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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" | |
34fee935 | 39 | RCSID("$OpenBSD: auth-passwd.c,v 1.34 2005/07/19 15:32:26 otto Exp $"); |
3c0ef626 | 40 | |
41 | #include "packet.h" | |
34fee935 | 42 | #include "buffer.h" |
3c0ef626 | 43 | #include "log.h" |
44 | #include "servconf.h" | |
45 | #include "auth.h" | |
416fd2a8 | 46 | #include "auth-options.h" |
3c0ef626 | 47 | |
34fee935 | 48 | extern Buffer loginmsg; |
70791e56 | 49 | extern ServerOptions options; |
34fee935 | 50 | |
51 | #ifdef HAVE_LOGIN_CAP | |
52 | extern login_cap_t *lc; | |
53 | #endif | |
54 | ||
55 | ||
56 | #define DAY (24L * 60 * 60) /* 1 day in seconds */ | |
57 | #define TWO_WEEKS (2L * 7 * DAY) /* 2 weeks in seconds */ | |
416fd2a8 | 58 | |
59 | void | |
60 | disable_forwarding(void) | |
61 | { | |
62 | no_port_forwarding_flag = 1; | |
63 | no_agent_forwarding_flag = 1; | |
64 | no_x11_forwarding_flag = 1; | |
65 | } | |
70791e56 | 66 | |
3c0ef626 | 67 | /* |
68 | * Tries to authenticate the user using password. Returns true if | |
69 | * authentication succeeds. | |
70 | */ | |
71 | int | |
72 | auth_password(Authctxt *authctxt, const char *password) | |
73 | { | |
74 | struct passwd * pw = authctxt->pw; | |
34fee935 | 75 | int result, ok = authctxt->valid; |
1b56ff3d | 76 | #if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE) |
416fd2a8 | 77 | static int expire_checked = 0; |
1b56ff3d | 78 | #endif |
3c0ef626 | 79 | |
3c0ef626 | 80 | #ifndef HAVE_CYGWIN |
416fd2a8 | 81 | if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES) |
8bb69cbe | 82 | ok = 0; |
3c0ef626 | 83 | #endif |
84 | if (*password == '\0' && options.permit_empty_passwd == 0) | |
8bb69cbe | 85 | return 0; |
70791e56 | 86 | |
416fd2a8 | 87 | #ifdef KRB5 |
3c0ef626 | 88 | if (options.kerberos_authentication == 1) { |
89 | int ret = auth_krb5_password(authctxt, password); | |
90 | if (ret == 1 || ret == 0) | |
70791e56 | 91 | return ret && ok; |
3c0ef626 | 92 | /* Fall back to ordinary passwd authentication. */ |
93 | } | |
416fd2a8 | 94 | #endif |
95 | #ifdef HAVE_CYGWIN | |
3c0ef626 | 96 | if (is_winnt) { |
97 | HANDLE hToken = cygwin_logon_user(pw, password); | |
98 | ||
99 | if (hToken == INVALID_HANDLE_VALUE) | |
100 | return 0; | |
101 | cygwin_set_impersonation_token(hToken); | |
70791e56 | 102 | return ok; |
3c0ef626 | 103 | } |
416fd2a8 | 104 | #endif |
1b56ff3d | 105 | #ifdef USE_PAM |
106 | if (options.use_pam) | |
107 | return (sshpam_auth_passwd(authctxt, password) && ok); | |
108 | #endif | |
416fd2a8 | 109 | #if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE) |
110 | if (!expire_checked) { | |
111 | expire_checked = 1; | |
34fee935 | 112 | if (auth_shadow_pwexpired(authctxt)) |
416fd2a8 | 113 | authctxt->force_pwchange = 1; |
416fd2a8 | 114 | } |
115 | #endif | |
34fee935 | 116 | result = sys_auth_passwd(authctxt, password); |
117 | if (authctxt->force_pwchange) | |
118 | disable_forwarding(); | |
119 | return (result && ok); | |
416fd2a8 | 120 | } |
70791e56 | 121 | |
416fd2a8 | 122 | #ifdef BSD_AUTH |
34fee935 | 123 | static void |
