Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 3 | * All rights reserved |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 4 | * |
| 5 | * As far as I am concerned, the code I have written for this software |
| 6 | * can be used freely for any purpose. Any derived versions of this |
| 7 | * software must be clearly marked as such, and if the derived work is |
| 8 | * incompatible with the protocol description in the RFC file, it must be |
| 9 | * called by a name other than "ssh" or "Secure Shell". |
| 10 | * |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 11 | * SSH2 support by Markus Friedl. |
Ben Lindstrom | 4469723 | 2001-07-04 03:32:30 +0000 | [diff] [blame] | 12 | * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 13 | * |
| 14 | * Redistribution and use in source and binary forms, with or without |
| 15 | * modification, are permitted provided that the following conditions |
| 16 | * are met: |
| 17 | * 1. Redistributions of source code must retain the above copyright |
| 18 | * notice, this list of conditions and the following disclaimer. |
| 19 | * 2. Redistributions in binary form must reproduce the above copyright |
| 20 | * notice, this list of conditions and the following disclaimer in the |
| 21 | * documentation and/or other materials provided with the distribution. |
| 22 | * |
| 23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 24 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 25 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 26 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 27 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 28 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 29 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 30 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 31 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 32 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 33 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 34 | |
| 35 | #include "includes.h" |
Damien Miller | 1cf76d9 | 2006-03-15 12:01:14 +1100 | [diff] [blame] | 36 | RCSID("$OpenBSD: session.c,v 1.197 2006/02/28 01:10:21 djm Exp $"); |
Damien Miller | 9cf6d07 | 2006-03-15 11:29:24 +1100 | [diff] [blame] | 37 | |
| 38 | #include <sys/types.h> |
Damien Miller | f17883e | 2006-03-15 11:45:54 +1100 | [diff] [blame] | 39 | #ifdef HAVE_SYS_STAT_H |
| 40 | # include <sys/stat.h> |
| 41 | #endif |
Damien Miller | 9cf6d07 | 2006-03-15 11:29:24 +1100 | [diff] [blame] | 42 | #include <sys/wait.h> |
Damien Miller | 574c41f | 2006-03-15 11:40:10 +1100 | [diff] [blame] | 43 | #include <sys/un.h> |
Damien Miller | 03e2003 | 2006-03-15 11:16:59 +1100 | [diff] [blame] | 44 | |
| 45 | #include <paths.h> |
Damien Miller | 6ff3cad | 2006-03-15 11:52:09 +1100 | [diff] [blame] | 46 | #include <signal.h> |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 47 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 48 | #include "ssh.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 49 | #include "ssh1.h" |
| 50 | #include "ssh2.h" |
| 51 | #include "xmalloc.h" |
Ben Lindstrom | d95c09c | 2001-02-18 19:13:33 +0000 | [diff] [blame] | 52 | #include "sshpty.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 53 | #include "packet.h" |
| 54 | #include "buffer.h" |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 55 | #include "match.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 56 | #include "uidswap.h" |
| 57 | #include "compat.h" |
Ben Lindstrom | c763767 | 2001-06-09 00:36:26 +0000 | [diff] [blame] | 58 | #include "channels.h" |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 59 | #include "bufaux.h" |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 60 | #include "auth.h" |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 61 | #include "auth-options.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 62 | #include "pathnames.h" |
| 63 | #include "log.h" |
| 64 | #include "servconf.h" |
Ben Lindstrom | d95c09c | 2001-02-18 19:13:33 +0000 | [diff] [blame] | 65 | #include "sshlogin.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 66 | #include "serverloop.h" |
| 67 | #include "canohost.h" |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 68 | #include "session.h" |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 69 | #include "kex.h" |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 70 | #include "monitor_wrap.h" |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 71 | |
Darren Tucker | 3c78c5e | 2004-01-23 22:03:10 +1100 | [diff] [blame] | 72 | #if defined(KRB5) && defined(USE_AFS) |
Damien Miller | 8f341f8 | 2004-01-21 11:00:46 +1100 | [diff] [blame] | 73 | #include <kafs.h> |
| 74 | #endif |
| 75 | |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 76 | #ifdef GSSAPI |
| 77 | #include "ssh-gss.h" |
| 78 | #endif |
| 79 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 80 | /* func */ |
| 81 | |
| 82 | Session *session_new(void); |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 83 | void session_set_fds(Session *, int, int, int); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 84 | void session_pty_cleanup(Session *); |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 85 | void session_proctitle(Session *); |
| 86 | int session_setup_x11fwd(Session *); |
| 87 | void do_exec_pty(Session *, const char *); |
| 88 | void do_exec_no_pty(Session *, const char *); |
| 89 | void do_exec(Session *, const char *); |
| 90 | void do_login(Session *, const char *); |
Kevin Steves | a0957d6 | 2001-09-27 19:50:26 +0000 | [diff] [blame] | 91 | #ifdef LOGIN_NEEDS_UTMPX |
| 92 | static void do_pre_login(Session *s); |
| 93 | #endif |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 94 | void do_child(Session *, const char *); |
Damien Miller | cf205e8 | 2001-04-16 18:29:15 +1000 | [diff] [blame] | 95 | void do_motd(void); |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 96 | int check_quietlogin(Session *, const char *); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 97 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 98 | static void do_authenticated1(Authctxt *); |
| 99 | static void do_authenticated2(Authctxt *); |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 100 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 101 | static int session_pty_req(Session *); |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 102 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 103 | /* import */ |
| 104 | extern ServerOptions options; |
| 105 | extern char *__progname; |
| 106 | extern int log_stderr; |
| 107 | extern int debug_flag; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 108 | extern u_int utmp_len; |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 109 | extern int startup_pipe; |
Ben Lindstrom | 005dd22 | 2001-04-18 15:29:33 +0000 | [diff] [blame] | 110 | extern void destroy_sensitive_data(void); |
Darren Tucker | b9aa0a0 | 2003-07-08 22:59:59 +1000 | [diff] [blame] | 111 | extern Buffer loginmsg; |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 112 | |
Damien Miller | 7b28dc5 | 2000-09-05 13:34:53 +1100 | [diff] [blame] | 113 | /* original command from peer. */ |
Ben Lindstrom | 0a7ca6c | 2001-06-21 03:17:42 +0000 | [diff] [blame] | 114 | const char *original_command = NULL; |
Damien Miller | 7b28dc5 | 2000-09-05 13:34:53 +1100 | [diff] [blame] | 115 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 116 | /* data */ |
| 117 | #define MAX_SESSIONS 10 |
| 118 | Session sessions[MAX_SESSIONS]; |
Damien Miller | 15e7d4b | 2000-09-29 10:57:35 +1100 | [diff] [blame] | 119 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 120 | #ifdef HAVE_LOGIN_CAP |
Ben Lindstrom | b481e13 | 2002-03-22 01:35:47 +0000 | [diff] [blame] | 121 | login_cap_t *lc; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 122 | #endif |
| 123 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 124 | static int is_child = 0; |
| 125 | |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 126 | /* Name and directory of socket for authentication agent forwarding. */ |
| 127 | static char *auth_sock_name = NULL; |
| 128 | static char *auth_sock_dir = NULL; |
| 129 | |
| 130 | /* removes the agent forwarding socket */ |
| 131 | |
| 132 | static void |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 133 | auth_sock_cleanup_proc(struct passwd *pw) |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 134 | { |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 135 | if (auth_sock_name != NULL) { |
| 136 | temporarily_use_uid(pw); |
| 137 | unlink(auth_sock_name); |
| 138 | rmdir(auth_sock_dir); |
| 139 | auth_sock_name = NULL; |
| 140 | restore_uid(); |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | static int |
| 145 | auth_input_request_forwarding(struct passwd * pw) |
| 146 | { |
| 147 | Channel *nc; |
| 148 | int sock; |
| 149 | struct sockaddr_un sunaddr; |
| 150 | |
| 151 | if (auth_sock_name != NULL) { |
| 152 | error("authentication forwarding requested twice."); |
| 153 | return 0; |
| 154 | } |
| 155 | |
| 156 | /* Temporarily drop privileged uid for mkdir/bind. */ |
| 157 | temporarily_use_uid(pw); |
| 158 | |
| 159 | /* Allocate a buffer for the socket name, and format the name. */ |
| 160 | auth_sock_name = xmalloc(MAXPATHLEN); |
| 161 | auth_sock_dir = xmalloc(MAXPATHLEN); |
Darren Tucker | 072a7b1 | 2003-10-15 16:10:25 +1000 | [diff] [blame] | 162 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 163 | |
| 164 | /* Create private directory for socket */ |
| 165 | if (mkdtemp(auth_sock_dir) == NULL) { |
| 166 | packet_send_debug("Agent forwarding disabled: " |
| 167 | "mkdtemp() failed: %.100s", strerror(errno)); |
| 168 | restore_uid(); |
| 169 | xfree(auth_sock_name); |
| 170 | xfree(auth_sock_dir); |
| 171 | auth_sock_name = NULL; |
| 172 | auth_sock_dir = NULL; |
| 173 | return 0; |
| 174 | } |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 175 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", |
| 176 | auth_sock_dir, (long) getpid()); |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 177 | |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 178 | /* Create the socket. */ |
| 179 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
| 180 | if (sock < 0) |
| 181 | packet_disconnect("socket: %.100s", strerror(errno)); |
| 182 | |
| 183 | /* Bind it to the name. */ |
| 184 | memset(&sunaddr, 0, sizeof(sunaddr)); |
| 185 | sunaddr.sun_family = AF_UNIX; |
| 186 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); |
| 187 | |
| 188 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) |
| 189 | packet_disconnect("bind: %.100s", strerror(errno)); |
| 190 | |
| 191 | /* Restore the privileged uid. */ |
| 192 | restore_uid(); |
| 193 | |
| 194 | /* Start listening on the socket. */ |
Darren Tucker | 3175eb9 | 2003-12-09 19:15:11 +1100 | [diff] [blame] | 195 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 196 | packet_disconnect("listen: %.100s", strerror(errno)); |
| 197 | |
| 198 | /* Allocate a channel for the authentication agent socket. */ |
| 199 | nc = channel_new("auth socket", |
| 200 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, |
| 201 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 202 | 0, "auth socket", 1); |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 203 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
| 204 | return 1; |
| 205 | } |
| 206 | |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 207 | static void |
| 208 | display_loginmsg(void) |
| 209 | { |
Damien Miller | 46d38de | 2005-07-17 17:02:09 +1000 | [diff] [blame] | 210 | if (buffer_len(&loginmsg) > 0) { |
| 211 | buffer_append(&loginmsg, "\0", 1); |
| 212 | printf("%s", (char *)buffer_ptr(&loginmsg)); |
| 213 | buffer_clear(&loginmsg); |
| 214 | } |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 215 | } |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 216 | |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 217 | void |
| 218 | do_authenticated(Authctxt *authctxt) |
| 219 | { |
Damien Miller | 97f39ae | 2003-02-24 11:57:01 +1100 | [diff] [blame] | 220 | setproctitle("%s", authctxt->pw->pw_name); |
| 221 | |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 222 | /* setup the channel layer */ |
| 223 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) |
| 224 | channel_permit_all_opens(); |
| 225 | |
| 226 | if (compat20) |
| 227 | do_authenticated2(authctxt); |
| 228 | else |
| 229 | do_authenticated1(authctxt); |
Ben Lindstrom | 838394c | 2001-06-09 01:11:59 +0000 | [diff] [blame] | 230 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 231 | do_cleanup(authctxt); |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 232 | } |
| 233 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 234 | /* |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 235 | * Prepares for an interactive session. This is called after the user has |
| 236 | * been successfully authenticated. During this message exchange, pseudo |
| 237 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings |
| 238 | * are requested, etc. |
| 239 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 240 | static void |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 241 | do_authenticated1(Authctxt *authctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 242 | { |
| 243 | Session *s; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 244 | char *command; |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 245 | int success, type, screen_flag; |
Ben Lindstrom | e23f4a3 | 2002-06-23 21:40:16 +0000 | [diff] [blame] | 246 | int enable_compression_after_reply = 0; |
| 247 | u_int proto_len, data_len, dlen, compression_level = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 248 | |
| 249 | s = session_new(); |
Darren Tucker | 172a5e8 | 2005-01-20 10:55:46 +1100 | [diff] [blame] | 250 | if (s == NULL) { |
| 251 | error("no more sessions"); |
| 252 | return; |
| 253 | } |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 254 | s->authctxt = authctxt; |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 255 | s->pw = authctxt->pw; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 256 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 257 | /* |
| 258 | * We stay in this loop until the client requests to execute a shell |
| 259 | * or a command. |
| 260 | */ |
| 261 | for (;;) { |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 262 | success = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 263 | |
| 264 | /* Get a packet from the client. */ |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 265 | type = packet_read(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 266 | |
| 267 | /* Process the packet. */ |
| 268 | switch (type) { |
| 269 | case SSH_CMSG_REQUEST_COMPRESSION: |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 270 | compression_level = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 271 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 272 | if (compression_level < 1 || compression_level > 9) { |
Darren Tucker | 5cb30ad | 2004-08-12 22:40:24 +1000 | [diff] [blame] | 273 | packet_send_debug("Received invalid compression level %d.", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 274 | compression_level); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 275 | break; |
| 276 | } |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 277 | if (options.compression == COMP_NONE) { |
Ben Lindstrom | 23e0f66 | 2002-06-21 01:09:47 +0000 | [diff] [blame] | 278 | debug2("compression disabled"); |
| 279 | break; |
| 280 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 281 | /* Enable compression after we have responded with SUCCESS. */ |
| 282 | enable_compression_after_reply = 1; |
