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a9d2c89fc5
[channels.c channels.h session.c session.h] display, screen, row, col, xpixel, ypixel are u_int; markus ok - (bal) Also fixed IPADDR_IN_DISPLAY case where display, screen, row, col, xpixel are u_int.
2025 lines
50 KiB
C
2025 lines
50 KiB
C
/*
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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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*
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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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* SSH2 support by Markus Friedl.
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* Copyright (c) 2000, 2001 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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RCSID("$OpenBSD: session.c,v 1.140 2002/06/23 21:06:41 deraadt Exp $");
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#include "ssh.h"
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#include "ssh1.h"
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#include "ssh2.h"
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#include "xmalloc.h"
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#include "sshpty.h"
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#include "packet.h"
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#include "buffer.h"
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#include "mpaux.h"
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#include "uidswap.h"
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#include "compat.h"
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#include "channels.h"
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#include "bufaux.h"
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#include "auth.h"
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#include "auth-options.h"
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#include "pathnames.h"
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#include "log.h"
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#include "servconf.h"
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#include "sshlogin.h"
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#include "serverloop.h"
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#include "canohost.h"
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#include "session.h"
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#include "monitor_wrap.h"
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#ifdef HAVE_CYGWIN
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#include <windows.h>
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#include <sys/cygwin.h>
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#define is_winnt (GetVersion() < 0x80000000)
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#endif
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/* func */
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Session *session_new(void);
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void session_set_fds(Session *, int, int, int);
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void session_pty_cleanup(void *);
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void session_proctitle(Session *);
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int session_setup_x11fwd(Session *);
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void do_exec_pty(Session *, const char *);
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void do_exec_no_pty(Session *, const char *);
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void do_exec(Session *, const char *);
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void do_login(Session *, const char *);
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#ifdef LOGIN_NEEDS_UTMPX
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static void do_pre_login(Session *s);
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#endif
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void do_child(Session *, const char *);
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void do_motd(void);
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int check_quietlogin(Session *, const char *);
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static void do_authenticated1(Authctxt *);
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static void do_authenticated2(Authctxt *);
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static int session_pty_req(Session *);
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/* import */
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extern ServerOptions options;
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extern char *__progname;
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extern int log_stderr;
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extern int debug_flag;
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extern u_int utmp_len;
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extern int startup_pipe;
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extern void destroy_sensitive_data(void);
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/* original command from peer. */
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const char *original_command = NULL;
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/* data */
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#define MAX_SESSIONS 10
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Session sessions[MAX_SESSIONS];
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#ifdef WITH_AIXAUTHENTICATE
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char *aixloginmsg;
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#endif /* WITH_AIXAUTHENTICATE */
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#ifdef HAVE_LOGIN_CAP
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login_cap_t *lc;
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#endif
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/* Name and directory of socket for authentication agent forwarding. */
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static char *auth_sock_name = NULL;
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static char *auth_sock_dir = NULL;
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/* removes the agent forwarding socket */
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static void
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auth_sock_cleanup_proc(void *_pw)
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{
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struct passwd *pw = _pw;
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if (auth_sock_name != NULL) {
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temporarily_use_uid(pw);
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unlink(auth_sock_name);
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rmdir(auth_sock_dir);
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auth_sock_name = NULL;
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restore_uid();
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}
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}
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static int
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auth_input_request_forwarding(struct passwd * pw)
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{
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Channel *nc;
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int sock;
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struct sockaddr_un sunaddr;
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if (auth_sock_name != NULL) {
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error("authentication forwarding requested twice.");
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return 0;
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}
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/* Temporarily drop privileged uid for mkdir/bind. */
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temporarily_use_uid(pw);
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/* Allocate a buffer for the socket name, and format the name. */
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auth_sock_name = xmalloc(MAXPATHLEN);
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auth_sock_dir = xmalloc(MAXPATHLEN);
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strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
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/* Create private directory for socket */
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if (mkdtemp(auth_sock_dir) == NULL) {
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packet_send_debug("Agent forwarding disabled: "
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"mkdtemp() failed: %.100s", strerror(errno));
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restore_uid();
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xfree(auth_sock_name);
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xfree(auth_sock_dir);
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auth_sock_name = NULL;
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auth_sock_dir = NULL;
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return 0;
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}
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snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld",
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auth_sock_dir, (long) getpid());
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/* delete agent socket on fatal() */
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fatal_add_cleanup(auth_sock_cleanup_proc, pw);
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/* Create the socket. */
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sock = socket(AF_UNIX, SOCK_STREAM, 0);
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if (sock < 0)
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packet_disconnect("socket: %.100s", strerror(errno));
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/* Bind it to the name. */
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memset(&sunaddr, 0, sizeof(sunaddr));
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sunaddr.sun_family = AF_UNIX;
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strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path));
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if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0)
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packet_disconnect("bind: %.100s", strerror(errno));
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/* Restore the privileged uid. */
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restore_uid();
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/* Start listening on the socket. */
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if (listen(sock, 5) < 0)
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packet_disconnect("listen: %.100s", strerror(errno));
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/* Allocate a channel for the authentication agent socket. */
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nc = channel_new("auth socket",
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SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
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CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
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0, xstrdup("auth socket"), 1);
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strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
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return 1;
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}
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void
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do_authenticated(Authctxt *authctxt)
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{
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/*
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* Cancel the alarm we set to limit the time taken for
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* authentication.
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*/
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alarm(0);
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if (startup_pipe != -1) {
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close(startup_pipe);
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startup_pipe = -1;
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}
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#ifdef WITH_AIXAUTHENTICATE
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/* We don't have a pty yet, so just label the line as "ssh" */
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if (loginsuccess(authctxt->user,
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get_canonical_hostname(options.verify_reverse_mapping),
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"ssh", &aixloginmsg) < 0)
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aixloginmsg = NULL;
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#endif /* WITH_AIXAUTHENTICATE */
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/* setup the channel layer */
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if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
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channel_permit_all_opens();
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if (compat20)
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do_authenticated2(authctxt);
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else
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do_authenticated1(authctxt);
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/* remove agent socket */
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if (auth_sock_name != NULL)
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auth_sock_cleanup_proc(authctxt->pw);
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#ifdef KRB4
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if (options.kerberos_ticket_cleanup)
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krb4_cleanup_proc(authctxt);
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#endif
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#ifdef KRB5
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if (options.kerberos_ticket_cleanup)
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krb5_cleanup_proc(authctxt);
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#endif
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}
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/*
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* Prepares for an interactive session. This is called after the user has
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* been successfully authenticated. During this message exchange, pseudo
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* terminals are allocated, X11, TCP/IP, and authentication agent forwardings
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* are requested, etc.
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*/
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static void
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do_authenticated1(Authctxt *authctxt)
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{
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Session *s;
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char *command;
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int success, type, screen_flag;
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int enable_compression_after_reply = 0;
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u_int proto_len, data_len, dlen, compression_level = 0;
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s = session_new();
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s->authctxt = authctxt;
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s->pw = authctxt->pw;
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/*
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* We stay in this loop until the client requests to execute a shell
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* or a command.
