OpenSolaris_b135/lib/libnsl/nis/gen/nis_misc_proc.c
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* This contains miscellaneous functions moved from commands to the library.
*/
#include "mt.h"
#include <stdlib.h>
#include <stdio.h>
#include <syslog.h>
#include <string.h>
#include <unistd.h>
#include <gssapi/gssapi.h>
#include <rpc/rpc.h>
#include <rpcsvc/nis.h>
#include <rpcsvc/nis_dhext.h>
#include <rpc/auth.h>
#include <rpc/auth_sys.h>
#include <rpc/auth_des.h>
#include <rpc/key_prot.h>
#include <netdir.h>
#include <netconfig.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <dlfcn.h>
#include <gssapi/gssapi.h>
extern int bin2hex(int len, unsigned char *binnum, char *hexnum);
extern int hex2bin(int len, char *hexnum, char *binnum);
#define MECH_LIB_PREFIX1 "/usr/lib/"
#ifdef _LP64
#define MECH_LIB_PREFIX2 "64/"
#else /* _LP64 */
#define MECH_LIB_PREFIX2 ""
#endif /* _LP64 */
#define MECH_LIB_DIR "gss/"
#define MECH_LIB_PREFIX MECH_LIB_PREFIX1 MECH_LIB_PREFIX2
#define MECHDH MECH_LIB_PREFIX MECH_LIB_DIR "mech_dh.so.1"
#define LIBGSS MECH_LIB_PREFIX "libgss.so.1"
static gss_OID_desc __dh_gss_c_nt_netname = {
9, "\053\006\004\001\052\002\032\001\001"
};
mutex_t gss_load_lock = DEFAULTMUTEX;
static gss_OID GSS_EXPORT_NAME = 0;
static gss_OID DH_NETNAME = &__dh_gss_c_nt_netname;
typedef OM_uint32 (*gss_fptr)();
OM_uint32 (*g_import_name)();
OM_uint32 (*g_display_name)();
OM_uint32 (*g_release_name)();
OM_uint32 (*g_release_buffer)();
OM_uint32 (*g_release_oid)();
/*
* gss_OID_load()
*
* This routine is called by __nis_gssprin2netname to define values for
* the gss-api-export-name OID, the Diffie-Hellman netname OID, and
* the gss support routines that it needs.
* The reason for this support routine is that libnsl cannot have an
* explicit dependency on libgss. Callers of __nisgssprin2netname are
* expected to have loaded libgss through the rpcsec layer. The work around
* is to dlopen the needed shared objects and grab the symbols with dlsym.
* This routine opens libgss RTLD_NOLOAD. If this fails then libgss.so.1
* is not loaded and we return error. Otherwise it uses dlsym to
* defines GSS_EXPORT_NAME to have the value of GSS_C_NT_EXPORT_NAME and
* to assign the above fuction pointers.
* If this succeeds then the routine will attempt to load mech_dh.so.1
* and over ride DH_NETNAME with the value of __DH_GSS_C_NT_NETNAME from
* that shared object. We don't consider it an error if this fails because
* its conceivable that another mechanism backend will support the netname
* name type and mech_dh.so.1 not be available.
*
* Return 0 on failer, 1 on success.
*/
static int
gss_OID_load()
{
void *dh;
gss_OID *OIDptr;
int stat = 0;
(void) mutex_lock(&gss_load_lock);
if (GSS_EXPORT_NAME) {
(void) mutex_unlock(&gss_load_lock);
return (0);
}
/* if LIBGSS is not loaded return an error */
if ((dh = dlopen(LIBGSS, RTLD_NOLOAD)) == NULL) {
(void) mutex_unlock(&gss_load_lock);
return (0);
}
OIDptr = (gss_OID *)dlsym(dh, "GSS_C_NT_EXPORT_NAME");
if (OIDptr)
GSS_EXPORT_NAME = *OIDptr;
else
goto Done;
g_import_name = (gss_fptr)dlsym(dh, "gss_import_name");
if (g_import_name == 0)
goto Done;
g_display_name = (gss_fptr)dlsym(dh, "gss_display_name");
if (g_display_name == 0)
goto Done;
g_release_name = (gss_fptr)dlsym(dh, "gss_release_name");
if (g_release_name == 0)
goto Done;
g_release_buffer = (gss_fptr)dlsym(dh, "gss_release_buffer");
if (g_release_buffer == 0)
goto Done;
g_release_oid = (gss_fptr)dlsym(dh, "gss_release_oid");
if (g_release_oid == 0)
goto Done;
stat = 1;
/*
* Try and get the official netname oid from mech_dh.so.
