lib/libc/gen/pw_scan.c

   1 /*      $NetBSD: pw_scan.c,v 1.23 2012/03/13 21:13:36 christos Exp $    */
   2
   3 /*
   4  * Copyright (c) 1987, 1993, 1994, 1995
   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 #if HAVE_NBTOOL_CONFIG_H
  33 #include "nbtool_config.h"
  34 #include "compat_pwd.h"
  35
  36 #else
  37 #include <sys/cdefs.h>
  38 #if defined(LIBC_SCCS) && !defined(lint)
  39 __RCSID("$NetBSD: pw_scan.c,v 1.23 2012/03/13 21:13:36 christos Exp $");
  40 #endif /* LIBC_SCCS and not lint */
  41
  42 #if defined(_LIBC)
  43 #include "namespace.h"
  44 #endif
  45 #include <sys/types.h>
  46
  47 #include <assert.h>
  48 #include <err.h>
  49 #include <limits.h>
  50 #include <pwd.h>
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54 #include <unistd.h>
  55 #include <errno.h>
  56
  57 #ifdef _LIBC
  58 #include "pw_private.h"
  59 #endif
  60 #endif /* ! HAVE_NBTOOL_CONFIG_H */
  61
  62 static int
  63 gettime(time_t *res, const char *p, int *flags, int dowarn, int flag)
  64 {
  65         long long l;
  66         char *ep;
  67         const char *vp;
  68
  69         if (*p == '\0') {
  70                 *flags |= flag;
  71                 *res = 0;
  72                 return 1;
  73         }
  74         l = strtoll(p, &ep, 0);
  75         if (p == ep || *ep != '\0') {
  76                 vp = "Invalid number";
  77                 goto done;
  78         }
  79         if (errno == ERANGE && (l == LLONG_MAX || l == LLONG_MIN)) {
  80                 vp = strerror(errno);
  81                 goto done;
  82         }
  83         _DIAGASSERT(__type_fit(time_t, l));
  84         *res = (time_t)l;
  85         return 1;
  86 done:
  87         if (dowarn) {
  88                 warnx("%s `%s' for %s time", vp, p,
  89                     flag == _PASSWORD_NOEXP ? "expiration" : "change");
  90         }
  91         return 0;
  92
  93 }
  94
  95 static int
  96 getid(unsigned long *res, const char *p, int *flags, int dowarn, int flag)
  97 {
  98         unsigned long ul;
  99         char *ep;
 100
 101         if (*p == '\0') {
 102                 *flags |= flag;
 103                 *res = 0;
 104                 return 1;
 105         }
 106         ul = strtoul(p, &ep, 0);
 107         if (p == ep || *ep != '\0') {
 108                 ep = __UNCONST("Invalid number");
 109                 goto done;
 110         }
 111         if (errno == ERANGE && ul == ULONG_MAX) {
 112                 ep = strerror(errno);
 113                 goto done;
 114         }
 115         if (ul > *res) {
 116                 ep = strerror(ERANGE);
 117                 goto done;
 118         }
 119
 120         *res = ul;
 121         return 1;
 122 done:
 123         if (dowarn)
 124                 warnx("%s %s `%s'", ep,
 125                     flag == _PASSWORD_NOUID ? "uid" : "gid", p);
 126         return 0;
 127
 128 }
 129
 130 int
 131 #ifdef _LIBC
 132 __pw_scan(char *bp, struct passwd *pw, int *flags)
 133 #else
 134 pw_scan( char *bp, struct passwd *pw, int *flags)
 135 #endif
 136 {
 137         unsigned long id;
 138         time_t ti;
 139         int root, inflags;
 140         int dowarn;
 141         const char *p, *sh;
 142
 143         _DIAGASSERT(bp != NULL);
 144         _DIAGASSERT(pw != NULL);
 145
 146         if (flags) {
 147                 inflags = *flags;
 148                 *flags = 0;
 149         } else {
 150                 inflags = 0;
 151                 flags = &inflags;
 152         }
 153         dowarn = !(inflags & _PASSWORD_NOWARN);
 154
 155         if (!(pw->pw_name = strsep(&bp, ":")))          /* login */
 156                 goto fmt;
 157         if (strlen(pw->pw_name) > (LOGIN_NAME_MAX - 1)) {
 158                 if (dowarn)
 159                         warnx("username too long, `%s' > %d", pw->pw_name,
 160                             LOGIN_NAME_MAX - 1);
 161                 return 0;
 162         }
 163
 164         root = !strcmp(pw->pw_name, "root");
 165
 166         if (!(pw->pw_passwd = strsep(&bp, ":")))        /* passwd */
 167                 goto fmt;
 168
 169         if (!(p = strsep(&bp, ":")))                    /* uid */
 170                 goto fmt;
 171
 172         id = UID_MAX;
 173         if (!getid(&id, p, flags, dowarn, _PASSWORD_NOUID))
 174                 return 0;
 175
 176         if (root && id) {
 177                 if (dowarn)
 178                         warnx("root uid should be 0");
 179                 return 0;
 180         }
 181
 182         pw->pw_uid = (uid_t)id;
 183
 184         if (!(p = strsep(&bp, ":")))                    /* gid */
 185                 goto fmt;
 186
 187         id = GID_MAX;
 188         if (!getid(&id, p, flags, dowarn, _PASSWORD_NOGID))
 189                 return 0;
 190
 191         pw->pw_gid = (gid_t)id;
 192
 193         if (inflags & _PASSWORD_OLDFMT) {
 194                 pw->pw_class = __UNCONST("");
 195                 pw->pw_change = 0;
 196                 pw->pw_expire = 0;
 197                 *flags |= (_PASSWORD_NOCHG | _PASSWORD_NOEXP);
 198         } else {
 199                 pw->pw_class = strsep(&bp, ":");        /* class */
 200                 if (!(p = strsep(&bp, ":")))            /* change */
 201                         goto fmt;
 202                 if (!gettime(&ti, p, flags, dowarn, _PASSWORD_NOCHG))
 203                         return 0;
 204                 pw->pw_change = ti;
 205
 206                 if (!(p = strsep(&bp, ":")))            /* expire */
 207                         goto fmt;
 208                 if (!gettime(&ti, p, flags, dowarn, _PASSWORD_NOEXP))
 209                         return 0;
 210                 pw->pw_expire = ti;
 211         }
 212
 213         pw->pw_gecos = strsep(&bp, ":");                /* gecos */
 214         pw->pw_dir = strsep(&bp, ":");                  /* directory */
 215         if (!(pw->pw_shell = strsep(&bp, ":")))         /* shell */
 216                 goto fmt;
 217
 218 #if ! HAVE_NBTOOL_CONFIG_H
 219         p = pw->pw_shell;
 220         if (root && *p)                                 /* empty == /bin/sh */
 221                 for (setusershell();;) {
 222                         if (!(sh = getusershell())) {
 223                                 if (dowarn)
 224                                         warnx("warning, unknown root shell");
 225                                 break;
 226                         }
 227                         if (!strcmp(p, sh))
 228                                 break;
 229                 }
 230 #endif
 231
 232         if ((p = strsep(&bp, ":")) != NULL) {                   /* too many */
 233 fmt:
 234                 if (dowarn)
 235                         warnx("corrupted entry");
 236                 return 0;
 237         }
 238
 239         return 1;
 240 }