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" |
Darren Tucker | 072a7b1 | 2003-10-15 16:10:25 +1000 | [diff] [blame] | 36 | RCSID("$OpenBSD: session.c,v 1.166 2003/10/14 19:54:39 markus Exp $"); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 37 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 38 | #include "ssh.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 39 | #include "ssh1.h" |
| 40 | #include "ssh2.h" |
| 41 | #include "xmalloc.h" |
Ben Lindstrom | d95c09c | 2001-02-18 19:13:33 +0000 | [diff] [blame] | 42 | #include "sshpty.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 43 | #include "packet.h" |
| 44 | #include "buffer.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 45 | #include "mpaux.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 46 | #include "uidswap.h" |
| 47 | #include "compat.h" |
Ben Lindstrom | c763767 | 2001-06-09 00:36:26 +0000 | [diff] [blame] | 48 | #include "channels.h" |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 49 | #include "bufaux.h" |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 50 | #include "auth.h" |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 51 | #include "auth-options.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 52 | #include "pathnames.h" |
| 53 | #include "log.h" |
| 54 | #include "servconf.h" |
Ben Lindstrom | d95c09c | 2001-02-18 19:13:33 +0000 | [diff] [blame] | 55 | #include "sshlogin.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 56 | #include "serverloop.h" |
| 57 | #include "canohost.h" |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 58 | #include "session.h" |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 59 | #include "monitor_wrap.h" |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 60 | |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 61 | #ifdef GSSAPI |
| 62 | #include "ssh-gss.h" |
| 63 | #endif |
| 64 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 65 | /* func */ |
| 66 | |
| 67 | Session *session_new(void); |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 68 | void session_set_fds(Session *, int, int, int); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 69 | void session_pty_cleanup(Session *); |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 70 | void session_proctitle(Session *); |
| 71 | int session_setup_x11fwd(Session *); |
| 72 | void do_exec_pty(Session *, const char *); |
| 73 | void do_exec_no_pty(Session *, const char *); |
| 74 | void do_exec(Session *, const char *); |
| 75 | void do_login(Session *, const char *); |
Kevin Steves | a0957d6 | 2001-09-27 19:50:26 +0000 | [diff] [blame] | 76 | #ifdef LOGIN_NEEDS_UTMPX |
| 77 | static void do_pre_login(Session *s); |
| 78 | #endif |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 79 | void do_child(Session *, const char *); |
Damien Miller | cf205e8 | 2001-04-16 18:29:15 +1000 | [diff] [blame] | 80 | void do_motd(void); |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 81 | int check_quietlogin(Session *, const char *); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 82 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 83 | static void do_authenticated1(Authctxt *); |
| 84 | static void do_authenticated2(Authctxt *); |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 85 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 86 | static int session_pty_req(Session *); |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 87 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 88 | /* import */ |
| 89 | extern ServerOptions options; |
| 90 | extern char *__progname; |
| 91 | extern int log_stderr; |
| 92 | extern int debug_flag; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 93 | extern u_int utmp_len; |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 94 | extern int startup_pipe; |
Ben Lindstrom | 005dd22 | 2001-04-18 15:29:33 +0000 | [diff] [blame] | 95 | extern void destroy_sensitive_data(void); |
Darren Tucker | b9aa0a0 | 2003-07-08 22:59:59 +1000 | [diff] [blame] | 96 | extern Buffer loginmsg; |
Damien Miller | 3702396 | 2000-07-11 17:31:38 +1000 | [diff] [blame] | 97 | |
Damien Miller | 7b28dc5 | 2000-09-05 13:34:53 +1100 | [diff] [blame] | 98 | /* original command from peer. */ |
Ben Lindstrom | 0a7ca6c | 2001-06-21 03:17:42 +0000 | [diff] [blame] | 99 | const char *original_command = NULL; |
Damien Miller | 7b28dc5 | 2000-09-05 13:34:53 +1100 | [diff] [blame] | 100 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 101 | /* data */ |
| 102 | #define MAX_SESSIONS 10 |
| 103 | Session sessions[MAX_SESSIONS]; |
Damien Miller | 15e7d4b | 2000-09-29 10:57:35 +1100 | [diff] [blame] | 104 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 105 | #ifdef HAVE_LOGIN_CAP |
Ben Lindstrom | b481e13 | 2002-03-22 01:35:47 +0000 | [diff] [blame] | 106 | login_cap_t *lc; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 107 | #endif |
| 108 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 109 | static int is_child = 0; |
| 110 | |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 111 | /* Name and directory of socket for authentication agent forwarding. */ |
| 112 | static char *auth_sock_name = NULL; |
| 113 | static char *auth_sock_dir = NULL; |
| 114 | |
| 115 | /* removes the agent forwarding socket */ |
| 116 | |
| 117 | static void |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 118 | auth_sock_cleanup_proc(struct passwd *pw) |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 119 | { |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 120 | if (auth_sock_name != NULL) { |
| 121 | temporarily_use_uid(pw); |
| 122 | unlink(auth_sock_name); |
| 123 | rmdir(auth_sock_dir); |
| 124 | auth_sock_name = NULL; |
| 125 | restore_uid(); |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | static int |
| 130 | auth_input_request_forwarding(struct passwd * pw) |
| 131 | { |
| 132 | Channel *nc; |
| 133 | int sock; |
| 134 | struct sockaddr_un sunaddr; |
| 135 | |
| 136 | if (auth_sock_name != NULL) { |
| 137 | error("authentication forwarding requested twice."); |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | /* Temporarily drop privileged uid for mkdir/bind. */ |
| 142 | temporarily_use_uid(pw); |
| 143 | |
| 144 | /* Allocate a buffer for the socket name, and format the name. */ |
| 145 | auth_sock_name = xmalloc(MAXPATHLEN); |
