Take the ypchfn/ypchsh stuff that was removed from passwd

and graft it into chpass.

Chpass can now tell when it's being asked to operate on an NIS
user and it displayes the appropriate message in the editor
template ("Changing NIS information for foo"). After the changes
have been made, chpass will promte the user for his NIS password.
If the password is correct, the changes are committed to yppasswdd.

Hopefully, this should make NIS more transparent to the end user.

Note that even the superuser needs to know a user's password before
he can change any NIS information (such is the nature of yppasswdd).
Also, changes to the password field are not permitted -- that's what
yppasswd is for. (The superuser may specify a new password, but
again, he needs to know the user's original password before he can
change it.)

1 files changed, 241 insertions, 0 deletions

diff --git a/chpass/pw_yp.c b/chpass/pw_yp.c
new file mode 100644
index 0000000..6fd87f5
--- /dev/null
+++ b/chpass/pw_yp.c
@@ -0,0 +1,241 @@
+/*
+ * Copyright (c) 1995
+ *	Bill Paul <wpaul@ctr.columbia.edu>.  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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by Bill Paul.
+ * 4. Neither the name of the author nor the names of any co-contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Bill Paul 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 REGENTS 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.
+ *
+ * NIS interface routines for chpass
+ * 
+ * Written by Bill Paul <wpaul@ctr.columbia.edu>
+ * Center for Telecommunications Research
+ * Columbia University, New York City
+ *
+ *	$Id$
+ */
+
+#ifdef YP
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>  
+#include <netdb.h>
+#include <time.h>
+#include <sys/types.h>
+#include <pwd.h>
+#include <errno.h>
+#include <err.h>
+#include <unistd.h>
+#include <db.h>
+#include <fcntl.h>
+#include <utmp.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/param.h>
+#include <limits.h>
+#include <rpc/rpc.h>
+#include <rpcsvc/yp_prot.h>
+#include <rpcsvc/ypclnt.h>
+#include <rpcsvc/yppasswd.h>
+#include <pw_util.h>
+#include "pw_yp.h"
+
+#define PERM_SECURE (S_IRUSR|S_IWUSR)
+HASHINFO openinfo = {
+        4096,           /* bsize */
+        32,             /* ffactor */
+        256,            /* nelem */
+        2048 * 1024,    /* cachesize */
+        NULL,           /* hash */
+        0,              /* lorder */
+};
+
+int _use_yp = 0;
+
+/*
+ * Check if the user we're working with is local or in NIS.
+ */
+int use_yp (user)
+char *user;
+{
+	int yp_enabled = 0, user_not_local = 0, exists = 0;
+	DB *dbp;
+	DBT key,data;
+	char bf[UT_NAMESIZE + 2];
+
+	if ((dbp = dbopen(_PATH_MP_DB, O_RDONLY, PERM_SECURE,
+			DB_HASH, &openinfo)) == NULL)
+			errx(1, "error opening database: %s.", _PATH_MP_DB);
+	bf[0] = _PW_KEYYPENABLED;
+	key.data = (u_char *)bf;
+	key.size = 1;
+	if (!(dbp->get)(dbp,&key,&data,0))
+		yp_enabled = 1;
+
+	bf[0] = _PW_KEYBYNAME;
+	bcopy((char *)user, bf + 1, MIN(strlen(user), UT_NAMESIZE));
+	key.data = (u_char *)bf;
+	key.size = strlen(user) + 1;
+	if ((dbp->get)(dbp,&key,&data,0))
+		user_not_local = 1;
+	
+	(dbp->close)(dbp);
+
+	if (getpwnam(user) != NULL)
+		exists = 1;
+
+	if (yp_enabled && user_not_local && exists)
+		return(1);
+	else
+		return(0);
+}
+
+/*
+ * Find the name of the NIS master server for this domain
+ * and make sure it's running yppasswdd.
+ */
+static char *get_yp_master(void)
+{
+	char *domain, *mastername;
+	int rval;
+
+	/* Get default NIS domain. */
