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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" | |
15853e93 | 39 | RCSID("$OpenBSD: auth-passwd.c,v 1.21 2001/02/12 16:16:23 markus Exp $"); |
8efc0c15 | 40 | |
4d33e531 | 41 | #if !defined(USE_PAM) && !defined(HAVE_OSF_SIA) |
42 | ||
8efc0c15 | 43 | #include "packet.h" |
8efc0c15 | 44 | #include "xmalloc.h" |
42f11eb2 | 45 | #include "log.h" |
46 | #include "servconf.h" | |
59c97189 | 47 | #include "auth.h" |
48 | ||
4c40f834 | 49 | #ifdef WITH_AIXAUTHENTICATE |
2b763e31 | 50 | # include <login.h> |
51 | #endif | |
0bbfbdeb | 52 | #ifdef __hpux |
2b763e31 | 53 | # include <hpsecurity.h> |
54 | # include <prot.h> | |
4c40f834 | 55 | #endif |
77bb0bca | 56 | #ifdef HAVE_SCO_PROTECTED_PW |
57 | # include <sys/security.h> | |
58 | # include <sys/audit.h> | |
59 | # include <prot.h> | |
60 | #endif /* HAVE_SCO_PROTECTED_PW */ | |
0bbfbdeb | 61 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) |
d94aa2ae | 62 | # include <shadow.h> |
caf3bc51 | 63 | #endif |
0bbfbdeb | 64 | #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) |
a423beaf | 65 | # include <sys/label.h> |
66 | # include <sys/audit.h> | |
67 | # include <pwdadj.h> | |
68 | #endif | |
d94aa2ae | 69 | #if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) |
70 | # include "md5crypt.h" | |
71 | #endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */ | |
caf3bc51 | 72 | |
3c62e7eb | 73 | #ifdef HAVE_CYGWIN |
74 | #undef ERROR | |
75 | #include <windows.h> | |
76 | #include <sys/cygwin.h> | |
77 | #define is_winnt (GetVersion() < 0x80000000) | |
78 | #endif | |
79 | ||
af774732 | 80 | |
81 | extern ServerOptions options; | |
82 | ||
5260325f | 83 | /* |
84 | * Tries to authenticate the user using password. Returns true if | |
85 | * authentication succeeds. | |
86 | */ | |
6ae2364d | 87 | int |
af774732 | 88 | auth_password(Authctxt *authctxt, const char *password) |
8efc0c15 | 89 | { |
af774732 | 90 | struct passwd * pw = authctxt->pw; |
5260325f | 91 | char *encrypted_password; |
f498ed15 | 92 | char *pw_password; |
93 | char *salt; | |
0bbfbdeb | 94 | #ifdef __hpux |
95 | struct pr_passwd *spw; | |
96 | #endif | |
77bb0bca | 97 | #ifdef HAVE_SCO_PROTECTED_PW |
98 | struct pr_passwd *spw; | |
99 | #endif /* HAVE_SCO_PROTECTED_PW */ | |
0bbfbdeb | 100 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) |
5260325f | 101 | struct spwd *spw; |
b2344d54 | 102 | #endif |
0bbfbdeb | 103 | #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) |
a423beaf | 104 | struct passwd_adjunct *spw; |
105 | #endif | |
4c40f834 | 106 | #ifdef WITH_AIXAUTHENTICATE |
107 | char *authmsg; | |
108 | char *loginmsg; | |
109 | int reenter = 1; | |
110 | #endif | |
8efc0c15 | 111 | |
13f825f4 | 112 | /* deny if no user. */ |
113 | if (pw == NULL) | |
114 | return 0; | |
3c62e7eb | 115 | #ifndef HAVE_CYGWIN |
15853e93 | 116 | if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES) |
5260325f | 117 | return 0; |
3c62e7eb | 118 | #endif |
119 | #ifdef HAVE_CYGWIN | |
120 | /* | |
121 | * Empty password is only possible on NT if the user has _really_ | |
122 | * an empty password and authentication is done, though. | |
123 | */ | |
2b87da3b | 124 | if (!is_winnt) |
3c62e7eb | 125 | #endif |
aa3378df | 126 | if (*password == '\0' && options.permit_empty_passwd == 0) |
5260325f | 127 | return 0; |
af774732 | 128 | #ifdef BSD_AUTH |