| 146 | auth_sock_dir = xmalloc(MAXPATHLEN); |
Darren Tucker | 072a7b1 | 2003-10-15 16:10:25 +1000 | [diff] [blame] | 147 | strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN); |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 148 | |
| 149 | /* Create private directory for socket */ |
| 150 | if (mkdtemp(auth_sock_dir) == NULL) { |
| 151 | packet_send_debug("Agent forwarding disabled: " |
| 152 | "mkdtemp() failed: %.100s", strerror(errno)); |
| 153 | restore_uid(); |
| 154 | xfree(auth_sock_name); |
| 155 | xfree(auth_sock_dir); |
| 156 | auth_sock_name = NULL; |
| 157 | auth_sock_dir = NULL; |
| 158 | return 0; |
| 159 | } |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 160 | snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%ld", |
| 161 | auth_sock_dir, (long) getpid()); |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 162 | |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 163 | /* Create the socket. */ |
| 164 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
| 165 | if (sock < 0) |
| 166 | packet_disconnect("socket: %.100s", strerror(errno)); |
| 167 | |
| 168 | /* Bind it to the name. */ |
| 169 | memset(&sunaddr, 0, sizeof(sunaddr)); |
| 170 | sunaddr.sun_family = AF_UNIX; |
| 171 | strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path)); |
| 172 | |
| 173 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) |
| 174 | packet_disconnect("bind: %.100s", strerror(errno)); |
| 175 | |
| 176 | /* Restore the privileged uid. */ |
| 177 | restore_uid(); |
| 178 | |
| 179 | /* Start listening on the socket. */ |
| 180 | if (listen(sock, 5) < 0) |
| 181 | packet_disconnect("listen: %.100s", strerror(errno)); |
| 182 | |
| 183 | /* Allocate a channel for the authentication agent socket. */ |
| 184 | nc = channel_new("auth socket", |
| 185 | SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1, |
| 186 | CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT, |
Damien Miller | b1ca8bb | 2003-05-14 13:45:42 +1000 | [diff] [blame] | 187 | 0, "auth socket", 1); |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 188 | strlcpy(nc->path, auth_sock_name, sizeof(nc->path)); |
| 189 | return 1; |
| 190 | } |
| 191 | |
| 192 | |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 193 | void |
| 194 | do_authenticated(Authctxt *authctxt) |
| 195 | { |
Damien Miller | 97f39ae | 2003-02-24 11:57:01 +1100 | [diff] [blame] | 196 | setproctitle("%s", authctxt->pw->pw_name); |
| 197 | |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 198 | /* |
| 199 | * Cancel the alarm we set to limit the time taken for |
| 200 | * authentication. |
| 201 | */ |
| 202 | alarm(0); |
| 203 | if (startup_pipe != -1) { |
| 204 | close(startup_pipe); |
| 205 | startup_pipe = -1; |
| 206 | } |
Damien Miller | e49d096 | 2001-11-13 23:46:18 +1100 | [diff] [blame] | 207 | |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 208 | /* setup the channel layer */ |
| 209 | if (!no_port_forwarding_flag && options.allow_tcp_forwarding) |
| 210 | channel_permit_all_opens(); |
| 211 | |
| 212 | if (compat20) |
| 213 | do_authenticated2(authctxt); |
| 214 | else |
| 215 | do_authenticated1(authctxt); |
Ben Lindstrom | 838394c | 2001-06-09 01:11:59 +0000 | [diff] [blame] | 216 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 217 | do_cleanup(authctxt); |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 218 | } |
| 219 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 220 | /* |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 221 | * Prepares for an interactive session. This is called after the user has |
| 222 | * been successfully authenticated. During this message exchange, pseudo |
| 223 | * terminals are allocated, X11, TCP/IP, and authentication agent forwardings |
| 224 | * are requested, etc. |
| 225 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 226 | static void |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 227 | do_authenticated1(Authctxt *authctxt) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 228 | { |
| 229 | Session *s; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 230 | char *command; |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 231 | int success, type, screen_flag; |
Ben Lindstrom | e23f4a3 | 2002-06-23 21:40:16 +0000 | [diff] [blame] | 232 | int enable_compression_after_reply = 0; |
| 233 | u_int proto_len, data_len, dlen, compression_level = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 234 | |
| 235 | s = session_new(); |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 236 | s->authctxt = authctxt; |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 237 | s->pw = authctxt->pw; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 238 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 239 | /* |
| 240 | * We stay in this loop until the client requests to execute a shell |
| 241 | * or a command. |
| 242 | */ |
| 243 | for (;;) { |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 244 | success = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 245 | |
| 246 | /* Get a packet from the client. */ |
Damien Miller | dff5099 | 2002-01-22 23:16:32 +1100 | [diff] [blame] | 247 | type = packet_read(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 248 | |
| 249 | /* Process the packet. */ |
| 250 | switch (type) { |
| 251 | case SSH_CMSG_REQUEST_COMPRESSION: |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 252 | compression_level = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 253 | packet_check_eom(); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 254 | if (compression_level < 1 || compression_level > 9) { |
| 255 | packet_send_debug("Received illegal compression level %d.", |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 256 | compression_level); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 257 | break; |
| 258 | } |
Ben Lindstrom | 23e0f66 | 2002-06-21 01:09:47 +0000 | [diff] [blame] | 259 | if (!options.compression) { |
| 260 | debug2("compression disabled"); |
| 261 | break; |
| 262 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 263 | /* Enable compression after we have responded with SUCCESS. */ |
| 264 | enable_compression_after_reply = 1; |
| 265 | success = 1; |
| 266 | break; |
| 267 | |
| 268 | case SSH_CMSG_REQUEST_PTY: |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 269 | success = session_pty_req(s); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 270 | break; |