| 283 | success = 1; |
| 284 | break; |
| 285 | |
| 286 | case SSH_CMSG_REQUEST_PTY: |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 287 | success = session_pty_req(s); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 288 | break; |
| 289 | |
| 290 | case SSH_CMSG_X11_REQUEST_FORWARDING: |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 291 | s->auth_proto = packet_get_string(&proto_len); |
| 292 | s->auth_data = packet_get_string(&data_len); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 293 | |
Ben Lindstrom | 7603b2d | 2001-02-26 20:13:32 +0000 | [diff] [blame] | 294 | screen_flag = packet_get_protocol_flags() & |
| 295 | SSH_PROTOFLAG_SCREEN_NUMBER; |
| 296 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); |
| 297 | |
| 298 | if (packet_remaining() == 4) { |
| 299 | if (!screen_flag) |
| 300 | debug2("Buggy client: " |
| 301 | "X11 screen flag missing"); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 302 | s->screen = packet_get_int(); |
Ben Lindstrom | 8dcdeb8 | 2001-02-16 16:02:14 +0000 | [diff] [blame] | 303 | } else { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 304 | s->screen = 0; |
Ben Lindstrom | 8dcdeb8 | 2001-02-16 16:02:14 +0000 | [diff] [blame] | 305 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 306 | packet_check_eom(); |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 307 | success = session_setup_x11fwd(s); |
| 308 | if (!success) { |
| 309 | xfree(s->auth_proto); |
| 310 | xfree(s->auth_data); |
Ben Lindstrom | 88259fb | 2001-06-12 00:21:34 +0000 | [diff] [blame] | 311 | s->auth_proto = NULL; |
| 312 | s->auth_data = NULL; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 313 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 314 | break; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 315 | |
| 316 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: |
| 317 | if (no_agent_forwarding_flag || compat13) { |
| 318 | debug("Authentication agent forwarding not permitted for this authentication."); |
| 319 | break; |
| 320 | } |
| 321 | debug("Received authentication agent forwarding request."); |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 322 | success = auth_input_request_forwarding(s->pw); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 323 | break; |
| 324 | |
| 325 | case SSH_CMSG_PORT_FORWARD_REQUEST: |
| 326 | if (no_port_forwarding_flag) { |
| 327 | debug("Port forwarding not permitted for this authentication."); |
| 328 | break; |
| 329 | } |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 330 | if (!options.allow_tcp_forwarding) { |
| 331 | debug("Port forwarding not permitted."); |
| 332 | break; |
| 333 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 334 | debug("Received TCP/IP port forwarding request."); |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 335 | channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 336 | success = 1; |
| 337 | break; |
| 338 | |
| 339 | case SSH_CMSG_MAX_PACKET_SIZE: |
| 340 | if (packet_set_maxsize(packet_get_int()) > 0) |
| 341 | success = 1; |
| 342 | break; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 343 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 344 | case SSH_CMSG_EXEC_SHELL: |
| 345 | case SSH_CMSG_EXEC_CMD: |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 346 | if (type == SSH_CMSG_EXEC_CMD) { |
| 347 | command = packet_get_string(&dlen); |
| 348 | debug("Exec command '%.500s'", command); |
Ben Lindstrom | 0a7ca6c | 2001-06-21 03:17:42 +0000 | [diff] [blame] | 349 | do_exec(s, command); |
| 350 | xfree(command); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 351 | } else { |
Ben Lindstrom | 0a7ca6c | 2001-06-21 03:17:42 +0000 | [diff] [blame] | 352 | do_exec(s, NULL); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 353 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 354 | packet_check_eom(); |
Ben Lindstrom | cb3929d | 2001-06-09 01:34:15 +0000 | [diff] [blame] | 355 | session_close(s); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 356 | return; |
| 357 | |
| 358 | default: |
| 359 | /* |
| 360 | * Any unknown messages in this phase are ignored, |
| 361 | * and a failure message is returned. |
| 362 | */ |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 363 | logit("Unknown packet type received after authentication: %d", type); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 364 | } |
| 365 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); |
| 366 | packet_send(); |
| 367 | packet_write_wait(); |
| 368 | |
| 369 | /* Enable compression now that we have replied if appropriate. */ |
| 370 | if (enable_compression_after_reply) { |
| 371 | enable_compression_after_reply = 0; |
| 372 | packet_start_compression(compression_level); |
| 373 | } |
| 374 | } |
| 375 | } |
| 376 | |
| 377 | /* |
| 378 | * This is called to fork and execute a command when we have no tty. This |
| 379 | * will call do_child from the child, and server_loop from the parent after |
| 380 | * setting up file descriptors and such. |
| 381 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 382 | void |
Ben Lindstrom | b4c961d | 2001-03-22 01:25:37 +0000 | [diff] [blame] | 383 | do_exec_no_pty(Session *s, const char *command) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 384 | { |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 385 | pid_t pid; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 386 | |
| 387 | #ifdef USE_PIPES |
| 388 | int pin[2], pout[2], perr[2]; |
| 389 | /* Allocate pipes for communicating with the program. */ |
| 390 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) |
| 391 | packet_disconnect("Could not create pipes: %.100s", |
| 392 | strerror(errno)); |
| 393 | #else /* USE_PIPES */ |
| 394 | int inout[2], err[2]; |
| 395 | /* Uses socket pairs to communicate with the program. */ |
| 396 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || |
| 397 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) |
| 398 | packet_disconnect("Could not create socket pairs: %.100s", |
| 399 | strerror(errno)); |
| 400 | #endif /* USE_PIPES */ |
| 401 | if (s == NULL) |
| 402 | fatal("do_exec_no_pty: no session"); |
| 403 | |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 404 | session_proctitle(s); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 405 | |
Damien Miller | c594633 | 2001-02-28 11:46:11 +1100 | [diff] [blame] | 406 | #if defined(USE_PAM) |
Darren Tucker | 1825f26 | 2004-02-24 00:01:27 +1100 | [diff] [blame] | 407 | if (options.use_pam && !use_privsep) |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 408 | do_pam_setcred(1); |
Kevin Steves | ff793a2 | 2001-02-21 16:36:51 +0000 | [diff] [blame] | 409 | #endif /* USE_PAM */ |
| 410 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 411 | /* Fork the child. */ |
| 412 | if ((pid = fork()) == 0) { |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 413 | is_child = 1; |
Ben Lindstrom | 264ee30 | 2002-07-23 21:01:56 +0000 | [diff] [blame] | 414 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 415 | /* Child. Reinitialize the log since the pid has changed. */ |
| 416 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
| 417 | |
| 418 | /* |
| 419 | * Create a new session and process group since the 4.4BSD |
| 420 | * setlogin() affects the entire process group. |
| 421 | */ |
| 422 | if (setsid() < 0) |
| 423 | error("setsid failed: %.100s", strerror(errno)); |
| 424 | |
| 425 | #ifdef USE_PIPES |
| 426 | /* |
| 427 | * Redirect stdin. We close the parent side of the socket |
| 428 | * pair, and make the child side the standard input. |
| 429 | */ |
| 430 | close(pin[1]); |
| 431 | if (dup2(pin[0], 0) < 0) |
| 432 | perror("dup2 stdin"); |
| 433 | close(pin[0]); |
| 434 | |
| 435 | /* Redirect stdout. */ |
| 436 | close(pout[0]); |
| 437 | if (dup2(pout[1], 1) < 0) |
| 438 | perror("dup2 stdout"); |
| 439 | close(pout[1]); |
| 440 | |
| 441 | /* Redirect stderr. */ |
| 442 | close(perr[0]); |
| 443 | if (dup2(perr[1], 2) < 0) |
| 444 | perror("dup2 stderr"); |
| 445 | close(perr[1]); |
| 446 | #else /* USE_PIPES */ |
| 447 | /* |
| 448 | * Redirect stdin, stdout, and stderr. Stdin and stdout will |
| 449 | * use the same socket, as some programs (particularly rdist) |
| 450 | * seem to depend on it. |
| 451 | */ |
| 452 | close(inout[1]); |
| 453 | close(err[1]); |
| 454 | if (dup2(inout[0], 0) < 0) /* stdin */ |
| 455 | perror("dup2 stdin"); |
| 456 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ |
| 457 | perror("dup2 stdout"); |
| 458 | if (dup2(err[0], 2) < 0) /* stderr */ |
| 459 | perror("dup2 stderr"); |
| 460 | #endif /* USE_PIPES */ |
| 461 | |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 462 | #ifdef _UNICOS |
| 463 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ |
| 464 | #endif |
| 465 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 466 | /* Do processing for the child (exec command etc). */ |
Ben Lindstrom | 86fe868 | 2001-03-17 00:32:57 +0000 | [diff] [blame] | 467 | do_child(s, command); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 468 | /* NOTREACHED */ |
| 469 | } |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 470 | #ifdef _UNICOS |
| 471 | signal(WJSIGNAL, cray_job_termination_handler); |
| 472 | #endif /* _UNICOS */ |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 473 | #ifdef HAVE_CYGWIN |
| 474 | if (is_winnt) |
| 475 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); |
| 476 | #endif |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 477 | if (pid < 0) |
| 478 | packet_disconnect("fork failed: %.100s", strerror(errno)); |
| 479 | s->pid = pid; |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 480 | /* Set interactive/non-interactive mode. */ |
| 481 | packet_set_interactive(s->display != NULL); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 482 | #ifdef USE_PIPES |
| 483 | /* We are the parent. Close the child sides of the pipes. */ |
| 484 | close(pin[0]); |
| 485 | close(pout[1]); |
| 486 | close(perr[1]); |
| 487 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 488 | if (compat20) { |
Darren Tucker | 723e945 | 2004-06-22 12:57:08 +1000 | [diff] [blame] | 489 | if (s->is_subsystem) { |
| 490 | close(perr[0]); |
| 491 | perr[0] = -1; |
| 492 | } |
| 493 | session_set_fds(s, pin[1], pout[0], perr[0]); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 494 | } else { |
| 495 | /* Enter the interactive session. */ |
| 496 | server_loop(pid, pin[1], pout[0], perr[0]); |
Ben Lindstrom | fc9b07d | 2001-03-22 01:27:23 +0000 | [diff] [blame] | 497 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 498 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 499 | #else /* USE_PIPES */ |
| 500 | /* We are the parent. Close the child sides of the socket pairs. */ |
| 501 | close(inout[0]); |
| 502 | close(err[0]); |
| 503 | |
| 504 | /* |
Darren Tucker | b385059 | 2004-03-27 16:44:21 +1100 | [diff] [blame] | 505 | * Clear loginmsg, since it's the child's responsibility to display |
| 506 | * it to the user, otherwise multiple sessions may accumulate |
| 507 | * multiple copies of the login messages. |
| 508 | */ |
| 509 | buffer_clear(&loginmsg); |
| 510 | |
| 511 | /* |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 512 | * Enter the interactive session. Note: server_loop must be able to |
| 513 | * handle the case that fdin and fdout are the same. |
| 514 | */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 515 | if (compat20) { |
Ben Lindstrom | fc9b07d | 2001-03-22 01:27:23 +0000 | [diff] [blame] | 516 | session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 517 | } else { |
| 518 | server_loop(pid, inout[1], inout[1], err[1]); |
| 519 | /* server_loop has closed inout[1] and err[1]. */ |
| 520 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 521 | #endif /* USE_PIPES */ |
| 522 | } |
| 523 | |
| 524 | /* |
| 525 | * This is called to fork and execute a command when we have a tty. This |
| 526 | * will call do_child from the child, and server_loop from the parent after |
| 527 | * setting up file descriptors, controlling tty, updating wtmp, utmp, |
| 528 | * lastlog, and other such operations. |
| 529 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 530 | void |
Ben Lindstrom | b4c961d | 2001-03-22 01:25:37 +0000 | [diff] [blame] | 531 | do_exec_pty(Session *s, const char *command) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 532 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 533 | int fdout, ptyfd, ttyfd, ptymaster; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 534 | pid_t pid; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 535 | |
| 536 | if (s == NULL) |
| 537 | fatal("do_exec_pty: no session"); |
| 538 | ptyfd = s->ptyfd; |
| 539 | ttyfd = s->ttyfd; |
| 540 | |
Damien Miller | c594633 | 2001-02-28 11:46:11 +1100 | [diff] [blame] | 541 | #if defined(USE_PAM) |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 542 | if (options.use_pam) { |
Damien Miller | 341c6e6 | 2003-09-02 23:18:52 +1000 | [diff] [blame] | 543 | do_pam_set_tty(s->tty); |
Darren Tucker | ef3a4a2 | 2004-02-06 15:30:50 +1100 | [diff] [blame] | 544 | if (!use_privsep) |
| 545 | do_pam_setcred(1); |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 546 | } |
Damien Miller | 5a76131 | 2001-02-27 09:28:23 +1100 | [diff] [blame] | 547 | #endif |
Kevin Steves | ff793a2 | 2001-02-21 16:36:51 +0000 | [diff] [blame] | 548 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 549 | /* Fork the child. */ |
| 550 | if ((pid = fork()) == 0) { |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 551 | is_child = 1; |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 552 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 553 | /* Child. Reinitialize the log because the pid has changed. */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 554 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 555 | /* Close the master side of the pseudo tty. */ |
| 556 | close(ptyfd); |
| 557 | |
| 558 | /* Make the pseudo tty our controlling tty. */ |
| 559 | pty_make_controlling_tty(&ttyfd, s->tty); |
| 560 | |
Damien Miller | 9c75142 | 2001-10-10 15:02:46 +1000 | [diff] [blame] | 561 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ |
| 562 | if (dup2(ttyfd, 0) < 0) |
| 563 | error("dup2 stdin: %s", strerror(errno)); |
| 564 | if (dup2(ttyfd, 1) < 0) |
| 565 | error("dup2 stdout: %s", strerror(errno)); |
| 566 | if (dup2(ttyfd, 2) < 0) |
| 567 | error("dup2 stderr: %s", strerror(errno)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 568 | |
| 569 | /* Close the extra descriptor for the pseudo tty. */ |
| 570 | close(ttyfd); |
| 571 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 572 | /* record login, etc. similar to login(1) */ |
Damien Miller | 364a9bd | 2001-04-16 18:37:05 +1000 | [diff] [blame] | 573 | #ifndef HAVE_OSF_SIA |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 574 | if (!(options.use_login && command == NULL)) { |
| 575 | #ifdef _UNICOS |
| 576 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ |
| 577 | #endif /* _UNICOS */ |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 578 | do_login(s, command); |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 579 | } |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 580 | # ifdef LOGIN_NEEDS_UTMPX |
| 581 | else |
| 582 | do_pre_login(s); |
| 583 | # endif |
Damien Miller | 364a9bd | 2001-04-16 18:37:05 +1000 | [diff] [blame] | 584 | #endif |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 585 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 586 | /* Do common processing for the child, such as execing the command. */ |
