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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" | |
996d5e62 | 39 | RCSID("$OpenBSD: auth-passwd.c,v 1.33 2005/01/24 11:47:13 dtucker Exp $"); |
3c0ef626 | 40 | |
41 | #include "packet.h" | |
996d5e62 | 42 | #include "buffer.h" |
3c0ef626 | 43 | #include "log.h" |
44 | #include "servconf.h" | |
45 | #include "auth.h" | |
cdd66111 | 46 | #include "auth-options.h" |
3c0ef626 | 47 | |
996d5e62 | 48 | extern Buffer loginmsg; |
0fff78ff | 49 | extern ServerOptions options; |
cdd66111 | 50 | int sys_auth_passwd(Authctxt *, const char *); |
51 | ||
996d5e62 | 52 | #ifdef HAVE_LOGIN_CAP |
53 | extern login_cap_t *lc; | |
54 | #endif | |
55 | ||
56 | ||
57 | #define DAY (24L * 60 * 60) /* 1 day in seconds */ | |
58 | #define TWO_WEEKS (2L * 7 * DAY) /* 2 weeks in seconds */ | |
59 | ||
cdd66111 | 60 | void |
61 | disable_forwarding(void) | |
62 | { | |
63 | no_port_forwarding_flag = 1; | |
64 | no_agent_forwarding_flag = 1; | |
65 | no_x11_forwarding_flag = 1; | |
66 | } | |
0fff78ff | 67 | |
3c0ef626 | 68 | /* |
69 | * Tries to authenticate the user using password. Returns true if | |
70 | * authentication succeeds. | |
71 | */ | |
72 | int | |
73 | auth_password(Authctxt *authctxt, const char *password) | |
74 | { | |
75 | struct passwd * pw = authctxt->pw; | |
996d5e62 | 76 | int result, ok = authctxt->valid; |
c9f39d2c | 77 | #if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE) |
cdd66111 | 78 | static int expire_checked = 0; |
c9f39d2c | 79 | #endif |
3c0ef626 | 80 | |
3c0ef626 | 81 | #ifndef HAVE_CYGWIN |
cdd66111 | 82 | if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES) |
7e772e1f | 83 | ok = 0; |
3c0ef626 | 84 | #endif |
85 | if (*password == '\0' && options.permit_empty_passwd == 0) | |
7e772e1f | 86 | return 0; |
0fff78ff | 87 | |
cdd66111 | 88 | #ifdef KRB5 |
3c0ef626 | 89 | if (options.kerberos_authentication == 1) { |
90 | int ret = auth_krb5_password(authctxt, password); | |
91 | if (ret == 1 || ret == 0) | |
0fff78ff | 92 | return ret && ok; |
3c0ef626 | 93 | /* Fall back to ordinary passwd authentication. */ |
94 | } | |
cdd66111 | 95 | #endif |
96 | #ifdef HAVE_CYGWIN | |
3c0ef626 | 97 | if (is_winnt) { |
98 | HANDLE hToken = cygwin_logon_user(pw, password); | |
99 | ||
100 | if (hToken == INVALID_HANDLE_VALUE) | |
101 | return 0; | |
102 | cygwin_set_impersonation_token(hToken); | |
0fff78ff | 103 | return ok; |
3c0ef626 | 104 | } |
cdd66111 | 105 | #endif |
c9f39d2c | 106 | #ifdef USE_PAM |
107 | if (options.use_pam) | |
108 | return (sshpam_auth_passwd(authctxt, password) && ok); | |
109 | #endif | |
cdd66111 | 110 | #if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE) |
111 | if (!expire_checked) { | |
112 | expire_checked = 1; | |
996d5e62 | 113 | if (auth_shadow_pwexpired(authctxt)) |
cdd66111 | 114 | authctxt->force_pwchange = 1; |
cdd66111 | 115 | } |
116 | #endif | |
996d5e62 | 117 | result = sys_auth_passwd(authctxt, password); |
118 | if (authctxt->force_pwchange) | |
119 | disable_forwarding(); | |
120 | return (result && ok); | |
cdd66111 | 121 | } |
9cb1827b | 122 | |
