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 | 03e2003 | 2006-03-15 11:16:59 +1100 | [diff] [blame] | 36 | RCSID("$OpenBSD: session.c,v 1.192 2006/02/08 12:15:27 stevesk Exp $"); |
| 37 | |
| 38 | #include <paths.h> |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 39 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 40 | #include "ssh.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 41 | #include "ssh1.h" |
| 42 | #include "ssh2.h" |
| 43 | #include "xmalloc.h" |
Ben Lindstrom | d95c09c | 2001-02-18 19:13:33 +0000 | [diff] [blame] | 44 | #include "sshpty.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 45 | #include "packet.h" |
| 46 | #include "buffer.h" |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 47 | #include "match.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 48 | #include "uidswap.h" |
| 49 | #include "compat.h" |
Ben Lindstrom | c763767 | 2001-06-09 00:36:26 +0000 | [diff] [blame] | 50 | #include "channels.h" |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 51 | #include "bufaux.h" |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 52 | #include "auth.h" |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 53 | #include "auth-options.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 54 | #include "pathnames.h" |
| 55 | #include "log.h" |
| 56 | #include "servconf.h" |
Ben Lindstrom | d95c09c | 2001-02-18 19:13:33 +0000 | [diff] [blame] | 57 | #include "sshlogin.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 58 | #include "serverloop.h" |
| 59 | #include "canohost.h" |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 60 | #include "session.h" |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 61 | #include "kex.h" |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 62 | #include "monitor_wrap.h" |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 63 | |
Darren Tucker | 3c78c5e | 2004-01-23 22:03:10 +1100 | [diff] [blame] | 64 | #if defined(KRB5) && defined(USE_AFS) |
Damien Miller | 8f341f8 | 2004-01-21 11:00:46 +1100 | [diff] [blame] | 65 | #include <kafs.h> |
| 66 | #endif |
| 67 | |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 68 | #ifdef GSSAPI |
| 69 | #include "ssh-gss.h" |
| 70 | #endif |
| 71 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 72 | /* func */ |
| 73 | |
| 74 | Session *session_new(void); |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 75 | void session_set_fds(Session *, int, int, int); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 76 | void session_pty_cleanup(Session *); |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 77 | void session_proctitle(Session *); |
| 78 | int session_setup_x11fwd(Session *); |
| 79 | void do_exec_pty(Session *, const char *); |
| 80 | void do_exec_no_pty(Session *, const char *); |
| 81 | void do_exec(Session *, const char *); |
| 82 | void do_login(Session *, const char *); |
Kevin Steves | a0957d6 | 2001-09-27 19:50:26 +0000 | [diff] [blame] | 83 | #ifdef LOGIN_NEEDS_UTMPX |
| 84 | static void do_pre_login(Session *s); |
| 85 | #endif |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 86 | void do_child(Session *, const char *); |
Damien Miller | cf205e8 | 2001-04-16 18:29:15 +1000 | [diff] [blame] | 87 | void do_motd(void); |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 88 | int check_quietlogin(Session *, const char *); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 89 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 90 | static void do_authenticated1(Authctxt *); |
| 91 | static void do_authenticated2(Authctxt *); |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 92 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 93 | static int session_pty_req(Session *); |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 94 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 95 | /* import */ |
| 96 | extern ServerOptions options; |
| 97 | extern char *__progname; |
| 98 | extern int log_stderr; |
| 99 | extern int debug_flag; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 100 | extern u_int utmp_len; |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 101 | extern int startup_pipe; |
Ben Lindstrom | 005dd22 | 2001-04-18 15:29:33 +0000 | [diff] [blame] | 102 | extern void destroy_sensitive_data(void); |
Darren Tucker | b9aa0a0 | 2003-07-08 22:59:59 +1000 | [diff] [blame] | 103 | extern Buffer loginmsg; |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 104 | |
Damien Miller | 7b28dc5 | 2000-09-05 13:34:53 +1100 | [diff] [blame] | 105 | /* original command from peer. */ |
Ben Lindstrom | 0a7ca6c | 2001-06-21 03:17:42 +0000 | [diff] [blame] | 106 | const char *original_command = NULL; |
Damien Miller | 7b28dc5 | 2000-09-05 13:34:53 +1100 | [diff] [blame] | 107 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 108 | /* data */ |
| 109 | #define MAX_SESSIONS 10 |
| 110 | Session sessions[MAX_SESSIONS]; |
Damien Miller | 15e7d4b | 2000-09-29 10:57:35 +1100 | [diff] [blame] | 111 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 112 | #ifdef HAVE_LOGIN_CAP |
Ben Lindstrom | b481e13 | 2002-03-22 01:35:47 +0000 | [diff] [blame] | 113 | login_cap_t *lc; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 114 | #endif |
| 115 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 116 | static int is_child = 0; |
| 117 | |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 118 | /* Name and directory of socket for authentication agent forwarding. */ |
| 119 | static char *auth_sock_name = NULL; |
| 120 | static char *auth_sock_dir = NULL; |
| 121 | |
| 122 | /* removes the agent forwarding socket */ |
| 123 | |
| 124 | static void |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 125 | auth_sock_cleanup_proc(struct passwd *pw) |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 126 | { |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 127 | if (auth_sock_name != NULL) { |
| 128 | temporarily_use_uid(pw); |
| 129 | unlink(auth_sock_name); |
| 130 | rmdir(auth_sock_dir); |
| 131 | auth_sock_name = NULL; |
| 132 | restore_uid(); |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | static int |
| 137 | auth_input_request_forwarding(struct passwd * pw) |
| 138 | { |
| 139 | Channel *nc; |
| 140 | int sock; |
| 141 | struct sockaddr_un sunaddr; |
| 142 | |
| 143 | if (auth_sock_name != NULL) { |
| 144 | error("authentication forwarding requested twice."); |
| 145 | return 0; |
| 146 | } |
| 147 | |
| 148 | /* Temporarily drop privileged uid for mkdir/bind. */ |
| 149 | temporarily_use_uid(pw); |
| 150 | |
| 151 | /* Allocate a buffer for the socket name, and format the name. */ |
| 152 | auth_sock_name = xmalloc(MAXPATHLEN); |
| 153 | auth_sock_dir = xmalloc(MAXPATHLEN); |
Darren Tucker | 072a7b1 | 2003-10-15 16:10:25 +1000 | [diff] [blame] | 154 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 155 | |
| 156 | /* Create private directory for socket */ |
| 157 | if (mkdtemp(auth_sock_dir) == NULL) { |
| 158 | packet_send_debug("Agent forwarding disabled: " |
| 159 | "mkdtemp() failed: %.100s", strerror(errno)); |
| 160 | restore_uid(); |
| 161 | xfree(auth_sock_name); |
| 162 | xfree(auth_sock_dir); |
| 163 | auth_sock_name = NULL; |
| 164 | auth_sock_dir = NULL; |
| 165 | return 0; |
| 166 | } |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 167 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", |
| 168 | auth_sock_dir, (long) getpid()); |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 169 | |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 170 | /* Create the socket. */ |
| 171 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
| 172 | if (sock < 0) |
| 173 | packet_disconnect("socket: %.100s", strerror(errno)); |
| 174 | |
| 175 | /* Bind it to the name. */ |
| 176 | memset(&sunaddr, 0, sizeof(sunaddr)); |
| 177 | sunaddr.sun_family = AF_UNIX; |
| 178 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); |
| 179 | |
| 180 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) |
| 181 | packet_disconnect("bind: %.100s", strerror(errno)); |
| 182 | |
| 183 | /* Restore the privileged uid. */ |
| 184 | restore_uid(); |
| 185 | |
| 186 | /* Start listening on the socket. */ |
Darren Tucker | 3175eb9 | 2003-12-09 19:15:11 +1100 | [diff] [blame] | 187 | if (listen(sock, SSH_LISTEN_BACKLOG) < 0) |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 188 | packet_disconnect("listen: %.100s", strerror(errno)); |
| 189 | |
| 190 | /* Allocate a channel for the authentication agent socket. */ |
| 191 | nc = channel_new("auth socket", |
| 192 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, |
| 193 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 194 | 0, "auth socket", 1); |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 195 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
| 196 | return 1; |
| 197 | } |
| 198 | |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 199 | static void |
| 200 | display_loginmsg(void) |
| 201 | { |
Damien Miller | 46d38de | 2005-07-17 17:02:09 +1000 | [diff] [blame] | 202 | if (buffer_len(&loginmsg) > 0) { |
| 203 | buffer_append(&loginmsg, "\0", 1); |
| 204 | printf("%s", (char *)buffer_ptr(&loginmsg)); |
| 205 | buffer_clear(&loginmsg); |
| 206 | } |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 207 | } |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 208 | |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 209 | void |
| 210 | do_authenticated(Authctxt *authctxt) |
| 211 | { |
Damien Miller | 97f39ae | 2003-02-24 11:57:01 +1100 | [diff] [blame] | 212 | setproctitle("%s", authctxt->pw->pw_name); |
| 213 | |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 214 | /* setup the channel layer */ |
| 215 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) |
| 216 | channel_permit_all_opens(); |
| 217 | |
| 218 | if (compat20) |
| 219 | do_authenticated2(authctxt); |
| 220 | else |
| 221 | do_authenticated1(authctxt); |
Ben Lindstrom | 838394c | 2001-06-09 01:11:59 +0000 | [diff] [blame] | 222 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 223 | do_cleanup(authctxt); |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 224 | } |
| 225 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 226 | /* |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 227 | * Prepares for an interactive session. This is called after the user has |
| 228 | * been successfully authenticated. During this message exchange, pseudo |
| 229 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings |
| 230 | * are requested, etc. |
| 231 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 232 | static void |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 233 | do_authenticated1(Authctxt *authctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 234 | { |
| 235 | Session *s; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 236 | char *command; |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 237 | int success, type, screen_flag; |
Ben Lindstrom | e23f4a3 | 2002-06-23 21:40:16 +0000 | [diff] [blame] | 238 | int enable_compression_after_reply = 0; |
| 239 | u_int proto_len, data_len, dlen, compression_level = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 240 | |
| 241 | s = session_new(); |
Darren Tucker | 172a5e8 | 2005-01-20 10:55:46 +1100 | [diff] [blame] | 242 | if (s == NULL) { |
| 243 | error("no more sessions"); |
| 244 | return; |
| 245 | } |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 246 | s->authctxt = authctxt; |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 247 | s->pw = authctxt->pw; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 248 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 249 | /* |
| 250 | * We stay in this loop until the client requests to execute a shell |
| 251 | * or a command. |
| 252 | */ |
| 253 | for (;;) { |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 254 | success = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 255 | |
| 256 | /* Get a packet from the client. */ |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 257 | type = packet_read(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 258 | |
| 259 | /* Process the packet. */ |
| 260 | switch (type) { |
| 261 | case SSH_CMSG_REQUEST_COMPRESSION: |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 262 | compression_level = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 263 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 264 | if (compression_level < 1 || compression_level > 9) { |
Darren Tucker | 5cb30ad | 2004-08-12 22:40:24 +1000 | [diff] [blame] | 265 | packet_send_debug("Received invalid compression level %d.", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 266 | compression_level); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 267 | break; |
| 268 | } |
Damien Miller | 9786e6e | 2005-07-26 21:54:56 +1000 | [diff] [blame] | 269 | if (options.compression == COMP_NONE) { |
Ben Lindstrom | 23e0f66 | 2002-06-21 01:09:47 +0000 | [diff] [blame] | 270 | debug2("compression disabled"); |
| 271 | break; |
| 272 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 273 | /* Enable compression after we have responded with SUCCESS. */ |
| 274 | enable_compression_after_reply = 1; |
| 275 | success = 1; |
| 276 | break; |
| 277 | |
| 278 | case SSH_CMSG_REQUEST_PTY: |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 279 | success = session_pty_req(s); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 280 | break; |
| 281 | |
| 282 | case SSH_CMSG_X11_REQUEST_FORWARDING: |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 283 | s->auth_proto = packet_get_string(&proto_len); |
| 284 | s->auth_data = packet_get_string(&data_len); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 285 | |
Ben Lindstrom | 7603b2d | 2001-02-26 20:13:32 +0000 | [diff] [blame] | 286 | screen_flag = packet_get_protocol_flags() & |
| 287 | SSH_PROTOFLAG_SCREEN_NUMBER; |
| 288 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); |
| 289 | |
| 290 | if (packet_remaining() == 4) { |
| 291 | if (!screen_flag) |
| 292 | debug2("Buggy client: " |
| 293 | "X11 screen flag missing"); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 294 | s->screen = packet_get_int(); |
Ben Lindstrom | 8dcdeb8 | 2001-02-16 16:02:14 +0000 | [diff] [blame] | 295 | } else { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 296 | s->screen = 0; |
Ben Lindstrom | 8dcdeb8 | 2001-02-16 16:02:14 +0000 | [diff] [blame] | 297 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 298 | packet_check_eom(); |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 299 | success = session_setup_x11fwd(s); |
| 300 | if (!success) { |
| 301 | xfree(s->auth_proto); |
| 302 | xfree(s->auth_data); |
Ben Lindstrom | 88259fb | 2001-06-12 00:21:34 +0000 | [diff] [blame] | 303 | s->auth_proto = NULL; |
| 304 | s->auth_data = NULL; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 305 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 306 | break; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 307 | |
| 308 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: |
| 309 | if (no_agent_forwarding_flag || compat13) { |
| 310 | debug("Authentication agent forwarding not permitted for this authentication."); |
| 311 | break; |
| 312 | } |
| 313 | debug("Received authentication agent forwarding request."); |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 314 | success = auth_input_request_forwarding(s->pw); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 315 | break; |