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*/
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for (;;) {
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success = 0;
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/* Get a packet from the client. */
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type = packet_read();
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/* Process the packet. */
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switch (type) {
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case SSH_CMSG_REQUEST_COMPRESSION:
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compression_level = packet_get_int();
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packet_check_eom();
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if (compression_level < 1 || compression_level > 9) {
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packet_send_debug("Received illegal compression level %d.",
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compression_level);
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break;
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}
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if (!options.compression) {
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debug2("compression disabled");
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break;
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}
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/* Enable compression after we have responded with SUCCESS. */
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enable_compression_after_reply = 1;
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success = 1;
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break;
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case SSH_CMSG_REQUEST_PTY:
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success = session_pty_req(s);
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break;
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case SSH_CMSG_X11_REQUEST_FORWARDING:
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s->auth_proto = packet_get_string(&proto_len);
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s->auth_data = packet_get_string(&data_len);
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screen_flag = packet_get_protocol_flags() &
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SSH_PROTOFLAG_SCREEN_NUMBER;
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debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag);
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if (packet_remaining() == 4) {
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if (!screen_flag)
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debug2("Buggy client: "
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"X11 screen flag missing");
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s->screen = packet_get_int();
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} else {
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s->screen = 0;
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}
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packet_check_eom();
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success = session_setup_x11fwd(s);
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if (!success) {
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xfree(s->auth_proto);
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xfree(s->auth_data);
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s->auth_proto = NULL;
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s->auth_data = NULL;
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}
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break;
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case SSH_CMSG_AGENT_REQUEST_FORWARDING:
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if (no_agent_forwarding_flag || compat13) {
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debug("Authentication agent forwarding not permitted for this authentication.");
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break;
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}
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debug("Received authentication agent forwarding request.");
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success = auth_input_request_forwarding(s->pw);
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break;
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case SSH_CMSG_PORT_FORWARD_REQUEST:
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if (no_port_forwarding_flag) {
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debug("Port forwarding not permitted for this authentication.");
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break;
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}
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if (!options.allow_tcp_forwarding) {
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debug("Port forwarding not permitted.");
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break;
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}
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debug("Received TCP/IP port forwarding request.");
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channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
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success = 1;
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break;
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case SSH_CMSG_MAX_PACKET_SIZE:
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if (packet_set_maxsize(packet_get_int()) > 0)
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success = 1;
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break;
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#if defined(AFS) || defined(KRB5)
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case SSH_CMSG_HAVE_KERBEROS_TGT:
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if (!options.kerberos_tgt_passing) {
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verbose("Kerberos TGT passing disabled.");
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} else {
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char *kdata = packet_get_string(&dlen);
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packet_check_eom();
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/* XXX - 0x41, see creds_to_radix version */
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if (kdata[0] != 0x41) {
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#ifdef KRB5
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krb5_data tgt;
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tgt.data = kdata;
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tgt.length = dlen;
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if (auth_krb5_tgt(s->authctxt, &tgt))
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success = 1;
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else
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verbose("Kerberos v5 TGT refused for %.100s", s->authctxt->user);
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#endif /* KRB5 */
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} else {
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#ifdef AFS
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if (auth_krb4_tgt(s->authctxt, kdata))
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success = 1;
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else
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verbose("Kerberos v4 TGT refused for %.100s", s->authctxt->user);
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#endif /* AFS */
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}
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xfree(kdata);
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}
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break;
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#endif /* AFS || KRB5 */
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#ifdef AFS
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case SSH_CMSG_HAVE_AFS_TOKEN:
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if (!options.afs_token_passing || !k_hasafs()) {
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verbose("AFS token passing disabled.");
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} else {
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/* Accept AFS token. */
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char *token = packet_get_string(&dlen);
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packet_check_eom();
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if (auth_afs_token(s->authctxt, token))
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success = 1;
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else
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verbose("AFS token refused for %.100s",
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s->authctxt->user);
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xfree(token);
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}
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break;
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#endif /* AFS */
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case SSH_CMSG_EXEC_SHELL:
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case SSH_CMSG_EXEC_CMD:
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if (type == SSH_CMSG_EXEC_CMD) {
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command = packet_get_string(&dlen);
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debug("Exec command '%.500s'", command);
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do_exec(s, command);
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xfree(command);
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} else {
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do_exec(s, NULL);
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}
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packet_check_eom();
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session_close(s);
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return;
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default:
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/*
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* Any unknown messages in this phase are ignored,
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* and a failure message is returned.
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*/
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log("Unknown packet type received after authentication: %d", type);
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}
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packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
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packet_send();
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packet_write_wait();
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/* Enable compression now that we have replied if appropriate. */
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if (enable_compression_after_reply) {
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enable_compression_after_reply = 0;
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packet_start_compression(compression_level);
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}
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}
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}
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/*
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* This is called to fork and execute a command when we have no tty. This
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* will call do_child from the child, and server_loop from the parent after
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* setting up file descriptors and such.
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*/
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void
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do_exec_no_pty(Session *s, const char *command)
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{
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pid_t pid;
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#ifdef USE_PIPES
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int pin[2], pout[2], perr[2];
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/* Allocate pipes for communicating with the program. */
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if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
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packet_disconnect("Could not create pipes: %.100s",
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strerror(errno));
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#else /* USE_PIPES */
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int inout[2], err[2];
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/* Uses socket pairs to communicate with the program. */
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
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socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
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packet_disconnect("Could not create socket pairs: %.100s",
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strerror(errno));
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#endif /* USE_PIPES */
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if (s == NULL)
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fatal("do_exec_no_pty: no session");
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session_proctitle(s);
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#if defined(USE_PAM)
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do_pam_session(s->pw->pw_name, NULL);
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do_pam_setcred(1);
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if (is_pam_password_change_required())
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packet_disconnect("Password change required but no "
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"TTY available");
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#endif /* USE_PAM */
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|
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/* Fork the child. */
|
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if ((pid = fork()) == 0) {
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/* Child. Reinitialize the log since the pid has changed. */
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log_init(__progname, options.log_level, options.log_facility, log_stderr);
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|
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/*
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* Create a new session and process group since the 4.4BSD
|
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* setlogin() affects the entire process group.
|
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*/
|
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if (setsid() < 0)
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error("setsid failed: %.100s", strerror(errno));
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|
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#ifdef USE_PIPES
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/*
|
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* Redirect stdin. We close the parent side of the socket
|
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* pair, and make the child side the standard input.
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*/
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close(pin[1]);
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if (dup2(pin[0], 0) < 0)
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perror("dup2 stdin");
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close(pin[0]);
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/* Redirect stdout. */
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close(pout[0]);
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if (dup2(pout[1], 1) < 0)
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perror("dup2 stdout");
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close(pout[1]);
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/* Redirect stderr. */
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close(perr[0]);
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if (dup2(perr[1], 2) < 0)
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perror("dup2 stderr");
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close(perr[1]);
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#else /* USE_PIPES */
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/*
|
|
* Redirect stdin, stdout, and stderr. Stdin and stdout will
|
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* use the same socket, as some programs (particularly rdist)
|
|
* seem to depend on it.
|
|
*/
|
|
close(inout[1]);
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close(err[1]);
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if (dup2(inout[0], 0) < 0) /* stdin */
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perror("dup2 stdin");
|
|
if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
|
|
perror("dup2 stdout");
|
|
if (dup2(err[0], 2) < 0) /* stderr */
|
|
perror("dup2 stderr");
|
|
#endif /* USE_PIPES */
|
|
|
|
/* Do processing for the child (exec command etc). */
|
|
do_child(s, command);
|
|
/* NOTREACHED */
|
|
}
|
|
#ifdef HAVE_CYGWIN
|
|
if (is_winnt)
|
|
cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
|
|
#endif
|
|
if (pid < 0)
|
|
packet_disconnect("fork failed: %.100s", strerror(errno));
|
|
s->pid = pid;
|
|
/* Set interactive/non-interactive mode. */
|
|
packet_set_interactive(s->display != NULL);
|
|
#ifdef USE_PIPES
|
|
/* We are the parent. Close the child sides of the pipes. */
|
|
close(pin[0]);
|
|
close(pout[1]);
|
|
close(perr[1]);
|
|
|
|
if (compat20) {
|
|
session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]);
|
|
} else {
|
|
/* Enter the interactive session. */
|
|
server_loop(pid, pin[1], pout[0], perr[0]);
|
|
/* server_loop has closed pin[1], pout[0], and perr[0]. */
|
|
}
|
|
#else /* USE_PIPES */
|
|
/* We are the parent. Close the child sides of the socket pairs. */
|
|
close(inout[0]);
|
|
close(err[0]);
|
|
|
|
/*
|
|
* Enter the interactive session. Note: server_loop must be able to
|
|
* handle the case that fdin and fdout are the same.
|
|
*/
|
|
if (compat20) {
|
|
session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
|
|
} else {
|
|
server_loop(pid, inout[1], inout[1], err[1]);
|
|
/* server_loop has closed inout[1] and err[1]. */
|
|
}
|
|
#endif /* USE_PIPES */
|
|
}
|
|
|
|
/*
|
|
* This is called to fork and execute a command when we have a tty. This
|
|
* will call do_child from the child, and server_loop from the parent after
|
|
* setting up file descriptors, controlling tty, updating wtmp, utmp,
|
|
* lastlog, and other such operations.