124 | warn_expiry(Authctxt *authctxt, auth_session_t *as) | |
125 | { | |
126 | char buf[256]; | |
127 | quad_t pwtimeleft, actimeleft, daysleft, pwwarntime, acwarntime; | |
128 | ||
129 | pwwarntime = acwarntime = TWO_WEEKS; | |
130 | ||
131 | pwtimeleft = auth_check_change(as); | |
132 | actimeleft = auth_check_expire(as); | |
133 | #ifdef HAVE_LOGIN_CAP | |
134 | if (authctxt->valid) { | |
135 | pwwarntime = login_getcaptime(lc, "password-warn", TWO_WEEKS, | |
136 | TWO_WEEKS); | |
137 | acwarntime = login_getcaptime(lc, "expire-warn", TWO_WEEKS, | |
138 | TWO_WEEKS); | |
139 | } | |
140 | #endif | |
141 | if (pwtimeleft != 0 && pwtimeleft < pwwarntime) { | |
142 | daysleft = pwtimeleft / DAY + 1; | |
143 | snprintf(buf, sizeof(buf), | |
144 | "Your password will expire in %lld day%s.\n", | |
145 | daysleft, daysleft == 1 ? "" : "s"); | |
146 | buffer_append(&loginmsg, buf, strlen(buf)); | |
147 | } | |
148 | if (actimeleft != 0 && actimeleft < acwarntime) { | |
149 | daysleft = actimeleft / DAY + 1; | |
150 | snprintf(buf, sizeof(buf), | |
151 | "Your account will expire in %lld day%s.\n", | |
152 | daysleft, daysleft == 1 ? "" : "s"); | |
153 | buffer_append(&loginmsg, buf, strlen(buf)); | |
154 | } | |
155 | } | |
156 | ||
416fd2a8 | 157 | int |
158 | sys_auth_passwd(Authctxt *authctxt, const char *password) | |
159 | { | |
160 | struct passwd *pw = authctxt->pw; | |
161 | auth_session_t *as; | |
34fee935 | 162 | static int expire_checked = 0; |
416fd2a8 | 163 | |
164 | as = auth_usercheck(pw->pw_name, authctxt->style, "auth-ssh", | |
165 | (char *)password); | |
34fee935 | 166 | if (as == NULL) |
167 | return (0); | |
416fd2a8 | 168 | if (auth_getstate(as) & AUTH_PWEXPIRED) { |
169 | auth_close(as); | |
170 | disable_forwarding(); | |
171 | authctxt->force_pwchange = 1; | |
172 | return (1); | |
173 | } else { | |
34fee935 | 174 | if (!expire_checked) { |
175 | expire_checked = 1; | |
176 | warn_expiry(authctxt, as); | |
177 | } | |
416fd2a8 | 178 | return (auth_close(as)); |
3c0ef626 | 179 | } |
416fd2a8 | 180 | } |
181 | #elif !defined(CUSTOM_SYS_AUTH_PASSWD) | |
182 | int | |
183 | sys_auth_passwd(Authctxt *authctxt, const char *password) | |
184 | { | |
185 | struct passwd *pw = authctxt->pw; | |
186 | char *encrypted_password; | |
187 | ||
70791e56 | 188 | /* Just use the supplied fake password if authctxt is invalid */ |
189 | char *pw_password = authctxt->valid ? shadow_pw(pw) : pw->pw_passwd; | |
3c0ef626 | 190 | |
191 | /* Check for users with no password. */ | |
70791e56 | 192 | if (strcmp(pw_password, "") == 0 && strcmp(password, "") == 0) |
416fd2a8 | 193 | return (1); |
70791e56 | 194 | |
416fd2a8 | 195 | /* Encrypt the candidate password using the proper salt. */ |
196 | encrypted_password = xcrypt(password, | |
197 | (pw_password[0] && pw_password[1]) ? pw_password : "xx"); | |
3c0ef626 | 198 | |
416fd2a8 | 199 | /* |
200 | * Authentication is accepted if the encrypted passwords | |
201 | * are identical. | |
202 | */ | |
203 | return (strcmp(encrypted_password, pw_password) == 0); | |
2980ea68 | 204 | } |
416fd2a8 | 205 | #endif |