Ben Lindstrom | 86fe868 | 2001-03-17 00:32:57 +0000 | [diff] [blame] | 587 | do_child(s, command); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 588 | /* NOTREACHED */ |
| 589 | } |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 590 | #ifdef _UNICOS |
| 591 | signal(WJSIGNAL, cray_job_termination_handler); |
| 592 | #endif /* _UNICOS */ |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 593 | #ifdef HAVE_CYGWIN |
| 594 | if (is_winnt) |
| 595 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); |
| 596 | #endif |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 597 | if (pid < 0) |
| 598 | packet_disconnect("fork failed: %.100s", strerror(errno)); |
| 599 | s->pid = pid; |
| 600 | |
| 601 | /* Parent. Close the slave side of the pseudo tty. */ |
| 602 | close(ttyfd); |
| 603 | |
| 604 | /* |
| 605 | * Create another descriptor of the pty master side for use as the |
| 606 | * standard input. We could use the original descriptor, but this |
| 607 | * simplifies code in server_loop. The descriptor is bidirectional. |
| 608 | */ |
| 609 | fdout = dup(ptyfd); |
| 610 | if (fdout < 0) |
| 611 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); |
| 612 | |
| 613 | /* we keep a reference to the pty master */ |
| 614 | ptymaster = dup(ptyfd); |
| 615 | if (ptymaster < 0) |
| 616 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); |
| 617 | s->ptymaster = ptymaster; |
| 618 | |
| 619 | /* Enter interactive session. */ |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 620 | packet_set_interactive(1); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 621 | if (compat20) { |
| 622 | session_set_fds(s, ptyfd, fdout, -1); |
| 623 | } else { |
| 624 | server_loop(pid, ptyfd, fdout, -1); |
| 625 | /* server_loop _has_ closed ptyfd and fdout. */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 626 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 627 | } |
| 628 | |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 629 | #ifdef LOGIN_NEEDS_UTMPX |
Damien Miller | 599d8eb | 2001-09-15 12:25:53 +1000 | [diff] [blame] | 630 | static void |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 631 | do_pre_login(Session *s) |
| 632 | { |
| 633 | socklen_t fromlen; |
| 634 | struct sockaddr_storage from; |
| 635 | pid_t pid = getpid(); |
| 636 | |
| 637 | /* |
| 638 | * Get IP address of client. If the connection is not a socket, let |
| 639 | * the address be 0.0.0.0. |
| 640 | */ |
| 641 | memset(&from, 0, sizeof(from)); |
Damien Miller | ebc2306 | 2002-09-04 16:45:09 +1000 | [diff] [blame] | 642 | fromlen = sizeof(from); |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 643 | if (packet_connection_is_on_socket()) { |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 644 | if (getpeername(packet_get_connection_in(), |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 645 | (struct sockaddr *) & from, &fromlen) < 0) { |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 646 | debug("getpeername: %.100s", strerror(errno)); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 647 | cleanup_exit(255); |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 648 | } |
| 649 | } |
| 650 | |
| 651 | record_utmp_only(pid, s->tty, s->pw->pw_name, |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 652 | get_remote_name_or_ip(utmp_len, options.use_dns), |
Kevin Steves | 678ee51 | 2003-01-01 23:43:55 +0000 | [diff] [blame] | 653 | (struct sockaddr *)&from, fromlen); |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 654 | } |
| 655 | #endif |
| 656 | |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 657 | /* |
| 658 | * This is called to fork and execute a command. If another command is |
| 659 | * to be forced, execute that instead. |
| 660 | */ |
| 661 | void |
| 662 | do_exec(Session *s, const char *command) |
| 663 | { |
| 664 | if (forced_command) { |
| 665 | original_command = command; |
| 666 | command = forced_command; |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 667 | debug("Forced command '%.900s'", command); |
| 668 | } |
| 669 | |
Darren Tucker | 2e0cf0d | 2005-02-08 21:52:47 +1100 | [diff] [blame] | 670 | #ifdef SSH_AUDIT_EVENTS |
Darren Tucker | 269a1ea | 2005-02-03 00:20:53 +1100 | [diff] [blame] | 671 | if (command != NULL) |
| 672 | PRIVSEP(audit_run_command(command)); |
| 673 | else if (s->ttyfd == -1) { |
| 674 | char *shell = s->pw->pw_shell; |
| 675 | |
| 676 | if (shell[0] == '\0') /* empty shell means /bin/sh */ |
| 677 | shell =_PATH_BSHELL; |
| 678 | PRIVSEP(audit_run_command(shell)); |
| 679 | } |
| 680 | #endif |
| 681 | |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 682 | if (s->ttyfd != -1) |
| 683 | do_exec_pty(s, command); |
| 684 | else |
| 685 | do_exec_no_pty(s, command); |
| 686 | |
Ben Lindstrom | 0a7ca6c | 2001-06-21 03:17:42 +0000 | [diff] [blame] | 687 | original_command = NULL; |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 688 | |
Darren Tucker | 0999174 | 2004-07-17 17:05:14 +1000 | [diff] [blame] | 689 | /* |
| 690 | * Clear loginmsg: it's the child's responsibility to display |
| 691 | * it to the user, otherwise multiple sessions may accumulate |
| 692 | * multiple copies of the login messages. |
| 693 | */ |
| 694 | buffer_clear(&loginmsg); |
| 695 | } |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 696 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 697 | /* administrative, login(1)-like work */ |
| 698 | void |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 699 | do_login(Session *s, const char *command) |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 700 | { |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 701 | socklen_t fromlen; |
| 702 | struct sockaddr_storage from; |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 703 | struct passwd * pw = s->pw; |
| 704 | pid_t pid = getpid(); |
| 705 | |
| 706 | /* |
| 707 | * Get IP address of client. If the connection is not a socket, let |
| 708 | * the address be 0.0.0.0. |
| 709 | */ |
| 710 | memset(&from, 0, sizeof(from)); |
Kevin Steves | 678ee51 | 2003-01-01 23:43:55 +0000 | [diff] [blame] | 711 | fromlen = sizeof(from); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 712 | if (packet_connection_is_on_socket()) { |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 713 | if (getpeername(packet_get_connection_in(), |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 714 | (struct sockaddr *) & from, &fromlen) < 0) { |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 715 | debug("getpeername: %.100s", strerror(errno)); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 716 | cleanup_exit(255); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 717 | } |
| 718 | } |
| 719 | |
| 720 | /* 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] | 721 | if (!use_privsep) |
| 722 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, |
| 723 | get_remote_name_or_ip(utmp_len, |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 724 | options.use_dns), |
Damien Miller | ebc2306 | 2002-09-04 16:45:09 +1000 | [diff] [blame] | 725 | (struct sockaddr *)&from, fromlen); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 726 | |
Kevin Steves | 092f2ef | 2000-10-14 13:36:13 +0000 | [diff] [blame] | 727 | #ifdef USE_PAM |
| 728 | /* |
| 729 | * If password change is needed, do it now. |
| 730 | * This needs to occur before the ~/.hushlogin check. |
| 731 | */ |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 732 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
| 733 | display_loginmsg(); |
Kevin Steves | 092f2ef | 2000-10-14 13:36:13 +0000 | [diff] [blame] | 734 | do_pam_chauthtok(); |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 735 | s->authctxt->force_pwchange = 0; |
Damien Miller | 1f499fd | 2003-08-25 13:08:49 +1000 | [diff] [blame] | 736 | /* XXX - signal [net] parent to enable forwardings */ |
Kevin Steves | 092f2ef | 2000-10-14 13:36:13 +0000 | [diff] [blame] | 737 | } |
| 738 | #endif |
| 739 | |
Damien Miller | cf205e8 | 2001-04-16 18:29:15 +1000 | [diff] [blame] | 740 | if (check_quietlogin(s, command)) |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 741 | return; |
| 742 | |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 743 | display_loginmsg(); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 744 | |
Damien Miller | cf205e8 | 2001-04-16 18:29:15 +1000 | [diff] [blame] | 745 | do_motd(); |
| 746 | } |
| 747 | |
| 748 | /* |
| 749 | * Display the message of the day. |
| 750 | */ |
| 751 | void |
| 752 | do_motd(void) |
| 753 | { |
| 754 | FILE *f; |
| 755 | char buf[256]; |
| 756 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 757 | if (options.print_motd) { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 758 | #ifdef HAVE_LOGIN_CAP |
| 759 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", |
| 760 | "/etc/motd"), "r"); |
| 761 | #else |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 762 | f = fopen("/etc/motd", "r"); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 763 | #endif |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 764 | if (f) { |
| 765 | while (fgets(buf, sizeof(buf), f)) |
| 766 | fputs(buf, stdout); |
| 767 | fclose(f); |
| 768 | } |
| 769 | } |
| 770 | } |
| 771 | |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 772 | |
| 773 | /* |
| 774 | * Check for quiet login, either .hushlogin or command given. |
| 775 | */ |
| 776 | int |
| 777 | check_quietlogin(Session *s, const char *command) |
| 778 | { |
| 779 | char buf[256]; |
| 780 | struct passwd *pw = s->pw; |
| 781 | struct stat st; |
| 782 | |
| 783 | /* Return 1 if .hushlogin exists or a command given. */ |
| 784 | if (command != NULL) |
| 785 | return 1; |
| 786 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); |
| 787 | #ifdef HAVE_LOGIN_CAP |
| 788 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) |
| 789 | return 1; |
| 790 | #else |
| 791 | if (stat(buf, &st) >= 0) |
| 792 | return 1; |
| 793 | #endif |
| 794 | return 0; |
| 795 | } |
| 796 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 797 | /* |
| 798 | * Sets the value of the given variable in the environment. If the variable |
| 799 | * already exists, its value is overriden. |
| 800 | */ |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 801 | void |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 802 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 803 | const char *value) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 804 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 805 | char **env; |
Darren Tucker | fb16b24 | 2003-09-22 21:04:23 +1000 | [diff] [blame] | 806 | u_int envsize; |
| 807 | u_int i, namelen; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 808 | |
| 809 | /* |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 810 | * If we're passed an uninitialized list, allocate a single null |
| 811 | * entry before continuing. |
| 812 | */ |
| 813 | if (*envp == NULL && *envsizep == 0) { |
| 814 | *envp = xmalloc(sizeof(char *)); |
| 815 | *envp[0] = NULL; |
| 816 | *envsizep = 1; |
| 817 | } |
| 818 | |
| 819 | /* |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 820 | * Find the slot where the value should be stored. If the variable |
| 821 | * already exists, we reuse the slot; otherwise we append a new slot |
| 822 | * at the end of the array, expanding if necessary. |
| 823 | */ |
| 824 | env = *envp; |
| 825 | namelen = strlen(name); |
| 826 | for (i = 0; env[i]; i++) |
| 827 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') |
| 828 | break; |
| 829 | if (env[i]) { |
| 830 | /* Reuse the slot. */ |
| 831 | xfree(env[i]); |
| 832 | } else { |
| 833 | /* New variable. Expand if necessary. */ |
Darren Tucker | fb16b24 | 2003-09-22 21:04:23 +1000 | [diff] [blame] | 834 | envsize = *envsizep; |
| 835 | if (i >= envsize - 1) { |
| 836 | if (envsize >= 1000) |
| 837 | fatal("child_set_env: too many env vars"); |
| 838 | envsize += 50; |
| 839 | env = (*envp) = xrealloc(env, envsize * sizeof(char *)); |
| 840 | *envsizep = envsize; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 841 | } |
| 842 | /* Need to set the NULL pointer at end of array beyond the new slot. */ |
| 843 | env[i + 1] = NULL; |
| 844 | } |
| 845 | |
| 846 | /* Allocate space and format the variable in the appropriate slot. */ |
| 847 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); |
| 848 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); |
| 849 | } |
| 850 | |
| 851 | /* |
| 852 | * Reads environment variables from the given file and adds/overrides them |
| 853 | * into the environment. If the file does not exist, this does nothing. |
| 854 | * Otherwise, it must consist of empty lines, comments (line starts with '#') |
| 855 | * and assignments of the form name=value. No other forms are allowed. |
| 856 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 857 | static void |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 858 | read_environment_file(char ***env, u_int *envsize, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 859 | const char *filename) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 860 | { |
| 861 | FILE *f; |
| 862 | char buf[4096]; |
| 863 | char *cp, *value; |
Damien Miller | 990070a | 2002-06-26 23:51:06 +1000 | [diff] [blame] | 864 | u_int lineno = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 865 | |
| 866 | f = fopen(filename, "r"); |
| 867 | if (!f) |
| 868 | return; |
| 869 | |
| 870 | while (fgets(buf, sizeof(buf), f)) { |
Damien Miller | 990070a | 2002-06-26 23:51:06 +1000 | [diff] [blame] | 871 | if (++lineno > 1000) |
| 872 | fatal("Too many lines in environment file %s", filename); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 873 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
| 874 | ; |
| 875 | if (!*cp || *cp == '#' || *cp == '\n') |
| 876 | continue; |
| 877 | if (strchr(cp, '\n')) |
| 878 | *strchr(cp, '\n') = '\0'; |
| 879 | value = strchr(cp, '='); |
| 880 | if (value == NULL) { |
Damien Miller | 990070a | 2002-06-26 23:51:06 +1000 | [diff] [blame] | 881 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
| 882 | filename); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 883 | continue; |
| 884 | } |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 885 | /* |
| 886 | * Replace the equals sign by nul, and advance value to |
| 887 | * the value string. |
| 888 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 889 | *value = '\0'; |
| 890 | value++; |
| 891 | child_set_env(env, envsize, cp, value); |
| 892 | } |
| 893 | fclose(f); |
| 894 | } |
| 895 | |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 896 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
| 897 | /* |
| 898 | * Return named variable from specified environment, or NULL if not present. |
| 899 | */ |
| 900 | static char * |
| 901 | child_get_env(char **env, const char *name) |
| 902 | { |
| 903 | int i; |
| 904 | size_t len; |
| 905 | |
| 906 | len = strlen(name); |
| 907 | for (i=0; env[i] != NULL; i++) |
| 908 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') |
| 909 | return(env[i] + len + 1); |
| 910 | return NULL; |
| 911 | } |
| 912 | |
| 913 | /* |
| 914 | * Read /etc/default/login. |
| 915 | * We pick up the PATH (or SUPATH for root) and UMASK. |
| 916 | */ |
| 917 | static void |
| 918 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) |
| 919 | { |
| 920 | char **tmpenv = NULL, *var; |
Darren Tucker | c11b1e8 | 2003-09-19 20:56:51 +1000 | [diff] [blame] | 921 | u_int i, tmpenvsize = 0; |
Darren Tucker | f391ba6 | 2003-10-02 20:07:09 +1000 | [diff] [blame] | 922 | u_long mask; |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 923 | |
| 924 | /* |
| 925 | * We don't want to copy the whole file to the child's environment, |
