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ruserpass.c

/*
 * Copyright (c) 1985, 1993, 1994
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)ruserpass.c   8.3 (Berkeley) 4/2/94";
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <netdb.h>
#include <stdio.h>
#include <stdio_ext.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <libintl.h>

/* #include "ftp_var.h" */

static      int token (void);
static      FILE *cfile;

#define     DEFAULT     1
#define     LOGIN 2
#define     PASSWD      3
#define     ACCOUNT 4
#define MACDEF  5
#define     ID    10
#define     MACHINE     11

static char tokval[100];

static const char tokstr[] =
{
#define TOK_DEFAULT_IDX 0
  "default\0"
#define TOK_LOGIN_IDX   (TOK_DEFAULT_IDX + sizeof "default")
  "login\0"
#define TOK_PASSWORD_IDX (TOK_LOGIN_IDX + sizeof "login")
  "password\0"
#define TOK_PASSWD_IDX  (TOK_PASSWORD_IDX + sizeof "password")
  "passwd\0"
#define TOK_ACCOUNT_IDX (TOK_PASSWD_IDX + sizeof "passwd")
  "account\0"
#define TOK_MACHINE_IDX (TOK_ACCOUNT_IDX + sizeof "account")
  "machine\0"
#define TOK_MACDEF_IDX  (TOK_MACHINE_IDX + sizeof "machine")
  "macdef"
};

static const struct toktab {
      int tokstr_off;
      int tval;
} toktab[]= {
      { TOK_DEFAULT_IDX,      DEFAULT },
      { TOK_LOGIN_IDX,  LOGIN },
      { TOK_PASSWORD_IDX,     PASSWD },
      { TOK_PASSWD_IDX, PASSWD },
      { TOK_ACCOUNT_IDX,      ACCOUNT },
      { TOK_MACHINE_IDX,      MACHINE },
      { TOK_MACDEF_IDX, MACDEF }
};



int
ruserpass(host, aname, apass)
      const char *host, **aname, **apass;
{
      char *hdir, *buf, *tmp;
      char myname[1024], *mydomain;
      int t, usedefault = 0;
      struct stat64 stb;

      hdir = __secure_getenv("HOME");
      if (hdir == NULL) {
            /* If we can't get HOME, fail instead of trying ".",
               which is no improvement. This really should call
               getpwuid(getuid()).  */
            /*hdir = ".";*/
            return -1;
      }

      buf = alloca (strlen (hdir) + 8);

      __stpcpy (__stpcpy (buf, hdir), "/.netrc");
      cfile = fopen(buf, "r");
      if (cfile == NULL) {
            if (errno != ENOENT)
                  warn("%s", buf);
            return (0);
      }
      /* No threads use this stream.  */
      __fsetlocking (cfile, FSETLOCKING_BYCALLER);
      if (__gethostname(myname, sizeof(myname)) < 0)
            myname[0] = '\0';
      mydomain = __strchrnul(myname, '.');
next:
      while ((t = token())) switch(t) {

      case DEFAULT:
            usedefault = 1;
            /* FALL THROUGH */

      case MACHINE:
            if (!usedefault) {
                  if (token() != ID)
                        continue;
                  /*
                   * Allow match either for user's input host name
                   * or official hostname.  Also allow match of
                   * incompletely-specified host in local domain.
                   */
                  if (__strcasecmp(host, tokval) == 0)
                        goto match;
/*                if (__strcasecmp(hostname, tokval) == 0)
                        goto match;
                  if ((tmp = strchr(hostname, '.')) != NULL &&
                      __strcasecmp(tmp, mydomain) == 0 &&
                      __strncasecmp(hostname, tokval, tmp-hostname) == 0 &&
                      tokval[tmp - hostname] == '\0')
                        goto match; */
                  if ((tmp = strchr(host, '.')) != NULL &&
                      __strcasecmp(tmp, mydomain) == 0 &&
                      __strncasecmp(host, tokval, tmp - host) == 0 &&
                      tokval[tmp - host] == '\0')
                        goto match;
                  continue;
            }
      match:
            while ((t = token()) && t != MACHINE && t != DEFAULT) switch(t) {