|
|
*/
|
|
void
|
|
do_exec_pty(Session *s, const char *command)
|
|
{
|
|
int fdout, ptyfd, ttyfd, ptymaster;
|
|
pid_t pid;
|
|
|
|
if (s == NULL)
|
|
fatal("do_exec_pty: no session");
|
|
ptyfd = s->ptyfd;
|
|
ttyfd = s->ttyfd;
|
|
|
|
#if defined(USE_PAM)
|
|
do_pam_session(s->pw->pw_name, s->tty);
|
|
do_pam_setcred(1);
|
|
#endif
|
|
|
|
/* Fork the child. */
|
|
if ((pid = fork()) == 0) {
|
|
|
|
/* Child. Reinitialize the log because the pid has changed. */
|
|
log_init(__progname, options.log_level, options.log_facility, log_stderr);
|
|
/* Close the master side of the pseudo tty. */
|
|
close(ptyfd);
|
|
|
|
/* Make the pseudo tty our controlling tty. */
|
|
pty_make_controlling_tty(&ttyfd, s->tty);
|
|
|
|
/* Redirect stdin/stdout/stderr from the pseudo tty. */
|
|
if (dup2(ttyfd, 0) < 0)
|
|
error("dup2 stdin: %s", strerror(errno));
|
|
if (dup2(ttyfd, 1) < 0)
|
|
error("dup2 stdout: %s", strerror(errno));
|
|
if (dup2(ttyfd, 2) < 0)
|
|
error("dup2 stderr: %s", strerror(errno));
|
|
|
|
/* Close the extra descriptor for the pseudo tty. */
|
|
close(ttyfd);
|
|
|
|
/* record login, etc. similar to login(1) */
|
|
#ifndef HAVE_OSF_SIA
|
|
if (!(options.use_login && command == NULL))
|
|
do_login(s, command);
|
|
# ifdef LOGIN_NEEDS_UTMPX
|
|
else
|
|
do_pre_login(s);
|
|
# endif
|
|
#endif
|
|
|
|
/* Do common processing for the child, such as execing the command. */
|
|
do_child(s, command);
|
|
/* NOTREACHED */
|
|
}
|
|
#ifdef HAVE_CYGWIN
|
|
if (is_winnt)
|
|
cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
|
|
#endif
|
|
if (pid < 0)
|
|
packet_disconnect("fork failed: %.100s", strerror(errno));
|
|
s->pid = pid;
|
|
|
|
/* Parent. Close the slave side of the pseudo tty. */
|
|
close(ttyfd);
|
|
|
|
/*
|
|
* Create another descriptor of the pty master side for use as the
|
|
* standard input. We could use the original descriptor, but this
|
|
* simplifies code in server_loop. The descriptor is bidirectional.
|
|
*/
|
|
fdout = dup(ptyfd);
|
|
if (fdout < 0)
|
|
packet_disconnect("dup #1 failed: %.100s", strerror(errno));
|
|
|
|
/* we keep a reference to the pty master */
|
|
ptymaster = dup(ptyfd);
|
|
if (ptymaster < 0)
|
|
packet_disconnect("dup #2 failed: %.100s", strerror(errno));
|
|
s->ptymaster = ptymaster;
|
|
|
|
/* Enter interactive session. */
|
|
packet_set_interactive(1);
|
|
if (compat20) {
|
|
session_set_fds(s, ptyfd, fdout, -1);
|
|
} else {
|
|
server_loop(pid, ptyfd, fdout, -1);
|
|
/* server_loop _has_ closed ptyfd and fdout. */
|
|
}
|
|
}
|
|
|
|
#ifdef LOGIN_NEEDS_UTMPX
|
|
static void
|
|
do_pre_login(Session *s)
|
|
{
|
|
socklen_t fromlen;
|
|
struct sockaddr_storage from;
|
|
pid_t pid = getpid();
|
|
|
|
/*
|
|
* Get IP address of client. If the connection is not a socket, let
|
|
* the address be 0.0.0.0.
|
|
*/
|
|
memset(&from, 0, sizeof(from));
|
|
if (packet_connection_is_on_socket()) {
|
|
fromlen = sizeof(from);
|
|
if (getpeername(packet_get_connection_in(),
|
|
(struct sockaddr *) & from, &fromlen) < 0) {
|
|
debug("getpeername: %.100s", strerror(errno));
|
|
fatal_cleanup();
|
|
}
|
|
}
|
|
|
|
record_utmp_only(pid, s->tty, s->pw->pw_name,
|
|
get_remote_name_or_ip(utmp_len, options.verify_reverse_mapping),
|
|
(struct sockaddr *)&from);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* This is called to fork and execute a command. If another command is
|
|
* to be forced, execute that instead.
|
|
*/
|
|
void
|
|
do_exec(Session *s, const char *command)
|
|
{
|
|
if (forced_command) {
|
|
original_command = command;
|
|
command = forced_command;
|
|
debug("Forced command '%.900s'", command);
|
|
}
|
|
|
|
if (s->ttyfd != -1)
|
|
do_exec_pty(s, command);
|
|
else
|
|
do_exec_no_pty(s, command);
|
|
|
|
original_command = NULL;
|
|
}
|
|
|
|
|
|
/* administrative, login(1)-like work */
|
|
void
|
|
do_login(Session *s, const char *command)
|
|
{
|
|
char *time_string;
|
|
socklen_t fromlen;
|
|
struct sockaddr_storage from;
|
|
struct passwd * pw = s->pw;
|
|
pid_t pid = getpid();
|
|
|
|
/*
|
|
* Get IP address of client. If the connection is not a socket, let
|
|
* the address be 0.0.0.0.
|
|
*/
|
|
memset(&from, 0, sizeof(from));
|
|
if (packet_connection_is_on_socket()) {
|
|
fromlen = sizeof(from);
|
|
if (getpeername(packet_get_connection_in(),
|
|
(struct sockaddr *) & from, &fromlen) < 0) {
|
|
debug("getpeername: %.100s", strerror(errno));
|
|
fatal_cleanup();
|
|
}
|
|
}
|
|
|
|
/* Record that there was a login on that tty from the remote host. */
|
|
if (!use_privsep)
|
|
record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
|
|
get_remote_name_or_ip(utmp_len,
|
|
options.verify_reverse_mapping),
|
|
(struct sockaddr *)&from);
|
|
|
|
#ifdef USE_PAM
|
|
/*
|
|
* If password change is needed, do it now.
|
|
* This needs to occur before the ~/.hushlogin check.
|
|
*/
|
|
if (is_pam_password_change_required()) {
|
|
print_pam_messages();
|
|
do_pam_chauthtok();
|
|
}
|
|
#endif
|
|
|
|
if (check_quietlogin(s, command))
|
|
return;
|
|
|
|
#ifdef USE_PAM
|
|
if (!is_pam_password_change_required())
|
|
print_pam_messages();
|
|
#endif /* USE_PAM */
|
|
#ifdef WITH_AIXAUTHENTICATE
|
|
if (aixloginmsg && *aixloginmsg)
|
|
printf("%s\n", aixloginmsg);
|
|
#endif /* WITH_AIXAUTHENTICATE */
|
|
|
|
if (options.print_lastlog && s->last_login_time != 0) {
|
|
time_string = ctime(&s->last_login_time);
|
|
if (strchr(time_string, '\n'))
|
|
*strchr(time_string, '\n') = 0;
|
|
if (strcmp(s->hostname, "") == 0)
|
|
printf("Last login: %s\r\n", time_string);
|
|
else
|
|
printf("Last login: %s from %s\r\n", time_string,
|
|
s->hostname);
|
|
}
|
|
|
|
do_motd();
|
|
}
|
|
|
|
/*
|
|
* Display the message of the day.
|
|
*/
|
|
void
|
|
do_motd(void)
|
|
{
|
|
FILE *f;
|
|
char buf[256];
|
|
|
|
if (options.print_motd) {
|
|
#ifdef HAVE_LOGIN_CAP
|
|
f = fopen(login_getcapstr(lc, "welcome", "/etc/motd",
|
|
"/etc/motd"), "r");
|
|
#else
|
|
f = fopen("/etc/motd", "r");
|
|
#endif
|
|
if (f) {
|
|
while (fgets(buf, sizeof(buf), f))
|
|
fputs(buf, stdout);
|
|
fclose(f);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Check for quiet login, either .hushlogin or command given.
