+/* $OpenBSD: auth-passwd.c,v 1.43 2007/09/21 08:15:29 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* incompatible with the protocol description in the RFC file, it must be
* called by a name other than "ssh" or "Secure Shell".
*
- *
* Copyright (c) 1999 Dug Song. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- *
* Copyright (c) 2000 Markus Friedl. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
*/
#include "includes.h"
-RCSID("$OpenBSD: auth-passwd.c,v 1.17 2000/09/07 20:27:49 deraadt Exp $");
-#if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
+#include <sys/types.h>
+
+#include <pwd.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
#include "packet.h"
-#include "ssh.h"
+#include "buffer.h"
+#include "log.h"
#include "servconf.h"
-#include "xmalloc.h"
+#include "key.h"
+#include "hostfile.h"
+#include "auth.h"
+#include "auth-options.h"
-#ifdef WITH_AIXAUTHENTICATE
-# include <login.h>
-#endif
-#ifdef __hpux
-# include <hpsecurity.h>
-# include <prot.h>
-#endif
-#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
-# include <shadow.h>
-#endif
-#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
-# include <sys/label.h>
-# include <sys/audit.h>
-# include <pwdadj.h>
-#endif
-#if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT)
-# include "md5crypt.h"
-#endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */
+extern Buffer loginmsg;
+extern ServerOptions options;
-#ifdef HAVE_CYGWIN
-#undef ERROR
-#include <windows.h>
-#include <sys/cygwin.h>
-#define is_winnt (GetVersion() < 0x80000000)
+#ifdef HAVE_LOGIN_CAP
+extern login_cap_t *lc;
#endif
+
+#define DAY (24L * 60 * 60) /* 1 day in seconds */
+#define TWO_WEEKS (2L * 7 * DAY) /* 2 weeks in seconds */
+
+void
+disable_forwarding(void)
+{
+ no_port_forwarding_flag = 1;
+ no_agent_forwarding_flag = 1;
+ no_x11_forwarding_flag = 1;
+}
+
/*
* Tries to authenticate the user using password. Returns true if
* authentication succeeds.
*/
int
-auth_password(struct passwd * pw, const char *password)
+auth_password(Authctxt *authctxt, const char *password)
{
- extern ServerOptions options;
- char *encrypted_password;
- char *pw_password;
- char *salt;
-#ifdef __hpux
- struct pr_passwd *spw;
-#endif
-#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
- struct spwd *spw;
-#endif
-#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
- struct passwd_adjunct *spw;
-#endif
-#ifdef WITH_AIXAUTHENTICATE
- char *authmsg;
- char *loginmsg;
- int reenter = 1;
+ struct passwd * pw = authctxt->pw;
+ int result, ok = authctxt->valid;
+#if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE)
+ static int expire_checked = 0;
#endif
- /* deny if no user. */
- if (pw == NULL)
- return 0;
#ifndef HAVE_CYGWIN
- if (pw->pw_uid == 0 && options.permit_root_login == 2)
- return 0;
-#endif
-#ifdef HAVE_CYGWIN
- /*
- * Empty password is only possible on NT if the user has _really_
- * an empty password and authentication is done, though.
- */
- if (!is_winnt)
+ if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
+ ok = 0;
#endif
if (*password == '\0' && options.permit_empty_passwd == 0)
return 0;
+#ifdef KRB5
+ if (options.kerberos_authentication == 1) {
+ int ret = auth_krb5_password(authctxt, password);
+ if (ret == 1 || ret == 0)
+ return ret && ok;
+ /* Fall back to ordinary passwd authentication. */
+ }
+#endif
#ifdef HAVE_CYGWIN
- if (is_winnt) {
+ {
HANDLE hToken = cygwin_logon_user(pw, password);
if (hToken == INVALID_HANDLE_VALUE)
return 0;
cygwin_set_impersonation_token(hToken);
- return 1;
+ return ok;
}
#endif
-
-#ifdef SKEY
- if (options.skey_authentication == 1) {
- int ret = auth_skey_password(pw, password);
- if (ret == 1 || ret == 0)
- return ret;
- /* Fall back to ordinary passwd authentication. */
+#ifdef USE_PAM
+ if (options.use_pam)
+ return (sshpam_auth_passwd(authctxt, password) && ok);
+#endif
+#if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE)
+ if (!expire_checked) {
+ expire_checked = 1;
+ if (auth_shadow_pwexpired(authctxt))
+ authctxt->force_pwchange = 1;
}
#endif
+ result = sys_auth_passwd(authctxt, password);
