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" |
Ben Lindstrom | d96c8b3 | 2002-03-05 01:45:56 +0000 | [diff] [blame] | 39 | RCSID("$OpenBSD: auth-passwd.c,v 1.24 2002/03/04 12:43:06 markus 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" |
| 45 | |
Kevin Steves | e683e76 | 2002-04-04 19:02:28 +0000 | [diff] [blame] | 46 | #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 Steves | 0ea1d9d | 2002-04-25 18:17:04 +0000 | [diff] [blame^] | 58 | # ifdef HAVE_SECUREWARE |
Kevin Steves | e683e76 | 2002-04-04 19:02:28 +0000 | [diff] [blame] | 59 | # include <sys/security.h> |
| 60 | # include <sys/audit.h> |
| 61 | # include <prot.h> |
Kevin Steves | 0ea1d9d | 2002-04-25 18:17:04 +0000 | [diff] [blame^] | 62 | # endif /* HAVE_SECUREWARE */ |
Kevin Steves | e683e76 | 2002-04-04 19:02:28 +0000 | [diff] [blame] | 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 Miller | dd1c7ba | 1999-11-19 15:53:20 +1100 | [diff] [blame] | 74 | |
Kevin Steves | e683e76 | 2002-04-04 19:02:28 +0000 | [diff] [blame] | 75 | # 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 Miller | 60396b0 | 2001-02-18 17:01:00 +1100 | [diff] [blame] | 82 | |
| 83 | extern ServerOptions options; |
| 84 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 85 | /* |
| 86 | * Tries to authenticate the user using password. Returns true if |
| 87 | * authentication succeeds. |
| 88 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 89 | int |
Damien Miller | 60396b0 | 2001-02-18 17:01:00 +1100 | [diff] [blame] | 90 | auth_password(Authctxt *authctxt, const char *password) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 91 | { |
Kevin Steves | e683e76 | 2002-04-04 19:02:28 +0000 | [diff] [blame] | 92 | #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 Miller | 60396b0 | 2001-02-18 17:01:00 +1100 | [diff] [blame] | 101 | struct passwd * pw = authctxt->pw; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 102 | char *encrypted_password; |
Damien Miller | 2e1b082 | 1999-12-25 10:11:29 +1100 | [diff] [blame] | 103 | char *pw_password; |
| 104 | char *salt; |
Kevin Steves | 0ea1d9d | 2002-04-25 18:17:04 +0000 | [diff] [blame^] | 105 | #if defined(__hpux) || defined(HAVE_SECUREWARE) |
Damien Miller | 8a1e6a6 | 2000-09-16 15:55:52 +1100 | [diff] [blame] | 106 | struct pr_passwd *spw; |
Kevin Steves | 0ea1d9d | 2002-04-25 18:17:04 +0000 | [diff] [blame^] | 107 | #endif /* __hpux || HAVE_SECUREWARE */ |
Damien Miller | 8a1e6a6 | 2000-09-16 15:55:52 +1100 | [diff] [blame] | 108 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 109 | struct spwd *spw; |
Damien Miller | 2cb210f | 1999-11-13 15:40:10 +1100 | [diff] [blame] | 110 | #endif |
Damien Miller | 8a1e6a6 | 2000-09-16 15:55:52 +1100 | [diff] [blame] | 111 | #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) |
Damien Miller | dfc83f4 | 2000-05-20 15:02:59 +1000 | [diff] [blame] | 112 | struct passwd_adjunct *spw; |
| 113 | #endif |
Damien Miller | 1fa154b | 2000-01-23 10:32:03 +1100 | [diff] [blame] | 114 | #ifdef WITH_AIXAUTHENTICATE |
| 115 | char *authmsg; |
| 116 | char *loginmsg; |
| 117 | int reenter = 1; |
| 118 | #endif |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 119 | |
Damien Miller | ece22a8 | 1999-12-30 09:48:15 +1100 | [diff] [blame] | 120 | /* deny if no user. */ |
| 121 | if (pw == NULL) |
| 122 | return 0; |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 123 | #ifndef HAVE_CYGWIN |
