Add securenets support (uses same access control mechanism as ypserv,
also controlled by /var/yp/securenets). Add -u flag to turn off the privileged port check done by yp_access(); some commercial systems (IRIX, Solaris 2.x, HP-UX, and probably others) don't use a reserved port for submitting yppasswd updates. If we always enforce the check, these client systems will be unable to submit updates to us. Document securenets support and -u flag in man page. Like ypserv, you can compile rpc.yppasswdd to use the tcpwrapper package instead of securenets if you want to.
This commit is contained in:
Bill Paul
parent
f7f470a811
commit
589b8bfc35
@ -1,8 +1,8 @@
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# $Id: Makefile,v 1.3 1996/02/11 02:46:48 wpaul Exp $
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# $Id: Makefile,v 1.1.1.1 1996/02/12 15:09:01 wpaul Exp $
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PROG= rpc.yppasswdd
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SRCS= pw_copy.c pw_util.c yppasswd_svc.c yp_error.c ypxfr_misc.c \
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yp_clnt.c yp_dblookup.c yppasswd_private_xdr.c \
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yp_clnt.c yp_dblookup.c yp_access.c yppasswd_private_xdr.c \
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util.c yppasswdd_server.c yppasswd_comm.c yppasswdd_main.c
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.PATH: ${.CURDIR}/../../usr.sbin/ypserv ${.CURDIR}/../../usr.bin/chpass \
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@ -28,7 +28,7 @@
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $Id: rpc.yppasswdd.8,v 1.3 1996/02/12 14:44:15 wpaul Exp $
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.\" $Id: rpc.yppasswdd.8,v 1.5 1996/02/24 21:41:47 wpaul Exp $
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.\"
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.Dd February 8, 1996
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.Dt RPC.YPPASSWDD 8
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@ -46,6 +46,7 @@
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.Op Fl a
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.Op Fl m
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.Op Fl v
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.Op Fl u
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.Op Fl h
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.Sh DESCRIPTION
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The
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@ -80,7 +81,19 @@ or
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commands. (Some administrators don't want users to be able to change their
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full name information or shells; the server can be invoked with option flags
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that disallow such changes.) When the server receives an update request,
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it checks the 'old' password supplied by the user to make sure it's
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it compares the address of the client making the request against the
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.Pa securenets
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rules outlined in
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.Pa /var/yp/securenets .
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(See the
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.Xr ypserv 8
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manual page for more information on securenets; the
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.Nm rpc.yppasswdd
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server uses the same access control mechanism as
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.Xr ypserv 8 .)
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.Pp
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The server then
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checks the 'old' password supplied by the user to make sure it's
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valid, then performs some sanity checks on the updated information (these
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include checking for embedded control characters, colons or invalid shells).
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Once it is satisfied that the update request is valid, the server modifies
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@ -229,6 +242,31 @@ updates for the super-user on the NIS master server. Running the server
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with the
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.Fl v
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flag will cause it to log informational messages for all updates.
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.It Fl u
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Many commercial
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.Xr yppasswd 1
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clients do not use a reserved port when sending requests to
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.Nm rpc.yppasswdd .
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This is either because the
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.Xr yppasswd 1
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program is not installed set-uid root, or because the RPC
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implementation does not place any emphasis on binding to reserved
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ports when establishing client connections for the super-user.
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By default,
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.Nm rpc.yppasswdd
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expects to receive requests from clients using reserved ports; requests
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received from non-privileged ports are rejected. Unfortunately, this
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behavior prevents any client systems that to not use privileged
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ports from sucessfully submitting password updates. Specifying
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the
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.Fl u
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flag to
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.Nm rpc.yppasswdd
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disables the privileged port check so that it will work with
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.Xr yppasswd 1
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clients that don't use privileged ports. This reduces security to
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a certain small degree, but it might be necessary in cases where it
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is not possible to change the client behavior.
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.It Fl h
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Displays the list of flags and options understood by
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.Nm rpc.yppasswdd .
