/* -*- tab-width: 8; -*-
* Copyright (c) 1998 - 2002 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "syshdr.h"
#include "ftp.h"
#include "base64.h"
#if defined(HAVE_GSSAPI_H)
# include <gssapi.h>
/* if we have gssapi.h (not gssapi/gssapi.h) we assume we link
* against Heimdal, which needs krb5_err.h to define *
* KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN
*/
# include <krb5_err.h>
#elif defined(HAVE_GSSAPI_GSSAPI_H)
# include <gssapi/gssapi.h>
/* if we have gssapi/gssapi.h it might be safe to assume we have the
* other two that are part of MIT's krb5 as well, but this will work
* even if they one day do away with one of those two header files.
*/
# if defined(HAVE_GSSAPI_GSSAPI_KRB5_H)
# include <gssapi/gssapi_krb5.h>
# endif
#else
# error "Need gssapi.h from either Heimdal or MIT krb5"
#endif
/*
* The implementation must reserve static storage for a
* gss_OID_desc object containing the value
* {10, (void *)"\x2a\x86\x48\x86\xf7\x12"
* "\x01\x02\x01\x04"}, corresponding to an
* object-identifier value of {iso(1) member-body(2)
* Unites States(840) mit(113554) infosys(1) gssapi(2)
* generic(1) service_name(4)}. The constant
* GSS_C_NT_HOSTBASED_SERVICE should be initialized
* to point to that gss_OID_desc.
*/
static gss_OID_desc gss_c_nt_hostbased_service_oid_desc =
{10, (void *)"\x2a\x86\x48\x86\xf7\x12" "\x01\x02\x01\x04"};
static gss_OID GSS_C_NT_HOSTBASED_SERVICE = &gss_c_nt_hostbased_service_oid_desc;
/*RCSID("$Id: gssapi.c,v 1.5 2002/12/05 22:12:36 mhe Exp $");*/
struct gss_data {
gss_ctx_id_t context_hdl;
char *client_name;
gss_cred_id_t delegated_cred_handle;
};
static int
gss_init(void *app_data)
{
struct gss_data *d = app_data;
d->context_hdl = GSS_C_NO_CONTEXT;
d->delegated_cred_handle = NULL;
return 0;
}
static int
gss_check_prot(void *app_data, int level)
{
if(level == prot_confidential)
return -1;
return 0;
}
static int
gss_decode(void *app_data, void *buf, int len, int level)
{
OM_uint32 maj_stat, min_stat;
gss_buffer_desc input, output;
gss_qop_t qop_state;
int conf_state;
struct gss_data *d = app_data;
size_t ret_len;
input.length = len;
input.value = buf;
maj_stat = gss_unwrap (&min_stat,
d->context_hdl,
&input,
&output,
&conf_state,
&qop_state);
if(GSS_ERROR(maj_stat))
return -1;
memmove(buf, output.value, output.length);
ret_len = output.length;
gss_release_buffer(&min_stat, &output);
return ret_len;
}
static int
gss_overhead(void *app_data, int level, int len)
{
return 100; /* dunno? */
}
static int
gss_encode(void *app_data, void *from, int length, int level, void **to)
{
OM_uint32 maj_stat, min_stat;
gss_buffer_desc input, output;
int conf_state;
struct gss_data *d = app_data;
input.length = length;
input.value = from;
maj_stat = gss_wrap (&min_stat,
d->context_hdl,
level == prot_private,
GSS_C_QOP_DEFAULT,
&input,
&conf_state,
&output);
*to = output.value;
return output.length;
}
static void
sockaddr_to_gss_address (const struct sockaddr *sa,
OM_uint32 *addr_type,
gss_buffer_desc *gss_addr)
{
switch (sa->sa_family) {
#ifdef HAVE_IPV6
case AF_INET6 : {
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
gss_addr->length = 16;
gss_addr->value = &sin6->sin6_addr;
*addr_type = GSS_C_AF_INET6;
break;
}
#endif
case AF_INET : {
struct sockaddr_in *sin = (struct sockaddr_in *)sa;
gss_addr->length = 4;
gss_addr->value = &sin->sin_addr;
*addr_type = GSS_C_AF_INET;
break;
}
default :
ftp_err("unknown address family %d", sa->sa_family);
}
}
/*extern struct sockaddr *hisctladdr, *myctladdr;*/
#define myctladdr ((struct sockaddr *)&ftp->ctrl->local_addr)
