NULL && *right != '\0' ) {
if ( slap_str2ad( right, &ad, &text ) != LDAP_SUCCESS ) {
fprintf( stderr,
"%s: line %d: aci \"%s\": %s\n",
fname, lineno, right, text );
return -1;
}
} else {
ad = slap_schema.si_ad_aci;
}
if ( !is_at_syntax( ad->ad_type, SLAPD_ACI_SYNTAX) ) {
fprintf( stderr, "%s: line %d: "
"aci \"%s\": inappropriate syntax: %s\n",
fname, lineno, right,
ad->ad_type->sat_syntax_oid );
return -1;
}
*privp = (void *)ad;
return 0;
}
static int
dynacl_aci_unparse( void *priv, struct berval *bv )
{
AttributeDescription *ad = ( AttributeDescription * )priv;
char *ptr;
assert( ad );
bv->bv_val = ch_malloc( STRLENOF(" aci=") + ad->ad_cname.bv_len + 1 );
ptr = lutil_strcopy( bv->bv_val, " aci=" );
ptr = lutil_strcopy( ptr, ad->ad_cname.bv_val );
bv->bv_len = ptr - bv->bv_val;
return 0;
}
static int
dynacl_aci_mask(
void *priv,
Operation *op,
Entry *e,
AttributeDescription *desc,
struct berval *val,
int nmatch,
regmatch_t *matches,
slap_access_t *grantp,
slap_access_t *denyp )
{
AttributeDescription *ad = ( AttributeDescription * )priv;
Attribute *at;
slap_access_t tgrant, tdeny, grant, deny;
#ifdef LDAP_DEBUG
char accessmaskbuf[ACCESSMASK_MAXLEN];
char accessmaskbuf1[ACCESSMASK_MAXLEN];
#endif /* LDAP_DEBUG */
/* start out with nothing granted, nothing denied */
ACL_INIT(tgrant);
ACL_INIT(tdeny);
/* get the aci attribute */
at = attr_find( e->e_attrs, ad );
if ( at != NULL ) {
int i;
/* the aci is an multi-valued attribute. The
* rights are determined by OR'ing the individual
* rights given by the acis.
*/
for ( i = 0; !BER_BVISNULL( &at->a_nvals[i] ); i++ ) {
if ( aci_mask( op, e, desc, val, &at->a_nvals[i],
nmatch, matches, &grant, &deny,
SLAP_ACI_SCOPE_ENTRY ) != 0 )
{
tgrant |= grant;
tdeny |= deny;
}
}
Debug( LDAP_DEBUG_ACL, "<= aci_mask grant %s deny %s\n",
accessmask2str( tgrant, accessmaskbuf, 1 ),
accessmask2str( tdeny, accessmaskbuf1, 1 ), 0 );
}
/* If the entry level aci didn't contain anything valid for the
* current operation, climb up the tree and evaluate the
* acis with scope set to subtree
*/
if ( tgrant == ACL_PRIV_NONE && tdeny == ACL_PRIV_NONE ) {
struct berval parent_ndn;
#if 1
/* to solve the chicken'n'egg problem of accessing
* the OpenLDAPaci attribute, the direct access
* to the entry's attribute is unchecked; however,
* further accesses to OpenLDAPaci values in the
* ancestors occur through backend_attribute(), i.e.
* with the identity of the operation, requiring
* further access checking. For uniformity, this
* makes further requests occur as the rootdn, if
* any, i.e. searching for the OpenLDAPaci attribute
* is considered an internal search. If this is not
* acceptable, then the same check needs be performed
* when accessing the entry's attribute. */
Operation op2 = *op;
if ( !BER_BVISNULL( &op->o_bd->be_rootndn ) ) {
op2.o_dn = op->o_bd->be_rootdn;
op2.o_ndn = op->o_bd->be_rootndn;
}
#endif
dnParent( &e->e_nname, &parent_ndn );
while ( !BER_BVISEMPTY( &parent_ndn ) ){
int i;
BerVarray bvals = NULL;
int ret, stop;
Debug( LDAP_DEBUG_ACL, "checking ACI of \"%s\"\n", parent_ndn.bv_val, 0, 0 );
ret = backend_attribute( &op2, NULL, &parent_ndn, ad, &bvals, ACL_AUTH );
switch ( ret ) {
case LDAP_SUCCESS :
stop = 0;
if ( !bvals ) {
break;
}
for ( i = 0; !BER_BVISNULL( &bvals[i] ); i++) {
if ( aci_mask( op, e, desc, val,
&bvals[i],
nmatch, matches,
&grant, &deny,
SLAP_ACI_SCOPE_CHILDREN ) != 0 )
{
tgrant |= grant;
tdeny |= deny;
/* evaluation stops as soon as either a "deny" or a
* "grant" directive matches.
