inet/ruserpass.c

   1 /*
   2  * Copyright (c) 1985, 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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32
  33 #include <ctype.h>
  34 #include <err.h>
  35 #include <errno.h>
  36 #include <netdb.h>
  37 #include <stdio.h>
  38 #include <stdio_ext.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <unistd.h>
  42 #include <libintl.h>
  43
  44 /* #include "ftp_var.h" */
  45
  46 static  int token (void);
  47 static  FILE *cfile;
  48
  49 #define DEFAULT 1
  50 #define LOGIN   2
  51 #define PASSWD  3
  52 #define ACCOUNT 4
  53 #define MACDEF  5
  54 #define ID      10
  55 #define MACHINE 11
  56
  57 static char tokval[100];
  58
  59 static const char tokstr[] =
  60 {
  61 #define TOK_DEFAULT_IDX 0
  62   "default\0"
  63 #define TOK_LOGIN_IDX   (TOK_DEFAULT_IDX + sizeof "default")
  64   "login\0"
  65 #define TOK_PASSWORD_IDX (TOK_LOGIN_IDX + sizeof "login")
  66   "password\0"
  67 #define TOK_PASSWD_IDX  (TOK_PASSWORD_IDX + sizeof "password")
  68   "passwd\0"
  69 #define TOK_ACCOUNT_IDX (TOK_PASSWD_IDX + sizeof "passwd")
  70   "account\0"
  71 #define TOK_MACHINE_IDX (TOK_ACCOUNT_IDX + sizeof "account")
  72   "machine\0"
  73 #define TOK_MACDEF_IDX  (TOK_MACHINE_IDX + sizeof "machine")
  74   "macdef"
  75 };
  76
  77 static const struct toktab {
  78         int tokstr_off;
  79         int tval;
  80 } toktab[]= {
  81         { TOK_DEFAULT_IDX,      DEFAULT },
  82         { TOK_LOGIN_IDX,        LOGIN },
  83         { TOK_PASSWORD_IDX,     PASSWD },
  84         { TOK_PASSWD_IDX,       PASSWD },
  85         { TOK_ACCOUNT_IDX,      ACCOUNT },
  86         { TOK_MACHINE_IDX,      MACHINE },
  87         { TOK_MACDEF_IDX,       MACDEF }
  88 };
  89
  90
  91
  92 int
  93 ruserpass (const char *host, const char **aname, const char **apass)
  94 {
  95         char *hdir, *buf, *tmp;
  96         char myname[1024], *mydomain;
  97         int t, usedefault = 0;
  98         struct stat64 stb;
  99
 100         hdir = __libc_secure_getenv("HOME");
 101         if (hdir == NULL) {
 102                 /* If we can't get HOME, fail instead of trying ".",
 103                    which is no improvement. This really should call
 104                    getpwuid(getuid()).  */
 105                 /*hdir = ".";*/
 106                 return -1;
 107         }
 108
 109         buf = alloca (strlen (hdir) + 8);
 110
 111         __stpcpy (__stpcpy (buf, hdir), "/.netrc");
 112         cfile = fopen(buf, "rce");
 113         if (cfile == NULL) {
 114                 if (errno != ENOENT)
 115                         warn("%s", buf);
 116                 return (0);
 117         }
 118         /* No threads use this stream.  */
 119         __fsetlocking (cfile, FSETLOCKING_BYCALLER);
 120         if (__gethostname(myname, sizeof(myname)) < 0)
 121                 myname[0] = '\0';
 122         mydomain = __strchrnul(myname, '.');
 123 next:
 124         while ((t = token())) switch(t) {
 125
 126         case DEFAULT:
 127                 usedefault = 1;
 128                 /* FALL THROUGH */
 129
 130         case MACHINE:
 131                 if (!usedefault) {
 132                         if (token() != ID)
 133                                 continue;
 134                         /*
 135                          * Allow match either for user's input host name
 136                          * or official hostname.  Also allow match of
 137                          * incompletely-specified host in local domain.
