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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 | * | |
15 | * Copyright (c) 1999 Dug Song. 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 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
39 | * | |
40 | * Redistribution and use in source and binary forms, with or without | |
41 | * modification, are permitted provided that the following conditions | |
42 | * are met: | |
43 | * 1. Redistributions of source code must retain the above copyright | |
44 | * notice, this list of conditions and the following disclaimer. | |
45 | * 2. Redistributions in binary form must reproduce the above copyright | |
46 | * notice, this list of conditions and the following disclaimer in the | |
47 | * documentation and/or other materials provided with the distribution. | |
48 | * | |
49 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
50 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
51 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
52 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
53 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
54 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
55 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
56 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
57 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
58 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
59 | */ | |
60 | ||
61 | #include "includes.h" | |
62 | RCSID("$OpenBSD: auth-passwd.c,v 1.18 2000/10/03 18:03:03 markus Exp $"); | |
63 | ||
64 | #if !defined(USE_PAM) && !defined(HAVE_OSF_SIA) | |
65 | ||
66 | #include "packet.h" | |
67 | #include "ssh.h" | |
68 | #include "servconf.h" | |
69 | #include "xmalloc.h" | |
70 | ||
71 | #ifdef WITH_AIXAUTHENTICATE | |
72 | # include <login.h> | |
73 | #endif | |
74 | #ifdef __hpux | |
75 | # include <hpsecurity.h> | |
76 | # include <prot.h> | |
77 | #endif | |
78 | #ifdef HAVE_SCO_PROTECTED_PW | |
79 | # include <sys/security.h> | |
80 | # include <sys/audit.h> | |
81 | # include <prot.h> | |
82 | #endif /* HAVE_SCO_PROTECTED_PW */ | |
83 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) | |
84 | # include <shadow.h> | |
85 | #endif | |
86 | #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) | |
87 | # include <sys/label.h> | |
88 | # include <sys/audit.h> | |
89 | # include <pwdadj.h> | |
90 | #endif | |
91 | #if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) | |
92 | # include "md5crypt.h" | |
93 | #endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */ | |
94 | ||
95 | #ifdef HAVE_CYGWIN | |
96 | #undef ERROR | |
97 | #include <windows.h> | |
98 | #include <sys/cygwin.h> | |
99 | #define is_winnt (GetVersion() < 0x80000000) | |
100 | #endif | |
101 | ||
102 | /* | |
103 | * Tries to authenticate the user using password. Returns true if | |
104 | * authentication succeeds. | |
105 | */ | |
106 | int | |
107 | auth_password(struct passwd * pw, const char *password) | |
108 | { | |
109 | extern ServerOptions options; | |
110 | char *encrypted_password; | |
111 | char *pw_password; | |
112 | char *salt; | |
113 | #ifdef __hpux | |
114 | struct pr_passwd *spw; | |
115 | #endif | |
116 | #ifdef HAVE_SCO_PROTECTED_PW | |
117 | struct pr_passwd *spw; | |
118 | #endif /* HAVE_SCO_PROTECTED_PW */ | |
119 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) | |
120 | struct spwd *spw; | |
121 | #endif | |
122 | #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) | |
123 | struct passwd_adjunct *spw; | |
124 | #endif | |
125 | #ifdef WITH_AIXAUTHENTICATE | |
126 | char *authmsg; | |
127 | char *loginmsg; | |
128 | int reenter = 1; | |
129 | #endif | |
