481 lines
12 KiB
C
481 lines
12 KiB
C
/*
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* Copyright (c) 1998 - 2002 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef FTP_SERVER
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#include "ftpd_locl.h"
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#else
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#include "ftp_locl.h"
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#endif
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#include <gssapi.h>
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#include <krb5_err.h>
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RCSID("$Id: gssapi.c,v 1.22 2003/03/16 19:40:18 lha Exp $");
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struct gss_data {
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gss_ctx_id_t context_hdl;
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char *client_name;
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gss_cred_id_t delegated_cred_handle;
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};
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static int
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gss_init(void *app_data)
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{
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struct gss_data *d = app_data;
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d->context_hdl = GSS_C_NO_CONTEXT;
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d->delegated_cred_handle = NULL;
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#if defined(FTP_SERVER)
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return 0;
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#else
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/* XXX Check the gss mechanism; with gss_indicate_mechs() ? */
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#ifdef KRB5
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return !use_kerberos;
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#else
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return 0
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#endif /* KRB5 */
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#endif /* FTP_SERVER */
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}
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static int
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gss_check_prot(void *app_data, int level)
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{
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if(level == prot_confidential)
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return -1;
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return 0;
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}
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static int
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gss_decode(void *app_data, void *buf, int len, int level)
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{
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OM_uint32 maj_stat, min_stat;
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gss_buffer_desc input, output;
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gss_qop_t qop_state;
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int conf_state;
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struct gss_data *d = app_data;
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size_t ret_len;
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input.length = len;
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input.value = buf;
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maj_stat = gss_unwrap (&min_stat,
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d->context_hdl,
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&input,
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&output,
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&conf_state,
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&qop_state);
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if(GSS_ERROR(maj_stat))
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return -1;
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memmove(buf, output.value, output.length);
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ret_len = output.length;
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gss_release_buffer(&min_stat, &output);
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return ret_len;
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}
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static int
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gss_overhead(void *app_data, int level, int len)
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{
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return 100; /* dunno? */
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}
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static int
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gss_encode(void *app_data, void *from, int length, int level, void **to)
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{
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OM_uint32 maj_stat, min_stat;
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gss_buffer_desc input, output;
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int conf_state;
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struct gss_data *d = app_data;
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input.length = length;
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input.value = from;
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maj_stat = gss_wrap (&min_stat,
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d->context_hdl,
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level == prot_private,
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GSS_C_QOP_DEFAULT,
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&input,
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&conf_state,
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&output);
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*to = output.value;
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return output.length;
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}
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static void
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sockaddr_to_gss_address (const struct sockaddr *sa,
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OM_uint32 *addr_type,
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gss_buffer_desc *gss_addr)
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{
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switch (sa->sa_family) {
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#ifdef HAVE_IPV6
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case AF_INET6 : {
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struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
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gss_addr->length = 16;
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gss_addr->value = &sin6->sin6_addr;
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*addr_type = GSS_C_AF_INET6;
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break;
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}
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#endif
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case AF_INET : {
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struct sockaddr_in *sin = (struct sockaddr_in *)sa;
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gss_addr->length = 4;
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gss_addr->value = &sin->sin_addr;
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*addr_type = GSS_C_AF_INET;
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break;
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}
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default :
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errx (1, "unknown address family %d", sa->sa_family);
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}
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}
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/* end common stuff */
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#ifdef FTP_SERVER
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static int
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gss_adat(void *app_data, void *buf, size_t len)
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{
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char *p = NULL;
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gss_buffer_desc input_token, output_token;
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OM_uint32 maj_stat, min_stat;
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gss_name_t client_name;
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struct gss_data *d = app_data;
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struct gss_channel_bindings_struct bindings;
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sockaddr_to_gss_address (his_addr,
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&bindings.initiator_addrtype,
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&bindings.initiator_address);
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sockaddr_to_gss_address (ctrl_addr,
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&bindings.acceptor_addrtype,
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&bindings.acceptor_address);
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bindings.application_data.length = 0;
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bindings.application_data.value = NULL;
