blob: 7f307383968d58924200e7475991956bbc75e4fb [file] [log] [blame]
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 Lindstromd96c8b32002-03-05 01:45:56 +000039RCSID("$OpenBSD: auth-passwd.c,v 1.24 2002/03/04 12:43:06 markus 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
Kevin Stevese683e762002-04-04 19:02:28 +000046#if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
47/* Don't need any of these headers for the PAM or SIA cases */
48# 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
58# ifdef HAVE_SCO_PROTECTED_PW
59# include <sys/security.h>
60# include <sys/audit.h>
61# include <prot.h>
62# endif /* HAVE_SCO_PROTECTED_PW */
63# 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
81#endif /* !USE_PAM && !HAVE_OSF_SIA */
Damien Miller60396b02001-02-18 17:01:00 +110082
83extern ServerOptions options;
84
Damien Miller95def091999-11-25 00:26:21 +110085/*
86 * Tries to authenticate the user using password. Returns true if
87 * authentication succeeds.
88 */
Damien Miller4af51302000-04-16 11:18:38 +100089int
Damien Miller60396b02001-02-18 17:01:00 +110090auth_password(Authctxt *authctxt, const char *password)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100091{
Kevin Stevese683e762002-04-04 19:02:28 +000092#if defined(USE_PAM)
93 if (*password == '\0' && options.permit_empty_passwd == 0)
94 return 0;
95 return auth_pam_password(authctxt, password);
96#elif defined(HAVE_OSF_SIA)
97 if (*password == '\0' && options.permit_empty_passwd == 0)
98 return 0;
99 return auth_sia_password(authctxt, password);
100#else
Damien Miller60396b02001-02-18 17:01:00 +1100101 struct passwd * pw = authctxt->pw;
Damien Miller95def091999-11-25 00:26:21 +1100102 char *encrypted_password;
Damien Miller2e1b0821999-12-25 10:11:29 +1100103 char *pw_password;
104 char *salt;
Damien Miller8a1e6a62000-09-16 15:55:52 +1100105#ifdef __hpux
106 struct pr_passwd *spw;
107#endif
Damien Miller78315eb2000-09-29 23:01:36 +1100108#ifdef HAVE_SCO_PROTECTED_PW
109 struct pr_passwd *spw;
110#endif /* HAVE_SCO_PROTECTED_PW */
Damien Miller8a1e6a62000-09-16 15:55:52 +1100111#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
Damien Miller95def091999-11-25 00:26:21 +1100112 struct spwd *spw;
Damien Miller2cb210f1999-11-13 15:40:10 +1100113#endif
Damien Miller8a1e6a62000-09-16 15:55:52 +1100114#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
Damien Millerdfc83f42000-05-20 15:02:59 +1000115 struct passwd_adjunct *spw;
116#endif
Damien Miller1fa154b2000-01-23 10:32:03 +1100117#ifdef WITH_AIXAUTHENTICATE
118 char *authmsg;
119 char *loginmsg;
120 int reenter = 1;
121#endif
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000122
Damien Millerece22a81999-12-30 09:48:15 +1100123 /* deny if no user. */
124 if (pw == NULL)
125 return 0;
Damien Millerbac2d8a2000-09-05 16:13:06 +1100126#ifndef HAVE_CYGWIN
Ben Lindstromd8a90212001-02-15 03:08:27 +0000127 if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
Damien Miller95def091999-11-25 00:26:21 +1100128 return 0;
Damien Millerbac2d8a2000-09-05 16:13:06 +1100129#endif
130#ifdef HAVE_CYGWIN
131 /*
132 * Empty password is only possible on NT if the user has _really_
133 * an empty password and authentication is done, though.
