deraadt@openbsd.org | 9e509d4 | 2017-05-31 09:15:42 +0000 | [diff] [blame] | 1 | /* $OpenBSD: session.c,v 1.288 2017/05/31 09:15:42 deraadt Exp $ */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2 | /* |
| 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 4 | * All rights reserved |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 5 | * |
| 6 | * As far as I am concerned, the code I have written for this software |
| 7 | * can be used freely for any purpose. Any derived versions of this |
| 8 | * software must be clearly marked as such, and if the derived work is |
| 9 | * incompatible with the protocol description in the RFC file, it must be |
| 10 | * called by a name other than "ssh" or "Secure Shell". |
| 11 | * |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 12 | * SSH2 support by Markus Friedl. |
Ben Lindstrom | 4469723 | 2001-07-04 03:32:30 +0000 | [diff] [blame] | 13 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 14 | * |
| 15 | * Redistribution and use in source and binary forms, with or without |
| 16 | * modification, are permitted provided that the following conditions |
| 17 | * are met: |
| 18 | * 1. Redistributions of source code must retain the above copyright |
| 19 | * notice, this list of conditions and the following disclaimer. |
| 20 | * 2. Redistributions in binary form must reproduce the above copyright |
| 21 | * notice, this list of conditions and the following disclaimer in the |
| 22 | * documentation and/or other materials provided with the distribution. |
| 23 | * |
| 24 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 25 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 26 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 27 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 28 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 29 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 30 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 31 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 32 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 33 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 34 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 35 | |
| 36 | #include "includes.h" |
Damien Miller | 9cf6d07 | 2006-03-15 11:29:24 +1100 | [diff] [blame] | 37 | |
| 38 | #include <sys/types.h> |
Damien Miller | 8dbffe7 | 2006-08-05 11:02:17 +1000 | [diff] [blame] | 39 | #include <sys/param.h> |
Damien Miller | f17883e | 2006-03-15 11:45:54 +1100 | [diff] [blame] | 40 | #ifdef HAVE_SYS_STAT_H |
| 41 | # include <sys/stat.h> |
| 42 | #endif |
Damien Miller | e3b60b5 | 2006-07-10 21:08:03 +1000 | [diff] [blame] | 43 | #include <sys/socket.h> |
Damien Miller | 574c41f | 2006-03-15 11:40:10 +1100 | [diff] [blame] | 44 | #include <sys/un.h> |
Damien Miller | 8dbffe7 | 2006-08-05 11:02:17 +1000 | [diff] [blame] | 45 | #include <sys/wait.h> |
Damien Miller | 03e2003 | 2006-03-15 11:16:59 +1100 | [diff] [blame] | 46 | |
Damien Miller | 1cdde6f | 2006-07-24 14:07:35 +1000 | [diff] [blame] | 47 | #include <arpa/inet.h> |
| 48 | |
djm@openbsd.org | 4b4bfb0 | 2016-03-10 11:47:57 +0000 | [diff] [blame] | 49 | #include <ctype.h> |
Darren Tucker | 3997249 | 2006-07-12 22:22:46 +1000 | [diff] [blame] | 50 | #include <errno.h> |
Damien Miller | 22a2988 | 2010-05-10 11:53:54 +1000 | [diff] [blame] | 51 | #include <fcntl.h> |
Damien Miller | 427a1d5 | 2006-07-10 20:20:33 +1000 | [diff] [blame] | 52 | #include <grp.h> |
Damien Miller | e5c0d52 | 2014-07-03 21:24:19 +1000 | [diff] [blame] | 53 | #include <netdb.h> |
Damien Miller | 6645e7a | 2006-03-15 14:42:54 +1100 | [diff] [blame] | 54 | #ifdef HAVE_PATHS_H |
Damien Miller | 03e2003 | 2006-03-15 11:16:59 +1100 | [diff] [blame] | 55 | #include <paths.h> |
Damien Miller | 6645e7a | 2006-03-15 14:42:54 +1100 | [diff] [blame] | 56 | #endif |
Damien Miller | 9f2abc4 | 2006-07-10 20:53:08 +1000 | [diff] [blame] | 57 | #include <pwd.h> |
Damien Miller | 6ff3cad | 2006-03-15 11:52:09 +1100 | [diff] [blame] | 58 | #include <signal.h> |
Damien Miller | ded319c | 2006-09-01 15:38:36 +1000 | [diff] [blame] | 59 | #include <stdarg.h> |
Damien Miller | a7a73ee | 2006-08-05 11:37:59 +1000 | [diff] [blame] | 60 | #include <stdio.h> |
Damien Miller | e7a1e5c | 2006-08-05 11:34:19 +1000 | [diff] [blame] | 61 | #include <stdlib.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 62 | #include <string.h> |
Damien Miller | 1cdde6f | 2006-07-24 14:07:35 +1000 | [diff] [blame] | 63 | #include <unistd.h> |
deraadt@openbsd.org | 2ae4f33 | 2015-01-16 06:40:12 +0000 | [diff] [blame] | 64 | #include <limits.h> |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 65 | |
Damien Miller | b84886b | 2008-05-19 15:05:07 +1000 | [diff] [blame] | 66 | #include "openbsd-compat/sys-queue.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 67 | #include "xmalloc.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 68 | #include "ssh.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 69 | #include "ssh2.h" |
Ben Lindstrom | d95c09c | 2001-02-18 19:13:33 +0000 | [diff] [blame] | 70 | #include "sshpty.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 71 | #include "packet.h" |
| 72 | #include "buffer.h" |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 73 | #include "match.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 74 | #include "uidswap.h" |
| 75 | #include "compat.h" |
Ben Lindstrom | c763767 | 2001-06-09 00:36:26 +0000 | [diff] [blame] | 76 | #include "channels.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 77 | #include "key.h" |
| 78 | #include "cipher.h" |
| 79 | #ifdef GSSAPI |
| 80 | #include "ssh-gss.h" |
| 81 | #endif |
| 82 | #include "hostfile.h" |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 83 | #include "auth.h" |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 84 | #include "auth-options.h" |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 85 | #include "authfd.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 86 | #include "pathnames.h" |
| 87 | #include "log.h" |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 88 | #include "misc.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 89 | #include "servconf.h" |
Ben Lindstrom | d95c09c | 2001-02-18 19:13:33 +0000 | [diff] [blame] | 90 | #include "sshlogin.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 91 | #include "serverloop.h" |
| 92 | #include "canohost.h" |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 93 | #include "session.h" |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 94 | #include "kex.h" |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 95 | #include "monitor_wrap.h" |
Damien Miller | dfc2425 | 2008-02-10 22:29:40 +1100 | [diff] [blame] | 96 | #include "sftp.h" |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 97 | |
Darren Tucker | 3c78c5e | 2004-01-23 22:03:10 +1100 | [diff] [blame] | 98 | #if defined(KRB5) && defined(USE_AFS) |
Damien Miller | 8f341f8 | 2004-01-21 11:00:46 +1100 | [diff] [blame] | 99 | #include <kafs.h> |
| 100 | #endif |
| 101 | |
Damien Miller | 14684a1 | 2011-05-20 11:23:07 +1000 | [diff] [blame] | 102 | #ifdef WITH_SELINUX |
| 103 | #include <selinux/selinux.h> |
| 104 | #endif |
| 105 | |
Damien Miller | ad793d5 | 2008-11-03 19:17:57 +1100 | [diff] [blame] | 106 | #define IS_INTERNAL_SFTP(c) \ |
| 107 | (!strncmp(c, INTERNAL_SFTP_NAME, sizeof(INTERNAL_SFTP_NAME) - 1) && \ |
| 108 | (c[sizeof(INTERNAL_SFTP_NAME) - 1] == '\0' || \ |
| 109 | c[sizeof(INTERNAL_SFTP_NAME) - 1] == ' ' || \ |
| 110 | c[sizeof(INTERNAL_SFTP_NAME) - 1] == '\t')) |
| 111 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 112 | /* func */ |
| 113 | |
| 114 | Session *session_new(void); |
Damien Miller | 8853ca5 | 2010-06-26 10:00:14 +1000 | [diff] [blame] | 115 | void session_set_fds(Session *, int, int, int, int, int); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 116 | void session_pty_cleanup(Session *); |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 117 | void session_proctitle(Session *); |
| 118 | int session_setup_x11fwd(Session *); |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 119 | int do_exec_pty(Session *, const char *); |
| 120 | int do_exec_no_pty(Session *, const char *); |
| 121 | int do_exec(Session *, const char *); |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 122 | void do_login(Session *, const char *); |
Kevin Steves | a0957d6 | 2001-09-27 19:50:26 +0000 | [diff] [blame] | 123 | #ifdef LOGIN_NEEDS_UTMPX |
| 124 | static void do_pre_login(Session *s); |
| 125 | #endif |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 126 | void do_child(Session *, const char *); |
Damien Miller | cf205e8 | 2001-04-16 18:29:15 +1000 | [diff] [blame] | 127 | void do_motd(void); |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 128 | int check_quietlogin(Session *, const char *); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 129 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 130 | static void do_authenticated2(Authctxt *); |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 131 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 132 | static int session_pty_req(Session *); |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 133 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 134 | /* import */ |
| 135 | extern ServerOptions options; |
| 136 | extern char *__progname; |
| 137 | extern int log_stderr; |
| 138 | extern int debug_flag; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 139 | extern u_int utmp_len; |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 140 | extern int startup_pipe; |
Ben Lindstrom | 005dd22 | 2001-04-18 15:29:33 +0000 | [diff] [blame] | 141 | extern void destroy_sensitive_data(void); |
Darren Tucker | b9aa0a0 | 2003-07-08 22:59:59 +1000 | [diff] [blame] | 142 | extern Buffer loginmsg; |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 143 | |
Damien Miller | 7b28dc5 | 2000-09-05 13:34:53 +1100 | [diff] [blame] | 144 | /* original command from peer. */ |
Ben Lindstrom | 0a7ca6c | 2001-06-21 03:17:42 +0000 | [diff] [blame] | 145 | const char *original_command = NULL; |
Damien Miller | 7b28dc5 | 2000-09-05 13:34:53 +1100 | [diff] [blame] | 146 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 147 | /* data */ |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 148 | static int sessions_first_unused = -1; |
| 149 | static int sessions_nalloc = 0; |
| 150 | static Session *sessions = NULL; |
Damien Miller | 15e7d4b | 2000-09-29 10:57:35 +1100 | [diff] [blame] | 151 | |
Darren Tucker | d6b06a9 | 2010-01-08 17:09:11 +1100 | [diff] [blame] | 152 | #define SUBSYSTEM_NONE 0 |
| 153 | #define SUBSYSTEM_EXT 1 |
| 154 | #define SUBSYSTEM_INT_SFTP 2 |
| 155 | #define SUBSYSTEM_INT_SFTP_ERROR 3 |
Damien Miller | dfc2425 | 2008-02-10 22:29:40 +1100 | [diff] [blame] | 156 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 157 | #ifdef HAVE_LOGIN_CAP |
Ben Lindstrom | b481e13 | 2002-03-22 01:35:47 +0000 | [diff] [blame] | 158 | login_cap_t *lc; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 159 | #endif |
| 160 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 161 | static int is_child = 0; |
djm@openbsd.org | 44fc7cd | 2015-10-24 22:52:22 +0000 | [diff] [blame] | 162 | static int in_chroot = 0; |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 163 | |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 164 | /* Name and directory of socket for authentication agent forwarding. */ |
| 165 | static char *auth_sock_name = NULL; |
| 166 | static char *auth_sock_dir = NULL; |
| 167 | |
| 168 | /* removes the agent forwarding socket */ |
| 169 | |
| 170 | static void |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 171 | auth_sock_cleanup_proc(struct passwd *pw) |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 172 | { |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 173 | if (auth_sock_name != NULL) { |
| 174 | temporarily_use_uid(pw); |
| 175 | unlink(auth_sock_name); |
| 176 | rmdir(auth_sock_dir); |
| 177 | auth_sock_name = NULL; |
| 178 | restore_uid(); |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | static int |
| 183 | auth_input_request_forwarding(struct passwd * pw) |
| 184 | { |
| 185 | Channel *nc; |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 186 | int sock = -1; |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 187 | |
| 188 | if (auth_sock_name != NULL) { |
| 189 | error("authentication forwarding requested twice."); |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | /* Temporarily drop privileged uid for mkdir/bind. */ |
| 194 | temporarily_use_uid(pw); |
| 195 | |
| 196 | /* Allocate a buffer for the socket name, and format the name. */ |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 197 | auth_sock_dir = xstrdup("/tmp/ssh-XXXXXXXXXX"); |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 198 | |
| 199 | /* Create private directory for socket */ |
| 200 | if (mkdtemp(auth_sock_dir) == NULL) { |
| 201 | packet_send_debug("Agent forwarding disabled: " |
| 202 | "mkdtemp() failed: %.100s", strerror(errno)); |
| 203 | restore_uid(); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 204 | free(auth_sock_dir); |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 205 | auth_sock_dir = NULL; |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 206 | goto authsock_err; |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 207 | } |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 208 | |
| 209 | xasprintf(&auth_sock_name, "%s/agent.%ld", |
| 210 | auth_sock_dir, (long) getpid()); |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 211 | |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 212 | /* Start a Unix listener on auth_sock_name. */ |
| 213 | sock = unix_listener(auth_sock_name, SSH_LISTEN_BACKLOG, 0); |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 214 | |
| 215 | /* Restore the privileged uid. */ |
| 216 | restore_uid(); |
| 217 | |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 218 | /* Check for socket/bind/listen failure. */ |
| 219 | if (sock < 0) |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 220 | goto authsock_err; |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 221 | |
| 222 | /* Allocate a channel for the authentication agent socket. */ |
| 223 | nc = channel_new("auth socket", |
| 224 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, |
| 225 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 226 | 0, "auth socket", 1); |
Damien Miller | a1c1b6c | 2009-01-28 16:29:49 +1100 | [diff] [blame] | 227 | nc->path = xstrdup(auth_sock_name); |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 228 | return 1; |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 229 | |
| 230 | authsock_err: |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 231 | free(auth_sock_name); |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 232 | if (auth_sock_dir != NULL) { |
| 233 | rmdir(auth_sock_dir); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 234 | free(auth_sock_dir); |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 235 | } |
| 236 | if (sock != -1) |
| 237 | close(sock); |
| 238 | auth_sock_name = NULL; |
| 239 | auth_sock_dir = NULL; |
| 240 | return 0; |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 241 | } |
| 242 | |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 243 | static void |
| 244 | display_loginmsg(void) |
| 245 | { |
Damien Miller | 46d38de | 2005-07-17 17:02:09 +1000 | [diff] [blame] | 246 | if (buffer_len(&loginmsg) > 0) { |
| 247 | buffer_append(&loginmsg, "\0", 1); |
| 248 | printf("%s", (char *)buffer_ptr(&loginmsg)); |
| 249 | buffer_clear(&loginmsg); |
| 250 | } |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 251 | } |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 252 | |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 253 | void |
| 254 | do_authenticated(Authctxt *authctxt) |
| 255 | { |
Damien Miller | 97f39ae | 2003-02-24 11:57:01 +1100 | [diff] [blame] | 256 | setproctitle("%s", authctxt->pw->pw_name); |
| 257 | |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 258 | /* setup the channel layer */ |
Damien Miller | 7acefbb | 2014-07-18 14:11:24 +1000 | [diff] [blame] | 259 | /* XXX - streamlocal? */ |
djm@openbsd.org | 7844f35 | 2016-11-30 03:00:05 +0000 | [diff] [blame] | 260 | if (no_port_forwarding_flag || options.disable_forwarding || |
Damien Miller | aa5b3f8 | 2012-12-03 09:50:54 +1100 | [diff] [blame] | 261 | (options.allow_tcp_forwarding & FORWARD_LOCAL) == 0) |
| 262 | channel_disable_adm_local_opens(); |
| 263 | else |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 264 | channel_permit_all_opens(); |
| 265 | |
Darren Tucker | cd70e1b | 2010-03-07 23:05:17 +1100 | [diff] [blame] | 266 | auth_debug_send(); |
| 267 | |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 268 | do_authenticated2(authctxt); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 269 | do_cleanup(authctxt); |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 270 | } |
| 271 | |
djm@openbsd.org | 4b4bfb0 | 2016-03-10 11:47:57 +0000 | [diff] [blame] | 272 | /* Check untrusted xauth strings for metacharacters */ |
| 273 | static int |
| 274 | xauth_valid_string(const char *s) |
| 275 | { |
| 276 | size_t i; |
| 277 | |
| 278 | for (i = 0; s[i] != '\0'; i++) { |
| 279 | if (!isalnum((u_char)s[i]) && |
| 280 | s[i] != '.' && s[i] != ':' && s[i] != '/' && |
| 281 | s[i] != '-' && s[i] != '_') |
| 282 | return 0; |
| 283 | } |
| 284 | return 1; |
| 285 | } |
| 286 | |
Darren Tucker | 293ee3c | 2014-01-19 15:28:01 +1100 | [diff] [blame] | 287 | #define USE_PIPES 1 |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 288 | /* |
