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3c0ef626 | 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" | |
12408a1b | 39 | RCSID("$OpenBSD: auth-passwd.c,v 1.30 2003/11/04 08:54:09 djm Exp $"); |
3c0ef626 | 40 | |
41 | #include "packet.h" | |
3c0ef626 | 42 | #include "log.h" |
43 | #include "servconf.h" | |
44 | #include "auth.h" | |
41b2f314 | 45 | #ifdef WITH_AIXAUTHENTICATE |
0fff78ff | 46 | # include "canohost.h" |
41b2f314 | 47 | #endif |
3c0ef626 | 48 | |
0fff78ff | 49 | extern ServerOptions options; |
50 | ||
3c0ef626 | 51 | /* |
52 | * Tries to authenticate the user using password. Returns true if | |
53 | * authentication succeeds. | |
54 | */ | |
55 | int | |
56 | auth_password(Authctxt *authctxt, const char *password) | |
57 | { | |
58 | struct passwd * pw = authctxt->pw; | |
7e772e1f | 59 | int ok = authctxt->valid; |
3c0ef626 | 60 | |
3c0ef626 | 61 | #ifndef HAVE_CYGWIN |
12408a1b | 62 | if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES) |
7e772e1f | 63 | ok = 0; |
3c0ef626 | 64 | #endif |
65 | if (*password == '\0' && options.permit_empty_passwd == 0) | |
7e772e1f | 66 | return 0; |
0fff78ff | 67 | |
68 | #if defined(HAVE_OSF_SIA) | |
69 | return auth_sia_password(authctxt, password) && ok; | |
6a9b3198 | 70 | #else |
71 | # ifdef KRB5 | |
3c0ef626 | 72 | if (options.kerberos_authentication == 1) { |
73 | int ret = auth_krb5_password(authctxt, password); | |
74 | if (ret == 1 || ret == 0) | |
0fff78ff | 75 | return ret && ok; |
3c0ef626 | 76 | /* Fall back to ordinary passwd authentication. */ |
77 | } | |
6a9b3198 | 78 | # endif |
79 | # ifdef HAVE_CYGWIN | |
3c0ef626 | 80 | if (is_winnt) { |
81 | HANDLE hToken = cygwin_logon_user(pw, password); | |
82 | ||
83 | if (hToken == INVALID_HANDLE_VALUE) | |
84 | return 0; | |
85 | cygwin_set_impersonation_token(hToken); | |
0fff78ff | 86 | return ok; |
3c0ef626 | 87 | } |
6a9b3198 | 88 | # endif |
89 | # ifdef WITH_AIXAUTHENTICATE | |
12408a1b | 90 | if (aix_authenticate(pw->pw_name, password, |
91 | get_canonical_hostname(options.use_dns)) == 0) | |
92 | return 0; | |
93 | else | |
94 | return ok; | |
6a9b3198 | 95 | # endif |
96 | # ifdef BSD_AUTH | |
3c0ef626 | 97 | if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh", |
98 | (char *)password) == 0) | |
99 | return 0; | |
100 | else | |
0fff78ff | 101 | return ok; |
102 | # else | |
103 | { | |
104 | /* Just use the supplied fake password if authctxt is invalid */ | |
105 | char *pw_password = authctxt->valid ? shadow_pw(pw) : pw->pw_passwd; | |
3c0ef626 | 106 | |
107 | /* Check for users with no password. */ | |
acc3d05e | 108 | if (strcmp(pw_password, "") == 0 && strcmp(password, "") == 0) |
0fff78ff | 109 | return ok; |
110 | else { | |
111 | /* Encrypt the candidate password using the proper salt. */ | |
112 | char *encrypted_password = xcrypt(password, | |
113 | (pw_password[0] && pw_password[1]) ? pw_password : "xx"); | |
114 | ||
115 | /* | |
116 | * Authentication is accepted if the encrypted passwords | |
117 | * are identical. | |
118 | */ | |
119 | return (strcmp(encrypted_password, pw_password) == 0) && ok; | |
120 | } | |
3c0ef626 | 121 | |
0fff78ff | 122 | } |
123 | # endif | |
124 | #endif /* !HAVE_OSF_SIA */ | |
700318f3 | 125 | } |