* If this fails will just keep our default from above.
*/
if ((dh = dlopen(MECHDH, RTLD_LAZY)) != NULL) {
OIDptr = (gss_OID *)dlsym(dh, "__DH_GSS_C_NT_NETNAME");
if (OIDptr)
DH_NETNAME = *OIDptr;
}
Done:
(void) mutex_unlock(&gss_load_lock);
if (stat == 0)
GSS_EXPORT_NAME = 0;
return (stat);
}
/*
* int
* __nis_gssprin2netname(rpc_gss_principal_t prin,
* char netname[MAXNETNAMELEN+1])
*
* This routine attempts to extract the netname from an rpc_gss_principal_t
* which is in { gss-api-exorted-name } format. Return 0 if a netname was
* found, else return -1.
*/
/*
* This routine has a dependency on libgss.so. So we will pragma weak
* the interfaces that we need. When this routine is called libgss
* should have been loaded by the rpcsec layer. We will call gss_OID_load
* to get the value for GSS_EXPORT_NAME. If gss_OID_load failes return -1.
*/
#define OID_IS_EQUAL(o1, o2) ((o1) && (o2) && \
((o1)->length == (o2)->length) && \
(memcmp((o1)->elements, (o2)->elements, (o1)->length) == 0))
int
__nis_gssprin2netname(rpc_gss_principal_t prin, char netname[MAXNETNAMELEN+1])
{
gss_buffer_desc display_name;
gss_name_t name;
gss_OID name_type;
gss_buffer_desc expName;
int stat = -1;
OM_uint32 major, minor;
/* See if we already got the OID */
if (GSS_EXPORT_NAME == 0) {
/* Nope. See if GSS is loaded and get the OIDs */
if (!gss_OID_load())
return (-1); /* if libgss.so.1 isn't loaded */
}
expName.length = prin->len;
expName.value = prin->name;
major = (*g_import_name)(&minor, &expName,
(gss_OID) GSS_EXPORT_NAME, &name);
if (major == GSS_S_COMPLETE) {
major = (*g_display_name)(&minor, name,
&display_name, &name_type);
/* We're done with the gss_internal name */
(void) (*g_release_name)(&minor, &name);
if (major == GSS_S_COMPLETE) {
/*
* Check if we've got a netname. If we do we copy it
* and make sure that its null terminated.
*/
if (OID_IS_EQUAL(DH_NETNAME, name_type)) {
(void) strncpy(netname,
(char *)display_name.value,
MAXNETNAMELEN);
netname[MAXNETNAMELEN] = '\0';
stat = 0;
}
/*
* If there are other display formats that can
* be converted to netnames easily, insert here.
*
* else if (OID_IS_EQUAL(OTHER_NT_OID, name_type)) {
* convert2netname(display_name.value, netname);
* } ...
*/
/* Release temporty storage */
(void) (*g_release_buffer)(&minor, &display_name);
(void) (*g_release_oid)(&minor, &name_type);
}
}
if (stat == 0)
return (stat);
return (stat);
}
/*
* Extract a public key given a key length and alg. type from a packed
* netobj containing extended Diffie-Hellman keys.
*/
char *
__nis_dhext_extract_pkey(netobj *no, keylen_t keylen, algtype_t algtype)
{
char *hexkey;
/* LINTED pointer cast */
extdhkey_t *keyent = (extdhkey_t *)no->n_bytes;
/* LINTED pointer cast */
while (keyent < (extdhkey_t *)(no->n_bytes + no->n_len)) {
char *keyoffset;
size_t binlen = (ntohs(keyent->keylen) + 7) / 8;
size_t binpadlen = ((binlen + 3) / 4) * 4;
size_t hexkeylen = binlen * 2 + 1;
if (keylen == ntohs(keyent->keylen) &&
algtype == ntohs(keyent->algtype)) {
if (!(hexkey = malloc(hexkeylen)))
return (NULL);
(void) bin2hex(binlen, keyent->key, hexkey);
return (hexkey);
}
keyoffset = (char *)keyent + (sizeof (ushort_t) * 2) +
binpadlen;
/* LINTED pointer cast */
keyent = (extdhkey_t *)keyoffset;
}
return (NULL);
}