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