| Current Path : /usr/src/crypto/heimdal/appl/ftp/ftpd/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/crypto/heimdal/appl/ftp/ftpd/gssapi.c |
/*
* Copyright (c) 1998 - 2005 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.
*/
#ifdef FTP_SERVER
#include "ftpd_locl.h"
#else
#include "ftp_locl.h"
#endif
#include <gssapi.h>
#include <krb5_err.h>
RCSID("$Id: gssapi.c 21513 2007-07-12 12:45:25Z lha $");
int ftp_do_gss_bindings = 0;
int ftp_do_gss_delegate = 1;
struct gss_data {
gss_ctx_id_t context_hdl;
char *client_name;
gss_cred_id_t delegated_cred_handle;
void *mech_data;
};
static int
gss_init(void *app_data)
{
struct gss_data *d = app_data;
d->context_hdl = GSS_C_NO_CONTEXT;
d->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
#if defined(FTP_SERVER)
return 0;
#else
/* XXX Check the gss mechanism; with gss_indicate_mechs() ? */
#ifdef KRB5
return !use_kerberos;
#else
return 0;
#endif /* KRB5 */
#endif /* FTP_SERVER */
}
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 (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 *sin4 = (struct sockaddr_in *)sa;
gss_addr->length = 4;
gss_addr->value = &sin4->sin_addr;
*addr_type = GSS_C_AF_INET;
break;
}
default :
errx (1, "unknown address family %d", sa->sa_family);
}
}
/* end common stuff */
#ifdef FTP_SERVER
static int
gss_adat(void *app_data, void *buf, size_t len)
{
char *p = NULL;
gss_buffer_desc input_token, output_token;
OM_uint32 maj_stat, min_stat;
gss_name_t client_name;
struct gss_data *d = app_data;
gss_channel_bindings_t bindings;
if (ftp_do_gss_bindings) {
bindings = malloc(sizeof(*bindings));
if (bindings == NULL)
errx(1, "out of memory");
sockaddr_to_gss_address (his_addr,
&bindings->initiator_addrtype,
&bindings->initiator_address);
sockaddr_to_gss_address (ctrl_addr,
&bindings->acceptor_addrtype,
&bindings->acceptor_address);
bindings->application_data.length = 0;
bindings->application_data.value = NULL;
} else
bindings = GSS_C_NO_CHANNEL_BINDINGS;
input_token.value = buf;
input_token.length = len;
maj_stat = gss_accept_sec_context (&min_stat,
&d->context_hdl,
GSS_C_NO_CREDENTIAL,
&input_token,
bindings,
&client_name,
NULL,
&output_token,
NULL,
NULL,
&d->delegated_cred_handle);
if (bindings != GSS_C_NO_CHANNEL_BINDINGS)
free(bindings);
if(output_token.length) {
if(base64_encode(output_token.value, output_token.length, &p) < 0) {
reply(535, "Out of memory base64-encoding.");
return -1;
}
gss_release_buffer(&min_stat, &output_token);
}
if(maj_stat == GSS_S_COMPLETE){
char *name;
gss_buffer_desc export_name;
gss_OID oid;
maj_stat = gss_display_name(&min_stat, client_name,
&export_name, &oid);
if(maj_stat != 0) {
reply(500, "Error displaying name");
goto out;
}
/* XXX kerberos */
if(oid != GSS_KRB5_NT_PRINCIPAL_NAME) {
reply(500, "OID not kerberos principal name");
gss_release_buffer(&min_stat, &export_name);
goto out;
}
name = malloc(export_name.length + 1);
if(name == NULL) {
reply(500, "Out of memory");
gss_release_buffer(&min_stat, &export_name);
goto out;
}
memcpy(name, export_name.value, export_name.length);
name[export_name.length] = '\0';
gss_release_buffer(&min_stat, &export_name);
d->client_name = name;
if(p)
reply(235, "ADAT=%s", p);
else
reply(235, "ADAT Complete");
sec_complete = 1;
} else if(maj_stat == GSS_S_CONTINUE_NEEDED) {
if(p)
reply(335, "ADAT=%s", p);
else
reply(335, "OK, need more data");
} else {
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);
syslog(LOG_ERR, "gss_accept_sec_context: %s",
(char*)status_string.value);