134 */
Kevin Stevesef4eea92001-02-05 12:42:17 +0000135 if (!is_winnt)
Damien Millerbac2d8a2000-09-05 16:13:06 +1100136#endif
Damien Miller5428f641999-11-25 11:54:57 +1100137 if (*password == '\0' && options.permit_empty_passwd == 0)
Damien Miller95def091999-11-25 00:26:21 +1100138 return 0;
Ben Lindstromec95ed92001-07-04 04:21:14 +0000139#ifdef KRB5
140 if (options.kerberos_authentication == 1) {
141 int ret = auth_krb5_password(authctxt, password);
142 if (ret == 1 || ret == 0)
143 return ret;
144 /* Fall back to ordinary passwd authentication. */
145 }
Damien Miller60396b02001-02-18 17:01:00 +1100146#endif
Damien Millerbac2d8a2000-09-05 16:13:06 +1100147#ifdef HAVE_CYGWIN
148 if (is_winnt) {
149 HANDLE hToken = cygwin_logon_user(pw, password);
150
151 if (hToken == INVALID_HANDLE_VALUE)
152 return 0;
153 cygwin_set_impersonation_token(hToken);
154 return 1;
155 }
156#endif
Damien Miller1fa154b2000-01-23 10:32:03 +1100157#ifdef WITH_AIXAUTHENTICATE
158 return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
159#endif
Damien Milleraae6c611999-12-06 11:47:28 +1100160#ifdef KRB4
161 if (options.kerberos_authentication == 1) {
Ben Lindstromec95ed92001-07-04 04:21:14 +0000162 int ret = auth_krb4_password(authctxt, password);
Damien Milleraae6c611999-12-06 11:47:28 +1100163 if (ret == 1 || ret == 0)
164 return ret;
Damien Miller95def091999-11-25 00:26:21 +1100165 /* Fall back to ordinary passwd authentication. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000166 }
Damien Milleraae6c611999-12-06 11:47:28 +1100167#endif
Ben Lindstromec95ed92001-07-04 04:21:14 +0000168#ifdef BSD_AUTH
169 if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
170 (char *)password) == 0)
171 return 0;
172 else
173 return 1;
174#endif
Damien Miller2e1b0821999-12-25 10:11:29 +1100175 pw_password = pw->pw_passwd;
Damien Miller606f8802000-09-16 15:39:56 +1100176
Damien Miller8a1e6a62000-09-16 15:55:52 +1100177 /*
178 * Various interfaces to shadow or protected password data
179 */
Damien Millercb7e5f91999-12-21 21:03:09 +1100180#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
Damien Miller95def091999-11-25 00:26:21 +1100181 spw = getspnam(pw->pw_name);
Kevin Stevesef4eea92001-02-05 12:42:17 +0000182 if (spw != NULL)
Damien Miller8eb0fd61999-12-31 08:49:13 +1100183 pw_password = spw->sp_pwdp;
Damien Millercb7e5f91999-12-21 21:03:09 +1100184#endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
Damien Miller78315eb2000-09-29 23:01:36 +1100185
186#ifdef HAVE_SCO_PROTECTED_PW
187 spw = getprpwnam(pw->pw_name);
Kevin Stevesef4eea92001-02-05 12:42:17 +0000188 if (spw != NULL)
Damien Miller78315eb2000-09-29 23:01:36 +1100189 pw_password = spw->ufld.fd_encrypt;
190#endif /* HAVE_SCO_PROTECTED_PW */
191
Damien Millerdfc83f42000-05-20 15:02:59 +1000192#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
193 if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL)
Damien Millerdfc83f42000-05-20 15:02:59 +1000194 pw_password = spw->pwa_passwd;
Damien Millerdfc83f42000-05-20 15:02:59 +1000195#endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */
Damien Miller78315eb2000-09-29 23:01:36 +1100196
Damien Miller8a1e6a62000-09-16 15:55:52 +1100197#if defined(__hpux)
198 if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL)
199 pw_password = spw->ufld.fd_encrypt;
200#endif /* defined(__hpux) */
201
202 /* Check for users with no password. */
203 if ((password[0] == '\0') && (pw_password[0] == '\0'))
204 return 1;
Damien Miller2e1b0821999-12-25 10:11:29 +1100205
206 if (pw_password[0] != '\0')
207 salt = pw_password;
208 else
209 salt = "xx";
210
211#ifdef HAVE_MD5_PASSWORDS
212 if (is_md5_salt(salt))
213 encrypted_password = md5_crypt(password, salt);
214 else
215 encrypted_password = crypt(password, salt);
Kevin Stevesef4eea92001-02-05 12:42:17 +0000216#else /* HAVE_MD5_PASSWORDS */
Damien Miller8a1e6a62000-09-16 15:55:52 +1100217# ifdef __hpux
218 if (iscomsec())
219 encrypted_password = bigcrypt(password, salt);
220 else
221 encrypted_password = crypt(password, salt);
Damien Miller1bead332000-04-30 00:47:29 +1000222# else
Damien Millerf9661092002-01-03 10:30:56 +1100223# ifdef HAVE_SCO_PROTECTED_PW
224 encrypted_password = bigcrypt(password, salt);
225# else
Damien Miller2e1b0821999-12-25 10:11:29 +1100226 encrypted_password = crypt(password, salt);
Damien Millerf9661092002-01-03 10:30:56 +1100227# endif /* HAVE_SCO_PROTECTED_PW */
Damien Miller8a1e6a62000-09-16 15:55:52 +1100228# endif /* __hpux */
Kevin Stevesef4eea92001-02-05 12:42:17 +0000229#endif /* HAVE_MD5_PASSWORDS */
Damien Miller2e1b0821999-12-25 10:11:29 +1100230
231 /* Authentication is accepted if the encrypted passwords are identical. */
232 return (strcmp(encrypted_password, pw_password) == 0);
Damien Millerb8c656e2000-06-28 15:22:41 +1000233#endif /* !USE_PAM && !HAVE_OSF_SIA */
Kevin Stevese683e762002-04-04 19:02:28 +0000234}