243 lines
7.4 KiB
C
243 lines
7.4 KiB
C
/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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* Password authentication. This file contains the functions to check whether
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* the password is valid for the user.
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*
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*
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* Copyright (c) 1999 Dug Song. All rights reserved.
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* Copyright (c) 2000 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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RCSID("$OpenBSD: auth-passwd.c,v 1.27 2002/05/24 16:45:16 stevesk Exp $");
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RCSID("$FreeBSD$");
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#include "packet.h"
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#include "log.h"
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#include "servconf.h"
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#include "auth.h"
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/*
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* Do not try to use PAM for password authentication, as it is
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* already (and far better) supported by the challenge/response
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* authentication mechanism.
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*/
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#undef USE_PAM
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#if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
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/* Don't need any of these headers for the PAM or SIA cases */
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# ifdef HAVE_CRYPT_H
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# include <crypt.h>
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# endif
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# ifdef WITH_AIXAUTHENTICATE
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# include <login.h>
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# endif
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# ifdef __hpux
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# include <hpsecurity.h>
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# include <prot.h>
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# endif
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# ifdef HAVE_SECUREWARE
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# include <sys/security.h>
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# include <sys/audit.h>
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# include <prot.h>
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# endif /* HAVE_SECUREWARE */
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# if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
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# include <shadow.h>
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# endif
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# if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
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# include <sys/label.h>
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# include <sys/audit.h>
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# include <pwdadj.h>
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# endif
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# if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
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# include "md5crypt.h"
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# endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */
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# ifdef HAVE_CYGWIN
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# undef ERROR
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# include <windows.h>
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# include <sys/cygwin.h>
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# define is_winnt (GetVersion() < 0x80000000)
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# endif
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#endif /* !USE_PAM && !HAVE_OSF_SIA */
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extern ServerOptions options;
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#ifdef WITH_AIXAUTHENTICATE
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extern char *aixloginmsg;
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#endif
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/*
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* Tries to authenticate the user using password. Returns true if
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* authentication succeeds.
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*/
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int
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auth_password(Authctxt *authctxt, const char *password)
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{
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struct passwd * pw = authctxt->pw;
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#if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
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char *encrypted_password;
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char *pw_password;
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char *salt;
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# if defined(__hpux) || defined(HAVE_SECUREWARE)
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struct pr_passwd *spw;
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# endif /* __hpux || HAVE_SECUREWARE */
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# if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
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struct spwd *spw;
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# endif
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# if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
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struct passwd_adjunct *spw;
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# endif
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# ifdef WITH_AIXAUTHENTICATE
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char *authmsg;
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int authsuccess;
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int reenter = 1;
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# endif
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#endif /* !defined(USE_PAM) && !defined(HAVE_OSF_SIA) */
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/* deny if no user. */
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if (pw == NULL)
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return 0;
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#ifndef HAVE_CYGWIN
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if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
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return 0;
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#endif
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if (*password == '\0' && options.permit_empty_passwd == 0)
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return 0;
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#if defined(USE_PAM)
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return auth_pam_password(authctxt, password);
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#elif defined(HAVE_OSF_SIA)
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return auth_sia_password(authctxt, password);
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#else
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# ifdef KRB5
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if (options.kerberos_authentication == 1) {
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int ret = auth_krb5_password(authctxt, password);
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if (ret == 1 || ret == 0)
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return ret;
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/* Fall back to ordinary passwd authentication. */
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}
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# endif
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# ifdef HAVE_CYGWIN
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if (is_winnt) {
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HANDLE hToken = cygwin_logon_user(pw, password);
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if (hToken == INVALID_HANDLE_VALUE)
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return 0;
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cygwin_set_impersonation_token(hToken);
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return 1;
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}
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# endif
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# ifdef WITH_AIXAUTHENTICATE
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authsuccess = (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
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if (authsuccess)
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/* We don't have a pty yet, so just label the line as "ssh" */
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if (loginsuccess(authctxt->user,
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get_canonical_hostname(options.verify_reverse_mapping),
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"ssh", &aixloginmsg) < 0)
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aixloginmsg = NULL;
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return(authsuccess);
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# endif
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# ifdef KRB4
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if (options.kerberos_authentication == 1) {
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int ret = auth_krb4_password(authctxt, password);
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if (ret == 1 || ret == 0)
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return ret;
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/* Fall back to ordinary passwd authentication. */
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}
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# endif
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# ifdef BSD_AUTH
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if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
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(char *)password) == 0)
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return 0;
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else
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return 1;
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# endif
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pw_password = pw->pw_passwd;
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/*
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* Various interfaces to shadow or protected password data
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*/
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# if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
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spw = getspnam(pw->pw_name);
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if (spw != NULL)
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pw_password = spw->sp_pwdp;
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# endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
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# if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
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if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL)
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pw_password = spw->pwa_passwd;
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# endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */
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# ifdef HAVE_SECUREWARE
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if ((spw = getprpwnam(pw->pw_name)) != NULL)
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pw_password = spw->ufld.fd_encrypt;
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# endif /* HAVE_SECUREWARE */
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# if defined(__hpux) && !defined(HAVE_SECUREWARE)
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if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL)
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pw_password = spw->ufld.fd_encrypt;
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# endif /* defined(__hpux) && !defined(HAVE_SECUREWARE) */
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/* Check for users with no password. */
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if ((password[0] == '\0') && (pw_password[0] == '\0'))
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return 1;
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if (pw_password[0] != '\0')
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salt = pw_password;
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else
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salt = "xx";
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# ifdef HAVE_MD5_PASSWORDS
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if (is_md5_salt(salt))
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encrypted_password = md5_crypt(password, salt);
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else
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encrypted_password = crypt(password, salt);
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# else /* HAVE_MD5_PASSWORDS */
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# if defined(__hpux) && !defined(HAVE_SECUREWARE)
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if (iscomsec())
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encrypted_password = bigcrypt(password, salt);
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else
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encrypted_password = crypt(password, salt);
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# else
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# ifdef HAVE_SECUREWARE
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encrypted_password = bigcrypt(password, salt);
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# else
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encrypted_password = crypt(password, salt);
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# endif /* HAVE_SECUREWARE */
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# endif /* __hpux && !defined(HAVE_SECUREWARE) */
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# endif /* HAVE_MD5_PASSWORDS */
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/* Authentication is accepted if the encrypted passwords are identical. */
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return (strcmp(encrypted_password, pw_password) == 0);
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#endif /* !USE_PAM && !HAVE_OSF_SIA */
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}
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