| 289 | * This is called to fork and execute a command when we have no tty. This |
| 290 | * will call do_child from the child, and server_loop from the parent after |
| 291 | * setting up file descriptors and such. |
| 292 | */ |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 293 | int |
Ben Lindstrom | b4c961d | 2001-03-22 01:25:37 +0000 | [diff] [blame] | 294 | do_exec_no_pty(Session *s, const char *command) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 295 | { |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 296 | pid_t pid; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 297 | |
| 298 | #ifdef USE_PIPES |
| 299 | int pin[2], pout[2], perr[2]; |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 300 | |
Damien Miller | 22a2988 | 2010-05-10 11:53:54 +1000 | [diff] [blame] | 301 | if (s == NULL) |
| 302 | fatal("do_exec_no_pty: no session"); |
| 303 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 304 | /* Allocate pipes for communicating with the program. */ |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 305 | if (pipe(pin) < 0) { |
| 306 | error("%s: pipe in: %.100s", __func__, strerror(errno)); |
| 307 | return -1; |
| 308 | } |
| 309 | if (pipe(pout) < 0) { |
| 310 | error("%s: pipe out: %.100s", __func__, strerror(errno)); |
| 311 | close(pin[0]); |
| 312 | close(pin[1]); |
| 313 | return -1; |
| 314 | } |
Damien Miller | 8853ca5 | 2010-06-26 10:00:14 +1000 | [diff] [blame] | 315 | if (pipe(perr) < 0) { |
| 316 | error("%s: pipe err: %.100s", __func__, |
| 317 | strerror(errno)); |
| 318 | close(pin[0]); |
| 319 | close(pin[1]); |
| 320 | close(pout[0]); |
| 321 | close(pout[1]); |
| 322 | return -1; |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 323 | } |
| 324 | #else |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 325 | int inout[2], err[2]; |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 326 | |
Damien Miller | 22a2988 | 2010-05-10 11:53:54 +1000 | [diff] [blame] | 327 | if (s == NULL) |
| 328 | fatal("do_exec_no_pty: no session"); |
| 329 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 330 | /* Uses socket pairs to communicate with the program. */ |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 331 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0) { |
| 332 | error("%s: socketpair #1: %.100s", __func__, strerror(errno)); |
| 333 | return -1; |
| 334 | } |
Damien Miller | 8853ca5 | 2010-06-26 10:00:14 +1000 | [diff] [blame] | 335 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) { |
| 336 | error("%s: socketpair #2: %.100s", __func__, |
| 337 | strerror(errno)); |
| 338 | close(inout[0]); |
| 339 | close(inout[1]); |
| 340 | return -1; |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 341 | } |
| 342 | #endif |
| 343 | |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 344 | session_proctitle(s); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 345 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 346 | /* Fork the child. */ |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 347 | switch ((pid = fork())) { |
| 348 | case -1: |
| 349 | error("%s: fork: %.100s", __func__, strerror(errno)); |
| 350 | #ifdef USE_PIPES |
| 351 | close(pin[0]); |
| 352 | close(pin[1]); |
| 353 | close(pout[0]); |
| 354 | close(pout[1]); |
Damien Miller | 8853ca5 | 2010-06-26 10:00:14 +1000 | [diff] [blame] | 355 | close(perr[0]); |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 356 | close(perr[1]); |
| 357 | #else |
| 358 | close(inout[0]); |
| 359 | close(inout[1]); |
| 360 | close(err[0]); |
Damien Miller | 8853ca5 | 2010-06-26 10:00:14 +1000 | [diff] [blame] | 361 | close(err[1]); |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 362 | #endif |
| 363 | return -1; |
| 364 | case 0: |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 365 | is_child = 1; |
Ben Lindstrom | 264ee30 | 2002-07-23 21:01:56 +0000 | [diff] [blame] | 366 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 367 | /* Child. Reinitialize the log since the pid has changed. */ |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 368 | log_init(__progname, options.log_level, |
| 369 | options.log_facility, log_stderr); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 370 | |
| 371 | /* |
| 372 | * Create a new session and process group since the 4.4BSD |
| 373 | * setlogin() affects the entire process group. |
| 374 | */ |
| 375 | if (setsid() < 0) |
| 376 | error("setsid failed: %.100s", strerror(errno)); |
| 377 | |
| 378 | #ifdef USE_PIPES |
| 379 | /* |
| 380 | * Redirect stdin. We close the parent side of the socket |
| 381 | * pair, and make the child side the standard input. |
| 382 | */ |
| 383 | close(pin[1]); |
| 384 | if (dup2(pin[0], 0) < 0) |
| 385 | perror("dup2 stdin"); |
| 386 | close(pin[0]); |
| 387 | |
| 388 | /* Redirect stdout. */ |
| 389 | close(pout[0]); |
| 390 | if (dup2(pout[1], 1) < 0) |
| 391 | perror("dup2 stdout"); |
| 392 | close(pout[1]); |
| 393 | |
| 394 | /* Redirect stderr. */ |
Damien Miller | 8853ca5 | 2010-06-26 10:00:14 +1000 | [diff] [blame] | 395 | close(perr[0]); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 396 | if (dup2(perr[1], 2) < 0) |
| 397 | perror("dup2 stderr"); |
| 398 | close(perr[1]); |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 399 | #else |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 400 | /* |
| 401 | * Redirect stdin, stdout, and stderr. Stdin and stdout will |
| 402 | * use the same socket, as some programs (particularly rdist) |
| 403 | * seem to depend on it. |
| 404 | */ |
| 405 | close(inout[1]); |
Damien Miller | 8853ca5 | 2010-06-26 10:00:14 +1000 | [diff] [blame] | 406 | close(err[1]); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 407 | if (dup2(inout[0], 0) < 0) /* stdin */ |
| 408 | perror("dup2 stdin"); |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 409 | if (dup2(inout[0], 1) < 0) /* stdout (same as stdin) */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 410 | perror("dup2 stdout"); |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 411 | close(inout[0]); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 412 | if (dup2(err[0], 2) < 0) /* stderr */ |
| 413 | perror("dup2 stderr"); |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 414 | close(err[0]); |
| 415 | #endif |
| 416 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 417 | |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 418 | #ifdef _UNICOS |
| 419 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ |
| 420 | #endif |
| 421 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 422 | /* Do processing for the child (exec command etc). */ |
Ben Lindstrom | 86fe868 | 2001-03-17 00:32:57 +0000 | [diff] [blame] | 423 | do_child(s, command); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 424 | /* NOTREACHED */ |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 425 | default: |
| 426 | break; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 427 | } |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 428 | |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 429 | #ifdef _UNICOS |
| 430 | signal(WJSIGNAL, cray_job_termination_handler); |
| 431 | #endif /* _UNICOS */ |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 432 | #ifdef HAVE_CYGWIN |
Darren Tucker | 9d86e5d | 2009-03-08 11:40:27 +1100 | [diff] [blame] | 433 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 434 | #endif |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 435 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 436 | s->pid = pid; |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 437 | /* Set interactive/non-interactive mode. */ |
Damien Miller | 0dac6fb | 2010-11-20 15:19:38 +1100 | [diff] [blame] | 438 | packet_set_interactive(s->display != NULL, |
| 439 | options.ip_qos_interactive, options.ip_qos_bulk); |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 440 | |
| 441 | /* |
| 442 | * Clear loginmsg, since it's the child's responsibility to display |
| 443 | * it to the user, otherwise multiple sessions may accumulate |
| 444 | * multiple copies of the login messages. |
| 445 | */ |
| 446 | buffer_clear(&loginmsg); |
| 447 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 448 | #ifdef USE_PIPES |
| 449 | /* We are the parent. Close the child sides of the pipes. */ |
| 450 | close(pin[0]); |
| 451 | close(pout[1]); |
| 452 | close(perr[1]); |
| 453 | |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 454 | session_set_fds(s, pin[1], pout[0], perr[0], |
| 455 | s->is_subsystem, 0); |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 456 | #else |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 457 | /* We are the parent. Close the child sides of the socket pairs. */ |
| 458 | close(inout[0]); |
| 459 | close(err[0]); |
| 460 | |
| 461 | /* |
| 462 | * Enter the interactive session. Note: server_loop must be able to |
| 463 | * handle the case that fdin and fdout are the same. |
| 464 | */ |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 465 | session_set_fds(s, inout[1], inout[1], err[1], |
| 466 | s->is_subsystem, 0); |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 467 | #endif |
| 468 | return 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 469 | } |
| 470 | |
| 471 | /* |
| 472 | * This is called to fork and execute a command when we have a tty. This |
| 473 | * will call do_child from the child, and server_loop from the parent after |
| 474 | * setting up file descriptors, controlling tty, updating wtmp, utmp, |
| 475 | * lastlog, and other such operations. |
| 476 | */ |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 477 | int |
Ben Lindstrom | b4c961d | 2001-03-22 01:25:37 +0000 | [diff] [blame] | 478 | do_exec_pty(Session *s, const char *command) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 479 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 480 | int fdout, ptyfd, ttyfd, ptymaster; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 481 | pid_t pid; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 482 | |
| 483 | if (s == NULL) |
| 484 | fatal("do_exec_pty: no session"); |
| 485 | ptyfd = s->ptyfd; |
| 486 | ttyfd = s->ttyfd; |
| 487 | |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 488 | /* |
| 489 | * Create another descriptor of the pty master side for use as the |
| 490 | * standard input. We could use the original descriptor, but this |
| 491 | * simplifies code in server_loop. The descriptor is bidirectional. |
| 492 | * Do this before forking (and cleanup in the child) so as to |
| 493 | * detect and gracefully fail out-of-fd conditions. |
| 494 | */ |
| 495 | if ((fdout = dup(ptyfd)) < 0) { |
| 496 | error("%s: dup #1: %s", __func__, strerror(errno)); |
| 497 | close(ttyfd); |
| 498 | close(ptyfd); |
| 499 | return -1; |
| 500 | } |
| 501 | /* we keep a reference to the pty master */ |
| 502 | if ((ptymaster = dup(ptyfd)) < 0) { |
| 503 | error("%s: dup #2: %s", __func__, strerror(errno)); |
| 504 | close(ttyfd); |
| 505 | close(ptyfd); |
| 506 | close(fdout); |
| 507 | return -1; |
| 508 | } |
| 509 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 510 | /* Fork the child. */ |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 511 | switch ((pid = fork())) { |
| 512 | case -1: |
| 513 | error("%s: fork: %.100s", __func__, strerror(errno)); |
| 514 | close(fdout); |
| 515 | close(ptymaster); |
| 516 | close(ttyfd); |
| 517 | close(ptyfd); |
| 518 | return -1; |
| 519 | case 0: |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 520 | is_child = 1; |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 521 | |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 522 | close(fdout); |
| 523 | close(ptymaster); |
| 524 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 525 | /* Child. Reinitialize the log because the pid has changed. */ |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 526 | log_init(__progname, options.log_level, |
| 527 | options.log_facility, log_stderr); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 528 | /* Close the master side of the pseudo tty. */ |
| 529 | close(ptyfd); |
| 530 | |
| 531 | /* Make the pseudo tty our controlling tty. */ |
| 532 | pty_make_controlling_tty(&ttyfd, s->tty); |
| 533 | |
Damien Miller | 9c75142 | 2001-10-10 15:02:46 +1000 | [diff] [blame] | 534 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ |
| 535 | if (dup2(ttyfd, 0) < 0) |
| 536 | error("dup2 stdin: %s", strerror(errno)); |
| 537 | if (dup2(ttyfd, 1) < 0) |
| 538 | error("dup2 stdout: %s", strerror(errno)); |
| 539 | if (dup2(ttyfd, 2) < 0) |
| 540 | error("dup2 stderr: %s", strerror(errno)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 541 | |
| 542 | /* Close the extra descriptor for the pseudo tty. */ |
| 543 | close(ttyfd); |
| 544 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 545 | /* record login, etc. similar to login(1) */ |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 546 | #ifdef _UNICOS |
otto@openbsd.org | fc041c4 | 2016-08-23 16:21:45 +0000 | [diff] [blame] | 547 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 548 | #endif /* _UNICOS */ |
otto@openbsd.org | fc041c4 | 2016-08-23 16:21:45 +0000 | [diff] [blame] | 549 | #ifndef HAVE_OSF_SIA |
| 550 | do_login(s, command); |
Damien Miller | 364a9bd | 2001-04-16 18:37:05 +1000 | [diff] [blame] | 551 | #endif |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 552 | /* |
| 553 | * Do common processing for the child, such as execing |
| 554 | * the command. |
| 555 | */ |
Darren Tucker | 43e7a35 | 2009-06-21 19:50:08 +1000 | [diff] [blame] | 556 | do_child(s, command); |
| 557 | /* NOTREACHED */ |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 558 | default: |
| 559 | break; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 560 | } |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 561 | |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 562 | #ifdef _UNICOS |
| 563 | signal(WJSIGNAL, cray_job_termination_handler); |
| 564 | #endif /* _UNICOS */ |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 565 | #ifdef HAVE_CYGWIN |
Darren Tucker | 9d86e5d | 2009-03-08 11:40:27 +1100 | [diff] [blame] | 566 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 567 | #endif |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 568 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 569 | s->pid = pid; |
| 570 | |
| 571 | /* Parent. Close the slave side of the pseudo tty. */ |
| 572 | close(ttyfd); |
| 573 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 574 | /* Enter interactive session. */ |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 575 | s->ptymaster = ptymaster; |
Damien Miller | 0dac6fb | 2010-11-20 15:19:38 +1100 | [diff] [blame] | 576 | packet_set_interactive(1, |
| 577 | options.ip_qos_interactive, options.ip_qos_bulk); |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 578 | session_set_fds(s, ptyfd, fdout, -1, 1, 1); |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 579 | return 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 580 | } |
| 581 | |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 582 | #ifdef LOGIN_NEEDS_UTMPX |
Damien Miller | 599d8eb | 2001-09-15 12:25:53 +1000 | [diff] [blame] | 583 | static void |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 584 | do_pre_login(Session *s) |
| 585 | { |
Darren Tucker | aa37768 | 2016-06-20 15:55:34 +1000 | [diff] [blame] | 586 | struct ssh *ssh = active_state; /* XXX */ |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 587 | socklen_t fromlen; |
| 588 | struct sockaddr_storage from; |
| 589 | pid_t pid = getpid(); |
| 590 | |
| 591 | /* |
| 592 | * Get IP address of client. If the connection is not a socket, let |
| 593 | * the address be 0.0.0.0. |
| 594 | */ |
| 595 | memset(&from, 0, sizeof(from)); |
Damien Miller | ebc2306 | 2002-09-04 16:45:09 +1000 | [diff] [blame] | 596 | fromlen = sizeof(from); |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 597 | if (packet_connection_is_on_socket()) { |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 598 | if (getpeername(packet_get_connection_in(), |
Damien Miller | 9096740 | 2006-03-26 14:07:26 +1100 | [diff] [blame] | 599 | (struct sockaddr *)&from, &fromlen) < 0) { |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 600 | debug("getpeername: %.100s", strerror(errno)); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 601 | cleanup_exit(255); |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 602 | } |
| 603 | } |
| 604 | |
| 605 | record_utmp_only(pid, s->tty, s->pw->pw_name, |
Darren Tucker | aa37768 | 2016-06-20 15:55:34 +1000 | [diff] [blame] | 606 | session_get_remote_name_or_ip(ssh, utmp_len, options.use_dns), |
Kevin Steves | 678ee51 | 2003-01-01 23:43:55 +0000 | [diff] [blame] | 607 | (struct sockaddr *)&from, fromlen); |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 608 | } |
| 609 | #endif |
| 610 | |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 611 | /* |
| 612 | * This is called to fork and execute a command. If another command is |
| 613 | * to be forced, execute that instead. |
| 614 | */ |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 615 | int |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 616 | do_exec(Session *s, const char *command) |
| 617 | { |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 618 | struct ssh *ssh = active_state; /* XXX */ |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 619 | int ret; |
djm@openbsd.org | 5a0fcb7 | 2016-02-16 03:37:48 +0000 | [diff] [blame] | 620 | const char *forced = NULL, *tty = NULL; |
| 621 | char session_type[1024]; |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 622 | |
