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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"
Damien Miller444f9fc2002-06-21 16:05:12 +100039RCSID("$OpenBSD: auth-passwd.c,v 1.27 2002/05/24 16:45:16 stevesk Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100040
41#include "packet.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000042#include "log.h"
43#include "servconf.h"
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000044#include "auth.h"
45
Damien Miller4f9f42a2003-05-10 19:28:02 +100046#if !defined(HAVE_OSF_SIA)
47/* Don't need any of these headers for the SIA cases */
Kevin Stevese683e762002-04-04 19:02:28 +000048# ifdef HAVE_CRYPT_H
49# include <crypt.h>
50# endif
51# ifdef WITH_AIXAUTHENTICATE
52# include <login.h>
53# endif
54# ifdef __hpux
55# include <hpsecurity.h>
56# include <prot.h>
57# endif
Kevin Steves0ea1d9d2002-04-25 18:17:04 +000058# ifdef HAVE_SECUREWARE
Kevin Stevese683e762002-04-04 19:02:28 +000059# include <sys/security.h>
60# include <sys/audit.h>
61# include <prot.h>
Kevin Steves0ea1d9d2002-04-25 18:17:04 +000062# endif /* HAVE_SECUREWARE */
Kevin Stevese683e762002-04-04 19:02:28 +000063# if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
64# include <shadow.h>
65# endif
66# if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
67# include <sys/label.h>
68# include <sys/audit.h>
69# include <pwdadj.h>
70# endif
71# if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
72# include "md5crypt.h"
73# endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */
Damien Millerdd1c7ba1999-11-19 15:53:20 +110074
Kevin Stevese683e762002-04-04 19:02:28 +000075# ifdef HAVE_CYGWIN
76# undef ERROR
77# include <windows.h>
78# include <sys/cygwin.h>
79# define is_winnt (GetVersion() < 0x80000000)
80# endif
Damien Miller4f9f42a2003-05-10 19:28:02 +100081#endif /* !HAVE_OSF_SIA */
Damien Miller60396b02001-02-18 17:01:00 +110082
83extern ServerOptions options;
Ben Lindstrom164725f2002-09-25 23:14:14 +000084#ifdef WITH_AIXAUTHENTICATE
85extern char *aixloginmsg;
86#endif
Damien Miller60396b02001-02-18 17:01:00 +110087
Damien Miller95def091999-11-25 00:26:21 +110088/*
89 * Tries to authenticate the user using password. Returns true if
90 * authentication succeeds.
91 */
Damien Miller4af51302000-04-16 11:18:38 +100092int
Damien Miller60396b02001-02-18 17:01:00 +110093auth_password(Authctxt *authctxt, const char *password)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100094{
Ben Lindstrom0b478142002-05-10 02:40:15 +000095 struct passwd * pw = authctxt->pw;
Damien Millereab4bae2003-04-29 23:22:40 +100096 int ok = authctxt->valid;
Damien Miller4f9f42a2003-05-10 19:28:02 +100097#if !defined(HAVE_OSF_SIA)
Damien Miller95def091999-11-25 00:26:21 +110098 char *encrypted_password;
Damien Miller2e1b0821999-12-25 10:11:29 +110099 char *pw_password;
100 char *salt;
Damien Miller2101bfc2003-01-22 15:42:26 +1100101# if defined(__hpux) || defined(HAVE_SECUREWARE)
Damien Miller8a1e6a62000-09-16 15:55:52 +1100102 struct pr_passwd *spw;
Damien Miller2101bfc2003-01-22 15:42:26 +1100103# endif /* __hpux || HAVE_SECUREWARE */
104# if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
Damien Miller95def091999-11-25 00:26:21 +1100105 struct spwd *spw;
Damien Miller2101bfc2003-01-22 15:42:26 +1100106# endif
107# if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
Damien Millerdfc83f42000-05-20 15:02:59 +1000108 struct passwd_adjunct *spw;
