blob: 185db7d6df95c2bce4b2f8b84337a26375b49940 [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"
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
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
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
81#endif /* !USE_PAM && !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{
Kevin Stevese683e762002-04-04 19:02:28 +000095#if defined(USE_PAM)
Ben Lindstrom0b478142002-05-10 02:40:15 +000096 if (*password == '\0' && options.permit_empty_passwd == 0)
Kevin Stevese683e762002-04-04 19:02:28 +000097 return 0;
98 return auth_pam_password(authctxt, password);
99#elif defined(HAVE_OSF_SIA)
Ben Lindstrom0b478142002-05-10 02:40:15 +0000100 if (*password == '\0' && options.permit_empty_passwd == 0)
Kevin Stevese683e762002-04-04 19:02:28 +0000101 return 0;
102 return auth_sia_password(authctxt, password);
103#else
Ben Lindstrom0b478142002-05-10 02:40:15 +0000104 struct passwd * pw = authctxt->pw;
Damien Miller95def091999-11-25 00:26:21 +1100105 char *encrypted_password;
Damien Miller2e1b0821999-12-25 10:11:29 +1100106 char *pw_password;
107 char *salt;
Kevin Steves0ea1d9d2002-04-25 18:17:04 +0000108#if defined(__hpux) || defined(HAVE_SECUREWARE)
Damien Miller8a1e6a62000-09-16 15:55:52 +1100109 struct pr_passwd *spw;
Kevin Steves0ea1d9d2002-04-25 18:17:04 +0000110#endif /* __hpux || HAVE_SECUREWARE */
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;
Ben Lindstrom164725f2002-09-25 23:14:14 +0000119 int authsuccess;
Damien Miller1fa154b2000-01-23 10:32:03 +1100120 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
Ben Lindstrom0b478142002-05-10 02:40:15 +0000130 if (*password == '\0' && options.permit_empty_passwd == 0)
Damien Miller95def091999-11-25 00:26:21 +1100131 return 0;
Ben Lindstromec95ed92001-07-04 04:21:14 +0000132#ifdef KRB5
133 if (options.kerberos_authentication == 1) {
134 int ret = auth_krb5_password(authctxt, password);
135 if (ret == 1 || ret == 0)
136 return ret;
137 /* Fall back to ordinary passwd authentication. */
138 }
Damien Miller60396b02001-02-18 17:01:00 +1100139#endif
Damien Millerbac2d8a2000-09-05 16:13:06 +1100140#ifdef HAVE_CYGWIN
141 if (is_winnt) {
142 HANDLE hToken = cygwin_logon_user(pw, password);
143
144 if (hToken == INVALID_HANDLE_VALUE)
145 return 0;
146 cygwin_set_impersonation_token(hToken);
147 return 1;
148 }
149#endif
Damien Miller1fa154b2000-01-23 10:32:03 +1100150#ifdef WITH_AIXAUTHENTICATE
Ben Lindstrom164725f2002-09-25 23:14:14 +0000151 authsuccess = (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
152
153 if (authsuccess)
154 /* We don't have a pty yet, so just label the line as "ssh" */
155 if (loginsuccess(authctxt->user,
156 get_canonical_hostname(options.verify_reverse_mapping),
157 "ssh", &aixloginmsg) < 0)
158 aixloginmsg = NULL;
159
160 return(authsuccess);
Damien Miller1fa154b2000-01-23 10:32:03 +1100161#endif
Damien Milleraae6c611999-12-06 11:47:28 +1100162#ifdef KRB4
163 if (options.kerberos_authentication == 1) {
Ben Lindstromec95ed92001-07-04 04:21:14 +0000164 int ret = auth_krb4_password(authctxt, password);
Damien Milleraae6c611999-12-06 11:47:28 +1100165 if (ret == 1 || ret == 0)
166 return ret;
Damien Miller95def091999-11-25 00:26:21 +1100167 /* Fall back to ordinary passwd authentication. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000168 }
Damien Milleraae6c611999-12-06 11:47:28 +1100169#endif
Ben Lindstromec95ed92001-07-04 04:21:14 +0000170#ifdef BSD_AUTH