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input_token.value = buf;
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input_token.length = len;
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d->delegated_cred_handle = malloc(sizeof(*d->delegated_cred_handle));
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if (d->delegated_cred_handle == NULL) {
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reply(500, "Out of memory");
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goto out;
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}
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memset ((char*)d->delegated_cred_handle, 0,
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sizeof(*d->delegated_cred_handle));
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maj_stat = gss_accept_sec_context (&min_stat,
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&d->context_hdl,
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GSS_C_NO_CREDENTIAL,
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&input_token,
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&bindings,
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&client_name,
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NULL,
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&output_token,
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NULL,
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NULL,
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&d->delegated_cred_handle);
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if(output_token.length) {
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if(base64_encode(output_token.value, output_token.length, &p) < 0) {
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reply(535, "Out of memory base64-encoding.");
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return -1;
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}
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}
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if(maj_stat == GSS_S_COMPLETE){
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char *name;
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gss_buffer_desc export_name;
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gss_OID oid;
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maj_stat = gss_display_name(&min_stat, client_name,
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&export_name, &oid);
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if(maj_stat != 0) {
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reply(500, "Error displaying name");
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goto out;
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}
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/* XXX kerberos */
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if(oid != GSS_KRB5_NT_PRINCIPAL_NAME) {
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reply(500, "OID not kerberos principal name");
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gss_release_buffer(&min_stat, &export_name);
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goto out;
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}
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name = realloc(export_name.value, export_name.length + 1);
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if(name == NULL) {
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reply(500, "Out of memory");
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gss_release_buffer(&min_stat, &export_name);
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goto out;
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}
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name[export_name.length] = '\0';
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gss_release_buffer(&min_stat, &export_name);
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d->client_name = name;
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if(p)
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reply(235, "ADAT=%s", p);
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else
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reply(235, "ADAT Complete");
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sec_complete = 1;
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} else if(maj_stat == GSS_S_CONTINUE_NEEDED) {
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if(p)
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reply(335, "ADAT=%s", p);
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else
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reply(335, "OK, need more data");
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} else {
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OM_uint32 new_stat;
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OM_uint32 msg_ctx = 0;
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gss_buffer_desc status_string;
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gss_display_status(&new_stat,
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min_stat,
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GSS_C_MECH_CODE,
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GSS_C_NO_OID,
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&msg_ctx,
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&status_string);
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syslog(LOG_ERR, "gss_accept_sec_context: %s",
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(char*)status_string.value);
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gss_release_buffer(&new_stat, &status_string);
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reply(431, "Security resource unavailable");
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}
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out:
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free(p);
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return 0;
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}
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int gss_userok(void*, char*);
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struct sec_server_mech gss_server_mech = {
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"GSSAPI",
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sizeof(struct gss_data),
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gss_init, /* init */
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NULL, /* end */
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gss_check_prot,
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gss_overhead,
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gss_encode,
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gss_decode,
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/* */
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NULL,
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gss_adat,
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NULL, /* pbsz */
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NULL, /* ccc */
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gss_userok
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};
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#else /* FTP_SERVER */
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extern struct sockaddr *hisctladdr, *myctladdr;
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static int
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import_name(const char *kname, const char *host, gss_name_t *target_name)
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{
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OM_uint32 maj_stat, min_stat;
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gss_buffer_desc name;
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name.length = asprintf((char**)&name.value, "%s@%s", kname, host);
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if (name.value == NULL) {
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printf("Out of memory\n");
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return AUTH_ERROR;
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}
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maj_stat = gss_import_name(&min_stat,
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&name,
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GSS_C_NT_HOSTBASED_SERVICE,
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target_name);
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if (GSS_ERROR(maj_stat)) {
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OM_uint32 new_stat;
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OM_uint32 msg_ctx = 0;
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gss_buffer_desc status_string;
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gss_display_status(&new_stat,
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min_stat,
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GSS_C_MECH_CODE,
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GSS_C_NO_OID,
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&msg_ctx,
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&status_string);
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printf("Error importing name %s: %s\n",
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(char *)name.value,
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(char *)status_string.value);
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gss_release_buffer(&new_stat, &status_string);
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return AUTH_ERROR;
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}
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free(name.value);
