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/*
Unix SMB/Netbios implementation.
Version 3.0
ads sasl code
Copyright (C) Andrew Tridgell 2001
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#ifdef HAVE_ADS
#if USE_CYRUS_SASL
/*
this is a minimal interact function, just enough for SASL to talk
GSSAPI/kerberos to W2K
Error handling is a bit of a problem. I can't see how to get Cyrus-sasl
to give sensible errors
*/
static int sasl_interact(LDAP *ld,unsigned flags,void *defaults,void *in)
{
sasl_interact_t *interact = in;
while (interact->id != SASL_CB_LIST_END) {
interact->result = strdup("");
interact->len = strlen(interact->result);
interact++;
}
return LDAP_SUCCESS;
}
#endif
#define MAX_GSS_PASSES 3
/* this performs a SASL/gssapi bind
we avoid using cyrus-sasl to make Samba more robust. cyrus-sasl
is very dependent on correctly configured DNS whereas
this routine is much less fragile
see RFC2078 for details
*/
ADS_STATUS ads_sasl_gssapi_bind(ADS_STRUCT *ads)
{
int minor_status;
gss_name_t serv_name;
gss_buffer_desc input_name;
gss_ctx_id_t context_handle;
gss_OID mech_type = GSS_C_NULL_OID;
gss_buffer_desc output_token, input_token;
OM_uint32 ret_flags, conf_state;
struct berval cred;
struct berval *scred;
int i=0;
int gss_rc, rc;
uint8 *p;
uint32 max_msg_size;
char *sname;
ADS_STATUS status;
krb5_principal principal;
krb5_context ctx;
krb5_enctype enc_types[] = {ENCTYPE_DES_CBC_MD5, ENCTYPE_NULL};
gss_OID_desc nt_principal =
{10, "\052\206\110\206\367\022\001\002\002\002"};
/* we need to fetch a service ticket as the ldap user in the
servers realm, regardless of our realm */
asprintf(&sname, "ldap/%s@%s", ads->ldap_server_name, ads->server_realm);
krb5_init_context(&ctx);
krb5_set_default_tgs_ktypes(ctx, enc_types);
krb5_parse_name(ctx, sname, &principal);
free(sname);
krb5_free_context(ctx);
input_name.value = &principal;
input_name.length = sizeof(principal);
gss_rc = gss_import_name(&minor_status,&input_name,&nt_principal, &serv_name);
if (gss_rc) {
return ADS_ERROR_GSS(gss_rc, minor_status);
}
context_handle = GSS_C_NO_CONTEXT;
input_token.value = NULL;
input_token.length = 0;
for (i=0; i < MAX_GSS_PASSES; i++) {
gss_rc = gss_init_sec_context(&minor_status,
GSS_C_NO_CREDENTIAL,
&context_handle,
serv_name,
mech_type,
GSS_C_MUTUAL_FLAG | GSS_C_REPLAY_FLAG,
0,
NULL,
&input_token,
NULL,
&output_token,
&ret_flags,
NULL);
if (input_token.value) {
gss_release_buffer(&minor_status, &input_token);
}
if (gss_rc && gss_rc != GSS_S_CONTINUE_NEEDED) {
status = ADS_ERROR_GSS(gss_rc, minor_status);
goto failed;
}
cred.bv_val = output_token.value;
cred.bv_len = output_token.length;
rc = ldap_sasl_bind_s(ads->ld, NULL, "GSSAPI", &cred, NULL, NULL,
&scred);
if (rc != LDAP_SASL_BIND_IN_PROGRESS) {
status = ADS_ERROR(rc);
goto failed;
}
if (output_token.value) {
gss_release_buffer(&minor_status, &output_token);
}
if (scred) {
input_token.value = scred->bv_val;
input_token.length = scred->bv_len;
} else {
input_token.value = NULL;
input_token.length = 0;
}
if (gss_rc == 0) break;
}
gss_release_name(&minor_status, &serv_name);
gss_rc = gss_unwrap(&minor_status,context_handle,&input_token,&output_token,
&conf_state,NULL);
if (gss_rc) {
status = ADS_ERROR_GSS(gss_rc, minor_status);
goto failed;
}
gss_release_buffer(&minor_status, &input_token);
p = (uint8 *)output_token.value;
max_msg_size = (p[1]<<16) | (p[2]<<8) | p[3];
gss_release_buffer(&minor_status, &output_token);
output_token.value = malloc(strlen(ads->bind_path) + 8);
p = output_token.value;
*p++ = 1; /* no sign or seal */
/* choose the same size as the server gave us */
*p++ = max_msg_size>>16;
*p++ = max_msg_size>>8;
*p++ = max_msg_size;
snprintf(p, strlen(ads->bind_path)+1, "dn:%s", ads->bind_path);
p += strlen(ads->bind_path);
output_token.length = strlen(ads->bind_path) + 8;
gss_rc = gss_wrap(&minor_status, context_handle,0,GSS_C_QOP_DEFAULT,
&output_token, &conf_state,
&input_token);
if (gss_rc) {
status = ADS_ERROR_GSS(gss_rc, minor_status);
goto failed;
}
free(output_token.value);
cred.bv_val = input_token.value;
cred.bv_len = input_token.length;
rc = ldap_sasl_bind_s(ads->ld, NULL, "GSSAPI", &cred, NULL, NULL,
&scred);
status = ADS_ERROR(rc);
gss_release_buffer(&minor_status, &input_token);
failed:
return status;
}
ADS_STATUS ads_sasl_bind(ADS_STRUCT *ads)
{
#if USE_CYRUS_SASL
int rc;
rc = ldap_sasl_interactive_bind_s(ads->ld, NULL, NULL, NULL, NULL,
LDAP_SASL_QUIET,
sasl_interact, NULL);
return ADS_ERROR(rc);
#else
return ads_sasl_gssapi_bind(ads);
#endif
}
#endif
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