+ if (authctxt->force_pwchange)
+ disable_forwarding();
+ return (result && ok);
+}
-#ifdef WITH_AIXAUTHENTICATE
- return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
+#ifdef BSD_AUTH
+static void
+warn_expiry(Authctxt *authctxt, auth_session_t *as)
+{
+ char buf[256];
+ quad_t pwtimeleft, actimeleft, daysleft, pwwarntime, acwarntime;
+
+ pwwarntime = acwarntime = TWO_WEEKS;
+
+ pwtimeleft = auth_check_change(as);
+ actimeleft = auth_check_expire(as);
+#ifdef HAVE_LOGIN_CAP
+ if (authctxt->valid) {
+ pwwarntime = login_getcaptime(lc, "password-warn", TWO_WEEKS,
+ TWO_WEEKS);
+ acwarntime = login_getcaptime(lc, "expire-warn", TWO_WEEKS,
+ TWO_WEEKS);
+ }
#endif
+ if (pwtimeleft != 0 && pwtimeleft < pwwarntime) {
+ daysleft = pwtimeleft / DAY + 1;
+ snprintf(buf, sizeof(buf),
+ "Your password will expire in %lld day%s.\n",
+ daysleft, daysleft == 1 ? "" : "s");
+ buffer_append(&loginmsg, buf, strlen(buf));
+ }
+ if (actimeleft != 0 && actimeleft < acwarntime) {
+ daysleft = actimeleft / DAY + 1;
+ snprintf(buf, sizeof(buf),
+ "Your account will expire in %lld day%s.\n",
+ daysleft, daysleft == 1 ? "" : "s");
+ buffer_append(&loginmsg, buf, strlen(buf));
+ }
+}
-#ifdef KRB4
- if (options.kerberos_authentication == 1) {
- int ret = auth_krb4_password(pw, password);
- if (ret == 1 || ret == 0)
- return ret;
- /* Fall back to ordinary passwd authentication. */
+int
+sys_auth_passwd(Authctxt *authctxt, const char *password)
+{
+ struct passwd *pw = authctxt->pw;
+ auth_session_t *as;
+ static int expire_checked = 0;
+
+ as = auth_usercheck(pw->pw_name, authctxt->style, "auth-ssh",
+ (char *)password);
+ if (as == NULL)
+ return (0);
+ if (auth_getstate(as) & AUTH_PWEXPIRED) {
+ auth_close(as);
+ disable_forwarding();
+ authctxt->force_pwchange = 1;
+ return (1);
+ } else {
+ if (!expire_checked) {
+ expire_checked = 1;
+ warn_expiry(authctxt, as);
+ }
+ return (auth_close(as));
}
-#endif
+}
+#elif !defined(CUSTOM_SYS_AUTH_PASSWD)
+int
+sys_auth_passwd(Authctxt *authctxt, const char *password)
+{
+ struct passwd *pw = authctxt->pw;
+ char *encrypted_password;
+ /* Just use the supplied fake password if authctxt is invalid */
+ char *pw_password = authctxt->valid ? shadow_pw(pw) : pw->pw_passwd;
- pw_password = pw->pw_passwd;
+ /* Check for users with no password. */
+ if (strcmp(pw_password, "") == 0 && strcmp(password, "") == 0)
+ return (1);
+
+ /* Encrypt the candidate password using the proper salt. */
+ encrypted_password = xcrypt(password,
+ (pw_password[0] && pw_password[1]) ? pw_password : "xx");
/*
- * Various interfaces to shadow or protected password data
+ * Authentication is accepted if the encrypted passwords
+ * are identical.
*/
-#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW)
- spw = getspnam(pw->pw_name);
- if (spw != NULL)
- pw_password = spw->sp_pwdp;
-#endif /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */
-#if defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW)
- if (issecure() && (spw = getpwanam(pw->pw_name)) != NULL)
- pw_password = spw->pwa_passwd;
-#endif /* defined(HAVE_GETPWANAM) && !defined(DISABLE_SHADOW) */
-#if defined(__hpux)
- if (iscomsec() && (spw = getprpwnam(pw->pw_name)) != NULL)
- pw_password = spw->ufld.fd_encrypt;
-#endif /* defined(__hpux) */
-
- /* Check for users with no password. */
- if ((password[0] == '\0') && (pw_password[0] == '\0'))
- return 1;
-
- if (pw_password[0] != '\0')
- salt = pw_password;
- else
- salt = "xx";
-
-#ifdef HAVE_MD5_PASSWORDS
- if (is_md5_salt(salt))
- encrypted_password = md5_crypt(password, salt);
- else
- encrypted_password = crypt(password, salt);
-#else /* HAVE_MD5_PASSWORDS */
-# ifdef __hpux
- if (iscomsec())
- encrypted_password = bigcrypt(password, salt);
- else
- encrypted_password = crypt(password, salt);
-# else
- encrypted_password = crypt(password, salt);
-# endif /* __hpux */
-#endif /* HAVE_MD5_PASSWORDS */
-
- /* Authentication is accepted if the encrypted passwords are identical. */
return (strcmp(encrypted_password, pw_password) == 0);
}
-#endif /* !USE_PAM && !HAVE_OSF_SIA */
+#endif
andersk / openssh.git / blobdiff