*/
if ( tgrant != ACL_PRIV_NONE || tdeny != ACL_PRIV_NONE ) {
stop = 1;
}
}
Debug( LDAP_DEBUG_ACL, "<= aci_mask grant %s deny %s\n",
accessmask2str( tgrant, accessmaskbuf, 1 ),
accessmask2str( tdeny, accessmaskbuf1, 1 ), 0 );
}
break;
case LDAP_NO_SUCH_ATTRIBUTE:
/* just go on if the aci-Attribute is not present in
* the current entry
*/
Debug( LDAP_DEBUG_ACL, "no such attribute\n", 0, 0, 0 );
stop = 0;
break;
case LDAP_NO_SUCH_OBJECT:
/* We have reached the base object */
Debug( LDAP_DEBUG_ACL, "no such object\n", 0, 0, 0 );
stop = 1;
break;
default:
stop = 1;
break;
}
if ( stop ) {
break;
}
dnParent( &parent_ndn, &parent_ndn );
}
}
*grantp = tgrant;
*denyp = tdeny;
return 0;
}
/* need to register this at some point */
static slap_dynacl_t dynacl_aci = {
"aci",
dynacl_aci_parse,
dynacl_aci_unparse,
dynacl_aci_mask,
NULL,
NULL,
NULL
};
#endif /* SLAP_DYNACL */
#endif /* SLAPD_ACI_ENABLED */
#ifdef SLAP_DYNACL
/*
* dynamic ACL infrastructure
*/
static slap_dynacl_t *da_list = NULL;
int
slap_dynacl_register( slap_dynacl_t *da )
{
slap_dynacl_t *tmp;
for ( tmp = da_list; tmp; tmp = tmp->da_next ) {
if ( strcasecmp( da->da_name, tmp->da_name ) == 0 ) {
break;
}
}
if ( tmp != NULL ) {
return -1;
}
if ( da->da_mask == NULL ) {
return -1;
}
da->da_private = NULL;
da->da_next = da_list;
da_list = da;
return 0;
}
static slap_dynacl_t *
slap_dynacl_next( slap_dynacl_t *da )
{
if ( da ) {
return da->da_next;
}
return da_list;
}
slap_dynacl_t *
slap_dynacl_get( const char *name )
{
slap_dynacl_t *da;
for ( da = slap_dynacl_next( NULL ); da; da = slap_dynacl_next( da ) ) {
if ( strcasecmp( da->da_name, name ) == 0 ) {
break;
}
}
return da;
}
#endif /* SLAP_DYNACL */
int
acl_init( void )
{
int i, rc;
#ifdef SLAP_DYNACL
slap_dynacl_t *known_dynacl[] = {
#ifdef SLAPD_ACI_ENABLED
&dynacl_aci,
#endif /* SLAPD_ACI_ENABLED */
NULL
};
for ( i = 0; known_dynacl[ i ]; i++ ) {
rc = slap_dynacl_register( known_dynacl[ i ] );
if ( rc ) {
return rc;
}
}
#endif /* SLAP_DYNACL */
return 0;
}
static int
string_expand(
struct berval *bv,
struct berval *pat,
char *match,
int nmatch,
regmatch_t *matches)
{
ber_len_t size;
char *sp;
char *dp;
int flag;
size = 0;
bv->bv_val[0] = '\0';
bv->bv_len--; /* leave space for lone $ */
flag = 0;
for ( dp = bv->bv_val, sp = pat->bv_val; size < bv->bv_len &&
sp < pat->bv_val + pat->bv_len ; sp++ )
{
/* did we previously see a $ */
if ( flag ) {
if ( flag == 1 && *sp == '$' ) {
*dp++ = '$';
size++;
flag = 0;
} else if ( flag == 1 && *sp == '{' /*'}'*/) {
flag = 2;
} else if ( *sp >= '0' && *sp <= '9' ) {
int n;
int i;
int l;
n = *sp - '0';
if ( flag == 2 ) {
for ( sp++; *sp != '\0' && *sp != /*'{'*/ '}'; sp++ ) {
if ( *sp >= '0' && *sp <= '9' ) {
n = 10*n + ( *sp - '0' );
}
}
if ( *sp != /*'{'*/ '}' ) {
/* FIXME: error */
return 1;
}
}
if ( n >= nmatch ) {
/* FIXME: error */
return 1;
}
*dp = '\0';
i = matches[n].rm_so;
l = matches[n].rm_eo;
for ( ; size < bv->bv_len && i < l; size++, i++ ) {
*dp++ = match[i];
}
*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';
bv->bv_len = size;
Debug( LDAP_DEBUG_TRACE, "=> string_expand: pattern: %.*s\n", (int)pat->bv_len, pat->bv_val, 0 );
Debug( LDAP_DEBUG_TRACE, "=> string_expand: expanded: %s\n", bv->bv_val, 0, 0 );
return 0;
}
static int
regex_matches(
struct berval *pat, /* pattern to expand and match against */
char *str, /* string to match against pattern */
char *buf, /* buffer with $N expansion variables */
int nmatch, /* size of the matches array */
regmatch_t *matches /* offsets in buffer for $N expansion variables */
)
{
regex_t re;
char newbuf[ACL_BUF_SIZE];
struct berval bv;
int rc;
bv.bv_len = sizeof( newbuf ) - 1;
bv.bv_val = newbuf;
if (str == NULL) {
str = "";
};
string_expand( &bv, pat, buf, nmatch, matches );
rc = regcomp( &re, newbuf, REG_EXTENDED|REG_ICASE );
if ( rc ) {
char error[ACL_BUF_SIZE];
regerror( rc, &re, error, sizeof( error ) );
Debug( LDAP_DEBUG_TRACE,
"compile( \"%s\", \"%s\") failed %s\n",
pat->bv_val, 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 );
}
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