| 926 | * so we use a temporary environment and copy the variables we're |
| 927 | * interested in. |
| 928 | */ |
| 929 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); |
| 930 | |
Darren Tucker | c11b1e8 | 2003-09-19 20:56:51 +1000 | [diff] [blame] | 931 | if (tmpenv == NULL) |
| 932 | return; |
| 933 | |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 934 | if (uid == 0) |
| 935 | var = child_get_env(tmpenv, "SUPATH"); |
| 936 | else |
| 937 | var = child_get_env(tmpenv, "PATH"); |
| 938 | if (var != NULL) |
| 939 | child_set_env(env, envsize, "PATH", var); |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 940 | |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 941 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
| 942 | if (sscanf(var, "%5lo", &mask) == 1) |
Darren Tucker | f391ba6 | 2003-10-02 20:07:09 +1000 | [diff] [blame] | 943 | umask((mode_t)mask); |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 944 | |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 945 | for (i = 0; tmpenv[i] != NULL; i++) |
| 946 | xfree(tmpenv[i]); |
| 947 | xfree(tmpenv); |
| 948 | } |
| 949 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ |
| 950 | |
Damien Miller | 7dff869 | 2005-05-26 11:34:51 +1000 | [diff] [blame] | 951 | void |
| 952 | copy_environment(char **source, char ***env, u_int *envsize) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 953 | { |
Damien Miller | bb9ffc1 | 2002-01-08 10:59:32 +1100 | [diff] [blame] | 954 | char *var_name, *var_val; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 955 | int i; |
| 956 | |
Damien Miller | bb9ffc1 | 2002-01-08 10:59:32 +1100 | [diff] [blame] | 957 | if (source == NULL) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 958 | return; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 959 | |
Damien Miller | bb9ffc1 | 2002-01-08 10:59:32 +1100 | [diff] [blame] | 960 | for(i = 0; source[i] != NULL; i++) { |
| 961 | var_name = xstrdup(source[i]); |
| 962 | if ((var_val = strstr(var_name, "=")) == NULL) { |
| 963 | xfree(var_name); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 964 | continue; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 965 | } |
Damien Miller | bb9ffc1 | 2002-01-08 10:59:32 +1100 | [diff] [blame] | 966 | *var_val++ = '\0'; |
| 967 | |
| 968 | debug3("Copy environment: %s=%s", var_name, var_val); |
| 969 | child_set_env(env, envsize, var_name, var_val); |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 970 | |
Damien Miller | bb9ffc1 | 2002-01-08 10:59:32 +1100 | [diff] [blame] | 971 | xfree(var_name); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 972 | } |
| 973 | } |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 974 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 975 | static char ** |
| 976 | do_setup_env(Session *s, const char *shell) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 977 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 978 | char buf[256]; |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 979 | u_int i, envsize; |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 980 | char **env, *laddr, *path = NULL; |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 981 | struct passwd *pw = s->pw; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 982 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 983 | /* Initialize the environment. */ |
| 984 | envsize = 100; |
| 985 | env = xmalloc(envsize * sizeof(char *)); |
| 986 | env[0] = NULL; |
| 987 | |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 988 | #ifdef HAVE_CYGWIN |
| 989 | /* |
| 990 | * The Windows environment contains some setting which are |
| 991 | * important for a running system. They must not be dropped. |
| 992 | */ |
Darren Tucker | 14c372d | 2004-08-30 20:42:08 +1000 | [diff] [blame] | 993 | { |
| 994 | char **p; |
| 995 | |
| 996 | p = fetch_windows_environment(); |
| 997 | copy_environment(p, &env, &envsize); |
| 998 | free_windows_environment(p); |
| 999 | } |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 1000 | #endif |
| 1001 | |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 1002 | #ifdef GSSAPI |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 1003 | /* Allow any GSSAPI methods that we've used to alter |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 1004 | * the childs environment as they see fit |
| 1005 | */ |
| 1006 | ssh_gssapi_do_child(&env, &envsize); |
| 1007 | #endif |
| 1008 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1009 | if (!options.use_login) { |
| 1010 | /* Set basic environment. */ |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 1011 | for (i = 0; i < s->num_env; i++) |
Darren Tucker | fc95970 | 2004-07-17 16:12:08 +1000 | [diff] [blame] | 1012 | child_set_env(&env, &envsize, s->env[i].name, |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 1013 | s->env[i].val); |
| 1014 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1015 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
| 1016 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); |
Damien Miller | dfedbf8 | 2003-01-03 14:52:53 +1100 | [diff] [blame] | 1017 | #ifdef _AIX |
| 1018 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); |
| 1019 | #endif |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1020 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1021 | #ifdef HAVE_LOGIN_CAP |
Ben Lindstrom | b9051ec | 2002-07-23 21:11:09 +0000 | [diff] [blame] | 1022 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
| 1023 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); |
| 1024 | else |
| 1025 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 1026 | #else /* HAVE_LOGIN_CAP */ |
| 1027 | # ifndef HAVE_CYGWIN |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 1028 | /* |
| 1029 | * There's no standard path on Windows. The path contains |
| 1030 | * important components pointing to the system directories, |
| 1031 | * needed for loading shared libraries. So the path better |
| 1032 | * remains intact here. |
| 1033 | */ |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 1034 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
| 1035 | read_etc_default_login(&env, &envsize, pw->pw_uid); |
| 1036 | path = child_get_env(env, "PATH"); |
| 1037 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ |
| 1038 | if (path == NULL || *path == '\0') { |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 1039 | child_set_env(&env, &envsize, "PATH", |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 1040 | s->pw->pw_uid == 0 ? |
| 1041 | SUPERUSER_PATH : _PATH_STDPATH); |
| 1042 | } |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 1043 | # endif /* HAVE_CYGWIN */ |
| 1044 | #endif /* HAVE_LOGIN_CAP */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1045 | |
| 1046 | snprintf(buf, sizeof buf, "%.200s/%.50s", |
| 1047 | _PATH_MAILDIR, pw->pw_name); |
| 1048 | child_set_env(&env, &envsize, "MAIL", buf); |
| 1049 | |
| 1050 | /* Normal systems set SHELL by default. */ |
| 1051 | child_set_env(&env, &envsize, "SHELL", shell); |
| 1052 | } |
| 1053 | if (getenv("TZ")) |
| 1054 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); |
| 1055 | |
| 1056 | /* Set custom environment options from RSA authentication. */ |
Ben Lindstrom | 38b951c | 2001-12-06 17:47:47 +0000 | [diff] [blame] | 1057 | if (!options.use_login) { |
| 1058 | while (custom_environment) { |
| 1059 | struct envstring *ce = custom_environment; |
Ben Lindstrom | 5a9d0ea | 2002-07-04 00:12:53 +0000 | [diff] [blame] | 1060 | char *str = ce->s; |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1061 | |
Ben Lindstrom | 5a9d0ea | 2002-07-04 00:12:53 +0000 | [diff] [blame] | 1062 | for (i = 0; str[i] != '=' && str[i]; i++) |
Ben Lindstrom | 38b951c | 2001-12-06 17:47:47 +0000 | [diff] [blame] | 1063 | ; |
Ben Lindstrom | 5a9d0ea | 2002-07-04 00:12:53 +0000 | [diff] [blame] | 1064 | if (str[i] == '=') { |
| 1065 | str[i] = 0; |
| 1066 | child_set_env(&env, &envsize, str, str + i + 1); |
Ben Lindstrom | 38b951c | 2001-12-06 17:47:47 +0000 | [diff] [blame] | 1067 | } |
| 1068 | custom_environment = ce->next; |
| 1069 | xfree(ce->s); |
| 1070 | xfree(ce); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1071 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1072 | } |
| 1073 | |
Damien Miller | f37e246 | 2002-09-19 11:47:55 +1000 | [diff] [blame] | 1074 | /* SSH_CLIENT deprecated */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1075 | snprintf(buf, sizeof buf, "%.50s %d %d", |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1076 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1077 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
| 1078 | |
Damien Miller | 0011138 | 2003-03-10 11:21:17 +1100 | [diff] [blame] | 1079 | laddr = get_local_ipaddr(packet_get_connection_in()); |
Damien Miller | f37e246 | 2002-09-19 11:47:55 +1000 | [diff] [blame] | 1080 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
Damien Miller | 0011138 | 2003-03-10 11:21:17 +1100 | [diff] [blame] | 1081 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
| 1082 | xfree(laddr); |
Damien Miller | f37e246 | 2002-09-19 11:47:55 +1000 | [diff] [blame] | 1083 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
| 1084 | |
Ben Lindstrom | 86fe868 | 2001-03-17 00:32:57 +0000 | [diff] [blame] | 1085 | if (s->ttyfd != -1) |
| 1086 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); |
| 1087 | if (s->term) |
| 1088 | child_set_env(&env, &envsize, "TERM", s->term); |
| 1089 | if (s->display) |
| 1090 | child_set_env(&env, &envsize, "DISPLAY", s->display); |
Damien Miller | 7b28dc5 | 2000-09-05 13:34:53 +1100 | [diff] [blame] | 1091 | if (original_command) |
| 1092 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", |
| 1093 | original_command); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1094 | |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 1095 | #ifdef _UNICOS |
| 1096 | if (cray_tmpdir[0] != '\0') |
| 1097 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); |
| 1098 | #endif /* _UNICOS */ |
| 1099 | |
Darren Tucker | 9dc6c7d | 2005-02-02 18:30:33 +1100 | [diff] [blame] | 1100 | /* |
| 1101 | * Since we clear KRB5CCNAME at startup, if it's set now then it |
| 1102 | * must have been set by a native authentication method (eg AIX or |
| 1103 | * SIA), so copy it to the child. |
| 1104 | */ |
| 1105 | { |
| 1106 | char *cp; |
| 1107 | |
| 1108 | if ((cp = getenv("KRB5CCNAME")) != NULL) |
| 1109 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); |
| 1110 | } |
| 1111 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1112 | #ifdef _AIX |
Ben Lindstrom | 839ac4f | 2002-02-24 20:42:46 +0000 | [diff] [blame] | 1113 | { |
| 1114 | char *cp; |
| 1115 | |
| 1116 | if ((cp = getenv("AUTHSTATE")) != NULL) |
| 1117 | child_set_env(&env, &envsize, "AUTHSTATE", cp); |
Ben Lindstrom | 839ac4f | 2002-02-24 20:42:46 +0000 | [diff] [blame] | 1118 | read_environment_file(&env, &envsize, "/etc/environment"); |
| 1119 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1120 | #endif |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 1121 | #ifdef KRB5 |
Damien Miller | 9c870f9 | 2004-04-16 22:47:55 +1000 | [diff] [blame] | 1122 | if (s->authctxt->krb5_ccname) |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 1123 | child_set_env(&env, &envsize, "KRB5CCNAME", |
Damien Miller | 9c870f9 | 2004-04-16 22:47:55 +1000 | [diff] [blame] | 1124 | s->authctxt->krb5_ccname); |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 1125 | #endif |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1126 | #ifdef USE_PAM |
Kevin Steves | 38b050a | 2002-07-23 00:44:07 +0000 | [diff] [blame] | 1127 | /* |
| 1128 | * Pull in any environment variables that may have |
| 1129 | * been set by PAM. |
| 1130 | */ |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 1131 | if (options.use_pam) { |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 1132 | char **p; |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 1133 | |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 1134 | p = fetch_pam_child_environment(); |
| 1135 | copy_environment(p, &env, &envsize); |
| 1136 | free_pam_environment(p); |
Kevin Steves | 38b050a | 2002-07-23 00:44:07 +0000 | [diff] [blame] | 1137 | |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 1138 | p = fetch_pam_environment(); |
Kevin Steves | 38b050a | 2002-07-23 00:44:07 +0000 | [diff] [blame] | 1139 | copy_environment(p, &env, &envsize); |
| 1140 | free_pam_environment(p); |
| 1141 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1142 | #endif /* USE_PAM */ |
| 1143 | |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 1144 | if (auth_sock_name != NULL) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1145 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 1146 | auth_sock_name); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1147 | |
| 1148 | /* read $HOME/.ssh/environment. */ |
Ben Lindstrom | 5d860f0 | 2002-08-01 01:28:38 +0000 | [diff] [blame] | 1149 | if (options.permit_user_env && !options.use_login) { |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 1150 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
Damien Miller | e9994cb | 2002-09-10 21:43:53 +1000 | [diff] [blame] | 1151 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1152 | read_environment_file(&env, &envsize, buf); |
| 1153 | } |
| 1154 | if (debug_flag) { |
| 1155 | /* dump the environment */ |
| 1156 | fprintf(stderr, "Environment:\n"); |
| 1157 | for (i = 0; env[i]; i++) |
| 1158 | fprintf(stderr, " %.200s\n", env[i]); |
| 1159 | } |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1160 | return env; |
| 1161 | } |
| 1162 | |
| 1163 | /* |
| 1164 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found |
| 1165 | * first in this order). |
| 1166 | */ |
| 1167 | static void |
| 1168 | do_rc_files(Session *s, const char *shell) |
| 1169 | { |
| 1170 | FILE *f = NULL; |
| 1171 | char cmd[1024]; |
| 1172 | int do_xauth; |
| 1173 | struct stat st; |
| 1174 | |
| 1175 | do_xauth = |
| 1176 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; |
| 1177 | |
| 1178 | /* ignore _PATH_SSH_USER_RC for subsystems */ |
| 1179 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { |
| 1180 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", |
| 1181 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); |
| 1182 | if (debug_flag) |
| 1183 | fprintf(stderr, "Running %s\n", cmd); |
| 1184 | f = popen(cmd, "w"); |
| 1185 | if (f) { |
| 1186 | if (do_xauth) |
| 1187 | fprintf(f, "%s %s\n", s->auth_proto, |
| 1188 | s->auth_data); |
| 1189 | pclose(f); |
| 1190 | } else |
| 1191 | fprintf(stderr, "Could not run %s\n", |
| 1192 | _PATH_SSH_USER_RC); |
| 1193 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { |
| 1194 | if (debug_flag) |
| 1195 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, |
| 1196 | _PATH_SSH_SYSTEM_RC); |
| 1197 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); |
| 1198 | if (f) { |
| 1199 | if (do_xauth) |
| 1200 | fprintf(f, "%s %s\n", s->auth_proto, |
| 1201 | s->auth_data); |
| 1202 | pclose(f); |
| 1203 | } else |
| 1204 | fprintf(stderr, "Could not run %s\n", |
| 1205 | _PATH_SSH_SYSTEM_RC); |
| 1206 | } else if (do_xauth && options.xauth_location != NULL) { |
| 1207 | /* Add authority data to .Xauthority if appropriate. */ |
| 1208 | if (debug_flag) { |
| 1209 | fprintf(stderr, |
Ben Lindstrom | 611797e | 2002-12-23 02:15:57 +0000 | [diff] [blame] | 1210 | "Running %.500s remove %.100s\n", |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 1211 | options.xauth_location, s->auth_display); |
Ben Lindstrom | 611797e | 2002-12-23 02:15:57 +0000 | [diff] [blame] | 1212 | fprintf(stderr, |
