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samba-mirror/source3/libads/sasl.c

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/*
Unix SMB/CIFS implementation.
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_LDAP
/*
perform a LDAP/SASL/SPNEGO/NTLMSSP bind (just how many layers can
we fit on one socket??)
*/
static ADS_STATUS ads_sasl_spnego_ntlmssp_bind(ADS_STRUCT *ads)
{
const char *mechs[] = {OID_NTLMSSP, NULL};
DATA_BLOB msg1;
DATA_BLOB blob, chal1, chal2, auth;
uint8 challenge[8];
uint8 nthash[24], lmhash[24], sess_key[16];
uint32 neg_flags;
struct berval cred, *scred;
ADS_STATUS status;
extern pstring global_myname;
int rc;
if (!ads->auth.password) {
/* No password, don't segfault below... */
return ADS_ERROR_NT(NT_STATUS_LOGON_FAILURE);
}
neg_flags = NTLMSSP_NEGOTIATE_UNICODE |
NTLMSSP_NEGOTIATE_128 |
NTLMSSP_NEGOTIATE_NTLM;
memset(sess_key, 0, 16);
/* generate the ntlmssp negotiate packet */
msrpc_gen(&blob, "CddB",
"NTLMSSP",
NTLMSSP_NEGOTIATE,
neg_flags,
sess_key, 16);
/* and wrap it in a SPNEGO wrapper */
msg1 = gen_negTokenTarg(mechs, blob);
data_blob_free(&blob);
cred.bv_val = msg1.data;
cred.bv_len = msg1.length;
rc = ldap_sasl_bind_s(ads->ld, NULL, "GSS-SPNEGO", &cred, NULL, NULL, &scred);
if (rc != LDAP_SASL_BIND_IN_PROGRESS) {
status = ADS_ERROR(rc);
goto failed;
}
blob = data_blob(scred->bv_val, scred->bv_len);
/* the server gives us back two challenges */
if (!spnego_parse_challenge(blob, &chal1, &chal2)) {
DEBUG(3,("Failed to parse challenges\n"));
status = ADS_ERROR(LDAP_OPERATIONS_ERROR);
goto failed;
}
data_blob_free(&blob);
/* encrypt the password with the challenge */
memcpy(challenge, chal1.data + 24, 8);
SMBencrypt(ads->auth.password, challenge,lmhash);
SMBNTencrypt(ads->auth.password, challenge,nthash);
data_blob_free(&chal1);
data_blob_free(&chal2);
/* this generates the actual auth packet */
msrpc_gen(&blob, "CdBBUUUBd",
"NTLMSSP",
NTLMSSP_AUTH,
lmhash, 24,
nthash, 24,
lp_workgroup(),
ads->auth.user_name,
global_myname,
sess_key, 16,
neg_flags);
/* wrap it in SPNEGO */
auth = spnego_gen_auth(blob);
data_blob_free(&blob);
/* now send the auth packet and we should be done */
cred.bv_val = auth.data;
cred.bv_len = auth.length;
rc = ldap_sasl_bind_s(ads->ld, NULL, "GSS-SPNEGO", &cred, NULL, NULL, &scred);
return ADS_ERROR(rc);
failed:
return status;
}
/*
perform a LDAP/SASL/SPNEGO/KRB5 bind
*/
static ADS_STATUS ads_sasl_spnego_krb5_bind(ADS_STRUCT *ads, const char *principal)
{
DATA_BLOB blob;
struct berval cred, *scred;
int rc;
blob = spnego_gen_negTokenTarg(principal, ads->auth.time_offset);
if (!blob.data) {
return ADS_ERROR(LDAP_OPERATIONS_ERROR);
}
/* now send the auth packet and we should be done */
cred.bv_val = blob.data;
cred.bv_len = blob.length;
rc = ldap_sasl_bind_s(ads->ld, NULL, "GSS-SPNEGO", &cred, NULL, NULL, &scred);
data_blob_free(&blob);
return ADS_ERROR(rc);
}
/*
this performs a SASL/SPNEGO bind
*/
static ADS_STATUS ads_sasl_spnego_bind(ADS_STRUCT *ads)
{
struct berval *scred=NULL;
int rc, i;
ADS_STATUS status;
DATA_BLOB blob;
char *principal;
char *OIDs[ASN1_MAX_OIDS];
BOOL got_kerberos_mechanism = False;
rc = ldap_sasl_bind_s(ads->ld, NULL, "GSS-SPNEGO", NULL, NULL, NULL, &scred);