Damien Miller | e275443 | 2006-07-24 14:06:47 +1000 | [diff] [blame] | 623 | if (options.adm_forced_command) { |
| 624 | original_command = command; |
| 625 | command = options.adm_forced_command; |
Damien Miller | 71df752 | 2013-10-15 12:12:02 +1100 | [diff] [blame] | 626 | forced = "(config)"; |
Damien Miller | e275443 | 2006-07-24 14:06:47 +1000 | [diff] [blame] | 627 | } else if (forced_command) { |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 628 | original_command = command; |
| 629 | command = forced_command; |
Damien Miller | 71df752 | 2013-10-15 12:12:02 +1100 | [diff] [blame] | 630 | forced = "(key-option)"; |
| 631 | } |
| 632 | if (forced != NULL) { |
Darren Tucker | d6b06a9 | 2010-01-08 17:09:11 +1100 | [diff] [blame] | 633 | if (IS_INTERNAL_SFTP(command)) { |
| 634 | s->is_subsystem = s->is_subsystem ? |
| 635 | SUBSYSTEM_INT_SFTP : SUBSYSTEM_INT_SFTP_ERROR; |
| 636 | } else if (s->is_subsystem) |
Damien Miller | dfc2425 | 2008-02-10 22:29:40 +1100 | [diff] [blame] | 637 | s->is_subsystem = SUBSYSTEM_EXT; |
Damien Miller | 71df752 | 2013-10-15 12:12:02 +1100 | [diff] [blame] | 638 | snprintf(session_type, sizeof(session_type), |
| 639 | "forced-command %s '%.900s'", forced, command); |
| 640 | } else if (s->is_subsystem) { |
| 641 | snprintf(session_type, sizeof(session_type), |
| 642 | "subsystem '%.900s'", s->subsys); |
| 643 | } else if (command == NULL) { |
| 644 | snprintf(session_type, sizeof(session_type), "shell"); |
| 645 | } else { |
| 646 | /* NB. we don't log unforced commands to preserve privacy */ |
| 647 | snprintf(session_type, sizeof(session_type), "command"); |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 648 | } |
| 649 | |
Damien Miller | 71df752 | 2013-10-15 12:12:02 +1100 | [diff] [blame] | 650 | if (s->ttyfd != -1) { |
| 651 | tty = s->tty; |
| 652 | if (strncmp(tty, "/dev/", 5) == 0) |
| 653 | tty += 5; |
| 654 | } |
| 655 | |
djm@openbsd.org | 5a0fcb7 | 2016-02-16 03:37:48 +0000 | [diff] [blame] | 656 | verbose("Starting session: %s%s%s for %s from %.200s port %d id %d", |
Damien Miller | 71df752 | 2013-10-15 12:12:02 +1100 | [diff] [blame] | 657 | session_type, |
| 658 | tty == NULL ? "" : " on ", |
| 659 | tty == NULL ? "" : tty, |
| 660 | s->pw->pw_name, |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 661 | ssh_remote_ipaddr(ssh), |
| 662 | ssh_remote_port(ssh), |
djm@openbsd.org | 5a0fcb7 | 2016-02-16 03:37:48 +0000 | [diff] [blame] | 663 | s->self); |
Damien Miller | 71df752 | 2013-10-15 12:12:02 +1100 | [diff] [blame] | 664 | |
Darren Tucker | 2e0cf0d | 2005-02-08 21:52:47 +1100 | [diff] [blame] | 665 | #ifdef SSH_AUDIT_EVENTS |
Darren Tucker | 269a1ea | 2005-02-03 00:20:53 +1100 | [diff] [blame] | 666 | if (command != NULL) |
| 667 | PRIVSEP(audit_run_command(command)); |
| 668 | else if (s->ttyfd == -1) { |
| 669 | char *shell = s->pw->pw_shell; |
| 670 | |
| 671 | if (shell[0] == '\0') /* empty shell means /bin/sh */ |
| 672 | shell =_PATH_BSHELL; |
| 673 | PRIVSEP(audit_run_command(shell)); |
| 674 | } |
| 675 | #endif |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 676 | if (s->ttyfd != -1) |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 677 | ret = do_exec_pty(s, command); |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 678 | else |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 679 | ret = do_exec_no_pty(s, command); |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 680 | |
Ben Lindstrom | 0a7ca6c | 2001-06-21 03:17:42 +0000 | [diff] [blame] | 681 | original_command = NULL; |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 682 | |
Darren Tucker | 0999174 | 2004-07-17 17:05:14 +1000 | [diff] [blame] | 683 | /* |
| 684 | * Clear loginmsg: it's the child's responsibility to display |
| 685 | * it to the user, otherwise multiple sessions may accumulate |
| 686 | * multiple copies of the login messages. |
| 687 | */ |
| 688 | buffer_clear(&loginmsg); |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 689 | |
| 690 | return ret; |
Darren Tucker | 0999174 | 2004-07-17 17:05:14 +1000 | [diff] [blame] | 691 | } |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 692 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 693 | /* administrative, login(1)-like work */ |
| 694 | void |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 695 | do_login(Session *s, const char *command) |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 696 | { |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 697 | struct ssh *ssh = active_state; /* XXX */ |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 698 | socklen_t fromlen; |
| 699 | struct sockaddr_storage from; |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 700 | struct passwd * pw = s->pw; |
| 701 | pid_t pid = getpid(); |
| 702 | |
| 703 | /* |
| 704 | * Get IP address of client. If the connection is not a socket, let |
| 705 | * the address be 0.0.0.0. |
| 706 | */ |
| 707 | memset(&from, 0, sizeof(from)); |
Kevin Steves | 678ee51 | 2003-01-01 23:43:55 +0000 | [diff] [blame] | 708 | fromlen = sizeof(from); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 709 | if (packet_connection_is_on_socket()) { |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 710 | if (getpeername(packet_get_connection_in(), |
Darren Tucker | 43e7a35 | 2009-06-21 19:50:08 +1000 | [diff] [blame] | 711 | (struct sockaddr *)&from, &fromlen) < 0) { |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 712 | debug("getpeername: %.100s", strerror(errno)); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 713 | cleanup_exit(255); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 714 | } |
| 715 | } |
| 716 | |
| 717 | /* Record that there was a login on that tty from the remote host. */ |
Ben Lindstrom | 2bf56e2 | 2002-04-02 20:32:46 +0000 | [diff] [blame] | 718 | if (!use_privsep) |
| 719 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 720 | session_get_remote_name_or_ip(ssh, utmp_len, |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 721 | options.use_dns), |
Damien Miller | ebc2306 | 2002-09-04 16:45:09 +1000 | [diff] [blame] | 722 | (struct sockaddr *)&from, fromlen); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 723 | |
Kevin Steves | 092f2ef | 2000-10-14 13:36:13 +0000 | [diff] [blame] | 724 | #ifdef USE_PAM |
| 725 | /* |
| 726 | * If password change is needed, do it now. |
| 727 | * This needs to occur before the ~/.hushlogin check. |
| 728 | */ |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 729 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
| 730 | display_loginmsg(); |
Kevin Steves | 092f2ef | 2000-10-14 13:36:13 +0000 | [diff] [blame] | 731 | do_pam_chauthtok(); |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 732 | s->authctxt->force_pwchange = 0; |
Damien Miller | 1f499fd | 2003-08-25 13:08:49 +1000 | [diff] [blame] | 733 | /* XXX - signal [net] parent to enable forwardings */ |
Kevin Steves | 092f2ef | 2000-10-14 13:36:13 +0000 | [diff] [blame] | 734 | } |
| 735 | #endif |
| 736 | |
Damien Miller | cf205e8 | 2001-04-16 18:29:15 +1000 | [diff] [blame] | 737 | if (check_quietlogin(s, command)) |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 738 | return; |
| 739 | |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 740 | display_loginmsg(); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 741 | |
Damien Miller | cf205e8 | 2001-04-16 18:29:15 +1000 | [diff] [blame] | 742 | do_motd(); |
| 743 | } |
| 744 | |
| 745 | /* |
| 746 | * Display the message of the day. |
| 747 | */ |
| 748 | void |
| 749 | do_motd(void) |
| 750 | { |
| 751 | FILE *f; |
| 752 | char buf[256]; |
| 753 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 754 | if (options.print_motd) { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 755 | #ifdef HAVE_LOGIN_CAP |
| 756 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", |
| 757 | "/etc/motd"), "r"); |
| 758 | #else |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 759 | f = fopen("/etc/motd", "r"); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 760 | #endif |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 761 | if (f) { |
| 762 | while (fgets(buf, sizeof(buf), f)) |
| 763 | fputs(buf, stdout); |
| 764 | fclose(f); |
| 765 | } |
| 766 | } |
| 767 | } |
| 768 | |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 769 | |
| 770 | /* |
| 771 | * Check for quiet login, either .hushlogin or command given. |
| 772 | */ |
| 773 | int |
| 774 | check_quietlogin(Session *s, const char *command) |
| 775 | { |
| 776 | char buf[256]; |
| 777 | struct passwd *pw = s->pw; |
| 778 | struct stat st; |
| 779 | |
| 780 | /* Return 1 if .hushlogin exists or a command given. */ |
| 781 | if (command != NULL) |
| 782 | return 1; |
| 783 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); |
| 784 | #ifdef HAVE_LOGIN_CAP |
| 785 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) |
| 786 | return 1; |
| 787 | #else |
| 788 | if (stat(buf, &st) >= 0) |
| 789 | return 1; |
| 790 | #endif |
| 791 | return 0; |
| 792 | } |
| 793 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 794 | /* |
| 795 | * Sets the value of the given variable in the environment. If the variable |
Darren Tucker | 63917bd | 2008-11-11 16:33:48 +1100 | [diff] [blame] | 796 | * already exists, its value is overridden. |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 797 | */ |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 798 | void |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 799 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 800 | const char *value) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 801 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 802 | char **env; |
Darren Tucker | fb16b24 | 2003-09-22 21:04:23 +1000 | [diff] [blame] | 803 | u_int envsize; |
| 804 | u_int i, namelen; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 805 | |
Damien Miller | 8569eba | 2014-03-04 09:35:17 +1100 | [diff] [blame] | 806 | if (strchr(name, '=') != NULL) { |
| 807 | error("Invalid environment variable \"%.100s\"", name); |
| 808 | return; |
| 809 | } |
| 810 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 811 | /* |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 812 | * If we're passed an uninitialized list, allocate a single null |
| 813 | * entry before continuing. |
| 814 | */ |
| 815 | if (*envp == NULL && *envsizep == 0) { |
| 816 | *envp = xmalloc(sizeof(char *)); |
| 817 | *envp[0] = NULL; |
| 818 | *envsizep = 1; |
| 819 | } |
| 820 | |
| 821 | /* |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 822 | * Find the slot where the value should be stored. If the variable |
| 823 | * already exists, we reuse the slot; otherwise we append a new slot |
| 824 | * at the end of the array, expanding if necessary. |
| 825 | */ |
| 826 | env = *envp; |
| 827 | namelen = strlen(name); |
| 828 | for (i = 0; env[i]; i++) |
| 829 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') |
| 830 | break; |
| 831 | if (env[i]) { |
| 832 | /* Reuse the slot. */ |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 833 | free(env[i]); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 834 | } else { |
| 835 | /* New variable. Expand if necessary. */ |
Darren Tucker | fb16b24 | 2003-09-22 21:04:23 +1000 | [diff] [blame] | 836 | envsize = *envsizep; |
| 837 | if (i >= envsize - 1) { |
| 838 | if (envsize >= 1000) |
| 839 | fatal("child_set_env: too many env vars"); |
| 840 | envsize += 50; |
deraadt@openbsd.org | 657a5fb | 2015-04-24 01:36:00 +0000 | [diff] [blame] | 841 | env = (*envp) = xreallocarray(env, envsize, sizeof(char *)); |
Darren Tucker | fb16b24 | 2003-09-22 21:04:23 +1000 | [diff] [blame] | 842 | *envsizep = envsize; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 843 | } |
| 844 | /* Need to set the NULL pointer at end of array beyond the new slot. */ |
| 845 | env[i + 1] = NULL; |
| 846 | } |
| 847 | |
| 848 | /* Allocate space and format the variable in the appropriate slot. */ |
| 849 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); |
| 850 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); |
| 851 | } |
| 852 | |
| 853 | /* |
| 854 | * Reads environment variables from the given file and adds/overrides them |
| 855 | * into the environment. If the file does not exist, this does nothing. |
| 856 | * Otherwise, it must consist of empty lines, comments (line starts with '#') |
| 857 | * and assignments of the form name=value. No other forms are allowed. |
| 858 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 859 | static void |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 860 | read_environment_file(char ***env, u_int *envsize, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 861 | const char *filename) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 862 | { |
| 863 | FILE *f; |
| 864 | char buf[4096]; |
| 865 | char *cp, *value; |
Damien Miller | 990070a | 2002-06-26 23:51:06 +1000 | [diff] [blame] | 866 | u_int lineno = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 867 | |
| 868 | f = fopen(filename, "r"); |
| 869 | if (!f) |
| 870 | return; |
| 871 | |
| 872 | while (fgets(buf, sizeof(buf), f)) { |
Damien Miller | 990070a | 2002-06-26 23:51:06 +1000 | [diff] [blame] | 873 | if (++lineno > 1000) |
| 874 | fatal("Too many lines in environment file %s", filename); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 875 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
| 876 | ; |
| 877 | if (!*cp || *cp == '#' || *cp == '\n') |
| 878 | continue; |
Damien Miller | 14b017d | 2007-09-17 16:09:15 +1000 | [diff] [blame] | 879 | |
| 880 | cp[strcspn(cp, "\n")] = '\0'; |
| 881 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 882 | value = strchr(cp, '='); |
| 883 | if (value == NULL) { |
Damien Miller | 990070a | 2002-06-26 23:51:06 +1000 | [diff] [blame] | 884 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
| 885 | filename); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 886 | continue; |
| 887 | } |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 888 | /* |
| 889 | * Replace the equals sign by nul, and advance value to |
| 890 | * the value string. |
| 891 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 892 | *value = '\0'; |
| 893 | value++; |
| 894 | child_set_env(env, envsize, cp, value); |
| 895 | } |
| 896 | fclose(f); |
| 897 | } |
| 898 | |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 899 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
| 900 | /* |
| 901 | * Return named variable from specified environment, or NULL if not present. |
| 902 | */ |
| 903 | static char * |
| 904 | child_get_env(char **env, const char *name) |
| 905 | { |
| 906 | int i; |
| 907 | size_t len; |
| 908 | |
| 909 | len = strlen(name); |
| 910 | for (i=0; env[i] != NULL; i++) |
| 911 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') |
| 912 | return(env[i] + len + 1); |
| 913 | return NULL; |
| 914 | } |
| 915 | |
| 916 | /* |
| 917 | * Read /etc/default/login. |
| 918 | * We pick up the PATH (or SUPATH for root) and UMASK. |
| 919 | */ |
| 920 | static void |
| 921 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) |
| 922 | { |
| 923 | char **tmpenv = NULL, *var; |
Darren Tucker | c11b1e8 | 2003-09-19 20:56:51 +1000 | [diff] [blame] | 924 | u_int i, tmpenvsize = 0; |
Darren Tucker | f391ba6 | 2003-10-02 20:07:09 +1000 | [diff] [blame] | 925 | u_long mask; |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 926 | |
| 927 | /* |
| 928 | * We don't want to copy the whole file to the child's environment, |
| 929 | * so we use a temporary environment and copy the variables we're |
| 930 | * interested in. |
| 931 | */ |
| 932 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); |
| 933 | |
Darren Tucker | c11b1e8 | 2003-09-19 20:56:51 +1000 | [diff] [blame] | 934 | if (tmpenv == NULL) |
| 935 | return; |
| 936 | |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 937 | if (uid == 0) |
| 938 | var = child_get_env(tmpenv, "SUPATH"); |
| 939 | else |
| 940 | var = child_get_env(tmpenv, "PATH"); |
| 941 | if (var != NULL) |
| 942 | child_set_env(env, envsize, "PATH", var); |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 943 | |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 944 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
| 945 | if (sscanf(var, "%5lo", &mask) == 1) |
Darren Tucker | f391ba6 | 2003-10-02 20:07:09 +1000 | [diff] [blame] | 946 | umask((mode_t)mask); |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 947 | |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 948 | for (i = 0; tmpenv[i] != NULL; i++) |
Darren Tucker | f60845f | 2013-06-02 08:07:31 +1000 | [diff] [blame] | 949 | free(tmpenv[i]); |
| 950 | free(tmpenv); |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 951 | } |
| 952 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ |
| 953 | |
Damien Miller | 7dff869 | 2005-05-26 11:34:51 +1000 | [diff] [blame] | 954 | void |
| 955 | copy_environment(char **source, char ***env, u_int *envsize) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 956 | { |
Damien Miller | bb9ffc1 | 2002-01-08 10:59:32 +1100 | [diff] [blame] | 957 | char *var_name, *var_val; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 958 | int i; |
| 959 | |
Damien Miller | bb9ffc1 | 2002-01-08 10:59:32 +1100 | [diff] [blame] | 960 | if (source == NULL) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 961 | return; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 962 | |
Damien Miller | bb9ffc1 | 2002-01-08 10:59:32 +1100 | [diff] [blame] | 963 | for(i = 0; source[i] != NULL; i++) { |
| 964 | var_name = xstrdup(source[i]); |