171 if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
172 (char *)password) == 0)
173 return 0;
174 else
175 return 1;
176#endif
Damien Miller2e1b0821999-12-25 10:11:29 +1100177 pw_password = pw->pw_passwd;
Damien Miller606f8802000-09-16 15:39:56 +1100178
Damien Miller8a1e6a62000-09-16 15:55:52 +1100179 /*
180 * Various interfaces to shadow or protected password data
181 */
Damien Millercb7e5f91999-12-21 21:03:09 +1100182#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
Damien Miller95def091999-11-25 00:26:21 +1100183 spw = getspnam(pw->pw_name);
Kevin Stevesef4eea92001-02-05 12:42:17 +0000184 if (spw != NULL)
Damien Miller8eb0fd61999-12-31 08:49:13 +1100185 pw_password = spw->sp_pwdp;
Damien Millercb7e5f91999-12-21 21:03:09 +1100186#endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
Damien Miller78315eb2000-09-29 23:01:36 +1100187
Damien Millerdfc83f42000-05-20 15:02:59 +1000188#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
189 if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL)
Damien Millerdfc83f42000-05-20 15:02:59 +1000190 pw_password = spw->pwa_passwd;
Damien Millerdfc83f42000-05-20 15:02:59 +1000191#endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */
Damien Miller78315eb2000-09-29 23:01:36 +1100192
Kevin Steves0ea1d9d2002-04-25 18:17:04 +0000193#ifdef HAVE_SECUREWARE
194 if ((spw = getprpwnam(pw->pw_name)) != NULL)
195 pw_password = spw->ufld.fd_encrypt;
196#endif /* HAVE_SECUREWARE */
197
198#if defined(__hpux) && !defined(HAVE_SECUREWARE)
Damien Miller8a1e6a62000-09-16 15:55:52 +1100199 if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL)
200 pw_password = spw->ufld.fd_encrypt;
Kevin Steves0ea1d9d2002-04-25 18:17:04 +0000201#endif /* defined(__hpux) && !defined(HAVE_SECUREWARE) */
Damien Miller8a1e6a62000-09-16 15:55:52 +1100202
203 /* Check for users with no password. */
204 if ((password[0] == '\0') && (pw_password[0] == '\0'))
205 return 1;
Damien Miller2e1b0821999-12-25 10:11:29 +1100206
207 if (pw_password[0] != '\0')
208 salt = pw_password;
209 else
210 salt = "xx";
211
212#ifdef HAVE_MD5_PASSWORDS
213 if (is_md5_salt(salt))
214 encrypted_password = md5_crypt(password, salt);
215 else
216 encrypted_password = crypt(password, salt);
Kevin Stevesef4eea92001-02-05 12:42:17 +0000217#else /* HAVE_MD5_PASSWORDS */
Kevin Steves0ea1d9d2002-04-25 18:17:04 +0000218# if defined(__hpux) && !defined(HAVE_SECUREWARE)
Damien Miller8a1e6a62000-09-16 15:55:52 +1100219 if (iscomsec())
220 encrypted_password = bigcrypt(password, salt);
221 else
222 encrypted_password = crypt(password, salt);
Damien Miller1bead332000-04-30 00:47:29 +1000223# else
Kevin Steves0ea1d9d2002-04-25 18:17:04 +0000224# ifdef HAVE_SECUREWARE
Damien Millerf9661092002-01-03 10:30:56 +1100225 encrypted_password = bigcrypt(password, salt);
226# else
Damien Miller2e1b0821999-12-25 10:11:29 +1100227 encrypted_password = crypt(password, salt);
Kevin Steves0ea1d9d2002-04-25 18:17:04 +0000228# endif /* HAVE_SECUREWARE */
229# endif /* __hpux && !defined(HAVE_SECUREWARE) */
Kevin Stevesef4eea92001-02-05 12:42:17 +0000230#endif /* HAVE_MD5_PASSWORDS */
Damien Miller2e1b0821999-12-25 10:11:29 +1100231
232 /* Authentication is accepted if the encrypted passwords are identical. */
233 return (strcmp(encrypted_password, pw_password) == 0);
Damien Millerb8c656e2000-06-28 15:22:41 +1000234#endif /* !USE_PAM && !HAVE_OSF_SIA */
Kevin Stevese683e762002-04-04 19:02:28 +0000235}