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
  34 #ifndef lint
  35 static char sccsid[] = "@(#)field.c     8.4 (Berkeley) 4/2/94";
  36 #endif /* not lint */
  37
  38 #include <sys/param.h>
  39 #include <sys/stat.h>
  40
  41 #include <ctype.h>
  42 #include <err.h>
  43 #include <errno.h>
  44 #include <grp.h>
  45 #include <pwd.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <unistd.h>
  50
  51 #include "chpass.h"
  52 #include "pathnames.h"
  53
  54 /* ARGSUSED */
  55 int
  56 p_login(p, pw, ep)
  57         char *p;
  58         struct passwd *pw;
  59         ENTRY *ep;
  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(*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(p, pw, ep)
  86         char *p;
  87         struct passwd *pw;
  88         ENTRY *ep;
  89 {
  90         if (!*p)
  91                 pw->pw_passwd = "";     /* "NOLOGIN"; */
  92         else if (!(pw->pw_passwd = strdup(p))) {
  93                 warnx("can't save password entry");
  94                 return (1);
  95         }
  96
  97         return (0);
  98 }
  99
 100 /* ARGSUSED */
 101 int
 102 p_uid(p, pw, ep)
 103         char *p;
 104         struct passwd *pw;
 105         ENTRY *ep;
 106 {
 107         uid_t id;
 108         char *np;
 109
 110         if (!*p) {
 111                 warnx("empty uid field");
 112                 return (1);
 113         }
 114         if (!isdigit(*p)) {
 115                 warnx("illegal uid");
 116                 return (1);
 117         }
 118         errno = 0;
 119         id = strtoul(p, &np, 10);
 120         if (*np || (id == ULONG_MAX && errno == ERANGE)) {
 121                 warnx("illegal uid");
 122                 return (1);
 123         }
 124         pw->pw_uid = id;
 125         return (0);
 126 }
 127
 128 /* ARGSUSED */
 129 int
 130 p_gid(p, pw, ep)
 131         char *p;
 132         struct passwd *pw;
 133         ENTRY *ep;
 134 {
 135         struct group *gr;
 136         gid_t id;
 137         char *np;
 138
 139         if (!*p) {
 140                 warnx("empty gid field");
 141                 return (1);
 142         }
 143         if (!isdigit(*p)) {
 144                 if (!(gr = getgrnam(p))) {
 145                         warnx("unknown group %s", p);
 146                         return (1);
 147                 }
 148                 pw->pw_gid = gr->gr_gid;
 149                 return (0);
 150         }
 151         errno = 0;
 152         id = strtoul(p, &np, 10);
 153         if (*np || (id == ULONG_MAX && errno == ERANGE)) {
 154                 warnx("illegal gid");
 155                 return (1);
 156         }
 157         pw->pw_gid = id;
 158         return (0);
 159 }
 160
 161 /* ARGSUSED */
 162 int
 163 p_class(p, pw, ep)
 164         char *p;
 165         struct passwd *pw;
 166         ENTRY *ep;
 167 {
 168         if (!*p)
 169                 pw->pw_class = "";
 170         else if (!(pw->pw_class = strdup(p))) {
 171                 warnx("can't save entry");
 172                 return (1);
 173         }
 174
 175         return (0);
 176 }
 177
 178 /* ARGSUSED */
 179 int
 180 p_change(p, pw, ep)
 181         char *p;
 182         struct passwd *pw;
 183         ENTRY *ep;
 184 {
 185         if (!atot(p, &pw->pw_change))
 186                 return (0);
 187         warnx("illegal date for change field");
 188         return (1);
 189 }
 190
 191 /* ARGSUSED */
 192 int
 193 p_expire(p, pw, ep)
 194         char *p;
 195         struct passwd *pw;
 196         ENTRY *ep;
 197 {
 198         if (!atot(p, &pw->pw_expire))
 199                 return (0);
 200         warnx("illegal date for expire field");
 201         return (1);
 202 }
 203
 204 /* ARGSUSED */
 205 int
 206 p_gecos(p, pw, ep)
 207         char *p;
 208         struct passwd *pw;
 209         ENTRY *ep;
 210 {
 211         if (!*p)
 212                 ep->save = "";
 213         else if (!(ep->save = strdup(p))) {
 214                 warnx("can't save entry");
 215                 return (1);
 216         }
 217         return (0);
 218 }
 219
 220 /* ARGSUSED */
 221 int
 222 p_hdir(p, pw, ep)
 223         char *p;
 224         struct passwd *pw;
 225         ENTRY *ep;
 226 {
 227         if (!*p) {
 228                 warnx("empty home directory field");
 229                 return (1);
 230         }
 231         if (!(pw->pw_dir = strdup(p))) {
 232                 warnx("can't save entry");
 233                 return (1);
 234         }
 235         return (0);
 236 }
 237
 238 /* ARGSUSED */
 239 int
 240 p_shell(p, pw, ep)
 241         char *p;
 242         struct passwd *pw;
 243         ENTRY *ep;
 244 {
 245         char *t, *ok_shell();
 246         struct stat sbuf;
 247
 248         if (!*p) {
 249                 pw->pw_shell = _PATH_BSHELL;
 250                 return (0);
 251         }
 252         /* only admin can change from or to "restricted" shells */
 253         if (uid && pw->pw_shell && !ok_shell(pw->pw_shell)) {
 254                 warnx("%s: current shell non-standard", pw->pw_shell);
 255                 return (1);
 256         }
 257         if (!(t = ok_shell(p))) {
 258                 if (uid) {
 259                         warnx("%s: non-standard shell", p);
 260                         return (1);
 261                 }
 262         }
 263         else
 264                 p = t;
 265         if (!(pw->pw_shell = strdup(p))) {
 266                 warnx("can't save entry");
 267                 return (1);
 268         }
 269         if (stat(pw->pw_shell, &sbuf) < 0) {
 270                 if (errno == ENOENT)
 271                         warnx("WARNING: shell '%s' does not exist",
 272                             pw->pw_shell);
 273                 else
 274                         warn("WARNING: can't stat shell '%s'",  pw->pw_shell);
 275                 return (0);
 276         }
 277         if (!S_ISREG(sbuf.st_mode)) {
 278                 warnx("WARNING: shell '%s' is not a regular file",
 279                         pw->pw_shell);
 280                 return (0);
 281         }
 282         if ((sbuf.st_mode & (S_IXOTH | S_IXGRP | S_IXUSR)) == 0) {
 283                 warnx("WARNING: shell '%s' is not executable", pw->pw_shell);
 284                 return (0);
 285         }
 286         return (0);
 287 }