GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/ssh/sshd/../auth-passwd.c Lines: 0 41 0.0 %
Date: 2017-11-13 Branches: 0 22 0.0 %

Line Branch Exec Source
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/* $OpenBSD: auth-passwd.c,v 1.45 2016/07/21 01:39:35 dtucker Exp $ */
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/*
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 * Author: Tatu Ylonen <ylo@cs.hut.fi>
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 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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 *                    All rights reserved
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 * Password authentication.  This file contains the functions to check whether
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 * the password is valid for the user.
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 *
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 * As far as I am concerned, the code I have written for this software
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 * can be used freely for any purpose.  Any derived versions of this
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 * software must be clearly marked as such, and if the derived work is
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 * incompatible with the protocol description in the RFC file, it must be
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 * called by a name other than "ssh" or "Secure Shell".
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 *
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 * Copyright (c) 1999 Dug Song.  All rights reserved.
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 * Copyright (c) 2000 Markus Friedl.  All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <sys/types.h>
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#include <login_cap.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdarg.h>
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#include "packet.h"
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#include "buffer.h"
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#include "log.h"
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#include "misc.h"
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#include "servconf.h"
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#include "key.h"
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#include "hostfile.h"
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#include "auth.h"
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#include "auth-options.h"
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extern Buffer loginmsg;
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extern ServerOptions options;
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int sys_auth_passwd(Authctxt *, const char *);
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extern login_cap_t *lc;
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#define DAY		(24L * 60 * 60) /* 1 day in seconds */
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#define TWO_WEEKS	(2L * 7 * DAY)	/* 2 weeks in seconds */
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#define MAX_PASSWORD_LEN	1024
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static void
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disable_forwarding(void)
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{
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	no_port_forwarding_flag = 1;
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	no_agent_forwarding_flag = 1;
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	no_x11_forwarding_flag = 1;
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}
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/*
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 * Tries to authenticate the user using password.  Returns true if
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 * authentication succeeds.
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 */
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int
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auth_password(Authctxt *authctxt, const char *password)
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{
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	struct passwd * pw = authctxt->pw;
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	int ok = authctxt->valid;
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	if (strlen(password) > MAX_PASSWORD_LEN)
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		return 0;
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	if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
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		ok = 0;
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	if (*password == '\0' && options.permit_empty_passwd == 0)
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		return 0;
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#ifdef KRB5
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	if (options.kerberos_authentication == 1) {
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		int ret = auth_krb5_password(authctxt, password);
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		if (ret == 1 || ret == 0)
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			return ret && ok;
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		/* Fall back to ordinary passwd authentication. */
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	}
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#endif
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	return (sys_auth_passwd(authctxt, password) && ok);
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}
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static void
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warn_expiry(Authctxt *authctxt, auth_session_t *as)
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{
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	char buf[256];
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	quad_t pwtimeleft, actimeleft, daysleft, pwwarntime, acwarntime;
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	pwwarntime = acwarntime = TWO_WEEKS;
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	pwtimeleft = auth_check_change(as);
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	actimeleft = auth_check_expire(as);
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	if (authctxt->valid) {
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		pwwarntime = login_getcaptime(lc, "password-warn", TWO_WEEKS,
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		    TWO_WEEKS);
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		acwarntime = login_getcaptime(lc, "expire-warn", TWO_WEEKS,
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		    TWO_WEEKS);
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	}
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	if (pwtimeleft != 0 && pwtimeleft < pwwarntime) {
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		daysleft = pwtimeleft / DAY + 1;
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		snprintf(buf, sizeof(buf),
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		    "Your password will expire in %lld day%s.\n",
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		    daysleft, daysleft == 1 ? "" : "s");
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		buffer_append(&loginmsg, buf, strlen(buf));
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	}
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	if (actimeleft != 0 && actimeleft < acwarntime) {
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		daysleft = actimeleft / DAY + 1;
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		snprintf(buf, sizeof(buf),
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		    "Your account will expire in %lld day%s.\n",
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		    daysleft, daysleft == 1 ? "" : "s");
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		buffer_append(&loginmsg, buf, strlen(buf));
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	}
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}
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int
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sys_auth_passwd(Authctxt *authctxt, const char *password)
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{
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	struct passwd *pw = authctxt->pw;
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	auth_session_t *as;
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	static int expire_checked = 0;
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	as = auth_usercheck(pw->pw_name, authctxt->style, "auth-ssh",
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	    (char *)password);
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	if (as == NULL)
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		return (0);
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	if (auth_getstate(as) & AUTH_PWEXPIRED) {
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		auth_close(as);
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		disable_forwarding();
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		authctxt->force_pwchange = 1;
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		return (1);
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	} else {
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		if (!expire_checked) {
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			expire_checked = 1;
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			warn_expiry(authctxt, as);
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		}
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		return (auth_close(as));
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	}
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}