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- /*
- * $Id: auth_unix.c,v 4.2 1994/09/29 23:48:50 jraja Exp $
- *
- * Implements UNIX style authentication parameters.
- *
- * Copyright © 1994 AmiTCP/IP Group,
- * Network Solutions Development Inc.
- * All rights reserved.
- */
-
- /* @(#)auth_unix.c 2.2 88/08/01 4.0 RPCSRC */
- #if !defined(lint) && defined(SCCSIDS)
- static char sccsid[] = "@(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro";
- #endif
-
- /*
- * 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 <sys/param.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <rpc/types.h>
- #include <rpc/xdr.h>
- #include <rpc/auth.h>
- #include <rpc/auth_unix.h>
-
- #ifdef AMITCP
- #include <bsdsocket.h>
- #endif
-
- /*
- * Unix authenticator operations vector
- */
- static void authunix_nextverf(AUTH * auth);
- static bool_t authunix_marshal(AUTH * auth, XDR * xdrs);
- static bool_t authunix_validate(AUTH * auth, struct opaque_auth * verfp);
- static bool_t authunix_refresh(AUTH * auth);
- static void authunix_destroy(AUTH * 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(AUTH *);
-
-
- /*
- * 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;
- uid_t uid;
- gid_t gid;
- register int len;
- gid_t *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;
- 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))
- return (NULL); /* was exit(3) */
- 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
- bcopy(mymem, au->au_origcred.oa_base, (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(void)
- {
- register int len;
- char machname[MAX_MACHINE_NAME + 1];
- register uid_t uid;
- register gid_t gid;
- gid_t gids[NGRPS];
-
- if (gethostname(machname, MAX_MACHINE_NAME) == -1)
- return (NULL); /* was exit(3) */
- machname[MAX_MACHINE_NAME] = 0;
- uid = geteuid();
- gid = getegid();
- if ((len = getgroups(NGRPS, gids)) < 0)
- return (NULL); /* was abort() */
- return (authunix_create(machname, uid, gid, len, gids));
- }
-
- /*
- * authunix operations
- */
-
- static void
- authunix_nextverf(auth)
- AUTH *auth;
- {
- /* no action necessary */
- }
-
- static bool_t
- authunix_marshal(auth, xdrs)
- AUTH *auth;
- XDR *xdrs;
- {
- register 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 *verfp)
- {
- register struct audata *au;
- XDR xdrs;
-
- if (verfp->oa_flavor == AUTH_SHORT) {
- au = AUTH_PRIVATE(auth);
- xdrmem_create(&xdrs, verfp->oa_base, verfp->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)
- register AUTH *auth;
- {
- register struct audata *au = AUTH_PRIVATE(auth);
- struct authunix_parms aup;
- struct timeval now;
- XDR xdrs;
- register 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 = (gid_t *)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)
- register AUTH *auth;
- {
- register 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)
- register AUTH *auth;
- {
- XDR xdr_stream;
- register XDR *xdrs = &xdr_stream;
- register 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);
- }
-