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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 1.27 2002/05/24 16:45:16 stevesk Exp $"); | |
40 | ||
41 | #include "packet.h" | |
42 | #include "log.h" | |
43 | #include "servconf.h" | |
44 | #include "auth.h" | |
45 | ||
46 | #if !defined(USE_PAM) && !defined(HAVE_OSF_SIA) | |
47 | /* Don't need any of these headers for the PAM or SIA cases */ | |
48 | # ifdef HAVE_CRYPT_H | |
49 | # include <crypt.h> | |
50 | # endif | |
51 | # ifdef WITH_AIXAUTHENTICATE | |
52 | # include <login.h> | |
53 | # endif | |
54 | # ifdef __hpux | |
55 | # include <hpsecurity.h> | |
56 | # include <prot.h> | |
57 | # endif | |
58 | # ifdef HAVE_SECUREWARE | |
59 | # include <sys/security.h> | |
60 | # include <sys/audit.h> | |
61 | # include <prot.h> | |
62 | # endif /* HAVE_SECUREWARE */ | |
63 | # if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) | |
64 | # include <shadow.h> | |
65 | # endif | |
66 | # if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) | |
67 | # include <sys/label.h> | |
68 | # include <sys/audit.h> | |
69 | # include <pwdadj.h> | |
70 | # endif | |
71 | # if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) | |
72 | # include "md5crypt.h" | |
73 | # endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */ | |
74 | ||
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 | #endif /* !USE_PAM && !HAVE_OSF_SIA */ | |
82 | ||
83 | extern ServerOptions options; | |
84 | ||
85 | /* | |
86 | * Tries to authenticate the user using password. Returns true if | |
87 | * authentication succeeds. | |
88 | */ | |
89 | int | |
90 | auth_password(Authctxt *authctxt, const char *password) | |
91 | { | |
92 | #if defined(USE_PAM) | |
93 | if (*password == '\0' && options.permit_empty_passwd == 0) | |
94 | return 0; | |
95 | return auth_pam_password(authctxt, password); | |
96 | #elif defined(HAVE_OSF_SIA) | |
97 | if (*password == '\0' && options.permit_empty_passwd == 0) | |
98 | return 0; | |
99 | return auth_sia_password(authctxt, password); | |
100 | #else | |
101 | struct passwd * pw = authctxt->pw; | |
102 | char *encrypted_password; | |
103 | char *pw_password; | |
104 | char *salt; | |
105 | #if defined(__hpux) || defined(HAVE_SECUREWARE) | |
106 | struct pr_passwd *spw; | |
107 | #endif /* __hpux || HAVE_SECUREWARE */ | |
108 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) | |
109 | struct spwd *spw; | |
110 | #endif | |
111 | #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) | |
112 | struct passwd_adjunct *spw; | |
113 | #endif | |
114 | #ifdef WITH_AIXAUTHENTICATE | |
115 | char *authmsg; | |
116 | char *loginmsg; | |
117 | int reenter = 1; | |
118 | #endif | |
119 | ||
120 | /* deny if no user. */ | |
121 | if (pw == NULL) | |
122 | return 0; | |
123 | #ifndef HAVE_CYGWIN | |
124 | if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES) | |
125 | return 0; | |
126 | #endif | |
127 | if (*password == '\0' && options.permit_empty_passwd == 0) | |
128 | return 0; | |
129 | #ifdef KRB5 | |
130 | if (options.kerberos_authentication == 1) { | |
131 | int ret = auth_krb5_password(authctxt, password); | |
132 | if (ret == 1 || ret == 0) | |
133 | return ret; | |
134 | /* Fall back to ordinary passwd authentication. */ | |
135 | } | |
136 | #endif | |
137 | #ifdef HAVE_CYGWIN | |
138 | if (is_winnt) { | |
139 | HANDLE hToken = cygwin_logon_user(pw, password); | |
140 | ||
141 | if (hToken == INVALID_HANDLE_VALUE) | |
142 | return 0; | |
143 | cygwin_set_impersonation_token(hToken); | |
144 | return 1; | |
145 | } | |
146 | #endif | |
147 | #ifdef WITH_AIXAUTHENTICATE | |
148 | return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0); | |
149 | #endif | |
150 | #ifdef KRB4 | |
151 | if (options.kerberos_authentication == 1) { | |
152 | int ret = auth_krb4_password(authctxt, password); | |
153 | if (ret == 1 || ret == 0) | |
154 | return ret; | |
155 | /* Fall back to ordinary passwd authentication. */ | |
156 | } | |
157 | #endif | |
158 | #ifdef BSD_AUTH | |
159 | if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh", | |
160 | (char *)password) == 0) | |
161 | return 0; | |
162 | else | |
163 | return 1; | |
164 | #endif | |
165 | pw_password = pw->pw_passwd; | |
166 | ||
167 | /* | |
168 | * Various interfaces to shadow or protected password data | |
169 | */ | |
170 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) | |
171 | spw = getspnam(pw->pw_name); | |
172 | if (spw != NULL) | |
173 | pw_password = spw->sp_pwdp; | |
174 | #endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */ | |
175 | ||
176 | #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) | |
177 | if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL) | |
178 | pw_password = spw->pwa_passwd; | |
179 | #endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */ | |
180 | ||
181 | #ifdef HAVE_SECUREWARE | |
182 | if ((spw = getprpwnam(pw->pw_name)) != NULL) | |
183 | pw_password = spw->ufld.fd_encrypt; | |
184 | #endif /* HAVE_SECUREWARE */ | |
185 | ||
186 | #if defined(__hpux) && !defined(HAVE_SECUREWARE) | |
187 | if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL) | |
188 | pw_password = spw->ufld.fd_encrypt; | |
189 | #endif /* defined(__hpux) && !defined(HAVE_SECUREWARE) */ | |
190 | ||
191 | /* Check for users with no password. */ | |
192 | if ((password[0] == '\0') && (pw_password[0] == '\0')) | |
193 | return 1; | |
194 | ||
195 | if (pw_password[0] != '\0') | |
196 | salt = pw_password; | |
197 | else | |
198 | salt = "xx"; | |
199 | ||
200 | #ifdef HAVE_MD5_PASSWORDS | |
201 | if (is_md5_salt(salt)) | |
202 | encrypted_password = md5_crypt(password, salt); | |
203 | else | |
204 | encrypted_password = crypt(password, salt); | |
205 | #else /* HAVE_MD5_PASSWORDS */ | |
206 | # if defined(__hpux) && !defined(HAVE_SECUREWARE) | |
207 | if (iscomsec()) | |
208 | encrypted_password = bigcrypt(password, salt); | |
209 | else | |
210 | encrypted_password = crypt(password, salt); | |
211 | # else | |
212 | # ifdef HAVE_SECUREWARE | |
213 | encrypted_password = bigcrypt(password, salt); | |
214 | # else | |
215 | encrypted_password = crypt(password, salt); | |
216 | # endif /* HAVE_SECUREWARE */ | |
217 | # endif /* __hpux && !defined(HAVE_SECUREWARE) */ | |
218 | #endif /* HAVE_MD5_PASSWORDS */ | |
219 | ||
220 | /* Authentication is accepted if the encrypted passwords are identical. */ | |
221 | return (strcmp(encrypted_password, pw_password) == 0); | |
222 | #endif /* !USE_PAM && !HAVE_OSF_SIA */ | |
223 | } |