|
|
*/
|
|
int
|
|
check_quietlogin(Session *s, const char *command)
|
|
{
|
|
char buf[256];
|
|
struct passwd *pw = s->pw;
|
|
struct stat st;
|
|
|
|
/* Return 1 if .hushlogin exists or a command given. */
|
|
if (command != NULL)
|
|
return 1;
|
|
snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
|
|
#ifdef HAVE_LOGIN_CAP
|
|
if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
|
|
return 1;
|
|
#else
|
|
if (stat(buf, &st) >= 0)
|
|
return 1;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Sets the value of the given variable in the environment. If the variable
|
|
* already exists, its value is overriden.
|
|
*/
|
|
static void
|
|
child_set_env(char ***envp, u_int *envsizep, const char *name,
|
|
const char *value)
|
|
{
|
|
u_int i, namelen;
|
|
char **env;
|
|
|
|
/*
|
|
* Find the slot where the value should be stored. If the variable
|
|
* already exists, we reuse the slot; otherwise we append a new slot
|
|
* at the end of the array, expanding if necessary.
|
|
*/
|
|
env = *envp;
|
|
namelen = strlen(name);
|
|
for (i = 0; env[i]; i++)
|
|
if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
|
|
break;
|
|
if (env[i]) {
|
|
/* Reuse the slot. */
|
|
xfree(env[i]);
|
|
} else {
|
|
/* New variable. Expand if necessary. */
|
|
if (i >= (*envsizep) - 1) {
|
|
(*envsizep) += 50;
|
|
env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *));
|
|
}
|
|
/* Need to set the NULL pointer at end of array beyond the new slot. */
|
|
env[i + 1] = NULL;
|
|
}
|
|
|
|
/* Allocate space and format the variable in the appropriate slot. */
|
|
env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
|
|
snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
|
|
}
|
|
|
|
/*
|
|
* Reads environment variables from the given file and adds/overrides them
|
|
* into the environment. If the file does not exist, this does nothing.
|
|
* Otherwise, it must consist of empty lines, comments (line starts with '#')
|
|
* and assignments of the form name=value. No other forms are allowed.
|
|
*/
|
|
static void
|
|
read_environment_file(char ***env, u_int *envsize,
|
|
const char *filename)
|
|
{
|
|
FILE *f;
|
|
char buf[4096];
|
|
char *cp, *value;
|
|
|
|
f = fopen(filename, "r");
|
|
if (!f)
|
|
return;
|
|
|
|
while (fgets(buf, sizeof(buf), f)) {
|
|
for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
|
|
;
|
|
if (!*cp || *cp == '#' || *cp == '\n')
|
|
continue;
|
|
if (strchr(cp, '\n'))
|
|
*strchr(cp, '\n') = '\0';
|
|
value = strchr(cp, '=');
|
|
if (value == NULL) {
|
|
fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf);
|
|
continue;
|
|
}
|
|
/*
|
|
* Replace the equals sign by nul, and advance value to
|
|
* the value string.
|
|
*/
|
|
*value = '\0';
|
|
value++;
|
|
child_set_env(env, envsize, cp, value);
|
|
}
|
|
fclose(f);
|
|
}
|
|
|
|
void copy_environment(char **source, char ***env, u_int *envsize)
|
|
{
|
|
char *var_name, *var_val;
|
|
int i;
|
|
|
|
if (source == NULL)
|
|
return;
|
|
|
|
for(i = 0; source[i] != NULL; i++) {
|
|
var_name = xstrdup(source[i]);
|
|
if ((var_val = strstr(var_name, "=")) == NULL) {
|
|
xfree(var_name);
|
|
continue;
|
|
}
|
|
*var_val++ = '\0';
|
|
|
|
debug3("Copy environment: %s=%s", var_name, var_val);
|
|
child_set_env(env, envsize, var_name, var_val);
|
|
|
|
xfree(var_name);
|
|
}
|
|
}
|
|
|
|
static char **
|
|
do_setup_env(Session *s, const char *shell)
|
|
{
|
|
char buf[256];
|
|
u_int i, envsize;
|
|
char **env;
|
|
struct passwd *pw = s->pw;
|
|
|
|
/* Initialize the environment. */
|
|
envsize = 100;
|
|
env = xmalloc(envsize * sizeof(char *));
|
|
env[0] = NULL;
|
|
|
|
#ifdef HAVE_CYGWIN
|
|
/*
|
|
* The Windows environment contains some setting which are
|
|
* important for a running system. They must not be dropped.
|
|
*/
|
|
copy_environment(environ, &env, &envsize);
|
|
#endif
|
|
|
|
if (!options.use_login) {
|
|
/* Set basic environment. */
|
|
child_set_env(&env, &envsize, "USER", pw->pw_name);
|
|
child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
|
|
child_set_env(&env, &envsize, "HOME", pw->pw_dir);
|
|
#ifdef HAVE_LOGIN_CAP
|
|
(void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH);
|
|
child_set_env(&env, &envsize, "PATH", getenv("PATH"));
|
|
#else /* HAVE_LOGIN_CAP */
|
|
# ifndef HAVE_CYGWIN
|
|
/*
|
|
* There's no standard path on Windows. The path contains
|
|
* important components pointing to the system directories,
|
|
* needed for loading shared libraries. So the path better
|
|
* remains intact here.
|
|
*/
|
|
# ifdef SUPERUSER_PATH
|
|
child_set_env(&env, &envsize, "PATH",
|
|
s->pw->pw_uid == 0 ? SUPERUSER_PATH : _PATH_STDPATH);
|
|
# else
|
|
child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
|
|
# endif /* SUPERUSER_PATH */
|
|
# endif /* HAVE_CYGWIN */
|
|
#endif /* HAVE_LOGIN_CAP */
|
|
|
|
snprintf(buf, sizeof buf, "%.200s/%.50s",
|
|
_PATH_MAILDIR, pw->pw_name);
|
|
child_set_env(&env, &envsize, "MAIL", buf);
|
|
|
|
/* Normal systems set SHELL by default. */
|
|
child_set_env(&env, &envsize, "SHELL", shell);
|
|
}
|
|
if (getenv("TZ"))
|
|
child_set_env(&env, &envsize, "TZ", getenv("TZ"));
|
|
|
|
/* Set custom environment options from RSA authentication. */
|
|
if (!options.use_login) {
|
|
while (custom_environment) {
|
|
struct envstring *ce = custom_environment;
|
|
char *s = ce->s;
|
|
|
|
for (i = 0; s[i] != '=' && s[i]; i++)
|
|
;
|
|
if (s[i] == '=') {
|
|
s[i] = 0;
|
|
child_set_env(&env, &envsize, s, s + i + 1);
|
|
}
|
|
custom_environment = ce->next;
|
|
xfree(ce->s);
|
|
xfree(ce);
|
|
}
|
|
}
|
|
|
|
snprintf(buf, sizeof buf, "%.50s %d %d",
|
|
get_remote_ipaddr(), get_remote_port(), get_local_port());
|
|
child_set_env(&env, &envsize, "SSH_CLIENT", buf);
|
|
|
|
if (s->ttyfd != -1)
|
|
child_set_env(&env, &envsize, "SSH_TTY", s->tty);
|
|
if (s->term)
|
|
child_set_env(&env, &envsize, "TERM", s->term);
|
|
if (s->display)
|
|
child_set_env(&env, &envsize, "DISPLAY", s->display);
|
|
if (original_command)
|
|
child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
|
|
original_command);
|
|
|
|
#ifdef _AIX
|
|
{
|
|
char *cp;
|
|
|
|
if ((cp = getenv("AUTHSTATE")) != NULL)
|
|
child_set_env(&env, &envsize, "AUTHSTATE", cp);
|
|
if ((cp = getenv("KRB5CCNAME")) != NULL)
|
|
child_set_env(&env, &envsize, "KRB5CCNAME", cp);
|
|
read_environment_file(&env, &envsize, "/etc/environment");
|
|
}
|
|
#endif
|
|
#ifdef KRB4
|
|
if (s->authctxt->krb4_ticket_file)
|
|
child_set_env(&env, &envsize, "KRBTKFILE",
|
|
s->authctxt->krb4_ticket_file);
|
|
#endif
|
|
#ifdef KRB5
|
|
if (s->authctxt->krb5_ticket_file)
|
|
child_set_env(&env, &envsize, "KRB5CCNAME",
|
|
s->authctxt->krb5_ticket_file);
|
|
#endif
|
|
#ifdef USE_PAM
|
|
/* Pull in any environment variables that may have been set by PAM. */
|
|
copy_environment(fetch_pam_environment(), &env, &envsize);
|
|
#endif /* USE_PAM */
|
|
|
|
if (auth_sock_name != NULL)
|
|
child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
|
|
auth_sock_name);
|
|
|
|
/* read $HOME/.ssh/environment. */
|
|
if (!options.use_login) {
|
|
snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
|
|
pw->pw_dir);
|
|
read_environment_file(&env, &envsize, buf);
|
|
}
|
|
if (debug_flag) {
|
|
/* dump the environment */
|
|
fprintf(stderr, "Environment:\n");
|
|
for (i = 0; env[i]; i++)
|
|
fprintf(stderr, " %.200s\n", env[i]);
|
|
}
|
|
return env;
|
|
}
|
|
|
|
/*
|
|
* Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
|
|
* first in this order).