| 1213 | "%.500s add %.100s %.100s %.100s\n", |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1214 | options.xauth_location, s->auth_display, |
| 1215 | s->auth_proto, s->auth_data); |
| 1216 | } |
| 1217 | snprintf(cmd, sizeof cmd, "%s -q -", |
| 1218 | options.xauth_location); |
| 1219 | f = popen(cmd, "w"); |
| 1220 | if (f) { |
Ben Lindstrom | 611797e | 2002-12-23 02:15:57 +0000 | [diff] [blame] | 1221 | fprintf(f, "remove %s\n", |
| 1222 | s->auth_display); |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1223 | fprintf(f, "add %s %s %s\n", |
| 1224 | s->auth_display, s->auth_proto, |
| 1225 | s->auth_data); |
| 1226 | pclose(f); |
| 1227 | } else { |
| 1228 | fprintf(stderr, "Could not run %s\n", |
| 1229 | cmd); |
| 1230 | } |
| 1231 | } |
| 1232 | } |
| 1233 | |
| 1234 | static void |
| 1235 | do_nologin(struct passwd *pw) |
| 1236 | { |
| 1237 | FILE *f = NULL; |
| 1238 | char buf[1024]; |
| 1239 | |
| 1240 | #ifdef HAVE_LOGIN_CAP |
| 1241 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) |
| 1242 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, |
| 1243 | _PATH_NOLOGIN), "r"); |
| 1244 | #else |
| 1245 | if (pw->pw_uid) |
| 1246 | f = fopen(_PATH_NOLOGIN, "r"); |
| 1247 | #endif |
| 1248 | if (f) { |
| 1249 | /* /etc/nologin exists. Print its contents and exit. */ |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1250 | logit("User %.100s not allowed because %s exists", |
Damien Miller | a6eb2b7 | 2002-09-19 11:50:48 +1000 | [diff] [blame] | 1251 | pw->pw_name, _PATH_NOLOGIN); |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1252 | while (fgets(buf, sizeof(buf), f)) |
| 1253 | fputs(buf, stderr); |
| 1254 | fclose(f); |
Damien Miller | f25c18d | 2003-01-07 17:38:58 +1100 | [diff] [blame] | 1255 | fflush(NULL); |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1256 | exit(254); |
| 1257 | } |
| 1258 | } |
| 1259 | |
| 1260 | /* Set login name, uid, gid, and groups. */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1261 | void |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1262 | do_setusercontext(struct passwd *pw) |
| 1263 | { |
Damien Miller | 1a3ccb0 | 2003-02-24 13:04:01 +1100 | [diff] [blame] | 1264 | #ifndef HAVE_CYGWIN |
| 1265 | if (getuid() == 0 || geteuid() == 0) |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1266 | #endif /* HAVE_CYGWIN */ |
Damien Miller | 1a3ccb0 | 2003-02-24 13:04:01 +1100 | [diff] [blame] | 1267 | { |
| 1268 | |
Ben Lindstrom | f0bfa83 | 2002-06-21 00:01:18 +0000 | [diff] [blame] | 1269 | #ifdef HAVE_SETPCRED |
Darren Tucker | 793e817 | 2003-07-08 21:01:04 +1000 | [diff] [blame] | 1270 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
| 1271 | fatal("Failed to set process credentials"); |
Ben Lindstrom | f0bfa83 | 2002-06-21 00:01:18 +0000 | [diff] [blame] | 1272 | #endif /* HAVE_SETPCRED */ |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1273 | #ifdef HAVE_LOGIN_CAP |
Ben Lindstrom | 938b828 | 2002-07-15 17:58:34 +0000 | [diff] [blame] | 1274 | # ifdef __bsdi__ |
Damien Miller | f18cd16 | 2002-06-26 19:12:59 +1000 | [diff] [blame] | 1275 | setpgid(0, 0); |
Ben Lindstrom | 938b828 | 2002-07-15 17:58:34 +0000 | [diff] [blame] | 1276 | # endif |
Darren Tucker | c97b01a | 2005-02-16 16:47:37 +1100 | [diff] [blame] | 1277 | #ifdef GSSAPI |
| 1278 | if (options.gss_authentication) { |
| 1279 | temporarily_use_uid(pw); |
| 1280 | ssh_gssapi_storecreds(); |
| 1281 | restore_uid(); |
| 1282 | } |
| 1283 | #endif |
Damien Miller | d352636 | 2004-01-23 14:16:26 +1100 | [diff] [blame] | 1284 | # ifdef USE_PAM |
| 1285 | if (options.use_pam) { |
| 1286 | do_pam_session(); |
| 1287 | do_pam_setcred(0); |
| 1288 | } |
| 1289 | # endif /* USE_PAM */ |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1290 | if (setusercontext(lc, pw, pw->pw_uid, |
| 1291 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { |
| 1292 | perror("unable to set user context"); |
| 1293 | exit(1); |
| 1294 | } |
| 1295 | #else |
| 1296 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) |
| 1297 | /* Sets login uid for accounting */ |
| 1298 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) |
| 1299 | error("setluid: %s", strerror(errno)); |
| 1300 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ |
| 1301 | |
| 1302 | if (setlogin(pw->pw_name) < 0) |
| 1303 | error("setlogin failed: %s", strerror(errno)); |
| 1304 | if (setgid(pw->pw_gid) < 0) { |
| 1305 | perror("setgid"); |
| 1306 | exit(1); |
| 1307 | } |
| 1308 | /* Initialize the group list. */ |
| 1309 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { |
| 1310 | perror("initgroups"); |
| 1311 | exit(1); |
| 1312 | } |
| 1313 | endgrent(); |
Darren Tucker | c97b01a | 2005-02-16 16:47:37 +1100 | [diff] [blame] | 1314 | #ifdef GSSAPI |
| 1315 | if (options.gss_authentication) { |
| 1316 | temporarily_use_uid(pw); |
| 1317 | ssh_gssapi_storecreds(); |
| 1318 | restore_uid(); |
| 1319 | } |
| 1320 | #endif |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1321 | # ifdef USE_PAM |
| 1322 | /* |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 1323 | * PAM credentials may take the form of supplementary groups. |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1324 | * These will have been wiped by the above initgroups() call. |
| 1325 | * Reestablish them here. |
| 1326 | */ |
Damien Miller | 341c6e6 | 2003-09-02 23:18:52 +1000 | [diff] [blame] | 1327 | if (options.use_pam) { |
| 1328 | do_pam_session(); |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 1329 | do_pam_setcred(0); |
Damien Miller | 341c6e6 | 2003-09-02 23:18:52 +1000 | [diff] [blame] | 1330 | } |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1331 | # endif /* USE_PAM */ |
| 1332 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) |
| 1333 | irix_setusercontext(pw); |
| 1334 | # endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */ |
Ben Lindstrom | b129be6 | 2002-06-25 17:12:26 +0000 | [diff] [blame] | 1335 | # ifdef _AIX |
Ben Lindstrom | 51b2488 | 2002-07-04 03:08:40 +0000 | [diff] [blame] | 1336 | aix_usrinfo(pw); |
Ben Lindstrom | b129be6 | 2002-06-25 17:12:26 +0000 | [diff] [blame] | 1337 | # endif /* _AIX */ |
Tim Rice | 66fd217 | 2005-08-31 09:59:49 -0700 | [diff] [blame] | 1338 | #if defined(HAVE_LIBIAF) && !defined(BROKEN_LIBIAF) |
Tim Rice | 2291c00 | 2005-08-26 13:15:19 -0700 | [diff] [blame] | 1339 | if (set_id(pw->pw_name) != 0) { |
| 1340 | exit(1); |
| 1341 | } |
Tim Rice | 66fd217 | 2005-08-31 09:59:49 -0700 | [diff] [blame] | 1342 | #endif /* HAVE_LIBIAF && !BROKEN_LIBIAF */ |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1343 | /* Permanently switch to the desired uid. */ |
| 1344 | permanently_set_uid(pw); |
| 1345 | #endif |
| 1346 | } |
Damien Miller | 1a3ccb0 | 2003-02-24 13:04:01 +1100 | [diff] [blame] | 1347 | |
| 1348 | #ifdef HAVE_CYGWIN |
| 1349 | if (is_winnt) |
| 1350 | #endif |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1351 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
| 1352 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); |
| 1353 | } |
| 1354 | |
Ben Lindstrom | 0810519 | 2002-03-22 02:50:06 +0000 | [diff] [blame] | 1355 | static void |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1356 | do_pwchange(Session *s) |
| 1357 | { |
Darren Tucker | 0999174 | 2004-07-17 17:05:14 +1000 | [diff] [blame] | 1358 | fflush(NULL); |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1359 | fprintf(stderr, "WARNING: Your password has expired.\n"); |
| 1360 | if (s->ttyfd != -1) { |
Darren Tucker | fc95970 | 2004-07-17 16:12:08 +1000 | [diff] [blame] | 1361 | fprintf(stderr, |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1362 | "You must change your password now and login again!\n"); |
Darren Tucker | 33370e0 | 2005-02-09 22:17:28 +1100 | [diff] [blame] | 1363 | #ifdef PASSWD_NEEDS_USERNAME |
| 1364 | execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name, |
| 1365 | (char *)NULL); |
| 1366 | #else |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1367 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); |
Darren Tucker | 33370e0 | 2005-02-09 22:17:28 +1100 | [diff] [blame] | 1368 | #endif |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1369 | perror("passwd"); |
| 1370 | } else { |
| 1371 | fprintf(stderr, |
| 1372 | "Password change required but no TTY available.\n"); |
| 1373 | } |
| 1374 | exit(1); |
| 1375 | } |
| 1376 | |
| 1377 | static void |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1378 | launch_login(struct passwd *pw, const char *hostname) |
| 1379 | { |
| 1380 | /* Launch login(1). */ |
| 1381 | |
Ben Lindstrom | 378a417 | 2002-06-07 14:49:56 +0000 | [diff] [blame] | 1382 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
Kevin Steves | b4799a3 | 2002-03-24 23:19:54 +0000 | [diff] [blame] | 1383 | #ifdef xxxLOGIN_NEEDS_TERM |
Ben Lindstrom | 5a6abda | 2002-06-09 19:41:48 +0000 | [diff] [blame] | 1384 | (s->term ? s->term : "unknown"), |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1385 | #endif /* LOGIN_NEEDS_TERM */ |
Kevin Steves | 5feaaef | 2002-04-23 20:45:55 +0000 | [diff] [blame] | 1386 | #ifdef LOGIN_NO_ENDOPT |
| 1387 | "-p", "-f", pw->pw_name, (char *)NULL); |
| 1388 | #else |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1389 | "-p", "-f", "--", pw->pw_name, (char *)NULL); |
Kevin Steves | 5feaaef | 2002-04-23 20:45:55 +0000 | [diff] [blame] | 1390 | #endif |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1391 | |
| 1392 | /* Login couldn't be executed, die. */ |
| 1393 | |
| 1394 | perror("login"); |
| 1395 | exit(1); |
| 1396 | } |
| 1397 | |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1398 | static void |
| 1399 | child_close_fds(void) |
| 1400 | { |
| 1401 | int i; |
| 1402 | |
| 1403 | if (packet_get_connection_in() == packet_get_connection_out()) |
| 1404 | close(packet_get_connection_in()); |
| 1405 | else { |
| 1406 | close(packet_get_connection_in()); |
| 1407 | close(packet_get_connection_out()); |
| 1408 | } |
| 1409 | /* |
| 1410 | * Close all descriptors related to channels. They will still remain |
| 1411 | * open in the parent. |
| 1412 | */ |
| 1413 | /* XXX better use close-on-exec? -markus */ |
| 1414 | channel_close_all(); |
| 1415 | |
| 1416 | /* |
| 1417 | * Close any extra file descriptors. Note that there may still be |
| 1418 | * descriptors left by system functions. They will be closed later. |
| 1419 | */ |
| 1420 | endpwent(); |
| 1421 | |
| 1422 | /* |
Damien Miller | 788f212 | 2005-11-05 15:14:59 +1100 | [diff] [blame] | 1423 | * 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] | 1424 | * hanging around in clients. Note that we want to do this after |
| 1425 | * initgroups, because at least on Solaris 2.3 it leaves file |
| 1426 | * descriptors open. |
| 1427 | */ |
| 1428 | for (i = 3; i < 64; i++) |
| 1429 | close(i); |
| 1430 | } |
| 1431 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1432 | /* |
| 1433 | * Performs common processing for the child, such as setting up the |
| 1434 | * environment, closing extra file descriptors, setting the user and group |
| 1435 | * ids, and executing the command or shell. |
| 1436 | */ |
| 1437 | void |
| 1438 | do_child(Session *s, const char *command) |
| 1439 | { |
| 1440 | extern char **environ; |
| 1441 | char **env; |
| 1442 | char *argv[10]; |
| 1443 | const char *shell, *shell0, *hostname = NULL; |
| 1444 | struct passwd *pw = s->pw; |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1445 | |
| 1446 | /* remove hostkey from the child's memory */ |
| 1447 | destroy_sensitive_data(); |
| 1448 | |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1449 | /* Force a password change */ |
| 1450 | if (s->authctxt->force_pwchange) { |
| 1451 | do_setusercontext(pw); |
| 1452 | child_close_fds(); |
| 1453 | do_pwchange(s); |
| 1454 | exit(1); |
| 1455 | } |
| 1456 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1457 | /* login(1) is only called if we execute the login shell */ |
| 1458 | if (options.use_login && command != NULL) |
| 1459 | options.use_login = 0; |
| 1460 | |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 1461 | #ifdef _UNICOS |
| 1462 | cray_setup(pw->pw_uid, pw->pw_name, command); |
| 1463 | #endif /* _UNICOS */ |
| 1464 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1465 | /* |
| 1466 | * Login(1) does this as well, and it needs uid 0 for the "-h" |
| 1467 | * switch, so we let login(1) to this for us. |
| 1468 | */ |
| 1469 | if (!options.use_login) { |
| 1470 | #ifdef HAVE_OSF_SIA |
Ben Lindstrom | c8c548d | 2003-03-21 01:18:09 +0000 | [diff] [blame] | 1471 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1472 | if (!check_quietlogin(s, command)) |
| 1473 | do_motd(); |
| 1474 | #else /* HAVE_OSF_SIA */ |
Darren Tucker | 42308a4 | 2005-10-30 15:31:55 +1100 | [diff] [blame] | 1475 | /* When PAM is enabled we rely on it to do the nologin check */ |
| 1476 | if (!options.use_pam) |
| 1477 | do_nologin(pw); |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1478 | do_setusercontext(pw); |
Darren Tucker | 0a44d1e | 2004-07-01 09:48:29 +1000 | [diff] [blame] | 1479 | /* |
| 1480 | * PAM session modules in do_setusercontext may have |
| 1481 | * generated messages, so if this in an interactive |
| 1482 | * login then display them too. |
| 1483 | */ |
Darren Tucker | a2a3ed0 | 2004-09-11 23:09:53 +1000 | [diff] [blame] | 1484 | if (!check_quietlogin(s, command)) |
Darren Tucker | 0a44d1e | 2004-07-01 09:48:29 +1000 | [diff] [blame] | 1485 | display_loginmsg(); |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1486 | #endif /* HAVE_OSF_SIA */ |
| 1487 | } |
| 1488 | |
Darren Tucker | 69687f4 | 2004-09-11 22:17:26 +1000 | [diff] [blame] | 1489 | #ifdef USE_PAM |
Darren Tucker | 4855415 | 2005-04-21 19:50:55 +1000 | [diff] [blame] | 1490 | if (options.use_pam && !options.use_login && !is_pam_session_open()) { |
| 1491 | debug3("PAM session not opened, exiting"); |
Darren Tucker | 69687f4 | 2004-09-11 22:17:26 +1000 | [diff] [blame] | 1492 | display_loginmsg(); |
| 1493 | exit(254); |
| 1494 | } |
| 1495 | #endif |
| 1496 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1497 | /* |
| 1498 | * Get the shell from the password data. An empty shell field is |
| 1499 | * legal, and means /bin/sh. |
| 1500 | */ |
| 1501 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; |
Ben Lindstrom | 4676760 | 2002-12-23 02:26:08 +0000 | [diff] [blame] | 1502 | |
| 1503 | /* |
| 1504 | * Make sure $SHELL points to the shell from the password file, |
| 1505 | * even if shell is overridden from login.conf |
| 1506 | */ |
| 1507 | env = do_setup_env(s, shell); |
| 1508 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1509 | #ifdef HAVE_LOGIN_CAP |
| 1510 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); |
| 1511 | #endif |
| 1512 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1513 | /* we have to stash the hostname before we close our socket. */ |
| 1514 | if (options.use_login) |
Ben Lindstrom | f15a386 | 2001-04-05 23:32:17 +0000 | [diff] [blame] | 1515 | hostname = get_remote_name_or_ip(utmp_len, |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 1516 | options.use_dns); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1517 | /* |
| 1518 | * Close the connection descriptors; note that this is the child, and |
| 1519 | * the server will still have the socket open, and it is important |
| 1520 | * that we do not shutdown it. Note that the descriptors cannot be |
| 1521 | * closed before building the environment, as we call |
| 1522 | * get_remote_ipaddr there. |
| 1523 | */ |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1524 | child_close_fds(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1525 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1526 | /* |