Damien Miller2101bfc2003-01-22 15:42:26 +1100109# endif
110# ifdef WITH_AIXAUTHENTICATE
Damien Miller1fa154b2000-01-23 10:32:03 +1100111 char *authmsg;
Ben Lindstrom164725f2002-09-25 23:14:14 +0000112 int authsuccess;
Damien Miller1fa154b2000-01-23 10:32:03 +1100113 int reenter = 1;
Damien Miller2101bfc2003-01-22 15:42:26 +1100114# endif
Damien Miller4f9f42a2003-05-10 19:28:02 +1000115#endif /* !defined(HAVE_OSF_SIA) */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000116
Damien Millerece22a81999-12-30 09:48:15 +1100117 /* deny if no user. */
118 if (pw == NULL)
Damien Millereab4bae2003-04-29 23:22:40 +1000119 ok = 0;
Damien Millerbac2d8a2000-09-05 16:13:06 +1100120#ifndef HAVE_CYGWIN
Damien Millereab4bae2003-04-29 23:22:40 +1000121 if (pw && pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
122 ok = 0;
Damien Millerbac2d8a2000-09-05 16:13:06 +1100123#endif
Ben Lindstrom0b478142002-05-10 02:40:15 +0000124 if (*password == '\0' && options.permit_empty_passwd == 0)
Damien Millereab4bae2003-04-29 23:22:40 +1000125 ok = 0;
Damien Miller2101bfc2003-01-22 15:42:26 +1100126
Damien Miller4f9f42a2003-05-10 19:28:02 +1000127#if defined(HAVE_OSF_SIA)
Damien Millereab4bae2003-04-29 23:22:40 +1000128 if (!ok)
129 return 0;
Damien Miller2101bfc2003-01-22 15:42:26 +1100130 return auth_sia_password(authctxt, password);
131#else
Damien Millereab4bae2003-04-29 23:22:40 +1000132 if (!ok)
133 return 0;
Damien Miller2101bfc2003-01-22 15:42:26 +1100134# ifdef KRB5
Ben Lindstromec95ed92001-07-04 04:21:14 +0000135 if (options.kerberos_authentication == 1) {
136 int ret = auth_krb5_password(authctxt, password);
137 if (ret == 1 || ret == 0)
138 return ret;
139 /* Fall back to ordinary passwd authentication. */
140 }
Damien Miller2101bfc2003-01-22 15:42:26 +1100141# endif
142# ifdef HAVE_CYGWIN
Damien Millerbac2d8a2000-09-05 16:13:06 +1100143 if (is_winnt) {
144 HANDLE hToken = cygwin_logon_user(pw, password);
145
146 if (hToken == INVALID_HANDLE_VALUE)
147 return 0;
148 cygwin_set_impersonation_token(hToken);
149 return 1;
150 }
Damien Miller2101bfc2003-01-22 15:42:26 +1100151# endif
152# ifdef WITH_AIXAUTHENTICATE
Ben Lindstrom164725f2002-09-25 23:14:14 +0000153 authsuccess = (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
154
155 if (authsuccess)
156 /* We don't have a pty yet, so just label the line as "ssh" */
157 if (loginsuccess(authctxt->user,
158 get_canonical_hostname(options.verify_reverse_mapping),
159 "ssh", &aixloginmsg) < 0)
160 aixloginmsg = NULL;
161
162 return(authsuccess);
Damien Miller2101bfc2003-01-22 15:42:26 +1100163# endif
164# ifdef KRB4
Damien Milleraae6c611999-12-06 11:47:28 +1100165 if (options.kerberos_authentication == 1) {
Ben Lindstromec95ed92001-07-04 04:21:14 +0000166 int ret = auth_krb4_password(authctxt, password);
Damien Milleraae6c611999-12-06 11:47:28 +1100167 if (ret == 1 || ret == 0)
168 return ret;
Damien Miller95def091999-11-25 00:26:21 +1100169 /* Fall back to ordinary passwd authentication. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000170 }
Damien Miller2101bfc2003-01-22 15:42:26 +1100171# endif
172# ifdef BSD_AUTH
Ben Lindstromec95ed92001-07-04 04:21:14 +0000173 if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
174 (char *)password) == 0)
175 return 0;
176 else
177 return 1;
Damien Miller2101bfc2003-01-22 15:42:26 +1100178# endif
Damien Miller2e1b0821999-12-25 10:11:29 +1100179 pw_password = pw->pw_passwd;
