openldap/servers/slapd/passwd.c
Howard Chu 4504b48c6b default_passwd_hash now takes a list of schemes
passwordModify exop will generate all the configured hashes
2004-03-02 22:12:23 +00:00

474 lines
11 KiB
C

/* passwd.c - password extended operation routines */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 1998-2004 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>.
*/
#include "portable.h"
#include <stdio.h>
#include <ac/krb.h>
#include <ac/socket.h>
#include <ac/string.h>
#include <ac/unistd.h>
#include "slap.h"
#include <lber_pvt.h>
#include <lutil.h>
static const char *defhash[] = {
#ifdef LUTIL_SHA1_BYTES
"{SSHA}",
#else
"{SMD5}",
#endif
NULL
};
int passwd_extop(
Operation *op,
SlapReply *rs )
{
struct berval id = {0, NULL}, hash, *rsp = NULL;
req_pwdexop_s *qpw = &op->oq_pwdexop;
Modifications *ml;
Operation op2;
slap_callback cb = { NULL, slap_null_cb, NULL, NULL };
slap_callback cb2 = { NULL, slap_replog_cb, NULL, NULL };
cb2.sc_next = &cb;
int i, nhash;
char **hashes;
assert( ber_bvcmp( &slap_EXOP_MODIFY_PASSWD, &op->ore_reqoid ) == 0 );
if( op->o_dn.bv_len == 0 ) {
rs->sr_text = "only authenticated users may change passwords";
return LDAP_STRONG_AUTH_REQUIRED;
}
qpw->rs_old.bv_val = NULL;
qpw->rs_new.bv_val = NULL;
qpw->rs_mods = NULL;
qpw->rs_modtail = NULL;
rs->sr_err = slap_passwd_parse( op->ore_reqdata, &id, &qpw->rs_old,
&qpw->rs_new, &rs->sr_text );
if ( rs->sr_err != LDAP_SUCCESS ) {
return rs->sr_err;
}
if ( id.bv_len ) {
op->o_req_dn = id;
/* ndn is in tmpmem, so we don't need to free it */
rs->sr_err = dnNormalize( 0, NULL, NULL, &id, &op->o_req_ndn, op->o_tmpmemctx );
if ( rs->sr_err != LDAP_SUCCESS ) {
rs->sr_text = "Invalid DN";
return rs->sr_err;
}
op->o_bd = select_backend( &op->o_req_ndn, 0, 0 );
} else {
op->o_req_dn = op->o_dn;
op->o_req_ndn = op->o_ndn;
ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
op->o_bd = op->o_conn->c_authz_backend;
ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
}
if( op->o_bd == NULL ) {
#ifdef HAVE_CYRUS_SASL
return slap_sasl_setpass( op, rs );
#else
rs->sr_text = "no authz backend";
return LDAP_OTHER;
#endif
}
if ( op->o_req_ndn.bv_len == 0 ) {
rs->sr_text = "no password is associated with the Root DSE";
return LDAP_UNWILLING_TO_PERFORM;
}
if (backend_check_restrictions( op, rs,
(struct berval *)&slap_EXOP_MODIFY_PASSWD ) != LDAP_SUCCESS) {
return rs->sr_err;
}
#ifndef SLAPD_MULTIMASTER
/* This does not apply to multi-master case */
if( op->o_bd->be_update_ndn.bv_len ) {
/* we SHOULD return a referral in this case */
BerVarray defref = NULL;
if ( !LDAP_STAILQ_EMPTY( &op->o_bd->be_syncinfo )) {
syncinfo_t *si;
LDAP_STAILQ_FOREACH( si, &op->o_bd->be_syncinfo, si_next ) {
struct berval tmpbv;
ber_dupbv( &tmpbv, &si->si_provideruri_bv[0] );
ber_bvarray_add( &defref, &tmpbv );
}
} else {
defref = referral_rewrite( op->o_bd->be_update_refs,
NULL, NULL, LDAP_SCOPE_DEFAULT );
}
rs->sr_ref = defref;
return LDAP_REFERRAL;
}
#endif /* !SLAPD_MULTIMASTER */
/* generate a new password if none was provided */
if ( qpw->rs_new.bv_len == 0 ) {
slap_passwd_generate( &qpw->rs_new );
if ( qpw->rs_new.bv_len ) {
rsp = slap_passwd_return( &qpw->rs_new );
}
}
if ( qpw->rs_new.bv_len == 0 ) {
rs->sr_text = "password generation failed";
return LDAP_OTHER;
}
/* Give the backend a chance to handle this itself */
if ( op->o_bd->be_extended ) {
rs->sr_err = op->o_bd->be_extended( op, rs );