130 | ||
131 | /* deny if no user. */ | |
132 | if (pw == NULL) | |
133 | return 0; | |
134 | #ifndef HAVE_CYGWIN | |
135 | if (pw->pw_uid == 0 && options.permit_root_login == 2) | |
136 | return 0; | |
137 | #endif | |
138 | #ifdef HAVE_CYGWIN | |
139 | /* | |
140 | * Empty password is only possible on NT if the user has _really_ | |
141 | * an empty password and authentication is done, though. | |
142 | */ | |
143 | if (!is_winnt) | |
144 | #endif | |
145 | if (*password == '\0' && options.permit_empty_passwd == 0) | |
146 | return 0; | |
147 | ||
148 | #ifdef HAVE_CYGWIN | |
149 | if (is_winnt) { | |
150 | HANDLE hToken = cygwin_logon_user(pw, password); | |
151 | ||
152 | if (hToken == INVALID_HANDLE_VALUE) | |
153 | return 0; | |
154 | cygwin_set_impersonation_token(hToken); | |
155 | return 1; | |
156 | } | |
157 | #endif | |
158 | ||
159 | #ifdef SKEY_VIA_PASSWD_IS_DISABLED | |
160 | if (options.skey_authentication == 1) { | |
161 | int ret = auth_skey_password(pw, password); | |
162 | if (ret == 1 || ret == 0) | |
163 | return ret; | |
164 | /* Fall back to ordinary passwd authentication. */ | |
165 | } | |
166 | #endif | |
167 | ||
168 | #ifdef WITH_AIXAUTHENTICATE | |
169 | return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0); | |
170 | #endif | |
171 | ||
172 | #ifdef KRB4 | |
173 | if (options.kerberos_authentication == 1) { | |
174 | int ret = auth_krb4_password(pw, password); | |
175 | if (ret == 1 || ret == 0) | |
176 | return ret; | |
177 | /* Fall back to ordinary passwd authentication. */ | |
178 | } | |
179 | #endif | |
180 | ||
181 | ||
182 | pw_password = pw->pw_passwd; | |
183 | ||
184 | /* | |
185 | * Various interfaces to shadow or protected password data | |
186 | */ | |
187 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) | |
188 | spw = getspnam(pw->pw_name); | |
189 | if (spw != NULL) | |
190 | pw_password = spw->sp_pwdp; | |
191 | #endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */ | |
192 | ||
193 | #ifdef HAVE_SCO_PROTECTED_PW | |
194 | spw = getprpwnam(pw->pw_name); | |
195 | if (spw != NULL) | |
196 | pw_password = spw->ufld.fd_encrypt; | |
197 | #endif /* HAVE_SCO_PROTECTED_PW */ | |
198 | ||
199 | #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) | |
200 | if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL) | |
201 | pw_password = spw->pwa_passwd; | |
202 | #endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */ | |
203 | ||
204 | #if defined(__hpux) | |
205 | if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL) | |
206 | pw_password = spw->ufld.fd_encrypt; | |
207 | #endif /* defined(__hpux) */ | |
208 | ||
209 | /* Check for users with no password. */ | |
210 | if ((password[0] == '\0') && (pw_password[0] == '\0')) | |
211 | return 1; | |
212 | ||
213 | if (pw_password[0] != '\0') | |
214 | salt = pw_password; | |
215 | else | |
216 | salt = "xx"; | |
217 | ||
218 | #ifdef HAVE_MD5_PASSWORDS | |
219 | if (is_md5_salt(salt)) | |
220 | encrypted_password = md5_crypt(password, salt); | |
221 | else | |
222 | encrypted_password = crypt(password, salt); | |
223 | #else /* HAVE_MD5_PASSWORDS */ | |
224 | # ifdef __hpux | |
225 | if (iscomsec()) | |
226 | encrypted_password = bigcrypt(password, salt); | |
227 | else | |
228 | encrypted_password = crypt(password, salt); | |
229 | # else | |
230 | encrypted_password = crypt(password, salt); | |
231 | # endif /* __hpux */ | |
232 | #endif /* HAVE_MD5_PASSWORDS */ | |
233 | ||
234 | /* Authentication is accepted if the encrypted passwords are identical. */ | |
235 | return (strcmp(encrypted_password, pw_password) == 0); | |
236 | } | |
237 | #endif /* !USE_PAM && !HAVE_OSF_SIA */ |