| 316 | |
| 317 | case SSH_CMSG_PORT_FORWARD_REQUEST: |
| 318 | if (no_port_forwarding_flag) { |
| 319 | debug("Port forwarding not permitted for this authentication."); |
| 320 | break; |
| 321 | } |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 322 | if (!options.allow_tcp_forwarding) { |
| 323 | debug("Port forwarding not permitted."); |
| 324 | break; |
| 325 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 326 | debug("Received TCP/IP port forwarding request."); |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 327 | 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] | 328 | success = 1; |
| 329 | break; |
| 330 | |
| 331 | case SSH_CMSG_MAX_PACKET_SIZE: |
| 332 | if (packet_set_maxsize(packet_get_int()) > 0) |
| 333 | success = 1; |
| 334 | break; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 335 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 336 | case SSH_CMSG_EXEC_SHELL: |
| 337 | case SSH_CMSG_EXEC_CMD: |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 338 | if (type == SSH_CMSG_EXEC_CMD) { |
| 339 | command = packet_get_string(&dlen); |
| 340 | debug("Exec command '%.500s'", command); |
Ben Lindstrom | 0a7ca6c | 2001-06-21 03:17:42 +0000 | [diff] [blame] | 341 | do_exec(s, command); |
| 342 | xfree(command); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 343 | } else { |
Ben Lindstrom | 0a7ca6c | 2001-06-21 03:17:42 +0000 | [diff] [blame] | 344 | do_exec(s, NULL); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 345 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 346 | packet_check_eom(); |
Ben Lindstrom | cb3929d | 2001-06-09 01:34:15 +0000 | [diff] [blame] | 347 | session_close(s); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 348 | return; |
| 349 | |
| 350 | default: |
| 351 | /* |
| 352 | * Any unknown messages in this phase are ignored, |
| 353 | * and a failure message is returned. |
| 354 | */ |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 355 | logit("Unknown packet type received after authentication: %d", type); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 356 | } |
| 357 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); |
| 358 | packet_send(); |
| 359 | packet_write_wait(); |
| 360 | |
| 361 | /* Enable compression now that we have replied if appropriate. */ |
| 362 | if (enable_compression_after_reply) { |
| 363 | enable_compression_after_reply = 0; |
| 364 | packet_start_compression(compression_level); |
| 365 | } |
| 366 | } |
| 367 | } |
| 368 | |
| 369 | /* |
| 370 | * This is called to fork and execute a command when we have no tty. This |
| 371 | * will call do_child from the child, and server_loop from the parent after |
| 372 | * setting up file descriptors and such. |
| 373 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 374 | void |
Ben Lindstrom | b4c961d | 2001-03-22 01:25:37 +0000 | [diff] [blame] | 375 | do_exec_no_pty(Session *s, const char *command) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 376 | { |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 377 | pid_t pid; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 378 | |
| 379 | #ifdef USE_PIPES |
| 380 | int pin[2], pout[2], perr[2]; |
| 381 | /* Allocate pipes for communicating with the program. */ |
| 382 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) |
| 383 | packet_disconnect("Could not create pipes: %.100s", |
| 384 | strerror(errno)); |
| 385 | #else /* USE_PIPES */ |
| 386 | int inout[2], err[2]; |
| 387 | /* Uses socket pairs to communicate with the program. */ |
| 388 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || |
| 389 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) |
| 390 | packet_disconnect("Could not create socket pairs: %.100s", |
| 391 | strerror(errno)); |
| 392 | #endif /* USE_PIPES */ |
| 393 | if (s == NULL) |
| 394 | fatal("do_exec_no_pty: no session"); |
| 395 | |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 396 | session_proctitle(s); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 397 | |
Damien Miller | c594633 | 2001-02-28 11:46:11 +1100 | [diff] [blame] | 398 | #if defined(USE_PAM) |
Darren Tucker | 1825f26 | 2004-02-24 00:01:27 +1100 | [diff] [blame] | 399 | if (options.use_pam && !use_privsep) |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 400 | do_pam_setcred(1); |
Kevin Steves | ff793a2 | 2001-02-21 16:36:51 +0000 | [diff] [blame] | 401 | #endif /* USE_PAM */ |
| 402 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 403 | /* Fork the child. */ |
| 404 | if ((pid = fork()) == 0) { |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 405 | is_child = 1; |
Ben Lindstrom | 264ee30 | 2002-07-23 21:01:56 +0000 | [diff] [blame] | 406 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 407 | /* Child. Reinitialize the log since the pid has changed. */ |
| 408 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
| 409 | |
| 410 | /* |
| 411 | * Create a new session and process group since the 4.4BSD |
| 412 | * setlogin() affects the entire process group. |
| 413 | */ |
| 414 | if (setsid() < 0) |
| 415 | error("setsid failed: %.100s", strerror(errno)); |
| 416 | |
| 417 | #ifdef USE_PIPES |
| 418 | /* |
| 419 | * Redirect stdin. We close the parent side of the socket |
| 420 | * pair, and make the child side the standard input. |
| 421 | */ |
| 422 | close(pin[1]); |
| 423 | if (dup2(pin[0], 0) < 0) |
| 424 | perror("dup2 stdin"); |
| 425 | close(pin[0]); |
| 426 | |
| 427 | /* Redirect stdout. */ |
| 428 | close(pout[0]); |
| 429 | if (dup2(pout[1], 1) < 0) |
| 430 | perror("dup2 stdout"); |
| 431 | close(pout[1]); |
| 432 | |
| 433 | /* Redirect stderr. */ |
| 434 | close(perr[0]); |
| 435 | if (dup2(perr[1], 2) < 0) |
| 436 | perror("dup2 stderr"); |
| 437 | close(perr[1]); |
| 438 | #else /* USE_PIPES */ |
| 439 | /* |
| 440 | * Redirect stdin, stdout, and stderr. Stdin and stdout will |
| 441 | * use the same socket, as some programs (particularly rdist) |
| 442 | * seem to depend on it. |
| 443 | */ |
| 444 | close(inout[1]); |
| 445 | close(err[1]); |
| 446 | if (dup2(inout[0], 0) < 0) /* stdin */ |
| 447 | perror("dup2 stdin"); |
| 448 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ |
| 449 | perror("dup2 stdout"); |
| 450 | if (dup2(err[0], 2) < 0) /* stderr */ |
| 451 | perror("dup2 stderr"); |
| 452 | #endif /* USE_PIPES */ |
| 453 | |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 454 | #ifdef _UNICOS |
| 455 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ |
| 456 | #endif |
| 457 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 458 | /* Do processing for the child (exec command etc). */ |
Ben Lindstrom | 86fe868 | 2001-03-17 00:32:57 +0000 | [diff] [blame] | 459 | do_child(s, command); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 460 | /* NOTREACHED */ |
| 461 | } |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 462 | #ifdef _UNICOS |
| 463 | signal(WJSIGNAL, cray_job_termination_handler); |
| 464 | #endif /* _UNICOS */ |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 465 | #ifdef HAVE_CYGWIN |
| 466 | if (is_winnt) |
| 467 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); |
| 468 | #endif |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 469 | if (pid < 0) |
| 470 | packet_disconnect("fork failed: %.100s", strerror(errno)); |
| 471 | s->pid = pid; |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 472 | /* Set interactive/non-interactive mode. */ |
| 473 | packet_set_interactive(s->display != NULL); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 474 | #ifdef USE_PIPES |
| 475 | /* We are the parent. Close the child sides of the pipes. */ |
| 476 | close(pin[0]); |
| 477 | close(pout[1]); |
| 478 | close(perr[1]); |
| 479 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 480 | if (compat20) { |
Darren Tucker | 723e945 | 2004-06-22 12:57:08 +1000 | [diff] [blame] | 481 | if (s->is_subsystem) { |
| 482 | close(perr[0]); |
| 483 | perr[0] = -1; |
| 484 | } |
| 485 | session_set_fds(s, pin[1], pout[0], perr[0]); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 486 | } else { |
| 487 | /* Enter the interactive session. */ |
| 488 | server_loop(pid, pin[1], pout[0], perr[0]); |
Ben Lindstrom | fc9b07d | 2001-03-22 01:27:23 +0000 | [diff] [blame] | 489 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 490 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 491 | #else /* USE_PIPES */ |
| 492 | /* We are the parent. Close the child sides of the socket pairs. */ |
| 493 | close(inout[0]); |
| 494 | close(err[0]); |
| 495 | |
| 496 | /* |
Darren Tucker | b385059 | 2004-03-27 16:44:21 +1100 | [diff] [blame] | 497 | * Clear loginmsg, since it's the child's responsibility to display |
| 498 | * it to the user, otherwise multiple sessions may accumulate |
| 499 | * multiple copies of the login messages. |
| 500 | */ |
| 501 | buffer_clear(&loginmsg); |
| 502 | |
| 503 | /* |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 504 | * Enter the interactive session. Note: server_loop must be able to |
| 505 | * handle the case that fdin and fdout are the same. |
| 506 | */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 507 | if (compat20) { |
Ben Lindstrom | fc9b07d | 2001-03-22 01:27:23 +0000 | [diff] [blame] | 508 | 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] | 509 | } else { |
| 510 | server_loop(pid, inout[1], inout[1], err[1]); |
| 511 | /* server_loop has closed inout[1] and err[1]. */ |
| 512 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 513 | #endif /* USE_PIPES */ |
| 514 | } |
| 515 | |
| 516 | /* |
| 517 | * This is called to fork and execute a command when we have a tty. This |
| 518 | * will call do_child from the child, and server_loop from the parent after |
| 519 | * setting up file descriptors, controlling tty, updating wtmp, utmp, |
| 520 | * lastlog, and other such operations. |
| 521 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 522 | void |
Ben Lindstrom | b4c961d | 2001-03-22 01:25:37 +0000 | [diff] [blame] | 523 | do_exec_pty(Session *s, const char *command) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 524 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 525 | int fdout, ptyfd, ttyfd, ptymaster; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 526 | pid_t pid; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 527 | |
| 528 | if (s == NULL) |
| 529 | fatal("do_exec_pty: no session"); |
| 530 | ptyfd = s->ptyfd; |
| 531 | ttyfd = s->ttyfd; |
| 532 | |
Damien Miller | c594633 | 2001-02-28 11:46:11 +1100 | [diff] [blame] | 533 | #if defined(USE_PAM) |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 534 | if (options.use_pam) { |
Damien Miller | 341c6e6 | 2003-09-02 23:18:52 +1000 | [diff] [blame] | 535 | do_pam_set_tty(s->tty); |
Darren Tucker | ef3a4a2 | 2004-02-06 15:30:50 +1100 | [diff] [blame] | 536 | if (!use_privsep) |
| 537 | do_pam_setcred(1); |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 538 | } |
Damien Miller | 5a76131 | 2001-02-27 09:28:23 +1100 | [diff] [blame] | 539 | #endif |
Kevin Steves | ff793a2 | 2001-02-21 16:36:51 +0000 | [diff] [blame] | 540 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 541 | /* Fork the child. */ |
| 542 | if ((pid = fork()) == 0) { |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 543 | is_child = 1; |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 544 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 545 | /* Child. Reinitialize the log because the pid has changed. */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 546 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 547 | /* Close the master side of the pseudo tty. */ |
| 548 | close(ptyfd); |
| 549 | |
| 550 | /* Make the pseudo tty our controlling tty. */ |
| 551 | pty_make_controlling_tty(&ttyfd, s->tty); |
| 552 | |
Damien Miller | 9c75142 | 2001-10-10 15:02:46 +1000 | [diff] [blame] | 553 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ |
| 554 | if (dup2(ttyfd, 0) < 0) |
| 555 | error("dup2 stdin: %s", strerror(errno)); |
| 556 | if (dup2(ttyfd, 1) < 0) |
| 557 | error("dup2 stdout: %s", strerror(errno)); |
| 558 | if (dup2(ttyfd, 2) < 0) |
| 559 | error("dup2 stderr: %s", strerror(errno)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 560 | |
| 561 | /* Close the extra descriptor for the pseudo tty. */ |
| 562 | close(ttyfd); |
| 563 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 564 | /* record login, etc. similar to login(1) */ |
Damien Miller | 364a9bd | 2001-04-16 18:37:05 +1000 | [diff] [blame] | 565 | #ifndef HAVE_OSF_SIA |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 566 | if (!(options.use_login && command == NULL)) { |
| 567 | #ifdef _UNICOS |
| 568 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ |
| 569 | #endif /* _UNICOS */ |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 570 | do_login(s, command); |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 571 | } |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 572 | # ifdef LOGIN_NEEDS_UTMPX |
| 573 | else |
| 574 | do_pre_login(s); |
| 575 | # endif |
Damien Miller | 364a9bd | 2001-04-16 18:37:05 +1000 | [diff] [blame] | 576 | #endif |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 577 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 578 | /* Do common processing for the child, such as execing the command. */ |
Ben Lindstrom | 86fe868 | 2001-03-17 00:32:57 +0000 | [diff] [blame] | 579 | do_child(s, command); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 580 | /* NOTREACHED */ |
| 581 | } |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 582 | #ifdef _UNICOS |
| 583 | signal(WJSIGNAL, cray_job_termination_handler); |
| 584 | #endif /* _UNICOS */ |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 585 | #ifdef HAVE_CYGWIN |
| 586 | if (is_winnt) |
| 587 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); |
| 588 | #endif |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 589 | if (pid < 0) |
| 590 | packet_disconnect("fork failed: %.100s", strerror(errno)); |
| 591 | s->pid = pid; |
| 592 | |
| 593 | /* Parent. Close the slave side of the pseudo tty. */ |
| 594 | close(ttyfd); |
| 595 | |
| 596 | /* |
| 597 | * Create another descriptor of the pty master side for use as the |
| 598 | * standard input. We could use the original descriptor, but this |
| 599 | * simplifies code in server_loop. The descriptor is bidirectional. |
| 600 | */ |
| 601 | fdout = dup(ptyfd); |
| 602 | if (fdout < 0) |
| 603 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); |
| 604 | |
| 605 | /* we keep a reference to the pty master */ |
| 606 | ptymaster = dup(ptyfd); |
| 607 | if (ptymaster < 0) |
| 608 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); |
| 609 | s->ptymaster = ptymaster; |
| 610 | |
| 611 | /* Enter interactive session. */ |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 612 | packet_set_interactive(1); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 613 | if (compat20) { |
| 614 | session_set_fds(s, ptyfd, fdout, -1); |
| 615 | } else { |
| 616 | server_loop(pid, ptyfd, fdout, -1); |
| 617 | /* server_loop _has_ closed ptyfd and fdout. */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 618 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 619 | } |
| 620 | |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 621 | #ifdef LOGIN_NEEDS_UTMPX |
