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/*
Unix SMB/CIFS implementation.
ads sasl wrapping code
Copyright (C) Stefan Metzmacher 2007
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#ifdef HAVE_LDAP_SASL_WRAPPING
static int ads_saslwrap_setup(Sockbuf_IO_Desc *sbiod, void *arg)
{
ADS_STRUCT *ads = (ADS_STRUCT *)arg;
ads->ldap.sbiod = sbiod;
sbiod->sbiod_pvt = ads;
return 0;
}
static int ads_saslwrap_remove(Sockbuf_IO_Desc *sbiod)
{
return 0;
}
static ber_slen_t ads_saslwrap_prepare_inbuf(ADS_STRUCT *ads)
{
ads->ldap.in.ofs = 0;
ads->ldap.in.needed = 0;
ads->ldap.in.left = 0;
ads->ldap.in.size = 4 + ads->ldap.in.min;
ads->ldap.in.buf = talloc_array(ads->ldap.mem_ctx,
uint8, ads->ldap.in.size);
if (!ads->ldap.in.buf) {
return -1;
}
return 0;
}
static ber_slen_t ads_saslwrap_grow_inbuf(ADS_STRUCT *ads)
{
if (ads->ldap.in.size == (4 + ads->ldap.in.needed)) {
return 0;
}
ads->ldap.in.size = 4 + ads->ldap.in.needed;
ads->ldap.in.buf = talloc_realloc(ads->ldap.mem_ctx,
ads->ldap.in.buf,
uint8, ads->ldap.in.size);
if (!ads->ldap.in.buf) {
return -1;
}
return 0;
}
static void ads_saslwrap_shrink_inbuf(ADS_STRUCT *ads)
{
talloc_free(ads->ldap.in.buf);
ads->ldap.in.buf = NULL;
ads->ldap.in.size = 0;
ads->ldap.in.ofs = 0;
ads->ldap.in.needed = 0;
ads->ldap.in.left = 0;
}
static ber_slen_t ads_saslwrap_read(Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
{
ADS_STRUCT *ads = (ADS_STRUCT *)sbiod->sbiod_pvt;
ber_slen_t ret;
/* If ofs < 4 it means we don't have read the length header yet */
if (ads->ldap.in.ofs < 4) {
ret = ads_saslwrap_prepare_inbuf(ads);
if (ret < 0) return ret;
ret = LBER_SBIOD_READ_NEXT(sbiod,
ads->ldap.in.buf + ads->ldap.in.ofs,
4 - ads->ldap.in.ofs);
if (ret < 0) return ret;
ads->ldap.in.ofs += ret;
if (ads->ldap.in.ofs < 4) goto eagain;
ads->ldap.in.needed = RIVAL(ads->ldap.in.buf, 4);
if (ads->ldap.in.needed > ads->ldap.in.max) {
errno = EINVAL;
return -1;
}
if (ads->ldap.in.needed < ads->ldap.in.min) {
errno = EINVAL;
return -1;
}
ret = ads_saslwrap_grow_inbuf(ads);
if (ret < 0) return ret;
}
/*
* if there's more data needed from the remote end,
* we need to read more
*/
if (ads->ldap.in.needed > 0) {
ret = LBER_SBIOD_READ_NEXT(sbiod,
ads->ldap.in.buf + ads->ldap.in.ofs,
ads->ldap.in.needed);
if (ret < 0) return ret;
ads->ldap.in.ofs += ret;
ads->ldap.in.needed -= ret;
if (ads->ldap.in.needed > 0) goto eagain;
}
/*
* if we have a complete packet and have not yet unwrapped it
* we need to call the mech specific unwrap() hook
*/
if (ads->ldap.in.needed == 0 && ads->ldap.in.left == 0) {
ADS_STATUS status;
status = ads->ldap.wrap_ops->unwrap(ads);
if (!ADS_ERR_OK(status)) {
errno = EACCES;
return -1;
}
}
/*
* if we have unwrapped data give it to the caller
*/
if (ads->ldap.in.left > 0) {
ret = MIN(ads->ldap.in.left, len);
memcpy(buf, ads->ldap.in.buf + ads->ldap.in.ofs, ret);
ads->ldap.in.ofs += ret;
ads->ldap.in.left -= ret;
/*
* if no more is left shrink the inbuf,
* this will trigger reading a new SASL packet
* from the remote stream in the next call
*/
if (ads->ldap.in.left == 0) {
ads_saslwrap_shrink_inbuf(ads);
}
return ret;
}
/*
* if we don't have anything for the caller yet,
* tell him to ask again
*/
eagain:
errno = EAGAIN;
return -1;
}
static ber_slen_t ads_saslwrap_write(Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
{
return LBER_SBIOD_WRITE_NEXT(sbiod, buf, len);
}
static int ads_saslwrap_ctrl(Sockbuf_IO_Desc *sbiod, int opt, void *arg)
{
return LBER_SBIOD_CTRL_NEXT(sbiod, opt, arg);
}
static int ads_saslwrap_close(Sockbuf_IO_Desc *sbiod)
{
return 0;
}
static const Sockbuf_IO ads_saslwrap_sockbuf_io = {
ads_saslwrap_setup, /* sbi_setup */
ads_saslwrap_remove, /* sbi_remove */
ads_saslwrap_ctrl, /* sbi_ctrl */
ads_saslwrap_read, /* sbi_read */
ads_saslwrap_write, /* sbi_write */
ads_saslwrap_close /* sbi_close */
};
ADS_STATUS ads_setup_sasl_wrapping(ADS_STRUCT *ads)
{
ADS_STATUS status;
Sockbuf *sb;
Sockbuf_IO *io = discard_const_p(Sockbuf_IO, &ads_saslwrap_sockbuf_io);
int rc;
rc = ldap_get_option(ads->ldap.ld, LDAP_OPT_SOCKBUF, &sb);
status = ADS_ERROR_LDAP(rc);
if (!ADS_ERR_OK(status)) {
return status;
}
/* setup the real wrapping callbacks */
rc = ber_sockbuf_add_io(sb, io, LBER_SBIOD_LEVEL_TRANSPORT, ads);
status = ADS_ERROR_LDAP(rc);
if (!ADS_ERR_OK(status)) {
return status;
}
return ADS_SUCCESS;
}
#endif /* HAVE_LDAP_SASL_WRAPPING */
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