Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 4 | * All rights reserved |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 5 | * Password authentication. This file contains the functions to check whether |
| 6 | * the password is valid for the user. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 7 | * |
| 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 Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 14 | * Copyright (c) 1999 Dug Song. All rights reserved. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 15 | * 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 Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 36 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 37 | |
| 38 | #include "includes.h" |
Damien Miller | 444f9fc | 2002-06-21 16:05:12 +1000 | [diff] [blame] | 39 | RCSID("$OpenBSD: auth-passwd.c,v 1.27 2002/05/24 16:45:16 stevesk Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 40 | |
| 41 | #include "packet.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 42 | #include "log.h" |
| 43 | #include "servconf.h" |
Ben Lindstrom | db65e8f | 2001-01-19 04:26:52 +0000 | [diff] [blame] | 44 | #include "auth.h" |
Ben Lindstrom | 0410e32 | 2003-07-24 06:52:13 +0000 | [diff] [blame^] | 45 | #include "openbsd-compat/xcrypt.h" |
| 46 | #ifdef WITH_AIXAUTHENTICATE |
| 47 | # include "buffer.h" |
| 48 | # include "canohost.h" |
| 49 | extern Buffer loginmsg; |
| 50 | #endif |
Damien Miller | 60396b0 | 2001-02-18 17:01:00 +1100 | [diff] [blame] | 51 | |
| 52 | extern ServerOptions options; |
| 53 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 54 | /* |
| 55 | * Tries to authenticate the user using password. Returns true if |
| 56 | * authentication succeeds. |
| 57 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 58 | int |
Damien Miller | 60396b0 | 2001-02-18 17:01:00 +1100 | [diff] [blame] | 59 | auth_password(Authctxt *authctxt, const char *password) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 60 | { |
Ben Lindstrom | 0b47814 | 2002-05-10 02:40:15 +0000 | [diff] [blame] | 61 | struct passwd * pw = authctxt->pw; |
Damien Miller | eab4bae | 2003-04-29 23:22:40 +1000 | [diff] [blame] | 62 | int ok = authctxt->valid; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 63 | |
Damien Miller | ece22a8 | 1999-12-30 09:48:15 +1100 | [diff] [blame] | 64 | /* deny if no user. */ |
| 65 | if (pw == NULL) |
Damien Miller | eab4bae | 2003-04-29 23:22:40 +1000 | [diff] [blame] | 66 | ok = 0; |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 67 | #ifndef HAVE_CYGWIN |
Damien Miller | eab4bae | 2003-04-29 23:22:40 +1000 | [diff] [blame] | 68 | if (pw && pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES) |
| 69 | ok = 0; |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 70 | #endif |
Ben Lindstrom | 0b47814 | 2002-05-10 02:40:15 +0000 | [diff] [blame] | 71 | if (*password == '\0' && options.permit_empty_passwd == 0) |
Damien Miller | eab4bae | 2003-04-29 23:22:40 +1000 | [diff] [blame] | 72 | ok = 0; |
Damien Miller | 2101bfc | 2003-01-22 15:42:26 +1100 | [diff] [blame] | 73 | |
Damien Miller | eab4bae | 2003-04-29 23:22:40 +1000 | [diff] [blame] | 74 | if (!ok) |
| 75 | return 0; |
Ben Lindstrom | 0410e32 | 2003-07-24 06:52:13 +0000 | [diff] [blame^] | 76 | |
| 77 | #if defined(HAVE_OSF_SIA) |
Damien Miller | 2101bfc | 2003-01-22 15:42:26 +1100 | [diff] [blame] | 78 | return auth_sia_password(authctxt, password); |
| 79 | #else |
| 80 | # ifdef KRB5 |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 81 | if (options.kerberos_authentication == 1) { |
| 82 | int ret = auth_krb5_password(authctxt, password); |
| 83 | if (ret == 1 || ret == 0) |
| 84 | return ret; |
| 85 | /* Fall back to ordinary passwd authentication. */ |
| 86 | } |
Damien Miller | 2101bfc | 2003-01-22 15:42:26 +1100 | [diff] [blame] | 87 | # endif |
| 88 | # ifdef HAVE_CYGWIN |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 89 | if (is_winnt) { |
| 90 | HANDLE hToken = cygwin_logon_user(pw, password); |
| 91 | |
| 92 | if (hToken == INVALID_HANDLE_VALUE) |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 93 | return (0); |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 94 | cygwin_set_impersonation_token(hToken); |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 95 | return (1); |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 96 | } |