|
|
*/
|
|
static void
|
|
do_rc_files(Session *s, const char *shell)
|
|
{
|
|
FILE *f = NULL;
|
|
char cmd[1024];
|
|
int do_xauth;
|
|
struct stat st;
|
|
|
|
do_xauth =
|
|
s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
|
|
|
|
/* ignore _PATH_SSH_USER_RC for subsystems */
|
|
if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
|
|
snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
|
|
shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
|
|
if (debug_flag)
|
|
fprintf(stderr, "Running %s\n", cmd);
|
|
f = popen(cmd, "w");
|
|
if (f) {
|
|
if (do_xauth)
|
|
fprintf(f, "%s %s\n", s->auth_proto,
|
|
s->auth_data);
|
|
pclose(f);
|
|
} else
|
|
fprintf(stderr, "Could not run %s\n",
|
|
_PATH_SSH_USER_RC);
|
|
} else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
|
|
if (debug_flag)
|
|
fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
|
|
_PATH_SSH_SYSTEM_RC);
|
|
f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
|
|
if (f) {
|
|
if (do_xauth)
|
|
fprintf(f, "%s %s\n", s->auth_proto,
|
|
s->auth_data);
|
|
pclose(f);
|
|
} else
|
|
fprintf(stderr, "Could not run %s\n",
|
|
_PATH_SSH_SYSTEM_RC);
|
|
} else if (do_xauth && options.xauth_location != NULL) {
|
|
/* Add authority data to .Xauthority if appropriate. */
|
|
if (debug_flag) {
|
|
fprintf(stderr,
|
|
"Running %.500s add "
|
|
"%.100s %.100s %.100s\n",
|
|
options.xauth_location, s->auth_display,
|
|
s->auth_proto, s->auth_data);
|
|
}
|
|
snprintf(cmd, sizeof cmd, "%s -q -",
|
|
options.xauth_location);
|
|
f = popen(cmd, "w");
|
|
if (f) {
|
|
fprintf(f, "add %s %s %s\n",
|
|
s->auth_display, s->auth_proto,
|
|
s->auth_data);
|
|
pclose(f);
|
|
} else {
|
|
fprintf(stderr, "Could not run %s\n",
|
|
cmd);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
do_nologin(struct passwd *pw)
|
|
{
|
|
FILE *f = NULL;
|
|
char buf[1024];
|
|
|
|
#ifdef HAVE_LOGIN_CAP
|
|
if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
|
|
f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
|
|
_PATH_NOLOGIN), "r");
|
|
#else
|
|
if (pw->pw_uid)
|
|
f = fopen(_PATH_NOLOGIN, "r");
|
|
#endif
|
|
if (f) {
|
|
/* /etc/nologin exists. Print its contents and exit. */
|
|
while (fgets(buf, sizeof(buf), f))
|
|
fputs(buf, stderr);
|
|
fclose(f);
|
|
exit(254);
|
|
}
|
|
}
|
|
|
|
/* Set login name, uid, gid, and groups. */
|
|
void
|
|
do_setusercontext(struct passwd *pw)
|
|
{
|
|
#ifdef HAVE_CYGWIN
|
|
if (is_winnt) {
|
|
#else /* HAVE_CYGWIN */
|
|
if (getuid() == 0 || geteuid() == 0) {
|
|
#endif /* HAVE_CYGWIN */
|
|
#ifdef HAVE_SETPCRED
|
|
setpcred(pw->pw_name);
|
|
#endif /* HAVE_SETPCRED */
|
|
#ifdef HAVE_LOGIN_CAP
|
|
if (setusercontext(lc, pw, pw->pw_uid,
|
|
(LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
|
|
perror("unable to set user context");
|
|
exit(1);
|
|
}
|
|
#else
|
|
# if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
|
|
/* Sets login uid for accounting */
|
|
if (getluid() == -1 && setluid(pw->pw_uid) == -1)
|
|
error("setluid: %s", strerror(errno));
|
|
# endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
|
|
|
|
if (setlogin(pw->pw_name) < 0)
|
|
error("setlogin failed: %s", strerror(errno));
|
|
if (setgid(pw->pw_gid) < 0) {
|
|
perror("setgid");
|
|
exit(1);
|
|
}
|
|
/* Initialize the group list. */
|
|
if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
|
|
perror("initgroups");
|
|
exit(1);
|
|
}
|
|
endgrent();
|
|
# ifdef USE_PAM
|
|
/*
|
|
* PAM credentials may take the form of supplementary groups.
|
|
* These will have been wiped by the above initgroups() call.
|
|
* Reestablish them here.
|
|
*/
|
|
do_pam_setcred(0);
|
|
# endif /* USE_PAM */
|
|
# if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)
|
|
irix_setusercontext(pw);
|
|
# endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
|
|
/* Permanently switch to the desired uid. */
|
|
permanently_set_uid(pw);
|
|
#endif
|
|
}
|
|
if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
|
|
fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
|
|
}
|
|
|
|
static void
|
|
launch_login(struct passwd *pw, const char *hostname)
|
|
{
|
|
/* Launch login(1). */
|
|
|
|
execl(LOGIN_PROGRAM, "login", "-h", hostname,
|
|
#ifdef xxxLOGIN_NEEDS_TERM
|
|
(s->term ? s->term : "unknown"),
|
|
#endif /* LOGIN_NEEDS_TERM */
|
|
#ifdef LOGIN_NO_ENDOPT
|
|
"-p", "-f", pw->pw_name, (char *)NULL);
|
|
#else
|
|
"-p", "-f", "--", pw->pw_name, (char *)NULL);
|
|
#endif
|
|
|
|
/* Login couldn't be executed, die. */
|
|
|
|
perror("login");
|
|
exit(1);
|
|
}
|
|
|
|
/*
|
|
* Performs common processing for the child, such as setting up the
|
|
* environment, closing extra file descriptors, setting the user and group
|
|
* ids, and executing the command or shell.
|
|
*/
|
|
void
|
|
do_child(Session *s, const char *command)
|
|
{
|
|
extern char **environ;
|
|
char **env;
|
|
char *argv[10];
|
|
const char *shell, *shell0, *hostname = NULL;
|
|
struct passwd *pw = s->pw;
|
|
u_int i;
|
|
|
|
/* remove hostkey from the child's memory */
|
|
destroy_sensitive_data();
|
|
|
|
/* login(1) is only called if we execute the login shell */
|
|
if (options.use_login && command != NULL)
|
|
options.use_login = 0;
|
|
|
|
/*
|
|
* Login(1) does this as well, and it needs uid 0 for the "-h"
|
|
* switch, so we let login(1) to this for us.
|
|
*/
|
|
if (!options.use_login) {
|
|
#ifdef HAVE_OSF_SIA
|
|
session_setup_sia(pw->pw_name, s->ttyfd == -1 ? NULL : s->tty);
|
|
if (!check_quietlogin(s, command))
|
|
do_motd();
|
|
#else /* HAVE_OSF_SIA */
|
|
do_nologin(pw);
|
|
# ifdef _AIX
|
|
aix_usrinfo(pw, s->tty, s->ttyfd);
|
|
# endif /* _AIX */
|
|
do_setusercontext(pw);
|
|
#endif /* HAVE_OSF_SIA */
|
|
}
|
|
|
|
/*
|
|
* Get the shell from the password data. An empty shell field is
|
|
* legal, and means /bin/sh.