| 965 | if ((var_val = strstr(var_name, "=")) == NULL) { |
Darren Tucker | f60845f | 2013-06-02 08:07:31 +1000 | [diff] [blame] | 966 | free(var_name); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 967 | continue; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 968 | } |
Damien Miller | bb9ffc1 | 2002-01-08 10:59:32 +1100 | [diff] [blame] | 969 | *var_val++ = '\0'; |
| 970 | |
| 971 | debug3("Copy environment: %s=%s", var_name, var_val); |
| 972 | child_set_env(env, envsize, var_name, var_val); |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 973 | |
Darren Tucker | f60845f | 2013-06-02 08:07:31 +1000 | [diff] [blame] | 974 | free(var_name); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 975 | } |
| 976 | } |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 977 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 978 | static char ** |
| 979 | do_setup_env(Session *s, const char *shell) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 980 | { |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 981 | struct ssh *ssh = active_state; /* XXX */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 982 | char buf[256]; |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 983 | u_int i, envsize; |
Damien Miller | ad5ecbf | 2006-07-24 15:03:06 +1000 | [diff] [blame] | 984 | char **env, *laddr; |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 985 | struct passwd *pw = s->pw; |
Darren Tucker | 9d86e5d | 2009-03-08 11:40:27 +1100 | [diff] [blame] | 986 | #if !defined (HAVE_LOGIN_CAP) && !defined (HAVE_CYGWIN) |
Damien Miller | ad5ecbf | 2006-07-24 15:03:06 +1000 | [diff] [blame] | 987 | char *path = NULL; |
| 988 | #endif |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 989 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 990 | /* Initialize the environment. */ |
| 991 | envsize = 100; |
Darren Tucker | d8093e4 | 2006-05-04 16:24:34 +1000 | [diff] [blame] | 992 | env = xcalloc(envsize, sizeof(char *)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 993 | env[0] = NULL; |
| 994 | |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 995 | #ifdef HAVE_CYGWIN |
| 996 | /* |
| 997 | * The Windows environment contains some setting which are |
| 998 | * important for a running system. They must not be dropped. |
| 999 | */ |
Darren Tucker | 14c372d | 2004-08-30 20:42:08 +1000 | [diff] [blame] | 1000 | { |
| 1001 | char **p; |
| 1002 | |
| 1003 | p = fetch_windows_environment(); |
| 1004 | copy_environment(p, &env, &envsize); |
| 1005 | free_windows_environment(p); |
| 1006 | } |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 1007 | #endif |
| 1008 | |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 1009 | #ifdef GSSAPI |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 1010 | /* Allow any GSSAPI methods that we've used to alter |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 1011 | * the childs environment as they see fit |
| 1012 | */ |
| 1013 | ssh_gssapi_do_child(&env, &envsize); |
| 1014 | #endif |
| 1015 | |
djm@openbsd.org | 83b5818 | 2016-08-19 03:18:06 +0000 | [diff] [blame] | 1016 | /* Set basic environment. */ |
| 1017 | for (i = 0; i < s->num_env; i++) |
| 1018 | child_set_env(&env, &envsize, s->env[i].name, s->env[i].val); |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 1019 | |
djm@openbsd.org | 83b5818 | 2016-08-19 03:18:06 +0000 | [diff] [blame] | 1020 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
| 1021 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); |
Damien Miller | dfedbf8 | 2003-01-03 14:52:53 +1100 | [diff] [blame] | 1022 | #ifdef _AIX |
djm@openbsd.org | 83b5818 | 2016-08-19 03:18:06 +0000 | [diff] [blame] | 1023 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); |
Damien Miller | dfedbf8 | 2003-01-03 14:52:53 +1100 | [diff] [blame] | 1024 | #endif |
djm@openbsd.org | 83b5818 | 2016-08-19 03:18:06 +0000 | [diff] [blame] | 1025 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1026 | #ifdef HAVE_LOGIN_CAP |
djm@openbsd.org | 83b5818 | 2016-08-19 03:18:06 +0000 | [diff] [blame] | 1027 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
| 1028 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); |
| 1029 | else |
| 1030 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 1031 | #else /* HAVE_LOGIN_CAP */ |
| 1032 | # ifndef HAVE_CYGWIN |
djm@openbsd.org | 83b5818 | 2016-08-19 03:18:06 +0000 | [diff] [blame] | 1033 | /* |
| 1034 | * There's no standard path on Windows. The path contains |
| 1035 | * important components pointing to the system directories, |
| 1036 | * needed for loading shared libraries. So the path better |
| 1037 | * remains intact here. |
| 1038 | */ |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 1039 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
djm@openbsd.org | 83b5818 | 2016-08-19 03:18:06 +0000 | [diff] [blame] | 1040 | read_etc_default_login(&env, &envsize, pw->pw_uid); |
| 1041 | path = child_get_env(env, "PATH"); |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 1042 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ |
djm@openbsd.org | 83b5818 | 2016-08-19 03:18:06 +0000 | [diff] [blame] | 1043 | if (path == NULL || *path == '\0') { |
| 1044 | child_set_env(&env, &envsize, "PATH", |
| 1045 | s->pw->pw_uid == 0 ? SUPERUSER_PATH : _PATH_STDPATH); |
| 1046 | } |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 1047 | # endif /* HAVE_CYGWIN */ |
| 1048 | #endif /* HAVE_LOGIN_CAP */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1049 | |
djm@openbsd.org | 83b5818 | 2016-08-19 03:18:06 +0000 | [diff] [blame] | 1050 | snprintf(buf, sizeof buf, "%.200s/%.50s", _PATH_MAILDIR, pw->pw_name); |
| 1051 | child_set_env(&env, &envsize, "MAIL", buf); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1052 | |
djm@openbsd.org | 83b5818 | 2016-08-19 03:18:06 +0000 | [diff] [blame] | 1053 | /* Normal systems set SHELL by default. */ |
| 1054 | child_set_env(&env, &envsize, "SHELL", shell); |
| 1055 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1056 | if (getenv("TZ")) |
| 1057 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); |
| 1058 | |
| 1059 | /* Set custom environment options from RSA authentication. */ |
djm@openbsd.org | 83b5818 | 2016-08-19 03:18:06 +0000 | [diff] [blame] | 1060 | while (custom_environment) { |
| 1061 | struct envstring *ce = custom_environment; |
| 1062 | char *str = ce->s; |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1063 | |
djm@openbsd.org | 83b5818 | 2016-08-19 03:18:06 +0000 | [diff] [blame] | 1064 | for (i = 0; str[i] != '=' && str[i]; i++) |
| 1065 | ; |
| 1066 | if (str[i] == '=') { |
| 1067 | str[i] = 0; |
| 1068 | child_set_env(&env, &envsize, str, str + i + 1); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1069 | } |
djm@openbsd.org | 83b5818 | 2016-08-19 03:18:06 +0000 | [diff] [blame] | 1070 | custom_environment = ce->next; |
| 1071 | free(ce->s); |
| 1072 | free(ce); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1073 | } |
| 1074 | |
Damien Miller | f37e246 | 2002-09-19 11:47:55 +1000 | [diff] [blame] | 1075 | /* SSH_CLIENT deprecated */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1076 | snprintf(buf, sizeof buf, "%.50s %d %d", |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1077 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), |
| 1078 | ssh_local_port(ssh)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1079 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
| 1080 | |
Damien Miller | 0011138 | 2003-03-10 11:21:17 +1100 | [diff] [blame] | 1081 | laddr = get_local_ipaddr(packet_get_connection_in()); |
Damien Miller | f37e246 | 2002-09-19 11:47:55 +1000 | [diff] [blame] | 1082 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1083 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), |
| 1084 | laddr, ssh_local_port(ssh)); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1085 | free(laddr); |
Damien Miller | f37e246 | 2002-09-19 11:47:55 +1000 | [diff] [blame] | 1086 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
| 1087 | |
Ben Lindstrom | 86fe868 | 2001-03-17 00:32:57 +0000 | [diff] [blame] | 1088 | if (s->ttyfd != -1) |
| 1089 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); |
| 1090 | if (s->term) |
| 1091 | child_set_env(&env, &envsize, "TERM", s->term); |
| 1092 | if (s->display) |
| 1093 | child_set_env(&env, &envsize, "DISPLAY", s->display); |
Damien Miller | 7b28dc5 | 2000-09-05 13:34:53 +1100 | [diff] [blame] | 1094 | if (original_command) |
| 1095 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", |
| 1096 | original_command); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1097 | |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 1098 | #ifdef _UNICOS |
| 1099 | if (cray_tmpdir[0] != '\0') |
| 1100 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); |
| 1101 | #endif /* _UNICOS */ |
| 1102 | |
Darren Tucker | 9dc6c7d | 2005-02-02 18:30:33 +1100 | [diff] [blame] | 1103 | /* |
| 1104 | * Since we clear KRB5CCNAME at startup, if it's set now then it |
| 1105 | * must have been set by a native authentication method (eg AIX or |
| 1106 | * SIA), so copy it to the child. |
| 1107 | */ |
| 1108 | { |
| 1109 | char *cp; |
| 1110 | |
| 1111 | if ((cp = getenv("KRB5CCNAME")) != NULL) |
| 1112 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); |
| 1113 | } |
| 1114 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1115 | #ifdef _AIX |
Ben Lindstrom | 839ac4f | 2002-02-24 20:42:46 +0000 | [diff] [blame] | 1116 | { |
| 1117 | char *cp; |
| 1118 | |
| 1119 | if ((cp = getenv("AUTHSTATE")) != NULL) |
| 1120 | child_set_env(&env, &envsize, "AUTHSTATE", cp); |
Ben Lindstrom | 839ac4f | 2002-02-24 20:42:46 +0000 | [diff] [blame] | 1121 | read_environment_file(&env, &envsize, "/etc/environment"); |
| 1122 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1123 | #endif |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 1124 | #ifdef KRB5 |
Damien Miller | 9c870f9 | 2004-04-16 22:47:55 +1000 | [diff] [blame] | 1125 | if (s->authctxt->krb5_ccname) |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 1126 | child_set_env(&env, &envsize, "KRB5CCNAME", |
Damien Miller | 9c870f9 | 2004-04-16 22:47:55 +1000 | [diff] [blame] | 1127 | s->authctxt->krb5_ccname); |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 1128 | #endif |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1129 | #ifdef USE_PAM |
Kevin Steves | 38b050a | 2002-07-23 00:44:07 +0000 | [diff] [blame] | 1130 | /* |
| 1131 | * Pull in any environment variables that may have |
| 1132 | * been set by PAM. |
| 1133 | */ |
djm@openbsd.org | 83b5818 | 2016-08-19 03:18:06 +0000 | [diff] [blame] | 1134 | if (options.use_pam) { |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 1135 | char **p; |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 1136 | |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 1137 | p = fetch_pam_child_environment(); |
| 1138 | copy_environment(p, &env, &envsize); |
| 1139 | free_pam_environment(p); |
Kevin Steves | 38b050a | 2002-07-23 00:44:07 +0000 | [diff] [blame] | 1140 | |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 1141 | p = fetch_pam_environment(); |
Kevin Steves | 38b050a | 2002-07-23 00:44:07 +0000 | [diff] [blame] | 1142 | copy_environment(p, &env, &envsize); |
| 1143 | free_pam_environment(p); |
| 1144 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1145 | #endif /* USE_PAM */ |
| 1146 | |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 1147 | if (auth_sock_name != NULL) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1148 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 1149 | auth_sock_name); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1150 | |
| 1151 | /* read $HOME/.ssh/environment. */ |
djm@openbsd.org | 83b5818 | 2016-08-19 03:18:06 +0000 | [diff] [blame] | 1152 | if (options.permit_user_env) { |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 1153 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
Damien Miller | e9994cb | 2002-09-10 21:43:53 +1000 | [diff] [blame] | 1154 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1155 | read_environment_file(&env, &envsize, buf); |
| 1156 | } |
| 1157 | if (debug_flag) { |
| 1158 | /* dump the environment */ |
| 1159 | fprintf(stderr, "Environment:\n"); |
| 1160 | for (i = 0; env[i]; i++) |
| 1161 | fprintf(stderr, " %.200s\n", env[i]); |
| 1162 | } |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1163 | return env; |
| 1164 | } |
| 1165 | |
| 1166 | /* |
| 1167 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found |
| 1168 | * first in this order). |
| 1169 | */ |
| 1170 | static void |
| 1171 | do_rc_files(Session *s, const char *shell) |
| 1172 | { |
| 1173 | FILE *f = NULL; |
| 1174 | char cmd[1024]; |
| 1175 | int do_xauth; |
| 1176 | struct stat st; |
| 1177 | |
| 1178 | do_xauth = |
| 1179 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; |
| 1180 | |
Damien Miller | a1b48cc | 2008-03-27 11:02:02 +1100 | [diff] [blame] | 1181 | /* ignore _PATH_SSH_USER_RC for subsystems and admin forced commands */ |
Damien Miller | 55360e1 | 2008-03-27 11:02:27 +1100 | [diff] [blame] | 1182 | if (!s->is_subsystem && options.adm_forced_command == NULL && |
Damien Miller | 72e6b5c | 2014-07-04 09:00:04 +1000 | [diff] [blame] | 1183 | !no_user_rc && options.permit_user_rc && |
| 1184 | stat(_PATH_SSH_USER_RC, &st) >= 0) { |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1185 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", |
| 1186 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); |
| 1187 | if (debug_flag) |
| 1188 | fprintf(stderr, "Running %s\n", cmd); |
| 1189 | f = popen(cmd, "w"); |
| 1190 | if (f) { |
| 1191 | if (do_xauth) |
| 1192 | fprintf(f, "%s %s\n", s->auth_proto, |
| 1193 | s->auth_data); |
| 1194 | pclose(f); |
| 1195 | } else |
| 1196 | fprintf(stderr, "Could not run %s\n", |
| 1197 | _PATH_SSH_USER_RC); |
| 1198 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { |
| 1199 | if (debug_flag) |
| 1200 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, |
| 1201 | _PATH_SSH_SYSTEM_RC); |
| 1202 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); |
| 1203 | if (f) { |
| 1204 | if (do_xauth) |
| 1205 | fprintf(f, "%s %s\n", s->auth_proto, |
| 1206 | s->auth_data); |
| 1207 | pclose(f); |
| 1208 | } else |
| 1209 | fprintf(stderr, "Could not run %s\n", |
| 1210 | _PATH_SSH_SYSTEM_RC); |
| 1211 | } else if (do_xauth && options.xauth_location != NULL) { |
| 1212 | /* Add authority data to .Xauthority if appropriate. */ |
| 1213 | if (debug_flag) { |
| 1214 | fprintf(stderr, |
Ben Lindstrom | 611797e | 2002-12-23 02:15:57 +0000 | [diff] [blame] | 1215 | "Running %.500s remove %.100s\n", |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 1216 | options.xauth_location, s->auth_display); |
Ben Lindstrom | 611797e | 2002-12-23 02:15:57 +0000 | [diff] [blame] | 1217 | fprintf(stderr, |
| 1218 | "%.500s add %.100s %.100s %.100s\n", |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1219 | options.xauth_location, s->auth_display, |
| 1220 | s->auth_proto, s->auth_data); |
| 1221 | } |
| 1222 | snprintf(cmd, sizeof cmd, "%s -q -", |
| 1223 | options.xauth_location); |
| 1224 | f = popen(cmd, "w"); |
| 1225 | if (f) { |
Ben Lindstrom | 611797e | 2002-12-23 02:15:57 +0000 | [diff] [blame] | 1226 | fprintf(f, "remove %s\n", |
| 1227 | s->auth_display); |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1228 | fprintf(f, "add %s %s %s\n", |
| 1229 | s->auth_display, s->auth_proto, |
| 1230 | s->auth_data); |
| 1231 | pclose(f); |
| 1232 | } else { |
| 1233 | fprintf(stderr, "Could not run %s\n", |
| 1234 | cmd); |
| 1235 | } |
| 1236 | } |
| 1237 | } |
| 1238 | |
| 1239 | static void |
| 1240 | do_nologin(struct passwd *pw) |
| 1241 | { |
| 1242 | FILE *f = NULL; |
Darren Tucker | 09aa4c0 | 2010-01-12 19:51:48 +1100 | [diff] [blame] | 1243 | char buf[1024], *nl, *def_nl = _PATH_NOLOGIN; |
| 1244 | struct stat sb; |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1245 | |
| 1246 | #ifdef HAVE_LOGIN_CAP |
Damien Miller | 29cd188 | 2012-04-22 11:08:10 +1000 | [diff] [blame] | 1247 | if (login_getcapbool(lc, "ignorenologin", 0) || pw->pw_uid == 0) |
Darren Tucker | 09aa4c0 | 2010-01-12 19:51:48 +1100 | [diff] [blame] | 1248 | return; |
| 1249 | nl = login_getcapstr(lc, "nologin", def_nl, def_nl); |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1250 | #else |
Darren Tucker | 09aa4c0 | 2010-01-12 19:51:48 +1100 | [diff] [blame] | 1251 | if (pw->pw_uid == 0) |
| 1252 | return; |
| 1253 | nl = def_nl; |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1254 | #endif |
Darren Tucker | 09aa4c0 | 2010-01-12 19:51:48 +1100 | [diff] [blame] | 1255 | if (stat(nl, &sb) == -1) { |
| 1256 | if (nl != def_nl) |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1257 | free(nl); |
Darren Tucker | 09aa4c0 | 2010-01-12 19:51:48 +1100 | [diff] [blame] | 1258 | return; |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1259 | } |
Darren Tucker | 09aa4c0 | 2010-01-12 19:51:48 +1100 | [diff] [blame] | 1260 | |
| 1261 | /* /etc/nologin exists. Print its contents if we can and exit. */ |
| 1262 | logit("User %.100s not allowed because %s exists", pw->pw_name, nl); |
| 1263 | if ((f = fopen(nl, "r")) != NULL) { |
| 1264 | while (fgets(buf, sizeof(buf), f)) |
| 1265 | fputs(buf, stderr); |
| 1266 | fclose(f); |
| 1267 | } |
| 1268 | exit(254); |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1269 | } |
| 1270 | |
Damien Miller | d8cb1f1 | 2008-02-10 22:40:12 +1100 | [diff] [blame] | 1271 | /* |
| 1272 | * Chroot into a directory after checking it for safety: all path components |