| 271 | |
| 272 | case SSH_CMSG_X11_REQUEST_FORWARDING: |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 273 | s->auth_proto = packet_get_string(&proto_len); |
| 274 | s->auth_data = packet_get_string(&data_len); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 275 | |
Ben Lindstrom | 7603b2d | 2001-02-26 20:13:32 +0000 | [diff] [blame] | 276 | screen_flag = packet_get_protocol_flags() & |
| 277 | SSH_PROTOFLAG_SCREEN_NUMBER; |
| 278 | debug2("SSH_PROTOFLAG_SCREEN_NUMBER: %d", screen_flag); |
| 279 | |
| 280 | if (packet_remaining() == 4) { |
| 281 | if (!screen_flag) |
| 282 | debug2("Buggy client: " |
| 283 | "X11 screen flag missing"); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 284 | s->screen = packet_get_int(); |
Ben Lindstrom | 8dcdeb8 | 2001-02-16 16:02:14 +0000 | [diff] [blame] | 285 | } else { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 286 | s->screen = 0; |
Ben Lindstrom | 8dcdeb8 | 2001-02-16 16:02:14 +0000 | [diff] [blame] | 287 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 288 | packet_check_eom(); |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 289 | success = session_setup_x11fwd(s); |
| 290 | if (!success) { |
| 291 | xfree(s->auth_proto); |
| 292 | xfree(s->auth_data); |
Ben Lindstrom | 88259fb | 2001-06-12 00:21:34 +0000 | [diff] [blame] | 293 | s->auth_proto = NULL; |
| 294 | s->auth_data = NULL; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 295 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 296 | break; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 297 | |
| 298 | case SSH_CMSG_AGENT_REQUEST_FORWARDING: |
| 299 | if (no_agent_forwarding_flag || compat13) { |
| 300 | debug("Authentication agent forwarding not permitted for this authentication."); |
| 301 | break; |
| 302 | } |
| 303 | debug("Received authentication agent forwarding request."); |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 304 | success = auth_input_request_forwarding(s->pw); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 305 | break; |
| 306 | |
| 307 | case SSH_CMSG_PORT_FORWARD_REQUEST: |
| 308 | if (no_port_forwarding_flag) { |
| 309 | debug("Port forwarding not permitted for this authentication."); |
| 310 | break; |
| 311 | } |
Damien Miller | 50a41ed | 2000-10-16 12:14:42 +1100 | [diff] [blame] | 312 | if (!options.allow_tcp_forwarding) { |
| 313 | debug("Port forwarding not permitted."); |
| 314 | break; |
| 315 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 316 | debug("Received TCP/IP port forwarding request."); |
Ben Lindstrom | b31783d | 2001-03-22 02:02:12 +0000 | [diff] [blame] | 317 | 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] | 318 | success = 1; |
| 319 | break; |
| 320 | |
| 321 | case SSH_CMSG_MAX_PACKET_SIZE: |
| 322 | if (packet_set_maxsize(packet_get_int()) > 0) |
| 323 | success = 1; |
| 324 | break; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 325 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 326 | case SSH_CMSG_EXEC_SHELL: |
| 327 | case SSH_CMSG_EXEC_CMD: |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 328 | if (type == SSH_CMSG_EXEC_CMD) { |
| 329 | command = packet_get_string(&dlen); |
| 330 | debug("Exec command '%.500s'", command); |
Ben Lindstrom | 0a7ca6c | 2001-06-21 03:17:42 +0000 | [diff] [blame] | 331 | do_exec(s, command); |
| 332 | xfree(command); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 333 | } else { |
Ben Lindstrom | 0a7ca6c | 2001-06-21 03:17:42 +0000 | [diff] [blame] | 334 | do_exec(s, NULL); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 335 | } |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 336 | packet_check_eom(); |
Ben Lindstrom | cb3929d | 2001-06-09 01:34:15 +0000 | [diff] [blame] | 337 | session_close(s); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 338 | return; |
| 339 | |
| 340 | default: |
| 341 | /* |
| 342 | * Any unknown messages in this phase are ignored, |
| 343 | * and a failure message is returned. |
| 344 | */ |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 345 | logit("Unknown packet type received after authentication: %d", type); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 346 | } |
| 347 | packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE); |
| 348 | packet_send(); |
| 349 | packet_write_wait(); |
| 350 | |
| 351 | /* Enable compression now that we have replied if appropriate. */ |
| 352 | if (enable_compression_after_reply) { |
| 353 | enable_compression_after_reply = 0; |
| 354 | packet_start_compression(compression_level); |
| 355 | } |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | /* |
| 360 | * This is called to fork and execute a command when we have no tty. This |
| 361 | * will call do_child from the child, and server_loop from the parent after |
| 362 | * setting up file descriptors and such. |
| 363 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 364 | void |
Ben Lindstrom | b4c961d | 2001-03-22 01:25:37 +0000 | [diff] [blame] | 365 | do_exec_no_pty(Session *s, const char *command) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 366 | { |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 367 | pid_t pid; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 368 | |
| 369 | #ifdef USE_PIPES |
| 370 | int pin[2], pout[2], perr[2]; |
| 371 | /* Allocate pipes for communicating with the program. */ |
| 372 | if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0) |
| 373 | packet_disconnect("Could not create pipes: %.100s", |
| 374 | strerror(errno)); |
| 375 | #else /* USE_PIPES */ |
| 376 | int inout[2], err[2]; |
| 377 | /* Uses socket pairs to communicate with the program. */ |
| 378 | if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 || |
| 379 | socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) |
| 380 | packet_disconnect("Could not create socket pairs: %.100s", |
| 381 | strerror(errno)); |
| 382 | #endif /* USE_PIPES */ |
| 383 | if (s == NULL) |
| 384 | fatal("do_exec_no_pty: no session"); |
| 385 | |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 386 | session_proctitle(s); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 387 | |
