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Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11005 * Password authentication. This file contains the functions to check whether
6 * the password is valid for the user.
Damien Millere4340be2000-09-16 13:29:08 +11007 *
8 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
13 *
Damien Millere4340be2000-09-16 13:29:08 +110014 * Copyright (c) 1999 Dug Song. All rights reserved.
Damien Millere4340be2000-09-16 13:29:08 +110015 * Copyright (c) 2000 Markus Friedl. All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
19 * are met:
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Damien Miller95def091999-11-25 00:26:21 +110036 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100037
38#include "includes.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000039RCSID("$OpenBSD: auth-passwd.c,v 1.20 2001/01/21 19:05:42 markus Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100040
Damien Millerb8c656e2000-06-28 15:22:41 +100041#if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
42
Damien Millerd4a8b7e1999-10-27 13:42:43 +100043#include "packet.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100044#include "xmalloc.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000045#include "log.h"
46#include "servconf.h"
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000047#include "auth.h"
48
Damien Miller1fa154b2000-01-23 10:32:03 +110049#ifdef WITH_AIXAUTHENTICATE
Damien Miller1bead332000-04-30 00:47:29 +100050# include <login.h>
Damien Miller1fa154b2000-01-23 10:32:03 +110051#endif
Damien Miller8a1e6a62000-09-16 15:55:52 +110052#ifdef __hpux
Damien Miller1bead332000-04-30 00:47:29 +100053# include <hpsecurity.h>
54# include <prot.h>
55#endif
Damien Miller78315eb2000-09-29 23:01:36 +110056#ifdef HAVE_SCO_PROTECTED_PW
57# include <sys/security.h>
58# include <sys/audit.h>
59# include <prot.h>
60#endif /* HAVE_SCO_PROTECTED_PW */
Damien Miller8a1e6a62000-09-16 15:55:52 +110061#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
Damien Millerbeb4ba51999-12-28 15:09:35 +110062# include <shadow.h>
Damien Miller2cb210f1999-11-13 15:40:10 +110063#endif
Damien Miller8a1e6a62000-09-16 15:55:52 +110064#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
Damien Millerdfc83f42000-05-20 15:02:59 +100065# include <sys/label.h>
66# include <sys/audit.h>
67# include <pwdadj.h>
68#endif
Damien Millerbeb4ba51999-12-28 15:09:35 +110069#if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
70# include "md5crypt.h"
71#endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */
Damien Millerdd1c7ba1999-11-19 15:53:20 +110072
Damien Millerbac2d8a2000-09-05 16:13:06 +110073#ifdef HAVE_CYGWIN
74#undef ERROR
75#include <windows.h>
76#include <sys/cygwin.h>
77#define is_winnt (GetVersion() < 0x80000000)
78#endif
79
Damien Miller95def091999-11-25 00:26:21 +110080/*
81 * Tries to authenticate the user using password. Returns true if
82 * authentication succeeds.
83 */
Damien Miller4af51302000-04-16 11:18:38 +100084int
Damien Miller95def091999-11-25 00:26:21 +110085auth_password(struct passwd * pw, const char *password)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100086{
Damien Miller95def091999-11-25 00:26:21 +110087 extern ServerOptions options;
88 char *encrypted_password;
Damien Miller2e1b0821999-12-25 10:11:29 +110089 char *pw_password;
90 char *salt;
Damien Miller8a1e6a62000-09-16 15:55:52 +110091#ifdef __hpux
92 struct pr_passwd *spw;
93#endif
Damien Miller78315eb2000-09-29 23:01:36 +110094#ifdef HAVE_SCO_PROTECTED_PW
95 struct pr_passwd *spw;
96#endif /* HAVE_SCO_PROTECTED_PW */
Damien Miller8a1e6a62000-09-16 15:55:52 +110097#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
Damien Miller95def091999-11-25 00:26:21 +110098 struct spwd *spw;
Damien Miller2cb210f1999-11-13 15:40:10 +110099#endif
Damien Miller8a1e6a62000-09-16 15:55:52 +1100100#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
Damien Millerdfc83f42000-05-20 15:02:59 +1000101 struct passwd_adjunct *spw;
102#endif
Damien Miller1fa154b2000-01-23 10:32:03 +1100103#ifdef WITH_AIXAUTHENTICATE
104 char *authmsg;
105 char *loginmsg;
106 int reenter = 1;
107#endif
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000108
Damien Millerece22a81999-12-30 09:48:15 +1100109 /* deny if no user. */
110 if (pw == NULL)
111 return 0;
Damien Millerbac2d8a2000-09-05 16:13:06 +1100112#ifndef HAVE_CYGWIN
Damien Miller5428f641999-11-25 11:54:57 +1100113 if (pw->pw_uid == 0 && options.permit_root_login == 2)
Damien Miller95def091999-11-25 00:26:21 +1100114 return 0;
Damien Millerbac2d8a2000-09-05 16:13:06 +1100115#endif
116#ifdef HAVE_CYGWIN
117 /*
118 * Empty password is only possible on NT if the user has _really_
119 * an empty password and authentication is done, though.