Damien Miller | 599d8eb | 2001-09-15 12:25:53 +1000 | [diff] [blame] | 622 | static void |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 623 | do_pre_login(Session *s) |
| 624 | { |
| 625 | socklen_t fromlen; |
| 626 | struct sockaddr_storage from; |
| 627 | pid_t pid = getpid(); |
| 628 | |
| 629 | /* |
| 630 | * Get IP address of client. If the connection is not a socket, let |
| 631 | * the address be 0.0.0.0. |
| 632 | */ |
| 633 | memset(&from, 0, sizeof(from)); |
Damien Miller | ebc2306 | 2002-09-04 16:45:09 +1000 | [diff] [blame] | 634 | fromlen = sizeof(from); |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 635 | if (packet_connection_is_on_socket()) { |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 636 | if (getpeername(packet_get_connection_in(), |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 637 | (struct sockaddr *) & from, &fromlen) < 0) { |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 638 | debug("getpeername: %.100s", strerror(errno)); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 639 | cleanup_exit(255); |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 640 | } |
| 641 | } |
| 642 | |
| 643 | record_utmp_only(pid, s->tty, s->pw->pw_name, |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 644 | get_remote_name_or_ip(utmp_len, options.use_dns), |
Kevin Steves | 678ee51 | 2003-01-01 23:43:55 +0000 | [diff] [blame] | 645 | (struct sockaddr *)&from, fromlen); |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 646 | } |
| 647 | #endif |
| 648 | |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 649 | /* |
| 650 | * This is called to fork and execute a command. If another command is |
| 651 | * to be forced, execute that instead. |
| 652 | */ |
| 653 | void |
| 654 | do_exec(Session *s, const char *command) |
| 655 | { |
| 656 | if (forced_command) { |
| 657 | original_command = command; |
| 658 | command = forced_command; |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 659 | debug("Forced command '%.900s'", command); |
| 660 | } |
| 661 | |
Darren Tucker | 2e0cf0d | 2005-02-08 21:52:47 +1100 | [diff] [blame] | 662 | #ifdef SSH_AUDIT_EVENTS |
Darren Tucker | 269a1ea | 2005-02-03 00:20:53 +1100 | [diff] [blame] | 663 | if (command != NULL) |
| 664 | PRIVSEP(audit_run_command(command)); |
| 665 | else if (s->ttyfd == -1) { |
| 666 | char *shell = s->pw->pw_shell; |
| 667 | |
| 668 | if (shell[0] == '\0') /* empty shell means /bin/sh */ |
| 669 | shell =_PATH_BSHELL; |
| 670 | PRIVSEP(audit_run_command(shell)); |
| 671 | } |
| 672 | #endif |
| 673 | |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 674 | if (s->ttyfd != -1) |
| 675 | do_exec_pty(s, command); |
| 676 | else |
| 677 | do_exec_no_pty(s, command); |
| 678 | |
Ben Lindstrom | 0a7ca6c | 2001-06-21 03:17:42 +0000 | [diff] [blame] | 679 | original_command = NULL; |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 680 | |
Darren Tucker | 0999174 | 2004-07-17 17:05:14 +1000 | [diff] [blame] | 681 | /* |
| 682 | * Clear loginmsg: it's the child's responsibility to display |
| 683 | * it to the user, otherwise multiple sessions may accumulate |
| 684 | * multiple copies of the login messages. |
| 685 | */ |
| 686 | buffer_clear(&loginmsg); |
| 687 | } |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 688 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 689 | /* administrative, login(1)-like work */ |
| 690 | void |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 691 | do_login(Session *s, const char *command) |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 692 | { |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 693 | socklen_t fromlen; |
| 694 | struct sockaddr_storage from; |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 695 | struct passwd * pw = s->pw; |
| 696 | pid_t pid = getpid(); |
| 697 | |
| 698 | /* |
| 699 | * Get IP address of client. If the connection is not a socket, let |
| 700 | * the address be 0.0.0.0. |
| 701 | */ |
| 702 | memset(&from, 0, sizeof(from)); |
Kevin Steves | 678ee51 | 2003-01-01 23:43:55 +0000 | [diff] [blame] | 703 | fromlen = sizeof(from); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 704 | if (packet_connection_is_on_socket()) { |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 705 | if (getpeername(packet_get_connection_in(), |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 706 | (struct sockaddr *) & from, &fromlen) < 0) { |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 707 | debug("getpeername: %.100s", strerror(errno)); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 708 | cleanup_exit(255); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 709 | } |
| 710 | } |
| 711 | |
| 712 | /* 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] | 713 | if (!use_privsep) |
| 714 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, |
| 715 | get_remote_name_or_ip(utmp_len, |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 716 | options.use_dns), |
Damien Miller | ebc2306 | 2002-09-04 16:45:09 +1000 | [diff] [blame] | 717 | (struct sockaddr *)&from, fromlen); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 718 | |
Kevin Steves | 092f2ef | 2000-10-14 13:36:13 +0000 | [diff] [blame] | 719 | #ifdef USE_PAM |
| 720 | /* |
| 721 | * If password change is needed, do it now. |
| 722 | * This needs to occur before the ~/.hushlogin check. |
| 723 | */ |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 724 | if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) { |
| 725 | display_loginmsg(); |
Kevin Steves | 092f2ef | 2000-10-14 13:36:13 +0000 | [diff] [blame] | 726 | do_pam_chauthtok(); |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 727 | s->authctxt->force_pwchange = 0; |
Damien Miller | 1f499fd | 2003-08-25 13:08:49 +1000 | [diff] [blame] | 728 | /* XXX - signal [net] parent to enable forwardings */ |
Kevin Steves | 092f2ef | 2000-10-14 13:36:13 +0000 | [diff] [blame] | 729 | } |
| 730 | #endif |
| 731 | |
Damien Miller | cf205e8 | 2001-04-16 18:29:15 +1000 | [diff] [blame] | 732 | if (check_quietlogin(s, command)) |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 733 | return; |
| 734 | |
Darren Tucker | 1921ed9 | 2004-02-10 13:23:28 +1100 | [diff] [blame] | 735 | display_loginmsg(); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 736 | |
Damien Miller | cf205e8 | 2001-04-16 18:29:15 +1000 | [diff] [blame] | 737 | do_motd(); |
| 738 | } |
| 739 | |
| 740 | /* |
| 741 | * Display the message of the day. |
| 742 | */ |
| 743 | void |
| 744 | do_motd(void) |
| 745 | { |
| 746 | FILE *f; |
| 747 | char buf[256]; |
| 748 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 749 | if (options.print_motd) { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 750 | #ifdef HAVE_LOGIN_CAP |
| 751 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", |
| 752 | "/etc/motd"), "r"); |
| 753 | #else |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 754 | f = fopen("/etc/motd", "r"); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 755 | #endif |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 756 | if (f) { |
| 757 | while (fgets(buf, sizeof(buf), f)) |
| 758 | fputs(buf, stdout); |
| 759 | fclose(f); |
| 760 | } |
| 761 | } |
| 762 | } |
| 763 | |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 764 | |
| 765 | /* |
| 766 | * Check for quiet login, either .hushlogin or command given. |
| 767 | */ |
| 768 | int |
| 769 | check_quietlogin(Session *s, const char *command) |
| 770 | { |
| 771 | char buf[256]; |
| 772 | struct passwd *pw = s->pw; |
| 773 | struct stat st; |
| 774 | |
| 775 | /* Return 1 if .hushlogin exists or a command given. */ |
| 776 | if (command != NULL) |
| 777 | return 1; |
| 778 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); |
| 779 | #ifdef HAVE_LOGIN_CAP |
| 780 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) |
| 781 | return 1; |
| 782 | #else |
| 783 | if (stat(buf, &st) >= 0) |
| 784 | return 1; |
| 785 | #endif |
| 786 | return 0; |
| 787 | } |
| 788 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 789 | /* |
| 790 | * Sets the value of the given variable in the environment. If the variable |
| 791 | * already exists, its value is overriden. |
| 792 | */ |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 793 | void |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 794 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 795 | const char *value) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 796 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 797 | char **env; |
Darren Tucker | fb16b24 | 2003-09-22 21:04:23 +1000 | [diff] [blame] | 798 | u_int envsize; |
| 799 | u_int i, namelen; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 800 | |
| 801 | /* |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 802 | * If we're passed an uninitialized list, allocate a single null |
| 803 | * entry before continuing. |
| 804 | */ |
| 805 | if (*envp == NULL && *envsizep == 0) { |
| 806 | *envp = xmalloc(sizeof(char *)); |
| 807 | *envp[0] = NULL; |
| 808 | *envsizep = 1; |
| 809 | } |
| 810 | |
| 811 | /* |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 812 | * Find the slot where the value should be stored. If the variable |
| 813 | * already exists, we reuse the slot; otherwise we append a new slot |
| 814 | * at the end of the array, expanding if necessary. |
| 815 | */ |
| 816 | env = *envp; |
| 817 | namelen = strlen(name); |
| 818 | for (i = 0; env[i]; i++) |
| 819 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') |
| 820 | break; |
| 821 | if (env[i]) { |
| 822 | /* Reuse the slot. */ |
| 823 | xfree(env[i]); |
| 824 | } else { |
| 825 | /* New variable. Expand if necessary. */ |
Darren Tucker | fb16b24 | 2003-09-22 21:04:23 +1000 | [diff] [blame] | 826 | envsize = *envsizep; |
| 827 | if (i >= envsize - 1) { |
| 828 | if (envsize >= 1000) |
| 829 | fatal("child_set_env: too many env vars"); |
| 830 | envsize += 50; |
| 831 | env = (*envp) = xrealloc(env, envsize * sizeof(char *)); |
| 832 | *envsizep = envsize; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 833 | } |
| 834 | /* Need to set the NULL pointer at end of array beyond the new slot. */ |
| 835 | env[i + 1] = NULL; |
| 836 | } |
| 837 | |
| 838 | /* Allocate space and format the variable in the appropriate slot. */ |
| 839 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); |
| 840 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); |
| 841 | } |
| 842 | |
| 843 | /* |
| 844 | * Reads environment variables from the given file and adds/overrides them |
| 845 | * into the environment. If the file does not exist, this does nothing. |
| 846 | * Otherwise, it must consist of empty lines, comments (line starts with '#') |
| 847 | * and assignments of the form name=value. No other forms are allowed. |
| 848 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 849 | static void |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 850 | read_environment_file(char ***env, u_int *envsize, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 851 | const char *filename) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 852 | { |
| 853 | FILE *f; |
| 854 | char buf[4096]; |
| 855 | char *cp, *value; |
Damien Miller | 990070a | 2002-06-26 23:51:06 +1000 | [diff] [blame] | 856 | u_int lineno = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 857 | |
| 858 | f = fopen(filename, "r"); |
| 859 | if (!f) |
| 860 | return; |
| 861 | |
| 862 | while (fgets(buf, sizeof(buf), f)) { |
Damien Miller | 990070a | 2002-06-26 23:51:06 +1000 | [diff] [blame] | 863 | if (++lineno > 1000) |
| 864 | fatal("Too many lines in environment file %s", filename); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 865 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
| 866 | ; |
| 867 | if (!*cp || *cp == '#' || *cp == '\n') |
| 868 | continue; |
| 869 | if (strchr(cp, '\n')) |
| 870 | *strchr(cp, '\n') = '\0'; |
| 871 | value = strchr(cp, '='); |
| 872 | if (value == NULL) { |
Damien Miller | 990070a | 2002-06-26 23:51:06 +1000 | [diff] [blame] | 873 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
| 874 | filename); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 875 | continue; |
| 876 | } |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 877 | /* |
| 878 | * Replace the equals sign by nul, and advance value to |
| 879 | * the value string. |
| 880 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 881 | *value = '\0'; |
| 882 | value++; |
| 883 | child_set_env(env, envsize, cp, value); |
| 884 | } |
| 885 | fclose(f); |
| 886 | } |
| 887 | |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 888 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
| 889 | /* |
| 890 | * Return named variable from specified environment, or NULL if not present. |
| 891 | */ |
| 892 | static char * |
| 893 | child_get_env(char **env, const char *name) |
| 894 | { |
| 895 | int i; |
| 896 | size_t len; |
| 897 | |
| 898 | len = strlen(name); |
| 899 | for (i=0; env[i] != NULL; i++) |
| 900 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') |
| 901 | return(env[i] + len + 1); |
| 902 | return NULL; |
| 903 | } |
| 904 | |
| 905 | /* |
| 906 | * Read /etc/default/login. |
| 907 | * We pick up the PATH (or SUPATH for root) and UMASK. |
| 908 | */ |
| 909 | static void |
| 910 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) |
| 911 | { |
| 912 | char **tmpenv = NULL, *var; |
Darren Tucker | c11b1e8 | 2003-09-19 20:56:51 +1000 | [diff] [blame] | 913 | u_int i, tmpenvsize = 0; |
Darren Tucker | f391ba6 | 2003-10-02 20:07:09 +1000 | [diff] [blame] | 914 | u_long mask; |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 915 | |
| 916 | /* |
| 917 | * We don't want to copy the whole file to the child's environment, |
| 918 | * so we use a temporary environment and copy the variables we're |
| 919 | * interested in. |
| 920 | */ |
| 921 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); |
| 922 | |
Darren Tucker | c11b1e8 | 2003-09-19 20:56:51 +1000 | [diff] [blame] | 923 | if (tmpenv == NULL) |
| 924 | return; |
| 925 | |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 926 | if (uid == 0) |
| 927 | var = child_get_env(tmpenv, "SUPATH"); |
| 928 | else |
| 929 | var = child_get_env(tmpenv, "PATH"); |
| 930 | if (var != NULL) |
| 931 | child_set_env(env, envsize, "PATH", var); |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 932 | |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 933 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
| 934 | if (sscanf(var, "%5lo", &mask) == 1) |
Darren Tucker | f391ba6 | 2003-10-02 20:07:09 +1000 | [diff] [blame] | 935 | umask((mode_t)mask); |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 936 | |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 937 | for (i = 0; tmpenv[i] != NULL; i++) |
| 938 | xfree(tmpenv[i]); |
| 939 | xfree(tmpenv); |
| 940 | } |
| 941 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ |
| 942 | |
Damien Miller | 7dff869 | 2005-05-26 11:34:51 +1000 | [diff] [blame] | 943 | void |
| 944 | copy_environment(char **source, char ***env, u_int *envsize) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 945 | { |
Damien Miller | bb9ffc1 | 2002-01-08 10:59:32 +1100 | [diff] [blame] | 946 | char *var_name, *var_val; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 947 | int i; |
