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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" | |
b068eade | 39 | RCSID("$OpenBSD: auth-passwd.c,v 1.31 2004/01/30 09:48:57 markus Exp $"); |
8efc0c15 | 40 | |
41 | #include "packet.h" | |
42f11eb2 | 42 | #include "log.h" |
43 | #include "servconf.h" | |
59c97189 | 44 | #include "auth.h" |
37656beb | 45 | #include "auth-options.h" |
af774732 | 46 | |
47 | extern ServerOptions options; | |
37656beb | 48 | int sys_auth_passwd(Authctxt *, const char *); |
49 | ||
cadfc759 | 50 | void |
37656beb | 51 | disable_forwarding(void) |
52 | { | |
53 | no_port_forwarding_flag = 1; | |
54 | no_agent_forwarding_flag = 1; | |
55 | no_x11_forwarding_flag = 1; | |
56 | } | |
af774732 | 57 | |
5260325f | 58 | /* |
59 | * Tries to authenticate the user using password. Returns true if | |
60 | * authentication succeeds. | |
61 | */ | |
6ae2364d | 62 | int |
af774732 | 63 | auth_password(Authctxt *authctxt, const char *password) |
8efc0c15 | 64 | { |
f656b61e | 65 | struct passwd * pw = authctxt->pw; |
68ece370 | 66 | int ok = authctxt->valid; |
23ef91d3 | 67 | static int expire_checked = 0; |
8efc0c15 | 68 | |
3c62e7eb | 69 | #ifndef HAVE_CYGWIN |
fdaef11e | 70 | if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES) |
68ece370 | 71 | ok = 0; |
3c62e7eb | 72 | #endif |
f656b61e | 73 | if (*password == '\0' && options.permit_empty_passwd == 0) |
68ece370 | 74 | return 0; |
7c6eb32f | 75 | |
76 | #if defined(HAVE_OSF_SIA) | |
37656beb | 77 | /* |
78 | * XXX: any reason this is before krb? could be moved to | |
79 | * sys_auth_passwd()? -dt | |
80 | */ | |
96d0bf74 | 81 | return auth_sia_password(authctxt, password) && ok; |
37656beb | 82 | #endif |
83 | #ifdef KRB5 | |
ced49be2 | 84 | if (options.kerberos_authentication == 1) { |
85 | int ret = auth_krb5_password(authctxt, password); | |
86 | if (ret == 1 || ret == 0) | |
96d0bf74 | 87 | return ret && ok; |
ced49be2 | 88 | /* Fall back to ordinary passwd authentication. */ |
89 | } | |
37656beb | 90 | #endif |
91 | #ifdef HAVE_CYGWIN | |
3c62e7eb | 92 | if (is_winnt) { |
93 | HANDLE hToken = cygwin_logon_user(pw, password); | |
94 | ||
95 | if (hToken == INVALID_HANDLE_VALUE) | |
96d0bf74 | 96 | return 0; |
3c62e7eb | 97 | cygwin_set_impersonation_token(hToken); |
96d0bf74 | 98 | return ok; |
3c62e7eb | 99 | } |
37656beb | 100 | #endif |
d78480be | 101 | #if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE) |
23ef91d3 | 102 | if (!expire_checked) { |
103 | expire_checked = 1; | |
104 | if (auth_shadow_pwexpired(authctxt)) { | |
105 | disable_forwarding(); | |
106 | authctxt->force_pwchange = 1; | |
107 | } | |
5a8bd0c3 | 108 | } |
109 | #endif | |
110 | ||
37656beb | 111 | return (sys_auth_passwd(authctxt, password) && ok); |
112 | } | |
113 | ||
114 | #ifdef BSD_AUTH | |
115 | int | |
116 | sys_auth_passwd(Authctxt *authctxt, const char *password) | |
117 | { | |
118 | struct passwd *pw = authctxt->pw; | |
119 | auth_session_t *as; | |
120 | ||
121 | as = auth_usercheck(pw->pw_name, authctxt->style, "auth-ssh", | |
122 | (char *)password); | |
123 | if (auth_getstate(as) & AUTH_PWEXPIRED) { | |
124 | auth_close(as); | |
125 | disable_forwarding(); | |
126 | authctxt->force_pwchange = 1; | |
127 | return (1); | |
128 | } else { | |
129 | return (auth_close(as)); | |
130 | } | |
131 | } | |
cadfc759 | 132 | #elif !defined(CUSTOM_SYS_AUTH_PASSWD) |
37656beb | 133 | int |
134 | sys_auth_passwd(Authctxt *authctxt, const char *password) | |
135 | { | |
136 | struct passwd *pw = authctxt->pw; | |
137 | char *encrypted_password; | |
138 | ||
96d0bf74 | 139 | /* Just use the supplied fake password if authctxt is invalid */ |
140 | char *pw_password = authctxt->valid ? shadow_pw(pw) : pw->pw_passwd; | |
0bbfbdeb | 141 | |
142 | /* Check for users with no password. */ | |
33fb67f0 | 143 | if (strcmp(pw_password, "") == 0 && strcmp(password, "") == 0) |
37656beb | 144 | return (1); |
7c6eb32f | 145 | |
37656beb | 146 | /* Encrypt the candidate password using the proper salt. */ |
147 | encrypted_password = xcrypt(password, | |
148 | (pw_password[0] && pw_password[1]) ? pw_password : "xx"); | |
b2344d54 | 149 | |
37656beb | 150 | /* |
151 | * Authentication is accepted if the encrypted passwords | |
152 | * are identical. | |
153 | */ | |
154 | return (strcmp(encrypted_password, pw_password) == 0); | |
fde58bd4 | 155 | } |
37656beb | 156 | #endif |