Damien Miller | 05eda43 | 2002-02-10 18:32:28 +1100 | [diff] [blame] | 1527 | * Must take new environment into use so that .ssh/rc, |
| 1528 | * /etc/ssh/sshrc and xauth are run in the proper environment. |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1529 | */ |
| 1530 | environ = env; |
| 1531 | |
Darren Tucker | 3c78c5e | 2004-01-23 22:03:10 +1100 | [diff] [blame] | 1532 | #if defined(KRB5) && defined(USE_AFS) |
Darren Tucker | 22ef508 | 2003-12-31 11:37:34 +1100 | [diff] [blame] | 1533 | /* |
| 1534 | * At this point, we check to see if AFS is active and if we have |
| 1535 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see |
| 1536 | * if we can (and need to) extend the ticket into an AFS token. If |
| 1537 | * we don't do this, we run into potential problems if the user's |
| 1538 | * home directory is in AFS and it's not world-readable. |
| 1539 | */ |
| 1540 | |
| 1541 | if (options.kerberos_get_afs_token && k_hasafs() && |
Damien Miller | 0dc1bef | 2005-07-17 17:22:45 +1000 | [diff] [blame] | 1542 | (s->authctxt->krb5_ctx != NULL)) { |
Darren Tucker | 22ef508 | 2003-12-31 11:37:34 +1100 | [diff] [blame] | 1543 | char cell[64]; |
| 1544 | |
| 1545 | debug("Getting AFS token"); |
| 1546 | |
| 1547 | k_setpag(); |
| 1548 | |
| 1549 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) |
| 1550 | krb5_afslog(s->authctxt->krb5_ctx, |
| 1551 | s->authctxt->krb5_fwd_ccache, cell, NULL); |
| 1552 | |
| 1553 | krb5_afslog_home(s->authctxt->krb5_ctx, |
| 1554 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); |
| 1555 | } |
| 1556 | #endif |
| 1557 | |
Damien Miller | 788f212 | 2005-11-05 15:14:59 +1100 | [diff] [blame] | 1558 | /* Change current directory to the user's home directory. */ |
Damien Miller | 139d4cd | 2001-10-10 15:07:44 +1000 | [diff] [blame] | 1559 | if (chdir(pw->pw_dir) < 0) { |
| 1560 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", |
| 1561 | pw->pw_dir, strerror(errno)); |
| 1562 | #ifdef HAVE_LOGIN_CAP |
| 1563 | if (login_getcapbool(lc, "requirehome", 0)) |
| 1564 | exit(1); |
| 1565 | #endif |
| 1566 | } |
| 1567 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1568 | if (!options.use_login) |
| 1569 | do_rc_files(s, shell); |
Ben Lindstrom | de71cda | 2001-03-24 00:43:26 +0000 | [diff] [blame] | 1570 | |
| 1571 | /* restore SIGPIPE for child */ |
| 1572 | signal(SIGPIPE, SIG_DFL); |
| 1573 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1574 | if (options.use_login) { |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1575 | launch_login(pw, hostname); |
| 1576 | /* NEVERREACHED */ |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1577 | } |
| 1578 | |
| 1579 | /* Get the last component of the shell name. */ |
| 1580 | if ((shell0 = strrchr(shell, '/')) != NULL) |
| 1581 | shell0++; |
| 1582 | else |
| 1583 | shell0 = shell; |
| 1584 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1585 | /* |
| 1586 | * If we have no command, execute the shell. In this case, the shell |
| 1587 | * name to be passed in argv[0] is preceded by '-' to indicate that |
| 1588 | * this is a login shell. |
| 1589 | */ |
| 1590 | if (!command) { |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1591 | char argv0[256]; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1592 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1593 | /* Start the shell. Set initial character to '-'. */ |
| 1594 | argv0[0] = '-'; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1595 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1596 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
| 1597 | >= sizeof(argv0) - 1) { |
| 1598 | errno = EINVAL; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1599 | perror(shell); |
| 1600 | exit(1); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1601 | } |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1602 | |
| 1603 | /* Execute the shell. */ |
| 1604 | argv[0] = argv0; |
| 1605 | argv[1] = NULL; |
| 1606 | execve(shell, argv, env); |
| 1607 | |
| 1608 | /* Executing the shell failed. */ |
| 1609 | perror(shell); |
| 1610 | exit(1); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1611 | } |
| 1612 | /* |
| 1613 | * Execute the command using the user's shell. This uses the -c |
| 1614 | * option to execute the command. |
| 1615 | */ |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1616 | argv[0] = (char *) shell0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1617 | argv[1] = "-c"; |
| 1618 | argv[2] = (char *) command; |
| 1619 | argv[3] = NULL; |
| 1620 | execve(shell, argv, env); |
| 1621 | perror(shell); |
| 1622 | exit(1); |
| 1623 | } |
| 1624 | |
| 1625 | Session * |
| 1626 | session_new(void) |
| 1627 | { |
| 1628 | int i; |
| 1629 | static int did_init = 0; |
| 1630 | if (!did_init) { |
| 1631 | debug("session_new: init"); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1632 | for (i = 0; i < MAX_SESSIONS; i++) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1633 | sessions[i].used = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1634 | } |
| 1635 | did_init = 1; |
| 1636 | } |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1637 | for (i = 0; i < MAX_SESSIONS; i++) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1638 | Session *s = &sessions[i]; |
| 1639 | if (! s->used) { |
Ben Lindstrom | 6029432 | 2001-03-26 05:38:25 +0000 | [diff] [blame] | 1640 | memset(s, 0, sizeof(*s)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1641 | s->chanid = -1; |
| 1642 | s->ptyfd = -1; |
| 1643 | s->ttyfd = -1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1644 | s->used = 1; |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 1645 | s->self = i; |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 1646 | s->x11_chanids = NULL; |
Damien Miller | 15b2952 | 2000-10-14 12:33:48 +1100 | [diff] [blame] | 1647 | debug("session_new: session %d", i); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1648 | return s; |
| 1649 | } |
| 1650 | } |
| 1651 | return NULL; |
| 1652 | } |
| 1653 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1654 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1655 | session_dump(void) |
| 1656 | { |
| 1657 | int i; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1658 | for (i = 0; i < MAX_SESSIONS; i++) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1659 | Session *s = &sessions[i]; |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 1660 | debug("dump: used %d session %d %p channel %d pid %ld", |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1661 | s->used, |
| 1662 | s->self, |
| 1663 | s, |
| 1664 | s->chanid, |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 1665 | (long)s->pid); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1666 | } |
| 1667 | } |
| 1668 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1669 | int |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 1670 | session_open(Authctxt *authctxt, int chanid) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1671 | { |
| 1672 | Session *s = session_new(); |
| 1673 | debug("session_open: channel %d", chanid); |
| 1674 | if (s == NULL) { |
| 1675 | error("no more sessions"); |
| 1676 | return 0; |
| 1677 | } |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 1678 | s->authctxt = authctxt; |
| 1679 | s->pw = authctxt->pw; |
Damien Miller | 3e3b514 | 2003-11-17 21:13:40 +1100 | [diff] [blame] | 1680 | if (s->pw == NULL || !authctxt->valid) |
Kevin Steves | 43cdef3 | 2001-02-11 14:12:08 +0000 | [diff] [blame] | 1681 | fatal("no user for session %d", s->self); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1682 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
| 1683 | s->chanid = chanid; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1684 | return 1; |
| 1685 | } |
| 1686 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1687 | Session * |
| 1688 | session_by_tty(char *tty) |
| 1689 | { |
| 1690 | int i; |
| 1691 | for (i = 0; i < MAX_SESSIONS; i++) { |
| 1692 | Session *s = &sessions[i]; |
| 1693 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { |
| 1694 | debug("session_by_tty: session %d tty %s", i, tty); |
| 1695 | return s; |
| 1696 | } |
| 1697 | } |
| 1698 | debug("session_by_tty: unknown tty %.100s", tty); |
| 1699 | session_dump(); |
| 1700 | return NULL; |
| 1701 | } |
| 1702 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1703 | static Session * |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1704 | session_by_channel(int id) |
| 1705 | { |
| 1706 | int i; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1707 | for (i = 0; i < MAX_SESSIONS; i++) { |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1708 | Session *s = &sessions[i]; |
| 1709 | if (s->used && s->chanid == id) { |
| 1710 | debug("session_by_channel: session %d channel %d", i, id); |
| 1711 | return s; |
| 1712 | } |
| 1713 | } |
| 1714 | debug("session_by_channel: unknown channel %d", id); |
| 1715 | session_dump(); |
| 1716 | return NULL; |
| 1717 | } |
| 1718 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1719 | static Session * |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 1720 | session_by_x11_channel(int id) |
| 1721 | { |
| 1722 | int i, j; |
| 1723 | |
| 1724 | for (i = 0; i < MAX_SESSIONS; i++) { |
| 1725 | Session *s = &sessions[i]; |
| 1726 | |
| 1727 | if (s->x11_chanids == NULL || !s->used) |
| 1728 | continue; |
| 1729 | for (j = 0; s->x11_chanids[j] != -1; j++) { |
| 1730 | if (s->x11_chanids[j] == id) { |
| 1731 | debug("session_by_x11_channel: session %d " |
| 1732 | "channel %d", s->self, id); |
| 1733 | return s; |
| 1734 | } |
| 1735 | } |
| 1736 | } |
| 1737 | debug("session_by_x11_channel: unknown channel %d", id); |
| 1738 | session_dump(); |
| 1739 | return NULL; |
| 1740 | } |
| 1741 | |
| 1742 | static Session * |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1743 | session_by_pid(pid_t pid) |
| 1744 | { |
| 1745 | int i; |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 1746 | debug("session_by_pid: pid %ld", (long)pid); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1747 | for (i = 0; i < MAX_SESSIONS; i++) { |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1748 | Session *s = &sessions[i]; |
| 1749 | if (s->used && s->pid == pid) |
| 1750 | return s; |
| 1751 | } |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 1752 | error("session_by_pid: unknown pid %ld", (long)pid); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1753 | session_dump(); |
| 1754 | return NULL; |
| 1755 | } |
| 1756 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1757 | static int |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1758 | session_window_change_req(Session *s) |
| 1759 | { |
| 1760 | s->col = packet_get_int(); |
| 1761 | s->row = packet_get_int(); |
| 1762 | s->xpixel = packet_get_int(); |
| 1763 | s->ypixel = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1764 | packet_check_eom(); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1765 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
| 1766 | return 1; |
| 1767 | } |
| 1768 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1769 | static int |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1770 | session_pty_req(Session *s) |
| 1771 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1772 | u_int len; |
Ben Lindstrom | ae8e2d3 | 2001-04-14 23:13:02 +0000 | [diff] [blame] | 1773 | int n_bytes; |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 1774 | |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1775 | if (no_pty_flag) { |
| 1776 | debug("Allocating a pty not permitted for this authentication."); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1777 | return 0; |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1778 | } |
| 1779 | if (s->ttyfd != -1) { |
| 1780 | packet_disconnect("Protocol error: you already have a pty."); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1781 | return 0; |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1782 | } |
| 1783 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1784 | s->term = packet_get_string(&len); |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1785 | |
| 1786 | if (compat20) { |
| 1787 | s->col = packet_get_int(); |
| 1788 | s->row = packet_get_int(); |
| 1789 | } else { |
| 1790 | s->row = packet_get_int(); |
| 1791 | s->col = packet_get_int(); |
| 1792 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1793 | s->xpixel = packet_get_int(); |
| 1794 | s->ypixel = packet_get_int(); |
| 1795 | |
| 1796 | if (strcmp(s->term, "") == 0) { |
| 1797 | xfree(s->term); |
| 1798 | s->term = NULL; |
| 1799 | } |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1800 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1801 | /* Allocate a pty and open it. */ |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1802 | debug("Allocating pty."); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1803 | if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty)))) { |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1804 | if (s->term) |
| 1805 | xfree(s->term); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1806 | s->term = NULL; |
| 1807 | s->ptyfd = -1; |
| 1808 | s->ttyfd = -1; |
| 1809 | error("session_pty_req: session %d alloc failed", s->self); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1810 | return 0; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1811 | } |
| 1812 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1813 | |
| 1814 | /* for SSH1 the tty modes length is not given */ |
| 1815 | if (!compat20) |
| 1816 | n_bytes = packet_remaining(); |
| 1817 | tty_parse_modes(s->ttyfd, &n_bytes); |
| 1818 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1819 | if (!use_privsep) |
| 1820 | pty_setowner(s->pw, s->tty); |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1821 | |
| 1822 | /* Set window size from the packet. */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1823 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
| 1824 | |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1825 | packet_check_eom(); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 1826 | session_proctitle(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1827 | return 1; |
| 1828 | } |
| 1829 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1830 | static int |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1831 | session_subsystem_req(Session *s) |
| 1832 | { |
Damien Miller | ae45246 | 2001-10-10 15:08:06 +1000 | [diff] [blame] | 1833 | struct stat st; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1834 | u_int len; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1835 | int success = 0; |
Damien Miller | ae45246 | 2001-10-10 15:08:06 +1000 | [diff] [blame] | 1836 | char *cmd, *subsys = packet_get_string(&len); |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 1837 | u_int i; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1838 | |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1839 | packet_check_eom(); |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1840 | logit("subsystem request for %.100s", subsys); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1841 | |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1842 | for (i = 0; i < options.num_subsystems; i++) { |
Damien Miller | ae45246 | 2001-10-10 15:08:06 +1000 | [diff] [blame] | 1843 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { |
| 1844 | cmd = options.subsystem_command[i]; |
| 1845 | if (stat(cmd, &st) < 0) { |
| 1846 | error("subsystem: cannot stat %s: %s", cmd, |
| 1847 | strerror(errno)); |
| 1848 | break; |
| 1849 | } |
| 1850 | debug("subsystem: exec() %s", cmd); |
Ben Lindstrom | fc9b07d | 2001-03-22 01:27:23 +0000 | [diff] [blame] | 1851 | s->is_subsystem = 1; |