cdd66111 | 123 | #ifdef BSD_AUTH |
996d5e62 | 124 | static void |
125 | warn_expiry(Authctxt *authctxt, auth_session_t *as) | |
126 | { | |
127 | char buf[256]; | |
128 | quad_t pwtimeleft, actimeleft, daysleft, pwwarntime, acwarntime; | |
129 | ||
130 | pwwarntime = acwarntime = TWO_WEEKS; | |
131 | ||
132 | pwtimeleft = auth_check_change(as); | |
133 | actimeleft = auth_check_expire(as); | |
134 | #ifdef HAVE_LOGIN_CAP | |
135 | if (authctxt->valid) { | |
136 | pwwarntime = login_getcaptime(lc, "password-warn", TWO_WEEKS, | |
137 | TWO_WEEKS); | |
138 | acwarntime = login_getcaptime(lc, "expire-warn", TWO_WEEKS, | |
139 | TWO_WEEKS); | |
140 | } | |
141 | #endif | |
142 | if (pwtimeleft != 0 && pwtimeleft < pwwarntime) { | |
143 | daysleft = pwtimeleft / DAY + 1; | |
144 | snprintf(buf, sizeof(buf), | |
145 | "Your password will expire in %lld day%s.\n", | |
146 | daysleft, daysleft == 1 ? "" : "s"); | |
147 | buffer_append(&loginmsg, buf, strlen(buf)); | |
148 | } | |
149 | if (actimeleft != 0 && actimeleft < acwarntime) { | |
150 | daysleft = actimeleft / DAY + 1; | |
151 | snprintf(buf, sizeof(buf), | |
152 | "Your account will expire in %lld day%s.\n", | |
153 | daysleft, daysleft == 1 ? "" : "s"); | |
154 | buffer_append(&loginmsg, buf, strlen(buf)); | |
155 | } | |
156 | } | |
157 | ||
cdd66111 | 158 | int |
159 | sys_auth_passwd(Authctxt *authctxt, const char *password) | |
160 | { | |
161 | struct passwd *pw = authctxt->pw; | |
162 | auth_session_t *as; | |
996d5e62 | 163 | static int expire_checked = 0; |
cdd66111 | 164 | |
165 | as = auth_usercheck(pw->pw_name, authctxt->style, "auth-ssh", | |
166 | (char *)password); | |
167 | if (auth_getstate(as) & AUTH_PWEXPIRED) { | |
168 | auth_close(as); | |
169 | disable_forwarding(); | |
170 | authctxt->force_pwchange = 1; | |
171 | return (1); | |
172 | } else { | |
996d5e62 | 173 | if (!expire_checked) { |
174 | expire_checked = 1; | |
175 | warn_expiry(authctxt, as); | |
176 | } | |
cdd66111 | 177 | return (auth_close(as)); |
9cb1827b | 178 | } |
cdd66111 | 179 | } |
180 | #elif !defined(CUSTOM_SYS_AUTH_PASSWD) | |
181 | int | |
182 | sys_auth_passwd(Authctxt *authctxt, const char *password) | |
183 | { | |
184 | struct passwd *pw = authctxt->pw; | |
185 | char *encrypted_password; | |
186 | ||
0fff78ff | 187 | /* Just use the supplied fake password if authctxt is invalid */ |
188 | char *pw_password = authctxt->valid ? shadow_pw(pw) : pw->pw_passwd; | |
3c0ef626 | 189 | |
190 | /* Check for users with no password. */ | |
acc3d05e | 191 | if (strcmp(pw_password, "") == 0 && strcmp(password, "") == 0) |
cdd66111 | 192 | return (1); |
0fff78ff | 193 | |
cdd66111 | 194 | /* Encrypt the candidate password using the proper salt. */ |
195 | encrypted_password = xcrypt(password, | |
196 | (pw_password[0] && pw_password[1]) ? pw_password : "xx"); | |
3c0ef626 | 197 | |
cdd66111 | 198 | /* |
199 | * Authentication is accepted if the encrypted passwords | |
200 | * are identical. | |
201 | */ | |
202 | return (strcmp(encrypted_password, pw_password) == 0); | |
700318f3 | 203 | } |
cdd66111 | 204 | #endif |