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 #if defined(LIBC_SCCS) && !defined(lint)
  31 static char sccsid[] = "@(#)ruserpass.c 8.3 (Berkeley) 4/2/94";
  32 #endif /* not lint */
  33
  34 #include <sys/types.h>
  35 #include <sys/stat.h>
  36
  37 #include <ctype.h>
  38 #include <err.h>
  39 #include <errno.h>
  40 #include <netdb.h>
  41 #include <stdio.h>
  42 #include <stdio_ext.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <unistd.h>
  46 #include <libintl.h>
  47
  48 /* #include "ftp_var.h" */
  49
  50 static  int token (void);
  51 static  FILE *cfile;
  52
  53 #define DEFAULT 1
  54 #define LOGIN   2
  55 #define PASSWD  3
  56 #define ACCOUNT 4
  57 #define MACDEF  5
  58 #define ID      10
  59 #define MACHINE 11
  60
  61 static char tokval[100];
  62
  63 static const char tokstr[] =
  64 {
  65 #define TOK_DEFAULT_IDX 0
  66   "default\0"
  67 #define TOK_LOGIN_IDX   (TOK_DEFAULT_IDX + sizeof "default")
  68   "login\0"
  69 #define TOK_PASSWORD_IDX (TOK_LOGIN_IDX + sizeof "login")
  70   "password\0"
  71 #define TOK_PASSWD_IDX  (TOK_PASSWORD_IDX + sizeof "password")
  72   "passwd\0"
  73 #define TOK_ACCOUNT_IDX (TOK_PASSWD_IDX + sizeof "passwd")
  74   "account\0"
  75 #define TOK_MACHINE_IDX (TOK_ACCOUNT_IDX + sizeof "account")
  76   "machine\0"
  77 #define TOK_MACDEF_IDX  (TOK_MACHINE_IDX + sizeof "machine")
  78   "macdef"
  79 };
  80
  81 static const struct toktab {
  82         int tokstr_off;
  83         int tval;
  84 } toktab[]= {
  85         { TOK_DEFAULT_IDX,      DEFAULT },
  86         { TOK_LOGIN_IDX,        LOGIN },
  87         { TOK_PASSWORD_IDX,     PASSWD },
  88         { TOK_PASSWD_IDX,       PASSWD },
  89         { TOK_ACCOUNT_IDX,      ACCOUNT },
  90         { TOK_MACHINE_IDX,      MACHINE },
  91         { TOK_MACDEF_IDX,       MACDEF }
  92 };
  93
  94
  95
  96 int
  97 ruserpass (const char *host, const char **aname, const char **apass)
  98 {
  99         char *hdir, *buf, *tmp;
 100         char myname[1024], *mydomain;
 101         int t, usedefault = 0;
 102         struct stat64 stb;
 103
 104         hdir = __libc_secure_getenv("HOME");
 105         if (hdir == NULL) {
 106                 /* If we can't get HOME, fail instead of trying ".",
 107                    which is no improvement. This really should call
 108                    getpwuid(getuid()).  */
 109                 /*hdir = ".";*/
 110                 return -1;
 111         }
 112
 113         buf = alloca (strlen (hdir) + 8);
 114
 115         __stpcpy (__stpcpy (buf, hdir), "/.netrc");
 116         cfile = fopen(buf, "rce");
 117         if (cfile == NULL) {
 118                 if (errno != ENOENT)
 119                         warn("%s", buf);
 120                 return (0);
 121         }
 122         /* No threads use this stream.  */
 123         __fsetlocking (cfile, FSETLOCKING_BYCALLER);
 124         if (__gethostname(myname, sizeof(myname)) < 0)
 125                 myname[0] = '\0';
 126         mydomain = __strchrnul(myname, '.');
 127 next:
 128         while ((t = token())) switch(t) {
 129
 130         case DEFAULT:
 131                 usedefault = 1;
 132                 /* FALL THROUGH */
 133
 134         case MACHINE:
 135                 if (!usedefault) {
 136                         if (token() != ID)
 137                                 continue;
 138                         /*
 139                          * Allow match either for user's input host name
 140                          * or official hostname.  Also allow match of
 141                          * incompletely-specified host in local domain.
