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f8a17bd8bd
(This used to be commit 86f4ca84f2
)
485 lines
12 KiB
C
485 lines
12 KiB
C
/*
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Unix SMB/CIFS implementation.
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ads sasl code
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Copyright (C) Andrew Tridgell 2001
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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#ifdef HAVE_LDAP
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/*
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perform a LDAP/SASL/SPNEGO/NTLMSSP bind (just how many layers can
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we fit on one socket??)
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*/
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static ADS_STATUS ads_sasl_spnego_ntlmssp_bind(ADS_STRUCT *ads)
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{
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DATA_BLOB msg1 = data_blob(NULL, 0);
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DATA_BLOB blob = data_blob(NULL, 0);
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DATA_BLOB blob_in = data_blob(NULL, 0);
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DATA_BLOB blob_out = data_blob(NULL, 0);
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struct berval cred, *scred = NULL;
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int rc;
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NTSTATUS nt_status;
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int turn = 1;
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struct ntlmssp_state *ntlmssp_state;
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if (!NT_STATUS_IS_OK(nt_status = ntlmssp_client_start(&ntlmssp_state))) {
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return ADS_ERROR_NT(nt_status);
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}
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ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SIGN;
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if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_username(ntlmssp_state, ads->auth.user_name))) {
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return ADS_ERROR_NT(nt_status);
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}
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if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_domain(ntlmssp_state, ads->auth.realm))) {
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return ADS_ERROR_NT(nt_status);
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}
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if (!NT_STATUS_IS_OK(nt_status = ntlmssp_set_password(ntlmssp_state, ads->auth.password))) {
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return ADS_ERROR_NT(nt_status);
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}
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blob_in = data_blob(NULL, 0);
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do {
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nt_status = ntlmssp_update(ntlmssp_state,
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blob_in, &blob_out);
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data_blob_free(&blob_in);
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if ((NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
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|| NT_STATUS_IS_OK(nt_status))
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&& blob_out.length) {
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if (turn == 1) {
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/* and wrap it in a SPNEGO wrapper */
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msg1 = gen_negTokenInit(OID_NTLMSSP, blob_out);
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} else {
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/* wrap it in SPNEGO */
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msg1 = spnego_gen_auth(blob_out);
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}
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data_blob_free(&blob_out);
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cred.bv_val = (char *)msg1.data;
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cred.bv_len = msg1.length;
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scred = NULL;
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rc = ldap_sasl_bind_s(ads->ld, NULL, "GSS-SPNEGO", &cred, NULL, NULL, &scred);
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data_blob_free(&msg1);
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if ((rc != LDAP_SASL_BIND_IN_PROGRESS) && (rc != 0)) {
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if (scred) {
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ber_bvfree(scred);
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}
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ntlmssp_end(&ntlmssp_state);
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return ADS_ERROR(rc);
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}
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if (scred) {
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blob = data_blob(scred->bv_val, scred->bv_len);
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ber_bvfree(scred);
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} else {
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blob = data_blob(NULL, 0);
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}
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} else {
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ntlmssp_end(&ntlmssp_state);
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data_blob_free(&blob_out);
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return ADS_ERROR_NT(nt_status);
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}
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if ((turn == 1) &&
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(rc == LDAP_SASL_BIND_IN_PROGRESS)) {
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DATA_BLOB tmp_blob = data_blob(NULL, 0);
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/* the server might give us back two challenges */
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if (!spnego_parse_challenge(blob, &blob_in,
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&tmp_blob)) {
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ntlmssp_end(&ntlmssp_state);
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data_blob_free(&blob);
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DEBUG(3,("Failed to parse challenges\n"));
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return ADS_ERROR_NT(NT_STATUS_INVALID_PARAMETER);
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}
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data_blob_free(&tmp_blob);
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} else if (rc == LDAP_SASL_BIND_IN_PROGRESS) {
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if (!spnego_parse_auth_response(blob, nt_status,
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&blob_in)) {
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ntlmssp_end(&ntlmssp_state);
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data_blob_free(&blob);
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DEBUG(3,("Failed to parse auth response\n"));
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return ADS_ERROR_NT(NT_STATUS_INVALID_PARAMETER);
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}
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}
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data_blob_free(&blob);
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data_blob_free(&blob_out);
