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