|
|
*/
|
|
shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
|
|
#ifdef HAVE_LOGIN_CAP
|
|
shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
|
|
#endif
|
|
|
|
env = do_setup_env(s, shell);
|
|
|
|
/* we have to stash the hostname before we close our socket. */
|
|
if (options.use_login)
|
|
hostname = get_remote_name_or_ip(utmp_len,
|
|
options.verify_reverse_mapping);
|
|
/*
|
|
* Close the connection descriptors; note that this is the child, and
|
|
* the server will still have the socket open, and it is important
|
|
* that we do not shutdown it. Note that the descriptors cannot be
|
|
* closed before building the environment, as we call
|
|
* get_remote_ipaddr there.
|
|
*/
|
|
if (packet_get_connection_in() == packet_get_connection_out())
|
|
close(packet_get_connection_in());
|
|
else {
|
|
close(packet_get_connection_in());
|
|
close(packet_get_connection_out());
|
|
}
|
|
/*
|
|
* Close all descriptors related to channels. They will still remain
|
|
* open in the parent.
|
|
*/
|
|
/* XXX better use close-on-exec? -markus */
|
|
channel_close_all();
|
|
|
|
/*
|
|
* Close any extra file descriptors. Note that there may still be
|
|
* descriptors left by system functions. They will be closed later.
|
|
*/
|
|
endpwent();
|
|
|
|
/*
|
|
* Close any extra open file descriptors so that we don\'t have them
|
|
* hanging around in clients. Note that we want to do this after
|
|
* initgroups, because at least on Solaris 2.3 it leaves file
|
|
* descriptors open.
|
|
*/
|
|
for (i = 3; i < 64; i++)
|
|
close(i);
|
|
|
|
/*
|
|
* Must take new environment into use so that .ssh/rc,
|
|
* /etc/ssh/sshrc and xauth are run in the proper environment.
|
|
*/
|
|
environ = env;
|
|
|
|
#ifdef AFS
|
|
/* Try to get AFS tokens for the local cell. */
|
|
if (k_hasafs()) {
|
|
char cell[64];
|
|
|
|
if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
|
|
krb_afslog(cell, 0);
|
|
|
|
krb_afslog(0, 0);
|
|
}
|
|
#endif /* AFS */
|
|
|
|
/* Change current directory to the user\'s home directory. */
|
|
if (chdir(pw->pw_dir) < 0) {
|
|
fprintf(stderr, "Could not chdir to home directory %s: %s\n",
|
|
pw->pw_dir, strerror(errno));
|
|
#ifdef HAVE_LOGIN_CAP
|
|
if (login_getcapbool(lc, "requirehome", 0))
|
|
exit(1);
|
|
#endif
|
|
}
|
|
|
|
if (!options.use_login)
|
|
do_rc_files(s, shell);
|
|
|
|
/* restore SIGPIPE for child */
|
|
signal(SIGPIPE, SIG_DFL);
|
|
|
|
if (options.use_login) {
|
|
launch_login(pw, hostname);
|
|
/* NEVERREACHED */
|
|
}
|
|
|
|
/* Get the last component of the shell name. */
|
|
if ((shell0 = strrchr(shell, '/')) != NULL)
|
|
shell0++;
|
|
else
|
|
shell0 = shell;
|
|
|
|
/*
|
|
* If we have no command, execute the shell. In this case, the shell
|
|
* name to be passed in argv[0] is preceded by '-' to indicate that
|
|
* this is a login shell.
|
|
*/
|
|
if (!command) {
|
|
char argv0[256];
|
|
|
|
/* Start the shell. Set initial character to '-'. */
|
|
argv0[0] = '-';
|
|
|
|
if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
|
|
>= sizeof(argv0) - 1) {
|
|
errno = EINVAL;
|
|
perror(shell);
|
|
exit(1);
|
|
}
|
|
|
|
/* Execute the shell. */
|
|
argv[0] = argv0;
|
|
argv[1] = NULL;
|
|
execve(shell, argv, env);
|
|
|
|
/* Executing the shell failed. */
|
|
perror(shell);
|
|
exit(1);
|
|
}
|
|
/*
|
|
* Execute the command using the user's shell. This uses the -c
|
|
* option to execute the command.
|
|
*/
|
|
argv[0] = (char *) shell0;
|
|
argv[1] = "-c";
|
|
argv[2] = (char *) command;
|
|
argv[3] = NULL;
|
|
execve(shell, argv, env);
|
|
perror(shell);
|
|
exit(1);
|
|
}
|
|
|
|
Session *
|
|
session_new(void)
|
|
{
|
|
int i;
|
|
static int did_init = 0;
|
|
if (!did_init) {
|
|
debug("session_new: init");
|
|
for (i = 0; i < MAX_SESSIONS; i++) {
|
|
sessions[i].used = 0;
|
|
}
|
|
did_init = 1;
|
|
}
|
|
for (i = 0; i < MAX_SESSIONS; i++) {
|
|
Session *s = &sessions[i];
|
|
if (! s->used) {
|
|
memset(s, 0, sizeof(*s));
|
|
s->chanid = -1;
|
|
s->ptyfd = -1;
|
|
s->ttyfd = -1;
|
|
s->used = 1;
|
|
s->self = i;
|
|
debug("session_new: session %d", i);
|
|
return s;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
session_dump(void)
|
|
{
|
|
int i;
|
|
for (i = 0; i < MAX_SESSIONS; i++) {
|
|
Session *s = &sessions[i];
|
|
debug("dump: used %d session %d %p channel %d pid %ld",
|
|
s->used,
|
|
s->self,
|
|
s,
|
|
s->chanid,
|
|
(long)s->pid);
|
|
}
|
|
}
|
|
|
|
int
|
|
session_open(Authctxt *authctxt, int chanid)
|
|
{
|
|
Session *s = session_new();
|
|
debug("session_open: channel %d", chanid);
|
|
if (s == NULL) {
|
|
error("no more sessions");
|
|
return 0;
|
|
}
|
|
s->authctxt = authctxt;
|
|
s->pw = authctxt->pw;
|
|
if (s->pw == NULL)
|
|
fatal("no user for session %d", s->self);
|
|
debug("session_open: session %d: link with channel %d", s->self, chanid);
|
|
s->chanid = chanid;
|
|
return 1;
|
|
}
|
|
|
|
Session *
|
|
session_by_tty(char *tty)
|
|
{
|
|
int i;
|
|
for (i = 0; i < MAX_SESSIONS; i++) {
|
|
Session *s = &sessions[i];
|
|
if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
|
|
debug("session_by_tty: session %d tty %s", i, tty);
|
|
return s;
|
|
}
|
|
}
|
|
debug("session_by_tty: unknown tty %.100s", tty);
|
|
session_dump();
|
|
return NULL;
|
|
}
|
|
|
|
static Session *
|
|
session_by_channel(int id)
|
|
{
|
|
int i;
|
|
for (i = 0; i < MAX_SESSIONS; i++) {
|
|
Session *s = &sessions[i];
|
|
if (s->used && s->chanid == id) {
|
|
debug("session_by_channel: session %d channel %d", i, id);
|
|
return s;
|
|
}
|
|
}
|
|
debug("session_by_channel: unknown channel %d", id);
|
|
session_dump();
|
|
return NULL;
|
|
}
|
|
|
|
static Session *
|
|
session_by_pid(pid_t pid)
|
|
{
|
|
int i;
|
|
debug("session_by_pid: pid %ld", (long)pid);
|
|
for (i = 0; i < MAX_SESSIONS; i++) {
|
|
Session *s = &sessions[i];
|
|
if (s->used && s->pid == pid)
|
|
return s;
|
|
}
|
|
error("session_by_pid: unknown pid %ld", (long)pid);
|
|
session_dump();
|
|
return NULL;
|
|
}
|
|
|
|
static int
|
|
session_window_change_req(Session *s)
|
|
{
|
|
s->col = packet_get_int();
|
|
s->row = packet_get_int();
|
|
s->xpixel = packet_get_int();
|
|
s->ypixel = packet_get_int();
|
|
packet_check_eom();
|
|
pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
session_pty_req(Session *s)
|
|
{
|
|
u_int len;
|
|
int n_bytes;
|
|
|
|
if (no_pty_flag) {
|
|
debug("Allocating a pty not permitted for this authentication.");
|
|
return 0;
|
|
}
|
|
if (s->ttyfd != -1) {
|
|
packet_disconnect("Protocol error: you already have a pty.");
|
|
return 0;
|
|
}
|
|
/* Get the time and hostname when the user last logged in. */
|
|
if (options.print_lastlog) {
|
|
s->hostname[0] = '\0';
|
|
s->last_login_time = get_last_login_time(s->pw->pw_uid,
|
|
s->pw->pw_name, s->hostname, sizeof(s->hostname));
|
|
}
|
|
|
|
s->term = packet_get_string(&len);
|
|
|
|
if (compat20) {
|
|
s->col = packet_get_int();
|
|
s->row = packet_get_int();
|
|
} else {
|
|
s->row = packet_get_int();
|
|
s->col = packet_get_int();
|
|
}
|
|
s->xpixel = packet_get_int();
|
|
s->ypixel = packet_get_int();
|
|
|
|
if (strcmp(s->term, "") == 0) {
|
|
xfree(s->term);
|
|
s->term = NULL;
|
|
}
|
|
|
|
/* Allocate a pty and open it. */
|
|
debug("Allocating pty.");
|
|
if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) {
|
|
if (s->term)
|
|
xfree(s->term);
|
|
s->term = NULL;
|
|
s->ptyfd = -1;
|
|
s->ttyfd = -1;
|
|
error("session_pty_req: session %d alloc failed", s->self);
|
|
return 0;
|
|
}
|
|
debug("session_pty_req: session %d alloc %s", s->self, s->tty);
|
|
|
|
/* for SSH1 the tty modes length is not given */
|
|
if (!compat20)
|
|
n_bytes = packet_remaining();
|
|
tty_parse_modes(s->ttyfd, &n_bytes);
|
|
|
|
/*
|
|
* Add a cleanup function to clear the utmp entry and record logout
|
|
* time in case we call fatal() (e.g., the connection gets closed).
