FreeBSD-5.3/usr.bin/chpass/edit.c
/*-
* Copyright (c) 1990, 1993, 1994
* The Regents of the University of California. All rights reserved.
* Copyright (c) 2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* Portions of this software were developed for the FreeBSD Project by
* ThinkSec AS and NAI Labs, the Security Research Division of Network
* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
* ("CBOSS"), as part of the DARPA CHATS research program.
*
* 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.
*/
#if 0
#ifndef lint
static char sccsid[] = "@(#)edit.c 8.3 (Berkeley) 4/2/94";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/usr.bin/chpass/edit.c,v 1.23 2003/04/09 18:18:42 des Exp $");
#include <sys/param.h>
#include <sys/stat.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <paths.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pw_scan.h>
#include <libutil.h>
#include "chpass.h"
static int display(const char *tfn, struct passwd *pw);
static struct passwd *verify(const char *tfn, struct passwd *pw);
struct passwd *
edit(const char *tfn, struct passwd *pw)
{
struct passwd *npw;
char *line;
size_t len;
if (display(tfn, pw) == -1)
return (NULL);
for (;;) {
switch (pw_edit(1)) {
case -1:
return (NULL);
case 0:
return (pw_dup(pw));
default:
break;
}
if ((npw = verify(tfn, pw)) != NULL)
return (npw);
free(npw);
printf("re-edit the password file? ");
fflush(stdout);
if ((line = fgetln(stdin, &len)) == NULL) {
warn("fgetln()");
return (NULL);
}
if (len > 0 && (*line == 'N' || *line == 'n'))
return (NULL);
}
}
/*
* display --
* print out the file for the user to edit; strange side-effect:
* set conditional flag if the user gets to edit the shell.
*/
static int
display(const char *tfn, struct passwd *pw)
{
FILE *fp;
char *bp, *gecos, *p;
if ((fp = fopen(tfn, "w")) == NULL) {
warn("%s", tfn);
return (-1);
}
(void)fprintf(fp,
"#Changing user information for %s.\n", pw->pw_name);
if (master_mode) {
(void)fprintf(fp, "Login: %s\n", pw->pw_name);
(void)fprintf(fp, "Password: %s\n", pw->pw_passwd);
(void)fprintf(fp, "Uid [#]: %lu\n", (unsigned long)pw->pw_uid);
(void)fprintf(fp, "Gid [# or name]: %lu\n",
(unsigned long)pw->pw_gid);
(void)fprintf(fp, "Change [month day year]: %s\n",
ttoa(pw->pw_change));
(void)fprintf(fp, "Expire [month day year]: %s\n",
ttoa(pw->pw_expire));
(void)fprintf(fp, "Class: %s\n", pw->pw_class);
(void)fprintf(fp, "Home directory: %s\n", pw->pw_dir);
(void)fprintf(fp, "Shell: %s\n",
*pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
}
/* Only admin can change "restricted" shells. */
#if 0
else if (ok_shell(pw->pw_shell))
/*
* Make shell a restricted field. Ugly with a
* necklace, but there's not much else to do.
*/
#else
else if ((!list[E_SHELL].restricted && ok_shell(pw->pw_shell)) ||
master_mode)
/*
* If change not restrict (table.c) and standard shell
* OR if root, then allow editing of shell.
*/
#endif
(void)fprintf(fp, "Shell: %s\n",
*pw->pw_shell ? pw->pw_shell : _PATH_BSHELL);
else
list[E_SHELL].restricted = 1;
if ((bp = gecos = strdup(pw->pw_gecos)) == NULL) {
warn(NULL);
fclose(fp);
return (-1);
}
p = strsep(&bp, ",");
p = strdup(p ? p : "");
list[E_NAME].save = p;
if (!list[E_NAME].restricted || master_mode)
(void)fprintf(fp, "Full Name: %s\n", p);
p = strsep(&bp, ",");
p = strdup(p ? p : "");
list[E_LOCATE].save = p;
if (!list[E_LOCATE].restricted || master_mode)
(void)fprintf(fp, "Office Location: %s\n", p);
p = strsep(&bp, ",");
p = strdup(p ? p : "");
list[E_BPHONE].save = p;
if (!list[E_BPHONE].restricted || master_mode)
(void)fprintf(fp, "Office Phone: %s\n", p);
p = strsep(&bp, ",");
p = strdup(p ? p : "");
list[E_HPHONE].save = p;
if (!list[E_HPHONE].restricted || master_mode)
(void)fprintf(fp, "Home Phone: %s\n", p);
bp = strdup(bp ? bp : "");
list[E_OTHER].save = bp;
if (!list[E_OTHER].restricted || master_mode)
(void)fprintf(fp, "Other information: %s\n", bp);
free(gecos);
(void)fchown(fileno(fp), getuid(), getgid());
(void)fclose(fp);
return (0);
}
static struct passwd *
verify(const char *tfn, struct passwd *pw)
{
struct passwd *npw;
ENTRY *ep;
char *buf, *p, *val;
struct stat sb;
FILE *fp;
int line;
size_t len;
if ((pw = pw_dup(pw)) == NULL)
return (NULL);
if ((fp = fopen(tfn, "r")) == NULL ||
fstat(fileno(fp), &sb) == -1) {
warn("%s", tfn);
free(pw);
return (NULL);
}
if (sb.st_size == 0) {
warnx("corrupted temporary file");
fclose(fp);
free(pw);
return (NULL);
}
val = NULL;
for (line = 1; (buf = fgetln(fp, &len)) != NULL; ++line) {
if (*buf == '\0' || *buf == '#')
continue;
while (len > 0 && isspace(buf[len - 1]))
--len;
for (ep = list;; ++ep) {
if (!ep->prompt) {
warnx("%s: unrecognized field on line %d",
tfn, line);
goto bad;
}
if (ep->len > len)
continue;
if (strncasecmp(buf, ep->prompt, ep->len) != 0)
continue;
if (ep->restricted && !master_mode) {
warnx("%s: you may not change the %s field",
tfn, ep->prompt);
goto bad;
}
for (p = buf; p < buf + len && *p != ':'; ++p)
/* nothing */ ;
if (*p != ':') {
warnx("%s: line %d corrupted", tfn, line);
goto bad;
}
while (++p < buf + len && isspace(*p))
/* nothing */ ;
free(val);
asprintf(&val, "%.*s", (int)(buf + len - p), p);
if (val == NULL)
goto bad;
if (ep->except && strpbrk(val, ep->except)) {
warnx("%s: invalid character in \"%s\" field '%s'",
tfn, ep->prompt, val);
goto bad;
}
if ((ep->func)(val, pw, ep))
goto bad;
break;
}
}
free(val);
fclose(fp);
/* Build the gecos field. */
len = asprintf(&p, "%s,%s,%s,%s,%s", list[E_NAME].save,
list[E_LOCATE].save, list[E_BPHONE].save,
list[E_HPHONE].save, list[E_OTHER].save);
if (p == NULL) {
warn("asprintf()");
free(pw);
return (NULL);
}
while (len > 0 && p[len - 1] == ',')
p[--len] = '\0';
pw->pw_gecos = p;
buf = pw_make(pw);
free(pw);
free(p);
if (buf == NULL) {
warn("pw_make()");
return (NULL);
}
npw = pw_scan(buf, PWSCAN_WARN|PWSCAN_MASTER);
free(buf);
return (npw);
bad:
free(pw);
free(val);
fclose(fp);
return (NULL);
}