Damien Miller | c594633 | 2001-02-28 11:46:11 +1100 | [diff] [blame] | 388 | #if defined(USE_PAM) |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 389 | if (options.use_pam) { |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 390 | do_pam_setcred(1); |
| 391 | if (is_pam_password_change_required()) |
| 392 | packet_disconnect("Password change required but no " |
| 393 | "TTY available"); |
| 394 | } |
Kevin Steves | ff793a2 | 2001-02-21 16:36:51 +0000 | [diff] [blame] | 395 | #endif /* USE_PAM */ |
| 396 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 397 | /* Fork the child. */ |
| 398 | if ((pid = fork()) == 0) { |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 399 | is_child = 1; |
Ben Lindstrom | 264ee30 | 2002-07-23 21:01:56 +0000 | [diff] [blame] | 400 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 401 | /* Child. Reinitialize the log since the pid has changed. */ |
| 402 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
| 403 | |
| 404 | /* |
| 405 | * Create a new session and process group since the 4.4BSD |
| 406 | * setlogin() affects the entire process group. |
| 407 | */ |
| 408 | if (setsid() < 0) |
| 409 | error("setsid failed: %.100s", strerror(errno)); |
| 410 | |
| 411 | #ifdef USE_PIPES |
| 412 | /* |
| 413 | * Redirect stdin. We close the parent side of the socket |
| 414 | * pair, and make the child side the standard input. |
| 415 | */ |
| 416 | close(pin[1]); |
| 417 | if (dup2(pin[0], 0) < 0) |
| 418 | perror("dup2 stdin"); |
| 419 | close(pin[0]); |
| 420 | |
| 421 | /* Redirect stdout. */ |
| 422 | close(pout[0]); |
| 423 | if (dup2(pout[1], 1) < 0) |
| 424 | perror("dup2 stdout"); |
| 425 | close(pout[1]); |
| 426 | |
| 427 | /* Redirect stderr. */ |
| 428 | close(perr[0]); |
| 429 | if (dup2(perr[1], 2) < 0) |
| 430 | perror("dup2 stderr"); |
| 431 | close(perr[1]); |
| 432 | #else /* USE_PIPES */ |
| 433 | /* |
| 434 | * Redirect stdin, stdout, and stderr. Stdin and stdout will |
| 435 | * use the same socket, as some programs (particularly rdist) |
| 436 | * seem to depend on it. |
| 437 | */ |
| 438 | close(inout[1]); |
| 439 | close(err[1]); |
| 440 | if (dup2(inout[0], 0) < 0) /* stdin */ |
| 441 | perror("dup2 stdin"); |
| 442 | if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */ |
| 443 | perror("dup2 stdout"); |
| 444 | if (dup2(err[0], 2) < 0) /* stderr */ |
| 445 | perror("dup2 stderr"); |
| 446 | #endif /* USE_PIPES */ |
| 447 | |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 448 | #ifdef _UNICOS |
| 449 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ |
| 450 | #endif |
| 451 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 452 | /* Do processing for the child (exec command etc). */ |
Ben Lindstrom | 86fe868 | 2001-03-17 00:32:57 +0000 | [diff] [blame] | 453 | do_child(s, command); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 454 | /* NOTREACHED */ |
| 455 | } |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 456 | #ifdef _UNICOS |
| 457 | signal(WJSIGNAL, cray_job_termination_handler); |
| 458 | #endif /* _UNICOS */ |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 459 | #ifdef HAVE_CYGWIN |
| 460 | if (is_winnt) |
| 461 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); |
| 462 | #endif |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 463 | if (pid < 0) |
| 464 | packet_disconnect("fork failed: %.100s", strerror(errno)); |
| 465 | s->pid = pid; |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 466 | /* Set interactive/non-interactive mode. */ |
| 467 | packet_set_interactive(s->display != NULL); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 468 | #ifdef USE_PIPES |
| 469 | /* We are the parent. Close the child sides of the pipes. */ |
| 470 | close(pin[0]); |
| 471 | close(pout[1]); |
| 472 | close(perr[1]); |
| 473 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 474 | if (compat20) { |
Ben Lindstrom | fc9b07d | 2001-03-22 01:27:23 +0000 | [diff] [blame] | 475 | session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 476 | } else { |
| 477 | /* Enter the interactive session. */ |
| 478 | server_loop(pid, pin[1], pout[0], perr[0]); |
Ben Lindstrom | fc9b07d | 2001-03-22 01:27:23 +0000 | [diff] [blame] | 479 | /* server_loop has closed pin[1], pout[0], and perr[0]. */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 480 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 481 | #else /* USE_PIPES */ |
| 482 | /* We are the parent. Close the child sides of the socket pairs. */ |
| 483 | close(inout[0]); |
| 484 | close(err[0]); |
| 485 | |
| 486 | /* |
| 487 | * Enter the interactive session. Note: server_loop must be able to |
| 488 | * handle the case that fdin and fdout are the same. |
| 489 | */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 490 | if (compat20) { |
Ben Lindstrom | fc9b07d | 2001-03-22 01:27:23 +0000 | [diff] [blame] | 491 | 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] | 492 | } else { |
| 493 | server_loop(pid, inout[1], inout[1], err[1]); |
| 494 | /* server_loop has closed inout[1] and err[1]. */ |
| 495 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 496 | #endif /* USE_PIPES */ |
| 497 | } |
| 498 | |
| 499 | /* |
| 500 | * This is called to fork and execute a command when we have a tty. This |
| 501 | * will call do_child from the child, and server_loop from the parent after |
| 502 | * setting up file descriptors, controlling tty, updating wtmp, utmp, |
| 503 | * lastlog, and other such operations. |
| 504 | */ |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 505 | void |
Ben Lindstrom | b4c961d | 2001-03-22 01:25:37 +0000 | [diff] [blame] | 506 | do_exec_pty(Session *s, const char *command) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 507 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 508 | int fdout, ptyfd, ttyfd, ptymaster; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 509 | pid_t pid; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 510 | |
| 511 | if (s == NULL) |
| 512 | fatal("do_exec_pty: no session"); |
| 513 | ptyfd = s->ptyfd; |
| 514 | ttyfd = s->ttyfd; |
| 515 | |
Damien Miller | c594633 | 2001-02-28 11:46:11 +1100 | [diff] [blame] | 516 | #if defined(USE_PAM) |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 517 | if (options.use_pam) { |
Damien Miller | 341c6e6 | 2003-09-02 23:18:52 +1000 | [diff] [blame] | 518 | do_pam_set_tty(s->tty); |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 519 | do_pam_setcred(1); |