 138                          */
 139                         if (__strcasecmp(host, tokval) == 0)
 140                                 goto match;
 141 /*                      if (__strcasecmp(hostname, tokval) == 0)
 142                                 goto match;
 143                         if ((tmp = strchr(hostname, '.')) != NULL &&
 144                             __strcasecmp(tmp, mydomain) == 0 &&
 145                             __strncasecmp(hostname, tokval, tmp-hostname) == 0 &&
 146                             tokval[tmp - hostname] == '\0')
 147                                 goto match; */
 148                         if ((tmp = strchr(host, '.')) != NULL &&
 149                             __strcasecmp(tmp, mydomain) == 0 &&
 150                             __strncasecmp(host, tokval, tmp - host) == 0 &&
 151                             tokval[tmp - host] == '\0')
 152                                 goto match;
 153                         continue;
 154                 }
 155         match:
 156                 while ((t = token()) && t != MACHINE && t != DEFAULT) switch(t) {
 157
 158                 case LOGIN:
 159                         if (token()) {
 160                                 if (*aname == 0) {
 161                                   char *newp;
 162                                   newp = malloc((unsigned) strlen(tokval) + 1);
 163                                   if (newp == NULL)
 164                                     {
 165                                       warnx(_("out of memory"));
 166                                       goto bad;
 167                                     }
 168                                   *aname = strcpy(newp, tokval);
 169                                 } else {
 170                                         if (strcmp(*aname, tokval))
 171                                                 goto next;
 172                                 }
 173                         }
 174                         break;
 175                 case PASSWD:
 176                         if (strcmp(*aname, "anonymous") &&
 177                             fstat64(fileno(cfile), &stb) >= 0 &&
 178                             (stb.st_mode & 077) != 0) {
 179         warnx(_("Error: .netrc file is readable by others."));
 180         warnx(_("Remove 'password' line or make file unreadable by others."));
 181                                 goto bad;
 182                         }
 183                         if (token() && *apass == 0) {
 184                                 char *newp;
 185                                 newp = malloc((unsigned) strlen(tokval) + 1);
 186                                 if (newp == NULL)
 187                                   {
 188                                     warnx(_("out of memory"));
 189                                     goto bad;
 190                                   }
 191                                 *apass = strcpy(newp, tokval);
 192                         }
 193                         break;
 194                 case ACCOUNT:
 195                         break;
 196                 case MACDEF:
 197                         break;
 198                 default:
 199                         warnx(_("Unknown .netrc keyword %s"), tokval);
 200                         break;
 201                 }
 202                 goto done;
 203         }
 204 done:
 205         (void) fclose(cfile);
 206         return (0);
 207 bad:
 208         (void) fclose(cfile);
 209         return (-1);
 210 }
 211 libc_hidden_def (ruserpass)
 212
 213 static int
 214 token (void)
 215 {
 216         char *cp;
 217         int c;
 218         int i;
 219
 220         if (feof_unlocked(cfile) || ferror_unlocked(cfile))
 221                 return (0);
 222         while ((c = getc_unlocked(cfile)) != EOF &&
 223             (c == '\n' || c == '\t' || c == ' ' || c == ','))
 224                 continue;
 225         if (c == EOF)
 226                 return (0);
 227         cp = tokval;
 228         if (c == '"') {
 229                 while ((c = getc_unlocked(cfile)) != EOF && c != '"') {
 230                         if (c == '\\')
 231                                 c = getc_unlocked(cfile);
 232                         *cp++ = c;
 233                 }
 234         } else {
 235                 *cp++ = c;
 236                 while ((c = getc_unlocked(cfile)) != EOF
 237                     && c != '\n' && c != '\t' && c != ' ' && c != ',') {
 238                         if (c == '\\')
 239                                 c = getc_unlocked(cfile);
 240                         *cp++ = c;
 241                 }
 242         }
 243         *cp = 0;
 244         if (tokval[0] == 0)
 245                 return (0);
 246         for (i = 0; i < (int) (sizeof (toktab) / sizeof (toktab[0])); ++i)
 247                 if (!strcmp(&tokstr[toktab[i].tokstr_off], tokval))
 248                         return toktab[i].tval;
 249         return (ID);
 250 }