Ben Lindstrom | d8a9021 | 2001-02-15 03:08:27 +0000 | [diff] [blame] | 124 | if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 125 | return 0; |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 126 | #endif |
| 127 | #ifdef HAVE_CYGWIN |
| 128 | /* |
| 129 | * Empty password is only possible on NT if the user has _really_ |
| 130 | * an empty password and authentication is done, though. |
| 131 | */ |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 132 | if (!is_winnt) |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 133 | #endif |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 134 | if (*password == '\0' && options.permit_empty_passwd == 0) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 135 | return 0; |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 136 | #ifdef KRB5 |
| 137 | if (options.kerberos_authentication == 1) { |
| 138 | int ret = auth_krb5_password(authctxt, password); |
| 139 | if (ret == 1 || ret == 0) |
| 140 | return ret; |
| 141 | /* Fall back to ordinary passwd authentication. */ |
| 142 | } |
Damien Miller | 60396b0 | 2001-02-18 17:01:00 +1100 | [diff] [blame] | 143 | #endif |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 144 | #ifdef HAVE_CYGWIN |
| 145 | if (is_winnt) { |
| 146 | HANDLE hToken = cygwin_logon_user(pw, password); |
| 147 | |
| 148 | if (hToken == INVALID_HANDLE_VALUE) |
| 149 | return 0; |
| 150 | cygwin_set_impersonation_token(hToken); |
| 151 | return 1; |
| 152 | } |
| 153 | #endif |
Damien Miller | 1fa154b | 2000-01-23 10:32:03 +1100 | [diff] [blame] | 154 | #ifdef WITH_AIXAUTHENTICATE |
| 155 | return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0); |
| 156 | #endif |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 157 | #ifdef KRB4 |
| 158 | if (options.kerberos_authentication == 1) { |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 159 | int ret = auth_krb4_password(authctxt, password); |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 160 | if (ret == 1 || ret == 0) |
| 161 | return ret; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 162 | /* Fall back to ordinary passwd authentication. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 163 | } |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 164 | #endif |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 165 | #ifdef BSD_AUTH |
| 166 | if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh", |
| 167 | (char *)password) == 0) |
| 168 | return 0; |
| 169 | else |
| 170 | return 1; |
| 171 | #endif |
Damien Miller | 2e1b082 | 1999-12-25 10:11:29 +1100 | [diff] [blame] | 172 | pw_password = pw->pw_passwd; |
Damien Miller | 606f880 | 2000-09-16 15:39:56 +1100 | [diff] [blame] | 173 | |
Damien Miller | 8a1e6a6 | 2000-09-16 15:55:52 +1100 | [diff] [blame] | 174 | /* |
| 175 | * Various interfaces to shadow or protected password data |
| 176 | */ |
Damien Miller | cb7e5f9 | 1999-12-21 21:03:09 +1100 | [diff] [blame] | 177 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 178 | spw = getspnam(pw->pw_name); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 179 | if (spw != NULL) |
Damien Miller | 8eb0fd6 | 1999-12-31 08:49:13 +1100 | [diff] [blame] | 180 | pw_password = spw->sp_pwdp; |
Damien Miller | cb7e5f9 | 1999-12-21 21:03:09 +1100 | [diff] [blame] | 181 | #endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */ |
Damien Miller | 78315eb | 2000-09-29 23:01:36 +1100 | [diff] [blame] | 182 | |
Damien Miller | dfc83f4 | 2000-05-20 15:02:59 +1000 | [diff] [blame] | 183 | #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) |
| 184 | if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL) |
Damien Miller | dfc83f4 | 2000-05-20 15:02:59 +1000 | [diff] [blame] | 185 | pw_password = spw->pwa_passwd; |
Damien Miller | dfc83f4 | 2000-05-20 15:02:59 +1000 | [diff] [blame] | 186 | #endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */ |
Damien Miller | 78315eb | 2000-09-29 23:01:36 +1100 | [diff] [blame] | 187 | |
Kevin Steves | 0ea1d9d | 2002-04-25 18:17:04 +0000 | [diff] [blame^] | 188 | #ifdef HAVE_SECUREWARE |
| 189 | if ((spw = getprpwnam(pw->pw_name)) != NULL) |
| 190 | pw_password = spw->ufld.fd_encrypt; |
| 191 | #endif /* HAVE_SECUREWARE */ |
| 192 | |
| 193 | #if defined(__hpux) && !defined(HAVE_SECUREWARE) |
Damien Miller | 8a1e6a6 | 2000-09-16 15:55:52 +1100 | [diff] [blame] | 194 | if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL) |
| 195 | pw_password = spw->ufld.fd_encrypt; |
Kevin Steves | 0ea1d9d | 2002-04-25 18:17:04 +0000 | [diff] [blame^] | 196 | #endif /* defined(__hpux) && !defined(HAVE_SECUREWARE) */ |
Damien Miller | 8a1e6a6 | 2000-09-16 15:55:52 +1100 | [diff] [blame] | 197 | |
| 198 | /* Check for users with no password. */ |
| 199 | if ((password[0] == '\0') && (pw_password[0] == '\0')) |
| 200 | return 1; |
Damien Miller | 2e1b082 | 1999-12-25 10:11:29 +1100 | [diff] [blame] | 201 | |
| 202 | if (pw_password[0] != '\0') |
| 203 | salt = pw_password; |
| 204 | else |
| 205 | salt = "xx"; |
| 206 | |
| 207 | #ifdef HAVE_MD5_PASSWORDS |
| 208 | if (is_md5_salt(salt)) |
| 209 | encrypted_password = md5_crypt(password, salt); |
| 210 | else |
| 211 | encrypted_password = crypt(password, salt); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 212 | #else /* HAVE_MD5_PASSWORDS */ |
Kevin Steves | 0ea1d9d | 2002-04-25 18:17:04 +0000 | [diff] [blame^] | 213 | # if defined(__hpux) && !defined(HAVE_SECUREWARE) |
Damien Miller | 8a1e6a6 | 2000-09-16 15:55:52 +1100 | [diff] [blame] | 214 | if (iscomsec()) |
| 215 | encrypted_password = bigcrypt(password, salt); |
| 216 | else |
| 217 | encrypted_password = crypt(password, salt); |
Damien Miller | 1bead33 | 2000-04-30 00:47:29 +1000 | [diff] [blame] | 218 | # else |
Kevin Steves | 0ea1d9d | 2002-04-25 18:17:04 +0000 | [diff] [blame^] | 219 | # ifdef HAVE_SECUREWARE |
Damien Miller | f966109 | 2002-01-03 10:30:56 +1100 | [diff] [blame] | 220 | encrypted_password = bigcrypt(password, salt); |
| 221 | # else |
Damien Miller | 2e1b082 | 1999-12-25 10:11:29 +1100 | [diff] [blame] | 222 | encrypted_password = crypt(password, salt); |
Kevin Steves | 0ea1d9d | 2002-04-25 18:17:04 +0000 | [diff] [blame^] | 223 | # endif /* HAVE_SECUREWARE */ |
| 224 | # endif /* __hpux && !defined(HAVE_SECUREWARE) */ |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 225 | #endif /* HAVE_MD5_PASSWORDS */ |
Damien Miller | 2e1b082 | 1999-12-25 10:11:29 +1100 | [diff] [blame] | 226 | |
| 227 | /* Authentication is accepted if the encrypted passwords are identical. */ |
| 228 | return (strcmp(encrypted_password, pw_password) == 0); |
Damien Miller | b8c656e | 2000-06-28 15:22:41 +1000 | [diff] [blame] | 229 | #endif /* !USE_PAM && !HAVE_OSF_SIA */ |
Kevin Steves | e683e76 | 2002-04-04 19:02:28 +0000 | [diff] [blame] | 230 | } |