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openldap/servers/slapd/bind.c

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/* bind.c - decode an ldap bind operation and pass it to a backend db */
/* $OpenLDAP$ */
/*
* Copyright 1998-2002 The OpenLDAP Foundation, All Rights Reserved.
* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
*/
/*
* 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/string.h>
#include <ac/socket.h>
#include "ldap_pvt.h"
#include "slap.h"
int
do_bind(
Connection *conn,
Operation *op
)
{
BerElement *ber = op->o_ber;
ber_int_t version;
ber_tag_t method;
struct berval mech = { 0, NULL };
struct berval dn = { 0, NULL };
struct berval pdn = { 0, NULL };
struct berval ndn = { 0, NULL };
struct berval edn = { 0, NULL };
ber_tag_t tag;
int rc = LDAP_SUCCESS;
const char *text;
struct berval cred = { 0, NULL };
Backend *be = NULL;
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, ENTRY, "do_bind: conn %d\n", conn->c_connid, 0, 0 );
#else
Debug( LDAP_DEBUG_TRACE, "do_bind\n", 0, 0, 0 );
#endif
/*
* Force to connection to "anonymous" until bind succeeds.
*/
ldap_pvt_thread_mutex_lock( &conn->c_mutex );
if ( conn->c_sasl_bind_in_progress ) be = conn->c_authz_backend;
connection2anonymous( conn );
if ( conn->c_sasl_bind_in_progress ) conn->c_authz_backend = be;
ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
if ( op->o_dn.bv_val != NULL ) {
free( op->o_dn.bv_val );
op->o_dn.bv_val = ch_strdup( "" );
op->o_dn.bv_len = 0;
}
if ( op->o_ndn.bv_val != NULL ) {
free( op->o_ndn.bv_val );
op->o_ndn.bv_val = ch_strdup( "" );
op->o_ndn.bv_len = 0;
}
/*
* Parse the bind request. It looks like this:
*
* BindRequest ::= SEQUENCE {
* version INTEGER, -- version
* name DistinguishedName, -- dn
* authentication CHOICE {
* simple [0] OCTET STRING -- passwd
* krbv42ldap [1] OCTET STRING
* krbv42dsa [2] OCTET STRING
* SASL [3] SaslCredentials
* }
* }
*
* SaslCredentials ::= SEQUENCE {
* mechanism LDAPString,
* credentials OCTET STRING OPTIONAL
* }
*/
tag = ber_scanf( ber, "{imt" /*}*/, &version, &dn, &method );
if ( tag == LBER_ERROR ) {
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, ERR,
"do_bind: conn %d ber_scanf failed\n", conn->c_connid, 0, 0 );
#else
Debug( LDAP_DEBUG_ANY, "bind: ber_scanf failed\n", 0, 0, 0 );
#endif
send_ldap_disconnect( conn, op,
LDAP_PROTOCOL_ERROR, "decoding error" );
rc = -1;
goto cleanup;
}
op->o_protocol = version;
if( method != LDAP_AUTH_SASL ) {
tag = ber_scanf( ber, /*{*/ "m}", &cred );
} else {
tag = ber_scanf( ber, "{o" /*}*/, &mech );
if ( tag != LBER_ERROR ) {
ber_len_t len;
tag = ber_peek_tag( ber, &len );
if ( tag == LDAP_TAG_LDAPCRED ) {
tag = ber_scanf( ber, "m", &cred );
} else {
tag = LDAP_TAG_LDAPCRED;
cred.bv_val = NULL;
cred.bv_len = 0;
}
if ( tag != LBER_ERROR ) {
tag = ber_scanf( ber, /*{{*/ "}}" );
}
}
}
if ( tag == LBER_ERROR ) {
send_ldap_disconnect( conn, op,
LDAP_PROTOCOL_ERROR,
"decoding error" );
rc = SLAPD_DISCONNECT;
goto cleanup;
}
if( (rc = get_ctrls( conn, op, 1 )) != LDAP_SUCCESS ) {
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, INFO,
"do_bind: conn %d get_ctrls failed\n", conn->c_connid, 0, 0 );
#else
Debug( LDAP_DEBUG_ANY, "do_bind: get_ctrls failed\n", 0, 0, 0 );
#endif
goto cleanup;
}
rc = dnPrettyNormal( NULL, &dn, &pdn, &ndn );
if ( rc != LDAP_SUCCESS ) {
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, INFO,
"do_bind: conn %d invalid dn (%s)\n",
conn->c_connid, dn.bv_val, 0 );
#else
Debug( LDAP_DEBUG_ANY, "bind: invalid dn (%s)\n",
dn.bv_val, 0, 0 );