if (rc != LDAP_SASL_BIND_IN_PROGRESS) {
status = ADS_ERROR(rc);
goto failed;
}
blob = data_blob(scred->bv_val, scred->bv_len);
#if 0
file_save("sasl_spnego.dat", blob.data, blob.length);
#endif
/* the server sent us the first part of the SPNEGO exchange in the negprot
reply */
if (!spnego_parse_negTokenInit(blob, OIDs, &principal)) {
data_blob_free(&blob);
status = ADS_ERROR(LDAP_OPERATIONS_ERROR);
goto failed;
}
data_blob_free(&blob);
/* make sure the server understands kerberos */
for (i=0;OIDs[i];i++) {
DEBUG(3,("got OID=%s\n", OIDs[i]));
if (strcmp(OIDs[i], OID_KERBEROS5_OLD) == 0 ||
strcmp(OIDs[i], OID_KERBEROS5) == 0) {
got_kerberos_mechanism = True;
}
free(OIDs[i]);
}
DEBUG(3,("got principal=%s\n", principal));
#ifdef HAVE_KRB5
if (!(ads->auth.flags & ADS_AUTH_DISABLE_KERBEROS) &&
got_kerberos_mechanism && ads_kinit_password(ads) == 0) {
return ads_sasl_spnego_krb5_bind(ads, principal);
}
#endif
/* lets do NTLMSSP ... this has the big advantage that we don't need
to sync clocks, and we don't rely on special versions of the krb5
library for HMAC_MD4 encryption */
return ads_sasl_spnego_ntlmssp_bind(ads);
failed:
return status;
}
#ifdef HAVE_GSSAPI
#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 and RFC2222 for details
*/
static 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;
unsigned sec_layer;
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->config.ldap_server_name, ads->config.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;
file_save("sasl_gssapi.dat", output_token.value, output_token.length);
max_msg_size = (p[1]<<16) | (p[2]<<8) | p[3];
sec_layer = *p;
gss_release_buffer(&minor_status, &output_token);
output_token.value = malloc(strlen(ads->config.bind_path) + 8);
p = output_token.value;
*p++ = 1; /* no sign & seal selection */
/* 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->config.bind_path)+4, "dn:%s", ads->config.bind_path);
p += strlen(p);
output_token.length = PTR_DIFF(p, output_token.value);
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;
}
#endif
/* mapping between SASL mechanisms and functions */
static struct {
const char *name;
ADS_STATUS (*fn)(ADS_STRUCT *);
} sasl_mechanisms[] = {
{"GSS-SPNEGO", ads_sasl_spnego_bind},
#ifdef HAVE_GSSAPI
{"GSSAPI", ads_sasl_gssapi_bind}, /* doesn't work with .NET RC1. No idea why */
#endif
{NULL, NULL}
};
ADS_STATUS ads_sasl_bind(ADS_STRUCT *ads)
{
const char *attrs[] = {"supportedSASLMechanisms", NULL};
char **values;
ADS_STATUS status;
int i, j;
void *res;
/* get a list of supported SASL mechanisms */
status = ads_do_search(ads, "", LDAP_SCOPE_BASE, "(objectclass=*)", attrs, &res);
if (!ADS_ERR_OK(status)) return status;
values = ldap_get_values(ads->ld, res, "supportedSASLMechanisms");
/* try our supported mechanisms in order */
for (i=0;sasl_mechanisms[i].name;i++) {
/* see if the server supports it */
for (j=0;values && values[j];j++) {
if (strcmp(values[j], sasl_mechanisms[i].name) == 0) {
DEBUG(4,("Found SASL mechanism %s\n", values[j]));
status = sasl_mechanisms[i].fn(ads);
ldap_value_free(values);
ldap_msgfree(res);
return status;
}
}
}
ldap_value_free(values);
ldap_msgfree(res);
return ADS_ERROR(LDAP_AUTH_METHOD_NOT_SUPPORTED);
}
#endif