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turn++;
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} while (rc == LDAP_SASL_BIND_IN_PROGRESS && !NT_STATUS_IS_OK(nt_status));
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/* we have a reference conter on ntlmssp_state, if we are signing
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then the state will be kept by the signing engine */
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ntlmssp_end(&ntlmssp_state);
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return ADS_ERROR(rc);
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}
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/*
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perform a LDAP/SASL/SPNEGO/KRB5 bind
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*/
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static ADS_STATUS ads_sasl_spnego_krb5_bind(ADS_STRUCT *ads, const char *principal)
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{
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DATA_BLOB blob = data_blob(NULL, 0);
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struct berval cred, *scred = NULL;
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DATA_BLOB session_key = data_blob(NULL, 0);
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int rc;
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rc = spnego_gen_negTokenTarg(principal, ads->auth.time_offset, &blob, &session_key, 0);
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if (rc) {
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return ADS_ERROR_KRB5(rc);
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}
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/* now send the auth packet and we should be done */
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cred.bv_val = (char *)blob.data;
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cred.bv_len = blob.length;
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rc = ldap_sasl_bind_s(ads->ld, NULL, "GSS-SPNEGO", &cred, NULL, NULL, &scred);
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data_blob_free(&blob);
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data_blob_free(&session_key);
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if(scred)
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ber_bvfree(scred);
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return ADS_ERROR(rc);
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}
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/*
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this performs a SASL/SPNEGO bind
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*/
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static ADS_STATUS ads_sasl_spnego_bind(ADS_STRUCT *ads)
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{
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struct berval *scred=NULL;
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int rc, i;
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ADS_STATUS status;
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DATA_BLOB blob;
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char *principal = NULL;
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char *OIDs[ASN1_MAX_OIDS];
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#ifdef HAVE_KRB5
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BOOL got_kerberos_mechanism = False;
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#endif
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rc = ldap_sasl_bind_s(ads->ld, NULL, "GSS-SPNEGO", NULL, NULL, NULL, &scred);
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if (rc != LDAP_SASL_BIND_IN_PROGRESS) {
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status = ADS_ERROR(rc);
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goto failed;
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}
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blob = data_blob(scred->bv_val, scred->bv_len);
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ber_bvfree(scred);
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#if 0
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file_save("sasl_spnego.dat", blob.data, blob.length);
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#endif
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/* the server sent us the first part of the SPNEGO exchange in the negprot
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reply */
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if (!spnego_parse_negTokenInit(blob, OIDs, &principal)) {
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data_blob_free(&blob);
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status = ADS_ERROR(LDAP_OPERATIONS_ERROR);
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goto failed;
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}
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data_blob_free(&blob);
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/* make sure the server understands kerberos */
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for (i=0;OIDs[i];i++) {
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DEBUG(3,("ads_sasl_spnego_bind: got OID=%s\n", OIDs[i]));
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#ifdef HAVE_KRB5
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if (strcmp(OIDs[i], OID_KERBEROS5_OLD) == 0 ||
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strcmp(OIDs[i], OID_KERBEROS5) == 0) {
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got_kerberos_mechanism = True;
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}
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#endif
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free(OIDs[i]);
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}
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DEBUG(3,("ads_sasl_spnego_bind: got server principal name =%s\n", principal));
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#ifdef HAVE_KRB5
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if (!(ads->auth.flags & ADS_AUTH_DISABLE_KERBEROS) &&
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got_kerberos_mechanism) {
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status = ads_sasl_spnego_krb5_bind(ads, principal);
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if (ADS_ERR_OK(status)) {
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SAFE_FREE(principal);
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return status;
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}
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status = ADS_ERROR_KRB5(ads_kinit_password(ads));
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if (ADS_ERR_OK(status)) {
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status = ads_sasl_spnego_krb5_bind(ads, principal);
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}
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/* only fallback to NTLMSSP if allowed */
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if (ADS_ERR_OK(status) ||
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!(ads->auth.flags & ADS_AUTH_ALLOW_NTLMSSP)) {
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SAFE_FREE(principal);
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return status;
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}
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}
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#endif
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SAFE_FREE(principal);
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/* lets do NTLMSSP ... this has the big advantage that we don't need
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to sync clocks, and we don't rely on special versions of the krb5