if ( rs->sr_err != LDAP_UNWILLING_TO_PERFORM &&
rs->sr_err != SLAP_CB_CONTINUE ) {
return rs->sr_err;
}
}
/* The backend didn't handle it, so try it here */
if( op->o_bd && !op->o_bd->be_modify ) {
rs->sr_text = "operation not supported for current user";
return LDAP_UNWILLING_TO_PERFORM;
}
ml = ch_malloc( sizeof(Modifications) );
if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next;
if ( default_passwd_hash ) {
for ( nhash = 0; default_passwd_hash[nhash]; nhash++ );
hashes = default_passwd_hash;
} else {
nhash = 1;
hashes = (char **)defhash;
}
ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) );
for ( i=0; hashes[i]; i++ ) {
slap_passwd_hash( hashes[i], &qpw->rs_new, &hash, &rs->sr_text );
if ( hash.bv_len == 0 ) {
if ( !rs->sr_text ) {
rs->sr_text = "password hash failed";
}
break;
}
ml->sml_values[i] = hash;
}
ml->sml_values[i].bv_val = NULL;
ml->sml_nvalues = NULL;
ml->sml_desc = slap_schema.si_ad_userPassword;
ml->sml_op = LDAP_MOD_REPLACE;
ml->sml_next = qpw->rs_mods;
qpw->rs_mods = ml;
if ( rsp ) {
free( qpw->rs_new.bv_val );
}
if ( hashes[i] ) {
rs->sr_err = LDAP_OTHER;
} else {
op2 = *op;
op2.o_tag = LDAP_REQ_MODIFY;
op2.o_callback = &cb2;
op2.orm_modlist = qpw->rs_mods;
rs->sr_err = slap_mods_opattrs( &op2, ml, qpw->rs_modtail, &rs->sr_text,
NULL, 0 );
if ( rs->sr_err == LDAP_SUCCESS ) {
rs->sr_err = op2.o_bd->be_modify( &op2, rs );
}
if ( rs->sr_err == LDAP_SUCCESS ) {
rs->sr_rspdata = rsp;
} else if ( rsp ) {
ber_bvfree( rsp );
}
}
slap_mods_free( qpw->rs_mods );
return rs->sr_err;
}
int slap_passwd_parse( struct berval *reqdata,
struct berval *id,
struct berval *oldpass,
struct berval *newpass,
const char **text )
{
int rc = LDAP_SUCCESS;
ber_tag_t tag;
ber_len_t len = -1;
BerElementBuffer berbuf;
BerElement *ber = (BerElement *)&berbuf;
if( reqdata == NULL ) {
return LDAP_SUCCESS;
}
if( reqdata->bv_len == 0 ) {
*text = "empty request data field";
return LDAP_PROTOCOL_ERROR;
}
/* ber_init2 uses reqdata directly, doesn't allocate new buffers */
ber_init2( ber, reqdata, 0 );
tag = ber_scanf( ber, "{" /*}*/ );
if( tag == LBER_ERROR ) {
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, ERR,
"slap_passwd_parse: decoding error\n", 0, 0, 0 );
#else
Debug( LDAP_DEBUG_TRACE,
"slap_passwd_parse: decoding error\n", 0, 0, 0 );
#endif
rc = LDAP_PROTOCOL_ERROR;
goto done;
}
tag = ber_peek_tag( ber, &len );
if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) {
if( id == NULL ) {
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, ERR,
"slap_passwd_parse: ID not allowed.\n", 0, 0, 0 );
#else
Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n",
0, 0, 0 );
#endif
*text = "user must change own password";
rc = LDAP_UNWILLING_TO_PERFORM;
goto done;
}
tag = ber_scanf( ber, "m", id );
if( tag == LBER_ERROR ) {
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, ERR,
"slap_passwd_parse: ID parse failed.\n", 0, 0, 0 );
#else
Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
0, 0, 0 );
#endif
goto decoding_error;
}
tag = ber_peek_tag( ber, &len);
}
if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) {
if( oldpass == NULL ) {
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, ERR,
"slap_passwd_parse: OLD not allowed.\n" , 0, 0, 0 );
#else
Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n",
0, 0, 0 );
#endif
*text = "use bind to verify old password";
rc = LDAP_UNWILLING_TO_PERFORM;
goto done;
}
tag = ber_scanf( ber, "m", oldpass );
