/*
* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
* unrestricted use provided that this legend is included on all tape
* media and as a part of the software program in whole or part. Users
* may copy or modify Sun RPC without charge, but are not authorized
* to license or distribute it to anyone else except as part of a product or
* program developed by the user.
*
* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
*
* Sun RPC is provided with no support and without any obligation on the
* part of Sun Microsystems, Inc. to assist in its use, correction,
* modification or enhancement.
*
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
* OR ANY PART THEREOF.
*
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
* or profits or other special, indirect and consequential damages, even if
* Sun has been advised of the possibility of such damages.
*
* Sun Microsystems, Inc.
* 2550 Garcia Avenue
* Mountain View, California 94043
*/
#if defined(LIBC_SCCS) && !defined(lint)
/*static char *sccsid = "from: @(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro";*/
/*static char *sccsid = "from: @(#)auth_unix.c 2.2 88/08/01 4.0 RPCSRC";*/
static char *rcsid = "$FreeBSD: src/lib/libc/rpc/auth_unix.c,v 1.12 1999/12/29 05:04:16 peter Exp $";
#endif
/*
* auth_unix.c, Implements UNIX style authentication parameters.
*
* Copyright (C) 1984, Sun Microsystems, Inc.
*
* The system is very weak. The client uses no encryption for it's
* credentials and only sends null verifiers. The server sends backs
* null verifiers or optionally a verifier that suggests a new short hand
* for the credentials.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/param.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
#include <rpc/auth.h>
#include <rpc/auth_unix.h>
/*
* Unix authenticator operations vector
*/
static void authunix_nextverf(AUTH*);
static bool_t authunix_marshal(AUTH*, XDR*);
static bool_t authunix_validate(AUTH*, struct opaque_auth *);
static bool_t authunix_refresh(AUTH*);
static void authunix_destroy(AUTH*);
static struct auth_ops auth_unix_ops = {
authunix_nextverf,
authunix_marshal,
authunix_validate,
authunix_refresh,
authunix_destroy
};
/*
* This struct is pointed to by the ah_private field of an auth_handle.
*/
struct audata {
struct opaque_auth au_origcred; /* original credentials */
struct opaque_auth au_shcred; /* short hand cred */
u_long au_shfaults; /* short hand cache faults */
char au_marshed[MAX_AUTH_BYTES];
u_int au_mpos; /* xdr pos at end of marshed */
};
#define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private)
static void marshal_new_auth();
/*
* This goop is here because some servers refuse to accept a
* credential with more than some number (usually 8) supplementary
* groups. Blargh!
*/
static int authunix_maxgrouplist = 0;
void
set_rpc_maxgrouplist(int num)
{
authunix_maxgrouplist = num;
}
/*
* Create a unix style authenticator.
* Returns an auth handle with the given stuff in it.
*/
AUTH *
authunix_create(machname, uid, gid, len, aup_gids)
char *machname;
int uid;
int gid;
int len;
int *aup_gids;
{
struct authunix_parms aup;
char mymem[MAX_AUTH_BYTES];
struct timeval now;
XDR xdrs;
register AUTH *auth;
register struct audata *au;
/*
* Allocate and set up auth handle
*/
auth = (AUTH *)mem_alloc(sizeof(*auth));
#ifndef _KERNEL
if (auth == NULL) {
(void)fprintf(stderr, "authunix_create: out of memory\n");
return (NULL);
}
#endif
au = (struct audata *)mem_alloc(sizeof(*au));
#ifndef _KERNEL
if (au == NULL) {
(void)fprintf(stderr, "authunix_create: out of memory\n");
return (NULL);
}
#endif
auth->ah_ops = &auth_unix_ops;
auth->ah_private = (caddr_t)au;
auth->ah_verf = au->au_shcred = _null_auth;
au->au_shfaults = 0;
/*
* fill in param struct from the given params
*/
(void)gettimeofday(&now, (struct timezone *)0);
aup.aup_time = now.tv_sec;
aup.aup_machname = machname;
aup.aup_uid = uid;
aup.aup_gid = gid;
/* GW: continuation of max group list hack */
if(authunix_maxgrouplist != 0) {
aup.aup_len = ((len < authunix_maxgrouplist) ? len
: authunix_maxgrouplist);
} else {
aup.aup_len = (u_int)len;
}
aup.aup_gids = aup_gids;
/*
* Serialize the parameters into origcred
*/
xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE);
if (! xdr_authunix_parms(&xdrs, &aup))
abort();
au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs);
au->au_origcred.oa_flavor = AUTH_UNIX;
#ifdef _KERNEL
au->au_origcred.oa_base = mem_alloc((u_int) len);
#else
if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) {
(void)fprintf(stderr, "authunix_create: out of memory\n");
return (NULL);
}
#endif
memcpy(au->au_origcred.oa_base, mymem, (u_int)len);
/*
* set auth handle to reflect new cred.