|
|
*/
|
|
fatal_add_cleanup(session_pty_cleanup, (void *)s);
|
|
if (!use_privsep)
|
|
pty_setowner(s->pw, s->tty);
|
|
|
|
/* Set window size from the packet. */
|
|
pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
|
|
|
|
packet_check_eom();
|
|
session_proctitle(s);
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
session_subsystem_req(Session *s)
|
|
{
|
|
struct stat st;
|
|
u_int len;
|
|
int success = 0;
|
|
char *cmd, *subsys = packet_get_string(&len);
|
|
int i;
|
|
|
|
packet_check_eom();
|
|
log("subsystem request for %.100s", subsys);
|
|
|
|
for (i = 0; i < options.num_subsystems; i++) {
|
|
if (strcmp(subsys, options.subsystem_name[i]) == 0) {
|
|
cmd = options.subsystem_command[i];
|
|
if (stat(cmd, &st) < 0) {
|
|
error("subsystem: cannot stat %s: %s", cmd,
|
|
strerror(errno));
|
|
break;
|
|
}
|
|
debug("subsystem: exec() %s", cmd);
|
|
s->is_subsystem = 1;
|
|
do_exec(s, cmd);
|
|
success = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!success)
|
|
log("subsystem request for %.100s failed, subsystem not found",
|
|
subsys);
|
|
|
|
xfree(subsys);
|
|
return success;
|
|
}
|
|
|
|
static int
|
|
session_x11_req(Session *s)
|
|
{
|
|
int success;
|
|
|
|
s->single_connection = packet_get_char();
|
|
s->auth_proto = packet_get_string(NULL);
|
|
s->auth_data = packet_get_string(NULL);
|
|
s->screen = packet_get_int();
|
|
packet_check_eom();
|
|
|
|
success = session_setup_x11fwd(s);
|
|
if (!success) {
|
|
xfree(s->auth_proto);
|
|
xfree(s->auth_data);
|
|
s->auth_proto = NULL;
|
|
s->auth_data = NULL;
|
|
}
|
|
return success;
|
|
}
|
|
|
|
static int
|
|
session_shell_req(Session *s)
|
|
{
|
|
packet_check_eom();
|
|
do_exec(s, NULL);
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
session_exec_req(Session *s)
|
|
{
|
|
u_int len;
|
|
char *command = packet_get_string(&len);
|
|
packet_check_eom();
|
|
do_exec(s, command);
|
|
xfree(command);
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
session_auth_agent_req(Session *s)
|
|
{
|
|
static int called = 0;
|
|
packet_check_eom();
|
|
if (no_agent_forwarding_flag) {
|
|
debug("session_auth_agent_req: no_agent_forwarding_flag");
|
|
return 0;
|
|
}
|
|
if (called) {
|
|
return 0;
|
|
} else {
|
|
called = 1;
|
|
return auth_input_request_forwarding(s->pw);
|
|
}
|
|
}
|
|
|
|
int
|
|
session_input_channel_req(Channel *c, const char *rtype)
|
|
{
|
|
int success = 0;
|
|
Session *s;
|
|
|
|
if ((s = session_by_channel(c->self)) == NULL) {
|
|
log("session_input_channel_req: no session %d req %.100s",
|
|
c->self, rtype);
|
|
return 0;
|
|
}
|
|
debug("session_input_channel_req: session %d req %s", s->self, rtype);
|
|
|
|
/*
|
|
* a session is in LARVAL state until a shell, a command
|
|
* or a subsystem is executed
|
|
*/
|
|
if (c->type == SSH_CHANNEL_LARVAL) {
|
|
if (strcmp(rtype, "shell") == 0) {
|
|
success = session_shell_req(s);
|
|
} else if (strcmp(rtype, "exec") == 0) {
|
|
success = session_exec_req(s);
|
|
} else if (strcmp(rtype, "pty-req") == 0) {
|
|
success = session_pty_req(s);
|
|
} else if (strcmp(rtype, "x11-req") == 0) {
|
|
success = session_x11_req(s);
|
|
} else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
|
|
success = session_auth_agent_req(s);
|
|
} else if (strcmp(rtype, "subsystem") == 0) {
|
|
success = session_subsystem_req(s);
|
|
}
|
|
}
|
|
if (strcmp(rtype, "window-change") == 0) {
|
|
success = session_window_change_req(s);
|
|
}
|
|
return success;
|
|
}
|
|
|
|
void
|
|
session_set_fds(Session *s, int fdin, int fdout, int fderr)
|
|
{
|
|
if (!compat20)
|
|
fatal("session_set_fds: called for proto != 2.0");
|
|
/*
|
|
* now that have a child and a pipe to the child,
|
|
* we can activate our channel and register the fd's
|
|
*/
|
|
if (s->chanid == -1)
|
|
fatal("no channel for session %d", s->self);
|
|
channel_set_fds(s->chanid,
|
|
fdout, fdin, fderr,
|
|
fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
|
|
1,
|
|
CHAN_SES_WINDOW_DEFAULT);
|
|
}
|
|
|
|
/*
|
|
* Function to perform pty cleanup. Also called if we get aborted abnormally
|
|
* (e.g., due to a dropped connection).
|
|
*/
|
|
void
|
|
session_pty_cleanup2(void *session)
|
|
{
|
|
Session *s = session;
|
|
|
|
if (s == NULL) {
|
|
error("session_pty_cleanup: no session");
|
|
return;
|
|
}
|
|
if (s->ttyfd == -1)
|
|
return;
|
|
|
|
debug("session_pty_cleanup: session %d release %s", s->self, s->tty);
|
|
|
|
/* Record that the user has logged out. */
|
|
if (s->pid != 0)
|
|
record_logout(s->pid, s->tty, s->pw->pw_name);
|
|
|
|
/* Release the pseudo-tty. */
|
|
if (getuid() == 0)
|
|
pty_release(s->tty);
|
|
|
|
/*
|
|
* Close the server side of the socket pairs. We must do this after
|
|
* the pty cleanup, so that another process doesn't get this pty
|
|
* while we're still cleaning up.