| 520 | } |
Damien Miller | 5a76131 | 2001-02-27 09:28:23 +1100 | [diff] [blame] | 521 | #endif |
Kevin Steves | ff793a2 | 2001-02-21 16:36:51 +0000 | [diff] [blame] | 522 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 523 | /* Fork the child. */ |
| 524 | if ((pid = fork()) == 0) { |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 525 | is_child = 1; |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 526 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 527 | /* Child. Reinitialize the log because the pid has changed. */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 528 | log_init(__progname, options.log_level, options.log_facility, log_stderr); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 529 | /* Close the master side of the pseudo tty. */ |
| 530 | close(ptyfd); |
| 531 | |
| 532 | /* Make the pseudo tty our controlling tty. */ |
| 533 | pty_make_controlling_tty(&ttyfd, s->tty); |
| 534 | |
Damien Miller | 9c75142 | 2001-10-10 15:02:46 +1000 | [diff] [blame] | 535 | /* Redirect stdin/stdout/stderr from the pseudo tty. */ |
| 536 | if (dup2(ttyfd, 0) < 0) |
| 537 | error("dup2 stdin: %s", strerror(errno)); |
| 538 | if (dup2(ttyfd, 1) < 0) |
| 539 | error("dup2 stdout: %s", strerror(errno)); |
| 540 | if (dup2(ttyfd, 2) < 0) |
| 541 | error("dup2 stderr: %s", strerror(errno)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 542 | |
| 543 | /* Close the extra descriptor for the pseudo tty. */ |
| 544 | close(ttyfd); |
| 545 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 546 | /* record login, etc. similar to login(1) */ |
Damien Miller | 364a9bd | 2001-04-16 18:37:05 +1000 | [diff] [blame] | 547 | #ifndef HAVE_OSF_SIA |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 548 | if (!(options.use_login && command == NULL)) { |
| 549 | #ifdef _UNICOS |
| 550 | cray_init_job(s->pw); /* set up cray jid and tmpdir */ |
| 551 | #endif /* _UNICOS */ |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 552 | do_login(s, command); |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 553 | } |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 554 | # ifdef LOGIN_NEEDS_UTMPX |
| 555 | else |
| 556 | do_pre_login(s); |
| 557 | # endif |
Damien Miller | 364a9bd | 2001-04-16 18:37:05 +1000 | [diff] [blame] | 558 | #endif |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 559 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 560 | /* Do common processing for the child, such as execing the command. */ |
Ben Lindstrom | 86fe868 | 2001-03-17 00:32:57 +0000 | [diff] [blame] | 561 | do_child(s, command); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 562 | /* NOTREACHED */ |
| 563 | } |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 564 | #ifdef _UNICOS |
| 565 | signal(WJSIGNAL, cray_job_termination_handler); |
| 566 | #endif /* _UNICOS */ |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 567 | #ifdef HAVE_CYGWIN |
| 568 | if (is_winnt) |
| 569 | cygwin_set_impersonation_token(INVALID_HANDLE_VALUE); |
| 570 | #endif |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 571 | if (pid < 0) |
| 572 | packet_disconnect("fork failed: %.100s", strerror(errno)); |
| 573 | s->pid = pid; |
| 574 | |
| 575 | /* Parent. Close the slave side of the pseudo tty. */ |
| 576 | close(ttyfd); |
| 577 | |
| 578 | /* |
| 579 | * Create another descriptor of the pty master side for use as the |
| 580 | * standard input. We could use the original descriptor, but this |
| 581 | * simplifies code in server_loop. The descriptor is bidirectional. |
| 582 | */ |
| 583 | fdout = dup(ptyfd); |
| 584 | if (fdout < 0) |
| 585 | packet_disconnect("dup #1 failed: %.100s", strerror(errno)); |
| 586 | |
| 587 | /* we keep a reference to the pty master */ |
| 588 | ptymaster = dup(ptyfd); |
| 589 | if (ptymaster < 0) |
| 590 | packet_disconnect("dup #2 failed: %.100s", strerror(errno)); |
| 591 | s->ptymaster = ptymaster; |
| 592 | |
| 593 | /* Enter interactive session. */ |
Ben Lindstrom | bf555ba | 2001-01-18 02:04:35 +0000 | [diff] [blame] | 594 | packet_set_interactive(1); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 595 | if (compat20) { |
| 596 | session_set_fds(s, ptyfd, fdout, -1); |
| 597 | } else { |
| 598 | server_loop(pid, ptyfd, fdout, -1); |
| 599 | /* server_loop _has_ closed ptyfd and fdout. */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 600 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 601 | } |
| 602 | |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 603 | #ifdef LOGIN_NEEDS_UTMPX |
Damien Miller | 599d8eb | 2001-09-15 12:25:53 +1000 | [diff] [blame] | 604 | static void |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 605 | do_pre_login(Session *s) |
| 606 | { |
| 607 | socklen_t fromlen; |
| 608 | struct sockaddr_storage from; |
| 609 | pid_t pid = getpid(); |
| 610 | |
| 611 | /* |
| 612 | * Get IP address of client. If the connection is not a socket, let |
| 613 | * the address be 0.0.0.0. |
| 614 | */ |
| 615 | memset(&from, 0, sizeof(from)); |
Damien Miller | ebc2306 | 2002-09-04 16:45:09 +1000 | [diff] [blame] | 616 | fromlen = sizeof(from); |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 617 | if (packet_connection_is_on_socket()) { |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 618 | if (getpeername(packet_get_connection_in(), |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 619 | (struct sockaddr *) & from, &fromlen) < 0) { |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 620 | debug("getpeername: %.100s", strerror(errno)); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 621 | cleanup_exit(255); |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 622 | } |
| 623 | } |
| 624 | |
| 625 | record_utmp_only(pid, s->tty, s->pw->pw_name, |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 626 | get_remote_name_or_ip(utmp_len, options.use_dns), |
Kevin Steves | 678ee51 | 2003-01-01 23:43:55 +0000 | [diff] [blame] | 627 | (struct sockaddr *)&from, fromlen); |
Ben Lindstrom | 97c677d | 2001-05-08 20:33:05 +0000 | [diff] [blame] | 628 | } |
| 629 | #endif |
| 630 | |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 631 | /* |
| 632 | * This is called to fork and execute a command. If another command is |
| 633 | * to be forced, execute that instead. |
| 634 | */ |
| 635 | void |
| 636 | do_exec(Session *s, const char *command) |
