usr.bin/chpass/field.c

   1 /*      $NetBSD: field.c,v 1.12 2009/04/11 12:10:02 lukem Exp $ */
   2
   3 /*
   4  * Copyright (c) 1988, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)field.c     8.4 (Berkeley) 4/2/94";
  36 #else
  37 __RCSID("$NetBSD: field.c,v 1.12 2009/04/11 12:10:02 lukem Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <sys/param.h>
  42
  43 #include <ctype.h>
  44 #include <err.h>
  45 #include <errno.h>
  46 #include <grp.h>
  47 #include <pwd.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <unistd.h>
  52
  53 #include "chpass.h"
  54 #include "pathnames.h"
  55
  56 /* ARGSUSED */
  57 int
  58 p_login(const char *p, struct passwd *pw, ENTRY *ep)
  59 {
  60
  61         if (!*p) {
  62                 warnx("empty login field");
  63                 return (1);
  64         }
  65         if (*p == '-') {
  66                 warnx("login names may not begin with a hyphen");
  67                 return (1);
  68         }
  69         if (!(pw->pw_name = strdup(p))) {
  70                 warnx("can't save entry");
  71                 return (1);
  72         }
  73         if (strchr(p, '.'))
  74                 warnx("\'.\' is dangerous in a login name");
  75         for (; *p; ++p)
  76                 if (isupper((unsigned char)*p)) {
  77                         warnx("upper-case letters are dangerous in a login name");
  78                         break;
  79                 }
  80         return (0);
  81 }
  82
  83 /* ARGSUSED */
  84 int
  85 p_passwd(const char *p, struct passwd *pw, ENTRY *ep)
  86 {
  87
  88         if (!(pw->pw_passwd = strdup(p))) {
  89                 warnx("can't save password entry");
  90                 return (1);
  91         }
  92
  93         return (0);
  94 }
  95
  96 /* ARGSUSED */
  97 int
  98 p_uid(const char *p, struct passwd *pw, ENTRY *ep)
  99 {
 100         unsigned long id;
 101         char *np;
 102
 103         if (!*p) {
 104                 warnx("empty uid field");
 105                 return (1);
 106         }
 107         if (!isdigit((unsigned char)*p)) {
 108                 warnx("illegal uid");
 109                 return (1);
 110         }
 111         errno = 0;
 112         id = strtoul(p, &np, 10);
 113         /*
 114          * We don't need to check the return value of strtoul()
 115          * since ULONG_MAX is greater than UID_MAX.
 116          */
 117         if (*np || id > UID_MAX) {
 118                 warnx("illegal uid");
 119                 return (1);
 120         }
 121         pw->pw_uid = (uid_t)id;
 122         return (0);
 123 }
 124
 125 /* ARGSUSED */
 126 int
 127 p_gid(const char *p, struct passwd *pw, ENTRY *ep)
 128 {
 129         struct group *gr;
 130         unsigned long id;
 131         char *np;
 132
 133         if (!*p) {
 134                 warnx("empty gid field");
 135                 return (1);
 136         }
 137         if (!isdigit((unsigned char)*p)) {
 138                 if (!(gr = getgrnam(p))) {
 139                         warnx("unknown group %s", p);
 140                         return (1);
 141                 }
 142                 pw->pw_gid = gr->gr_gid;
 143                 return (0);
 144         }
 145         errno = 0;
 146         id = strtoul(p, &np, 10);
 147         /*
 148          * We don't need to check the return value of strtoul()
 149          * since ULONG_MAX is greater than GID_MAX.
 150          */
 151         if (*np || id > GID_MAX) {
 152                 warnx("illegal gid");
 153                 return (1);
 154         }
 155         pw->pw_gid = (gid_t)id;
 156         return (0);
 157 }
 158
 159 /* ARGSUSED */
 160 int
 161 p_class(const char *p, struct passwd *pw, ENTRY *ep)
 162 {
 163
 164         if (!(pw->pw_class = strdup(p))) {
 165                 warnx("can't save entry");
 166                 return (1);
 167         }
 168
 169         return (0);
 170 }
 171
 172 /* ARGSUSED */
 173 int
 174 p_change(const char *p, struct passwd *pw, ENTRY *ep)
 175 {
 176
 177         if (!atot(p, &pw->pw_change))
 178                 return (0);
 179         warnx("illegal date for change field");
 180         return (1);
 181 }
 182
 183 /* ARGSUSED */
 184 int
 185 p_expire(const char *p, struct passwd *pw, ENTRY *ep)
 186 {
 187
 188         if (!atot(p, &pw->pw_expire))
 189                 return (0);
 190         warnx("illegal date for expire field");
 191         return (1);
 192 }
 193
 194 /* ARGSUSED */
 195 int
 196 p_gecos(const char *p, struct passwd *pw, ENTRY *ep)
 197 {
 198
 199         if (!(ep->save = strdup(p))) {
 200                 warnx("can't save entry");
 201                 return (1);
 202         }
 203         return (0);
 204 }
 205
 206 /* ARGSUSED */
 207 int
 208 p_hdir(const char *p, struct passwd *pw, ENTRY *ep)
 209 {
 210
 211         if (!*p) {
 212                 warnx("empty home directory field");
 213                 return (1);
 214         }
 215         if (!(pw->pw_dir = strdup(p))) {
 216                 warnx("can't save entry");
 217                 return (1);
 218         }
 219         return (0);
 220 }
 221
 222 /* ARGSUSED */
 223 int
 224 p_shell(const char *p, struct passwd *pw, ENTRY *ep)
 225 {
 226         const char *t;
 227
 228         if (!*p) {
 229                 if (!(pw->pw_shell = strdup(_PATH_BSHELL))) {
 230                         warnx("can't save entry");
 231                         return (1);
 232                 }
 233                 return (0);
 234         }
 235         /* only admin can change from or to "restricted" shells */
 236         if (uid && pw->pw_shell && !ok_shell(pw->pw_shell)) {
 237                 warnx("%s: current shell non-standard", pw->pw_shell);
 238                 return (1);
 239         }
 240         if (!(t = ok_shell(p))) {
 241                 if (uid) {
 242                         warnx("%s: non-standard shell", p);
 243                         return (1);
 244                 }
 245         }
 246         else
 247                 p = t;
 248         if (!(pw->pw_shell = strdup(p))) {
 249                 warnx("can't save entry");
 250                 return (1);
 251         }
 252         return (0);
 253 }