X-Git-Url: http://andersk.mit.edu/gitweb/openssh.git/blobdiff_plain/b9795b89111b12c0539a1e33a71ccdff4abc9fc2..HEAD:/auth-passwd.c diff --git a/auth-passwd.c b/auth-passwd.c index 1c7e983d..b1c6ce09 100644 --- a/auth-passwd.c +++ b/auth-passwd.c @@ -1,103 +1,214 @@ +/* $OpenBSD: auth-passwd.c,v 1.43 2007/09/21 08:15:29 djm Exp $ */ /* * Author: Tatu Ylonen * Copyright (c) 1995 Tatu Ylonen , Espoo, Finland * All rights reserved - * Created: Sat Mar 18 05:11:38 1995 ylo * Password authentication. This file contains the functions to check whether * the password is valid for the user. + * + * As far as I am concerned, the code I have written for this software + * can be used freely for any purpose. Any derived versions of this + * software must be clearly marked as such, and if the derived work is + * 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. + * Copyright (c) 2000 Markus Friedl. 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. */ #include "includes.h" -#ifndef USE_PAM +#include -RCSID("$Id$"); +#include +#include +#include +#include #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 HAVE_SHADOW_H -# include +extern Buffer loginmsg; +extern ServerOptions options; + +#ifdef HAVE_LOGIN_CAP +extern login_cap_t *lc; #endif -#if defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) -# include "md5crypt.h" -#endif /* defined(HAVE_MD5_PASSWORDS) && !defined(HAVE_MD5_CRYPT) */ + + +#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) +int +auth_password(Authctxt *authctxt, const char *password) { - extern ServerOptions options; - char *encrypted_password; - char *pw_password; - char *salt; -#ifdef HAVE_SHADOW_H - struct spwd *spw; + 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; - if (pw->pw_uid == 0 && options.permit_root_login == 2) - return 0; +#ifndef HAVE_CYGWIN + 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 SKEY - if (options.skey_authentication == 1) { - int ret = auth_skey_password(pw, password); +#ifdef KRB5 + if (options.kerberos_authentication == 1) { + int ret = auth_krb5_password(authctxt, password); if (ret == 1 || ret == 0) - return ret; + return ret && ok; /* Fall back to ordinary passwd authentication. */ } #endif -#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. */ +#ifdef HAVE_CYGWIN + { + HANDLE hToken = cygwin_logon_user(pw, password); + + if (hToken == INVALID_HANDLE_VALUE) + return 0; + cygwin_set_impersonation_token(hToken); + return ok; } #endif +#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); +} - /* Check for users with no password. */ - if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0) - return 1; +#ifdef BSD_AUTH +static void +warn_expiry(Authctxt *authctxt, auth_session_t *as) +{ + char buf[256]; + quad_t pwtimeleft, actimeleft, daysleft, pwwarntime, acwarntime; - pw_password = pw->pw_passwd; + pwwarntime = acwarntime = TWO_WEEKS; -#if defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) - spw = getspnam(pw->pw_name); - if (spw != NULL) - { - /* Check for users with no password. */ - if (strcmp(password, "") == 0 && strcmp(spw->sp_pwdp, "") == 0) - return 1; + 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)); + } +} + +int +sys_auth_passwd(Authctxt *authctxt, const char *password) +{ + struct passwd *pw = authctxt->pw; + auth_session_t *as; + static int expire_checked = 0; - pw_password = spw->sp_pwdp; + 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 /* defined(HAVE_SHADOW_H) && !defined(DISABLE_SHADOW) */ - - 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 */ - encrypted_password = crypt(password, salt); -#endif /* HAVE_MD5_PASSWORDS */ - - /* Authentication is accepted if the encrypted passwords are identical. */ +} +#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; + + /* 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"); + + /* + * Authentication is accepted if the encrypted passwords + * are identical. + */ return (strcmp(encrypted_password, pw_password) == 0); } -#endif /* !USE_PAM */ +#endif