| 637 | { |
| 638 | if (forced_command) { |
| 639 | original_command = command; |
| 640 | command = forced_command; |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 641 | debug("Forced command '%.900s'", command); |
| 642 | } |
| 643 | |
Damien Miller | 324948b | 2003-09-02 22:55:45 +1000 | [diff] [blame] | 644 | #ifdef GSSAPI |
| 645 | if (options.gss_authentication) { |
| 646 | temporarily_use_uid(s->pw); |
| 647 | ssh_gssapi_storecreds(); |
| 648 | restore_uid(); |
| 649 | } |
| 650 | #endif |
| 651 | |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 652 | if (s->ttyfd != -1) |
| 653 | do_exec_pty(s, command); |
| 654 | else |
| 655 | do_exec_no_pty(s, command); |
| 656 | |
Ben Lindstrom | 0a7ca6c | 2001-06-21 03:17:42 +0000 | [diff] [blame] | 657 | original_command = NULL; |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 658 | } |
| 659 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 660 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 661 | /* administrative, login(1)-like work */ |
| 662 | void |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 663 | do_login(Session *s, const char *command) |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 664 | { |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 665 | char *time_string; |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 666 | socklen_t fromlen; |
| 667 | struct sockaddr_storage from; |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 668 | struct passwd * pw = s->pw; |
| 669 | pid_t pid = getpid(); |
| 670 | |
| 671 | /* |
| 672 | * Get IP address of client. If the connection is not a socket, let |
| 673 | * the address be 0.0.0.0. |
| 674 | */ |
| 675 | memset(&from, 0, sizeof(from)); |
Kevin Steves | 678ee51 | 2003-01-01 23:43:55 +0000 | [diff] [blame] | 676 | fromlen = sizeof(from); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 677 | if (packet_connection_is_on_socket()) { |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 678 | if (getpeername(packet_get_connection_in(), |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 679 | (struct sockaddr *) & from, &fromlen) < 0) { |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 680 | debug("getpeername: %.100s", strerror(errno)); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 681 | cleanup_exit(255); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 682 | } |
| 683 | } |
| 684 | |
| 685 | /* 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] | 686 | if (!use_privsep) |
| 687 | record_login(pid, s->tty, pw->pw_name, pw->pw_uid, |
| 688 | get_remote_name_or_ip(utmp_len, |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 689 | options.use_dns), |
Damien Miller | ebc2306 | 2002-09-04 16:45:09 +1000 | [diff] [blame] | 690 | (struct sockaddr *)&from, fromlen); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 691 | |
Kevin Steves | 092f2ef | 2000-10-14 13:36:13 +0000 | [diff] [blame] | 692 | #ifdef USE_PAM |
| 693 | /* |
| 694 | * If password change is needed, do it now. |
| 695 | * This needs to occur before the ~/.hushlogin check. |
| 696 | */ |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 697 | if (options.use_pam && is_pam_password_change_required()) { |
Kevin Steves | 092f2ef | 2000-10-14 13:36:13 +0000 | [diff] [blame] | 698 | print_pam_messages(); |
| 699 | do_pam_chauthtok(); |
Damien Miller | 1f499fd | 2003-08-25 13:08:49 +1000 | [diff] [blame] | 700 | /* XXX - signal [net] parent to enable forwardings */ |
Kevin Steves | 092f2ef | 2000-10-14 13:36:13 +0000 | [diff] [blame] | 701 | } |
| 702 | #endif |
| 703 | |
Damien Miller | cf205e8 | 2001-04-16 18:29:15 +1000 | [diff] [blame] | 704 | if (check_quietlogin(s, command)) |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 705 | return; |
| 706 | |
| 707 | #ifdef USE_PAM |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 708 | if (options.use_pam && !is_pam_password_change_required()) |
Kevin Steves | 092f2ef | 2000-10-14 13:36:13 +0000 | [diff] [blame] | 709 | print_pam_messages(); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 710 | #endif /* USE_PAM */ |
Darren Tucker | b9aa0a0 | 2003-07-08 22:59:59 +1000 | [diff] [blame] | 711 | |
| 712 | /* display post-login message */ |
| 713 | if (buffer_len(&loginmsg) > 0) { |
| 714 | buffer_append(&loginmsg, "\0", 1); |
| 715 | printf("%s\n", (char *)buffer_ptr(&loginmsg)); |
| 716 | } |
| 717 | buffer_free(&loginmsg); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 718 | |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 719 | #ifndef NO_SSH_LASTLOG |
Ben Lindstrom | c447fee | 2002-04-02 20:35:35 +0000 | [diff] [blame] | 720 | if (options.print_lastlog && s->last_login_time != 0) { |
| 721 | time_string = ctime(&s->last_login_time); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 722 | if (strchr(time_string, '\n')) |
| 723 | *strchr(time_string, '\n') = 0; |
Ben Lindstrom | c447fee | 2002-04-02 20:35:35 +0000 | [diff] [blame] | 724 | if (strcmp(s->hostname, "") == 0) |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 725 | printf("Last login: %s\r\n", time_string); |
| 726 | else |
Ben Lindstrom | c447fee | 2002-04-02 20:35:35 +0000 | [diff] [blame] | 727 | printf("Last login: %s from %s\r\n", time_string, |
| 728 | s->hostname); |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 729 | } |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 730 | #endif /* NO_SSH_LASTLOG */ |
Damien Miller | cf205e8 | 2001-04-16 18:29:15 +1000 | [diff] [blame] | 731 | |
| 732 | do_motd(); |
| 733 | } |
| 734 | |
| 735 | /* |
| 736 | * Display the message of the day. |
| 737 | */ |
| 738 | void |
| 739 | do_motd(void) |
| 740 | { |
| 741 | FILE *f; |
| 742 | char buf[256]; |
| 743 | |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 744 | if (options.print_motd) { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 745 | #ifdef HAVE_LOGIN_CAP |
| 746 | f = fopen(login_getcapstr(lc, "welcome", "/etc/motd", |
| 747 | "/etc/motd"), "r"); |
| 748 | #else |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 749 | f = fopen("/etc/motd", "r"); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 750 | #endif |
Damien Miller | 942da03 | 2000-08-18 13:59:06 +1000 | [diff] [blame] | 751 | if (f) { |
| 752 | while (fgets(buf, sizeof(buf), f)) |
| 753 | fputs(buf, stdout); |
| 754 | fclose(f); |
| 755 | } |
| 756 | } |