| 948 | |
Damien Miller | bb9ffc1 | 2002-01-08 10:59:32 +1100 | [diff] [blame] | 949 | if (source == NULL) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 950 | return; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 951 | |
Damien Miller | bb9ffc1 | 2002-01-08 10:59:32 +1100 | [diff] [blame] | 952 | for(i = 0; source[i] != NULL; i++) { |
| 953 | var_name = xstrdup(source[i]); |
| 954 | if ((var_val = strstr(var_name, "=")) == NULL) { |
| 955 | xfree(var_name); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 956 | continue; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 957 | } |
Damien Miller | bb9ffc1 | 2002-01-08 10:59:32 +1100 | [diff] [blame] | 958 | *var_val++ = '\0'; |
| 959 | |
| 960 | debug3("Copy environment: %s=%s", var_name, var_val); |
| 961 | child_set_env(env, envsize, var_name, var_val); |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 962 | |
Damien Miller | bb9ffc1 | 2002-01-08 10:59:32 +1100 | [diff] [blame] | 963 | xfree(var_name); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 964 | } |
| 965 | } |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 966 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 967 | static char ** |
| 968 | do_setup_env(Session *s, const char *shell) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 969 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 970 | char buf[256]; |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 971 | u_int i, envsize; |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 972 | char **env, *laddr, *path = NULL; |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 973 | struct passwd *pw = s->pw; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 974 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 975 | /* Initialize the environment. */ |
| 976 | envsize = 100; |
| 977 | env = xmalloc(envsize * sizeof(char *)); |
| 978 | env[0] = NULL; |
| 979 | |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 980 | #ifdef HAVE_CYGWIN |
| 981 | /* |
| 982 | * The Windows environment contains some setting which are |
| 983 | * important for a running system. They must not be dropped. |
| 984 | */ |
Darren Tucker | 14c372d | 2004-08-30 20:42:08 +1000 | [diff] [blame] | 985 | { |
| 986 | char **p; |
| 987 | |
| 988 | p = fetch_windows_environment(); |
| 989 | copy_environment(p, &env, &envsize); |
| 990 | free_windows_environment(p); |
| 991 | } |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 992 | #endif |
| 993 | |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 994 | #ifdef GSSAPI |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 995 | /* Allow any GSSAPI methods that we've used to alter |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 996 | * the childs environment as they see fit |
| 997 | */ |
| 998 | ssh_gssapi_do_child(&env, &envsize); |
| 999 | #endif |
| 1000 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1001 | if (!options.use_login) { |
| 1002 | /* Set basic environment. */ |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 1003 | for (i = 0; i < s->num_env; i++) |
Darren Tucker | fc95970 | 2004-07-17 16:12:08 +1000 | [diff] [blame] | 1004 | child_set_env(&env, &envsize, s->env[i].name, |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 1005 | s->env[i].val); |
| 1006 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1007 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
| 1008 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); |
Damien Miller | dfedbf8 | 2003-01-03 14:52:53 +1100 | [diff] [blame] | 1009 | #ifdef _AIX |
| 1010 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); |
| 1011 | #endif |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1012 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1013 | #ifdef HAVE_LOGIN_CAP |
Ben Lindstrom | b9051ec | 2002-07-23 21:11:09 +0000 | [diff] [blame] | 1014 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
| 1015 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); |
| 1016 | else |
| 1017 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 1018 | #else /* HAVE_LOGIN_CAP */ |
| 1019 | # ifndef HAVE_CYGWIN |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 1020 | /* |
| 1021 | * There's no standard path on Windows. The path contains |
| 1022 | * important components pointing to the system directories, |
| 1023 | * needed for loading shared libraries. So the path better |
| 1024 | * remains intact here. |
| 1025 | */ |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 1026 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
| 1027 | read_etc_default_login(&env, &envsize, pw->pw_uid); |
| 1028 | path = child_get_env(env, "PATH"); |
| 1029 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ |
| 1030 | if (path == NULL || *path == '\0') { |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 1031 | child_set_env(&env, &envsize, "PATH", |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 1032 | s->pw->pw_uid == 0 ? |
| 1033 | SUPERUSER_PATH : _PATH_STDPATH); |
| 1034 | } |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 1035 | # endif /* HAVE_CYGWIN */ |
| 1036 | #endif /* HAVE_LOGIN_CAP */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1037 | |
| 1038 | snprintf(buf, sizeof buf, "%.200s/%.50s", |
| 1039 | _PATH_MAILDIR, pw->pw_name); |
| 1040 | child_set_env(&env, &envsize, "MAIL", buf); |
| 1041 | |
| 1042 | /* Normal systems set SHELL by default. */ |
| 1043 | child_set_env(&env, &envsize, "SHELL", shell); |
| 1044 | } |
| 1045 | if (getenv("TZ")) |
| 1046 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); |
| 1047 | |
| 1048 | /* Set custom environment options from RSA authentication. */ |
Ben Lindstrom | 38b951c | 2001-12-06 17:47:47 +0000 | [diff] [blame] | 1049 | if (!options.use_login) { |
| 1050 | while (custom_environment) { |
| 1051 | struct envstring *ce = custom_environment; |
Ben Lindstrom | 5a9d0ea | 2002-07-04 00:12:53 +0000 | [diff] [blame] | 1052 | char *str = ce->s; |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1053 | |
Ben Lindstrom | 5a9d0ea | 2002-07-04 00:12:53 +0000 | [diff] [blame] | 1054 | for (i = 0; str[i] != '=' && str[i]; i++) |
Ben Lindstrom | 38b951c | 2001-12-06 17:47:47 +0000 | [diff] [blame] | 1055 | ; |
Ben Lindstrom | 5a9d0ea | 2002-07-04 00:12:53 +0000 | [diff] [blame] | 1056 | if (str[i] == '=') { |
| 1057 | str[i] = 0; |
| 1058 | child_set_env(&env, &envsize, str, str + i + 1); |
Ben Lindstrom | 38b951c | 2001-12-06 17:47:47 +0000 | [diff] [blame] | 1059 | } |
| 1060 | custom_environment = ce->next; |
| 1061 | xfree(ce->s); |
| 1062 | xfree(ce); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1063 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1064 | } |
| 1065 | |
Damien Miller | f37e246 | 2002-09-19 11:47:55 +1000 | [diff] [blame] | 1066 | /* SSH_CLIENT deprecated */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1067 | snprintf(buf, sizeof buf, "%.50s %d %d", |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1068 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1069 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
| 1070 | |
Damien Miller | 0011138 | 2003-03-10 11:21:17 +1100 | [diff] [blame] | 1071 | laddr = get_local_ipaddr(packet_get_connection_in()); |
Damien Miller | f37e246 | 2002-09-19 11:47:55 +1000 | [diff] [blame] | 1072 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
Damien Miller | 0011138 | 2003-03-10 11:21:17 +1100 | [diff] [blame] | 1073 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
| 1074 | xfree(laddr); |
Damien Miller | f37e246 | 2002-09-19 11:47:55 +1000 | [diff] [blame] | 1075 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
| 1076 | |
Ben Lindstrom | 86fe868 | 2001-03-17 00:32:57 +0000 | [diff] [blame] | 1077 | if (s->ttyfd != -1) |
| 1078 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); |
| 1079 | if (s->term) |
| 1080 | child_set_env(&env, &envsize, "TERM", s->term); |
| 1081 | if (s->display) |
| 1082 | child_set_env(&env, &envsize, "DISPLAY", s->display); |
Damien Miller | 7b28dc5 | 2000-09-05 13:34:53 +1100 | [diff] [blame] | 1083 | if (original_command) |
| 1084 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", |
| 1085 | original_command); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1086 | |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 1087 | #ifdef _UNICOS |
| 1088 | if (cray_tmpdir[0] != '\0') |
| 1089 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); |
| 1090 | #endif /* _UNICOS */ |
| 1091 | |
Darren Tucker | 9dc6c7d | 2005-02-02 18:30:33 +1100 | [diff] [blame] | 1092 | /* |
| 1093 | * Since we clear KRB5CCNAME at startup, if it's set now then it |
| 1094 | * must have been set by a native authentication method (eg AIX or |
| 1095 | * SIA), so copy it to the child. |
| 1096 | */ |
| 1097 | { |
| 1098 | char *cp; |
| 1099 | |
| 1100 | if ((cp = getenv("KRB5CCNAME")) != NULL) |
| 1101 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); |
| 1102 | } |
| 1103 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1104 | #ifdef _AIX |
Ben Lindstrom | 839ac4f | 2002-02-24 20:42:46 +0000 | [diff] [blame] | 1105 | { |
| 1106 | char *cp; |
| 1107 | |
| 1108 | if ((cp = getenv("AUTHSTATE")) != NULL) |
| 1109 | child_set_env(&env, &envsize, "AUTHSTATE", cp); |
Ben Lindstrom | 839ac4f | 2002-02-24 20:42:46 +0000 | [diff] [blame] | 1110 | read_environment_file(&env, &envsize, "/etc/environment"); |
| 1111 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1112 | #endif |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 1113 | #ifdef KRB5 |
Damien Miller | 9c870f9 | 2004-04-16 22:47:55 +1000 | [diff] [blame] | 1114 | if (s->authctxt->krb5_ccname) |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 1115 | child_set_env(&env, &envsize, "KRB5CCNAME", |
Damien Miller | 9c870f9 | 2004-04-16 22:47:55 +1000 | [diff] [blame] | 1116 | s->authctxt->krb5_ccname); |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 1117 | #endif |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1118 | #ifdef USE_PAM |
Kevin Steves | 38b050a | 2002-07-23 00:44:07 +0000 | [diff] [blame] | 1119 | /* |
| 1120 | * Pull in any environment variables that may have |
| 1121 | * been set by PAM. |
| 1122 | */ |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 1123 | if (options.use_pam) { |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 1124 | char **p; |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 1125 | |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 1126 | p = fetch_pam_child_environment(); |
| 1127 | copy_environment(p, &env, &envsize); |
| 1128 | free_pam_environment(p); |
Kevin Steves | 38b050a | 2002-07-23 00:44:07 +0000 | [diff] [blame] | 1129 | |
Damien Miller | c756e9b | 2003-11-17 21:41:42 +1100 | [diff] [blame] | 1130 | p = fetch_pam_environment(); |
Kevin Steves | 38b050a | 2002-07-23 00:44:07 +0000 | [diff] [blame] | 1131 | copy_environment(p, &env, &envsize); |
| 1132 | free_pam_environment(p); |
| 1133 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1134 | #endif /* USE_PAM */ |
| 1135 | |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 1136 | if (auth_sock_name != NULL) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1137 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 1138 | auth_sock_name); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1139 | |
| 1140 | /* read $HOME/.ssh/environment. */ |
Ben Lindstrom | 5d860f0 | 2002-08-01 01:28:38 +0000 | [diff] [blame] | 1141 | if (options.permit_user_env && !options.use_login) { |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 1142 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
Damien Miller | e9994cb | 2002-09-10 21:43:53 +1000 | [diff] [blame] | 1143 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1144 | read_environment_file(&env, &envsize, buf); |
| 1145 | } |
| 1146 | if (debug_flag) { |
| 1147 | /* dump the environment */ |
| 1148 | fprintf(stderr, "Environment:\n"); |
| 1149 | for (i = 0; env[i]; i++) |
| 1150 | fprintf(stderr, " %.200s\n", env[i]); |
| 1151 | } |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1152 | return env; |
| 1153 | } |
| 1154 | |
| 1155 | /* |
| 1156 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found |
| 1157 | * first in this order). |
| 1158 | */ |
| 1159 | static void |
| 1160 | do_rc_files(Session *s, const char *shell) |
| 1161 | { |
| 1162 | FILE *f = NULL; |
| 1163 | char cmd[1024]; |
| 1164 | int do_xauth; |
| 1165 | struct stat st; |
| 1166 | |
| 1167 | do_xauth = |
| 1168 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; |
| 1169 | |
| 1170 | /* ignore _PATH_SSH_USER_RC for subsystems */ |
| 1171 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { |
| 1172 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", |
| 1173 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); |
| 1174 | if (debug_flag) |
| 1175 | fprintf(stderr, "Running %s\n", cmd); |
| 1176 | f = popen(cmd, "w"); |
| 1177 | if (f) { |
| 1178 | if (do_xauth) |
| 1179 | fprintf(f, "%s %s\n", s->auth_proto, |
| 1180 | s->auth_data); |
| 1181 | pclose(f); |
| 1182 | } else |
| 1183 | fprintf(stderr, "Could not run %s\n", |
| 1184 | _PATH_SSH_USER_RC); |
| 1185 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { |
| 1186 | if (debug_flag) |
| 1187 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, |
| 1188 | _PATH_SSH_SYSTEM_RC); |
| 1189 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); |
| 1190 | if (f) { |
| 1191 | if (do_xauth) |
| 1192 | fprintf(f, "%s %s\n", s->auth_proto, |
| 1193 | s->auth_data); |
| 1194 | pclose(f); |
| 1195 | } else |
| 1196 | fprintf(stderr, "Could not run %s\n", |
| 1197 | _PATH_SSH_SYSTEM_RC); |
| 1198 | } else if (do_xauth && options.xauth_location != NULL) { |
| 1199 | /* Add authority data to .Xauthority if appropriate. */ |
| 1200 | if (debug_flag) { |
| 1201 | fprintf(stderr, |
Ben Lindstrom | 611797e | 2002-12-23 02:15:57 +0000 | [diff] [blame] | 1202 | "Running %.500s remove %.100s\n", |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 1203 | options.xauth_location, s->auth_display); |
Ben Lindstrom | 611797e | 2002-12-23 02:15:57 +0000 | [diff] [blame] | 1204 | fprintf(stderr, |
| 1205 | "%.500s add %.100s %.100s %.100s\n", |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1206 | options.xauth_location, s->auth_display, |
| 1207 | s->auth_proto, s->auth_data); |
| 1208 | } |
| 1209 | snprintf(cmd, sizeof cmd, "%s -q -", |
| 1210 | options.xauth_location); |
| 1211 | f = popen(cmd, "w"); |
| 1212 | if (f) { |
Ben Lindstrom | 611797e | 2002-12-23 02:15:57 +0000 | [diff] [blame] | 1213 | fprintf(f, "remove %s\n", |
| 1214 | s->auth_display); |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1215 | fprintf(f, "add %s %s %s\n", |
| 1216 | s->auth_display, s->auth_proto, |
| 1217 | s->auth_data); |
| 1218 | pclose(f); |
| 1219 | } else { |
| 1220 | fprintf(stderr, "Could not run %s\n", |
| 1221 | cmd); |
| 1222 | } |
| 1223 | } |
| 1224 | } |
| 1225 | |
| 1226 | static void |
| 1227 | do_nologin(struct passwd *pw) |
| 1228 | { |
| 1229 | FILE *f = NULL; |
| 1230 | char buf[1024]; |
| 1231 | |
| 1232 | #ifdef HAVE_LOGIN_CAP |
| 1233 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) |
| 1234 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, |
| 1235 | _PATH_NOLOGIN), "r"); |
| 1236 | #else |
| 1237 | if (pw->pw_uid) |
| 1238 | f = fopen(_PATH_NOLOGIN, "r"); |
| 1239 | #endif |
| 1240 | if (f) { |
