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8efc0c15 | 1 | /* |
5260325f | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5260325f | 5 | * Password authentication. This file contains the functions to check whether |
6 | * the password is valid for the user. | |
bcbf86ec | 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 | * | |
bcbf86ec | 14 | * Copyright (c) 1999 Dug Song. All rights reserved. |
bcbf86ec | 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. | |
5260325f | 36 | */ |
8efc0c15 | 37 | |
38 | #include "includes.h" | |
fa1eb020 | 39 | RCSID("$OpenBSD: auth-passwd.c,v 1.24 2002/03/04 12:43:06 markus Exp $"); |
8efc0c15 | 40 | |
4d33e531 | 41 | #if !defined(USE_PAM) && !defined(HAVE_OSF_SIA) |
42 | ||
8efc0c15 | 43 | #include "packet.h" |
42f11eb2 | 44 | #include "log.h" |
45 | #include "servconf.h" | |
59c97189 | 46 | #include "auth.h" |
47 | ||
c2d059b5 | 48 | #ifdef HAVE_CRYPT_H |
49 | # include <crypt.h> | |
50 | #endif | |
4c40f834 | 51 | #ifdef WITH_AIXAUTHENTICATE |
2b763e31 | 52 | # include <login.h> |
53 | #endif | |
0bbfbdeb | 54 | #ifdef __hpux |
2b763e31 | 55 | # include <hpsecurity.h> |
56 | # include <prot.h> | |
4c40f834 | 57 | #endif |
77bb0bca | 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 */ | |
0bbfbdeb | 63 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) |
d94aa2ae | 64 | # include <shadow.h> |
caf3bc51 | 65 | #endif |
0bbfbdeb | 66 | #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) |
a423beaf | 67 | # include <sys/label.h> |
68 | # include <sys/audit.h> | |
69 | # include <pwdadj.h> | |
70 | #endif | |
d94aa2ae | 71 | #if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) |
72 | # include "md5crypt.h" | |
73 | #endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */ | |
caf3bc51 | 74 | |
3c62e7eb | 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 | ||
af774732 | 82 | |
83 | extern ServerOptions options; | |
84 | ||
5260325f | 85 | /* |
86 | * Tries to authenticate the user using password. Returns true if | |
87 | * authentication succeeds. | |
88 | */ | |
6ae2364d | 89 | int |
af774732 | 90 | auth_password(Authctxt *authctxt, const char *password) |
8efc0c15 | 91 | { |
af774732 | 92 | struct passwd * pw = authctxt->pw; |
5260325f | 93 | char *encrypted_password; |
f498ed15 | 94 | char *pw_password; |
95 | char *salt; | |
0bbfbdeb | 96 | #ifdef __hpux |
97 | struct pr_passwd *spw; | |
98 | #endif | |
77bb0bca | 99 | #ifdef HAVE_SCO_PROTECTED_PW |
100 | struct pr_passwd *spw; | |
101 | #endif /* HAVE_SCO_PROTECTED_PW */ | |
0bbfbdeb | 102 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) |
5260325f | 103 | struct spwd *spw; |
b2344d54 | 104 | #endif |
0bbfbdeb | 105 | #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) |
a423beaf | 106 | struct passwd_adjunct *spw; |
107 | #endif | |
4c40f834 | 108 | #ifdef WITH_AIXAUTHENTICATE |
109 | char *authmsg; | |
110 | char *loginmsg; | |
111 | int reenter = 1; | |
112 | #endif | |
8efc0c15 | 113 | |
13f825f4 | 114 | /* deny if no user. */ |
115 | if (pw == NULL) | |
116 | return 0; | |
3c62e7eb | 117 | #ifndef HAVE_CYGWIN |
15853e93 | 118 | if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES) |
5260325f | 119 | return 0; |
3c62e7eb | 120 | #endif |
121 | #ifdef HAVE_CYGWIN | |
122 | /* | |
123 | * Empty password is only possible on NT if the user has _really_ | |
124 | * an empty password and authentication is done, though. | |
125 | */ | |
2b87da3b | 126 | if (!is_winnt) |
3c62e7eb | 127 | #endif |
aa3378df | 128 | if (*password == '\0' && options.permit_empty_passwd == 0) |
5260325f | 129 | return 0; |
ced49be2 | 130 | #ifdef KRB5 |
131 | if (options.kerberos_authentication == 1) { | |
132 | int ret = auth_krb5_password(authctxt, password); | |
