Some notable changes, from upstream's release notes: - sshd(8): Remove support for obsolete "host/port" syntax. - ssh(1): When prompting whether to record a new host key, accept the key fingerprint as a synonym for "yes". - ssh-keygen(1): when acting as a CA and signing certificates with an RSA key, default to using the rsa-sha2-512 signature algorithm. - ssh(1), sshd(8), ssh-keygen(1): this release removes the "ssh-rsa" (RSA/SHA1) algorithm from those accepted for certificate signatures. - ssh-sk-helper(8): this is a new binary. It is used by the FIDO/U2F support to provide address-space isolation for token middleware libraries (including the internal one). - ssh(1): this release enables UpdateHostkeys by default subject to some conservative preconditions. - scp(1): this release changes the behaviour of remote to remote copies (e.g. "scp host-a:/path host-b:") to transfer through the local host by default. - scp(1): experimental support for transfers using the SFTP protocol as a replacement for the venerable SCP/RCP protocol that it has traditionally used. Additional integration work is needed to support FIDO/U2F in the base system. Deprecation Notice ------------------ OpenSSH will disable the ssh-rsa signature scheme by default in the next release. Reviewed by: imp MFC after: 1 month Relnotes: Yes Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D29985
174 lines
5.3 KiB
C
174 lines
5.3 KiB
C
/* $OpenBSD: sshlogin.c,v 1.35 2020/10/18 11:32:02 djm 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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* This file performs some of the things login(1) normally does. We cannot
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* easily use something like login -p -h host -f user, because there are
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* several different logins around, and it is hard to determined what kind of
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* login the current system has. Also, we want to be able to execute commands
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* on a tty.
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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 Theo de Raadt. All rights reserved.
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* Copyright (c) 1999 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 "includes.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <limits.h>
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#include "sshlogin.h"
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#include "ssherr.h"
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#include "loginrec.h"
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#include "log.h"
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#include "sshbuf.h"
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#include "misc.h"
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#include "servconf.h"
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extern struct sshbuf *loginmsg;
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extern ServerOptions options;
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/*
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* Returns the time when the user last logged in. Returns 0 if the
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* information is not available. This must be called before record_login.
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* The host the user logged in from will be returned in buf.
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*/
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time_t
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get_last_login_time(uid_t uid, const char *logname,
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char *buf, size_t bufsize)
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{
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struct logininfo li;
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login_get_lastlog(&li, uid);
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strlcpy(buf, li.hostname, bufsize);
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return (time_t)li.tv_sec;
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}
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/*
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* Generate and store last login message. This must be done before
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* login_login() is called and lastlog is updated.
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*/
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static void
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store_lastlog_message(const char *user, uid_t uid)
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{
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#ifndef NO_SSH_LASTLOG
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# ifndef CUSTOM_SYS_AUTH_GET_LASTLOGIN_MSG
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char hostname[HOST_NAME_MAX+1] = "";
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time_t last_login_time;
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# endif
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char *time_string;
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int r;
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if (!options.print_lastlog)
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return;
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# ifdef CUSTOM_SYS_AUTH_GET_LASTLOGIN_MSG
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time_string = sys_auth_get_lastlogin_msg(user, uid);
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if (time_string != NULL) {
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if ((r = sshbuf_put(loginmsg,
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time_string, strlen(time_string))) != 0)
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fatal("%s: buffer error: %s", __func__, ssh_err(r));
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free(time_string);
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}
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# else
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last_login_time = get_last_login_time(uid, user, hostname,
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sizeof(hostname));
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if (last_login_time != 0) {
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time_string = ctime(&last_login_time);
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time_string[strcspn(time_string, "\n")] = '\0';
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if (strcmp(hostname, "") == 0)
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r = sshbuf_putf(loginmsg, "Last login: %s\r\n",
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time_string);
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else
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r = sshbuf_putf(loginmsg, "Last login: %s from %s\r\n",
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time_string, hostname);
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if (r != 0)
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fatal_fr(r, "sshbuf_putf");
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}
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# endif /* CUSTOM_SYS_AUTH_GET_LASTLOGIN_MSG */
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#endif /* NO_SSH_LASTLOG */
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}
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/*
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* Records that the user has logged in. I wish these parts of operating
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* systems were more standardized.
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*/
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void
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record_login(pid_t pid, const char *tty, const char *user, uid_t uid,
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const char *host, struct sockaddr *addr, socklen_t addrlen)
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{
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struct logininfo *li;
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/* save previous login details before writing new */
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store_lastlog_message(user, uid);
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li = login_alloc_entry(pid, user, host, tty);
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login_set_addr(li, addr, addrlen);
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login_login(li);
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login_free_entry(li);
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}
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#ifdef LOGIN_NEEDS_UTMPX
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void
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record_utmp_only(pid_t pid, const char *ttyname, const char *user,
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const char *host, struct sockaddr *addr, socklen_t addrlen)
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{
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struct logininfo *li;
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li = login_alloc_entry(pid, user, host, ttyname);
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login_set_addr(li, addr, addrlen);
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login_utmp_only(li);
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login_free_entry(li);
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}
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#endif
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/* Records that the user has logged out. */
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void
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record_logout(pid_t pid, const char *tty, const char *user)
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{
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struct logininfo *li;
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li = login_alloc_entry(pid, user, NULL, tty);
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login_logout(li);
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login_free_entry(li);
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}
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