| 757 | } |
| 758 | |
Kevin Steves | 8f63caa | 2001-07-04 18:23:02 +0000 | [diff] [blame] | 759 | |
| 760 | /* |
| 761 | * Check for quiet login, either .hushlogin or command given. |
| 762 | */ |
| 763 | int |
| 764 | check_quietlogin(Session *s, const char *command) |
| 765 | { |
| 766 | char buf[256]; |
| 767 | struct passwd *pw = s->pw; |
| 768 | struct stat st; |
| 769 | |
| 770 | /* Return 1 if .hushlogin exists or a command given. */ |
| 771 | if (command != NULL) |
| 772 | return 1; |
| 773 | snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir); |
| 774 | #ifdef HAVE_LOGIN_CAP |
| 775 | if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0) |
| 776 | return 1; |
| 777 | #else |
| 778 | if (stat(buf, &st) >= 0) |
| 779 | return 1; |
| 780 | #endif |
| 781 | return 0; |
| 782 | } |
| 783 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 784 | /* |
| 785 | * Sets the value of the given variable in the environment. If the variable |
| 786 | * already exists, its value is overriden. |
| 787 | */ |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 788 | void |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 789 | child_set_env(char ***envp, u_int *envsizep, const char *name, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 790 | const char *value) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 791 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 792 | char **env; |
Darren Tucker | fb16b24 | 2003-09-22 21:04:23 +1000 | [diff] [blame] | 793 | u_int envsize; |
| 794 | u_int i, namelen; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 795 | |
| 796 | /* |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 797 | * If we're passed an uninitialized list, allocate a single null |
| 798 | * entry before continuing. |
| 799 | */ |
| 800 | if (*envp == NULL && *envsizep == 0) { |
| 801 | *envp = xmalloc(sizeof(char *)); |
| 802 | *envp[0] = NULL; |
| 803 | *envsizep = 1; |
| 804 | } |
| 805 | |
| 806 | /* |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 807 | * Find the slot where the value should be stored. If the variable |
| 808 | * already exists, we reuse the slot; otherwise we append a new slot |
| 809 | * at the end of the array, expanding if necessary. |
| 810 | */ |
| 811 | env = *envp; |
| 812 | namelen = strlen(name); |
| 813 | for (i = 0; env[i]; i++) |
| 814 | if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=') |
| 815 | break; |
| 816 | if (env[i]) { |
| 817 | /* Reuse the slot. */ |
| 818 | xfree(env[i]); |
| 819 | } else { |
| 820 | /* New variable. Expand if necessary. */ |
Darren Tucker | fb16b24 | 2003-09-22 21:04:23 +1000 | [diff] [blame] | 821 | envsize = *envsizep; |
| 822 | if (i >= envsize - 1) { |
| 823 | if (envsize >= 1000) |
| 824 | fatal("child_set_env: too many env vars"); |
| 825 | envsize += 50; |
| 826 | env = (*envp) = xrealloc(env, envsize * sizeof(char *)); |
| 827 | *envsizep = envsize; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 828 | } |
| 829 | /* Need to set the NULL pointer at end of array beyond the new slot. */ |
| 830 | env[i + 1] = NULL; |
| 831 | } |
| 832 | |
| 833 | /* Allocate space and format the variable in the appropriate slot. */ |
| 834 | env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1); |
| 835 | snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value); |
| 836 | } |
| 837 | |
| 838 | /* |
| 839 | * Reads environment variables from the given file and adds/overrides them |
| 840 | * into the environment. If the file does not exist, this does nothing. |
| 841 | * Otherwise, it must consist of empty lines, comments (line starts with '#') |
| 842 | * and assignments of the form name=value. No other forms are allowed. |
| 843 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 844 | static void |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 845 | read_environment_file(char ***env, u_int *envsize, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 846 | const char *filename) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 847 | { |
| 848 | FILE *f; |
| 849 | char buf[4096]; |
| 850 | char *cp, *value; |
Damien Miller | 990070a | 2002-06-26 23:51:06 +1000 | [diff] [blame] | 851 | u_int lineno = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 852 | |
| 853 | f = fopen(filename, "r"); |
| 854 | if (!f) |
| 855 | return; |
| 856 | |
| 857 | while (fgets(buf, sizeof(buf), f)) { |
Damien Miller | 990070a | 2002-06-26 23:51:06 +1000 | [diff] [blame] | 858 | if (++lineno > 1000) |
| 859 | fatal("Too many lines in environment file %s", filename); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 860 | for (cp = buf; *cp == ' ' || *cp == '\t'; cp++) |
| 861 | ; |
| 862 | if (!*cp || *cp == '#' || *cp == '\n') |
| 863 | continue; |
| 864 | if (strchr(cp, '\n')) |
| 865 | *strchr(cp, '\n') = '\0'; |
| 866 | value = strchr(cp, '='); |
| 867 | if (value == NULL) { |
Damien Miller | 990070a | 2002-06-26 23:51:06 +1000 | [diff] [blame] | 868 | fprintf(stderr, "Bad line %u in %.100s\n", lineno, |
| 869 | filename); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 870 | continue; |
| 871 | } |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 872 | /* |
| 873 | * Replace the equals sign by nul, and advance value to |
| 874 | * the value string. |
| 875 | */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 876 | *value = '\0'; |
| 877 | value++; |
| 878 | child_set_env(env, envsize, cp, value); |
| 879 | } |
| 880 | fclose(f); |
| 881 | } |
| 882 | |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 883 | #ifdef HAVE_ETC_DEFAULT_LOGIN |
| 884 | /* |
| 885 | * Return named variable from specified environment, or NULL if not present. |
| 886 | */ |
| 887 | static char * |
| 888 | child_get_env(char **env, const char *name) |
| 889 | { |
| 890 | int i; |
| 891 | size_t len; |
| 892 | |
| 893 | len = strlen(name); |
| 894 | for (i=0; env[i] != NULL; i++) |
| 895 | if (strncmp(name, env[i], len) == 0 && env[i][len] == '=') |
| 896 | return(env[i] + len + 1); |
| 897 | return NULL; |
| 898 | } |
| 899 | |
| 900 | /* |
| 901 | * Read /etc/default/login. |
| 902 | * We pick up the PATH (or SUPATH for root) and UMASK. |
| 903 | */ |
| 904 | static void |
| 905 | read_etc_default_login(char ***env, u_int *envsize, uid_t uid) |
| 906 | { |
| 907 | char **tmpenv = NULL, *var; |