Damien Miller | 2101bfc | 2003-01-22 15:42:26 +1100 | [diff] [blame] | 97 | # endif |
| 98 | # ifdef WITH_AIXAUTHENTICATE |
Ben Lindstrom | 0410e32 | 2003-07-24 06:52:13 +0000 | [diff] [blame^] | 99 | { |
| 100 | char *authmsg; |
| 101 | int reenter = 1; |
| 102 | int authsuccess = (authenticate(pw->pw_name, password, |
| 103 | &reenter, &authmsg) == 0); |
| 104 | aix_remove_embedded_newlines(authmsg); |
Ben Lindstrom | 164725f | 2002-09-25 23:14:14 +0000 | [diff] [blame] | 105 | |
Ben Lindstrom | 0410e32 | 2003-07-24 06:52:13 +0000 | [diff] [blame^] | 106 | if (authsuccess) { |
| 107 | char *msg; |
| 108 | char *host = |
| 109 | (char *)get_canonical_hostname(options.use_dns); |
Darren Tucker | b9aa0a0 | 2003-07-08 22:59:59 +1000 | [diff] [blame] | 110 | |
Ben Lindstrom | 0410e32 | 2003-07-24 06:52:13 +0000 | [diff] [blame^] | 111 | debug3("AIX/authenticate succeeded for user %s: %.100s", |
| 112 | pw->pw_name, authmsg); |
Darren Tucker | b9aa0a0 | 2003-07-08 22:59:59 +1000 | [diff] [blame] | 113 | |
Ben Lindstrom | 0410e32 | 2003-07-24 06:52:13 +0000 | [diff] [blame^] | 114 | /* No pty yet, so just label the line as "ssh" */ |
| 115 | if (loginsuccess(authctxt->user, host, "ssh", |
| 116 | &msg) == 0){ |
| 117 | if (msg != NULL) { |
| 118 | debug("%s: msg %s", __func__, msg); |
| 119 | buffer_append(&loginmsg, msg, |
| 120 | strlen(msg)); |
| 121 | xfree(msg); |
| 122 | } |
Darren Tucker | b9aa0a0 | 2003-07-08 22:59:59 +1000 | [diff] [blame] | 123 | } |
Ben Lindstrom | 0410e32 | 2003-07-24 06:52:13 +0000 | [diff] [blame^] | 124 | } else |
| 125 | debug3("AIX/authenticate failed for user %s: %.100s", |
| 126 | pw->pw_name, authmsg); |
Ben Lindstrom | 164725f | 2002-09-25 23:14:14 +0000 | [diff] [blame] | 127 | |
Ben Lindstrom | 0410e32 | 2003-07-24 06:52:13 +0000 | [diff] [blame^] | 128 | if (authmsg != NULL) |
| 129 | xfree(authmsg); |
| 130 | |
| 131 | return (authsuccess); |
| 132 | } |
Damien Miller | 2101bfc | 2003-01-22 15:42:26 +1100 | [diff] [blame] | 133 | # endif |
| 134 | # ifdef KRB4 |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 135 | if (options.kerberos_authentication == 1) { |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 136 | int ret = auth_krb4_password(authctxt, password); |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 137 | if (ret == 1 || ret == 0) |
| 138 | return ret; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 139 | /* Fall back to ordinary passwd authentication. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 140 | } |
Damien Miller | 2101bfc | 2003-01-22 15:42:26 +1100 | [diff] [blame] | 141 | # endif |
| 142 | # ifdef BSD_AUTH |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 143 | if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh", |
| 144 | (char *)password) == 0) |
| 145 | return 0; |
| 146 | else |
| 147 | return 1; |
Ben Lindstrom | 0410e32 | 2003-07-24 06:52:13 +0000 | [diff] [blame^] | 148 | # else |
| 149 | { |
| 150 | char *pw_password = shadow_pw(pw); |
Damien Miller | 8a1e6a6 | 2000-09-16 15:55:52 +1100 | [diff] [blame] | 151 | |
| 152 | /* Check for users with no password. */ |
Ben Lindstrom | 0410e32 | 2003-07-24 06:52:13 +0000 | [diff] [blame^] | 153 | /* XXX Reverted back to OpenBSD, why was this changed again? */ |
| 154 | if (strcmp(pw_password, "") == 0 && strcmp(pw->pw_passwd, "") == 0) |
Damien Miller | 8a1e6a6 | 2000-09-16 15:55:52 +1100 | [diff] [blame] | 155 | return 1; |
Ben Lindstrom | 0410e32 | 2003-07-24 06:52:13 +0000 | [diff] [blame^] | 156 | else { |
| 157 | /* Encrypt the candidate password using the proper salt. */ |
| 158 | char *encrypted_password = xcrypt(password, |
| 159 | (pw_password[0] && pw_password[1]) ? pw_password : "xx"); |
Damien Miller | 2e1b082 | 1999-12-25 10:11:29 +1100 | [diff] [blame] | 160 | |
Ben Lindstrom | 0410e32 | 2003-07-24 06:52:13 +0000 | [diff] [blame^] | 161 | /* |
| 162 | * Authentication is accepted if the encrypted passwords |
| 163 | * are identical. |
| 164 | */ |
| 165 | return (strcmp(encrypted_password, pw_password) == 0); |
| 166 | } |
Damien Miller | 2e1b082 | 1999-12-25 10:11:29 +1100 | [diff] [blame] | 167 | |
Ben Lindstrom | 0410e32 | 2003-07-24 06:52:13 +0000 | [diff] [blame^] | 168 | } |
| 169 | # endif |
Damien Miller | 4f9f42a | 2003-05-10 19:28:02 +1000 | [diff] [blame] | 170 | #endif /* !HAVE_OSF_SIA */ |
Kevin Steves | e683e76 | 2002-04-04 19:02:28 +0000 | [diff] [blame] | 171 | } |