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  * $FreeBSD$
  34  */
  35
  36 #ifndef lint
  37 static const char sccsid[] = "@(#)pw_copy.c     8.4 (Berkeley) 4/2/94";
  38 #endif /* not lint */
  39
  40 #include <sys/cdefs.h>
  41 __FBSDID("$FreeBSD$");
  42
  43 /*
  44  * This module is used to copy the master password file, replacing a single
  45  * record, by chpass(1) and passwd(1).
  46  */
  47
  48 #include <err.h>
  49 #include <pwd.h>
  50 #include <stdio.h>
  51 #include <string.h>
  52 #include <unistd.h>
  53
  54 #include <pw_scan.h>
  55 #include <pw_util.h>
  56
  57 #include "pw_copy.h"
  58
  59 extern char *tempname;
  60
  61 /* for use in pw_copy(). Compare a pw entry to a pw struct. */
  62 static int
  63 pw_equal(char *buf, struct passwd *pw)
  64 {
  65         struct passwd buf_pw;
  66         int len;
  67
  68         len = strlen (buf);
  69         if (buf[len-1] == '\n')
  70                 buf[len-1] = '\0';
  71         if (!__pw_scan(buf, &buf_pw, _PWSCAN_MASTER))
  72                 return 0;
  73         return (strcmp(pw->pw_name, buf_pw.pw_name) == 0
  74             && pw->pw_uid == buf_pw.pw_uid
  75             && pw->pw_gid == buf_pw.pw_gid
  76             && strcmp(pw->pw_class, buf_pw.pw_class) == 0
  77             && (long)pw->pw_change == (long)buf_pw.pw_change
  78             && (long)pw->pw_expire == (long)buf_pw.pw_expire
  79             && strcmp(pw->pw_gecos, buf_pw.pw_gecos) == 0
  80             && strcmp(pw->pw_dir, buf_pw.pw_dir) == 0
  81             && strcmp(pw->pw_shell, buf_pw.pw_shell) == 0);
  82 }
  83
  84 void
  85 pw_copy(int ffd, int tfd, struct passwd *pw, struct passwd *old_pw)
  86 {
  87         FILE *from, *to;
  88         int done;
  89         char *p, buf[8192];
  90         char uidstr[20];
  91         char gidstr[20];
  92         char chgstr[20];
  93         char expstr[20];
  94
  95         snprintf(uidstr, sizeof(uidstr), "%lu", (unsigned long)pw->pw_uid);
  96         snprintf(gidstr, sizeof(gidstr), "%lu", (unsigned long)pw->pw_gid);
  97         snprintf(chgstr, sizeof(chgstr), "%ld", (long)pw->pw_change);
  98         snprintf(expstr, sizeof(expstr), "%ld", (long)pw->pw_expire);
  99
 100         if (!(from = fdopen(ffd, "r")))
 101                 pw_error(_PATH_MASTERPASSWD, 1, 1);
 102         if (!(to = fdopen(tfd, "w")))
 103                 pw_error(tempname, 1, 1);
 104
 105         for (done = 0; fgets(buf, sizeof(buf), from);) {
 106                 if (!strchr(buf, '\n')) {
 107                         warnx("%s: line too long", _PATH_MASTERPASSWD);
 108                         pw_error(NULL, 0, 1);
 109                 }
 110                 if (done) {
 111                         (void)fprintf(to, "%s", buf);
 112                         if (ferror(to))
 113                                 goto err;
 114                         continue;
 115                 }
 116                 for (p = buf; *p != '\n'; p++)
 117                         if (*p != ' ' && *p != '\t')
 118                                 break;
 119                 if (*p == '#' || *p == '\n') {
 120                         (void)fprintf(to, "%s", buf);
 121                         if (ferror(to))
 122                                 goto err;
 123                         continue;
 124                 }
 125                 if (!(p = strchr(buf, ':'))) {
 126                         warnx("%s: corrupted entry", _PATH_MASTERPASSWD);
 127                         pw_error(NULL, 0, 1);
 128                 }
 129                 *p = '\0';
 130                 if (strcmp(buf, pw->pw_name)) {
 131                         *p = ':';
 132                         (void)fprintf(to, "%s", buf);
 133                         if (ferror(to))
 134                                 goto err;
 135                         continue;
 136                 }
 137                 *p = ':';
 138                 if (old_pw && !pw_equal(buf, old_pw)) {
 139                         warnx("%s: entry for %s has changed",
 140                               _PATH_MASTERPASSWD, pw->pw_name);
 141                         pw_error(NULL, 0, 1);
 142                 }
 143                 (void)fprintf(to, "%s:%s:%s:%s:%s:%s:%s:%s:%s:%s\n",
 144                     pw->pw_name, pw->pw_passwd,
 145                     pw->pw_fields & _PWF_UID ? uidstr : "",
 146                     pw->pw_fields & _PWF_GID ? gidstr : "",
 147                     pw->pw_class,
 148                     pw->pw_fields & _PWF_CHANGE ? chgstr : "",
 149                     pw->pw_fields & _PWF_EXPIRE ? expstr : "",
 150                     pw->pw_gecos, pw->pw_dir, pw->pw_shell);
 151                 done = 1;
 152                 if (ferror(to))
 153                         goto err;
 154         }
 155         if (!done) {
 156 #ifdef YP
 157         /* Ultra paranoid: shouldn't happen. */
 158                 if (getuid())  {
 159                         warnx("%s: not found in %s -- permission denied",
 160                                         pw->pw_name, _PATH_MASTERPASSWD);
 161                         pw_error(NULL, 0, 1);
 162                 } else
 163 #endif /* YP */
 164                 (void)fprintf(to, "%s:%s:%s:%s:%s:%s:%s:%s:%s:%s\n",
 165                     pw->pw_name, pw->pw_passwd,
 166                     pw->pw_fields & _PWF_UID ? uidstr : "",
 167                     pw->pw_fields & _PWF_GID ? gidstr : "",
 168                     pw->pw_class,
 169                     pw->pw_fields & _PWF_CHANGE ? chgstr : "",
 170                     pw->pw_fields & _PWF_EXPIRE ? expstr : "",
 171                     pw->pw_gecos, pw->pw_dir, pw->pw_shell);
 172         }
 173
 174         if (ferror(to))
 175 err:            pw_error(NULL, 1, 1);
 176         (void)fclose(to);
 177 }