#define hisctladdr ((struct sockaddr *)&ftp->ctrl->remote_addr)
static int
import_name(const char *kname, const char *host, gss_name_t *target_name)
{
OM_uint32 maj_stat, min_stat;
gss_buffer_desc name;
name.length = asprintf((char**)&name.value, "%s@%s", kname, host);
if (name.value == NULL) {
printf("Out of memory\n");
return AUTH_ERROR;
}
maj_stat = gss_import_name(&min_stat,
&name,
GSS_C_NT_HOSTBASED_SERVICE,
target_name);
if (GSS_ERROR(maj_stat)) {
OM_uint32 new_stat;
OM_uint32 msg_ctx = 0;
gss_buffer_desc status_string;
gss_display_status(&new_stat,
min_stat,
GSS_C_MECH_CODE,
GSS_C_NO_OID,
&msg_ctx,
&status_string);
printf("Error importing name %s: %s\n",
(char *)name.value,
(char *)status_string.value);
gss_release_buffer(&new_stat, &status_string);
return AUTH_ERROR;
} else {
void (*tracefunq)(const char *fmt, ...);
tracefunq = (ftp->verbosity == vbDebug ? ftp_err : ftp_trace);
tracefunq("Trying to authenticate to <%s>\n", (char *)name.value);
}
free(name.value);
return 0;
}
static int
gss_auth(void *app_data, char *host)
{
OM_uint32 maj_stat, min_stat;
gss_name_t target_name;
gss_buffer_desc input, output_token;
int context_established = 0;
char *p;
int n;
gss_channel_bindings_t bindings;
struct gss_data *d = app_data;
const char *knames[] = { "ftp", "host", NULL }, **kname = knames;
if(import_name(*kname++, host, &target_name))
return AUTH_ERROR;
input.length = 0;
input.value = NULL;
bindings = malloc(sizeof(*bindings));
sockaddr_to_gss_address (myctladdr,
&bindings->initiator_addrtype,
&bindings->initiator_address);
sockaddr_to_gss_address (hisctladdr,
&bindings->acceptor_addrtype,
&bindings->acceptor_address);
bindings->application_data.length = 0;
bindings->application_data.value = NULL;
while(!context_established) {
maj_stat = gss_init_sec_context(&min_stat,
GSS_C_NO_CREDENTIAL,
&d->context_hdl,
target_name,
GSS_C_NO_OID,
GSS_C_MUTUAL_FLAG | GSS_C_SEQUENCE_FLAG
| GSS_C_DELEG_FLAG,
0,
bindings,
&input,
NULL,
&output_token,
NULL,
NULL);
if (GSS_ERROR(maj_stat)) {
OM_uint32 new_stat;
OM_uint32 msg_ctx = 0;
gss_buffer_desc status_string;
if(min_stat == KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN && *kname != NULL) {
if(import_name(*kname++, host, &target_name))
return AUTH_ERROR;
continue;
}
gss_display_status(&new_stat,
min_stat,
GSS_C_MECH_CODE,
GSS_C_NO_OID,
&msg_ctx,
&status_string);
printf("Error initializing security context: %s\n",
(char*)status_string.value);
gss_release_buffer(&new_stat, &status_string);
return AUTH_CONTINUE;
}
gss_release_buffer(&min_stat, &input);
if (output_token.length != 0) {
base64_encode(output_token.value, output_token.length, &p);
gss_release_buffer(&min_stat, &output_token);
n = ftp_cmd("ADAT %s", p);
free(p);
}
if (GSS_ERROR(maj_stat)) {
if (d->context_hdl != GSS_C_NO_CONTEXT)
gss_delete_sec_context (&min_stat,
&d->context_hdl,
GSS_C_NO_BUFFER);
break;
}
if (maj_stat & GSS_S_CONTINUE_NEEDED) {
p = strstr(ftp->reply, "ADAT=");
if(p == NULL){
printf("Error: expected ADAT in reply. got: %s\n",
ftp->reply);
return AUTH_ERROR;
} else {
p+=5;
input.value = malloc(strlen(p));
input.length = base64_decode(p, input.value);
}
} else {
if(ftp->fullcode != 235) {
printf("Unrecognized response code: %d\n", ftp->fullcode);
return AUTH_ERROR;
}
context_established = 1;
}
}
return AUTH_OK;
}
struct sec_client_mech gss_client_mech = {
"GSSAPI",
sizeof(struct gss_data),
gss_init,
gss_auth,
NULL, /* end */
gss_check_prot,
gss_overhead,
gss_encode,
gss_decode,
};
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