+
+	if ((rval = yp_get_default_domain(&domain))) {
+		warnx("can't get local NIS domain name: %s",yperr_string(rval));
+		pw_error(NULL, 0, 1);
+	}
+
+	/* Get master server of passwd map. */
+
+	if ((rval = yp_master(domain, "passwd.byname", &mastername))) {
+		warnx("can't get master NIS server: %s", yperr_string(rval));
+		pw_error(NULL, 0, 1);
+	}
+
+	/* Check if yppasswdd is out there. */
+
+	if ((rval = getrpcport(mastername, YPPASSWDPROG, YPPASSWDPROC_UPDATE,
+		IPPROTO_UDP)) == 0) {
+		warnx("yppasswdd not running on NIS master server");
+		pw_error(NULL, 0, 1);
+	}
+
+	/*
+	 * Make sure it's on a reserved port.
+	 * XXX Might break with yppasswdd servers running on Solaris 2.x.
+	 */
+
+	if (rval >= IPPORT_RESERVED) {
+		warnx("yppasswdd server not running on reserved port");
+		pw_error(NULL, 0, 1);
+	}
+
+	/* Everything checks out: return the name of the server. */
+
+	return (mastername);
+}
+/*
+ * Ask the user for his NIS password and submit the new information
+ * to yppasswdd. Note that yppasswdd requires password authentication
+ * and only allows changes to existing records rather than the addition
+ * of new records. (To do actual updates we would need something like
+ * secure RPC and ypupdated, which FreeBSD doesn't have yet.) This means
+ * that the superuser cannot use chpass(1) to add new users records to
+ * the NIS password database.
+ */
+void yp_submit(pw)
+struct passwd *pw;
+{
+	struct yppasswd yppasswd;
+	CLIENT *clnt;
+	char *master, *password, *encpass;
+	int rval, status = 0;
+	struct timeval	tv;
+
+	/* Populate the yppasswd structure that gets handed to yppasswdd. */
+	/*
+	 * XXX This is done first to work around what looks like a very
+	 * strange memory corruption bug: the text fields pointed to
+	 * by the members of the 'pw' structure appear to be clobbered
+	 * after get_yp_master() returns (in particular, it happens
+	 * during getrpcport()). I don't know exactly where the problem
+	 * lies: I traced it all the way to gethostbyname(), then gave
+	 * up.
+	 */
+	yppasswd.newpw.pw_passwd = strdup(pw->pw_passwd);
+	yppasswd.newpw.pw_name = strdup(pw->pw_name);
+	yppasswd.newpw.pw_uid = pw->pw_uid;
+	yppasswd.newpw.pw_gid = pw->pw_gid;
+	yppasswd.newpw.pw_gecos = strdup(pw->pw_gecos);
+	yppasswd.newpw.pw_dir = strdup(pw->pw_dir);
+	yppasswd.newpw.pw_shell = strdup(pw->pw_shell);
+
+	/* Get NIS master server name */
+
+	master = get_yp_master();
+
+	/* Get the user's password for authentication purposes. */
+
+	printf ("Changing NIS information for %s on %s\n",
+					yppasswd.newpw.pw_name, master);
+	encpass = (getpwnam(yppasswd.newpw.pw_name))->pw_passwd;
+	password = getpass("Please enter password: ");
+	if (strncmp(crypt(password, encpass), encpass, strlen(encpass))) {
+		warnx("Password incorrect.");
+		pw_error(NULL, 0, 1);
+	}
+
+	yppasswd.oldpass = password;	/* XXX */
+
+	/* Create a handle to yppasswdd. */
+
+	clnt = clnt_create(master, YPPASSWDPROG, YPPASSWDVERS, "udp");
+	clnt->cl_auth = authunix_create_default();
+
+	/* Set a timeout and make the RPC call. */
+
+	tv.tv_sec = 20;
+	tv.tv_usec = 0;
+	rval = clnt_call(clnt, YPPASSWDPROC_UPDATE, xdr_yppasswd,
+		(char *)&yppasswd, xdr_int, (char *)&status, &tv);
+
+	/* Call failed: signal the error. */
+
+	if (rval) {
+		warnx("NIS update failed: %s", clnt_sperrno(rval));
+		pw_error(NULL, 0, 1);
+	}
+
+	/* Success. */
+
+	auth_destroy(clnt->cl_auth);
+	clnt_destroy(clnt);
+	warnx("NIS information changed on host %s", master);
+
+	return;
+}
+#endif /* YP */