/* * Author: Tatu Ylonen * Copyright (c) 1995 Tatu Ylonen , Espoo, Finland * All rights reserved * Password authentication. This file contains the functions to check whether * the password is valid for the user. * * As far as I am concerned, the code I have written for this software * can be used freely for any purpose. Any derived versions of this * software must be clearly marked as such, and if the derived work is * incompatible with the protocol description in the RFC file, it must be * called by a name other than "ssh" or "Secure Shell". * * Copyright (c) 1999 Dug Song. All rights reserved. * Copyright (c) 2000 Markus Friedl. 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. */ #include "includes.h" RCSID("$OpenBSD: auth-passwd.c,v 1.27 2002/05/24 16:45:16 stevesk Exp $"); #include "packet.h" #include "log.h" #include "servconf.h" #include "auth.h" #if !defined(USE_PAM) && !defined(HAVE_OSF_SIA) /* Don't need any of these headers for the PAM or SIA cases */ # ifdef HAVE_CRYPT_H # include # endif # ifdef WITH_AIXAUTHENTICATE # include # endif # ifdef __hpux # include # include # endif # if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) # include # endif # if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) # include # include # include # endif # if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) # include "md5crypt.h" # endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */ # ifdef HAVE_CYGWIN # undef ERROR # include # include # define is_winnt (GetVersion() < 0x80000000) # endif #endif /* !USE_PAM && !HAVE_OSF_SIA */ extern ServerOptions options; #ifdef WITH_AIXAUTHENTICATE extern char *aixloginmsg; #endif /* * Tries to authenticate the user using password. Returns true if * authentication succeeds. */ int auth_password(Authctxt *authctxt, const char *password) { #if defined(USE_PAM) if (*password == '\0' && options.permit_empty_passwd == 0) return 0; return auth_pam_password(authctxt, password); #elif defined(HAVE_OSF_SIA) if (*password == '\0' && options.permit_empty_passwd == 0) return 0; return auth_sia_password(authctxt, password); #else struct passwd * pw = authctxt->pw; char *encrypted_password; char *pw_password; char *salt; #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) struct spwd *spw; #endif #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) struct passwd_adjunct *spw; #endif #ifdef WITH_AIXAUTHENTICATE char *authmsg; int authsuccess; int reenter = 1; #endif /* deny if no user. */ if (pw == NULL) return 0; #ifndef HAVE_CYGWIN if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES) return 0; #endif if (*password == '\0' && options.permit_empty_passwd == 0) return 0; #ifdef KRB5 if (options.kerberos_authentication == 1) { int ret = auth_krb5_password(authctxt, password); if (ret == 1 || ret == 0) return ret; /* Fall back to ordinary passwd authentication. */ } #endif #ifdef HAVE_CYGWIN if (is_winnt) { HANDLE hToken = cygwin_logon_user(pw, password); if (hToken == INVALID_HANDLE_VALUE) return 0; cygwin_set_impersonation_token(hToken); return 1; } #endif #ifdef WITH_AIXAUTHENTICATE authsuccess = (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0); if (authsuccess) /* We don't have a pty yet, so just label the line as "ssh" */ if (loginsuccess(authctxt->user, get_canonical_hostname(options.verify_reverse_mapping), "ssh", &aixloginmsg) < 0) aixloginmsg = NULL; return(authsuccess); #endif #ifdef KRB4 if (options.kerberos_authentication == 1) { int ret = auth_krb4_password(authctxt, password); if (ret == 1 || ret == 0) return ret; /* Fall back to ordinary passwd authentication. */ } #endif #ifdef BSD_AUTH if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh", (char *)password) == 0) return 0; else return 1; #endif pw_password = pw->pw_passwd; /* * Various interfaces to shadow or protected password data */ #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) spw = getspnam(pw->pw_name); if (spw != NULL) pw_password = spw->sp_pwdp; #endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */ #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL) pw_password = spw->pwa_passwd; #endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */ /* Check for users with no password. */ if ((password[0] == '\0') && (pw_password[0] == '\0')) return 1; if (pw_password[0] != '\0') salt = pw_password; else salt = "xx"; #ifdef HAVE_MD5_PASSWORDS if (is_md5_salt(salt)) encrypted_password = md5_crypt(password, salt); else encrypted_password = crypt(password, salt); #else /* HAVE_MD5_PASSWORDS */ encrypted_password = crypt(password, salt); #endif /* HAVE_MD5_PASSWORDS */ /* Authentication is accepted if the encrypted passwords are identical. */ return (strcmp(encrypted_password, pw_password) == 0); #endif /* !USE_PAM && !HAVE_OSF_SIA */ }