120 */
Kevin Stevesef4eea92001-02-05 12:42:17 +0000121 if (!is_winnt)
Damien Millerbac2d8a2000-09-05 16:13:06 +1100122#endif
Damien Miller5428f641999-11-25 11:54:57 +1100123 if (*password == '\0' && options.permit_empty_passwd == 0)
Damien Miller95def091999-11-25 00:26:21 +1100124 return 0;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000125
Damien Millerbac2d8a2000-09-05 16:13:06 +1100126#ifdef HAVE_CYGWIN
127 if (is_winnt) {
128 HANDLE hToken = cygwin_logon_user(pw, password);
129
130 if (hToken == INVALID_HANDLE_VALUE)
131 return 0;
132 cygwin_set_impersonation_token(hToken);
133 return 1;
134 }
135#endif
136
Damien Miller1fa154b2000-01-23 10:32:03 +1100137#ifdef WITH_AIXAUTHENTICATE
138 return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
139#endif
140
Damien Milleraae6c611999-12-06 11:47:28 +1100141#ifdef KRB4
142 if (options.kerberos_authentication == 1) {
143 int ret = auth_krb4_password(pw, password);
144 if (ret == 1 || ret == 0)
145 return ret;
Damien Miller95def091999-11-25 00:26:21 +1100146 /* Fall back to ordinary passwd authentication. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000147 }
Damien Milleraae6c611999-12-06 11:47:28 +1100148#endif
Damien Miller95def091999-11-25 00:26:21 +1100149
Damien Miller8a1e6a62000-09-16 15:55:52 +1100150
Damien Miller2e1b0821999-12-25 10:11:29 +1100151 pw_password = pw->pw_passwd;
Damien Miller606f8802000-09-16 15:39:56 +1100152
Damien Miller8a1e6a62000-09-16 15:55:52 +1100153 /*
154 * Various interfaces to shadow or protected password data
155 */
Damien Millercb7e5f91999-12-21 21:03:09 +1100156#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
Damien Miller95def091999-11-25 00:26:21 +1100157 spw = getspnam(pw->pw_name);
Kevin Stevesef4eea92001-02-05 12:42:17 +0000158 if (spw != NULL)
Damien Miller8eb0fd61999-12-31 08:49:13 +1100159 pw_password = spw->sp_pwdp;
Damien Millercb7e5f91999-12-21 21:03:09 +1100160#endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
Damien Miller78315eb2000-09-29 23:01:36 +1100161
162#ifdef HAVE_SCO_PROTECTED_PW
163 spw = getprpwnam(pw->pw_name);
Kevin Stevesef4eea92001-02-05 12:42:17 +0000164 if (spw != NULL)
Damien Miller78315eb2000-09-29 23:01:36 +1100165 pw_password = spw->ufld.fd_encrypt;
166#endif /* HAVE_SCO_PROTECTED_PW */
167
Damien Millerdfc83f42000-05-20 15:02:59 +1000168#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
169 if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL)
Damien Millerdfc83f42000-05-20 15:02:59 +1000170 pw_password = spw->pwa_passwd;
Damien Millerdfc83f42000-05-20 15:02:59 +1000171#endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */
Damien Miller78315eb2000-09-29 23:01:36 +1100172
Damien Miller8a1e6a62000-09-16 15:55:52 +1100173#if defined(__hpux)
174 if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL)
175 pw_password = spw->ufld.fd_encrypt;
176#endif /* defined(__hpux) */
177
178 /* Check for users with no password. */
179 if ((password[0] == '\0') && (pw_password[0] == '\0'))
180 return 1;
Damien Miller2e1b0821999-12-25 10:11:29 +1100181
182 if (pw_password[0] != '\0')
183 salt = pw_password;
184 else
185 salt = "xx";
186
187#ifdef HAVE_MD5_PASSWORDS
188 if (is_md5_salt(salt))
189 encrypted_password = md5_crypt(password, salt);
190 else
191 encrypted_password = crypt(password, salt);
Kevin Stevesef4eea92001-02-05 12:42:17 +0000192#else /* HAVE_MD5_PASSWORDS */
Damien Miller8a1e6a62000-09-16 15:55:52 +1100193# ifdef __hpux
194 if (iscomsec())
195 encrypted_password = bigcrypt(password, salt);
196 else
197 encrypted_password = crypt(password, salt);
Damien Miller1bead332000-04-30 00:47:29 +1000198# else
Damien Miller2e1b0821999-12-25 10:11:29 +1100199 encrypted_password = crypt(password, salt);
Damien Miller8a1e6a62000-09-16 15:55:52 +1100200# endif /* __hpux */
Kevin Stevesef4eea92001-02-05 12:42:17 +0000201#endif /* HAVE_MD5_PASSWORDS */
Damien Miller2e1b0821999-12-25 10:11:29 +1100202
203 /* Authentication is accepted if the encrypted passwords are identical. */
204 return (strcmp(encrypted_password, pw_password) == 0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000205}
Damien Millerb8c656e2000-06-28 15:22:41 +1000206#endif /* !USE_PAM && !HAVE_OSF_SIA */