usr/src/usr.bin/chpass/edit.c

/*-
 * Copyright (c) 1990, 1993
 *      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 sccsid[] = "@(#)edit.c      8.1 (Berkeley) 6/6/93";
#endif /* not lint */

#include <sys/param.h>
#include <sys/stat.h>
#include <pwd.h>
#include <errno.h>
#include <stdio.h>
#include <paths.h>
#include <stdlib.h>
#include <string.h>
#include "chpass.h"

extern char *tempname;

void
edit(pw)
        struct passwd *pw;
{
        struct stat begin, end;

        for (;;) {
                if (stat(tempname, &begin))
                        pw_error(tempname, 1, 1);
                pw_edit(1);
                if (stat(tempname, &end))
                        pw_error(tempname, 1, 1);
                if (begin.st_mtime == end.st_mtime) {
                        (void)fprintf(stderr, "chpass: no changes made\n");
                        pw_error(NULL, 0, 0);
                }
                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.
 */
display(fd, pw)
        int fd;
        struct passwd *pw;
{
        register char *p;
        FILE *fp;
        char *bp, *ok_shell(), *ttoa();

        if (!(fp = fdopen(fd, "w")))
                pw_error(tempname, 1, 1);

        (void)fprintf(fp,
            "#Changing user database information for %s.\n", pw->pw_name);
        if (!uid) {
                (void)fprintf(fp, "Login: %s\n", pw->pw_name);
                (void)fprintf(fp, "Password: %s\n", pw->pw_passwd);
                (void)fprintf(fp, "Uid [#]: %d\n", pw->pw_uid);
                (void)fprintf(fp, "Gid [# or name]: %d\n", 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. */
        else if (ok_shell(pw->pw_shell))
                /*
                 * Make shell a restricted field.  Ugly with a
                 * necklace, but there's not much else to do.
                 */
                (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, ",");
        (void)fprintf(fp, "Full Name: %s\n", p ? p : "");
        p = strsep(&bp, ",");
        (void)fprintf(fp, "Location: %s\n", p ? p : "");
        p = strsep(&bp, ",");
        (void)fprintf(fp, "Office Phone: %s\n", p ? p : "");
        p = strsep(&bp, ",");
        (void)fprintf(fp, "Home Phone: %s\n", p ? p : "");

        (void)fchown(fd, getuid(), getgid());
        (void)fclose(fp);
}

verify(pw)
        struct passwd *pw;
{
        register ENTRY *ep;
        register char *p;
        struct stat sb;
        FILE *fp;
        int len;
        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) {
                (void)fprintf(stderr, "chpass: corrupted temporary file.\n");
                goto bad;
        }
        while (fgets(buf, sizeof(buf), fp)) {
                if (!buf[0] || buf[0] == '#')
                        continue;
                if (!(p = index(buf, '\n'))) {
                        (void)fprintf(stderr, "chpass: line too long.\n");
                        goto bad;
                }
                *p = '\0';
                for (ep = list;; ++ep) {
                        if (!ep->prompt) {
                                (void)fprintf(stderr,
                                    "chpass: unrecognized field.\n");
                                goto bad;
                        }
                        if (!strncasecmp(buf, ep->prompt, ep->len)) {
                                if (ep->restricted && uid) {
                                        (void)fprintf(stderr,
                            "chpass: you may not change the %s field.\n",
                                            ep->prompt);
                                        goto bad;
                                }
                                if (!(p = index(buf, ':'))) {
                                        (void)fprintf(stderr,
                                            "chpass: line corrupted.\n");
                                        goto bad;
                                }
                                while (isspace(*++p));
                                if (ep->except && strpbrk(p, ep->except)) {
                                        (void)fprintf(stderr,
                            "chpass: illegal character in the \"%s\" field.\n",
                                            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) + 4;
        if (!(p = malloc(len))) {
                (void)fprintf(stderr, "chpass: %s\n", strerror(errno));
                exit(1);
        }
        (void)sprintf(pw->pw_gecos = p, "%s,%s,%s,%s", list[E_NAME].save,
            list[E_LOCATE].save, list[E_BPHONE].save, list[E_HPHONE].save);

        if (snprintf(buf, sizeof(buf),
            "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s",
            pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid, pw->pw_class,
            pw->pw_change, pw->pw_expire, pw->pw_gecos, pw->pw_dir,
            pw->pw_shell) >= sizeof(buf)) {
                (void)fprintf(stderr, "chpass: entries too long\n");
                return(0);
        }
        return(pw_scan(buf, pw));
}