#endif
send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL,
"invalid DN", NULL, NULL );
goto cleanup;
}
if( method == LDAP_AUTH_SASL ) {
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, DETAIL1,
"do_sasl_bind: conn %d dn (%s) mech %s\n",
conn->c_connid, pdn.bv_val, mech.bv_val );
#else
Debug( LDAP_DEBUG_TRACE, "do_sasl_bind: dn (%s) mech %s\n",
pdn.bv_val, mech.bv_val, NULL );
#endif
} else {
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, DETAIL1,
"do_bind: version=%ld dn=\"%s\" method=%ld\n",
(unsigned long) version, pdn.bv_val, (unsigned long)method );
#else
Debug( LDAP_DEBUG_TRACE,
"do_bind: version=%ld dn=\"%s\" method=%ld\n",
(unsigned long) version,
pdn.bv_val, (unsigned long) method );
#endif
}
Statslog( LDAP_DEBUG_STATS, "conn=%lu op=%lu BIND dn=\"%s\" method=%ld\n",
op->o_connid, op->o_opid, pdn.bv_val, (unsigned long) method, 0 );
if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, INFO,
"do_bind: conn %d unknown version = %ld\n",
conn->c_connid, (unsigned long)version, 0 );
#else
Debug( LDAP_DEBUG_ANY, "do_bind: unknown version=%ld\n",
(unsigned long) version, 0, 0 );
#endif
send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
NULL, "requested protocol version not supported", NULL, NULL );
goto cleanup;
} else if (!( global_allows & SLAP_ALLOW_BIND_V2 ) &&
version < LDAP_VERSION3 )
{
send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR,
NULL, "requested protocol version not allowed", NULL, NULL );
goto cleanup;
}
/* we set connection version regardless of whether bind succeeds
* or not.
*/
ldap_pvt_thread_mutex_lock( &conn->c_mutex );
conn->c_protocol = version;
ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
/* check for inappropriate controls */
if( get_manageDSAit( op ) == SLAP_CRITICAL_CONTROL ) {
send_ldap_result( conn, op,
rc = LDAP_UNAVAILABLE_CRITICAL_EXTENSION,
NULL, "manageDSAit control inappropriate",
NULL, NULL );
goto cleanup;
}
/* Set the bindop for the benefit of in-directory SASL lookups */
conn->c_sasl_bindop = op;
if ( method == LDAP_AUTH_SASL ) {
slap_ssf_t ssf = 0;
if ( version < LDAP_VERSION3 ) {
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, INFO,
"do_bind: conn %d sasl with LDAPv%ld\n",
conn->c_connid, (unsigned long)version , 0 );
#else
Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%ld\n",
(unsigned long) version, 0, 0 );
#endif
send_ldap_disconnect( conn, op,
LDAP_PROTOCOL_ERROR, "SASL bind requires LDAPv3" );
rc = SLAPD_DISCONNECT;
goto cleanup;
}
if( mech.bv_len == 0 ) {
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, INFO,
"do_bind: conn %d no SASL mechanism provided\n",
conn->c_connid, 0, 0 );
#else
Debug( LDAP_DEBUG_ANY,
"do_bind: no sasl mechanism provided\n",
0, 0, 0 );
#endif
send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED,
NULL, "no SASL mechanism provided", NULL, NULL );
goto cleanup;
}
/* check restrictions */
rc = backend_check_restrictions( NULL, conn, op, &mech, &text );
if( rc != LDAP_SUCCESS ) {
send_ldap_result( conn, op, rc,
NULL, text, NULL, NULL );
goto cleanup;
}
ldap_pvt_thread_mutex_lock( &conn->c_mutex );
if ( conn->c_sasl_bind_in_progress ) {
if((ber_bvcmp(&conn->c_sasl_bind_mech, &mech) != 0)) {
/* mechanism changed between bind steps */
slap_sasl_reset(conn);
}
} else {
conn->c_sasl_bind_mech = mech;
mech.bv_val = NULL;
mech.bv_len = 0;
}
ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
rc = slap_sasl_bind( conn, op,
&pdn, &ndn,
&cred, &edn, &ssf );
ldap_pvt_thread_mutex_lock( &conn->c_mutex );
if( rc == LDAP_SUCCESS ) {
