usr.bin/chpass/field.c

   1 /*
   2  * Copyright (c) 1988, 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  * @(#)field.c  8.4 (Berkeley) 4/2/94
  34  * $DragonFly: src/usr.bin/chpass/field.c,v 1.3 2003/10/02 19:42:26 hmp Exp $
  35  */
  36
  37 #include <sys/param.h>
  38 #include <sys/stat.h>
  39
  40 #include <ctype.h>
  41 #include <err.h>
  42 #include <errno.h>
  43 #include <grp.h>
  44 #include <pwd.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <unistd.h>
  49
  50 #include "chpass.h"
  51 #include "pathnames.h"
  52
  53 /* ARGSUSED */
  54 int
  55 p_login(char *p, struct passwd *pw, ENTRY *ep)
  56 {
  57         if (!*p) {
  58                 warnx("empty login field");
  59                 return (1);
  60         }
  61         if (*p == '-') {
  62                 warnx("login names may not begin with a hyphen");
  63                 return (1);
  64         }
  65         if (!(pw->pw_name = strdup(p))) {
  66                 warnx("can't save entry");
  67                 return (1);
  68         }
  69         if (strchr(p, '.'))
  70                 warnx("\'.\' is dangerous in a login name");
  71         for (; *p; ++p)
  72                 if (isupper(*p)) {
  73                         warnx("upper-case letters are dangerous in a login name");
  74                         break;
  75                 }
  76         return (0);
  77 }
  78
  79 /* ARGSUSED */
  80 int
  81 p_passwd(char *p, struct passwd *pw, ENTRY *ep)
  82 {
  83         if (!*p)
  84                 pw->pw_passwd = "";     /* "NOLOGIN"; */
  85         else if (!(pw->pw_passwd = strdup(p))) {
  86                 warnx("can't save password entry");
  87                 return (1);
  88         }
  89
  90         return (0);
  91 }
  92
  93 /* ARGSUSED */
  94 int
  95 p_uid(char *p, struct passwd *pw, ENTRY *ep)
  96 {
  97         uid_t id;
  98         char *np;
  99
 100         if (!*p) {
 101                 warnx("empty uid field");
 102                 return (1);
 103         }
 104         if (!isdigit(*p)) {
 105                 warnx("illegal uid");
 106                 return (1);
 107         }
 108         errno = 0;
 109         id = strtoul(p, &np, 10);
 110         if (*np || (id == ULONG_MAX && errno == ERANGE)) {
 111                 warnx("illegal uid");
 112                 return (1);
 113         }
 114         pw->pw_uid = id;
 115         return (0);
 116 }
 117
 118 /* ARGSUSED */
 119 int
 120 p_gid(char *p, struct passwd *pw, ENTRY *ep)
 121 {
 122         struct group *gr;
 123         gid_t id;
 124         char *np;
 125
 126         if (!*p) {
 127                 warnx("empty gid field");
 128                 return (1);
 129         }
 130         if (!isdigit(*p)) {
 131                 if (!(gr = getgrnam(p))) {
 132                         warnx("unknown group %s", p);
 133                         return (1);
 134                 }
 135                 pw->pw_gid = gr->gr_gid;
 136                 return (0);
 137         }
 138         errno = 0;
 139         id = strtoul(p, &np, 10);
 140         if (*np || (id == ULONG_MAX && errno == ERANGE)) {
 141                 warnx("illegal gid");
 142                 return (1);
 143         }
 144         pw->pw_gid = id;
 145         return (0);
 146 }
 147
 148 /* ARGSUSED */
 149 int
 150 p_class(char *p, struct passwd *pw, ENTRY *ep)
 151 {
 152         if (!*p)
 153                 pw->pw_class = "";
 154         else if (!(pw->pw_class = strdup(p))) {
 155                 warnx("can't save entry");
 156                 return (1);
 157         }
 158
 159         return (0);
 160 }
 161
 162 /* ARGSUSED */
 163 int
 164 p_change(char *p, struct passwd *pw, ENTRY *ep)
 165 {
 166         if (!atot(p, &pw->pw_change))
 167                 return (0);
 168         warnx("illegal date for change field");
 169         return (1);
 170 }
 171
 172 /* ARGSUSED */
 173 int
 174 p_expire(char *p, struct passwd *pw, ENTRY *ep)
 175 {
 176         if (!atot(p, &pw->pw_expire))
 177                 return (0);
 178         warnx("illegal date for expire field");
 179         return (1);
 180 }
 181
 182 /* ARGSUSED */
 183 int
 184 p_gecos(char *p, struct passwd *pw, ENTRY *ep)
 185 {
 186         if (!*p)
 187                 ep->save = "";
 188         else if (!(ep->save = strdup(p))) {
 189                 warnx("can't save entry");
 190                 return (1);
 191         }
 192         return (0);
 193 }
 194
 195 /* ARGSUSED */
 196 int
 197 p_hdir(char *p, struct passwd *pw, ENTRY *ep)
 198 {
 199         if (!*p) {
 200                 warnx("empty home directory field");
 201                 return (1);
 202         }
 203         if (!(pw->pw_dir = strdup(p))) {
 204                 warnx("can't save entry");
 205                 return (1);
 206         }
 207         return (0);
 208 }
 209
 210 /* ARGSUSED */
 211 int
 212 p_shell(char *p, struct passwd *pw, ENTRY *ep)
 213 {
 214         char *t, *ok_shell();
 215         struct stat sbuf;
 216
 217         if (!*p) {
 218                 pw->pw_shell = _PATH_BSHELL;
 219                 return (0);
 220         }
 221         /* only admin can change from or to "restricted" shells */
 222         if (uid && pw->pw_shell && !ok_shell(pw->pw_shell)) {
 223                 warnx("%s: current shell non-standard", pw->pw_shell);
 224                 return (1);
 225         }
 226         if (!(t = ok_shell(p))) {
 227                 if (uid) {
 228                         warnx("%s: non-standard shell", p);
 229                         return (1);
 230                 }
 231         }
 232         else
 233                 p = t;
 234         if (!(pw->pw_shell = strdup(p))) {
 235                 warnx("can't save entry");
 236                 return (1);
 237         }
 238         if (stat(pw->pw_shell, &sbuf) < 0) {
 239                 if (errno == ENOENT)
 240                         warnx("WARNING: shell '%s' does not exist",
 241                             pw->pw_shell);
 242                 else
 243                         warn("WARNING: can't stat shell '%s'",  pw->pw_shell);
 244                 return (0);
 245         }
 246         if (!S_ISREG(sbuf.st_mode)) {
 247                 warnx("WARNING: shell '%s' is not a regular file",
 248                         pw->pw_shell);
 249                 return (0);
 250         }
 251         if ((sbuf.st_mode & (S_IXOTH | S_IXGRP | S_IXUSR)) == 0) {
 252                 warnx("WARNING: shell '%s' is not executable", pw->pw_shell);
 253                 return (0);
 254         }
 255         return (0);
 256 }