gss_release_buffer(&new_stat, &status_string);
reply(431, "Security resource unavailable");
}
out:
if (client_name)
gss_release_name(&min_stat, &client_name);
free(p);
return 0;
}
int gss_userok(void*, char*);
int gss_session(void*, char*);
struct sec_server_mech gss_server_mech = {
"GSSAPI",
sizeof(struct gss_data),
gss_init, /* init */
NULL, /* end */
gss_check_prot,
gss_overhead,
gss_encode,
gss_decode,
/* */
NULL,
gss_adat,
NULL, /* pbsz */
NULL, /* ccc */
gss_userok,
gss_session
};
#else /* FTP_SERVER */
extern struct sockaddr *hisctladdr, *myctladdr;
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;
char *str;
name.length = asprintf(&str, "%s@%s", kname, host);
if (str == NULL) {
printf("Out of memory\n");
return AUTH_ERROR;
}
name.value = str;
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);
free(name.value);
gss_release_buffer(&new_stat, &status_string);
return AUTH_ERROR;
}
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;
OM_uint32 mech_flags = GSS_C_MUTUAL_FLAG | GSS_C_SEQUENCE_FLAG;
const char *knames[] = { "ftp", "host", NULL }, **kname = knames;
if(import_name(*kname++, host, &target_name))
return AUTH_ERROR;
input.length = 0;
input.value = NULL;
if (ftp_do_gss_bindings) {
bindings = malloc(sizeof(*bindings));
if (bindings == NULL)
errx(1, "out of memory");
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;
} else
bindings = GSS_C_NO_CHANNEL_BINDINGS;
if (ftp_do_gss_delegate)
mech_flags |= GSS_C_DELEG_FLAG;
while(!context_established) {
maj_stat = gss_init_sec_context(&min_stat,
GSS_C_NO_CREDENTIAL,
&d->context_hdl,
target_name,
GSS_C_NO_OID,
mech_flags,
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;
d->context_hdl = GSS_C_NO_CONTEXT;
gss_release_name(&min_stat, &target_name);
if(*kname != NULL) {
if(import_name(*kname++, host, &target_name)) {
if (bindings != GSS_C_NO_CHANNEL_BINDINGS)
free(bindings);
return AUTH_ERROR;
}
continue;
}
if (bindings != GSS_C_NO_CHANNEL_BINDINGS)
free(bindings);
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;
}
if (input.value) {
free(input.value);
input.value = NULL;
input.length = 0;
}
if (output_token.length != 0) {
base64_encode(output_token.value, output_token.length, &p);
gss_release_buffer(&min_stat, &output_token);
n = command("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(reply_string, "ADAT=");
if(p == NULL){
printf("Error: expected ADAT in reply. got: %s\n",
reply_string);
if (bindings != GSS_C_NO_CHANNEL_BINDINGS)
free(bindings);
return AUTH_ERROR;
} else {
p+=5;
input.value = malloc(strlen(p));
input.length = base64_decode(p, input.value);
}
} else {
if(code != 235) {
printf("Unrecognized response code: %d\n", code);
if (bindings != GSS_C_NO_CHANNEL_BINDINGS)
free(bindings);
return AUTH_ERROR;
}
context_established = 1;
}
}
gss_release_name(&min_stat, &target_name);
if (bindings != GSS_C_NO_CHANNEL_BINDINGS)
free(bindings);
if (input.value)
free(input.value);
{
gss_name_t targ_name;
maj_stat = gss_inquire_context(&min_stat,
d->context_hdl,
NULL,
&targ_name,
NULL,
NULL,
NULL,
NULL,
NULL);
if (GSS_ERROR(maj_stat) == 0) {
gss_buffer_desc name;
maj_stat = gss_display_name (&min_stat,
targ_name,
&name,
NULL);
if (GSS_ERROR(maj_stat) == 0) {
printf("Authenticated to <%s>\n", (char *)name.value);
gss_release_buffer(&min_stat, &name);
}
gss_release_name(&min_stat, &targ_name);
} else
printf("Failed to get gss name of peer.\n");
}
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,
};
#endif /* FTP_SERVER */