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1 | /* | |
2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> | |
3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland | |
4 | * All rights reserved | |
5 | * Password authentication. This file contains the functions to check whether | |
6 | * the password is valid for the user. | |
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 | * | |
14 | * Copyright (c) 1999 Dug Song. All rights reserved. | |
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. | |
36 | */ | |
37 | ||
38 | #include "includes.h" | |
39 | RCSID("$OpenBSD: auth-passwd.c,v 1.31 2004/01/30 09:48:57 markus Exp $"); | |
40 | ||
41 | #include "packet.h" | |
42 | #include "log.h" | |
43 | #include "servconf.h" | |
44 | #include "auth.h" | |
45 | #include "auth-options.h" | |
46 | ||
47 | extern ServerOptions options; | |
48 | int sys_auth_passwd(Authctxt *, const char *); | |
49 | ||
50 | void | |
51 | disable_forwarding(void) | |
52 | { | |
53 | no_port_forwarding_flag = 1; | |
54 | no_agent_forwarding_flag = 1; | |
55 | no_x11_forwarding_flag = 1; | |
56 | } | |
57 | ||
58 | /* | |
59 | * Tries to authenticate the user using password. Returns true if | |
60 | * authentication succeeds. | |
61 | */ | |
62 | int | |
63 | auth_password(Authctxt *authctxt, const char *password) | |
64 | { | |
65 | struct passwd * pw = authctxt->pw; | |
66 | int ok = authctxt->valid; | |
67 | ||
68 | #ifndef HAVE_CYGWIN | |
69 | if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES) | |
70 | ok = 0; | |
71 | #endif | |
72 | if (*password == '\0' && options.permit_empty_passwd == 0) | |
73 | return 0; | |
74 | ||
75 | #if defined(HAVE_OSF_SIA) | |
76 | /* | |
77 | * XXX: any reason this is before krb? could be moved to | |
78 | * sys_auth_passwd()? -dt | |
79 | */ | |
80 | return auth_sia_password(authctxt, password) && ok; | |
81 | #endif | |
82 | #ifdef KRB5 | |
83 | if (options.kerberos_authentication == 1) { | |
84 | int ret = auth_krb5_password(authctxt, password); | |
85 | if (ret == 1 || ret == 0) | |
86 | return ret && ok; | |
87 | /* Fall back to ordinary passwd authentication. */ | |
88 | } | |
89 | #endif | |
90 | #ifdef HAVE_CYGWIN | |
91 | if (is_winnt) { | |
92 | HANDLE hToken = cygwin_logon_user(pw, password); | |
93 | ||
94 | if (hToken == INVALID_HANDLE_VALUE) | |
95 | return 0; | |
96 | cygwin_set_impersonation_token(hToken); | |
97 | return ok; | |
98 | } | |
99 | #endif | |
100 | #ifdef USE_SHADOW | |
101 | if (auth_shadow_pwexpired(authctxt)) { | |
102 | disable_forwarding(); | |
103 | authctxt->force_pwchange = 1; | |
104 | } | |
105 | #endif | |
106 | ||
107 | return (sys_auth_passwd(authctxt, password) && ok); | |
108 | } | |
109 | ||
110 | #ifdef BSD_AUTH | |
111 | int | |
112 | sys_auth_passwd(Authctxt *authctxt, const char *password) | |
113 | { | |
114 | struct passwd *pw = authctxt->pw; | |
115 | auth_session_t *as; | |
116 | ||
117 | as = auth_usercheck(pw->pw_name, authctxt->style, "auth-ssh", | |
118 | (char *)password); | |
119 | if (auth_getstate(as) & AUTH_PWEXPIRED) { | |
120 | auth_close(as); | |
121 | disable_forwarding(); | |
122 | authctxt->force_pwchange = 1; | |
123 | return (1); | |
124 | } else { | |
125 | return (auth_close(as)); | |
126 | } | |
127 | } | |
128 | #elif !defined(CUSTOM_SYS_AUTH_PASSWD) | |
129 | int | |
130 | sys_auth_passwd(Authctxt *authctxt, const char *password) | |
131 | { | |
132 | struct passwd *pw = authctxt->pw; | |
133 | char *encrypted_password; | |
134 | ||
135 | /* Just use the supplied fake password if authctxt is invalid */ | |
136 | char *pw_password = authctxt->valid ? shadow_pw(pw) : pw->pw_passwd; | |
137 | ||
138 | /* Check for users with no password. */ | |
139 | if (strcmp(pw_password, "") == 0 && strcmp(password, "") == 0) | |
140 | return (1); | |
141 | ||
142 | /* Encrypt the candidate password using the proper salt. */ | |
143 | encrypted_password = xcrypt(password, | |
144 | (pw_password[0] && pw_password[1]) ? pw_password : "xx"); | |
145 | ||
146 | /* | |
147 | * Authentication is accepted if the encrypted passwords | |
148 | * are identical. | |
149 | */ | |
150 | return (strcmp(encrypted_password, pw_password) == 0); | |
151 | } | |
152 | #endif |