            case LOGIN:
                  if (token()) {
                        if (*aname == 0) {
                          char *newp;
                          newp = malloc((unsigned) strlen(tokval) + 1);
                          if (newp == NULL)
                            {
                              warnx(_("out of memory"));
                              goto bad;
                            }
                          *aname = strcpy(newp, tokval);
                        } else {
                              if (strcmp(*aname, tokval))
                                    goto next;
                        }
                  }
                  break;
            case PASSWD:
                  if (strcmp(*aname, "anonymous") &&
                      fstat64(fileno(cfile), &stb) >= 0 &&
                      (stb.st_mode & 077) != 0) {
      warnx(_("Error: .netrc file is readable by others."));
      warnx(_("Remove password or make file unreadable by others."));
                        goto bad;
                  }
                  if (token() && *apass == 0) {
                        char *newp;
                        newp = malloc((unsigned) strlen(tokval) + 1);
                        if (newp == NULL)
                          {
                            warnx(_("out of memory"));
                            goto bad;
                          }
                        *apass = strcpy(newp, tokval);
                  }
                  break;
            case ACCOUNT:
#if 0
                  if (fstat64(fileno(cfile), &stb) >= 0
                      && (stb.st_mode & 077) != 0) {
      warnx("Error: .netrc file is readable by others.");
      warnx("Remove account or make file unreadable by others.");
                        goto bad;
                  }
                  if (token() && *aacct == 0) {
                        *aacct = malloc((unsigned) strlen(tokval) + 1);
                        (void) strcpy(*aacct, tokval);
                  }
#endif
                  break;
            case MACDEF:
#if 0
                  if (proxy) {
                        (void) fclose(cfile);
                        return (0);
                  }
                  while ((c=getc_unlocked(cfile)) != EOF && c == ' '
                         || c == '\t');
                  if (c == EOF || c == '\n') {
                        printf("Missing macdef name argument.\n");
                        goto bad;
                  }
                  if (macnum == 16) {
                        printf("Limit of 16 macros have already been defined\n");
                        goto bad;
                  }
                  tmp = macros[macnum].mac_name;
                  *tmp++ = c;
                  for (i=0; i < 8 && (c=getc_unlocked(cfile)) != EOF &&
                      !isspace(c); ++i) {
                        *tmp++ = c;
                  }
                  if (c == EOF) {
                        printf("Macro definition missing null line terminator.\n");
                        goto bad;
                  }
                  *tmp = '\0';
                  if (c != '\n') {
                        while ((c=getc_unlocked(cfile)) != EOF
                               && c != '\n');
                  }
                  if (c == EOF) {
                        printf("Macro definition missing null line terminator.\n");
                        goto bad;
                  }
                  if (macnum == 0) {
                        macros[macnum].mac_start = macbuf;
                  }
                  else {
                        macros[macnum].mac_start = macros[macnum-1].mac_end + 1;
                  }
                  tmp = macros[macnum].mac_start;
                  while (tmp != macbuf + 4096) {
                        if ((c=getc_unlocked(cfile)) == EOF) {
                        printf("Macro definition missing null line terminator.\n");
                              goto bad;
                        }
                        *tmp = c;
                        if (*tmp == '\n') {
                              if (*(tmp-1) == '\0') {
                                 macros[macnum++].mac_end = tmp - 1;
                                 break;
                              }
                              *tmp = '\0';
                        }
                        tmp++;
                  }
                  if (tmp == macbuf + 4096) {
                        printf("4K macro buffer exceeded\n");
                        goto bad;
                  }
#endif
                  break;
            default:
                  warnx(_("Unknown .netrc keyword %s"), tokval);
                  break;
            }
            goto done;
      }
done:
      (void) fclose(cfile);
      return (0);
bad:
      (void) fclose(cfile);
      return (-1);
}
libc_hidden_def (ruserpass)

static int
token()
{
      char *cp;
      int c;
      int i;

      if (feof_unlocked(cfile) || ferror_unlocked(cfile))
            return (0);
      while ((c = getc_unlocked(cfile)) != EOF &&
          (c == '\n' || c == '\t' || c == ' ' || c == ','))
            continue;
      if (c == EOF)
            return (0);
      cp = tokval;
      if (c == '"') {
            while ((c = getc_unlocked(cfile)) != EOF && c != '"') {
                  if (c == '\\')
                        c = getc_unlocked(cfile);
                  *cp++ = c;
            }
      } else {
            *cp++ = c;
            while ((c = getc_unlocked(cfile)) != EOF
                && c != '\n' && c != '\t' && c != ' ' && c != ',') {
                  if (c == '\\')
                        c = getc_unlocked(cfile);
                  *cp++ = c;
            }
      }
      *cp = 0;
      if (tokval[0] == 0)
            return (0);
      for (i = 0; i < (int) (sizeof (toktab) / sizeof (toktab[0])); ++i)
            if (!strcmp(&tokstr[toktab[i].tokstr_off], tokval))
                  return toktab[i].tval;
      return (ID);
}

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