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library for HMAC_MD4 encryption */
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return ads_sasl_spnego_ntlmssp_bind(ads);
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failed:
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return status;
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}
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#ifdef HAVE_GSSAPI
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#define MAX_GSS_PASSES 3
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/* this performs a SASL/gssapi bind
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we avoid using cyrus-sasl to make Samba more robust. cyrus-sasl
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is very dependent on correctly configured DNS whereas
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this routine is much less fragile
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see RFC2078 and RFC2222 for details
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*/
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static ADS_STATUS ads_sasl_gssapi_bind(ADS_STRUCT *ads)
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{
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uint32 minor_status;
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gss_name_t serv_name;
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gss_buffer_desc input_name;
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gss_ctx_id_t context_handle;
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gss_OID mech_type = GSS_C_NULL_OID;
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gss_buffer_desc output_token, input_token;
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uint32 ret_flags, conf_state;
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struct berval cred;
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struct berval *scred = NULL;
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int i=0;
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int gss_rc, rc;
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uint8 *p;
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uint32 max_msg_size = 0;
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char *sname;
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ADS_STATUS status;
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krb5_principal principal;
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krb5_context ctx = NULL;
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krb5_enctype enc_types[] = {
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#ifdef ENCTYPE_ARCFOUR_HMAC
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ENCTYPE_ARCFOUR_HMAC,
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#endif
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ENCTYPE_DES_CBC_MD5,
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ENCTYPE_NULL};
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gss_OID_desc nt_principal =
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{10, CONST_DISCARD(char *, "\052\206\110\206\367\022\001\002\002\002")};
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/* we need to fetch a service ticket as the ldap user in the
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servers realm, regardless of our realm */
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asprintf(&sname, "ldap/%s@%s", ads->config.ldap_server_name, ads->config.realm);
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initialize_krb5_error_table();
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status = ADS_ERROR_KRB5(krb5_init_context(&ctx));
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if (!ADS_ERR_OK(status)) {
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return status;
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}
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status = ADS_ERROR_KRB5(krb5_set_default_tgs_ktypes(ctx, enc_types));
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if (!ADS_ERR_OK(status)) {
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return status;
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}
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status = ADS_ERROR_KRB5(smb_krb5_parse_name(ctx, sname, &principal));
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if (!ADS_ERR_OK(status)) {
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return status;
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}
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free(sname);
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krb5_free_context(ctx);
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input_name.value = &principal;
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input_name.length = sizeof(principal);
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gss_rc = gss_import_name(&minor_status, &input_name, &nt_principal, &serv_name);
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if (gss_rc) {
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return ADS_ERROR_GSS(gss_rc, minor_status);
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}
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context_handle = GSS_C_NO_CONTEXT;
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input_token.value = NULL;
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input_token.length = 0;
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for (i=0; i < MAX_GSS_PASSES; i++) {
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gss_rc = gss_init_sec_context(&minor_status,
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GSS_C_NO_CREDENTIAL,
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&context_handle,
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serv_name,
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mech_type,
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GSS_C_MUTUAL_FLAG | GSS_C_REPLAY_FLAG,
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0,
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NULL,
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&input_token,
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NULL,
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&output_token,
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&ret_flags,
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NULL);
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if (input_token.value) {
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gss_release_buffer(&minor_status, &input_token);
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}
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if (gss_rc && gss_rc != GSS_S_CONTINUE_NEEDED) {
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status = ADS_ERROR_GSS(gss_rc, minor_status);
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goto failed;
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}
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cred.bv_val = (char *)output_token.value;
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cred.bv_len = output_token.length;
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rc = ldap_sasl_bind_s(ads->ld, NULL, "GSSAPI", &cred, NULL, NULL,
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&scred);
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if (rc != LDAP_SASL_BIND_IN_PROGRESS) {
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status = ADS_ERROR(rc);
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goto failed;
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}
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if (output_token.value) {
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gss_release_buffer(&minor_status, &output_token);
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}