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@ -29,7 +29,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: yppasswdd_extern.h,v 1.4 1996/02/01 04:38:39 wpaul Exp $
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* $Id: yppasswdd_extern.h,v 1.5 1996/02/24 21:41:36 wpaul Exp $
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*/
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#include <sys/types.h>
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@ -65,7 +65,10 @@ extern int no_chsh;
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extern int no_chfn;
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extern int allow_additions;
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extern int multidomain;
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extern int resvport;
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extern int verbose;
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extern int _rpc_dtablesize __P((void));
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extern void yp_error __P((const char *, ...));
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extern void load_securenets __P(( void ));
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extern int yp_access __P((const char *, const struct svc_req * ));
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extern int yp_get_record __P(( const char *, const char *, const DBT *, DBT *, int));
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@ -29,7 +29,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: yppasswdd_main.c,v 1.8 1996/02/09 04:21:35 wpaul Exp $
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* $Id: yppasswdd_main.c,v 1.10 1996/02/24 21:41:15 wpaul Exp $
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*/
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#include "yppasswd.h"
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@ -72,7 +72,7 @@ struct dom_binding {};
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#define _RPCSVC_CLOSEDOWN 120
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#ifndef lint
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static const char rcsid[] = "$Id: yppasswdd_main.c,v 1.8 1996/02/09 04:21:35 wpaul Exp $";
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static const char rcsid[] = "$Id: yppasswdd_main.c,v 1.10 1996/02/24 21:41:15 wpaul Exp $";
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#endif /* not lint */
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int _rpcpmstart = 0; /* Started by a port monitor ? */
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static int _rpcfdtype;
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@ -93,6 +93,7 @@ int no_chfn = 0;
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int allow_additions = 0;
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int multidomain = 0;
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int verbose = 0;
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int resvport = 1;
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char *yp_dir = "/var/yp/";
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int yp_sock;
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@ -145,7 +146,13 @@ static void terminate(sig)
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unlink(sockname);
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exit(0);
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}
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static void reload(sig)
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int sig;
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{
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load_securenets();
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}
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static void
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closedown(int sig)
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{
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@ -181,7 +188,7 @@ closedown(int sig)
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static void usage()
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{
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fprintf(stderr, "Usage: %s [-t master.passwd file] [-d domain] \
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[-p path] [-s] [-f] [-m] [-a] [-v] [-h]\n",
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[-p path] [-s] [-f] [-m] [-a] [-v] [-u] [-h]\n",
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progname);
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exit(1);
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}
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@ -230,6 +237,9 @@ main(argc, argv)
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case 'v':
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verbose++;
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break;
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case 'u':
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resvport = 0;
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break;
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default:
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case 'h':
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usage();
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@ -245,6 +255,8 @@ name isn't set -- aborting");
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}
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}
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load_securenets();
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if (getrpcport("localhost", YPPROG, YPVERS, IPPROTO_UDP) <= 0) {
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yp_error("this host is not an NIS server -- aborting");
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exit(1);
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@ -266,6 +278,8 @@ name isn't set -- aborting");
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exit(1);
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}
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debug = 0;
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if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
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int ssize = sizeof (int);
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@ -343,13 +357,15 @@ name isn't set -- aborting");
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(void) signal(SIGALRM, (SIG_PF) closedown);
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(void) alarm(_RPCSVC_CLOSEDOWN/2);
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}
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/* set up resporce limits and block signals */
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/* set up resource limits and block signals */
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pw_init();
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/* except SIGCHLD, which we need to catch */
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install_reaper(1);
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signal(SIGTERM, (SIG_PF) terminate);
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signal(SIGHUP, (SIG_PF) reload);
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unlink(sockname);
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yp_sock = makeservsock();
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if (chmod(sockname, 0))
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@ -29,7 +29,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: yppasswdd_server.c,v 1.8 1996/02/09 04:38:19 wpaul Exp $
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* $Id: yppasswdd_server.c,v 1.11 1996/02/24 21:41:15 wpaul Exp $
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*/
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#include <stdio.h>
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@ -60,7 +60,7 @@ struct dom_binding {};
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#include "yppasswd_comm.h"
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#ifndef lint
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static const char rcsid[] = "$Id: yppasswdd_server.c,v 1.8 1996/02/09 04:38:19 wpaul Exp $";
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static const char rcsid[] = "$Id: yppasswdd_server.c,v 1.11 1996/02/24 21:41:15 wpaul Exp $";
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#endif /* not lint */
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char *tempname;
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@ -338,6 +338,12 @@ yppasswdproc_update_1_svc(yppasswd *argp, struct svc_req *rqstp)
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rqhost = svc_getcaller(rqstp->rq_xprt);
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if (yp_access(resvport ? "master.passwd.byname" : NULL, rqstp)) {
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yp_error("rejected update request from unauthorized host");
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svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED);
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return(&result);
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}
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/*
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* Step one: find the user. (It's kinda pointless to
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* proceed if the user doesn't exist.) We look for the
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