129 | if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh", | |
130 | (char *)password) == 0) | |
131 | return 0; | |
132 | else | |
133 | return 1; | |
134 | #endif | |
8efc0c15 | 135 | |
3c62e7eb | 136 | #ifdef HAVE_CYGWIN |
137 | if (is_winnt) { | |
138 | HANDLE hToken = cygwin_logon_user(pw, password); | |
139 | ||
140 | if (hToken == INVALID_HANDLE_VALUE) | |
141 | return 0; | |
142 | cygwin_set_impersonation_token(hToken); | |
143 | return 1; | |
144 | } | |
145 | #endif | |
146 | ||
4c40f834 | 147 | #ifdef WITH_AIXAUTHENTICATE |
148 | return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0); | |
149 | #endif | |
150 | ||
57112b5a | 151 | #ifdef KRB4 |
152 | if (options.kerberos_authentication == 1) { | |
153 | int ret = auth_krb4_password(pw, password); | |
154 | if (ret == 1 || ret == 0) | |
155 | return ret; | |
5260325f | 156 | /* Fall back to ordinary passwd authentication. */ |
8efc0c15 | 157 | } |
57112b5a | 158 | #endif |
5260325f | 159 | |
7f8f5e00 | 160 | |
0bbfbdeb | 161 | pw_password = pw->pw_passwd; |
8efc0c15 | 162 | |
0bbfbdeb | 163 | /* |
164 | * Various interfaces to shadow or protected password data | |
165 | */ | |
59dd7a31 | 166 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) |
5260325f | 167 | spw = getspnam(pw->pw_name); |
2b87da3b | 168 | if (spw != NULL) |
76b8607f | 169 | pw_password = spw->sp_pwdp; |
f498ed15 | 170 | #endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */ |
77bb0bca | 171 | |
172 | #ifdef HAVE_SCO_PROTECTED_PW | |
173 | spw = getprpwnam(pw->pw_name); | |
2b87da3b | 174 | if (spw != NULL) |
77bb0bca | 175 | pw_password = spw->ufld.fd_encrypt; |
176 | #endif /* HAVE_SCO_PROTECTED_PW */ | |
177 | ||
a423beaf | 178 | #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) |
179 | if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL) | |
a423beaf | 180 | pw_password = spw->pwa_passwd; |
a423beaf | 181 | #endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */ |
77bb0bca | 182 | |
0bbfbdeb | 183 | #if defined(__hpux) |
184 | if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL) | |
185 | pw_password = spw->ufld.fd_encrypt; | |
186 | #endif /* defined(__hpux) */ | |
187 | ||
188 | /* Check for users with no password. */ | |
189 | if ((password[0] == '\0') && (pw_password[0] == '\0')) | |
190 | return 1; | |
b2344d54 | 191 | |
f498ed15 | 192 | if (pw_password[0] != '\0') |
193 | salt = pw_password; | |
5260325f | 194 | else |
f498ed15 | 195 | salt = "xx"; |
59dd7a31 | 196 | |
197 | #ifdef HAVE_MD5_PASSWORDS | |
f498ed15 | 198 | if (is_md5_salt(salt)) |
199 | encrypted_password = md5_crypt(password, salt); | |
59dd7a31 | 200 | else |
f498ed15 | 201 | encrypted_password = crypt(password, salt); |
2b87da3b | 202 | #else /* HAVE_MD5_PASSWORDS */ |
0bbfbdeb | 203 | # ifdef __hpux |
204 | if (iscomsec()) | |
205 | encrypted_password = bigcrypt(password, salt); | |
206 | else | |
207 | encrypted_password = crypt(password, salt); | |
2b763e31 | 208 | # else |
f498ed15 | 209 | encrypted_password = crypt(password, salt); |
0bbfbdeb | 210 | # endif /* __hpux */ |
2b87da3b | 211 | #endif /* HAVE_MD5_PASSWORDS */ |
b2344d54 | 212 | |
5260325f | 213 | /* Authentication is accepted if the encrypted passwords are identical. */ |
f498ed15 | 214 | return (strcmp(encrypted_password, pw_password) == 0); |
8efc0c15 | 215 | } |
4d33e531 | 216 | #endif /* !USE_PAM && !HAVE_OSF_SIA */ |