Damien Miller606f8802000-09-16 15:39:56 +1100180
Damien Miller8a1e6a62000-09-16 15:55:52 +1100181 /*
182 * Various interfaces to shadow or protected password data
183 */
Damien Miller2101bfc2003-01-22 15:42:26 +1100184# if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
Damien Miller95def091999-11-25 00:26:21 +1100185 spw = getspnam(pw->pw_name);
Kevin Stevesef4eea92001-02-05 12:42:17 +0000186 if (spw != NULL)
Damien Miller8eb0fd61999-12-31 08:49:13 +1100187 pw_password = spw->sp_pwdp;
Damien Miller2101bfc2003-01-22 15:42:26 +1100188# endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
Damien Miller78315eb2000-09-29 23:01:36 +1100189
Damien Miller2101bfc2003-01-22 15:42:26 +1100190# if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
Damien Millerdfc83f42000-05-20 15:02:59 +1000191 if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL)
Damien Millerdfc83f42000-05-20 15:02:59 +1000192 pw_password = spw->pwa_passwd;
Damien Miller2101bfc2003-01-22 15:42:26 +1100193# endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */
Damien Miller78315eb2000-09-29 23:01:36 +1100194
Damien Miller2101bfc2003-01-22 15:42:26 +1100195# ifdef HAVE_SECUREWARE
Kevin Steves0ea1d9d2002-04-25 18:17:04 +0000196 if ((spw = getprpwnam(pw->pw_name)) != NULL)
197 pw_password = spw->ufld.fd_encrypt;
Damien Miller2101bfc2003-01-22 15:42:26 +1100198# endif /* HAVE_SECUREWARE */
Kevin Steves0ea1d9d2002-04-25 18:17:04 +0000199
Damien Miller2101bfc2003-01-22 15:42:26 +1100200# if defined(__hpux) && !defined(HAVE_SECUREWARE)
Damien Miller8a1e6a62000-09-16 15:55:52 +1100201 if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL)
202 pw_password = spw->ufld.fd_encrypt;
Damien Miller2101bfc2003-01-22 15:42:26 +1100203# endif /* defined(__hpux) && !defined(HAVE_SECUREWARE) */
Damien Miller8a1e6a62000-09-16 15:55:52 +1100204
205 /* Check for users with no password. */
206 if ((password[0] == '\0') && (pw_password[0] == '\0'))
207 return 1;
Damien Miller2e1b0821999-12-25 10:11:29 +1100208
209 if (pw_password[0] != '\0')
210 salt = pw_password;
211 else
212 salt = "xx";
213
Damien Miller2101bfc2003-01-22 15:42:26 +1100214# ifdef HAVE_MD5_PASSWORDS
Damien Miller2e1b0821999-12-25 10:11:29 +1100215 if (is_md5_salt(salt))
216 encrypted_password = md5_crypt(password, salt);
217 else
218 encrypted_password = crypt(password, salt);
Damien Miller2101bfc2003-01-22 15:42:26 +1100219# else /* HAVE_MD5_PASSWORDS */
220# if defined(__hpux) && !defined(HAVE_SECUREWARE)
Damien Miller8a1e6a62000-09-16 15:55:52 +1100221 if (iscomsec())
222 encrypted_password = bigcrypt(password, salt);
223 else
224 encrypted_password = crypt(password, salt);
Damien Millerf9661092002-01-03 10:30:56 +1100225# else
Damien Miller2101bfc2003-01-22 15:42:26 +1100226# ifdef HAVE_SECUREWARE
227 encrypted_password = bigcrypt(password, salt);
228# else
Damien Miller2e1b0821999-12-25 10:11:29 +1100229 encrypted_password = crypt(password, salt);
Damien Miller2101bfc2003-01-22 15:42:26 +1100230# endif /* HAVE_SECUREWARE */
231# endif /* __hpux && !defined(HAVE_SECUREWARE) */
232# endif /* HAVE_MD5_PASSWORDS */
Damien Miller2e1b0821999-12-25 10:11:29 +1100233
234 /* Authentication is accepted if the encrypted passwords are identical. */
235 return (strcmp(encrypted_password, pw_password) == 0);
Damien Miller4f9f42a2003-05-10 19:28:02 +1000236#endif /* !HAVE_OSF_SIA */
Kevin Stevese683e762002-04-04 19:02:28 +0000237}