Damien Miller | ae45246 | 2001-10-10 15:08:06 +1000 | [diff] [blame] | 1852 | do_exec(s, cmd); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1853 | success = 1; |
Damien Miller | 5fab4b9 | 2002-02-05 12:15:07 +1100 | [diff] [blame] | 1854 | break; |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1855 | } |
| 1856 | } |
| 1857 | |
| 1858 | if (!success) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1859 | logit("subsystem request for %.100s failed, subsystem not found", |
Damien Miller | ae45246 | 2001-10-10 15:08:06 +1000 | [diff] [blame] | 1860 | subsys); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1861 | |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1862 | xfree(subsys); |
| 1863 | return success; |
| 1864 | } |
| 1865 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1866 | static int |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1867 | session_x11_req(Session *s) |
| 1868 | { |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 1869 | int success; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1870 | |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 1871 | if (s->auth_proto != NULL || s->auth_data != NULL) { |
| 1872 | error("session_x11_req: session %d: " |
Darren Tucker | 6355187 | 2005-12-20 16:14:15 +1100 | [diff] [blame] | 1873 | "x11 forwarding already active", s->self); |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 1874 | return 0; |
| 1875 | } |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1876 | s->single_connection = packet_get_char(); |
| 1877 | s->auth_proto = packet_get_string(NULL); |
| 1878 | s->auth_data = packet_get_string(NULL); |
| 1879 | s->screen = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1880 | packet_check_eom(); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1881 | |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 1882 | success = session_setup_x11fwd(s); |
| 1883 | if (!success) { |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1884 | xfree(s->auth_proto); |
| 1885 | xfree(s->auth_data); |
Ben Lindstrom | 88259fb | 2001-06-12 00:21:34 +0000 | [diff] [blame] | 1886 | s->auth_proto = NULL; |
| 1887 | s->auth_data = NULL; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1888 | } |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 1889 | return success; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1890 | } |
| 1891 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1892 | static int |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1893 | session_shell_req(Session *s) |
| 1894 | { |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1895 | packet_check_eom(); |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 1896 | do_exec(s, NULL); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1897 | return 1; |
| 1898 | } |
| 1899 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1900 | static int |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1901 | session_exec_req(Session *s) |
| 1902 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1903 | u_int len; |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1904 | char *command = packet_get_string(&len); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1905 | packet_check_eom(); |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 1906 | do_exec(s, command); |
Ben Lindstrom | 0a7ca6c | 2001-06-21 03:17:42 +0000 | [diff] [blame] | 1907 | xfree(command); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1908 | return 1; |
| 1909 | } |
| 1910 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1911 | static int |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 1912 | session_break_req(Session *s) |
| 1913 | { |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 1914 | |
Darren Tucker | 1f8311c | 2004-05-13 16:39:33 +1000 | [diff] [blame] | 1915 | packet_get_int(); /* ignored */ |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 1916 | packet_check_eom(); |
| 1917 | |
Darren Tucker | 3bdbd84 | 2003-08-13 20:31:05 +1000 | [diff] [blame] | 1918 | if (s->ttyfd == -1 || |
| 1919 | tcsendbreak(s->ttyfd, 0) < 0) |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 1920 | return 0; |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 1921 | return 1; |
| 1922 | } |
| 1923 | |
| 1924 | static int |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 1925 | session_env_req(Session *s) |
| 1926 | { |
| 1927 | char *name, *val; |
| 1928 | u_int name_len, val_len, i; |
| 1929 | |
| 1930 | name = packet_get_string(&name_len); |
| 1931 | val = packet_get_string(&val_len); |
| 1932 | packet_check_eom(); |
| 1933 | |
| 1934 | /* Don't set too many environment variables */ |
| 1935 | if (s->num_env > 128) { |
| 1936 | debug2("Ignoring env request %s: too many env vars", name); |
| 1937 | goto fail; |
| 1938 | } |
| 1939 | |
| 1940 | for (i = 0; i < options.num_accept_env; i++) { |
| 1941 | if (match_pattern(name, options.accept_env[i])) { |
| 1942 | debug2("Setting env %d: %s=%s", s->num_env, name, val); |
| 1943 | s->env = xrealloc(s->env, sizeof(*s->env) * |
| 1944 | (s->num_env + 1)); |
| 1945 | s->env[s->num_env].name = name; |
| 1946 | s->env[s->num_env].val = val; |
| 1947 | s->num_env++; |
| 1948 | return (1); |
| 1949 | } |
| 1950 | } |
| 1951 | debug2("Ignoring env request %s: disallowed name", name); |
| 1952 | |
| 1953 | fail: |
| 1954 | xfree(name); |
| 1955 | xfree(val); |
| 1956 | return (0); |
| 1957 | } |
| 1958 | |
| 1959 | static int |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1960 | session_auth_agent_req(Session *s) |
| 1961 | { |
| 1962 | static int called = 0; |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1963 | packet_check_eom(); |
Ben Lindstrom | 1492029 | 2000-11-21 21:24:55 +0000 | [diff] [blame] | 1964 | if (no_agent_forwarding_flag) { |
| 1965 | debug("session_auth_agent_req: no_agent_forwarding_flag"); |
| 1966 | return 0; |
| 1967 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1968 | if (called) { |
| 1969 | return 0; |
| 1970 | } else { |
| 1971 | called = 1; |
| 1972 | return auth_input_request_forwarding(s->pw); |
| 1973 | } |
| 1974 | } |
| 1975 | |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1976 | int |
| 1977 | session_input_channel_req(Channel *c, const char *rtype) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1978 | { |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1979 | int success = 0; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1980 | Session *s; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1981 | |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1982 | if ((s = session_by_channel(c->self)) == NULL) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1983 | logit("session_input_channel_req: no session %d req %.100s", |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1984 | c->self, rtype); |
| 1985 | return 0; |
| 1986 | } |
| 1987 | debug("session_input_channel_req: session %d req %s", s->self, rtype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1988 | |
| 1989 | /* |
Ben Lindstrom | fc9b07d | 2001-03-22 01:27:23 +0000 | [diff] [blame] | 1990 | * a session is in LARVAL state until a shell, a command |
| 1991 | * or a subsystem is executed |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1992 | */ |
| 1993 | if (c->type == SSH_CHANNEL_LARVAL) { |
| 1994 | if (strcmp(rtype, "shell") == 0) { |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1995 | success = session_shell_req(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1996 | } else if (strcmp(rtype, "exec") == 0) { |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1997 | success = session_exec_req(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1998 | } else if (strcmp(rtype, "pty-req") == 0) { |
Damien Miller | 5f05637 | 2000-04-16 12:31:48 +1000 | [diff] [blame] | 1999 | success = session_pty_req(s); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2000 | } else if (strcmp(rtype, "x11-req") == 0) { |
| 2001 | success = session_x11_req(s); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 2002 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
| 2003 | success = session_auth_agent_req(s); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2004 | } else if (strcmp(rtype, "subsystem") == 0) { |
| 2005 | success = session_subsystem_req(s); |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 2006 | } else if (strcmp(rtype, "env") == 0) { |
| 2007 | success = session_env_req(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2008 | } |
| 2009 | } |
| 2010 | if (strcmp(rtype, "window-change") == 0) { |
| 2011 | success = session_window_change_req(s); |
Damien Miller | a6b1d16 | 2004-06-30 22:41:07 +1000 | [diff] [blame] | 2012 | } else if (strcmp(rtype, "break") == 0) { |
| 2013 | success = session_break_req(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2014 | } |
Damien Miller | a6b1d16 | 2004-06-30 22:41:07 +1000 | [diff] [blame] | 2015 | |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 2016 | return success; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2017 | } |
| 2018 | |
| 2019 | void |
| 2020 | session_set_fds(Session *s, int fdin, int fdout, int fderr) |
| 2021 | { |
| 2022 | if (!compat20) |
| 2023 | fatal("session_set_fds: called for proto != 2.0"); |
| 2024 | /* |
| 2025 | * now that have a child and a pipe to the child, |
| 2026 | * we can activate our channel and register the fd's |
| 2027 | */ |
| 2028 | if (s->chanid == -1) |
| 2029 | fatal("no channel for session %d", s->self); |
| 2030 | channel_set_fds(s->chanid, |
| 2031 | fdout, fdin, fderr, |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 2032 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
Damien Miller | 19a5945 | 2002-02-19 15:20:57 +1100 | [diff] [blame] | 2033 | 1, |
| 2034 | CHAN_SES_WINDOW_DEFAULT); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2035 | } |
| 2036 | |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 2037 | /* |
| 2038 | * Function to perform pty cleanup. Also called if we get aborted abnormally |
| 2039 | * (e.g., due to a dropped connection). |
| 2040 | */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2041 | void |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2042 | session_pty_cleanup2(Session *s) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2043 | { |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 2044 | if (s == NULL) { |
| 2045 | error("session_pty_cleanup: no session"); |
| 2046 | return; |
| 2047 | } |
| 2048 | if (s->ttyfd == -1) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2049 | return; |
| 2050 | |
Kevin Steves | 43cdef3 | 2001-02-11 14:12:08 +0000 | [diff] [blame] | 2051 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2052 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2053 | /* Record that the user has logged out. */ |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 2054 | if (s->pid != 0) |
Tim Rice | e06ae4a | 2002-02-24 17:56:46 -0800 | [diff] [blame] | 2055 | record_logout(s->pid, s->tty, s->pw->pw_name); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2056 | |
| 2057 | /* Release the pseudo-tty. */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2058 | if (getuid() == 0) |
| 2059 | pty_release(s->tty); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2060 | |
| 2061 | /* |
| 2062 | * Close the server side of the socket pairs. We must do this after |
| 2063 | * the pty cleanup, so that another process doesn't get this pty |
| 2064 | * while we're still cleaning up. |
| 2065 | */ |
| 2066 | if (close(s->ptymaster) < 0) |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2067 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
Damien Miller | 0585d51 | 2001-10-12 11:35:50 +1000 | [diff] [blame] | 2068 | |
| 2069 | /* unlink pty from session */ |
| 2070 | s->ttyfd = -1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2071 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2072 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2073 | void |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2074 | session_pty_cleanup(Session *s) |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2075 | { |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2076 | PRIVSEP(session_pty_cleanup2(s)); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2077 | } |
| 2078 | |
Damien Miller | 5a80bba | 2002-09-04 16:39:02 +1000 | [diff] [blame] | 2079 | static char * |
| 2080 | sig2name(int sig) |
| 2081 | { |
| 2082 | #define SSH_SIG(x) if (sig == SIG ## x) return #x |
| 2083 | SSH_SIG(ABRT); |
| 2084 | SSH_SIG(ALRM); |
| 2085 | SSH_SIG(FPE); |
| 2086 | SSH_SIG(HUP); |
| 2087 | SSH_SIG(ILL); |
| 2088 | SSH_SIG(INT); |
| 2089 | SSH_SIG(KILL); |
| 2090 | SSH_SIG(PIPE); |
| 2091 | SSH_SIG(QUIT); |
| 2092 | SSH_SIG(SEGV); |
| 2093 | SSH_SIG(TERM); |
| 2094 | SSH_SIG(USR1); |
| 2095 | SSH_SIG(USR2); |
| 2096 | #undef SSH_SIG |
| 2097 | return "SIG@openssh.com"; |
| 2098 | } |
| 2099 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2100 | static void |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2101 | session_close_x11(int id) |
| 2102 | { |
| 2103 | Channel *c; |
| 2104 | |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 2105 | if ((c = channel_by_id(id)) == NULL) { |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2106 | debug("session_close_x11: x11 channel %d missing", id); |
| 2107 | } else { |
| 2108 | /* Detach X11 listener */ |
| 2109 | debug("session_close_x11: detach x11 channel %d", id); |
| 2110 | channel_cancel_cleanup(id); |
| 2111 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
| 2112 | chan_mark_dead(c); |
| 2113 | } |
| 2114 | } |
| 2115 | |
| 2116 | static void |
| 2117 | session_close_single_x11(int id, void *arg) |
| 2118 | { |
| 2119 | Session *s; |
| 2120 | u_int i; |
| 2121 | |
| 2122 | debug3("session_close_single_x11: channel %d", id); |
| 2123 | channel_cancel_cleanup(id); |
| 2124 | if ((s = session_by_x11_channel(id)) == NULL) |
| 2125 | fatal("session_close_single_x11: no x11 channel %d", id); |
| 2126 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
| 2127 | debug("session_close_single_x11: session %d: " |
| 2128 | "closing channel %d", s->self, s->x11_chanids[i]); |
| 2129 | /* |
| 2130 | * The channel "id" is already closing, but make sure we |
| 2131 | * close all of its siblings. |
| 2132 | */ |
| 2133 | if (s->x11_chanids[i] != id) |
| 2134 | session_close_x11(s->x11_chanids[i]); |
| 2135 | } |
| 2136 | xfree(s->x11_chanids); |
| 2137 | s->x11_chanids = NULL; |
| 2138 | if (s->display) { |
| 2139 | xfree(s->display); |
| 2140 | s->display = NULL; |
| 2141 | } |
| 2142 | if (s->auth_proto) { |
| 2143 | xfree(s->auth_proto); |
| 2144 | s->auth_proto = NULL; |
| 2145 | } |
| 2146 | if (s->auth_data) { |
| 2147 | xfree(s->auth_data); |
| 2148 | s->auth_data = NULL; |
| 2149 | } |
| 2150 | if (s->auth_display) { |
| 2151 | xfree(s->auth_display); |
| 2152 | s->auth_display = NULL; |
| 2153 | } |
| 2154 | } |
| 2155 | |
| 2156 | static void |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2157 | session_exit_message(Session *s, int status) |
| 2158 | { |
| 2159 | Channel *c; |
Damien Miller | f3dcf1f | 2002-02-08 22:06:48 +1100 | [diff] [blame] | 2160 | |
| 2161 | if ((c = channel_lookup(s->chanid)) == NULL) |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 2162 | fatal("session_exit_message: session %d: no channel %d", |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2163 | s->self, s->chanid); |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 2164 | debug("session_exit_message: session %d channel %d pid %ld", |
| 2165 | s->self, s->chanid, (long)s->pid); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2166 | |