| 1241 | /* /etc/nologin exists. Print its contents and exit. */ |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1242 | logit("User %.100s not allowed because %s exists", |
Damien Miller | a6eb2b7 | 2002-09-19 11:50:48 +1000 | [diff] [blame] | 1243 | pw->pw_name, _PATH_NOLOGIN); |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1244 | while (fgets(buf, sizeof(buf), f)) |
| 1245 | fputs(buf, stderr); |
| 1246 | fclose(f); |
Damien Miller | f25c18d | 2003-01-07 17:38:58 +1100 | [diff] [blame] | 1247 | fflush(NULL); |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1248 | exit(254); |
| 1249 | } |
| 1250 | } |
| 1251 | |
| 1252 | /* Set login name, uid, gid, and groups. */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1253 | void |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1254 | do_setusercontext(struct passwd *pw) |
| 1255 | { |
Damien Miller | 1a3ccb0 | 2003-02-24 13:04:01 +1100 | [diff] [blame] | 1256 | #ifndef HAVE_CYGWIN |
| 1257 | if (getuid() == 0 || geteuid() == 0) |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1258 | #endif /* HAVE_CYGWIN */ |
Damien Miller | 1a3ccb0 | 2003-02-24 13:04:01 +1100 | [diff] [blame] | 1259 | { |
| 1260 | |
Ben Lindstrom | f0bfa83 | 2002-06-21 00:01:18 +0000 | [diff] [blame] | 1261 | #ifdef HAVE_SETPCRED |
Darren Tucker | 793e817 | 2003-07-08 21:01:04 +1000 | [diff] [blame] | 1262 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
| 1263 | fatal("Failed to set process credentials"); |
Ben Lindstrom | f0bfa83 | 2002-06-21 00:01:18 +0000 | [diff] [blame] | 1264 | #endif /* HAVE_SETPCRED */ |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1265 | #ifdef HAVE_LOGIN_CAP |
Ben Lindstrom | 938b828 | 2002-07-15 17:58:34 +0000 | [diff] [blame] | 1266 | # ifdef __bsdi__ |
Damien Miller | f18cd16 | 2002-06-26 19:12:59 +1000 | [diff] [blame] | 1267 | setpgid(0, 0); |
Ben Lindstrom | 938b828 | 2002-07-15 17:58:34 +0000 | [diff] [blame] | 1268 | # endif |
Darren Tucker | c97b01a | 2005-02-16 16:47:37 +1100 | [diff] [blame] | 1269 | #ifdef GSSAPI |
| 1270 | if (options.gss_authentication) { |
| 1271 | temporarily_use_uid(pw); |
| 1272 | ssh_gssapi_storecreds(); |
| 1273 | restore_uid(); |
| 1274 | } |
| 1275 | #endif |
Damien Miller | d352636 | 2004-01-23 14:16:26 +1100 | [diff] [blame] | 1276 | # ifdef USE_PAM |
| 1277 | if (options.use_pam) { |
| 1278 | do_pam_session(); |
| 1279 | do_pam_setcred(0); |
| 1280 | } |
| 1281 | # endif /* USE_PAM */ |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1282 | if (setusercontext(lc, pw, pw->pw_uid, |
| 1283 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { |
| 1284 | perror("unable to set user context"); |
| 1285 | exit(1); |
| 1286 | } |
| 1287 | #else |
| 1288 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) |
| 1289 | /* Sets login uid for accounting */ |
| 1290 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) |
| 1291 | error("setluid: %s", strerror(errno)); |
| 1292 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ |
| 1293 | |
| 1294 | if (setlogin(pw->pw_name) < 0) |
| 1295 | error("setlogin failed: %s", strerror(errno)); |
| 1296 | if (setgid(pw->pw_gid) < 0) { |
| 1297 | perror("setgid"); |
| 1298 | exit(1); |
| 1299 | } |
| 1300 | /* Initialize the group list. */ |
| 1301 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { |
| 1302 | perror("initgroups"); |
| 1303 | exit(1); |
| 1304 | } |
| 1305 | endgrent(); |
Darren Tucker | c97b01a | 2005-02-16 16:47:37 +1100 | [diff] [blame] | 1306 | #ifdef GSSAPI |
| 1307 | if (options.gss_authentication) { |
| 1308 | temporarily_use_uid(pw); |
| 1309 | ssh_gssapi_storecreds(); |
| 1310 | restore_uid(); |
| 1311 | } |
| 1312 | #endif |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1313 | # ifdef USE_PAM |
| 1314 | /* |
Damien Miller | a8e06ce | 2003-11-21 23:48:55 +1100 | [diff] [blame] | 1315 | * PAM credentials may take the form of supplementary groups. |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1316 | * These will have been wiped by the above initgroups() call. |
| 1317 | * Reestablish them here. |
| 1318 | */ |
Damien Miller | 341c6e6 | 2003-09-02 23:18:52 +1000 | [diff] [blame] | 1319 | if (options.use_pam) { |
| 1320 | do_pam_session(); |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 1321 | do_pam_setcred(0); |
Damien Miller | 341c6e6 | 2003-09-02 23:18:52 +1000 | [diff] [blame] | 1322 | } |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1323 | # endif /* USE_PAM */ |
| 1324 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) |
| 1325 | irix_setusercontext(pw); |
| 1326 | # 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] | 1327 | # ifdef _AIX |
Ben Lindstrom | 51b2488 | 2002-07-04 03:08:40 +0000 | [diff] [blame] | 1328 | aix_usrinfo(pw); |
Ben Lindstrom | b129be6 | 2002-06-25 17:12:26 +0000 | [diff] [blame] | 1329 | # endif /* _AIX */ |
Tim Rice | 66fd217 | 2005-08-31 09:59:49 -0700 | [diff] [blame] | 1330 | #if defined(HAVE_LIBIAF) && !defined(BROKEN_LIBIAF) |
Tim Rice | 2291c00 | 2005-08-26 13:15:19 -0700 | [diff] [blame] | 1331 | if (set_id(pw->pw_name) != 0) { |
| 1332 | exit(1); |
| 1333 | } |
Tim Rice | 66fd217 | 2005-08-31 09:59:49 -0700 | [diff] [blame] | 1334 | #endif /* HAVE_LIBIAF && !BROKEN_LIBIAF */ |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1335 | /* Permanently switch to the desired uid. */ |
| 1336 | permanently_set_uid(pw); |
| 1337 | #endif |
| 1338 | } |
Damien Miller | 1a3ccb0 | 2003-02-24 13:04:01 +1100 | [diff] [blame] | 1339 | |
| 1340 | #ifdef HAVE_CYGWIN |
| 1341 | if (is_winnt) |
| 1342 | #endif |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1343 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
| 1344 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); |
| 1345 | } |
| 1346 | |
Ben Lindstrom | 0810519 | 2002-03-22 02:50:06 +0000 | [diff] [blame] | 1347 | static void |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1348 | do_pwchange(Session *s) |
| 1349 | { |
Darren Tucker | 0999174 | 2004-07-17 17:05:14 +1000 | [diff] [blame] | 1350 | fflush(NULL); |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1351 | fprintf(stderr, "WARNING: Your password has expired.\n"); |
| 1352 | if (s->ttyfd != -1) { |
Darren Tucker | fc95970 | 2004-07-17 16:12:08 +1000 | [diff] [blame] | 1353 | fprintf(stderr, |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1354 | "You must change your password now and login again!\n"); |
Darren Tucker | 33370e0 | 2005-02-09 22:17:28 +1100 | [diff] [blame] | 1355 | #ifdef PASSWD_NEEDS_USERNAME |
| 1356 | execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name, |
| 1357 | (char *)NULL); |
| 1358 | #else |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1359 | execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL); |
Darren Tucker | 33370e0 | 2005-02-09 22:17:28 +1100 | [diff] [blame] | 1360 | #endif |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1361 | perror("passwd"); |
| 1362 | } else { |
| 1363 | fprintf(stderr, |
| 1364 | "Password change required but no TTY available.\n"); |
| 1365 | } |
| 1366 | exit(1); |
| 1367 | } |
| 1368 | |
| 1369 | static void |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1370 | launch_login(struct passwd *pw, const char *hostname) |
| 1371 | { |
| 1372 | /* Launch login(1). */ |
| 1373 | |
Ben Lindstrom | 378a417 | 2002-06-07 14:49:56 +0000 | [diff] [blame] | 1374 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
Kevin Steves | b4799a3 | 2002-03-24 23:19:54 +0000 | [diff] [blame] | 1375 | #ifdef xxxLOGIN_NEEDS_TERM |
Ben Lindstrom | 5a6abda | 2002-06-09 19:41:48 +0000 | [diff] [blame] | 1376 | (s->term ? s->term : "unknown"), |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1377 | #endif /* LOGIN_NEEDS_TERM */ |
Kevin Steves | 5feaaef | 2002-04-23 20:45:55 +0000 | [diff] [blame] | 1378 | #ifdef LOGIN_NO_ENDOPT |
| 1379 | "-p", "-f", pw->pw_name, (char *)NULL); |
| 1380 | #else |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1381 | "-p", "-f", "--", pw->pw_name, (char *)NULL); |
Kevin Steves | 5feaaef | 2002-04-23 20:45:55 +0000 | [diff] [blame] | 1382 | #endif |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1383 | |
| 1384 | /* Login couldn't be executed, die. */ |
| 1385 | |
| 1386 | perror("login"); |
| 1387 | exit(1); |
| 1388 | } |
| 1389 | |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1390 | static void |
| 1391 | child_close_fds(void) |
| 1392 | { |
| 1393 | int i; |
| 1394 | |
| 1395 | if (packet_get_connection_in() == packet_get_connection_out()) |
| 1396 | close(packet_get_connection_in()); |
| 1397 | else { |
| 1398 | close(packet_get_connection_in()); |
| 1399 | close(packet_get_connection_out()); |
| 1400 | } |
| 1401 | /* |
| 1402 | * Close all descriptors related to channels. They will still remain |
| 1403 | * open in the parent. |
| 1404 | */ |
| 1405 | /* XXX better use close-on-exec? -markus */ |
| 1406 | channel_close_all(); |
| 1407 | |
| 1408 | /* |
| 1409 | * Close any extra file descriptors. Note that there may still be |
| 1410 | * descriptors left by system functions. They will be closed later. |
| 1411 | */ |
| 1412 | endpwent(); |
| 1413 | |
| 1414 | /* |
Damien Miller | 788f212 | 2005-11-05 15:14:59 +1100 | [diff] [blame] | 1415 | * 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] | 1416 | * hanging around in clients. Note that we want to do this after |
| 1417 | * initgroups, because at least on Solaris 2.3 it leaves file |
| 1418 | * descriptors open. |
| 1419 | */ |
| 1420 | for (i = 3; i < 64; i++) |
| 1421 | close(i); |
| 1422 | } |
| 1423 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1424 | /* |
| 1425 | * Performs common processing for the child, such as setting up the |
| 1426 | * environment, closing extra file descriptors, setting the user and group |
| 1427 | * ids, and executing the command or shell. |
| 1428 | */ |
| 1429 | void |
| 1430 | do_child(Session *s, const char *command) |
| 1431 | { |
| 1432 | extern char **environ; |
| 1433 | char **env; |
| 1434 | char *argv[10]; |
| 1435 | const char *shell, *shell0, *hostname = NULL; |
| 1436 | struct passwd *pw = s->pw; |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1437 | |
| 1438 | /* remove hostkey from the child's memory */ |
| 1439 | destroy_sensitive_data(); |
| 1440 | |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1441 | /* Force a password change */ |
| 1442 | if (s->authctxt->force_pwchange) { |
| 1443 | do_setusercontext(pw); |
| 1444 | child_close_fds(); |
| 1445 | do_pwchange(s); |
| 1446 | exit(1); |
| 1447 | } |
| 1448 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1449 | /* login(1) is only called if we execute the login shell */ |
| 1450 | if (options.use_login && command != NULL) |
| 1451 | options.use_login = 0; |
| 1452 | |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 1453 | #ifdef _UNICOS |
| 1454 | cray_setup(pw->pw_uid, pw->pw_name, command); |
| 1455 | #endif /* _UNICOS */ |
| 1456 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1457 | /* |
| 1458 | * Login(1) does this as well, and it needs uid 0 for the "-h" |
| 1459 | * switch, so we let login(1) to this for us. |
| 1460 | */ |
| 1461 | if (!options.use_login) { |
| 1462 | #ifdef HAVE_OSF_SIA |
Ben Lindstrom | c8c548d | 2003-03-21 01:18:09 +0000 | [diff] [blame] | 1463 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1464 | if (!check_quietlogin(s, command)) |
| 1465 | do_motd(); |
| 1466 | #else /* HAVE_OSF_SIA */ |
Darren Tucker | 42308a4 | 2005-10-30 15:31:55 +1100 | [diff] [blame] | 1467 | /* When PAM is enabled we rely on it to do the nologin check */ |
| 1468 | if (!options.use_pam) |
| 1469 | do_nologin(pw); |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1470 | do_setusercontext(pw); |
Darren Tucker | 0a44d1e | 2004-07-01 09:48:29 +1000 | [diff] [blame] | 1471 | /* |
| 1472 | * PAM session modules in do_setusercontext may have |
| 1473 | * generated messages, so if this in an interactive |
| 1474 | * login then display them too. |
| 1475 | */ |
Darren Tucker | a2a3ed0 | 2004-09-11 23:09:53 +1000 | [diff] [blame] | 1476 | if (!check_quietlogin(s, command)) |
Darren Tucker | 0a44d1e | 2004-07-01 09:48:29 +1000 | [diff] [blame] | 1477 | display_loginmsg(); |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1478 | #endif /* HAVE_OSF_SIA */ |
| 1479 | } |
| 1480 | |
Darren Tucker | 69687f4 | 2004-09-11 22:17:26 +1000 | [diff] [blame] | 1481 | #ifdef USE_PAM |
Darren Tucker | 4855415 | 2005-04-21 19:50:55 +1000 | [diff] [blame] | 1482 | if (options.use_pam && !options.use_login && !is_pam_session_open()) { |
| 1483 | debug3("PAM session not opened, exiting"); |
Darren Tucker | 69687f4 | 2004-09-11 22:17:26 +1000 | [diff] [blame] | 1484 | display_loginmsg(); |
| 1485 | exit(254); |
| 1486 | } |
| 1487 | #endif |
| 1488 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1489 | /* |
| 1490 | * Get the shell from the password data. An empty shell field is |
| 1491 | * legal, and means /bin/sh. |
| 1492 | */ |
| 1493 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; |
Ben Lindstrom | 4676760 | 2002-12-23 02:26:08 +0000 | [diff] [blame] | 1494 | |
| 1495 | /* |
| 1496 | * Make sure $SHELL points to the shell from the password file, |
| 1497 | * even if shell is overridden from login.conf |
| 1498 | */ |
| 1499 | env = do_setup_env(s, shell); |
| 1500 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1501 | #ifdef HAVE_LOGIN_CAP |
| 1502 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); |
| 1503 | #endif |
| 1504 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1505 | /* we have to stash the hostname before we close our socket. */ |
| 1506 | if (options.use_login) |
Ben Lindstrom | f15a386 | 2001-04-05 23:32:17 +0000 | [diff] [blame] | 1507 | hostname = get_remote_name_or_ip(utmp_len, |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 1508 | options.use_dns); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1509 | /* |
| 1510 | * Close the connection descriptors; note that this is the child, and |
| 1511 | * the server will still have the socket open, and it is important |
| 1512 | * that we do not shutdown it. Note that the descriptors cannot be |
| 1513 | * closed before building the environment, as we call |
| 1514 | * get_remote_ipaddr there. |
| 1515 | */ |
Darren Tucker | 23bc8d0 | 2004-02-06 16:24:31 +1100 | [diff] [blame] | 1516 | child_close_fds(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1517 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1518 | /* |
Damien Miller | 05eda43 | 2002-02-10 18:32:28 +1100 | [diff] [blame] | 1519 | * Must take new environment into use so that .ssh/rc, |
| 1520 | * /etc/ssh/sshrc and xauth are run in the proper environment. |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1521 | */ |
| 1522 | environ = env; |
| 1523 | |
Darren Tucker | 3c78c5e | 2004-01-23 22:03:10 +1100 | [diff] [blame] | 1524 | #if defined(KRB5) && defined(USE_AFS) |
Darren Tucker | 22ef508 | 2003-12-31 11:37:34 +1100 | [diff] [blame] | 1525 | /* |
| 1526 | * At this point, we check to see if AFS is active and if we have |
| 1527 | * a valid Kerberos 5 TGT. If so, it seems like a good idea to see |
| 1528 | * if we can (and need to) extend the ticket into an AFS token. If |
| 1529 | * we don't do this, we run into potential problems if the user's |
| 1530 | * home directory is in AFS and it's not world-readable. |
| 1531 | */ |
| 1532 | |
