lib/libcompat/4.3/ruserpass.c

   1 /*      $NetBSD: ruserpass.c,v 1.9 2003/08/07 16:44:16 agc Exp $        */
   2
   3 /*
   4  * Copyright (c) 1985, 1993, 1994
   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 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 #if 0
  35 static char sccsid[] = "@(#)ruserpass.c 8.4 (Berkeley) 4/27/95";
  36 #else
  37 __RCSID("$NetBSD: ruserpass.c,v 1.9 2003/08/07 16:44:16 agc Exp $");
  38 #endif
  39 #endif /* LIBC_SCCS and not lint */
  40
  41 #include <sys/types.h>
  42 #include <sys/stat.h>
  43 #include <sys/param.h>
  44
  45 #include <assert.h>
  46 #include <ctype.h>
  47 #include <err.h>
  48 #include <errno.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52 #include <unistd.h>
  53
  54 struct macel {
  55         char mac_name[9];       /* macro name */
  56         char *mac_start;        /* start of macro in macbuf */
  57         char *mac_end;          /* end of macro in macbuf */
  58 };
  59
  60 static  int token __P((void));
  61 static  FILE *cfile;
  62 static  int macnum;             /* number of defined macros */
  63 static  struct macel macros[16];
  64 static  char macbuf[4096];
  65
  66 #define DEFAULT 1
  67 #define LOGIN   2
  68 #define PASSWD  3
  69 #define ACCOUNT 4
  70 #define MACDEF  5
  71 #define ID      10
  72 #define MACH    11
  73
  74 static char tokval[100];
  75
  76 static struct toktab {
  77         char *tokstr;
  78         int tval;
  79 } toktab[]= {
  80         { "default",    DEFAULT },
  81         { "login",      LOGIN },
  82         { "password",   PASSWD },
  83         { "passwd",     PASSWD },
  84         { "account",    ACCOUNT },
  85         { "machine",    MACH },
  86         { "macdef",     MACDEF },
  87         { NULL,         0 }
  88 };
  89
  90 int ruserpass __P((const char *, char **, char **));
  91
  92 int
  93 ruserpass(host, aname, apass)
  94         const char *host;
  95         char **aname, **apass;
  96 {
  97         char *hdir, buf[BUFSIZ], *tmp;
  98         char myname[MAXHOSTNAMELEN + 1], *mydomain;
  99         int t, i, c, usedefault = 0;
 100         struct stat stb;
 101
 102         _DIAGASSERT(host != NULL);
 103         _DIAGASSERT(aname != NULL);
 104         _DIAGASSERT(apass != NULL);
 105
 106         hdir = getenv("HOME");
 107         if (hdir == NULL)
 108                 hdir = ".";
 109         if (strlen(hdir) + sizeof(".netrc") < sizeof(buf)) {
 110                 (void)snprintf(buf, sizeof buf, "%s/.netrc", hdir);
 111         } else {
 112                 warnx("%s/.netrc: %s", hdir, strerror(ENAMETOOLONG));
 113                 return (0);
 114         }
 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         else
 124                 myname[sizeof(myname) - 1] = '\0';
 125         if ((mydomain = strchr(myname, '.')) == NULL)
 126                 mydomain = "";
 127 next:
 128         while ((t = token()) != 0) switch(t) {
 129
 130         case DEFAULT:
 131                 usedefault = 1;
 132                 /* FALLTHROUGH */
 133
 134         case MACH:
 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 ((tmp = strchr(host, '.')) != NULL &&
 146                             strcasecmp(tmp, mydomain) == 0 &&
 147                             strncasecmp(host, tokval,
 148                             (size_t)(tmp - host)) == 0 &&
 149                             tokval[tmp - host] == '\0')
 150                                 goto match;
 151                         continue;
 152                 }
 153         match:
 154                 while ((t = token()) && t != MACH && t != DEFAULT) switch(t) {
 155
 156                 case LOGIN:
 157                         if (token()) {
 158                                 if (*aname == NULL) {
 159                                         *aname = strdup(tokval);
 160                                         if (*aname == NULL)
 161                                                 err(1, "can't strdup *aname");
 162                                 } else {
 163                                         if (strcmp(*aname, tokval))
 164                                                 goto next;
 165                                 }
 166                         }
 167                         break;
 168                 case PASSWD:
 169                         if ((*aname == NULL || strcmp(*aname, "anonymous")) &&
 170                             fstat(fileno(cfile), &stb) >= 0 &&
 171                             (stb.st_mode & 077) != 0) {
 172         warnx("Error: .netrc file is readable by others.");
 173         warnx("Remove password or make file unreadable by others.");
 174                                 goto bad;
 175                         }
 176                         if (token() && *apass == NULL) {
 177                                 *apass = strdup(tokval);
 178                                 if (*apass == NULL)
 179                                         err(1, "can't strdup *apass");
 180                         }
 181                         break;
 182                 case ACCOUNT:
 183                         if (fstat(fileno(cfile), &stb) >= 0
 184                             && (stb.st_mode & 077) != 0) {
 185         warnx("Error: .netrc file is readable by others.");
 186         warnx("Remove account or make file unreadable by others.");
 187                                 goto bad;
 188                         }
 189                         break;
 190                 case MACDEF:
 191                         while ((c=getc(cfile)) != EOF)
 192                                 if (c != ' ' && c != '\t')
 193                                         break;
 194                         if (c == EOF || c == '\n') {
 195                                 puts("Missing macdef name argument.");
 196                                 goto bad;
 197                         }
 198                         if (macnum == 16) {
 199                                 puts(
 200 "Limit of 16 macros have already been defined.");
 201                                 goto bad;
 202                         }
 203                         tmp = macros[macnum].mac_name;
 204                         *tmp++ = c;
 205                         for (i=0; i < 8 && (c=getc(cfile)) != EOF &&
 206                             !isspace(c); ++i) {
 207                                 *tmp++ = c;
 208                         }
 209                         if (c == EOF) {
 210                                 puts(
 211 "Macro definition missing null line terminator.");
 212                                 goto bad;
 213                         }
 214                         *tmp = '\0';
 215                         if (c != '\n') {
 216                                 while ((c=getc(cfile)) != EOF && c != '\n');
 217                         }
 218                         if (c == EOF) {
 219                                 puts(
 220 "Macro definition missing null line terminator.");
 221                                 goto bad;
 222                         }
 223                         if (macnum == 0) {
 224                                 macros[macnum].mac_start = macbuf;
 225                         }
 226                         else {
 227                                 macros[macnum].mac_start =
 228                                     macros[macnum-1].mac_end + 1;
 229                         }
 230                         tmp = macros[macnum].mac_start;
 231                         while (tmp != macbuf + 4096) {
 232                                 if ((c=getc(cfile)) == EOF) {
 233                                 puts(
 234 "Macro definition missing null line terminator.");
 235                                         goto bad;
 236                                 }
 237                                 *tmp = c;
 238                                 if (*tmp == '\n') {
 239                                         if (*(tmp-1) == '\0') {
 240                                            macros[macnum++].mac_end = tmp - 1;
 241                                            break;
 242                                         }
 243                                         *tmp = '\0';
 244                                 }
 245                                 tmp++;
 246                         }
 247                         if (tmp == macbuf + 4096) {
 248                                 puts("4K macro buffer exceeded.");
 249                                 goto bad;
 250                         }
 251                         break;
 252                 default:
 253                         warnx("Unknown .netrc keyword %s", tokval);
 254                         break;
 255                 }
 256                 goto done;
 257         }
 258 done:
 259         (void)fclose(cfile);
 260         return (0);
 261 bad:
 262         (void)fclose(cfile);
 263         return (-1);
 264 }
 265
 266 static int
 267 token()
 268 {
 269         char *cp;
 270         int c;
 271         struct toktab *t;
 272
 273         if (feof(cfile) || ferror(cfile))
 274                 return (0);
 275         while ((c = getc(cfile)) != EOF &&
 276             (c == '\n' || c == '\t' || c == ' ' || c == ','))
 277                 continue;
 278         if (c == EOF)
 279                 return (0);
 280         cp = tokval;
 281         if (c == '"') {
 282                 while ((c = getc(cfile)) != EOF && c != '"') {
 283                         if (c == '\\')
 284                                 c = getc(cfile);
 285                         *cp++ = c;
 286                 }
 287         } else {
 288                 *cp++ = c;
 289                 while ((c = getc(cfile)) != EOF
 290                     && c != '\n' && c != '\t' && c != ' ' && c != ',') {
 291                         if (c == '\\')
 292                                 c = getc(cfile);
 293                         *cp++ = c;
 294                 }
 295         }
 296         *cp = 0;
 297         if (tokval[0] == 0)
 298                 return (0);
 299         for (t = toktab; t->tokstr; t++)
 300                 if (!strcmp(t->tokstr, tokval))
 301                         return (t->tval);
 302         return (ID);
 303 }