133 | if (ret == 1 || ret == 0) | |
134 | return ret; | |
135 | /* Fall back to ordinary passwd authentication. */ | |
136 | } | |
af774732 | 137 | #endif |
3c62e7eb | 138 | #ifdef HAVE_CYGWIN |
139 | if (is_winnt) { | |
140 | HANDLE hToken = cygwin_logon_user(pw, password); | |
141 | ||
142 | if (hToken == INVALID_HANDLE_VALUE) | |
143 | return 0; | |
144 | cygwin_set_impersonation_token(hToken); | |
145 | return 1; | |
146 | } | |
147 | #endif | |
4c40f834 | 148 | #ifdef WITH_AIXAUTHENTICATE |
149 | return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0); | |
150 | #endif | |
57112b5a | 151 | #ifdef KRB4 |
152 | if (options.kerberos_authentication == 1) { | |
ced49be2 | 153 | int ret = auth_krb4_password(authctxt, password); |
57112b5a | 154 | if (ret == 1 || ret == 0) |
155 | return ret; | |
5260325f | 156 | /* Fall back to ordinary passwd authentication. */ |
8efc0c15 | 157 | } |
57112b5a | 158 | #endif |
ced49be2 | 159 | #ifdef BSD_AUTH |
160 | if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh", | |
161 | (char *)password) == 0) | |
162 | return 0; | |
163 | else | |
164 | return 1; | |
165 | #endif | |
0bbfbdeb | 166 | pw_password = pw->pw_passwd; |
8efc0c15 | 167 | |
0bbfbdeb | 168 | /* |
169 | * Various interfaces to shadow or protected password data | |
170 | */ | |
59dd7a31 | 171 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) |
5260325f | 172 | spw = getspnam(pw->pw_name); |
2b87da3b | 173 | if (spw != NULL) |
76b8607f | 174 | pw_password = spw->sp_pwdp; |
f498ed15 | 175 | #endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */ |
77bb0bca | 176 | |
177 | #ifdef HAVE_SCO_PROTECTED_PW | |
178 | spw = getprpwnam(pw->pw_name); | |
2b87da3b | 179 | if (spw != NULL) |
77bb0bca | 180 | pw_password = spw->ufld.fd_encrypt; |
181 | #endif /* HAVE_SCO_PROTECTED_PW */ | |
182 | ||
a423beaf | 183 | #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) |
184 | if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL) | |
a423beaf | 185 | pw_password = spw->pwa_passwd; |
a423beaf | 186 | #endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */ |
77bb0bca | 187 | |
0bbfbdeb | 188 | #if defined(__hpux) |
189 | if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL) | |
190 | pw_password = spw->ufld.fd_encrypt; | |
191 | #endif /* defined(__hpux) */ | |
192 | ||
193 | /* Check for users with no password. */ | |
194 | if ((password[0] == '\0') && (pw_password[0] == '\0')) | |
195 | return 1; | |
b2344d54 | 196 | |
f498ed15 | 197 | if (pw_password[0] != '\0') |
198 | salt = pw_password; | |
5260325f | 199 | else |
f498ed15 | 200 | salt = "xx"; |
59dd7a31 | 201 | |
202 | #ifdef HAVE_MD5_PASSWORDS | |
f498ed15 | 203 | if (is_md5_salt(salt)) |
204 | encrypted_password = md5_crypt(password, salt); | |
59dd7a31 | 205 | else |
f498ed15 | 206 | encrypted_password = crypt(password, salt); |
2b87da3b | 207 | #else /* HAVE_MD5_PASSWORDS */ |
0bbfbdeb | 208 | # ifdef __hpux |
209 | if (iscomsec()) | |
210 | encrypted_password = bigcrypt(password, salt); | |
211 | else | |
212 | encrypted_password = crypt(password, salt); | |
2b763e31 | 213 | # else |
554e28b2 | 214 | # ifdef HAVE_SCO_PROTECTED_PW |
215 | encrypted_password = bigcrypt(password, salt); | |
216 | # else | |
f498ed15 | 217 | encrypted_password = crypt(password, salt); |
554e28b2 | 218 | # endif /* HAVE_SCO_PROTECTED_PW */ |
0bbfbdeb | 219 | # endif /* __hpux */ |
2b87da3b | 220 | #endif /* HAVE_MD5_PASSWORDS */ |
b2344d54 | 221 | |
5260325f | 222 | /* Authentication is accepted if the encrypted passwords are identical. */ |
f498ed15 | 223 | return (strcmp(encrypted_password, pw_password) == 0); |
8efc0c15 | 224 | } |
4d33e531 | 225 | #endif /* !USE_PAM && !HAVE_OSF_SIA */ |