| 1533 | if (options.kerberos_get_afs_token && k_hasafs() && |
Damien Miller | 0dc1bef | 2005-07-17 17:22:45 +1000 | [diff] [blame] | 1534 | (s->authctxt->krb5_ctx != NULL)) { |
Darren Tucker | 22ef508 | 2003-12-31 11:37:34 +1100 | [diff] [blame] | 1535 | char cell[64]; |
| 1536 | |
| 1537 | debug("Getting AFS token"); |
| 1538 | |
| 1539 | k_setpag(); |
| 1540 | |
| 1541 | if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0) |
| 1542 | krb5_afslog(s->authctxt->krb5_ctx, |
| 1543 | s->authctxt->krb5_fwd_ccache, cell, NULL); |
| 1544 | |
| 1545 | krb5_afslog_home(s->authctxt->krb5_ctx, |
| 1546 | s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir); |
| 1547 | } |
| 1548 | #endif |
| 1549 | |
Damien Miller | 788f212 | 2005-11-05 15:14:59 +1100 | [diff] [blame] | 1550 | /* Change current directory to the user's home directory. */ |
Damien Miller | 139d4cd | 2001-10-10 15:07:44 +1000 | [diff] [blame] | 1551 | if (chdir(pw->pw_dir) < 0) { |
| 1552 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", |
| 1553 | pw->pw_dir, strerror(errno)); |
| 1554 | #ifdef HAVE_LOGIN_CAP |
| 1555 | if (login_getcapbool(lc, "requirehome", 0)) |
| 1556 | exit(1); |
| 1557 | #endif |
| 1558 | } |
| 1559 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1560 | if (!options.use_login) |
| 1561 | do_rc_files(s, shell); |
Ben Lindstrom | de71cda | 2001-03-24 00:43:26 +0000 | [diff] [blame] | 1562 | |
| 1563 | /* restore SIGPIPE for child */ |
| 1564 | signal(SIGPIPE, SIG_DFL); |
| 1565 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1566 | if (options.use_login) { |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1567 | launch_login(pw, hostname); |
| 1568 | /* NEVERREACHED */ |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1569 | } |
| 1570 | |
| 1571 | /* Get the last component of the shell name. */ |
| 1572 | if ((shell0 = strrchr(shell, '/')) != NULL) |
| 1573 | shell0++; |
| 1574 | else |
| 1575 | shell0 = shell; |
| 1576 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1577 | /* |
| 1578 | * If we have no command, execute the shell. In this case, the shell |
| 1579 | * name to be passed in argv[0] is preceded by '-' to indicate that |
| 1580 | * this is a login shell. |
| 1581 | */ |
| 1582 | if (!command) { |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1583 | char argv0[256]; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1584 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1585 | /* Start the shell. Set initial character to '-'. */ |
| 1586 | argv0[0] = '-'; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1587 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1588 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
| 1589 | >= sizeof(argv0) - 1) { |
| 1590 | errno = EINVAL; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1591 | perror(shell); |
| 1592 | exit(1); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1593 | } |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1594 | |
| 1595 | /* Execute the shell. */ |
| 1596 | argv[0] = argv0; |
| 1597 | argv[1] = NULL; |
| 1598 | execve(shell, argv, env); |
| 1599 | |
| 1600 | /* Executing the shell failed. */ |
| 1601 | perror(shell); |
| 1602 | exit(1); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1603 | } |
| 1604 | /* |
| 1605 | * Execute the command using the user's shell. This uses the -c |
| 1606 | * option to execute the command. |
| 1607 | */ |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1608 | argv[0] = (char *) shell0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1609 | argv[1] = "-c"; |
| 1610 | argv[2] = (char *) command; |
| 1611 | argv[3] = NULL; |
| 1612 | execve(shell, argv, env); |
| 1613 | perror(shell); |
| 1614 | exit(1); |
| 1615 | } |
| 1616 | |
| 1617 | Session * |
| 1618 | session_new(void) |
| 1619 | { |
| 1620 | int i; |
| 1621 | static int did_init = 0; |
| 1622 | if (!did_init) { |
| 1623 | debug("session_new: init"); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1624 | for (i = 0; i < MAX_SESSIONS; i++) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1625 | sessions[i].used = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1626 | } |
| 1627 | did_init = 1; |
| 1628 | } |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1629 | for (i = 0; i < MAX_SESSIONS; i++) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1630 | Session *s = &sessions[i]; |
| 1631 | if (! s->used) { |
Ben Lindstrom | 6029432 | 2001-03-26 05:38:25 +0000 | [diff] [blame] | 1632 | memset(s, 0, sizeof(*s)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1633 | s->chanid = -1; |
| 1634 | s->ptyfd = -1; |
| 1635 | s->ttyfd = -1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1636 | s->used = 1; |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 1637 | s->self = i; |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 1638 | s->x11_chanids = NULL; |
Damien Miller | 15b2952 | 2000-10-14 12:33:48 +1100 | [diff] [blame] | 1639 | debug("session_new: session %d", i); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1640 | return s; |
| 1641 | } |
| 1642 | } |
| 1643 | return NULL; |
| 1644 | } |
| 1645 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1646 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1647 | session_dump(void) |
| 1648 | { |
| 1649 | int i; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1650 | for (i = 0; i < MAX_SESSIONS; i++) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1651 | Session *s = &sessions[i]; |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 1652 | debug("dump: used %d session %d %p channel %d pid %ld", |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1653 | s->used, |
| 1654 | s->self, |
| 1655 | s, |
| 1656 | s->chanid, |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 1657 | (long)s->pid); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1658 | } |
| 1659 | } |
| 1660 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1661 | int |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 1662 | session_open(Authctxt *authctxt, int chanid) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1663 | { |
| 1664 | Session *s = session_new(); |
| 1665 | debug("session_open: channel %d", chanid); |
| 1666 | if (s == NULL) { |
| 1667 | error("no more sessions"); |
| 1668 | return 0; |
| 1669 | } |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 1670 | s->authctxt = authctxt; |
| 1671 | s->pw = authctxt->pw; |
Damien Miller | 3e3b514 | 2003-11-17 21:13:40 +1100 | [diff] [blame] | 1672 | if (s->pw == NULL || !authctxt->valid) |
Kevin Steves | 43cdef3 | 2001-02-11 14:12:08 +0000 | [diff] [blame] | 1673 | fatal("no user for session %d", s->self); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1674 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
| 1675 | s->chanid = chanid; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1676 | return 1; |
| 1677 | } |
| 1678 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1679 | Session * |
| 1680 | session_by_tty(char *tty) |
| 1681 | { |
| 1682 | int i; |
| 1683 | for (i = 0; i < MAX_SESSIONS; i++) { |
| 1684 | Session *s = &sessions[i]; |
| 1685 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { |
| 1686 | debug("session_by_tty: session %d tty %s", i, tty); |
| 1687 | return s; |
| 1688 | } |
| 1689 | } |
| 1690 | debug("session_by_tty: unknown tty %.100s", tty); |
| 1691 | session_dump(); |
| 1692 | return NULL; |
| 1693 | } |
| 1694 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1695 | static Session * |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1696 | session_by_channel(int id) |
| 1697 | { |
| 1698 | int i; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1699 | for (i = 0; i < MAX_SESSIONS; i++) { |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1700 | Session *s = &sessions[i]; |
| 1701 | if (s->used && s->chanid == id) { |
| 1702 | debug("session_by_channel: session %d channel %d", i, id); |
| 1703 | return s; |
| 1704 | } |
| 1705 | } |
| 1706 | debug("session_by_channel: unknown channel %d", id); |
| 1707 | session_dump(); |
| 1708 | return NULL; |
| 1709 | } |
| 1710 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1711 | static Session * |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 1712 | session_by_x11_channel(int id) |
| 1713 | { |
| 1714 | int i, j; |
| 1715 | |
| 1716 | for (i = 0; i < MAX_SESSIONS; i++) { |
| 1717 | Session *s = &sessions[i]; |
| 1718 | |
| 1719 | if (s->x11_chanids == NULL || !s->used) |
| 1720 | continue; |
| 1721 | for (j = 0; s->x11_chanids[j] != -1; j++) { |
| 1722 | if (s->x11_chanids[j] == id) { |
| 1723 | debug("session_by_x11_channel: session %d " |
| 1724 | "channel %d", s->self, id); |
| 1725 | return s; |
| 1726 | } |
| 1727 | } |
| 1728 | } |
| 1729 | debug("session_by_x11_channel: unknown channel %d", id); |
| 1730 | session_dump(); |
| 1731 | return NULL; |
| 1732 | } |
| 1733 | |
| 1734 | static Session * |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1735 | session_by_pid(pid_t pid) |
| 1736 | { |
| 1737 | int i; |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 1738 | debug("session_by_pid: pid %ld", (long)pid); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1739 | for (i = 0; i < MAX_SESSIONS; i++) { |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1740 | Session *s = &sessions[i]; |
| 1741 | if (s->used && s->pid == pid) |
| 1742 | return s; |
| 1743 | } |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 1744 | error("session_by_pid: unknown pid %ld", (long)pid); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1745 | session_dump(); |
| 1746 | return NULL; |
| 1747 | } |
| 1748 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1749 | static int |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1750 | session_window_change_req(Session *s) |
| 1751 | { |
| 1752 | s->col = packet_get_int(); |
| 1753 | s->row = packet_get_int(); |
| 1754 | s->xpixel = packet_get_int(); |
| 1755 | s->ypixel = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1756 | packet_check_eom(); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1757 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
| 1758 | return 1; |
| 1759 | } |
| 1760 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1761 | static int |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1762 | session_pty_req(Session *s) |
| 1763 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1764 | u_int len; |
Ben Lindstrom | ae8e2d3 | 2001-04-14 23:13:02 +0000 | [diff] [blame] | 1765 | int n_bytes; |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 1766 | |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1767 | if (no_pty_flag) { |
| 1768 | debug("Allocating a pty not permitted for this authentication."); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1769 | return 0; |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1770 | } |
| 1771 | if (s->ttyfd != -1) { |
| 1772 | packet_disconnect("Protocol error: you already have a pty."); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1773 | return 0; |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1774 | } |
| 1775 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1776 | s->term = packet_get_string(&len); |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1777 | |
| 1778 | if (compat20) { |
| 1779 | s->col = packet_get_int(); |
| 1780 | s->row = packet_get_int(); |
| 1781 | } else { |
| 1782 | s->row = packet_get_int(); |
| 1783 | s->col = packet_get_int(); |
| 1784 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1785 | s->xpixel = packet_get_int(); |
| 1786 | s->ypixel = packet_get_int(); |
| 1787 | |
| 1788 | if (strcmp(s->term, "") == 0) { |
| 1789 | xfree(s->term); |
| 1790 | s->term = NULL; |
| 1791 | } |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1792 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1793 | /* Allocate a pty and open it. */ |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1794 | debug("Allocating pty."); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1795 | 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] | 1796 | if (s->term) |
| 1797 | xfree(s->term); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1798 | s->term = NULL; |
| 1799 | s->ptyfd = -1; |
| 1800 | s->ttyfd = -1; |
| 1801 | error("session_pty_req: session %d alloc failed", s->self); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1802 | return 0; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1803 | } |
| 1804 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1805 | |
| 1806 | /* for SSH1 the tty modes length is not given */ |
| 1807 | if (!compat20) |
| 1808 | n_bytes = packet_remaining(); |
| 1809 | tty_parse_modes(s->ttyfd, &n_bytes); |
| 1810 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1811 | if (!use_privsep) |
| 1812 | pty_setowner(s->pw, s->tty); |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1813 | |
| 1814 | /* Set window size from the packet. */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1815 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
| 1816 | |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1817 | packet_check_eom(); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 1818 | session_proctitle(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1819 | return 1; |
| 1820 | } |
| 1821 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1822 | static int |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1823 | session_subsystem_req(Session *s) |
| 1824 | { |
Damien Miller | ae45246 | 2001-10-10 15:08:06 +1000 | [diff] [blame] | 1825 | struct stat st; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1826 | u_int len; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1827 | int success = 0; |
Damien Miller | ae45246 | 2001-10-10 15:08:06 +1000 | [diff] [blame] | 1828 | char *cmd, *subsys = packet_get_string(&len); |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 1829 | u_int i; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1830 | |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1831 | packet_check_eom(); |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1832 | logit("subsystem request for %.100s", subsys); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1833 | |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1834 | for (i = 0; i < options.num_subsystems; i++) { |
Damien Miller | ae45246 | 2001-10-10 15:08:06 +1000 | [diff] [blame] | 1835 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { |
| 1836 | cmd = options.subsystem_command[i]; |
| 1837 | if (stat(cmd, &st) < 0) { |
| 1838 | error("subsystem: cannot stat %s: %s", cmd, |
| 1839 | strerror(errno)); |
| 1840 | break; |
| 1841 | } |
| 1842 | debug("subsystem: exec() %s", cmd); |
Ben Lindstrom | fc9b07d | 2001-03-22 01:27:23 +0000 | [diff] [blame] | 1843 | s->is_subsystem = 1; |
Damien Miller | ae45246 | 2001-10-10 15:08:06 +1000 | [diff] [blame] | 1844 | do_exec(s, cmd); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1845 | success = 1; |
Damien Miller | 5fab4b9 | 2002-02-05 12:15:07 +1100 | [diff] [blame] | 1846 | break; |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1847 | } |
| 1848 | } |
| 1849 | |
| 1850 | if (!success) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1851 | logit("subsystem request for %.100s failed, subsystem not found", |