| 1273 | * must be root-owned directories with strict permissions. |
| 1274 | */ |
| 1275 | static void |
| 1276 | safely_chroot(const char *path, uid_t uid) |
| 1277 | { |
| 1278 | const char *cp; |
deraadt@openbsd.org | 2ae4f33 | 2015-01-16 06:40:12 +0000 | [diff] [blame] | 1279 | char component[PATH_MAX]; |
Damien Miller | d8cb1f1 | 2008-02-10 22:40:12 +1100 | [diff] [blame] | 1280 | struct stat st; |
| 1281 | |
| 1282 | if (*path != '/') |
| 1283 | fatal("chroot path does not begin at root"); |
| 1284 | if (strlen(path) >= sizeof(component)) |
| 1285 | fatal("chroot path too long"); |
| 1286 | |
| 1287 | /* |
| 1288 | * Descend the path, checking that each component is a |
| 1289 | * root-owned directory with strict permissions. |
| 1290 | */ |
| 1291 | for (cp = path; cp != NULL;) { |
| 1292 | if ((cp = strchr(cp, '/')) == NULL) |
| 1293 | strlcpy(component, path, sizeof(component)); |
| 1294 | else { |
| 1295 | cp++; |
| 1296 | memcpy(component, path, cp - path); |
| 1297 | component[cp - path] = '\0'; |
| 1298 | } |
| 1299 | |
| 1300 | debug3("%s: checking '%s'", __func__, component); |
| 1301 | |
| 1302 | if (stat(component, &st) != 0) |
| 1303 | fatal("%s: stat(\"%s\"): %s", __func__, |
| 1304 | component, strerror(errno)); |
| 1305 | if (st.st_uid != 0 || (st.st_mode & 022) != 0) |
| 1306 | fatal("bad ownership or modes for chroot " |
| 1307 | "directory %s\"%s\"", |
| 1308 | cp == NULL ? "" : "component ", component); |
| 1309 | if (!S_ISDIR(st.st_mode)) |
| 1310 | fatal("chroot path %s\"%s\" is not a directory", |
| 1311 | cp == NULL ? "" : "component ", component); |
| 1312 | |
| 1313 | } |
| 1314 | |
| 1315 | if (chdir(path) == -1) |
| 1316 | fatal("Unable to chdir to chroot path \"%s\": " |
| 1317 | "%s", path, strerror(errno)); |
| 1318 | if (chroot(path) == -1) |
| 1319 | fatal("chroot(\"%s\"): %s", path, strerror(errno)); |
| 1320 | if (chdir("/") == -1) |
| 1321 | fatal("%s: chdir(/) after chroot: %s", |
| 1322 | __func__, strerror(errno)); |
| 1323 | verbose("Changed root directory to \"%s\"", path); |
| 1324 | } |
| 1325 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1326 | /* Set login name, uid, gid, and groups. */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1327 | void |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1328 | do_setusercontext(struct passwd *pw) |
| 1329 | { |
Damien Miller | 54e3773 | 2008-02-10 22:48:55 +1100 | [diff] [blame] | 1330 | char *chroot_path, *tmp; |
| 1331 | |
Darren Tucker | 9752835 | 2010-11-05 12:03:05 +1100 | [diff] [blame] | 1332 | platform_setusercontext(pw); |
| 1333 | |
Darren Tucker | b12fe27 | 2010-11-05 14:47:01 +1100 | [diff] [blame] | 1334 | if (platform_privileged_uidswap()) { |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1335 | #ifdef HAVE_LOGIN_CAP |
| 1336 | if (setusercontext(lc, pw, pw->pw_uid, |
Damien Miller | d8cb1f1 | 2008-02-10 22:40:12 +1100 | [diff] [blame] | 1337 | (LOGIN_SETALL & ~(LOGIN_SETPATH|LOGIN_SETUSER))) < 0) { |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1338 | perror("unable to set user context"); |
| 1339 | exit(1); |
| 1340 | } |
| 1341 | #else |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1342 | if (setlogin(pw->pw_name) < 0) |
| 1343 | error("setlogin failed: %s", strerror(errno)); |
| 1344 | if (setgid(pw->pw_gid) < 0) { |
| 1345 | perror("setgid"); |
| 1346 | exit(1); |
| 1347 | } |
| 1348 | /* Initialize the group list. */ |
| 1349 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { |
| 1350 | perror("initgroups"); |
| 1351 | exit(1); |
| 1352 | } |
| 1353 | endgrent(); |
Damien Miller | d8cb1f1 | 2008-02-10 22:40:12 +1100 | [diff] [blame] | 1354 | #endif |
| 1355 | |
Darren Tucker | 920612e | 2010-11-05 12:36:15 +1100 | [diff] [blame] | 1356 | platform_setusercontext_post_groups(pw); |
Damien Miller | 8b90642 | 2010-03-26 11:04:09 +1100 | [diff] [blame] | 1357 | |
djm@openbsd.org | 44fc7cd | 2015-10-24 22:52:22 +0000 | [diff] [blame] | 1358 | if (!in_chroot && options.chroot_directory != NULL && |
Damien Miller | d8cb1f1 | 2008-02-10 22:40:12 +1100 | [diff] [blame] | 1359 | strcasecmp(options.chroot_directory, "none") != 0) { |
Damien Miller | 54e3773 | 2008-02-10 22:48:55 +1100 | [diff] [blame] | 1360 | tmp = tilde_expand_filename(options.chroot_directory, |
| 1361 | pw->pw_uid); |
| 1362 | chroot_path = percent_expand(tmp, "h", pw->pw_dir, |
| 1363 | "u", pw->pw_name, (char *)NULL); |
Damien Miller | d8cb1f1 | 2008-02-10 22:40:12 +1100 | [diff] [blame] | 1364 | safely_chroot(chroot_path, pw->pw_uid); |
Damien Miller | 54e3773 | 2008-02-10 22:48:55 +1100 | [diff] [blame] | 1365 | free(tmp); |
Damien Miller | d8cb1f1 | 2008-02-10 22:40:12 +1100 | [diff] [blame] | 1366 | free(chroot_path); |
Damien Miller | a56086b | 2013-04-23 15:24:18 +1000 | [diff] [blame] | 1367 | /* Make sure we don't attempt to chroot again */ |
| 1368 | free(options.chroot_directory); |
| 1369 | options.chroot_directory = NULL; |
djm@openbsd.org | 44fc7cd | 2015-10-24 22:52:22 +0000 | [diff] [blame] | 1370 | in_chroot = 1; |
Damien Miller | d8cb1f1 | 2008-02-10 22:40:12 +1100 | [diff] [blame] | 1371 | } |
| 1372 | |
| 1373 | #ifdef HAVE_LOGIN_CAP |
| 1374 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETUSER) < 0) { |
| 1375 | perror("unable to set user context (setuser)"); |
| 1376 | exit(1); |
| 1377 | } |
Damien Miller | 5852840 | 2013-03-15 11:22:37 +1100 | [diff] [blame] | 1378 | /* |
| 1379 | * FreeBSD's setusercontext() will not apply the user's |
| 1380 | * own umask setting unless running with the user's UID. |
| 1381 | */ |
| 1382 | (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETUMASK); |
Damien Miller | d8cb1f1 | 2008-02-10 22:40:12 +1100 | [diff] [blame] | 1383 | #else |
Tim Rice | 9464ba6 | 2014-01-20 17:59:28 -0800 | [diff] [blame] | 1384 | # ifdef USE_LIBIAF |
djm@openbsd.org | 44fc7cd | 2015-10-24 22:52:22 +0000 | [diff] [blame] | 1385 | /* |
| 1386 | * In a chroot environment, the set_id() will always fail; |
| 1387 | * typically because of the lack of necessary authentication |
| 1388 | * services and runtime such as ./usr/lib/libiaf.so, |
| 1389 | * ./usr/lib/libpam.so.1, and ./etc/passwd We skip it in the |
| 1390 | * internal sftp chroot case. We'll lose auditing and ACLs but |
| 1391 | * permanently_set_uid will take care of the rest. |
| 1392 | */ |
| 1393 | if (!in_chroot && set_id(pw->pw_name) != 0) |
| 1394 | fatal("set_id(%s) Failed", pw->pw_name); |
Tim Rice | 9464ba6 | 2014-01-20 17:59:28 -0800 | [diff] [blame] | 1395 | # endif /* USE_LIBIAF */ |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1396 | /* Permanently switch to the desired uid. */ |
| 1397 | permanently_set_uid(pw); |
| 1398 | #endif |
Damien Miller | a56086b | 2013-04-23 15:24:18 +1000 | [diff] [blame] | 1399 | } else if (options.chroot_directory != NULL && |
| 1400 | strcasecmp(options.chroot_directory, "none") != 0) { |
| 1401 | fatal("server lacks privileges to chroot to ChrootDirectory"); |
Damien Miller | f1a02ae | 2013-04-23 15:22:13 +1000 | [diff] [blame] | 1402 | } |
Damien Miller | 1a3ccb0 | 2003-02-24 13:04:01 +1100 | [diff] [blame] | 1403 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1404 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
| 1405 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); |
| 1406 | } |
| 1407 | |
Ben Lindstrom | 0810519 | 2002-03-22 02:50:06 +0000 | [diff] [blame] | 1408 | static void |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1409 | do_pwchange(Session *s) |
| 1410 | { |
Darren Tucker | 0999174 | 2004-07-17 17:05:14 +1000 | [diff] [blame] | 1411 | fflush(NULL); |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1412 | fprintf(stderr, "WARNING: Your password has expired.\n"); |
| 1413 | if (s->ttyfd != -1) { |
Darren Tucker | fc95970 | 2004-07-17 16:12:08 +1000 | [diff] [blame] | 1414 | fprintf(stderr, |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1415 | "You must change your password now and login again!\n"); |
Damien Miller | 14684a1 | 2011-05-20 11:23:07 +1000 | [diff] [blame] | 1416 | #ifdef WITH_SELINUX |
| 1417 | setexeccon(NULL); |
| 1418 | #endif |
Darren Tucker | 33370e0 | 2005-02-09 22:17:28 +1100 | [diff] [blame] | 1419 | #ifdef PASSWD_NEEDS_USERNAME |
| 1420 | execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name, |
| 1421 | (char *)NULL); |
| 1422 | #else |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1423 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); |
Darren Tucker | 33370e0 | 2005-02-09 22:17:28 +1100 | [diff] [blame] | 1424 | #endif |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1425 | perror("passwd"); |
| 1426 | } else { |
| 1427 | fprintf(stderr, |
| 1428 | "Password change required but no TTY available.\n"); |
| 1429 | } |
| 1430 | exit(1); |
| 1431 | } |
| 1432 | |
| 1433 | static void |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1434 | child_close_fds(void) |
| 1435 | { |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1436 | extern int auth_sock; |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 1437 | |
djm@openbsd.org | 141efe4 | 2015-01-14 20:05:27 +0000 | [diff] [blame] | 1438 | if (auth_sock != -1) { |
| 1439 | close(auth_sock); |
| 1440 | auth_sock = -1; |
Damien Miller | 85b45e0 | 2013-07-20 13:21:52 +1000 | [diff] [blame] | 1441 | } |
| 1442 | |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1443 | if (packet_get_connection_in() == packet_get_connection_out()) |
| 1444 | close(packet_get_connection_in()); |
| 1445 | else { |
| 1446 | close(packet_get_connection_in()); |
| 1447 | close(packet_get_connection_out()); |
| 1448 | } |
| 1449 | /* |
| 1450 | * Close all descriptors related to channels. They will still remain |
| 1451 | * open in the parent. |
| 1452 | */ |
| 1453 | /* XXX better use close-on-exec? -markus */ |
| 1454 | channel_close_all(); |
| 1455 | |
| 1456 | /* |
| 1457 | * Close any extra file descriptors. Note that there may still be |
| 1458 | * descriptors left by system functions. They will be closed later. |
| 1459 | */ |
| 1460 | endpwent(); |
| 1461 | |
| 1462 | /* |
Damien Miller | 788f212 | 2005-11-05 15:14:59 +1100 | [diff] [blame] | 1463 | * Close any extra open file descriptors so that we don't have them |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1464 | * hanging around in clients. Note that we want to do this after |
| 1465 | * initgroups, because at least on Solaris 2.3 it leaves file |
| 1466 | * descriptors open. |
| 1467 | */ |
Damien Miller | f80c3de | 2010-12-01 12:02:59 +1100 | [diff] [blame] | 1468 | closefrom(STDERR_FILENO + 1); |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1469 | } |
| 1470 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1471 | /* |
| 1472 | * Performs common processing for the child, such as setting up the |
| 1473 | * environment, closing extra file descriptors, setting the user and group |
| 1474 | * ids, and executing the command or shell. |
| 1475 | */ |
Damien Miller | dfc2425 | 2008-02-10 22:29:40 +1100 | [diff] [blame] | 1476 | #define ARGV_MAX 10 |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1477 | void |
| 1478 | do_child(Session *s, const char *command) |
| 1479 | { |
| 1480 | extern char **environ; |
| 1481 | char **env; |
Damien Miller | dfc2425 | 2008-02-10 22:29:40 +1100 | [diff] [blame] | 1482 | char *argv[ARGV_MAX]; |
djm@openbsd.org | 83b5818 | 2016-08-19 03:18:06 +0000 | [diff] [blame] | 1483 | const char *shell, *shell0; |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1484 | struct passwd *pw = s->pw; |
Damien Miller | 6051c94 | 2008-06-16 07:53:16 +1000 | [diff] [blame] | 1485 | int r = 0; |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1486 | |
| 1487 | /* remove hostkey from the child's memory */ |
| 1488 | destroy_sensitive_data(); |
markus@openbsd.org | 1e0cdf8 | 2017-05-31 08:09:45 +0000 | [diff] [blame] | 1489 | packet_clear_keys(); |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1490 | |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1491 | /* Force a password change */ |
| 1492 | if (s->authctxt->force_pwchange) { |
| 1493 | do_setusercontext(pw); |
| 1494 | child_close_fds(); |
| 1495 | do_pwchange(s); |
| 1496 | exit(1); |
| 1497 | } |
| 1498 | |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 1499 | #ifdef _UNICOS |
| 1500 | cray_setup(pw->pw_uid, pw->pw_name, command); |
| 1501 | #endif /* _UNICOS */ |
| 1502 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1503 | /* |
| 1504 | * Login(1) does this as well, and it needs uid 0 for the "-h" |
| 1505 | * switch, so we let login(1) to this for us. |
| 1506 | */ |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1507 | #ifdef HAVE_OSF_SIA |
djm@openbsd.org | 83b5818 | 2016-08-19 03:18:06 +0000 | [diff] [blame] | 1508 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
| 1509 | if (!check_quietlogin(s, command)) |
| 1510 | do_motd(); |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1511 | #else /* HAVE_OSF_SIA */ |
djm@openbsd.org | 83b5818 | 2016-08-19 03:18:06 +0000 | [diff] [blame] | 1512 | /* When PAM is enabled we rely on it to do the nologin check */ |
| 1513 | if (!options.use_pam) |
| 1514 | do_nologin(pw); |
| 1515 | do_setusercontext(pw); |
| 1516 | /* |
| 1517 | * PAM session modules in do_setusercontext may have |
| 1518 | * generated messages, so if this in an interactive |
| 1519 | * login then display them too. |
| 1520 | */ |
| 1521 | if (!check_quietlogin(s, command)) |
| 1522 | display_loginmsg(); |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1523 | #endif /* HAVE_OSF_SIA */ |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1524 | |
Darren Tucker | 69687f4 | 2004-09-11 22:17:26 +1000 | [diff] [blame] | 1525 | #ifdef USE_PAM |
djm@openbsd.org | 83b5818 | 2016-08-19 03:18:06 +0000 | [diff] [blame] | 1526 | if (options.use_pam && !is_pam_session_open()) { |
Darren Tucker | 4855415 | 2005-04-21 19:50:55 +1000 | [diff] [blame] | 1527 | debug3("PAM session not opened, exiting"); |
Darren Tucker | 69687f4 | 2004-09-11 22:17:26 +1000 | [diff] [blame] | 1528 | display_loginmsg(); |
| 1529 | exit(254); |
| 1530 | } |
| 1531 | #endif |
| 1532 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1533 | /* |
| 1534 | * Get the shell from the password data. An empty shell field is |
| 1535 | * legal, and means /bin/sh. |
| 1536 | */ |
| 1537 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; |
Ben Lindstrom | 4676760 | 2002-12-23 02:26:08 +0000 | [diff] [blame] | 1538 | |
| 1539 | /* |
| 1540 | * Make sure $SHELL points to the shell from the password file, |
| 1541 | * even if shell is overridden from login.conf |
| 1542 | */ |
| 1543 | env = do_setup_env(s, shell); |
| 1544 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1545 | #ifdef HAVE_LOGIN_CAP |
| 1546 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); |
| 1547 | #endif |
| 1548 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1549 | /* |
| 1550 | * Close the connection descriptors; note that this is the child, and |
| 1551 | * the server will still have the socket open, and it is important |
| 1552 | * that we do not shutdown it. Note that the descriptors cannot be |
| 1553 | * closed before building the environment, as we call |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 1554 | * ssh_remote_ipaddr there. |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1555 | */ |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1556 | child_close_fds(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1557 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1558 | /* |
Damien Miller | 05eda43 | 2002-02-10 18:32:28 +1100 | [diff] [blame] | 1559 | * Must take new environment into use so that .ssh/rc, |
| 1560 | * /etc/ssh/sshrc and xauth are run in the proper environment. |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1561 | */ |
| 1562 | environ = env; |
| 1563 | |
Darren Tucker | 3c78c5e | 2004-01-23 22:03:10 +1100 | [diff] [blame] | 1564 | #if defined(KRB5) && defined(USE_AFS) |
Darren Tucker | 22ef508 | 2003-12-31 11:37:34 +1100 | [diff] [blame] | 1565 | /* |
| 1566 | * At this point, we check to see if AFS is active and if we have |
| 1567 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see |
| 1568 | * if we can (and need to) extend the ticket into an AFS token. If |
| 1569 | * we don't do this, we run into potential problems if the user's |
| 1570 | * home directory is in AFS and it's not world-readable. |
| 1571 | */ |
| 1572 | |
| 1573 | if (options.kerberos_get_afs_token && k_hasafs() && |
Damien Miller | 0dc1bef | 2005-07-17 17:22:45 +1000 | [diff] [blame] | 1574 | (s->authctxt->krb5_ctx != NULL)) { |
Darren Tucker | 22ef508 | 2003-12-31 11:37:34 +1100 | [diff] [blame] | 1575 | char cell[64]; |
| 1576 | |
| 1577 | debug("Getting AFS token"); |
| 1578 | |
| 1579 | k_setpag(); |
| 1580 | |
| 1581 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) |
| 1582 | krb5_afslog(s->authctxt->krb5_ctx, |
| 1583 | s->authctxt->krb5_fwd_ccache, cell, NULL); |
| 1584 | |
| 1585 | krb5_afslog_home(s->authctxt->krb5_ctx, |
| 1586 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); |
| 1587 | } |
| 1588 | #endif |
| 1589 | |
Damien Miller | 788f212 | 2005-11-05 15:14:59 +1100 | [diff] [blame] | 1590 | /* Change current directory to the user's home directory. */ |
Damien Miller | 139d4cd | 2001-10-10 15:07:44 +1000 | [diff] [blame] | 1591 | if (chdir(pw->pw_dir) < 0) { |
Damien Miller | 6051c94 | 2008-06-16 07:53:16 +1000 | [diff] [blame] | 1592 | /* Suppress missing homedir warning for chroot case */ |
Damien Miller | 139d4cd | 2001-10-10 15:07:44 +1000 | [diff] [blame] | 1593 | #ifdef HAVE_LOGIN_CAP |
Damien Miller | 6051c94 | 2008-06-16 07:53:16 +1000 | [diff] [blame] | 1594 | r = login_getcapbool(lc, "requirehome", 0); |