conn->c_dn = edn;
if( edn.bv_len != 0 ) {
/* edn is always normalized already */
ber_dupbv( &conn->c_ndn, &conn->c_dn );
}
conn->c_authmech = conn->c_sasl_bind_mech;
conn->c_sasl_bind_mech.bv_val = NULL;
conn->c_sasl_bind_mech.bv_len = 0;
conn->c_sasl_bind_in_progress = 0;
conn->c_sasl_ssf = ssf;
if( ssf > conn->c_ssf ) {
conn->c_ssf = ssf;
}
if( conn->c_dn.bv_len != 0 ) {
ber_len_t max = sockbuf_max_incoming_auth;
ber_sockbuf_ctrl( conn->c_sb,
LBER_SB_OPT_SET_MAX_INCOMING, &max );
}
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, DETAIL1,
"do_bind: SASL/%s bind: dn=\"%s\" ssf=%d\n",
conn->c_authmech.bv_val, conn->c_dn.bv_val, ssf );
#else
Debug( LDAP_DEBUG_TRACE,
"do_bind: SASL/%s bind: dn=\"%s\" ssf=%d\n",
conn->c_authmech.bv_val, conn->c_dn.bv_val, ssf );
#endif
} else if ( rc == LDAP_SASL_BIND_IN_PROGRESS ) {
conn->c_sasl_bind_in_progress = 1;
} else {
if ( conn->c_sasl_bind_mech.bv_val ) {
free( conn->c_sasl_bind_mech.bv_val );
conn->c_sasl_bind_mech.bv_val = NULL;
conn->c_sasl_bind_mech.bv_len = 0;
}
conn->c_sasl_bind_in_progress = 0;
}
ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
goto cleanup;
} else {
/* Not SASL, cancel any in-progress bind */
ldap_pvt_thread_mutex_lock( &conn->c_mutex );
if ( conn->c_sasl_bind_mech.bv_val != NULL ) {
free(conn->c_sasl_bind_mech.bv_val);
conn->c_sasl_bind_mech.bv_val = NULL;
conn->c_sasl_bind_mech.bv_len = 0;
}
conn->c_sasl_bind_in_progress = 0;
slap_sasl_reset( conn );
ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
}
if ( method == LDAP_AUTH_SIMPLE ) {
/* accept "anonymous" binds */
if ( cred.bv_len == 0 || ndn.bv_len == 0 ) {
rc = LDAP_SUCCESS;
text = NULL;
if( cred.bv_len &&
!( global_allows & SLAP_ALLOW_BIND_ANON_CRED ))
{
/* cred is not empty, disallow */
rc = LDAP_INVALID_CREDENTIALS;
} else if ( ndn.bv_len &&
!( global_allows & SLAP_ALLOW_BIND_ANON_DN ))
{
/* DN is not empty, disallow */
rc = LDAP_UNWILLING_TO_PERFORM;
text = "unwilling to allow anonymous bind with non-empty DN";
} else if ( global_disallows & SLAP_DISALLOW_BIND_ANON ) {
/* disallow */
rc = LDAP_INAPPROPRIATE_AUTH;
text = "anonymous bind disallowed";
} else {
rc = backend_check_restrictions( NULL, conn, op,
&mech, &text );
}
/*
* we already forced connection to "anonymous",
* just need to send success
*/
send_ldap_result( conn, op, rc,
NULL, text, NULL, NULL );
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, DETAIL1,
"do_bind: conn %d v%d anonymous bind\n",
conn->c_connid, version , 0 );
#else
Debug( LDAP_DEBUG_TRACE, "do_bind: v%d anonymous bind\n",
version, 0, 0 );
#endif
goto cleanup;
} else if ( global_disallows & SLAP_DISALLOW_BIND_SIMPLE ) {
/* disallow simple authentication */
rc = LDAP_UNWILLING_TO_PERFORM;
text = "unwilling to perform simple authentication";
send_ldap_result( conn, op, rc,
NULL, text, NULL, NULL );
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, INFO,
"do_bind: conn %d v%d simple bind(%s) disallowed\n",
conn->c_connid, version, ndn.bv_val );
#else
Debug( LDAP_DEBUG_TRACE,
"do_bind: v%d simple bind(%s) disallowed\n",
version, ndn.bv_val, 0 );
#endif
goto cleanup;
} else if (( global_disallows & SLAP_DISALLOW_BIND_SIMPLE_UNPROTECTED )
&& ( op->o_ssf < global_ssf_set.sss_ssf ))
{
rc = LDAP_CONFIDENTIALITY_REQUIRED;
text = "unwilling to perform simple authentication "
"without confidentilty protection";
send_ldap_result( conn, op, rc,
NULL, text, NULL, NULL );
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, INFO, "do_bind: conn %d "
"v%d unprotected simple bind(%s) disallowed\n",
