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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" | |
d9891c59 | 39 | RCSID("$OpenBSD: auth-passwd.c,v 1.25 2002/05/06 23:00:59 mouring Exp $"); |
8efc0c15 | 40 | |
41 | #include "packet.h" | |
42f11eb2 | 42 | #include "log.h" |
43 | #include "servconf.h" | |
59c97189 | 44 | #include "auth.h" |
45 | ||
fde58bd4 | 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 | |
6e879cb4 | 58 | # ifdef HAVE_SECUREWARE |
fde58bd4 | 59 | # include <sys/security.h> |
60 | # include <sys/audit.h> | |
61 | # include <prot.h> | |
6e879cb4 | 62 | # endif /* HAVE_SECUREWARE */ |
fde58bd4 | 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 */ | |
af774732 | 82 | |
83 | extern ServerOptions options; | |
84 | ||
5260325f | 85 | /* |
86 | * Tries to authenticate the user using password. Returns true if | |
87 | * authentication succeeds. | |
88 | */ | |
6ae2364d | 89 | int |
af774732 | 90 | auth_password(Authctxt *authctxt, const char *password) |
8efc0c15 | 91 | { |
69406cab | 92 | struct passwd * pw = authctxt->pw; |
fde58bd4 | 93 | #if defined(USE_PAM) |
d9891c59 | 94 | if (*pw->pw_passwd == '\0' && options.permit_empty_passwd == 0) |
fde58bd4 | 95 | return 0; |
96 | return auth_pam_password(authctxt, password); | |
97 | #elif defined(HAVE_OSF_SIA) | |
d9891c59 | 98 | if (*pw->pw_passwd == '\0' && options.permit_empty_passwd == 0) |
fde58bd4 | 99 | return 0; |
100 | return auth_sia_password(authctxt, password); | |
101 | #else | |
5260325f | 102 | char *encrypted_password; |
f498ed15 | 103 | char *pw_password; |
104 | char *salt; | |
6e879cb4 | 105 | #if defined(__hpux) || defined(HAVE_SECUREWARE) |
0bbfbdeb | 106 | struct pr_passwd *spw; |
6e879cb4 | 107 | #endif /* __hpux || HAVE_SECUREWARE */ |
0bbfbdeb | 108 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) |
5260325f | 109 | struct spwd *spw; |
b2344d54 | 110 | #endif |
0bbfbdeb | 111 | #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) |
a423beaf | 112 | struct passwd_adjunct *spw; |
113 | #endif | |
4c40f834 | 114 | #ifdef WITH_AIXAUTHENTICATE |
115 | char *authmsg; | |
116 | char *loginmsg; | |
117 | int reenter = 1; | |
118 | #endif | |
8efc0c15 | 119 | |
13f825f4 | 120 | /* deny if no user. */ |
121 | if (pw == NULL) | |
122 | return 0; | |
3c62e7eb | 123 | #ifndef HAVE_CYGWIN |
15853e93 | 124 | if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES) |
5260325f | 125 | return 0; |
3c62e7eb | 126 | #endif |
127 | #ifdef HAVE_CYGWIN | |
128 | /* | |
129 | * Empty password is only possible on NT if the user has _really_ | |
130 | * an empty password and authentication is done, though. | |
131 | */ | |
2b87da3b | 132 | if (!is_winnt) |
3c62e7eb | 133 | #endif |
d9891c59 | 134 | if (*pw->pw_passwd == '\0' && options.permit_empty_passwd == 0) |
5260325f | 135 | return 0; |
ced49be2 | 136 | #ifdef KRB5 |
137 | if (options.kerberos_authentication == 1) { | |
138 | int ret = auth_krb5_password(authctxt, password); | |
139 | if (ret == 1 || ret == 0) | |
140 | return ret; | |
141 | /* Fall back to ordinary passwd authentication. */ | |
142 | } | |
af774732 | 143 | #endif |
3c62e7eb | 144 | #ifdef HAVE_CYGWIN |
145 | if (is_winnt) { | |
146 | HANDLE hToken = cygwin_logon_user(pw, password); | |
147 | ||
148 | if (hToken == INVALID_HANDLE_VALUE) | |
149 | return 0; | |
150 | cygwin_set_impersonation_token(hToken); | |
151 | return 1; | |