Damien Miller | 139d4cd | 2001-10-10 15:07:44 +1000 | [diff] [blame] | 1595 | #endif |
djm@openbsd.org | 44fc7cd | 2015-10-24 22:52:22 +0000 | [diff] [blame] | 1596 | if (r || !in_chroot) { |
Damien Miller | 6051c94 | 2008-06-16 07:53:16 +1000 | [diff] [blame] | 1597 | fprintf(stderr, "Could not chdir to home " |
| 1598 | "directory %s: %s\n", pw->pw_dir, |
| 1599 | strerror(errno)); |
djm@openbsd.org | 44fc7cd | 2015-10-24 22:52:22 +0000 | [diff] [blame] | 1600 | } |
Damien Miller | 6051c94 | 2008-06-16 07:53:16 +1000 | [diff] [blame] | 1601 | if (r) |
| 1602 | exit(1); |
Damien Miller | 139d4cd | 2001-10-10 15:07:44 +1000 | [diff] [blame] | 1603 | } |
| 1604 | |
Damien Miller | a193900 | 2008-03-15 17:27:58 +1100 | [diff] [blame] | 1605 | closefrom(STDERR_FILENO + 1); |
| 1606 | |
djm@openbsd.org | 83b5818 | 2016-08-19 03:18:06 +0000 | [diff] [blame] | 1607 | do_rc_files(s, shell); |
Ben Lindstrom | de71cda | 2001-03-24 00:43:26 +0000 | [diff] [blame] | 1608 | |
| 1609 | /* restore SIGPIPE for child */ |
Damien Miller | 9ab00b4 | 2006-08-05 12:40:11 +1000 | [diff] [blame] | 1610 | signal(SIGPIPE, SIG_DFL); |
Ben Lindstrom | de71cda | 2001-03-24 00:43:26 +0000 | [diff] [blame] | 1611 | |
Darren Tucker | d6b06a9 | 2010-01-08 17:09:11 +1100 | [diff] [blame] | 1612 | if (s->is_subsystem == SUBSYSTEM_INT_SFTP_ERROR) { |
| 1613 | printf("This service allows sftp connections only.\n"); |
| 1614 | fflush(NULL); |
| 1615 | exit(1); |
| 1616 | } else if (s->is_subsystem == SUBSYSTEM_INT_SFTP) { |
Damien Miller | dfc2425 | 2008-02-10 22:29:40 +1100 | [diff] [blame] | 1617 | extern int optind, optreset; |
| 1618 | int i; |
| 1619 | char *p, *args; |
| 1620 | |
Darren Tucker | ac46a91 | 2009-06-21 17:55:23 +1000 | [diff] [blame] | 1621 | setproctitle("%s@%s", s->pw->pw_name, INTERNAL_SFTP_NAME); |
Damien Miller | d58f560 | 2008-11-03 19:20:49 +1100 | [diff] [blame] | 1622 | args = xstrdup(command ? command : "sftp-server"); |
Damien Miller | dfc2425 | 2008-02-10 22:29:40 +1100 | [diff] [blame] | 1623 | for (i = 0, (p = strtok(args, " ")); p; (p = strtok(NULL, " "))) |
| 1624 | if (i < ARGV_MAX - 1) |
| 1625 | argv[i++] = p; |
| 1626 | argv[i] = NULL; |
| 1627 | optind = optreset = 1; |
| 1628 | __progname = argv[0]; |
Darren Tucker | 4d6656b | 2009-10-24 15:04:12 +1100 | [diff] [blame] | 1629 | #ifdef WITH_SELINUX |
| 1630 | ssh_selinux_change_context("sftpd_t"); |
| 1631 | #endif |
Damien Miller | d8cb1f1 | 2008-02-10 22:40:12 +1100 | [diff] [blame] | 1632 | exit(sftp_server_main(i, argv, s->pw)); |
Damien Miller | dfc2425 | 2008-02-10 22:29:40 +1100 | [diff] [blame] | 1633 | } |
| 1634 | |
Darren Tucker | 695ed39 | 2009-10-07 09:02:18 +1100 | [diff] [blame] | 1635 | fflush(NULL); |
| 1636 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1637 | /* Get the last component of the shell name. */ |
| 1638 | if ((shell0 = strrchr(shell, '/')) != NULL) |
| 1639 | shell0++; |
| 1640 | else |
| 1641 | shell0 = shell; |
| 1642 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1643 | /* |
| 1644 | * If we have no command, execute the shell. In this case, the shell |
| 1645 | * name to be passed in argv[0] is preceded by '-' to indicate that |
| 1646 | * this is a login shell. |
| 1647 | */ |
| 1648 | if (!command) { |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1649 | char argv0[256]; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1650 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1651 | /* Start the shell. Set initial character to '-'. */ |
| 1652 | argv0[0] = '-'; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1653 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1654 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
| 1655 | >= sizeof(argv0) - 1) { |
| 1656 | errno = EINVAL; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1657 | perror(shell); |
| 1658 | exit(1); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1659 | } |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1660 | |
| 1661 | /* Execute the shell. */ |
| 1662 | argv[0] = argv0; |
| 1663 | argv[1] = NULL; |
| 1664 | execve(shell, argv, env); |
| 1665 | |
| 1666 | /* Executing the shell failed. */ |
| 1667 | perror(shell); |
| 1668 | exit(1); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1669 | } |
| 1670 | /* |
| 1671 | * Execute the command using the user's shell. This uses the -c |
| 1672 | * option to execute the command. |
| 1673 | */ |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1674 | argv[0] = (char *) shell0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1675 | argv[1] = "-c"; |
| 1676 | argv[2] = (char *) command; |
| 1677 | argv[3] = NULL; |
| 1678 | execve(shell, argv, env); |
| 1679 | perror(shell); |
| 1680 | exit(1); |
| 1681 | } |
| 1682 | |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 1683 | void |
| 1684 | session_unused(int id) |
| 1685 | { |
| 1686 | debug3("%s: session id %d unused", __func__, id); |
| 1687 | if (id >= options.max_sessions || |
| 1688 | id >= sessions_nalloc) { |
| 1689 | fatal("%s: insane session id %d (max %d nalloc %d)", |
| 1690 | __func__, id, options.max_sessions, sessions_nalloc); |
| 1691 | } |
Damien Miller | 1d2c456 | 2014-02-04 11:18:20 +1100 | [diff] [blame] | 1692 | memset(&sessions[id], 0, sizeof(*sessions)); |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 1693 | sessions[id].self = id; |
| 1694 | sessions[id].used = 0; |
| 1695 | sessions[id].chanid = -1; |
| 1696 | sessions[id].ptyfd = -1; |
| 1697 | sessions[id].ttyfd = -1; |
| 1698 | sessions[id].ptymaster = -1; |
| 1699 | sessions[id].x11_chanids = NULL; |
| 1700 | sessions[id].next_unused = sessions_first_unused; |
| 1701 | sessions_first_unused = id; |
| 1702 | } |
| 1703 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1704 | Session * |
| 1705 | session_new(void) |
| 1706 | { |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 1707 | Session *s, *tmp; |
| 1708 | |
| 1709 | if (sessions_first_unused == -1) { |
| 1710 | if (sessions_nalloc >= options.max_sessions) |
| 1711 | return NULL; |
| 1712 | debug2("%s: allocate (allocated %d max %d)", |
| 1713 | __func__, sessions_nalloc, options.max_sessions); |
deraadt@openbsd.org | 9e509d4 | 2017-05-31 09:15:42 +0000 | [diff] [blame] | 1714 | tmp = xrecallocarray(sessions, sessions_nalloc, |
| 1715 | sessions_nalloc + 1, sizeof(*sessions)); |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 1716 | if (tmp == NULL) { |
| 1717 | error("%s: cannot allocate %d sessions", |
| 1718 | __func__, sessions_nalloc + 1); |
| 1719 | return NULL; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1720 | } |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 1721 | sessions = tmp; |
| 1722 | session_unused(sessions_nalloc++); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1723 | } |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 1724 | |
| 1725 | if (sessions_first_unused >= sessions_nalloc || |
| 1726 | sessions_first_unused < 0) { |
| 1727 | fatal("%s: insane first_unused %d max %d nalloc %d", |
| 1728 | __func__, sessions_first_unused, options.max_sessions, |
| 1729 | sessions_nalloc); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1730 | } |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 1731 | |
| 1732 | s = &sessions[sessions_first_unused]; |
| 1733 | if (s->used) { |
| 1734 | fatal("%s: session %d already used", |
| 1735 | __func__, sessions_first_unused); |
| 1736 | } |
| 1737 | sessions_first_unused = s->next_unused; |
| 1738 | s->used = 1; |
| 1739 | s->next_unused = -1; |
| 1740 | debug("session_new: session %d", s->self); |
| 1741 | |
| 1742 | return s; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1743 | } |
| 1744 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1745 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1746 | session_dump(void) |
| 1747 | { |
| 1748 | int i; |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 1749 | for (i = 0; i < sessions_nalloc; i++) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1750 | Session *s = &sessions[i]; |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 1751 | |
| 1752 | debug("dump: used %d next_unused %d session %d %p " |
| 1753 | "channel %d pid %ld", |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1754 | s->used, |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 1755 | s->next_unused, |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1756 | s->self, |
| 1757 | s, |
| 1758 | s->chanid, |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 1759 | (long)s->pid); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1760 | } |
| 1761 | } |
| 1762 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1763 | int |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 1764 | session_open(Authctxt *authctxt, int chanid) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1765 | { |
| 1766 | Session *s = session_new(); |
| 1767 | debug("session_open: channel %d", chanid); |
| 1768 | if (s == NULL) { |
| 1769 | error("no more sessions"); |
| 1770 | return 0; |
| 1771 | } |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 1772 | s->authctxt = authctxt; |
| 1773 | s->pw = authctxt->pw; |
Damien Miller | 3e3b514 | 2003-11-17 21:13:40 +1100 | [diff] [blame] | 1774 | if (s->pw == NULL || !authctxt->valid) |
Kevin Steves | 43cdef3 | 2001-02-11 14:12:08 +0000 | [diff] [blame] | 1775 | fatal("no user for session %d", s->self); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1776 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
| 1777 | s->chanid = chanid; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1778 | return 1; |
| 1779 | } |
| 1780 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1781 | Session * |
| 1782 | session_by_tty(char *tty) |
| 1783 | { |
| 1784 | int i; |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 1785 | for (i = 0; i < sessions_nalloc; i++) { |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1786 | Session *s = &sessions[i]; |
| 1787 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { |
| 1788 | debug("session_by_tty: session %d tty %s", i, tty); |
| 1789 | return s; |
| 1790 | } |
| 1791 | } |
| 1792 | debug("session_by_tty: unknown tty %.100s", tty); |
| 1793 | session_dump(); |
| 1794 | return NULL; |
| 1795 | } |
| 1796 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1797 | static Session * |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1798 | session_by_channel(int id) |
| 1799 | { |
| 1800 | int i; |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 1801 | for (i = 0; i < sessions_nalloc; i++) { |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1802 | Session *s = &sessions[i]; |
| 1803 | if (s->used && s->chanid == id) { |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 1804 | debug("session_by_channel: session %d channel %d", |
| 1805 | i, id); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1806 | return s; |
| 1807 | } |
| 1808 | } |
| 1809 | debug("session_by_channel: unknown channel %d", id); |
| 1810 | session_dump(); |
| 1811 | return NULL; |
| 1812 | } |
| 1813 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1814 | static Session * |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 1815 | session_by_x11_channel(int id) |
| 1816 | { |
| 1817 | int i, j; |
| 1818 | |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 1819 | for (i = 0; i < sessions_nalloc; i++) { |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 1820 | Session *s = &sessions[i]; |
| 1821 | |
| 1822 | if (s->x11_chanids == NULL || !s->used) |
| 1823 | continue; |
| 1824 | for (j = 0; s->x11_chanids[j] != -1; j++) { |
| 1825 | if (s->x11_chanids[j] == id) { |
| 1826 | debug("session_by_x11_channel: session %d " |
| 1827 | "channel %d", s->self, id); |
| 1828 | return s; |
| 1829 | } |
| 1830 | } |
| 1831 | } |
| 1832 | debug("session_by_x11_channel: unknown channel %d", id); |
| 1833 | session_dump(); |
| 1834 | return NULL; |
| 1835 | } |
| 1836 | |
| 1837 | static Session * |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1838 | session_by_pid(pid_t pid) |
| 1839 | { |
| 1840 | int i; |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 1841 | debug("session_by_pid: pid %ld", (long)pid); |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 1842 | for (i = 0; i < sessions_nalloc; i++) { |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1843 | Session *s = &sessions[i]; |
| 1844 | if (s->used && s->pid == pid) |
| 1845 | return s; |
| 1846 | } |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 1847 | error("session_by_pid: unknown pid %ld", (long)pid); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1848 | session_dump(); |
| 1849 | return NULL; |
| 1850 | } |
| 1851 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1852 | static int |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1853 | session_window_change_req(Session *s) |
| 1854 | { |
| 1855 | s->col = packet_get_int(); |
| 1856 | s->row = packet_get_int(); |
| 1857 | s->xpixel = packet_get_int(); |
| 1858 | s->ypixel = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1859 | packet_check_eom(); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1860 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
| 1861 | return 1; |
| 1862 | } |
| 1863 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1864 | static int |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1865 | session_pty_req(Session *s) |
| 1866 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1867 | u_int len; |
Ben Lindstrom | ae8e2d3 | 2001-04-14 23:13:02 +0000 | [diff] [blame] | 1868 | int n_bytes; |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 1869 | |
Damien Miller | 5ff30c6 | 2013-10-30 22:21:50 +1100 | [diff] [blame] | 1870 | if (no_pty_flag || !options.permit_tty) { |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1871 | debug("Allocating a pty not permitted for this authentication."); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1872 | return 0; |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1873 | } |
| 1874 | if (s->ttyfd != -1) { |
| 1875 | packet_disconnect("Protocol error: you already have a pty."); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1876 | return 0; |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1877 | } |
| 1878 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1879 | s->term = packet_get_string(&len); |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 1880 | s->col = packet_get_int(); |
| 1881 | s->row = packet_get_int(); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1882 | s->xpixel = packet_get_int(); |
| 1883 | s->ypixel = packet_get_int(); |
| 1884 | |
| 1885 | if (strcmp(s->term, "") == 0) { |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1886 | free(s->term); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1887 | s->term = NULL; |
| 1888 | } |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1889 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1890 | /* Allocate a pty and open it. */ |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1891 | debug("Allocating pty."); |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 1892 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, |
| 1893 | sizeof(s->tty)))) { |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1894 | free(s->term); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1895 | s->term = NULL; |
| 1896 | s->ptyfd = -1; |
| 1897 | s->ttyfd = -1; |
| 1898 | error("session_pty_req: session %d alloc failed", s->self); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1899 | return 0; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1900 | } |
| 1901 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1902 | |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 1903 | n_bytes = packet_remaining(); |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1904 | tty_parse_modes(s->ttyfd, &n_bytes); |
| 1905 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1906 | if (!use_privsep) |
| 1907 | pty_setowner(s->pw, s->tty); |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1908 | |
| 1909 | /* Set window size from the packet. */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1910 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
| 1911 | |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1912 | packet_check_eom(); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 1913 | session_proctitle(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1914 | return 1; |
| 1915 | } |
| 1916 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1917 | static int |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1918 | session_subsystem_req(Session *s) |
| 1919 | { |
Damien Miller | ae45246 | 2001-10-10 15:08:06 +1000 | [diff] [blame] | 1920 | struct stat st; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1921 | u_int len; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1922 | int success = 0; |
Damien Miller | 71df752 | 2013-10-15 12:12:02 +1100 | [diff] [blame] | 1923 | char *prog, *cmd; |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 1924 | u_int i; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1925 | |
Damien Miller | 71df752 | 2013-10-15 12:12:02 +1100 | [diff] [blame] | 1926 | s->subsys = packet_get_string(&len); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1927 | packet_check_eom(); |
Damien Miller | 71df752 | 2013-10-15 12:12:02 +1100 | [diff] [blame] | 1928 | debug2("subsystem request for %.100s by user %s", s->subsys, |
Damien Miller | 1b2b61e | 2010-06-26 09:47:43 +1000 | [diff] [blame] | 1929 | s->pw->pw_name); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1930 | |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1931 | for (i = 0; i < options.num_subsystems; i++) { |