Damien Miller | ae45246 | 2001-10-10 15:08:06 +1000 | [diff] [blame] | 1852 | subsys); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1853 | |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1854 | xfree(subsys); |
| 1855 | return success; |
| 1856 | } |
| 1857 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1858 | static int |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1859 | session_x11_req(Session *s) |
| 1860 | { |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 1861 | int success; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1862 | |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 1863 | if (s->auth_proto != NULL || s->auth_data != NULL) { |
| 1864 | error("session_x11_req: session %d: " |
Darren Tucker | 6355187 | 2005-12-20 16:14:15 +1100 | [diff] [blame] | 1865 | "x11 forwarding already active", s->self); |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 1866 | return 0; |
| 1867 | } |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1868 | s->single_connection = packet_get_char(); |
| 1869 | s->auth_proto = packet_get_string(NULL); |
| 1870 | s->auth_data = packet_get_string(NULL); |
| 1871 | s->screen = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1872 | packet_check_eom(); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1873 | |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 1874 | success = session_setup_x11fwd(s); |
| 1875 | if (!success) { |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1876 | xfree(s->auth_proto); |
| 1877 | xfree(s->auth_data); |
Ben Lindstrom | 88259fb | 2001-06-12 00:21:34 +0000 | [diff] [blame] | 1878 | s->auth_proto = NULL; |
| 1879 | s->auth_data = NULL; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1880 | } |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 1881 | return success; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1882 | } |
| 1883 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1884 | static int |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1885 | session_shell_req(Session *s) |
| 1886 | { |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1887 | packet_check_eom(); |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 1888 | do_exec(s, NULL); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1889 | return 1; |
| 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_exec_req(Session *s) |
| 1894 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1895 | u_int len; |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1896 | char *command = packet_get_string(&len); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1897 | packet_check_eom(); |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 1898 | do_exec(s, command); |
Ben Lindstrom | 0a7ca6c | 2001-06-21 03:17:42 +0000 | [diff] [blame] | 1899 | xfree(command); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1900 | return 1; |
| 1901 | } |
| 1902 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1903 | static int |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 1904 | session_break_req(Session *s) |
| 1905 | { |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 1906 | |
Darren Tucker | 1f8311c | 2004-05-13 16:39:33 +1000 | [diff] [blame] | 1907 | packet_get_int(); /* ignored */ |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 1908 | packet_check_eom(); |
| 1909 | |
Darren Tucker | 3bdbd84 | 2003-08-13 20:31:05 +1000 | [diff] [blame] | 1910 | if (s->ttyfd == -1 || |
| 1911 | tcsendbreak(s->ttyfd, 0) < 0) |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 1912 | return 0; |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 1913 | return 1; |
| 1914 | } |
| 1915 | |
| 1916 | static int |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 1917 | session_env_req(Session *s) |
| 1918 | { |
| 1919 | char *name, *val; |
| 1920 | u_int name_len, val_len, i; |
| 1921 | |
| 1922 | name = packet_get_string(&name_len); |
| 1923 | val = packet_get_string(&val_len); |
| 1924 | packet_check_eom(); |
| 1925 | |
| 1926 | /* Don't set too many environment variables */ |
| 1927 | if (s->num_env > 128) { |
| 1928 | debug2("Ignoring env request %s: too many env vars", name); |
| 1929 | goto fail; |
| 1930 | } |
| 1931 | |
| 1932 | for (i = 0; i < options.num_accept_env; i++) { |
| 1933 | if (match_pattern(name, options.accept_env[i])) { |
| 1934 | debug2("Setting env %d: %s=%s", s->num_env, name, val); |
| 1935 | s->env = xrealloc(s->env, sizeof(*s->env) * |
| 1936 | (s->num_env + 1)); |
| 1937 | s->env[s->num_env].name = name; |
| 1938 | s->env[s->num_env].val = val; |
| 1939 | s->num_env++; |
| 1940 | return (1); |
| 1941 | } |
| 1942 | } |
| 1943 | debug2("Ignoring env request %s: disallowed name", name); |
| 1944 | |
| 1945 | fail: |
| 1946 | xfree(name); |
| 1947 | xfree(val); |
| 1948 | return (0); |
| 1949 | } |
| 1950 | |
| 1951 | static int |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1952 | session_auth_agent_req(Session *s) |
| 1953 | { |
| 1954 | static int called = 0; |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1955 | packet_check_eom(); |
Ben Lindstrom | 1492029 | 2000-11-21 21:24:55 +0000 | [diff] [blame] | 1956 | if (no_agent_forwarding_flag) { |
| 1957 | debug("session_auth_agent_req: no_agent_forwarding_flag"); |
| 1958 | return 0; |
| 1959 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1960 | if (called) { |
| 1961 | return 0; |
| 1962 | } else { |
| 1963 | called = 1; |
| 1964 | return auth_input_request_forwarding(s->pw); |
| 1965 | } |
| 1966 | } |
| 1967 | |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1968 | int |
| 1969 | session_input_channel_req(Channel *c, const char *rtype) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1970 | { |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1971 | int success = 0; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1972 | Session *s; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1973 | |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1974 | if ((s = session_by_channel(c->self)) == NULL) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1975 | logit("session_input_channel_req: no session %d req %.100s", |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1976 | c->self, rtype); |
| 1977 | return 0; |
| 1978 | } |
| 1979 | debug("session_input_channel_req: session %d req %s", s->self, rtype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1980 | |
| 1981 | /* |
Ben Lindstrom | fc9b07d | 2001-03-22 01:27:23 +0000 | [diff] [blame] | 1982 | * a session is in LARVAL state until a shell, a command |
| 1983 | * or a subsystem is executed |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1984 | */ |
| 1985 | if (c->type == SSH_CHANNEL_LARVAL) { |
| 1986 | if (strcmp(rtype, "shell") == 0) { |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1987 | success = session_shell_req(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1988 | } else if (strcmp(rtype, "exec") == 0) { |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1989 | success = session_exec_req(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1990 | } else if (strcmp(rtype, "pty-req") == 0) { |
Damien Miller | 5f05637 | 2000-04-16 12:31:48 +1000 | [diff] [blame] | 1991 | success = session_pty_req(s); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1992 | } else if (strcmp(rtype, "x11-req") == 0) { |
| 1993 | success = session_x11_req(s); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1994 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
| 1995 | success = session_auth_agent_req(s); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1996 | } else if (strcmp(rtype, "subsystem") == 0) { |
| 1997 | success = session_subsystem_req(s); |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 1998 | } else if (strcmp(rtype, "env") == 0) { |
| 1999 | success = session_env_req(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2000 | } |
| 2001 | } |
| 2002 | if (strcmp(rtype, "window-change") == 0) { |
| 2003 | success = session_window_change_req(s); |
Damien Miller | a6b1d16 | 2004-06-30 22:41:07 +1000 | [diff] [blame] | 2004 | } else if (strcmp(rtype, "break") == 0) { |
| 2005 | success = session_break_req(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2006 | } |
Damien Miller | a6b1d16 | 2004-06-30 22:41:07 +1000 | [diff] [blame] | 2007 | |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 2008 | return success; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2009 | } |
| 2010 | |
| 2011 | void |
| 2012 | session_set_fds(Session *s, int fdin, int fdout, int fderr) |
| 2013 | { |
| 2014 | if (!compat20) |
| 2015 | fatal("session_set_fds: called for proto != 2.0"); |
| 2016 | /* |
| 2017 | * now that have a child and a pipe to the child, |
| 2018 | * we can activate our channel and register the fd's |
| 2019 | */ |
| 2020 | if (s->chanid == -1) |
| 2021 | fatal("no channel for session %d", s->self); |
| 2022 | channel_set_fds(s->chanid, |
| 2023 | fdout, fdin, fderr, |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 2024 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
Damien Miller | 19a5945 | 2002-02-19 15:20:57 +1100 | [diff] [blame] | 2025 | 1, |
| 2026 | CHAN_SES_WINDOW_DEFAULT); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2027 | } |
| 2028 | |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 2029 | /* |
| 2030 | * Function to perform pty cleanup. Also called if we get aborted abnormally |
| 2031 | * (e.g., due to a dropped connection). |
| 2032 | */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2033 | void |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2034 | session_pty_cleanup2(Session *s) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2035 | { |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 2036 | if (s == NULL) { |
| 2037 | error("session_pty_cleanup: no session"); |
| 2038 | return; |
| 2039 | } |
| 2040 | if (s->ttyfd == -1) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2041 | return; |
| 2042 | |
Kevin Steves | 43cdef3 | 2001-02-11 14:12:08 +0000 | [diff] [blame] | 2043 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2044 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2045 | /* Record that the user has logged out. */ |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 2046 | if (s->pid != 0) |
Tim Rice | e06ae4a | 2002-02-24 17:56:46 -0800 | [diff] [blame] | 2047 | record_logout(s->pid, s->tty, s->pw->pw_name); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2048 | |
| 2049 | /* Release the pseudo-tty. */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2050 | if (getuid() == 0) |
| 2051 | pty_release(s->tty); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2052 | |
| 2053 | /* |
| 2054 | * Close the server side of the socket pairs. We must do this after |
| 2055 | * the pty cleanup, so that another process doesn't get this pty |
| 2056 | * while we're still cleaning up. |
| 2057 | */ |
| 2058 | if (close(s->ptymaster) < 0) |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2059 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
Damien Miller | 0585d51 | 2001-10-12 11:35:50 +1000 | [diff] [blame] | 2060 | |
| 2061 | /* unlink pty from session */ |
| 2062 | s->ttyfd = -1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 2063 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2064 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2065 | void |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2066 | session_pty_cleanup(Session *s) |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2067 | { |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2068 | PRIVSEP(session_pty_cleanup2(s)); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2069 | } |
| 2070 | |
Damien Miller | 5a80bba | 2002-09-04 16:39:02 +1000 | [diff] [blame] | 2071 | static char * |
| 2072 | sig2name(int sig) |
| 2073 | { |
| 2074 | #define SSH_SIG(x) if (sig == SIG ## x) return #x |
| 2075 | SSH_SIG(ABRT); |
| 2076 | SSH_SIG(ALRM); |
| 2077 | SSH_SIG(FPE); |
| 2078 | SSH_SIG(HUP); |
| 2079 | SSH_SIG(ILL); |
| 2080 | SSH_SIG(INT); |
| 2081 | SSH_SIG(KILL); |
| 2082 | SSH_SIG(PIPE); |
| 2083 | SSH_SIG(QUIT); |
| 2084 | SSH_SIG(SEGV); |
| 2085 | SSH_SIG(TERM); |
| 2086 | SSH_SIG(USR1); |
| 2087 | SSH_SIG(USR2); |
| 2088 | #undef SSH_SIG |
| 2089 | return "SIG@openssh.com"; |
| 2090 | } |
| 2091 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2092 | static void |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2093 | session_close_x11(int id) |
| 2094 | { |
| 2095 | Channel *c; |
| 2096 | |
Damien Miller | d47c62a | 2005-12-13 19:33:57 +1100 | [diff] [blame] | 2097 | if ((c = channel_by_id(id)) == NULL) { |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2098 | debug("session_close_x11: x11 channel %d missing", id); |
| 2099 | } else { |
| 2100 | /* Detach X11 listener */ |
| 2101 | debug("session_close_x11: detach x11 channel %d", id); |
| 2102 | channel_cancel_cleanup(id); |
| 2103 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
| 2104 | chan_mark_dead(c); |
| 2105 | } |
| 2106 | } |
| 2107 | |
| 2108 | static void |
| 2109 | session_close_single_x11(int id, void *arg) |
| 2110 | { |
| 2111 | Session *s; |
| 2112 | u_int i; |
| 2113 | |
| 2114 | debug3("session_close_single_x11: channel %d", id); |
| 2115 | channel_cancel_cleanup(id); |
| 2116 | if ((s = session_by_x11_channel(id)) == NULL) |
| 2117 | fatal("session_close_single_x11: no x11 channel %d", id); |
| 2118 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
| 2119 | debug("session_close_single_x11: session %d: " |
| 2120 | "closing channel %d", s->self, s->x11_chanids[i]); |
| 2121 | /* |
| 2122 | * The channel "id" is already closing, but make sure we |
| 2123 | * close all of its siblings. |
| 2124 | */ |
| 2125 | if (s->x11_chanids[i] != id) |
| 2126 | session_close_x11(s->x11_chanids[i]); |
| 2127 | } |
| 2128 | xfree(s->x11_chanids); |
| 2129 | s->x11_chanids = NULL; |
| 2130 | if (s->display) { |
| 2131 | xfree(s->display); |
| 2132 | s->display = NULL; |
| 2133 | } |
| 2134 | if (s->auth_proto) { |
| 2135 | xfree(s->auth_proto); |
| 2136 | s->auth_proto = NULL; |
| 2137 | } |
| 2138 | if (s->auth_data) { |
| 2139 | xfree(s->auth_data); |
| 2140 | s->auth_data = NULL; |
| 2141 | } |
| 2142 | if (s->auth_display) { |
| 2143 | xfree(s->auth_display); |
| 2144 | s->auth_display = NULL; |
| 2145 | } |
| 2146 | } |
| 2147 | |
| 2148 | static void |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2149 | session_exit_message(Session *s, int status) |
| 2150 | { |
| 2151 | Channel *c; |
Damien Miller | f3dcf1f | 2002-02-08 22:06:48 +1100 | [diff] [blame] | 2152 | |
| 2153 | if ((c = channel_lookup(s->chanid)) == NULL) |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 2154 | fatal("session_exit_message: session %d: no channel %d", |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2155 | s->self, s->chanid); |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 2156 | debug("session_exit_message: session %d channel %d pid %ld", |
| 2157 | s->self, s->chanid, (long)s->pid); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2158 | |
| 2159 | if (WIFEXITED(status)) { |
Damien Miller | f3dcf1f | 2002-02-08 22:06:48 +1100 | [diff] [blame] | 2160 | channel_request_start(s->chanid, "exit-status", 0); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2161 | packet_put_int(WEXITSTATUS(status)); |
| 2162 | packet_send(); |
| 2163 | } else if (WIFSIGNALED(status)) { |
