usr.bin/chpass/pw_copy.c

   1 /*-
   2  * Copyright (c) 1990, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * $FreeBSD: src/usr.bin/chpass/pw_copy.c,v 1.9.2.2 2002/03/24 09:00:03 cjc Exp $
  34  * $DragonFly: src/usr.bin/chpass/pw_copy.c,v 1.3 2003/10/02 17:42:26 hmp Exp $
  35  *
  36  * @(#)pw_copy.c        8.4 (Berkeley) 4/2/94
  37  */
  38
  39 /*
  40  * This module is used to copy the master password file, replacing a single
  41  * record, by chpass(1) and passwd(1).
  42  */
  43
  44 #include <err.h>
  45 #include <pwd.h>
  46 #include <stdio.h>
  47 #include <string.h>
  48 #include <unistd.h>
  49
  50 #include <pw_scan.h>
  51 #include <pw_util.h>
  52
  53 #include "pw_copy.h"
  54
  55 extern char *tempname;
  56
  57 /* for use in pw_copy(). Compare a pw entry to a pw struct. */
  58 static int
  59 pw_equal(char *buf, struct passwd *pw)
  60 {
  61         struct passwd buf_pw;
  62         int len;
  63
  64         len = strlen (buf);
  65         if (buf[len-1] == '\n')
  66                 buf[len-1] = '\0';
  67         if (!pw_scan(buf, &buf_pw))
  68                 return 0;
  69         return (strcmp(pw->pw_name, buf_pw.pw_name) == 0
  70             && pw->pw_uid == buf_pw.pw_uid
  71             && pw->pw_gid == buf_pw.pw_gid
  72             && strcmp(pw->pw_class, buf_pw.pw_class) == 0
  73             && (long)pw->pw_change == (long)buf_pw.pw_change
  74             && (long)pw->pw_expire == (long)buf_pw.pw_expire
  75             && strcmp(pw->pw_gecos, buf_pw.pw_gecos) == 0
  76             && strcmp(pw->pw_dir, buf_pw.pw_dir) == 0
  77             && strcmp(pw->pw_shell, buf_pw.pw_shell) == 0);
  78 }
  79
  80
  81 void
  82 pw_copy(int ffd, int tfd, struct passwd *pw, struct passwd *old_pw)
  83 {
  84         FILE *from, *to;
  85         int done;
  86         char *p, buf[8192];
  87         char uidstr[20];
  88         char gidstr[20];
  89         char chgstr[20];
  90         char expstr[20];
  91
  92         snprintf(uidstr, sizeof(uidstr), "%lu", (unsigned long)pw->pw_uid);
  93         snprintf(gidstr, sizeof(gidstr), "%lu", (unsigned long)pw->pw_gid);
  94         snprintf(chgstr, sizeof(chgstr), "%ld", (long)pw->pw_change);
  95         snprintf(expstr, sizeof(expstr), "%ld", (long)pw->pw_expire);
  96
  97         if (!(from = fdopen(ffd, "r")))
  98                 pw_error(_PATH_MASTERPASSWD, 1, 1);
  99         if (!(to = fdopen(tfd, "w")))
 100                 pw_error(tempname, 1, 1);
 101
 102         for (done = 0; fgets(buf, sizeof(buf), from);) {
 103                 if (!strchr(buf, '\n')) {
 104                         warnx("%s: line too long", _PATH_MASTERPASSWD);
 105                         pw_error(NULL, 0, 1);
 106                 }
 107                 if (done) {
 108                         (void)fprintf(to, "%s", buf);
 109                         if (ferror(to))
 110                                 goto err;
 111                         continue;
 112                 }
 113                 for (p = buf; *p != '\n'; p++)
 114                         if (*p != ' ' && *p != '\t')
 115                                 break;
 116                 if (*p == '#' || *p == '\n') {
 117                         (void)fprintf(to, "%s", buf);
 118                         if (ferror(to))
 119                                 goto err;
 120                         continue;
 121                 }
 122                 if (!(p = strchr(buf, ':'))) {
 123                         warnx("%s: corrupted entry", _PATH_MASTERPASSWD);
 124                         pw_error(NULL, 0, 1);
 125                 }
 126                 *p = '\0';
 127                 if (strcmp(buf, pw->pw_name)) {
 128                         *p = ':';
 129                         (void)fprintf(to, "%s", buf);
 130                         if (ferror(to))
 131                                 goto err;
 132                         continue;
 133                 }
 134                 *p = ':';
 135                 if (old_pw && !pw_equal(buf, old_pw)) {
 136                         warnx("%s: entry inconsistent",
 137                               _PATH_MASTERPASSWD);
 138                         pw_error(NULL, 0, 1);
 139                 }
 140                 (void)fprintf(to, "%s:%s:%s:%s:%s:%s:%s:%s:%s:%s\n",
 141                     pw->pw_name, pw->pw_passwd,
 142                     pw->pw_fields & _PWF_UID ? uidstr : "",
 143                     pw->pw_fields & _PWF_GID ? gidstr : "",
 144                     pw->pw_class,
 145                     pw->pw_fields & _PWF_CHANGE ? chgstr : "",
 146                     pw->pw_fields & _PWF_EXPIRE ? expstr : "",
 147                     pw->pw_gecos, pw->pw_dir, pw->pw_shell);
 148                 done = 1;
 149                 if (ferror(to))
 150                         goto err;
 151         }
 152         if (!done) {
 153 #ifdef YP
 154         /* Ultra paranoid: shouldn't happen. */
 155                 if (getuid())  {
 156                         warnx("%s: not found in %s -- permission denied",
 157                                         pw->pw_name, _PATH_MASTERPASSWD);
 158                         pw_error(NULL, 0, 1);
 159                 } else
 160 #endif /* YP */
 161                 (void)fprintf(to, "%s:%s:%s:%s:%s:%s:%s:%s:%s:%s\n",
 162                     pw->pw_name, pw->pw_passwd,
 163                     pw->pw_fields & _PWF_UID ? uidstr : "",
 164                     pw->pw_fields & _PWF_GID ? gidstr : "",
 165                     pw->pw_class,
 166                     pw->pw_fields & _PWF_CHANGE ? chgstr : "",
 167                     pw->pw_fields & _PWF_EXPIRE ? expstr : "",
 168                     pw->pw_gecos, pw->pw_dir, pw->pw_shell);
 169         }
 170
 171         if (ferror(to))
 172 err:            pw_error(NULL, 1, 1);
 173         (void)fclose(to);
 174 }