Damien Miller | 71df752 | 2013-10-15 12:12:02 +1100 | [diff] [blame] | 1932 | if (strcmp(s->subsys, options.subsystem_name[i]) == 0) { |
Damien Miller | 917f9b6 | 2006-07-10 20:36:47 +1000 | [diff] [blame] | 1933 | prog = options.subsystem_command[i]; |
| 1934 | cmd = options.subsystem_args[i]; |
Darren Tucker | c3dc404 | 2010-01-08 17:09:50 +1100 | [diff] [blame] | 1935 | if (strcmp(INTERNAL_SFTP_NAME, prog) == 0) { |
Damien Miller | dfc2425 | 2008-02-10 22:29:40 +1100 | [diff] [blame] | 1936 | s->is_subsystem = SUBSYSTEM_INT_SFTP; |
Darren Tucker | c3dc404 | 2010-01-08 17:09:50 +1100 | [diff] [blame] | 1937 | debug("subsystem: %s", prog); |
Damien Miller | dfc2425 | 2008-02-10 22:29:40 +1100 | [diff] [blame] | 1938 | } else { |
Darren Tucker | c3dc404 | 2010-01-08 17:09:50 +1100 | [diff] [blame] | 1939 | if (stat(prog, &st) < 0) |
| 1940 | debug("subsystem: cannot stat %s: %s", |
| 1941 | prog, strerror(errno)); |
Damien Miller | dfc2425 | 2008-02-10 22:29:40 +1100 | [diff] [blame] | 1942 | s->is_subsystem = SUBSYSTEM_EXT; |
Darren Tucker | c3dc404 | 2010-01-08 17:09:50 +1100 | [diff] [blame] | 1943 | debug("subsystem: exec() %s", cmd); |
Damien Miller | ae45246 | 2001-10-10 15:08:06 +1000 | [diff] [blame] | 1944 | } |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 1945 | success = do_exec(s, cmd) == 0; |
Damien Miller | 5fab4b9 | 2002-02-05 12:15:07 +1100 | [diff] [blame] | 1946 | break; |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1947 | } |
| 1948 | } |
| 1949 | |
| 1950 | if (!success) |
Damien Miller | 71df752 | 2013-10-15 12:12:02 +1100 | [diff] [blame] | 1951 | logit("subsystem request for %.100s by user %s failed, " |
| 1952 | "subsystem not found", s->subsys, s->pw->pw_name); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1953 | |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1954 | return success; |
| 1955 | } |
| 1956 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1957 | static int |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1958 | session_x11_req(Session *s) |
| 1959 | { |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 1960 | int success; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1961 | |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 1962 | if (s->auth_proto != NULL || s->auth_data != NULL) { |
| 1963 | error("session_x11_req: session %d: " |
Darren Tucker | 6355187 | 2005-12-20 16:14:15 +1100 | [diff] [blame] | 1964 | "x11 forwarding already active", s->self); |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 1965 | return 0; |
| 1966 | } |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1967 | s->single_connection = packet_get_char(); |
| 1968 | s->auth_proto = packet_get_string(NULL); |
| 1969 | s->auth_data = packet_get_string(NULL); |
| 1970 | s->screen = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1971 | packet_check_eom(); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1972 | |
djm@openbsd.org | 4b4bfb0 | 2016-03-10 11:47:57 +0000 | [diff] [blame] | 1973 | if (xauth_valid_string(s->auth_proto) && |
| 1974 | xauth_valid_string(s->auth_data)) |
| 1975 | success = session_setup_x11fwd(s); |
| 1976 | else { |
| 1977 | success = 0; |
| 1978 | error("Invalid X11 forwarding data"); |
| 1979 | } |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 1980 | if (!success) { |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1981 | free(s->auth_proto); |
| 1982 | free(s->auth_data); |
Ben Lindstrom | 88259fb | 2001-06-12 00:21:34 +0000 | [diff] [blame] | 1983 | s->auth_proto = NULL; |
| 1984 | s->auth_data = NULL; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1985 | } |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 1986 | return success; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1987 | } |
| 1988 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1989 | static int |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1990 | session_shell_req(Session *s) |
| 1991 | { |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1992 | packet_check_eom(); |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 1993 | return do_exec(s, NULL) == 0; |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1994 | } |
| 1995 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1996 | static int |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1997 | session_exec_req(Session *s) |
| 1998 | { |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 1999 | u_int len, success; |
| 2000 | |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 2001 | char *command = packet_get_string(&len); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2002 | packet_check_eom(); |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 2003 | success = do_exec(s, command) == 0; |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2004 | free(command); |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 2005 | return success; |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 2006 | } |
| 2007 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2008 | static int |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 2009 | session_break_req(Session *s) |
| 2010 | { |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 2011 | |
Darren Tucker | 1f8311c | 2004-05-13 16:39:33 +1000 | [diff] [blame] | 2012 | packet_get_int(); /* ignored */ |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 2013 | packet_check_eom(); |
| 2014 | |
Darren Tucker | 9c5d553 | 2011-11-04 10:55:24 +1100 | [diff] [blame] | 2015 | if (s->ptymaster == -1 || tcsendbreak(s->ptymaster, 0) < 0) |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 2016 | return 0; |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 2017 | return 1; |
| 2018 | } |
| 2019 | |
| 2020 | static int |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 2021 | session_env_req(Session *s) |
| 2022 | { |
| 2023 | char *name, *val; |
| 2024 | u_int name_len, val_len, i; |
| 2025 | |
Damien Miller | 8569eba | 2014-03-04 09:35:17 +1100 | [diff] [blame] | 2026 | name = packet_get_cstring(&name_len); |
| 2027 | val = packet_get_cstring(&val_len); |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 2028 | packet_check_eom(); |
| 2029 | |
| 2030 | /* Don't set too many environment variables */ |
| 2031 | if (s->num_env > 128) { |
| 2032 | debug2("Ignoring env request %s: too many env vars", name); |
| 2033 | goto fail; |
| 2034 | } |
| 2035 | |
| 2036 | for (i = 0; i < options.num_accept_env; i++) { |
| 2037 | if (match_pattern(name, options.accept_env[i])) { |
| 2038 | debug2("Setting env %d: %s=%s", s->num_env, name, val); |
deraadt@openbsd.org | 9e509d4 | 2017-05-31 09:15:42 +0000 | [diff] [blame] | 2039 | s->env = xrecallocarray(s->env, s->num_env, |
| 2040 | s->num_env + 1, sizeof(*s->env)); |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 2041 | s->env[s->num_env].name = name; |
| 2042 | s->env[s->num_env].val = val; |
| 2043 | s->num_env++; |
| 2044 | return (1); |
| 2045 | } |
| 2046 | } |
| 2047 | debug2("Ignoring env request %s: disallowed name", name); |
| 2048 | |
| 2049 | fail: |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2050 | free(name); |
| 2051 | free(val); |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 2052 | return (0); |
| 2053 | } |
| 2054 | |
| 2055 | static int |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2056 | session_auth_agent_req(Session *s) |
| 2057 | { |
| 2058 | static int called = 0; |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 2059 | packet_check_eom(); |
Damien Miller | 4f755cd | 2008-05-19 14:57:41 +1000 | [diff] [blame] | 2060 | if (no_agent_forwarding_flag || !options.allow_agent_forwarding) { |
Ben Lindstrom | 1492029 | 2000-11-21 21:24:55 +0000 | [diff] [blame] | 2061 | debug("session_auth_agent_req: no_agent_forwarding_flag"); |
| 2062 | return 0; |
| 2063 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2064 | if (called) { |
| 2065 | return 0; |
| 2066 | } else { |
| 2067 | called = 1; |
| 2068 | return auth_input_request_forwarding(s->pw); |
| 2069 | } |
| 2070 | } |
| 2071 | |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 2072 | int |
| 2073 | session_input_channel_req(Channel *c, const char *rtype) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2074 | { |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2075 | int success = 0; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2076 | Session *s; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2077 | |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 2078 | if ((s = session_by_channel(c->self)) == NULL) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 2079 | logit("session_input_channel_req: no session %d req %.100s", |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 2080 | c->self, rtype); |
| 2081 | return 0; |
| 2082 | } |
| 2083 | debug("session_input_channel_req: session %d req %s", s->self, rtype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2084 | |
| 2085 | /* |
Ben Lindstrom | fc9b07d | 2001-03-22 01:27:23 +0000 | [diff] [blame] | 2086 | * a session is in LARVAL state until a shell, a command |
| 2087 | * or a subsystem is executed |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2088 | */ |
| 2089 | if (c->type == SSH_CHANNEL_LARVAL) { |
| 2090 | if (strcmp(rtype, "shell") == 0) { |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 2091 | success = session_shell_req(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2092 | } else if (strcmp(rtype, "exec") == 0) { |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 2093 | success = session_exec_req(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2094 | } else if (strcmp(rtype, "pty-req") == 0) { |
Darren Tucker | 82a3d2b | 2007-02-19 22:10:25 +1100 | [diff] [blame] | 2095 | success = session_pty_req(s); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2096 | } else if (strcmp(rtype, "x11-req") == 0) { |
| 2097 | success = session_x11_req(s); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2098 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
| 2099 | success = session_auth_agent_req(s); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2100 | } else if (strcmp(rtype, "subsystem") == 0) { |
| 2101 | success = session_subsystem_req(s); |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 2102 | } else if (strcmp(rtype, "env") == 0) { |
| 2103 | success = session_env_req(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2104 | } |
| 2105 | } |
| 2106 | if (strcmp(rtype, "window-change") == 0) { |
| 2107 | success = session_window_change_req(s); |
Damien Miller | a6b1d16 | 2004-06-30 22:41:07 +1000 | [diff] [blame] | 2108 | } else if (strcmp(rtype, "break") == 0) { |
| 2109 | success = session_break_req(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2110 | } |
Damien Miller | a6b1d16 | 2004-06-30 22:41:07 +1000 | [diff] [blame] | 2111 | |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 2112 | return success; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2113 | } |
| 2114 | |
| 2115 | void |
Damien Miller | 8853ca5 | 2010-06-26 10:00:14 +1000 | [diff] [blame] | 2116 | session_set_fds(Session *s, int fdin, int fdout, int fderr, int ignore_fderr, |
| 2117 | int is_tty) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2118 | { |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2119 | /* |
| 2120 | * now that have a child and a pipe to the child, |
| 2121 | * we can activate our channel and register the fd's |
| 2122 | */ |
| 2123 | if (s->chanid == -1) |
| 2124 | fatal("no channel for session %d", s->self); |
| 2125 | channel_set_fds(s->chanid, |
| 2126 | fdout, fdin, fderr, |
Damien Miller | 8853ca5 | 2010-06-26 10:00:14 +1000 | [diff] [blame] | 2127 | ignore_fderr ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
Darren Tucker | ed3cdc0 | 2008-06-16 23:29:18 +1000 | [diff] [blame] | 2128 | 1, is_tty, CHAN_SES_WINDOW_DEFAULT); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2129 | } |
| 2130 | |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 2131 | /* |
| 2132 | * Function to perform pty cleanup. Also called if we get aborted abnormally |
| 2133 | * (e.g., due to a dropped connection). |
| 2134 | */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2135 | void |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2136 | session_pty_cleanup2(Session *s) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2137 | { |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 2138 | if (s == NULL) { |
| 2139 | error("session_pty_cleanup: no session"); |
| 2140 | return; |
| 2141 | } |
| 2142 | if (s->ttyfd == -1) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2143 | return; |
| 2144 | |
Kevin Steves | 43cdef3 | 2001-02-11 14:12:08 +0000 | [diff] [blame] | 2145 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2146 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2147 | /* Record that the user has logged out. */ |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 2148 | if (s->pid != 0) |
Tim Rice | e06ae4a | 2002-02-24 17:56:46 -0800 | [diff] [blame] | 2149 | record_logout(s->pid, s->tty, s->pw->pw_name); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2150 | |
| 2151 | /* Release the pseudo-tty. */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2152 | if (getuid() == 0) |
| 2153 | pty_release(s->tty); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2154 | |
| 2155 | /* |
| 2156 | * Close the server side of the socket pairs. We must do this after |
| 2157 | * the pty cleanup, so that another process doesn't get this pty |
| 2158 | * while we're still cleaning up. |
| 2159 | */ |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 2160 | if (s->ptymaster != -1 && close(s->ptymaster) < 0) |
| 2161 | error("close(s->ptymaster/%d): %s", |
| 2162 | s->ptymaster, strerror(errno)); |
Damien Miller | 0585d51 | 2001-10-12 11:35:50 +1000 | [diff] [blame] | 2163 | |
| 2164 | /* unlink pty from session */ |
| 2165 | s->ttyfd = -1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2166 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2167 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2168 | void |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2169 | session_pty_cleanup(Session *s) |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2170 | { |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2171 | PRIVSEP(session_pty_cleanup2(s)); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2172 | } |
| 2173 | |
Damien Miller | 5a80bba | 2002-09-04 16:39:02 +1000 | [diff] [blame] | 2174 | static char * |
| 2175 | sig2name(int sig) |
| 2176 | { |
| 2177 | #define SSH_SIG(x) if (sig == SIG ## x) return #x |
| 2178 | SSH_SIG(ABRT); |
| 2179 | SSH_SIG(ALRM); |
| 2180 | SSH_SIG(FPE); |
| 2181 | SSH_SIG(HUP); |
| 2182 | SSH_SIG(ILL); |
| 2183 | SSH_SIG(INT); |
| 2184 | SSH_SIG(KILL); |
| 2185 | SSH_SIG(PIPE); |
| 2186 | SSH_SIG(QUIT); |
| 2187 | SSH_SIG(SEGV); |
| 2188 | SSH_SIG(TERM); |
| 2189 | SSH_SIG(USR1); |
| 2190 | SSH_SIG(USR2); |
| 2191 | #undef SSH_SIG |
| 2192 | return "SIG@openssh.com"; |
| 2193 | } |
| 2194 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2195 | static void |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2196 | session_close_x11(int id) |
| 2197 | { |
| 2198 | Channel *c; |
| 2199 | |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 2200 | if ((c = channel_by_id(id)) == NULL) { |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2201 | debug("session_close_x11: x11 channel %d missing", id); |
| 2202 | } else { |
| 2203 | /* Detach X11 listener */ |
| 2204 | debug("session_close_x11: detach x11 channel %d", id); |
| 2205 | channel_cancel_cleanup(id); |
| 2206 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
| 2207 | chan_mark_dead(c); |
| 2208 | } |
| 2209 | } |
| 2210 | |
| 2211 | static void |
| 2212 | session_close_single_x11(int id, void *arg) |
| 2213 | { |
| 2214 | Session *s; |
| 2215 | u_int i; |
| 2216 | |
| 2217 | debug3("session_close_single_x11: channel %d", id); |
| 2218 | channel_cancel_cleanup(id); |
Darren Tucker | 82a3d2b | 2007-02-19 22:10:25 +1100 | [diff] [blame] | 2219 | if ((s = session_by_x11_channel(id)) == NULL) |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2220 | fatal("session_close_single_x11: no x11 channel %d", id); |
| 2221 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
| 2222 | debug("session_close_single_x11: session %d: " |
| 2223 | "closing channel %d", s->self, s->x11_chanids[i]); |
| 2224 | /* |
| 2225 | * The channel "id" is already closing, but make sure we |
| 2226 | * close all of its siblings. |
| 2227 | */ |
| 2228 | if (s->x11_chanids[i] != id) |
| 2229 | session_close_x11(s->x11_chanids[i]); |
| 2230 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2231 | free(s->x11_chanids); |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2232 | s->x11_chanids = NULL; |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2233 | free(s->display); |
| 2234 | s->display = NULL; |
| 2235 | free(s->auth_proto); |
| 2236 | s->auth_proto = NULL; |
| 2237 | free(s->auth_data); |
| 2238 | s->auth_data = NULL; |
| 2239 | free(s->auth_display); |
| 2240 | s->auth_display = NULL; |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2241 | } |
| 2242 | |
| 2243 | static void |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2244 | session_exit_message(Session *s, int status) |
| 2245 | { |
| 2246 | Channel *c; |
Damien Miller | f3dcf1f | 2002-02-08 22:06:48 +1100 | [diff] [blame] | 2247 | |