| 2167 | if (WIFEXITED(status)) { |
Damien Miller | f3dcf1f | 2002-02-08 22:06:48 +1100 | [diff] [blame] | 2168 | channel_request_start(s->chanid, "exit-status", 0); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2169 | packet_put_int(WEXITSTATUS(status)); |
| 2170 | packet_send(); |
| 2171 | } else if (WIFSIGNALED(status)) { |
Damien Miller | f3dcf1f | 2002-02-08 22:06:48 +1100 | [diff] [blame] | 2172 | channel_request_start(s->chanid, "exit-signal", 0); |
Damien Miller | 5a80bba | 2002-09-04 16:39:02 +1000 | [diff] [blame] | 2173 | packet_put_cstring(sig2name(WTERMSIG(status))); |
Damien Miller | f3c6cf1 | 2000-05-17 22:08:29 +1000 | [diff] [blame] | 2174 | #ifdef WCOREDUMP |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2175 | packet_put_char(WCOREDUMP(status)); |
Damien Miller | f3c6cf1 | 2000-05-17 22:08:29 +1000 | [diff] [blame] | 2176 | #else /* WCOREDUMP */ |
| 2177 | packet_put_char(0); |
| 2178 | #endif /* WCOREDUMP */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2179 | packet_put_cstring(""); |
| 2180 | packet_put_cstring(""); |
| 2181 | packet_send(); |
| 2182 | } else { |
| 2183 | /* Some weird exit cause. Just exit. */ |
| 2184 | packet_disconnect("wait returned status %04x.", status); |
| 2185 | } |
| 2186 | |
| 2187 | /* disconnect channel */ |
| 2188 | debug("session_exit_message: release channel %d", s->chanid); |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 2189 | |
| 2190 | /* |
| 2191 | * Adjust cleanup callback attachment to send close messages when |
| 2192 | * the channel gets EOF. The session will be then be closed |
| 2193 | * by session_close_by_channel when the childs close their fds. |
| 2194 | */ |
| 2195 | channel_register_cleanup(c->self, session_close_by_channel, 1); |
| 2196 | |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 2197 | /* |
| 2198 | * emulate a write failure with 'chan_write_failed', nobody will be |
| 2199 | * interested in data we write. |
| 2200 | * Note that we must not call 'chan_read_failed', since there could |
| 2201 | * be some more data waiting in the pipe. |
| 2202 | */ |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2203 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
| 2204 | chan_write_failed(c); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2205 | } |
| 2206 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2207 | void |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 2208 | session_close(Session *s) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2209 | { |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 2210 | u_int i; |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 2211 | |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 2212 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2213 | if (s->ttyfd != -1) |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 2214 | session_pty_cleanup(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2215 | if (s->term) |
| 2216 | xfree(s->term); |
| 2217 | if (s->display) |
| 2218 | xfree(s->display); |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2219 | if (s->x11_chanids) |
| 2220 | xfree(s->x11_chanids); |
Damien Miller | 512bccb | 2002-02-05 12:11:02 +1100 | [diff] [blame] | 2221 | if (s->auth_display) |
| 2222 | xfree(s->auth_display); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2223 | if (s->auth_data) |
| 2224 | xfree(s->auth_data); |
| 2225 | if (s->auth_proto) |
| 2226 | xfree(s->auth_proto); |
| 2227 | s->used = 0; |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 2228 | for (i = 0; i < s->num_env; i++) { |
| 2229 | xfree(s->env[i].name); |
| 2230 | xfree(s->env[i].val); |
| 2231 | } |
| 2232 | if (s->env != NULL) |
| 2233 | xfree(s->env); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2234 | session_proctitle(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2235 | } |
| 2236 | |
| 2237 | void |
| 2238 | session_close_by_pid(pid_t pid, int status) |
| 2239 | { |
| 2240 | Session *s = session_by_pid(pid); |
| 2241 | if (s == NULL) { |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 2242 | debug("session_close_by_pid: no session for pid %ld", |
| 2243 | (long)pid); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2244 | return; |
| 2245 | } |
| 2246 | if (s->chanid != -1) |
| 2247 | session_exit_message(s, status); |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 2248 | if (s->ttyfd != -1) |
| 2249 | session_pty_cleanup(s); |
Tim Rice | 83d2f5f | 2006-02-07 15:17:44 -0800 | [diff] [blame] | 2250 | s->pid = 0; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2251 | } |
| 2252 | |
| 2253 | /* |
| 2254 | * this is called when a channel dies before |
| 2255 | * the session 'child' itself dies |
| 2256 | */ |
| 2257 | void |
| 2258 | session_close_by_channel(int id, void *arg) |
| 2259 | { |
| 2260 | Session *s = session_by_channel(id); |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 2261 | u_int i; |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2262 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2263 | if (s == NULL) { |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2264 | debug("session_close_by_channel: no session for id %d", id); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2265 | return; |
| 2266 | } |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 2267 | debug("session_close_by_channel: channel %d child %ld", |
| 2268 | id, (long)s->pid); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2269 | if (s->pid != 0) { |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2270 | debug("session_close_by_channel: channel %d: has child", id); |
Damien Miller | 0585d51 | 2001-10-12 11:35:50 +1000 | [diff] [blame] | 2271 | /* |
| 2272 | * delay detach of session, but release pty, since |
| 2273 | * the fd's to the child are already closed |
| 2274 | */ |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2275 | if (s->ttyfd != -1) |
Damien Miller | 0585d51 | 2001-10-12 11:35:50 +1000 | [diff] [blame] | 2276 | session_pty_cleanup(s); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2277 | return; |
| 2278 | } |
| 2279 | /* detach by removing callback */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2280 | channel_cancel_cleanup(s->chanid); |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 2281 | |
| 2282 | /* Close any X11 listeners associated with this session */ |
| 2283 | if (s->x11_chanids != NULL) { |
| 2284 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
| 2285 | session_close_x11(s->x11_chanids[i]); |
| 2286 | s->x11_chanids[i] = -1; |
| 2287 | } |
| 2288 | } |
| 2289 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2290 | s->chanid = -1; |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 2291 | session_close(s); |
| 2292 | } |
| 2293 | |
| 2294 | void |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2295 | session_destroy_all(void (*closefunc)(Session *)) |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 2296 | { |
| 2297 | int i; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 2298 | for (i = 0; i < MAX_SESSIONS; i++) { |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 2299 | Session *s = &sessions[i]; |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2300 | if (s->used) { |
| 2301 | if (closefunc != NULL) |
| 2302 | closefunc(s); |
| 2303 | else |
| 2304 | session_close(s); |
| 2305 | } |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 2306 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2307 | } |
| 2308 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2309 | static char * |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2310 | session_tty_list(void) |
| 2311 | { |
| 2312 | static char buf[1024]; |
| 2313 | int i; |
Damien Miller | a8ed44b | 2003-01-10 09:53:12 +1100 | [diff] [blame] | 2314 | char *cp; |
| 2315 | |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2316 | buf[0] = '\0'; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 2317 | for (i = 0; i < MAX_SESSIONS; i++) { |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2318 | Session *s = &sessions[i]; |
| 2319 | if (s->used && s->ttyfd != -1) { |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 2320 | |
Damien Miller | a8ed44b | 2003-01-10 09:53:12 +1100 | [diff] [blame] | 2321 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
| 2322 | cp = strrchr(s->tty, '/'); |
| 2323 | cp = (cp == NULL) ? s->tty : cp + 1; |
| 2324 | } else |
| 2325 | cp = s->tty + 5; |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 2326 | |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2327 | if (buf[0] != '\0') |
| 2328 | strlcat(buf, ",", sizeof buf); |
Damien Miller | a8ed44b | 2003-01-10 09:53:12 +1100 | [diff] [blame] | 2329 | strlcat(buf, cp, sizeof buf); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2330 | } |
| 2331 | } |
| 2332 | if (buf[0] == '\0') |
| 2333 | strlcpy(buf, "notty", sizeof buf); |
| 2334 | return buf; |
| 2335 | } |
| 2336 | |
| 2337 | void |
| 2338 | session_proctitle(Session *s) |
| 2339 | { |
| 2340 | if (s->pw == NULL) |
| 2341 | error("no user for session %d", s->self); |
| 2342 | else |
| 2343 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); |
| 2344 | } |
| 2345 | |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2346 | int |
| 2347 | session_setup_x11fwd(Session *s) |
| 2348 | { |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2349 | struct stat st; |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2350 | char display[512], auth_display[512]; |
| 2351 | char hostname[MAXHOSTNAMELEN]; |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2352 | u_int i; |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2353 | |
| 2354 | if (no_x11_forwarding_flag) { |
| 2355 | packet_send_debug("X11 forwarding disabled in user configuration file."); |
| 2356 | return 0; |
| 2357 | } |
| 2358 | if (!options.x11_forwarding) { |
| 2359 | debug("X11 forwarding disabled in server configuration file."); |
| 2360 | return 0; |
| 2361 | } |
| 2362 | if (!options.xauth_location || |
| 2363 | (stat(options.xauth_location, &st) == -1)) { |
| 2364 | packet_send_debug("No xauth program; cannot forward with spoofing."); |
| 2365 | return 0; |
| 2366 | } |
Ben Lindstrom | 699776e | 2001-06-21 03:14:49 +0000 | [diff] [blame] | 2367 | if (options.use_login) { |
| 2368 | packet_send_debug("X11 forwarding disabled; " |
| 2369 | "not compatible with UseLogin=yes."); |
| 2370 | return 0; |
| 2371 | } |
Ben Lindstrom | 2bcdf06 | 2001-06-13 04:41:41 +0000 | [diff] [blame] | 2372 | if (s->display != NULL) { |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2373 | debug("X11 display already set."); |
| 2374 | return 0; |
| 2375 | } |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2376 | if (x11_create_display_inet(options.x11_display_offset, |
| 2377 | options.x11_use_localhost, s->single_connection, |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2378 | &s->display_number, &s->x11_chanids) == -1) { |
Ben Lindstrom | 2bcdf06 | 2001-06-13 04:41:41 +0000 | [diff] [blame] | 2379 | debug("x11_create_display_inet failed."); |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2380 | return 0; |
| 2381 | } |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2382 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
| 2383 | channel_register_cleanup(s->x11_chanids[i], |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 2384 | session_close_single_x11, 0); |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2385 | } |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2386 | |
| 2387 | /* Set up a suitable value for the DISPLAY variable. */ |
| 2388 | if (gethostname(hostname, sizeof(hostname)) < 0) |
| 2389 | fatal("gethostname: %.100s", strerror(errno)); |
| 2390 | /* |
| 2391 | * auth_display must be used as the displayname when the |
| 2392 | * authorization entry is added with xauth(1). This will be |
| 2393 | * different than the DISPLAY string for localhost displays. |
| 2394 | */ |
Damien Miller | 95c249f | 2002-02-05 12:11:34 +1100 | [diff] [blame] | 2395 | if (options.x11_use_localhost) { |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2396 | snprintf(display, sizeof display, "localhost:%u.%u", |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2397 | s->display_number, s->screen); |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2398 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
Damien Miller | 512bccb | 2002-02-05 12:11:02 +1100 | [diff] [blame] | 2399 | s->display_number, s->screen); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2400 | s->display = xstrdup(display); |
Damien Miller | 512bccb | 2002-02-05 12:11:02 +1100 | [diff] [blame] | 2401 | s->auth_display = xstrdup(auth_display); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2402 | } else { |
| 2403 | #ifdef IPADDR_IN_DISPLAY |
| 2404 | struct hostent *he; |
| 2405 | struct in_addr my_addr; |
| 2406 | |
| 2407 | he = gethostbyname(hostname); |
| 2408 | if (he == NULL) { |
| 2409 | error("Can't get IP address for X11 DISPLAY."); |
| 2410 | packet_send_debug("Can't get IP address for X11 DISPLAY."); |
| 2411 | return 0; |
| 2412 | } |
| 2413 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2414 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2415 | s->display_number, s->screen); |
| 2416 | #else |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2417 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2418 | s->display_number, s->screen); |
| 2419 | #endif |
| 2420 | s->display = xstrdup(display); |
Damien Miller | 512bccb | 2002-02-05 12:11:02 +1100 | [diff] [blame] | 2421 | s->auth_display = xstrdup(display); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2422 | } |
| 2423 | |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2424 | return 1; |
| 2425 | } |
| 2426 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2427 | static void |
Ben Lindstrom | db65e8f | 2001-01-19 04:26:52 +0000 | [diff] [blame] | 2428 | do_authenticated2(Authctxt *authctxt) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2429 | { |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 2430 | server_loop2(authctxt); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2431 | } |
| 2432 | |
| 2433 | void |
| 2434 | do_cleanup(Authctxt *authctxt) |
| 2435 | { |
| 2436 | static int called = 0; |
| 2437 | |
| 2438 | debug("do_cleanup"); |
| 2439 | |
| 2440 | /* no cleanup if we're in the child for login shell */ |
| 2441 | if (is_child) |
| 2442 | return; |
| 2443 | |
| 2444 | /* avoid double cleanup */ |
| 2445 | if (called) |
| 2446 | return; |
| 2447 | called = 1; |
| 2448 | |
| 2449 | if (authctxt == NULL) |
| 2450 | return; |
| 2451 | #ifdef KRB5 |
| 2452 | if (options.kerberos_ticket_cleanup && |
| 2453 | authctxt->krb5_ctx) |
| 2454 | krb5_cleanup_proc(authctxt); |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 2455 | #endif |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2456 | |
| 2457 | #ifdef GSSAPI |
| 2458 | if (compat20 && options.gss_cleanup_creds) |
| 2459 | ssh_gssapi_cleanup_creds(); |
| 2460 | #endif |
| 2461 | |
Darren Tucker | 8846a07 | 2003-10-07 11:30:15 +1000 | [diff] [blame] | 2462 | #ifdef USE_PAM |
| 2463 | if (options.use_pam) { |
| 2464 | sshpam_cleanup(); |
| 2465 | sshpam_thread_cleanup(); |
| 2466 | } |
| 2467 | #endif |
| 2468 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2469 | /* remove agent socket */ |
| 2470 | auth_sock_cleanup_proc(authctxt->pw); |
| 2471 | |
| 2472 | /* |
| 2473 | * Cleanup ptys/utmp only if privsep is disabled, |
| 2474 | * or if running in monitor. |
| 2475 | */ |
| 2476 | if (!use_privsep || mm_is_monitor()) |
| 2477 | session_destroy_all(session_pty_cleanup2); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2478 | } |