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if (scred) {
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input_token.value = scred->bv_val;
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input_token.length = scred->bv_len;
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} else {
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input_token.value = NULL;
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input_token.length = 0;
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}
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if (gss_rc == 0) break;
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}
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gss_release_name(&minor_status, &serv_name);
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gss_rc = gss_unwrap(&minor_status,context_handle,&input_token,&output_token,
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(int *)&conf_state,NULL);
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if (gss_rc) {
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status = ADS_ERROR_GSS(gss_rc, minor_status);
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goto failed;
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}
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gss_release_buffer(&minor_status, &input_token);
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p = (uint8 *)output_token.value;
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#if 0
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file_save("sasl_gssapi.dat", output_token.value, output_token.length);
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#endif
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if (p) {
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max_msg_size = (p[1]<<16) | (p[2]<<8) | p[3];
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}
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gss_release_buffer(&minor_status, &output_token);
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output_token.value = SMB_MALLOC(strlen(ads->config.bind_path) + 8);
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p = (uint8 *)output_token.value;
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*p++ = 1; /* no sign & seal selection */
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/* choose the same size as the server gave us */
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*p++ = max_msg_size>>16;
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*p++ = max_msg_size>>8;
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*p++ = max_msg_size;
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snprintf((char *)p, strlen(ads->config.bind_path)+4, "dn:%s", ads->config.bind_path);
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p += strlen((const char *)p);
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output_token.length = PTR_DIFF(p, output_token.value);
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gss_rc = gss_wrap(&minor_status, context_handle,0,GSS_C_QOP_DEFAULT,
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&output_token, (int *)&conf_state,
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&input_token);
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if (gss_rc) {
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status = ADS_ERROR_GSS(gss_rc, minor_status);
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goto failed;
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}
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free(output_token.value);
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cred.bv_val = (char *)input_token.value;
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cred.bv_len = input_token.length;
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rc = ldap_sasl_bind_s(ads->ld, NULL, "GSSAPI", &cred, NULL, NULL,
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&scred);
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status = ADS_ERROR(rc);
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gss_release_buffer(&minor_status, &input_token);
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failed:
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if(scred)
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ber_bvfree(scred);
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return status;
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}
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#endif /* HAVE_GGSAPI */
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/* mapping between SASL mechanisms and functions */
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static struct {
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const char *name;
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ADS_STATUS (*fn)(ADS_STRUCT *);
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} sasl_mechanisms[] = {
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{"GSS-SPNEGO", ads_sasl_spnego_bind},
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#ifdef HAVE_GSSAPI
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{"GSSAPI", ads_sasl_gssapi_bind}, /* doesn't work with .NET RC1. No idea why */
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#endif
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{NULL, NULL}
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};
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ADS_STATUS ads_sasl_bind(ADS_STRUCT *ads)
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{
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const char *attrs[] = {"supportedSASLMechanisms", NULL};
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char **values;
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ADS_STATUS status;
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int i, j;
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LDAPMessage *res;
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/* get a list of supported SASL mechanisms */
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status = ads_do_search(ads, "", LDAP_SCOPE_BASE, "(objectclass=*)", attrs, &res);
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if (!ADS_ERR_OK(status)) return status;
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values = ldap_get_values(ads->ld, res, "supportedSASLMechanisms");
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/* try our supported mechanisms in order */
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for (i=0;sasl_mechanisms[i].name;i++) {
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/* see if the server supports it */
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for (j=0;values && values[j];j++) {
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if (strcmp(values[j], sasl_mechanisms[i].name) == 0) {
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DEBUG(4,("Found SASL mechanism %s\n", values[j]));
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status = sasl_mechanisms[i].fn(ads);
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ldap_value_free(values);
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ldap_msgfree(res);
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return status;
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}
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}
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}
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ldap_value_free(values);
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ldap_msgfree(res);
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return ADS_ERROR(LDAP_AUTH_METHOD_NOT_SUPPORTED);
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}
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#endif /* HAVE_LDAP */
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