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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 Lindstromd8a90212001-02-15 03:08:27 +000039RCSID("$OpenBSD: auth-passwd.c,v 1.21 2001/02/12 16:16:23 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 Miller60396b02001-02-18 17:01:00 +110080
81extern ServerOptions options;
82
Damien Miller95def091999-11-25 00:26:21 +110083/*
84 * Tries to authenticate the user using password. Returns true if
85 * authentication succeeds.
86 */
Damien Miller4af51302000-04-16 11:18:38 +100087int
Damien Miller60396b02001-02-18 17:01:00 +110088auth_password(Authctxt *authctxt, const char *password)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100089{
Damien Miller60396b02001-02-18 17:01:00 +110090 struct passwd * pw = authctxt->pw;
Damien Miller95def091999-11-25 00:26:21 +110091 char *encrypted_password;
Damien Miller2e1b0821999-12-25 10:11:29 +110092 char *pw_password;
93 char *salt;
Damien Miller8a1e6a62000-09-16 15:55:52 +110094#ifdef __hpux
95 struct pr_passwd *spw;
96#endif
Damien Miller78315eb2000-09-29 23:01:36 +110097#ifdef HAVE_SCO_PROTECTED_PW
98 struct pr_passwd *spw;
99#endif /* HAVE_SCO_PROTECTED_PW */
Damien Miller8a1e6a62000-09-16 15:55:52 +1100100#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
Damien Miller95def091999-11-25 00:26:21 +1100101 struct spwd *spw;
Damien Miller2cb210f1999-11-13 15:40:10 +1100102#endif
Damien Miller8a1e6a62000-09-16 15:55:52 +1100103#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
Damien Millerdfc83f42000-05-20 15:02:59 +1000104 struct passwd_adjunct *spw;
105#endif
Damien Miller1fa154b2000-01-23 10:32:03 +1100106#ifdef WITH_AIXAUTHENTICATE
107 char *authmsg;
108 char *loginmsg;
109 int reenter = 1;
110#endif
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000111
Damien Millerece22a81999-12-30 09:48:15 +1100112 /* deny if no user. */
113 if (pw == NULL)
114 return 0;
Damien Millerbac2d8a2000-09-05 16:13:06 +1100115#ifndef HAVE_CYGWIN
Ben Lindstromd8a90212001-02-15 03:08:27 +0000116 if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
Damien Miller95def091999-11-25 00:26:21 +1100117 return 0;
Damien Millerbac2d8a2000-09-05 16:13:06 +1100118#endif
119#ifdef HAVE_CYGWIN
120 /*
121 * Empty password is only possible on NT if the user has _really_
122 * an empty password and authentication is done, though.
123 */
Kevin Stevesef4eea92001-02-05 12:42:17 +0000124 if (!is_winnt)
Damien Millerbac2d8a2000-09-05 16:13:06 +1100125#endif
Damien Miller5428f641999-11-25 11:54:57 +1100126 if (*password == '\0' && options.permit_empty_passwd == 0)
Damien Miller95def091999-11-25 00:26:21 +1100127 return 0;
Damien Miller60396b02001-02-18 17:01:00 +1100128#ifdef BSD_AUTH
129 if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
130 (char *)password) == 0)
131 return 0;
132 else
133 return 1;
134#endif
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000135
Damien Millerbac2d8a2000-09-05 16:13:06 +1100136#ifdef HAVE_CYGWIN
137 if (is_winnt) {
138 HANDLE hToken = cygwin_logon_user(pw, password);
139
140 if (hToken == INVALID_HANDLE_VALUE)
141 return 0;
142 cygwin_set_impersonation_token(hToken);
143 return 1;
144 }
145#endif
146
Damien Miller1fa154b2000-01-23 10:32:03 +1100147#ifdef WITH_AIXAUTHENTICATE
148 return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
149#endif
150
Damien Milleraae6c611999-12-06 11:47:28 +1100151#ifdef KRB4