conn->c_connid, version, ndn.bv_val );
#else
Debug( LDAP_DEBUG_TRACE,
"do_bind: v%d unprotected simple bind(%s) disallowed\n",
version, ndn.bv_val, 0 );
#endif
goto cleanup;
}
#ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_KBIND
} else if ( method == LDAP_AUTH_KRBV41 || method == LDAP_AUTH_KRBV42 ) {
if ( global_disallows & SLAP_DISALLOW_BIND_KRBV4 ) {
/* disallow simple authentication */
rc = LDAP_UNWILLING_TO_PERFORM;
text = "unwilling to perform Kerberos V4 bind";
send_ldap_result( conn, op, rc,
NULL, text, NULL, NULL );
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, DETAIL1,
"do_bind: conn %d v%d Kerberos V4 bind\n",
conn->c_connid, version , 0 );
#else
Debug( LDAP_DEBUG_TRACE, "do_bind: v%d Kerberos V4 bind\n",
version, 0, 0 );
#endif
goto cleanup;
}
#endif
} else {
rc = LDAP_AUTH_METHOD_NOT_SUPPORTED;
text = "unknown authentication method";
send_ldap_result( conn, op, rc,
NULL, text, NULL, NULL );
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, INFO,
"do_bind: conn %ld v%d unknown authentication method (%ld)\n",
conn->c_connid, version, method );
#else
Debug( LDAP_DEBUG_TRACE,
"do_bind: v%d unknown authentication method (%ld)\n",
version, method, 0 );
#endif
goto cleanup;
}
/*
* We could be serving multiple database backends. Select the
* appropriate one, or send a referral to our "referral server"
* if we don't hold it.
*/
if ( (be = select_backend( &ndn, 0, 0 )) == NULL ) {
if ( default_referral ) {
BerVarray ref = referral_rewrite( default_referral,
NULL, &pdn, LDAP_SCOPE_DEFAULT );
send_ldap_result( conn, op, rc = LDAP_REFERRAL,
NULL, NULL, ref ? ref : default_referral, NULL );
ber_bvarray_free( ref );
} else {
/* noSuchObject is not allowed to be returned by bind */
send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS,
NULL, NULL, NULL, NULL );
}
goto cleanup;
}
/* check restrictions */
rc = backend_check_restrictions( be, conn, op, NULL, &text );
if( rc != LDAP_SUCCESS ) {
send_ldap_result( conn, op, rc,
NULL, text, NULL, NULL );
goto cleanup;
}
if ( be->be_bind ) {
int ret;
/* deref suffix alias if appropriate */
suffix_alias( be, &ndn );
ret = (*be->be_bind)( be, conn, op,
&pdn, &ndn, method, &cred, &edn );
if ( ret == 0 ) {
ldap_pvt_thread_mutex_lock( &conn->c_mutex );
if( conn->c_authz_backend == NULL ) {
conn->c_authz_backend = be;
}
if(edn.bv_len) {
conn->c_dn = edn;
} else {
conn->c_dn = pdn;
pdn.bv_val = NULL;
pdn.bv_len = 0;
}
conn->c_ndn = ndn;
ndn.bv_val = NULL;
ndn.bv_len = 0;
if( conn->c_dn.bv_len != 0 ) {
ber_len_t max = sockbuf_max_incoming_auth;
ber_sockbuf_ctrl( conn->c_sb,
LBER_SB_OPT_SET_MAX_INCOMING, &max );
}
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, DETAIL1,
"do_bind: v%d bind: \"%s\" to \"%s\" \n",
version, conn->c_dn.bv_val, conn->c_dn.bv_val );
#else
Debug( LDAP_DEBUG_TRACE,
"do_bind: v%d bind: \"%s\" to \"%s\"\n",
version, dn.bv_val, conn->c_dn.bv_val );
#endif
ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
/* send this here to avoid a race condition */
send_ldap_result( conn, op, LDAP_SUCCESS,
NULL, NULL, NULL, NULL );
} else if (edn.bv_val != NULL) {
free( edn.bv_val );
}
} else {
send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM,
NULL, "operation not supported within namingContext",
NULL, NULL );
}
cleanup:
conn->c_sasl_bindop = NULL;
if( pdn.bv_val != NULL ) {
free( pdn.bv_val );
}
if( ndn.bv_val != NULL ) {
free( ndn.bv_val );
}
if ( mech.bv_val != NULL ) {
free( mech.bv_val );
}
return rc;
}
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