if( tag == LBER_ERROR ) {
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, ERR,
"slap_passwd_parse: ID parse failed.\n" , 0, 0, 0 );
#else
Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n",
0, 0, 0 );
#endif
goto decoding_error;
}
tag = ber_peek_tag( ber, &len );
}
if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) {
if( newpass == NULL ) {
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, ERR,
"slap_passwd_parse: NEW not allowed.\n", 0, 0, 0 );
#else
Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n",
0, 0, 0 );
#endif
*text = "user specified passwords disallowed";
rc = LDAP_UNWILLING_TO_PERFORM;
goto done;
}
tag = ber_scanf( ber, "m", newpass );
if( tag == LBER_ERROR ) {
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, ERR,
"slap_passwd_parse: OLD parse failed.\n", 0, 0, 0 );
#else
Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n",
0, 0, 0 );
#endif
goto decoding_error;
}
tag = ber_peek_tag( ber, &len );
}
if( len != 0 ) {
decoding_error:
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, ERR,
"slap_passwd_parse: decoding error, len=%ld\n", (long)len, 0, 0 );
#else
Debug( LDAP_DEBUG_TRACE,
"slap_passwd_parse: decoding error, len=%ld\n",
(long) len, 0, 0 );
#endif
*text = "data decoding error";
rc = LDAP_PROTOCOL_ERROR;
}
done:
return rc;
}
struct berval * slap_passwd_return(
struct berval *cred )
{
int rc;
struct berval *bv = NULL;
BerElementBuffer berbuf;
/* opaque structure, size unknown but smaller than berbuf */
BerElement *ber = (BerElement *)&berbuf;
assert( cred != NULL );
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, ENTRY,
"slap_passwd_return: %ld\n",(long)cred->bv_len, 0, 0 );
#else
Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n",
(long) cred->bv_len, 0, 0 );
#endif
ber_init_w_nullc( ber, LBER_USE_DER );
rc = ber_printf( ber, "{tON}",
LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred );
if( rc >= 0 ) {
(void) ber_flatten( ber, &bv );
}
ber_free_buf( ber );
return bv;
}
int
slap_passwd_check(
Connection *conn,
Attribute *a,
struct berval *cred,
const char **text )
{
int result = 1;
struct berval *bv;
#if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
ldap_pvt_thread_mutex_lock( &passwd_mutex );
#ifdef SLAPD_SPASSWD
lutil_passwd_sasl_conn = conn->c_sasl_authctx;
#endif
#endif
for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) {
if( !lutil_passwd( bv, cred, NULL, text ) ) {
result = 0;
break;
}
}
#if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
#ifdef SLAPD_SPASSWD
lutil_passwd_sasl_conn = NULL;
#endif
ldap_pvt_thread_mutex_unlock( &passwd_mutex );
#endif
return result;
}
void
slap_passwd_generate( struct berval *pass )
{
#ifdef NEW_LOGGING
LDAP_LOG( OPERATION, ENTRY, "slap_passwd_generate: begin\n", 0, 0, 0 );
#else
Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 );
#endif
pass->bv_val = NULL;
pass->bv_len = 0;
/*
* generate passwords of only 8 characters as some getpass(3)
* implementations truncate at 8 characters.
*/
lutil_passwd_generate( pass, 8 );
}
void
slap_passwd_hash(
char *hash,
struct berval * cred,
struct berval * new,
const char **text )
{
new->bv_len = 0;
new->bv_val = NULL;
#if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
ldap_pvt_thread_mutex_lock( &passwd_mutex );
#endif
lutil_passwd_hash( cred , hash, new, text );
#if defined( SLAPD_CRYPT ) || defined( SLAPD_SPASSWD )
ldap_pvt_thread_mutex_unlock( &passwd_mutex );
#endif
}