152 if (options.kerberos_authentication == 1) {
153 int ret = auth_krb4_password(pw, password);
154 if (ret == 1 || ret == 0)
155 return ret;
Damien Miller95def091999-11-25 00:26:21 +1100156 /* Fall back to ordinary passwd authentication. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000157 }
Damien Milleraae6c611999-12-06 11:47:28 +1100158#endif
Damien Miller95def091999-11-25 00:26:21 +1100159
Damien Miller8a1e6a62000-09-16 15:55:52 +1100160
Damien Miller2e1b0821999-12-25 10:11:29 +1100161 pw_password = pw->pw_passwd;
Damien Miller606f8802000-09-16 15:39:56 +1100162
Damien Miller8a1e6a62000-09-16 15:55:52 +1100163 /*
164 * Various interfaces to shadow or protected password data
165 */
Damien Millercb7e5f91999-12-21 21:03:09 +1100166#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
Damien Miller95def091999-11-25 00:26:21 +1100167 spw = getspnam(pw->pw_name);
Kevin Stevesef4eea92001-02-05 12:42:17 +0000168 if (spw != NULL)
Damien Miller8eb0fd61999-12-31 08:49:13 +1100169 pw_password = spw->sp_pwdp;
Damien Millercb7e5f91999-12-21 21:03:09 +1100170#endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
Damien Miller78315eb2000-09-29 23:01:36 +1100171
172#ifdef HAVE_SCO_PROTECTED_PW
173 spw = getprpwnam(pw->pw_name);
Kevin Stevesef4eea92001-02-05 12:42:17 +0000174 if (spw != NULL)
Damien Miller78315eb2000-09-29 23:01:36 +1100175 pw_password = spw->ufld.fd_encrypt;
176#endif /* HAVE_SCO_PROTECTED_PW */
177
Damien Millerdfc83f42000-05-20 15:02:59 +1000178#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
179 if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL)
Damien Millerdfc83f42000-05-20 15:02:59 +1000180 pw_password = spw->pwa_passwd;
Damien Millerdfc83f42000-05-20 15:02:59 +1000181#endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */
Damien Miller78315eb2000-09-29 23:01:36 +1100182
Damien Miller8a1e6a62000-09-16 15:55:52 +1100183#if defined(__hpux)
184 if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL)
185 pw_password = spw->ufld.fd_encrypt;
186#endif /* defined(__hpux) */
187
188 /* Check for users with no password. */
189 if ((password[0] == '\0') && (pw_password[0] == '\0'))
190 return 1;
Damien Miller2e1b0821999-12-25 10:11:29 +1100191
192 if (pw_password[0] != '\0')
193 salt = pw_password;
194 else
195 salt = "xx";
196
197#ifdef HAVE_MD5_PASSWORDS
198 if (is_md5_salt(salt))
199 encrypted_password = md5_crypt(password, salt);
200 else
201 encrypted_password = crypt(password, salt);
Kevin Stevesef4eea92001-02-05 12:42:17 +0000202#else /* HAVE_MD5_PASSWORDS */
Damien Miller8a1e6a62000-09-16 15:55:52 +1100203# ifdef __hpux
204 if (iscomsec())
205 encrypted_password = bigcrypt(password, salt);
206 else
207 encrypted_password = crypt(password, salt);
Damien Miller1bead332000-04-30 00:47:29 +1000208# else
Damien Miller2e1b0821999-12-25 10:11:29 +1100209 encrypted_password = crypt(password, salt);
Damien Miller8a1e6a62000-09-16 15:55:52 +1100210# endif /* __hpux */
Kevin Stevesef4eea92001-02-05 12:42:17 +0000211#endif /* HAVE_MD5_PASSWORDS */
Damien Miller2e1b0821999-12-25 10:11:29 +1100212
213 /* Authentication is accepted if the encrypted passwords are identical. */
214 return (strcmp(encrypted_password, pw_password) == 0);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000215}
Damien Millerb8c656e2000-06-28 15:22:41 +1000216#endif /* !USE_PAM && !HAVE_OSF_SIA */