 142                          */
 143                         if (__strcasecmp(host, tokval) == 0)
 144                                 goto match;
 145 /*                      if (__strcasecmp(hostname, tokval) == 0)
 146                                 goto match;
 147                         if ((tmp = strchr(hostname, '.')) != NULL &&
 148                             __strcasecmp(tmp, mydomain) == 0 &&
 149                             __strncasecmp(hostname, tokval, tmp-hostname) == 0 &&
 150                             tokval[tmp - hostname] == '\0')
 151                                 goto match; */
 152                         if ((tmp = strchr(host, '.')) != NULL &&
 153                             __strcasecmp(tmp, mydomain) == 0 &&
 154                             __strncasecmp(host, tokval, tmp - host) == 0 &&
 155                             tokval[tmp - host] == '\0')
 156                                 goto match;
 157                         continue;
 158                 }
 159         match:
 160                 while ((t = token()) && t != MACHINE && t != DEFAULT) switch(t) {
 161
 162                 case LOGIN:
 163                         if (token()) {
 164                                 if (*aname == 0) {
 165                                   char *newp;
 166                                   newp = malloc((unsigned) strlen(tokval) + 1);
 167                                   if (newp == NULL)
 168                                     {
 169                                       warnx(_("out of memory"));
 170                                       goto bad;
 171                                     }
 172                                   *aname = strcpy(newp, tokval);
 173                                 } else {
 174                                         if (strcmp(*aname, tokval))
 175                                                 goto next;
 176                                 }
 177                         }
 178                         break;
 179                 case PASSWD:
 180                         if (strcmp(*aname, "anonymous") &&
 181                             fstat64(fileno(cfile), &stb) >= 0 &&
 182                             (stb.st_mode & 077) != 0) {
 183         warnx(_("Error: .netrc file is readable by others."));
 184         warnx(_("Remove password or make file unreadable by others."));
 185                                 goto bad;
 186                         }
 187                         if (token() && *apass == 0) {
 188                                 char *newp;
 189                                 newp = malloc((unsigned) strlen(tokval) + 1);
 190                                 if (newp == NULL)
 191                                   {
 192                                     warnx(_("out of memory"));
 193                                     goto bad;
 194                                   }
 195                                 *apass = strcpy(newp, tokval);
 196                         }
 197                         break;
 198                 case ACCOUNT:
 199 #if 0
 200                         if (fstat64(fileno(cfile), &stb) >= 0
 201                             && (stb.st_mode & 077) != 0) {
 202         warnx("Error: .netrc file is readable by others.");
 203         warnx("Remove account or make file unreadable by others.");
 204                                 goto bad;
 205                         }
 206                         if (token() && *aacct == 0) {
 207                                 *aacct = malloc((unsigned) strlen(tokval) + 1);
 208                                 (void) strcpy(*aacct, tokval);
 209                         }
 210 #endif
 211                         break;
 212                 case MACDEF:
 213 #if 0
 214                         if (proxy) {
 215                                 (void) fclose(cfile);
 216                                 return (0);
 217                         }
 218                         while ((c=getc_unlocked(cfile)) != EOF && c == ' '
 219                                || c == '\t');
 220                         if (c == EOF || c == '\n') {
 221                                 printf("Missing macdef name argument.\n");
 222                                 goto bad;
 223                         }
 224                         if (macnum == 16) {
 225                                 printf("Limit of 16 macros have already been defined\n");
 226                                 goto bad;
 227                         }
 228                         tmp = macros[macnum].mac_name;
 229                         *tmp++ = c;
 230                         for (i=0; i < 8 && (c=getc_unlocked(cfile)) != EOF &&
 231                             !isspace(c); ++i) {
 232                                 *tmp++ = c;
 233                         }
 234                         if (c == EOF) {
 235                                 printf("Macro definition missing null line terminator.\n");
 236                                 goto bad;
 237                         }
 238                         *tmp = '\0';
 239                         if (c != '\n') {
 240                                 while ((c=getc_unlocked(cfile)) != EOF
 241                                        && c != '\n');
 242                         }
 243                         if (c == EOF) {
 244                                 printf("Macro definition missing null line terminator.\n");
 245                                 goto bad;
 246                         }
 247                         if (macnum == 0) {
 248                                 macros[macnum].mac_start = macbuf;
 249                         }
 250                         else {
 251                                 macros[macnum].mac_start = macros[macnum-1].mac_end + 1;
 252                         }
 253                         tmp = macros[macnum].mac_start;
 254                         while (tmp != macbuf + 4096) {
 255                                 if ((c=getc_unlocked(cfile)) == EOF) {
 256                                 printf("Macro definition missing null line terminator.\n");
 257                                         goto bad;
 258                                 }
 259                                 *tmp = c;
 260                                 if (*tmp == '\n') {
 261                                         if (*(tmp-1) == '\0') {
 262                                            macros[macnum++].mac_end = tmp - 1;
 263                                            break;
 264                                         }
 265                                         *tmp = '\0';
 266                                 }
 267                                 tmp++;
 268                         }
 269                         if (tmp == macbuf + 4096) {
 270                                 printf("4K macro buffer exceeded\n");
 271                                 goto bad;
 272                         }
 273 #endif
 274                         break;
 275                 default:
 276                         warnx(_("Unknown .netrc keyword %s"), tokval);
 277                         break;
 278                 }
 279                 goto done;
 280         }
 281 done:
 282         (void) fclose(cfile);
 283         return (0);
 284 bad:
 285         (void) fclose(cfile);
 286         return (-1);
 287 }
 288 libc_hidden_def (ruserpass)
 289
 290 static int
 291 token (void)
 292 {
 293         char *cp;
 294         int c;
 295         int i;
 296
 297         if (feof_unlocked(cfile) || ferror_unlocked(cfile))
 298                 return (0);
 299         while ((c = getc_unlocked(cfile)) != EOF &&
 300             (c == '\n' || c == '\t' || c == ' ' || c == ','))
 301                 continue;
 302         if (c == EOF)
 303                 return (0);
 304         cp = tokval;
 305         if (c == '"') {
 306                 while ((c = getc_unlocked(cfile)) != EOF && c != '"') {
 307                         if (c == '\\')
 308                                 c = getc_unlocked(cfile);
 309                         *cp++ = c;
 310                 }
 311         } else {
 312                 *cp++ = c;
 313                 while ((c = getc_unlocked(cfile)) != EOF
 314                     && c != '\n' && c != '\t' && c != ' ' && c != ',') {
 315                         if (c == '\\')
 316                                 c = getc_unlocked(cfile);
 317                         *cp++ = c;
 318                 }
 319         }
 320         *cp = 0;
 321         if (tokval[0] == 0)
 322                 return (0);
 323         for (i = 0; i < (int) (sizeof (toktab) / sizeof (toktab[0])); ++i)
 324                 if (!strcmp(&tokstr[toktab[i].tokstr_off], tokval))
 325                         return toktab[i].tval;
 326         return (ID);
 327 }