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mirror of https://git.FreeBSD.org/src.git synced 2024-12-22 11:17:19 +00:00
freebsd/usr.bin/chpass/edit.c
David Malone afa6d859f0 Minor post warns stuff.
1) Fix up vendor IDs for files I'm touching and put FBSDID in the right place.
2) Cast return value of snprintf to size_t rather than casting sizeof() to
   an int, 'cos we know snprintf returns a non-genative number.
3) Avoid 'char *blank = "";' by just strduping. This could be bad sometimes,
   but all these variables usually point at malloced memory so this makes
   them always point at malloced memory.
2002-03-30 13:44:45 +00:00

270 lines
7.5 KiB
C

/*-
* Copyright (c) 1990, 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.
*/
#if 0
#ifndef lint
static char sccsid[] = "@(#)edit.c 8.3 (Berkeley) 4/2/94";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/stat.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <md5.h>
#include <paths.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 "chpass.h"
#ifdef YP
#include "pw_yp.h"
#endif /* YP */
extern char *tempname;
void
edit(struct passwd *pw)
{
struct stat begin, end;
char *begin_sum, *end_sum;
for (;;) {
if (stat(tempname, &begin))
pw_error(tempname, 1, 1);
begin_sum = MD5File(tempname, (char *)NULL);
pw_edit(1);
if (stat(tempname, &end))
pw_error(tempname, 1, 1);
end_sum = MD5File(tempname, (char *)NULL);
if ((begin.st_mtime == end.st_mtime) &&
(strcmp(begin_sum, end_sum) == 0)) {
warnx("no changes made");
pw_error(NULL, 0, 0);
}
free(begin_sum);
free(end_sum);
if (verify(pw))
break;
pw_prompt();
}
}
/*
* display --
* print out the file for the user to edit; strange side-effect:
* set conditional flag if the user gets to edit the shell.
*/
void
display(int fd, struct passwd *pw)
{
FILE *fp;
char *bp, *p;
if (!(fp = fdopen(fd, "w")))
pw_error(tempname, 1, 1);
(void)fprintf(fp,
#ifdef YP
"#Changing %s information for %s.\n", _use_yp ? "NIS" : "user database", pw->pw_name);
if (!uid && (!_use_yp || suser_override)) {
#else
"#Changing user database information for %s.\n", pw->pw_name);
if (!uid) {
#endif /* YP */
(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)) || !uid)
/*
* 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;
bp = pw->pw_gecos;
p = strsep(&bp, ",");
p = strdup(p ? p : "");
list[E_NAME].save = p;
if (!list[E_NAME].restricted || !uid)
(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 || !uid)
(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 || !uid)
(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 || !uid)
(void)fprintf(fp, "Home Phone: %s\n", p);
bp = strdup(bp ? bp : "");
list[E_OTHER].save = bp;
if (!list[E_OTHER].restricted || !uid)
(void)fprintf(fp, "Other information: %s\n", bp);
(void)fchown(fd, getuid(), getgid());
(void)fclose(fp);
}
int
verify(struct passwd *pw)
{
ENTRY *ep;
char *p;
struct stat sb;
FILE *fp;
int len, line;
static char buf[LINE_MAX];
if (!(fp = fopen(tempname, "r")))
pw_error(tempname, 1, 1);
if (fstat(fileno(fp), &sb))
pw_error(tempname, 1, 1);
if (sb.st_size == 0) {
warnx("corrupted temporary file");
goto bad;
}
line = 0;
while (fgets(buf, sizeof(buf), fp)) {
line++;
if (!buf[0] || buf[0] == '#')
continue;
if (!(p = strchr(buf, '\n'))) {
warnx("line %d too long", line);
goto bad;
}
*p = '\0';
for (ep = list;; ++ep) {
if (!ep->prompt) {
warnx("unrecognized field on line %d", line);
goto bad;
}
if (!strncasecmp(buf, ep->prompt, ep->len)) {
if (ep->restricted && uid) {
warnx(
"you may not change the %s field",
ep->prompt);
goto bad;
}
if (!(p = strchr(buf, ':'))) {
warnx("line %d corrupted", line);
goto bad;
}
while (isspace(*++p));
if (ep->except && strpbrk(p, ep->except)) {
warnx(
"illegal character in the \"%s\" field",
ep->prompt);
goto bad;
}
if ((ep->func)(p, pw, ep)) {
bad: (void)fclose(fp);
return (0);
}
break;
}
}
}
(void)fclose(fp);
/* Build the gecos field. */
len = strlen(list[E_NAME].save) + strlen(list[E_BPHONE].save) +
strlen(list[E_HPHONE].save) + strlen(list[E_LOCATE].save) +
strlen(list[E_OTHER].save) + 5;
if (!(p = malloc(len)))
err(1, NULL);
(void)sprintf(pw->pw_gecos = 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);
while ((len = strlen(pw->pw_gecos)) && pw->pw_gecos[len - 1] == ',')
pw->pw_gecos[len - 1] = '\0';
if ((size_t)snprintf(buf, sizeof(buf),
"%s:%s:%lu:%lu:%s:%ld:%ld:%s:%s:%s",
pw->pw_name, pw->pw_passwd, (unsigned long)pw->pw_uid,
(unsigned long)pw->pw_gid, pw->pw_class, (long)pw->pw_change,
(long)pw->pw_expire, pw->pw_gecos, pw->pw_dir,
pw->pw_shell) >= sizeof(buf)) {
warnx("entries too long");
free(p);
return (0);
}
free(p);
return (__pw_scan(buf, pw, _PWSCAN_WARN|_PWSCAN_MASTER));
}