| 2248 | if ((c = channel_lookup(s->chanid)) == NULL) |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 2249 | fatal("session_exit_message: session %d: no channel %d", |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2250 | s->self, s->chanid); |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 2251 | debug("session_exit_message: session %d channel %d pid %ld", |
| 2252 | s->self, s->chanid, (long)s->pid); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2253 | |
| 2254 | if (WIFEXITED(status)) { |
Damien Miller | f3dcf1f | 2002-02-08 22:06:48 +1100 | [diff] [blame] | 2255 | channel_request_start(s->chanid, "exit-status", 0); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2256 | packet_put_int(WEXITSTATUS(status)); |
| 2257 | packet_send(); |
| 2258 | } else if (WIFSIGNALED(status)) { |
Damien Miller | f3dcf1f | 2002-02-08 22:06:48 +1100 | [diff] [blame] | 2259 | channel_request_start(s->chanid, "exit-signal", 0); |
Damien Miller | 5a80bba | 2002-09-04 16:39:02 +1000 | [diff] [blame] | 2260 | packet_put_cstring(sig2name(WTERMSIG(status))); |
Damien Miller | f3c6cf1 | 2000-05-17 22:08:29 +1000 | [diff] [blame] | 2261 | #ifdef WCOREDUMP |
Damien Miller | 767087b | 2008-03-07 18:32:42 +1100 | [diff] [blame] | 2262 | packet_put_char(WCOREDUMP(status)? 1 : 0); |
Damien Miller | f3c6cf1 | 2000-05-17 22:08:29 +1000 | [diff] [blame] | 2263 | #else /* WCOREDUMP */ |
| 2264 | packet_put_char(0); |
| 2265 | #endif /* WCOREDUMP */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2266 | packet_put_cstring(""); |
| 2267 | packet_put_cstring(""); |
| 2268 | packet_send(); |
| 2269 | } else { |
| 2270 | /* Some weird exit cause. Just exit. */ |
| 2271 | packet_disconnect("wait returned status %04x.", status); |
| 2272 | } |
| 2273 | |
| 2274 | /* disconnect channel */ |
| 2275 | debug("session_exit_message: release channel %d", s->chanid); |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 2276 | |
| 2277 | /* |
| 2278 | * Adjust cleanup callback attachment to send close messages when |
Damien Miller | c91e556 | 2006-03-26 13:58:55 +1100 | [diff] [blame] | 2279 | * the channel gets EOF. The session will be then be closed |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 2280 | * by session_close_by_channel when the childs close their fds. |
| 2281 | */ |
| 2282 | channel_register_cleanup(c->self, session_close_by_channel, 1); |
| 2283 | |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 2284 | /* |
| 2285 | * emulate a write failure with 'chan_write_failed', nobody will be |
| 2286 | * interested in data we write. |
| 2287 | * Note that we must not call 'chan_read_failed', since there could |
| 2288 | * be some more data waiting in the pipe. |
| 2289 | */ |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2290 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
| 2291 | chan_write_failed(c); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2292 | } |
| 2293 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2294 | void |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 2295 | session_close(Session *s) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2296 | { |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 2297 | struct ssh *ssh = active_state; /* XXX */ |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 2298 | u_int i; |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 2299 | |
djm@openbsd.org | 5a0fcb7 | 2016-02-16 03:37:48 +0000 | [diff] [blame] | 2300 | verbose("Close session: user %s from %.200s port %d id %d", |
| 2301 | s->pw->pw_name, |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 2302 | ssh_remote_ipaddr(ssh), |
| 2303 | ssh_remote_port(ssh), |
djm@openbsd.org | 5a0fcb7 | 2016-02-16 03:37:48 +0000 | [diff] [blame] | 2304 | s->self); |
| 2305 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2306 | if (s->ttyfd != -1) |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 2307 | session_pty_cleanup(s); |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2308 | free(s->term); |
| 2309 | free(s->display); |
| 2310 | free(s->x11_chanids); |
| 2311 | free(s->auth_display); |
| 2312 | free(s->auth_data); |
| 2313 | free(s->auth_proto); |
Damien Miller | 71df752 | 2013-10-15 12:12:02 +1100 | [diff] [blame] | 2314 | free(s->subsys); |
Damien Miller | d5fe0ba | 2006-08-30 11:07:39 +1000 | [diff] [blame] | 2315 | if (s->env != NULL) { |
| 2316 | for (i = 0; i < s->num_env; i++) { |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2317 | free(s->env[i].name); |
| 2318 | free(s->env[i].val); |
Damien Miller | d5fe0ba | 2006-08-30 11:07:39 +1000 | [diff] [blame] | 2319 | } |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 2320 | free(s->env); |
Damien Miller | d5fe0ba | 2006-08-30 11:07:39 +1000 | [diff] [blame] | 2321 | } |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2322 | session_proctitle(s); |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 2323 | session_unused(s->self); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2324 | } |
| 2325 | |
| 2326 | void |
| 2327 | session_close_by_pid(pid_t pid, int status) |
| 2328 | { |
| 2329 | Session *s = session_by_pid(pid); |
| 2330 | if (s == NULL) { |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 2331 | debug("session_close_by_pid: no session for pid %ld", |
| 2332 | (long)pid); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2333 | return; |
| 2334 | } |
| 2335 | if (s->chanid != -1) |
| 2336 | session_exit_message(s, status); |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 2337 | if (s->ttyfd != -1) |
| 2338 | session_pty_cleanup(s); |
Tim Rice | 83d2f5f | 2006-02-07 15:17:44 -0800 | [diff] [blame] | 2339 | s->pid = 0; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2340 | } |
| 2341 | |
| 2342 | /* |
| 2343 | * this is called when a channel dies before |
| 2344 | * the session 'child' itself dies |
| 2345 | */ |
| 2346 | void |
| 2347 | session_close_by_channel(int id, void *arg) |
| 2348 | { |
| 2349 | Session *s = session_by_channel(id); |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 2350 | u_int i; |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2351 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2352 | if (s == NULL) { |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2353 | debug("session_close_by_channel: no session for id %d", id); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2354 | return; |
| 2355 | } |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 2356 | debug("session_close_by_channel: channel %d child %ld", |
| 2357 | id, (long)s->pid); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2358 | if (s->pid != 0) { |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2359 | debug("session_close_by_channel: channel %d: has child", id); |
Damien Miller | 0585d51 | 2001-10-12 11:35:50 +1000 | [diff] [blame] | 2360 | /* |
| 2361 | * delay detach of session, but release pty, since |
| 2362 | * the fd's to the child are already closed |
| 2363 | */ |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2364 | if (s->ttyfd != -1) |
Damien Miller | 0585d51 | 2001-10-12 11:35:50 +1000 | [diff] [blame] | 2365 | session_pty_cleanup(s); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2366 | return; |
| 2367 | } |
| 2368 | /* detach by removing callback */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2369 | channel_cancel_cleanup(s->chanid); |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 2370 | |
| 2371 | /* Close any X11 listeners associated with this session */ |
| 2372 | if (s->x11_chanids != NULL) { |
| 2373 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
| 2374 | session_close_x11(s->x11_chanids[i]); |
| 2375 | s->x11_chanids[i] = -1; |
| 2376 | } |
| 2377 | } |
| 2378 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2379 | s->chanid = -1; |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 2380 | session_close(s); |
| 2381 | } |
| 2382 | |
| 2383 | void |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2384 | session_destroy_all(void (*closefunc)(Session *)) |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 2385 | { |
| 2386 | int i; |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 2387 | for (i = 0; i < sessions_nalloc; i++) { |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 2388 | Session *s = &sessions[i]; |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2389 | if (s->used) { |
| 2390 | if (closefunc != NULL) |
| 2391 | closefunc(s); |
| 2392 | else |
| 2393 | session_close(s); |
| 2394 | } |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 2395 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2396 | } |
| 2397 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2398 | static char * |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2399 | session_tty_list(void) |
| 2400 | { |
| 2401 | static char buf[1024]; |
| 2402 | int i; |
Damien Miller | a8ed44b | 2003-01-10 09:53:12 +1100 | [diff] [blame] | 2403 | char *cp; |
| 2404 | |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2405 | buf[0] = '\0'; |
Damien Miller | 7207f64 | 2008-05-19 15:34:50 +1000 | [diff] [blame] | 2406 | for (i = 0; i < sessions_nalloc; i++) { |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2407 | Session *s = &sessions[i]; |
| 2408 | if (s->used && s->ttyfd != -1) { |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 2409 | |
Damien Miller | a8ed44b | 2003-01-10 09:53:12 +1100 | [diff] [blame] | 2410 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
| 2411 | cp = strrchr(s->tty, '/'); |
| 2412 | cp = (cp == NULL) ? s->tty : cp + 1; |
| 2413 | } else |
| 2414 | cp = s->tty + 5; |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 2415 | |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2416 | if (buf[0] != '\0') |
| 2417 | strlcat(buf, ",", sizeof buf); |
Damien Miller | a8ed44b | 2003-01-10 09:53:12 +1100 | [diff] [blame] | 2418 | strlcat(buf, cp, sizeof buf); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2419 | } |
| 2420 | } |
| 2421 | if (buf[0] == '\0') |
| 2422 | strlcpy(buf, "notty", sizeof buf); |
| 2423 | return buf; |
| 2424 | } |
| 2425 | |
| 2426 | void |
| 2427 | session_proctitle(Session *s) |
| 2428 | { |
| 2429 | if (s->pw == NULL) |
| 2430 | error("no user for session %d", s->self); |
| 2431 | else |
| 2432 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); |
| 2433 | } |
| 2434 | |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2435 | int |
| 2436 | session_setup_x11fwd(Session *s) |
| 2437 | { |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2438 | struct stat st; |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2439 | char display[512], auth_display[512]; |
Damien Miller | e5c0d52 | 2014-07-03 21:24:19 +1000 | [diff] [blame] | 2440 | char hostname[NI_MAXHOST]; |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2441 | u_int i; |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2442 | |
| 2443 | if (no_x11_forwarding_flag) { |
| 2444 | packet_send_debug("X11 forwarding disabled in user configuration file."); |
| 2445 | return 0; |
| 2446 | } |
| 2447 | if (!options.x11_forwarding) { |
| 2448 | debug("X11 forwarding disabled in server configuration file."); |
| 2449 | return 0; |
| 2450 | } |
djm@openbsd.org | 161cf41 | 2014-12-22 07:55:51 +0000 | [diff] [blame] | 2451 | if (options.xauth_location == NULL || |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2452 | (stat(options.xauth_location, &st) == -1)) { |
| 2453 | packet_send_debug("No xauth program; cannot forward with spoofing."); |
| 2454 | return 0; |
| 2455 | } |
Ben Lindstrom | 2bcdf06 | 2001-06-13 04:41:41 +0000 | [diff] [blame] | 2456 | if (s->display != NULL) { |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2457 | debug("X11 display already set."); |
| 2458 | return 0; |
| 2459 | } |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2460 | if (x11_create_display_inet(options.x11_display_offset, |
| 2461 | options.x11_use_localhost, s->single_connection, |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2462 | &s->display_number, &s->x11_chanids) == -1) { |
Ben Lindstrom | 2bcdf06 | 2001-06-13 04:41:41 +0000 | [diff] [blame] | 2463 | debug("x11_create_display_inet failed."); |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2464 | return 0; |
| 2465 | } |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2466 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
| 2467 | channel_register_cleanup(s->x11_chanids[i], |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 2468 | session_close_single_x11, 0); |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2469 | } |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2470 | |
| 2471 | /* Set up a suitable value for the DISPLAY variable. */ |
| 2472 | if (gethostname(hostname, sizeof(hostname)) < 0) |
| 2473 | fatal("gethostname: %.100s", strerror(errno)); |
| 2474 | /* |
| 2475 | * auth_display must be used as the displayname when the |
| 2476 | * authorization entry is added with xauth(1). This will be |
| 2477 | * different than the DISPLAY string for localhost displays. |
| 2478 | */ |
Damien Miller | 95c249f | 2002-02-05 12:11:34 +1100 | [diff] [blame] | 2479 | if (options.x11_use_localhost) { |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2480 | snprintf(display, sizeof display, "localhost:%u.%u", |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2481 | s->display_number, s->screen); |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2482 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
Damien Miller | 512bccb | 2002-02-05 12:11:02 +1100 | [diff] [blame] | 2483 | s->display_number, s->screen); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2484 | s->display = xstrdup(display); |
Damien Miller | 512bccb | 2002-02-05 12:11:02 +1100 | [diff] [blame] | 2485 | s->auth_display = xstrdup(auth_display); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2486 | } else { |
| 2487 | #ifdef IPADDR_IN_DISPLAY |
| 2488 | struct hostent *he; |
| 2489 | struct in_addr my_addr; |
| 2490 | |
| 2491 | he = gethostbyname(hostname); |
| 2492 | if (he == NULL) { |
| 2493 | error("Can't get IP address for X11 DISPLAY."); |
| 2494 | packet_send_debug("Can't get IP address for X11 DISPLAY."); |
| 2495 | return 0; |
| 2496 | } |
| 2497 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2498 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2499 | s->display_number, s->screen); |
| 2500 | #else |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2501 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2502 | s->display_number, s->screen); |
| 2503 | #endif |
| 2504 | s->display = xstrdup(display); |
Damien Miller | 512bccb | 2002-02-05 12:11:02 +1100 | [diff] [blame] | 2505 | s->auth_display = xstrdup(display); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2506 | } |
| 2507 | |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2508 | return 1; |
| 2509 | } |
| 2510 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2511 | static void |
Ben Lindstrom | db65e8f | 2001-01-19 04:26:52 +0000 | [diff] [blame] | 2512 | do_authenticated2(Authctxt *authctxt) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2513 | { |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 2514 | server_loop2(authctxt); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2515 | } |
| 2516 | |
| 2517 | void |
| 2518 | do_cleanup(Authctxt *authctxt) |
| 2519 | { |
| 2520 | static int called = 0; |
| 2521 | |
| 2522 | debug("do_cleanup"); |
| 2523 | |
| 2524 | /* no cleanup if we're in the child for login shell */ |
| 2525 | if (is_child) |
| 2526 | return; |
| 2527 | |
| 2528 | /* avoid double cleanup */ |
| 2529 | if (called) |
| 2530 | return; |
| 2531 | called = 1; |
| 2532 | |
Darren Tucker | 9142e1c | 2007-08-16 23:28:04 +1000 | [diff] [blame] | 2533 | if (authctxt == NULL) |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2534 | return; |
Darren Tucker | 9142e1c | 2007-08-16 23:28:04 +1000 | [diff] [blame] | 2535 | |
| 2536 | #ifdef USE_PAM |
| 2537 | if (options.use_pam) { |
| 2538 | sshpam_cleanup(); |
| 2539 | sshpam_thread_cleanup(); |
| 2540 | } |
| 2541 | #endif |
| 2542 | |
| 2543 | if (!authctxt->authenticated) |
| 2544 | return; |
| 2545 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2546 | #ifdef KRB5 |
| 2547 | if (options.kerberos_ticket_cleanup && |
| 2548 | authctxt->krb5_ctx) |
| 2549 | krb5_cleanup_proc(authctxt); |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 2550 | #endif |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2551 | |
| 2552 | #ifdef GSSAPI |
markus@openbsd.org | 6cb6dcf | 2016-08-13 17:47:40 +0000 | [diff] [blame] | 2553 | if (options.gss_cleanup_creds) |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2554 | ssh_gssapi_cleanup_creds(); |
| 2555 | #endif |
| 2556 | |
| 2557 | /* remove agent socket */ |
| 2558 | auth_sock_cleanup_proc(authctxt->pw); |
| 2559 | |
| 2560 | /* |
| 2561 | * Cleanup ptys/utmp only if privsep is disabled, |
| 2562 | * or if running in monitor. |
| 2563 | */ |
| 2564 | if (!use_privsep || mm_is_monitor()) |
| 2565 | session_destroy_all(session_pty_cleanup2); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2566 | } |
djm@openbsd.org | 9576726 | 2016-03-07 19:02:43 +0000 | [diff] [blame] | 2567 | |
| 2568 | /* Return a name for the remote host that fits inside utmp_size */ |
| 2569 | |
| 2570 | const char * |
| 2571 | session_get_remote_name_or_ip(struct ssh *ssh, u_int utmp_size, int use_dns) |
| 2572 | { |
| 2573 | const char *remote = ""; |
| 2574 | |
| 2575 | if (utmp_size > 0) |
| 2576 | remote = auth_get_canonical_hostname(ssh, use_dns); |
| 2577 | if (utmp_size == 0 || strlen(remote) > utmp_size) |
| 2578 | remote = ssh_remote_ipaddr(ssh); |
| 2579 | return remote; |
| 2580 | } |
| 2581 | |