BSD 4.4 Lite Usr.bin Sources

1 files changed, 192 insertions, 0 deletions

diff --git a/usr.bin/chpass/chpass.c b/usr.bin/chpass/chpass.c
new file mode 100644
index 0000000..0852c53
--- /dev/null
+++ b/usr.bin/chpass/chpass.c
@@ -0,0 +1,192 @@
+/*-
+ * Copyright (c) 1988, 1993, 1994
+ *	The Regents of the University of California.  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 the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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.
+ */
+
+#ifndef lint
+static char copyright[] =
+"@(#) Copyright (c) 1988, 1993, 1994\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)chpass.c	8.4 (Berkeley) 4/2/94";
+#endif /* not lint */
+
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <sys/signal.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+
+#include <ctype.h>
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <pw_scan.h>
+#include <pw_util.h>
+#include "pw_copy.h"
+
+#include "chpass.h"
+#include "pathnames.h"
+
+char *progname = "chpass";
+char *tempname;
+uid_t uid;
+
+void	baduser __P((void));
+void	usage __P((void));
+
+int
+main(argc, argv)
+	int argc;
+	char **argv;
+{
+	enum { NEWSH, LOADENTRY, EDITENTRY } op;
+	struct passwd *pw, lpw;
+	int ch, pfd, tfd;
+	char *arg;
+
+	op = EDITENTRY;
+	while ((ch = getopt(argc, argv, "a:s:")) != EOF)
+		switch(ch) {
+		case 'a':
+			op = LOADENTRY;
+			arg = optarg;
+			break;
+		case 's':
+			op = NEWSH;
+			arg = optarg;
+			break;
+		case '?':
+		default:
+			usage();
+		}
+	argc -= optind;
+	argv += optind;
+
+	uid = getuid();
+
+	if (op == EDITENTRY || op == NEWSH)
+		switch(argc) {
+		case 0:
+			if (!(pw = getpwuid(uid)))
+				errx(1, "unknown user: uid %u", uid);
+			break;
+		case 1:
+			if (!(pw = getpwnam(*argv)))
+				errx(1, "unknown user: %s", *argv);
+			if (uid && uid != pw->pw_uid)
+				baduser();
+			break;
+		default:
+			usage();
+		}
+
+	if (op == NEWSH) {
+		/* protect p_shell -- it thinks NULL is /bin/sh */
+		if (!arg[0])
+			usage();
+		if (p_shell(arg, pw, (ENTRY *)NULL))
+			pw_error((char *)NULL, 0, 1);
+	}
+
+	if (op == LOADENTRY) {
+		if (uid)
+			baduser();
+		pw = &lpw;
+		if (!pw_scan(arg, pw))
+			exit(1);
+	}
+
+	/*
+	 * The temporary file/file descriptor usage is a little tricky here.
+	 * 1:	We start off with two fd's, one for the master password
+	 *	file (used to lock everything), and one for a temporary file.
+	 * 2:	Display() gets an fp for the temporary file, and copies the
+	 *	user's information into it.  It then gives the temporary file
+	 *	to the user and closes the fp, closing the underlying fd.
+	 * 3:	The user edits the temporary file some number of times.
+	 * 4:	Verify() gets an fp for the temporary file, and verifies the
+	 *	contents.  It can't use an fp derived from the step #2 fd,
+	 *	because the user's editor may have created a new instance of
+	 *	the file.  Once the file is verified, its contents are stored
+	 *	in a password structure.  The verify routine closes the fp,
+	 *	closing the underlying fd.
+	 * 5:	Delete the temporary file.
+	 * 6:	Get a new temporary file/fd.  Pw_copy() gets an fp for it
+	 *	file and copies the master password file into it, replacing
+	 *	the user record with a new one.  We can't use the first
+	 *	temporary file for this because it was owned by the user.
+	 *	Pw_copy() closes its fp, flushing the data and closing the
+	 *	underlying file descriptor.  We can't close the master
+	 *	password fp, or we'd lose the lock.
+	 * 7:	Call pw_mkdb() (which renames the temporary file) and exit.
+	 *	The exit closes the master passwd fp/fd.
+	 */
+	pw_init();
+	pfd = pw_lock();
+	tfd = pw_tmp();
+
+	if (op == EDITENTRY) {
+		display(tfd, pw);
+		edit(pw);
+		(void)unlink(tempname);
+		tfd = pw_tmp();
+	}
+		
+	pw_copy(pfd, tfd, pw);
+
+	if (!pw_mkdb())
+		pw_error((char *)NULL, 0, 1);
+	exit(0);
+}
+
+void
+baduser()
+{
+
+	errx(1, "%s", strerror(EACCES));
+}
+
+void
+usage()
+{
+
+	(void)fprintf(stderr, "usage: chpass [-a list] [-s shell] [user]\n");
+	exit(1);
+}