*/
auth->ah_cred = au->au_origcred;
marshal_new_auth(auth);
return (auth);
}
/*
* Returns an auth handle with parameters determined by doing lots of
* syscalls.
*/
AUTH *
authunix_create_default()
{
register int len;
char machname[MAX_MACHINE_NAME + 1];
register int uid;
register int gid;
int gids[NGRPS];
int i;
gid_t real_gids[NGROUPS];
if (gethostname(machname, MAX_MACHINE_NAME) == -1)
abort();
machname[MAX_MACHINE_NAME] = 0;
uid = (int)geteuid();
gid = (int)getegid();
if ((len = getgroups(NGROUPS, real_gids)) < 0)
abort();
if(len > NGRPS) len = NGRPS; /* GW: turn `gid_t's into `int's */
for(i = 0; i < len; i++) {
gids[i] = (int)real_gids[i];
}
return (authunix_create(machname, uid, gid, len, gids));
}
/*
* authunix operations
*/
static void
authunix_nextverf(AUTH *auth)
{
/* no action necessary */
}
static bool_t
authunix_marshal(AUTH *auth, XDR *xdrs)
{
struct audata *au = AUTH_PRIVATE(auth);
return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos));
}
static bool_t
authunix_validate( AUTH *auth, struct opaque_auth *verf )
{
register struct audata *au;
XDR xdrs;
if (verf->oa_flavor == AUTH_SHORT) {
au = AUTH_PRIVATE(auth);
xdrmem_create(&xdrs, verf->oa_base, verf->oa_length, XDR_DECODE);
if (au->au_shcred.oa_base != NULL) {
mem_free(au->au_shcred.oa_base,
au->au_shcred.oa_length);
au->au_shcred.oa_base = NULL;
}
if (xdr_opaque_auth(&xdrs, &au->au_shcred)) {
auth->ah_cred = au->au_shcred;
} else {
xdrs.x_op = XDR_FREE;
(void)xdr_opaque_auth(&xdrs, &au->au_shcred);
au->au_shcred.oa_base = NULL;
auth->ah_cred = au->au_origcred;
}
marshal_new_auth(auth);
}
return (TRUE);
}
static bool_t
authunix_refresh(AUTH *auth)
{
struct audata *au = AUTH_PRIVATE(auth);
struct authunix_parms aup;
struct timeval now;
XDR xdrs;
int stat;
if (auth->ah_cred.oa_base == au->au_origcred.oa_base) {
/* there is no hope. Punt */
return (FALSE);
}
au->au_shfaults ++;
/* first deserialize the creds back into a struct authunix_parms */
aup.aup_machname = NULL;
aup.aup_gids = (int *)NULL;
xdrmem_create(&xdrs, au->au_origcred.oa_base,
au->au_origcred.oa_length, XDR_DECODE);
stat = xdr_authunix_parms(&xdrs, &aup);
if (! stat)
goto done;
/* update the time and serialize in place */
(void)gettimeofday(&now, (struct timezone *)0);
aup.aup_time = now.tv_sec;
xdrs.x_op = XDR_ENCODE;
XDR_SETPOS(&xdrs, 0);
stat = xdr_authunix_parms(&xdrs, &aup);
if (! stat)
goto done;
auth->ah_cred = au->au_origcred;
marshal_new_auth(auth);
done:
/* free the struct authunix_parms created by deserializing */
xdrs.x_op = XDR_FREE;
(void)xdr_authunix_parms(&xdrs, &aup);
XDR_DESTROY(&xdrs);
return (stat);
}
static void
authunix_destroy(AUTH *auth)
{
struct audata *au = AUTH_PRIVATE(auth);
mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length);
if (au->au_shcred.oa_base != NULL)
mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length);
mem_free(auth->ah_private, sizeof(struct audata));
if (auth->ah_verf.oa_base != NULL)
mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length);
mem_free((caddr_t)auth, sizeof(*auth));
}
/*
* Marshals (pre-serializes) an auth struct.
* sets private data, au_marshed and au_mpos
*/
static void
marshal_new_auth(AUTH *auth)
{
XDR xdr_stream;
XDR *xdrs = &xdr_stream;
struct audata *au = AUTH_PRIVATE(auth);
xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE);
if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) ||
(! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) {
perror("auth_none.c - Fatal marshalling problem");
} else {
au->au_mpos = XDR_GETPOS(xdrs);
}
XDR_DESTROY(xdrs);
}