|
|
*/
|
|
if (close(s->ptymaster) < 0)
|
|
error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno));
|
|
|
|
/* unlink pty from session */
|
|
s->ttyfd = -1;
|
|
}
|
|
|
|
void
|
|
session_pty_cleanup(void *session)
|
|
{
|
|
PRIVSEP(session_pty_cleanup2(session));
|
|
}
|
|
|
|
static void
|
|
session_exit_message(Session *s, int status)
|
|
{
|
|
Channel *c;
|
|
|
|
if ((c = channel_lookup(s->chanid)) == NULL)
|
|
fatal("session_exit_message: session %d: no channel %d",
|
|
s->self, s->chanid);
|
|
debug("session_exit_message: session %d channel %d pid %ld",
|
|
s->self, s->chanid, (long)s->pid);
|
|
|
|
if (WIFEXITED(status)) {
|
|
channel_request_start(s->chanid, "exit-status", 0);
|
|
packet_put_int(WEXITSTATUS(status));
|
|
packet_send();
|
|
} else if (WIFSIGNALED(status)) {
|
|
channel_request_start(s->chanid, "exit-signal", 0);
|
|
packet_put_int(WTERMSIG(status));
|
|
#ifdef WCOREDUMP
|
|
packet_put_char(WCOREDUMP(status));
|
|
#else /* WCOREDUMP */
|
|
packet_put_char(0);
|
|
#endif /* WCOREDUMP */
|
|
packet_put_cstring("");
|
|
packet_put_cstring("");
|
|
packet_send();
|
|
} else {
|
|
/* Some weird exit cause. Just exit. */
|
|
packet_disconnect("wait returned status %04x.", status);
|
|
}
|
|
|
|
/* disconnect channel */
|
|
debug("session_exit_message: release channel %d", s->chanid);
|
|
channel_cancel_cleanup(s->chanid);
|
|
/*
|
|
* emulate a write failure with 'chan_write_failed', nobody will be
|
|
* interested in data we write.
|
|
* Note that we must not call 'chan_read_failed', since there could
|
|
* be some more data waiting in the pipe.
|
|
*/
|
|
if (c->ostate != CHAN_OUTPUT_CLOSED)
|
|
chan_write_failed(c);
|
|
s->chanid = -1;
|
|
}
|
|
|
|
void
|
|
session_close(Session *s)
|
|
{
|
|
debug("session_close: session %d pid %ld", s->self, (long)s->pid);
|
|
if (s->ttyfd != -1) {
|
|
fatal_remove_cleanup(session_pty_cleanup, (void *)s);
|
|
session_pty_cleanup(s);
|
|
}
|
|
if (s->term)
|
|
xfree(s->term);
|
|
if (s->display)
|
|
xfree(s->display);
|
|
if (s->auth_display)
|
|
xfree(s->auth_display);
|
|
if (s->auth_data)
|
|
xfree(s->auth_data);
|
|
if (s->auth_proto)
|
|
xfree(s->auth_proto);
|
|
s->used = 0;
|
|
session_proctitle(s);
|
|
}
|
|
|
|
void
|
|
session_close_by_pid(pid_t pid, int status)
|
|
{
|
|
Session *s = session_by_pid(pid);
|
|
if (s == NULL) {
|
|
debug("session_close_by_pid: no session for pid %ld",
|
|
(long)pid);
|
|
return;
|
|
}
|
|
if (s->chanid != -1)
|
|
session_exit_message(s, status);
|
|
session_close(s);
|
|
}
|
|
|
|
/*
|
|
* this is called when a channel dies before
|
|
* the session 'child' itself dies
|
|
*/
|
|
void
|
|
session_close_by_channel(int id, void *arg)
|
|
{
|
|
Session *s = session_by_channel(id);
|
|
if (s == NULL) {
|
|
debug("session_close_by_channel: no session for id %d", id);
|
|
return;
|
|
}
|
|
debug("session_close_by_channel: channel %d child %ld",
|
|
id, (long)s->pid);
|
|
if (s->pid != 0) {
|
|
debug("session_close_by_channel: channel %d: has child", id);
|
|
/*
|
|
* delay detach of session, but release pty, since
|
|
* the fd's to the child are already closed
|
|
*/
|
|
if (s->ttyfd != -1) {
|
|
fatal_remove_cleanup(session_pty_cleanup, (void *)s);
|
|
session_pty_cleanup(s);
|
|
}
|
|
return;
|
|
}
|
|
/* detach by removing callback */
|
|
channel_cancel_cleanup(s->chanid);
|
|
s->chanid = -1;
|
|
session_close(s);
|
|
}
|
|
|
|
void
|
|
session_destroy_all(void (*closefunc)(Session *))
|
|
{
|
|
int i;
|
|
for (i = 0; i < MAX_SESSIONS; i++) {
|
|
Session *s = &sessions[i];
|
|
if (s->used) {
|
|
if (closefunc != NULL)
|
|
closefunc(s);
|
|
else
|
|
session_close(s);
|
|
}
|
|
}
|
|
}
|
|
|
|
static char *
|
|
session_tty_list(void)
|
|
{
|
|
static char buf[1024];
|
|
int i;
|
|
buf[0] = '\0';
|
|
for (i = 0; i < MAX_SESSIONS; i++) {
|
|
Session *s = &sessions[i];
|
|
if (s->used && s->ttyfd != -1) {
|
|
if (buf[0] != '\0')
|
|
strlcat(buf, ",", sizeof buf);
|
|
strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
|
|
}
|
|
}
|
|
if (buf[0] == '\0')
|
|
strlcpy(buf, "notty", sizeof buf);
|
|
return buf;
|
|
}
|
|
|
|
void
|
|
session_proctitle(Session *s)
|
|
{
|
|
if (s->pw == NULL)
|
|
error("no user for session %d", s->self);
|
|
else
|
|
setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
|
|
}
|
|
|
|
int
|
|
session_setup_x11fwd(Session *s)
|
|
{
|
|
struct stat st;
|
|
char display[512], auth_display[512];
|
|
char hostname[MAXHOSTNAMELEN];
|
|
|
|
if (no_x11_forwarding_flag) {
|
|
packet_send_debug("X11 forwarding disabled in user configuration file.");
|
|
return 0;
|
|
}
|
|
if (!options.x11_forwarding) {
|
|
debug("X11 forwarding disabled in server configuration file.");
|
|
return 0;
|
|
}
|
|
if (!options.xauth_location ||
|
|
(stat(options.xauth_location, &st) == -1)) {
|
|
packet_send_debug("No xauth program; cannot forward with spoofing.");
|
|
return 0;
|
|
}
|
|
if (options.use_login) {
|
|
packet_send_debug("X11 forwarding disabled; "
|
|
"not compatible with UseLogin=yes.");
|
|
return 0;
|
|
}
|
|
if (s->display != NULL) {
|
|
debug("X11 display already set.");
|
|
return 0;
|
|
}
|
|
if (x11_create_display_inet(options.x11_display_offset,
|
|
options.x11_use_localhost, s->single_connection,
|
|
&s->display_number) == -1) {
|
|
debug("x11_create_display_inet failed.");
|
|
return 0;
|
|
}
|
|
|
|
/* Set up a suitable value for the DISPLAY variable. */
|
|
if (gethostname(hostname, sizeof(hostname)) < 0)
|
|
fatal("gethostname: %.100s", strerror(errno));
|
|
/*
|
|
* auth_display must be used as the displayname when the
|
|
* authorization entry is added with xauth(1). This will be
|
|
* different than the DISPLAY string for localhost displays.
|
|
*/
|
|
if (options.x11_use_localhost) {
|
|
snprintf(display, sizeof display, "localhost:%u.%u",
|
|
s->display_number, s->screen);
|
|
snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
|
|
s->display_number, s->screen);
|
|
s->display = xstrdup(display);
|
|
s->auth_display = xstrdup(auth_display);
|
|
} else {
|
|
#ifdef IPADDR_IN_DISPLAY
|
|
struct hostent *he;
|
|
struct in_addr my_addr;
|
|
|
|
he = gethostbyname(hostname);
|
|
if (he == NULL) {
|
|
error("Can't get IP address for X11 DISPLAY.");
|
|
packet_send_debug("Can't get IP address for X11 DISPLAY.");
|
|
return 0;
|
|
}
|
|
memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
|
|
snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr),
|
|
s->display_number, s->screen);
|
|
#else
|
|
snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
|
|
s->display_number, s->screen);
|
|
#endif
|
|
s->display = xstrdup(display);
|
|
s->auth_display = xstrdup(display);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
do_authenticated2(Authctxt *authctxt)
|
|
{
|
|
server_loop2(authctxt);
|
|
}
|