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return 0;
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}
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static int
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gss_auth(void *app_data, char *host)
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{
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OM_uint32 maj_stat, min_stat;
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gss_name_t target_name;
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gss_buffer_desc input, output_token;
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int context_established = 0;
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char *p;
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int n;
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gss_channel_bindings_t bindings;
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struct gss_data *d = app_data;
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const char *knames[] = { "ftp", "host", NULL }, **kname = knames;
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if(import_name(*kname++, host, &target_name))
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return AUTH_ERROR;
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input.length = 0;
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input.value = NULL;
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bindings = malloc(sizeof(*bindings));
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sockaddr_to_gss_address (myctladdr,
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&bindings->initiator_addrtype,
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&bindings->initiator_address);
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sockaddr_to_gss_address (hisctladdr,
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&bindings->acceptor_addrtype,
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&bindings->acceptor_address);
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bindings->application_data.length = 0;
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bindings->application_data.value = NULL;
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while(!context_established) {
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maj_stat = gss_init_sec_context(&min_stat,
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GSS_C_NO_CREDENTIAL,
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&d->context_hdl,
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target_name,
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GSS_C_NO_OID,
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GSS_C_MUTUAL_FLAG | GSS_C_SEQUENCE_FLAG
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| GSS_C_DELEG_FLAG,
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0,
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bindings,
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&input,
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NULL,
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&output_token,
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NULL,
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NULL);
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if (GSS_ERROR(maj_stat)) {
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OM_uint32 new_stat;
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OM_uint32 msg_ctx = 0;
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gss_buffer_desc status_string;
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if(min_stat == KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN && *kname != NULL) {
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if(import_name(*kname++, host, &target_name))
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return AUTH_ERROR;
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continue;
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}
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gss_display_status(&new_stat,
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min_stat,
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GSS_C_MECH_CODE,
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GSS_C_NO_OID,
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&msg_ctx,
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&status_string);
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printf("Error initializing security context: %s\n",
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(char*)status_string.value);
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gss_release_buffer(&new_stat, &status_string);
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return AUTH_CONTINUE;
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}
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gss_release_buffer(&min_stat, &input);
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if (output_token.length != 0) {
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base64_encode(output_token.value, output_token.length, &p);
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gss_release_buffer(&min_stat, &output_token);
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n = command("ADAT %s", p);
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free(p);
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}
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if (GSS_ERROR(maj_stat)) {
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if (d->context_hdl != GSS_C_NO_CONTEXT)
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gss_delete_sec_context (&min_stat,
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&d->context_hdl,
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GSS_C_NO_BUFFER);
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break;
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}
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if (maj_stat & GSS_S_CONTINUE_NEEDED) {
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p = strstr(reply_string, "ADAT=");
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if(p == NULL){
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printf("Error: expected ADAT in reply. got: %s\n",
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reply_string);
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return AUTH_ERROR;
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} else {
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p+=5;
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input.value = malloc(strlen(p));
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input.length = base64_decode(p, input.value);
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}
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} else {
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if(code != 235) {
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printf("Unrecognized response code: %d\n", code);
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return AUTH_ERROR;
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}
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context_established = 1;
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}
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}
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{
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gss_name_t targ_name;
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maj_stat = gss_inquire_context(&min_stat,
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d->context_hdl,
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NULL,
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&targ_name,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL);
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if (GSS_ERROR(maj_stat) == 0) {
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gss_buffer_desc name;
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maj_stat = gss_display_name (&min_stat,
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targ_name,
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&name,
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NULL);
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if (GSS_ERROR(maj_stat) == 0) {
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printf("Authenticated to <%s>\n", (char *)name.value);
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gss_release_buffer(&min_stat, &name);
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}
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gss_release_name(&min_stat, &targ_name);
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} else
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printf("Failed to get gss name of peer.\n");
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}
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return AUTH_OK;
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}
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struct sec_client_mech gss_client_mech = {
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"GSSAPI",
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sizeof(struct gss_data),
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gss_init,
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gss_auth,
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NULL, /* end */
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gss_check_prot,
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gss_overhead,
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gss_encode,
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gss_decode,
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};
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#endif /* FTP_SERVER */
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