152 | } | |
153 | #endif | |
4c40f834 | 154 | #ifdef WITH_AIXAUTHENTICATE |
155 | return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0); | |
156 | #endif | |
57112b5a | 157 | #ifdef KRB4 |
158 | if (options.kerberos_authentication == 1) { | |
ced49be2 | 159 | int ret = auth_krb4_password(authctxt, password); |
57112b5a | 160 | if (ret == 1 || ret == 0) |
161 | return ret; | |
5260325f | 162 | /* Fall back to ordinary passwd authentication. */ |
8efc0c15 | 163 | } |
57112b5a | 164 | #endif |
ced49be2 | 165 | #ifdef BSD_AUTH |
166 | if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh", | |
167 | (char *)password) == 0) | |
168 | return 0; | |
169 | else | |
170 | return 1; | |
171 | #endif | |
0bbfbdeb | 172 | pw_password = pw->pw_passwd; |
8efc0c15 | 173 | |
0bbfbdeb | 174 | /* |
175 | * Various interfaces to shadow or protected password data | |
176 | */ | |
59dd7a31 | 177 | #if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) |
5260325f | 178 | spw = getspnam(pw->pw_name); |
2b87da3b | 179 | if (spw != NULL) |
76b8607f | 180 | pw_password = spw->sp_pwdp; |
f498ed15 | 181 | #endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */ |
77bb0bca | 182 | |
a423beaf | 183 | #if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) |
184 | if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL) | |
a423beaf | 185 | pw_password = spw->pwa_passwd; |
a423beaf | 186 | #endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */ |
77bb0bca | 187 | |
6e879cb4 | 188 | #ifdef HAVE_SECUREWARE |
189 | if ((spw = getprpwnam(pw->pw_name)) != NULL) | |
190 | pw_password = spw->ufld.fd_encrypt; | |
191 | #endif /* HAVE_SECUREWARE */ | |
192 | ||
193 | #if defined(__hpux) && !defined(HAVE_SECUREWARE) | |
0bbfbdeb | 194 | if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL) |
195 | pw_password = spw->ufld.fd_encrypt; | |
6e879cb4 | 196 | #endif /* defined(__hpux) && !defined(HAVE_SECUREWARE) */ |
0bbfbdeb | 197 | |
198 | /* Check for users with no password. */ | |
199 | if ((password[0] == '\0') && (pw_password[0] == '\0')) | |
200 | return 1; | |
b2344d54 | 201 | |
f498ed15 | 202 | if (pw_password[0] != '\0') |
203 | salt = pw_password; | |
5260325f | 204 | else |
f498ed15 | 205 | salt = "xx"; |
59dd7a31 | 206 | |
207 | #ifdef HAVE_MD5_PASSWORDS | |
f498ed15 | 208 | if (is_md5_salt(salt)) |
209 | encrypted_password = md5_crypt(password, salt); | |
59dd7a31 | 210 | else |
f498ed15 | 211 | encrypted_password = crypt(password, salt); |
2b87da3b | 212 | #else /* HAVE_MD5_PASSWORDS */ |
6e879cb4 | 213 | # if defined(__hpux) && !defined(HAVE_SECUREWARE) |
0bbfbdeb | 214 | if (iscomsec()) |
215 | encrypted_password = bigcrypt(password, salt); | |
216 | else | |
217 | encrypted_password = crypt(password, salt); | |
2b763e31 | 218 | # else |
6e879cb4 | 219 | # ifdef HAVE_SECUREWARE |
554e28b2 | 220 | encrypted_password = bigcrypt(password, salt); |
221 | # else | |
f498ed15 | 222 | encrypted_password = crypt(password, salt); |
6e879cb4 | 223 | # endif /* HAVE_SECUREWARE */ |
224 | # endif /* __hpux && !defined(HAVE_SECUREWARE) */ | |
2b87da3b | 225 | #endif /* HAVE_MD5_PASSWORDS */ |
b2344d54 | 226 | |
5260325f | 227 | /* Authentication is accepted if the encrypted passwords are identical. */ |
f498ed15 | 228 | return (strcmp(encrypted_password, pw_password) == 0); |
4d33e531 | 229 | #endif /* !USE_PAM && !HAVE_OSF_SIA */ |
fde58bd4 | 230 | } |