Damien Miller | f3dcf1f | 2002-02-08 22:06:48 +1100 | [diff] [blame] | 2164 | channel_request_start(s->chanid, "exit-signal", 0); |
Damien Miller | 5a80bba | 2002-09-04 16:39:02 +1000 | [diff] [blame] | 2165 | packet_put_cstring(sig2name(WTERMSIG(status))); |
Damien Miller | f3c6cf1 | 2000-05-17 22:08:29 +1000 | [diff] [blame] | 2166 | #ifdef WCOREDUMP |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2167 | packet_put_char(WCOREDUMP(status)); |
Damien Miller | f3c6cf1 | 2000-05-17 22:08:29 +1000 | [diff] [blame] | 2168 | #else /* WCOREDUMP */ |
| 2169 | packet_put_char(0); |
| 2170 | #endif /* WCOREDUMP */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2171 | packet_put_cstring(""); |
| 2172 | packet_put_cstring(""); |
| 2173 | packet_send(); |
| 2174 | } else { |
| 2175 | /* Some weird exit cause. Just exit. */ |
| 2176 | packet_disconnect("wait returned status %04x.", status); |
| 2177 | } |
| 2178 | |
| 2179 | /* disconnect channel */ |
| 2180 | debug("session_exit_message: release channel %d", s->chanid); |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 2181 | |
| 2182 | /* |
| 2183 | * Adjust cleanup callback attachment to send close messages when |
| 2184 | * the channel gets EOF. The session will be then be closed |
| 2185 | * by session_close_by_channel when the childs close their fds. |
| 2186 | */ |
| 2187 | channel_register_cleanup(c->self, session_close_by_channel, 1); |
| 2188 | |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 2189 | /* |
| 2190 | * emulate a write failure with 'chan_write_failed', nobody will be |
| 2191 | * interested in data we write. |
| 2192 | * Note that we must not call 'chan_read_failed', since there could |
| 2193 | * be some more data waiting in the pipe. |
| 2194 | */ |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 2195 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
| 2196 | chan_write_failed(c); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2197 | } |
| 2198 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2199 | void |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 2200 | session_close(Session *s) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2201 | { |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 2202 | u_int i; |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 2203 | |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 2204 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2205 | if (s->ttyfd != -1) |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 2206 | session_pty_cleanup(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2207 | if (s->term) |
| 2208 | xfree(s->term); |
| 2209 | if (s->display) |
| 2210 | xfree(s->display); |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2211 | if (s->x11_chanids) |
| 2212 | xfree(s->x11_chanids); |
Damien Miller | 512bccb | 2002-02-05 12:11:02 +1100 | [diff] [blame] | 2213 | if (s->auth_display) |
| 2214 | xfree(s->auth_display); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2215 | if (s->auth_data) |
| 2216 | xfree(s->auth_data); |
| 2217 | if (s->auth_proto) |
| 2218 | xfree(s->auth_proto); |
| 2219 | s->used = 0; |
Darren Tucker | 46bc075 | 2004-05-02 22:11:30 +1000 | [diff] [blame] | 2220 | for (i = 0; i < s->num_env; i++) { |
| 2221 | xfree(s->env[i].name); |
| 2222 | xfree(s->env[i].val); |
| 2223 | } |
| 2224 | if (s->env != NULL) |
| 2225 | xfree(s->env); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2226 | session_proctitle(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2227 | } |
| 2228 | |
| 2229 | void |
| 2230 | session_close_by_pid(pid_t pid, int status) |
| 2231 | { |
| 2232 | Session *s = session_by_pid(pid); |
| 2233 | if (s == NULL) { |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 2234 | debug("session_close_by_pid: no session for pid %ld", |
| 2235 | (long)pid); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2236 | return; |
| 2237 | } |
| 2238 | if (s->chanid != -1) |
| 2239 | session_exit_message(s, status); |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 2240 | if (s->ttyfd != -1) |
| 2241 | session_pty_cleanup(s); |
Tim Rice | 83d2f5f | 2006-02-07 15:17:44 -0800 | [diff] [blame] | 2242 | s->pid = 0; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2243 | } |
| 2244 | |
| 2245 | /* |
| 2246 | * this is called when a channel dies before |
| 2247 | * the session 'child' itself dies |
| 2248 | */ |
| 2249 | void |
| 2250 | session_close_by_channel(int id, void *arg) |
| 2251 | { |
| 2252 | Session *s = session_by_channel(id); |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 2253 | u_int i; |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2254 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2255 | if (s == NULL) { |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2256 | debug("session_close_by_channel: no session for id %d", id); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2257 | return; |
| 2258 | } |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 2259 | debug("session_close_by_channel: channel %d child %ld", |
| 2260 | id, (long)s->pid); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2261 | if (s->pid != 0) { |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2262 | debug("session_close_by_channel: channel %d: has child", id); |
Damien Miller | 0585d51 | 2001-10-12 11:35:50 +1000 | [diff] [blame] | 2263 | /* |
| 2264 | * delay detach of session, but release pty, since |
| 2265 | * the fd's to the child are already closed |
| 2266 | */ |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2267 | if (s->ttyfd != -1) |
Damien Miller | 0585d51 | 2001-10-12 11:35:50 +1000 | [diff] [blame] | 2268 | session_pty_cleanup(s); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 2269 | return; |
| 2270 | } |
| 2271 | /* detach by removing callback */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2272 | channel_cancel_cleanup(s->chanid); |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 2273 | |
| 2274 | /* Close any X11 listeners associated with this session */ |
| 2275 | if (s->x11_chanids != NULL) { |
| 2276 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
| 2277 | session_close_x11(s->x11_chanids[i]); |
| 2278 | s->x11_chanids[i] = -1; |
| 2279 | } |
| 2280 | } |
| 2281 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2282 | s->chanid = -1; |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 2283 | session_close(s); |
| 2284 | } |
| 2285 | |
| 2286 | void |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2287 | session_destroy_all(void (*closefunc)(Session *)) |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 2288 | { |
| 2289 | int i; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 2290 | for (i = 0; i < MAX_SESSIONS; i++) { |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 2291 | Session *s = &sessions[i]; |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2292 | if (s->used) { |
| 2293 | if (closefunc != NULL) |
| 2294 | closefunc(s); |
| 2295 | else |
| 2296 | session_close(s); |
| 2297 | } |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 2298 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2299 | } |
| 2300 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2301 | static char * |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2302 | session_tty_list(void) |
| 2303 | { |
| 2304 | static char buf[1024]; |
| 2305 | int i; |
Damien Miller | a8ed44b | 2003-01-10 09:53:12 +1100 | [diff] [blame] | 2306 | char *cp; |
| 2307 | |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2308 | buf[0] = '\0'; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 2309 | for (i = 0; i < MAX_SESSIONS; i++) { |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2310 | Session *s = &sessions[i]; |
| 2311 | if (s->used && s->ttyfd != -1) { |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 2312 | |
Damien Miller | a8ed44b | 2003-01-10 09:53:12 +1100 | [diff] [blame] | 2313 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
| 2314 | cp = strrchr(s->tty, '/'); |
| 2315 | cp = (cp == NULL) ? s->tty : cp + 1; |
| 2316 | } else |
| 2317 | cp = s->tty + 5; |
Damien Miller | 787b2ec | 2003-11-21 23:56:47 +1100 | [diff] [blame] | 2318 | |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2319 | if (buf[0] != '\0') |
| 2320 | strlcat(buf, ",", sizeof buf); |
Damien Miller | a8ed44b | 2003-01-10 09:53:12 +1100 | [diff] [blame] | 2321 | strlcat(buf, cp, sizeof buf); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2322 | } |
| 2323 | } |
| 2324 | if (buf[0] == '\0') |
| 2325 | strlcpy(buf, "notty", sizeof buf); |
| 2326 | return buf; |
| 2327 | } |
| 2328 | |
| 2329 | void |
| 2330 | session_proctitle(Session *s) |
| 2331 | { |
| 2332 | if (s->pw == NULL) |
| 2333 | error("no user for session %d", s->self); |
| 2334 | else |
| 2335 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); |
| 2336 | } |
| 2337 | |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2338 | int |
| 2339 | session_setup_x11fwd(Session *s) |
| 2340 | { |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2341 | struct stat st; |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2342 | char display[512], auth_display[512]; |
| 2343 | char hostname[MAXHOSTNAMELEN]; |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2344 | u_int i; |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2345 | |
| 2346 | if (no_x11_forwarding_flag) { |
| 2347 | packet_send_debug("X11 forwarding disabled in user configuration file."); |
| 2348 | return 0; |
| 2349 | } |
| 2350 | if (!options.x11_forwarding) { |
| 2351 | debug("X11 forwarding disabled in server configuration file."); |
| 2352 | return 0; |
| 2353 | } |
| 2354 | if (!options.xauth_location || |
| 2355 | (stat(options.xauth_location, &st) == -1)) { |
| 2356 | packet_send_debug("No xauth program; cannot forward with spoofing."); |
| 2357 | return 0; |
| 2358 | } |
Ben Lindstrom | 699776e | 2001-06-21 03:14:49 +0000 | [diff] [blame] | 2359 | if (options.use_login) { |
| 2360 | packet_send_debug("X11 forwarding disabled; " |
| 2361 | "not compatible with UseLogin=yes."); |
| 2362 | return 0; |
| 2363 | } |
Ben Lindstrom | 2bcdf06 | 2001-06-13 04:41:41 +0000 | [diff] [blame] | 2364 | if (s->display != NULL) { |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2365 | debug("X11 display already set."); |
| 2366 | return 0; |
| 2367 | } |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2368 | if (x11_create_display_inet(options.x11_display_offset, |
| 2369 | options.x11_use_localhost, s->single_connection, |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2370 | &s->display_number, &s->x11_chanids) == -1) { |
Ben Lindstrom | 2bcdf06 | 2001-06-13 04:41:41 +0000 | [diff] [blame] | 2371 | debug("x11_create_display_inet failed."); |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2372 | return 0; |
| 2373 | } |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2374 | for (i = 0; s->x11_chanids[i] != -1; i++) { |
| 2375 | channel_register_cleanup(s->x11_chanids[i], |
Damien Miller | 39eda6e | 2005-11-05 14:52:50 +1100 | [diff] [blame] | 2376 | session_close_single_x11, 0); |
Damien Miller | 2b9b045 | 2005-07-17 17:19:24 +1000 | [diff] [blame] | 2377 | } |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2378 | |
| 2379 | /* Set up a suitable value for the DISPLAY variable. */ |
| 2380 | if (gethostname(hostname, sizeof(hostname)) < 0) |
| 2381 | fatal("gethostname: %.100s", strerror(errno)); |
| 2382 | /* |
| 2383 | * auth_display must be used as the displayname when the |
| 2384 | * authorization entry is added with xauth(1). This will be |
| 2385 | * different than the DISPLAY string for localhost displays. |
| 2386 | */ |
Damien Miller | 95c249f | 2002-02-05 12:11:34 +1100 | [diff] [blame] | 2387 | if (options.x11_use_localhost) { |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2388 | snprintf(display, sizeof display, "localhost:%u.%u", |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2389 | s->display_number, s->screen); |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2390 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
Damien Miller | 512bccb | 2002-02-05 12:11:02 +1100 | [diff] [blame] | 2391 | s->display_number, s->screen); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2392 | s->display = xstrdup(display); |
Damien Miller | 512bccb | 2002-02-05 12:11:02 +1100 | [diff] [blame] | 2393 | s->auth_display = xstrdup(auth_display); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2394 | } else { |
| 2395 | #ifdef IPADDR_IN_DISPLAY |
| 2396 | struct hostent *he; |
| 2397 | struct in_addr my_addr; |
| 2398 | |
| 2399 | he = gethostbyname(hostname); |
| 2400 | if (he == NULL) { |
| 2401 | error("Can't get IP address for X11 DISPLAY."); |
| 2402 | packet_send_debug("Can't get IP address for X11 DISPLAY."); |
| 2403 | return 0; |
| 2404 | } |
| 2405 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2406 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2407 | s->display_number, s->screen); |
| 2408 | #else |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2409 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2410 | s->display_number, s->screen); |
| 2411 | #endif |
| 2412 | s->display = xstrdup(display); |
Damien Miller | 512bccb | 2002-02-05 12:11:02 +1100 | [diff] [blame] | 2413 | s->auth_display = xstrdup(display); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2414 | } |
| 2415 | |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2416 | return 1; |
| 2417 | } |
| 2418 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2419 | static void |
Ben Lindstrom | db65e8f | 2001-01-19 04:26:52 +0000 | [diff] [blame] | 2420 | do_authenticated2(Authctxt *authctxt) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2421 | { |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 2422 | server_loop2(authctxt); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2423 | } |
| 2424 | |
| 2425 | void |
| 2426 | do_cleanup(Authctxt *authctxt) |
| 2427 | { |
| 2428 | static int called = 0; |
| 2429 | |
| 2430 | debug("do_cleanup"); |
| 2431 | |
| 2432 | /* no cleanup if we're in the child for login shell */ |
| 2433 | if (is_child) |
| 2434 | return; |
| 2435 | |
| 2436 | /* avoid double cleanup */ |
| 2437 | if (called) |
| 2438 | return; |
| 2439 | called = 1; |
| 2440 | |
| 2441 | if (authctxt == NULL) |
| 2442 | return; |
| 2443 | #ifdef KRB5 |
| 2444 | if (options.kerberos_ticket_cleanup && |
| 2445 | authctxt->krb5_ctx) |
| 2446 | krb5_cleanup_proc(authctxt); |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 2447 | #endif |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2448 | |
| 2449 | #ifdef GSSAPI |
| 2450 | if (compat20 && options.gss_cleanup_creds) |
| 2451 | ssh_gssapi_cleanup_creds(); |
| 2452 | #endif |
| 2453 | |
Darren Tucker | 8846a07 | 2003-10-07 11:30:15 +1000 | [diff] [blame] | 2454 | #ifdef USE_PAM |
| 2455 | if (options.use_pam) { |
| 2456 | sshpam_cleanup(); |
| 2457 | sshpam_thread_cleanup(); |
| 2458 | } |
| 2459 | #endif |
| 2460 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2461 | /* remove agent socket */ |
| 2462 | auth_sock_cleanup_proc(authctxt->pw); |
| 2463 | |
| 2464 | /* |
| 2465 | * Cleanup ptys/utmp only if privsep is disabled, |
| 2466 | * or if running in monitor. |
| 2467 | */ |
| 2468 | if (!use_privsep || mm_is_monitor()) |
| 2469 | session_destroy_all(session_pty_cleanup2); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2470 | } |