text: /*
   * Copyright (c) 1999-2005, 2010-2013 Todd C. Miller <Todd.Miller@courtesan.com>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   *
   * Sponsored in part by the Defense Advanced Research Projects
   * Agency (DARPA) and Air Force Research Laboratory, Air Force
   * Materiel Command, USAF, under agreement number F39502-99-1-0512.
   */
  
  #include <config.h>
  
  #include <sys/types.h>
  #include <stdio.h>
  #ifdef STDC_HEADERS
  # include <stdlib.h>
  # include <stddef.h>
  #else
  # ifdef HAVE_STDLIB_H
  #  include <stdlib.h>
  # endif
  #endif /* STDC_HEADERS */
  #ifdef HAVE_STRING_H
  # include <string.h>
  #endif /* HAVE_STRING_H */
  #ifdef HAVE_STRINGS_H
  # include <strings.h>
  #endif /* HAVE_STRINGS_H */
  #ifdef HAVE_UNISTD_H
  # include <unistd.h>
  #endif /* HAVE_UNISTD_H */
  #include <pwd.h>
  
  #include "sudoers.h"
  #include "sudo_auth.h"
  
  #define DESLEN			13
  #define HAS_AGEINFO(p, l)	(l == 18 && p[DESLEN] == ',')
  
  int
  sudo_passwd_init(struct passwd *pw, sudo_auth *auth)
  {
      debug_decl(sudo_passwd_init, SUDO_DEBUG_AUTH)
  
  #ifdef HAVE_SKEYACCESS
      if (skeyaccess(pw, user_tty, NULL, NULL) == 0)
  	debug_return_int(AUTH_FAILURE);
  #endif
      sudo_setspent();
      auth->data = sudo_getepw(pw);
      sudo_endspent();
      debug_return_int(AUTH_SUCCESS);
  }
  
  int
  sudo_passwd_verify(struct passwd *pw, char *pass, sudo_auth *auth)
  {
      char sav, *epass;
      char *pw_epasswd = auth->data;
      size_t pw_len;
      int matched = 0;
      debug_decl(sudo_passwd_verify, SUDO_DEBUG_AUTH)
  
      pw_len = strlen(pw_epasswd);
  
  #ifdef HAVE_GETAUTHUID
      /* Ultrix shadow passwords may use crypt16() */
      epass = (char *) crypt16(pass, pw_epasswd);
      if (epass != NULL && strcmp(pw_epasswd, epass) == 0)
  	debug_return_int(AUTH_SUCCESS);
  #endif /* HAVE_GETAUTHUID */
  
      /*
       * Truncate to 8 chars if standard DES since not all crypt()'s do this.
       * If this turns out not to be safe we will have to use OS #ifdef's (sigh).
       */
      sav = pass[8];
      if (pw_len == DESLEN || HAS_AGEINFO(pw_epasswd, pw_len))
  	pass[8] = '\0';
  
      /*
       * Normal UN*X password check.
       * HP-UX may add aging info (separated by a ',') at the end so
       * only compare the first DESLEN characters in that case.
       */
      epass = (char *) crypt(pass, pw_epasswd);
      pass[8] = sav;
      if (epass != NULL) {
  	if (HAS_AGEINFO(pw_epasswd, pw_len) && strlen(epass) == DESLEN)
  	    matched = !strncmp(pw_epasswd, epass, DESLEN);
  	else
  	    matched = !strcmp(pw_epasswd, epass);
      }
  
      debug_return_int(matched ? AUTH_SUCCESS : AUTH_FAILURE);
  }
  
  int
  sudo_passwd_cleanup(pw, auth)
      struct passwd *pw;
      sudo_auth *auth;
  {
      char *pw_epasswd = auth->data;
      debug_decl(sudo_passwd_cleanup, SUDO_DEBUG_AUTH)
  
      if (pw_epasswd != NULL) {
  	memset_s(pw_epasswd, SUDO_CONV_REPL_MAX, 0, strlen(pw_epasswd));
  	efree(pw_epasswd);
      }
      debug_return_int(AUTH_SUCCESS);
  }
  