Darren Tucker | c11b1e8 | 2003-09-19 20:56:51 +1000 | [diff] [blame] | 908 | u_int i, tmpenvsize = 0; |
Darren Tucker | f391ba6 | 2003-10-02 20:07:09 +1000 | [diff] [blame] | 909 | u_long mask; |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 910 | |
| 911 | /* |
| 912 | * We don't want to copy the whole file to the child's environment, |
| 913 | * so we use a temporary environment and copy the variables we're |
| 914 | * interested in. |
| 915 | */ |
| 916 | read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login"); |
| 917 | |
Darren Tucker | c11b1e8 | 2003-09-19 20:56:51 +1000 | [diff] [blame] | 918 | if (tmpenv == NULL) |
| 919 | return; |
| 920 | |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 921 | if (uid == 0) |
| 922 | var = child_get_env(tmpenv, "SUPATH"); |
| 923 | else |
| 924 | var = child_get_env(tmpenv, "PATH"); |
| 925 | if (var != NULL) |
| 926 | child_set_env(env, envsize, "PATH", var); |
| 927 | |
| 928 | if ((var = child_get_env(tmpenv, "UMASK")) != NULL) |
| 929 | if (sscanf(var, "%5lo", &mask) == 1) |
Darren Tucker | f391ba6 | 2003-10-02 20:07:09 +1000 | [diff] [blame] | 930 | umask((mode_t)mask); |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 931 | |
| 932 | for (i = 0; tmpenv[i] != NULL; i++) |
| 933 | xfree(tmpenv[i]); |
| 934 | xfree(tmpenv); |
| 935 | } |
| 936 | #endif /* HAVE_ETC_DEFAULT_LOGIN */ |
| 937 | |
Damien Miller | bb9ffc1 | 2002-01-08 10:59:32 +1100 | [diff] [blame] | 938 | void copy_environment(char **source, char ***env, u_int *envsize) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 939 | { |
Damien Miller | bb9ffc1 | 2002-01-08 10:59:32 +1100 | [diff] [blame] | 940 | char *var_name, *var_val; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 941 | int i; |
| 942 | |
Damien Miller | bb9ffc1 | 2002-01-08 10:59:32 +1100 | [diff] [blame] | 943 | if (source == NULL) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 944 | return; |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 945 | |
Damien Miller | bb9ffc1 | 2002-01-08 10:59:32 +1100 | [diff] [blame] | 946 | for(i = 0; source[i] != NULL; i++) { |
| 947 | var_name = xstrdup(source[i]); |
| 948 | if ((var_val = strstr(var_name, "=")) == NULL) { |
| 949 | xfree(var_name); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 950 | continue; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 951 | } |
Damien Miller | bb9ffc1 | 2002-01-08 10:59:32 +1100 | [diff] [blame] | 952 | *var_val++ = '\0'; |
| 953 | |
| 954 | debug3("Copy environment: %s=%s", var_name, var_val); |
| 955 | child_set_env(env, envsize, var_name, var_val); |
| 956 | |
| 957 | xfree(var_name); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 958 | } |
| 959 | } |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 960 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 961 | static char ** |
| 962 | do_setup_env(Session *s, const char *shell) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 963 | { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 964 | char buf[256]; |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 965 | u_int i, envsize; |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 966 | char **env, *laddr, *path = NULL; |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 967 | struct passwd *pw = s->pw; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 968 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 969 | /* Initialize the environment. */ |
| 970 | envsize = 100; |
| 971 | env = xmalloc(envsize * sizeof(char *)); |
| 972 | env[0] = NULL; |
| 973 | |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 974 | #ifdef HAVE_CYGWIN |
| 975 | /* |
| 976 | * The Windows environment contains some setting which are |
| 977 | * important for a running system. They must not be dropped. |
| 978 | */ |
Damien Miller | bb9ffc1 | 2002-01-08 10:59:32 +1100 | [diff] [blame] | 979 | copy_environment(environ, &env, &envsize); |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 980 | #endif |
| 981 | |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 982 | #ifdef GSSAPI |
| 983 | /* Allow any GSSAPI methods that we've used to alter |
| 984 | * the childs environment as they see fit |
| 985 | */ |
| 986 | ssh_gssapi_do_child(&env, &envsize); |
| 987 | #endif |
| 988 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 989 | if (!options.use_login) { |
| 990 | /* Set basic environment. */ |
| 991 | child_set_env(&env, &envsize, "USER", pw->pw_name); |
| 992 | child_set_env(&env, &envsize, "LOGNAME", pw->pw_name); |
Damien Miller | dfedbf8 | 2003-01-03 14:52:53 +1100 | [diff] [blame] | 993 | #ifdef _AIX |
| 994 | child_set_env(&env, &envsize, "LOGIN", pw->pw_name); |
| 995 | #endif |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 996 | child_set_env(&env, &envsize, "HOME", pw->pw_dir); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 997 | #ifdef HAVE_LOGIN_CAP |
Ben Lindstrom | b9051ec | 2002-07-23 21:11:09 +0000 | [diff] [blame] | 998 | if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0) |
| 999 | child_set_env(&env, &envsize, "PATH", _PATH_STDPATH); |
| 1000 | else |
| 1001 | child_set_env(&env, &envsize, "PATH", getenv("PATH")); |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 1002 | #else /* HAVE_LOGIN_CAP */ |
| 1003 | # ifndef HAVE_CYGWIN |
Damien Miller | bac2d8a | 2000-09-05 16:13:06 +1100 | [diff] [blame] | 1004 | /* |
| 1005 | * There's no standard path on Windows. The path contains |
| 1006 | * important components pointing to the system directories, |
| 1007 | * needed for loading shared libraries. So the path better |
| 1008 | * remains intact here. |
| 1009 | */ |
Darren Tucker | e1a790d | 2003-09-16 11:52:19 +1000 | [diff] [blame] | 1010 | # ifdef HAVE_ETC_DEFAULT_LOGIN |
| 1011 | read_etc_default_login(&env, &envsize, pw->pw_uid); |
| 1012 | path = child_get_env(env, "PATH"); |
| 1013 | # endif /* HAVE_ETC_DEFAULT_LOGIN */ |
| 1014 | if (path == NULL || *path == '\0') { |
| 1015 | child_set_env(&env, &envsize, "PATH", |
| 1016 | s->pw->pw_uid == 0 ? |
| 1017 | SUPERUSER_PATH : _PATH_STDPATH); |
| 1018 | } |
Damien Miller | cb5e44a | 2000-09-29 12:12:36 +1100 | [diff] [blame] | 1019 | # endif /* HAVE_CYGWIN */ |
| 1020 | #endif /* HAVE_LOGIN_CAP */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1021 | |
| 1022 | snprintf(buf, sizeof buf, "%.200s/%.50s", |
| 1023 | _PATH_MAILDIR, pw->pw_name); |
| 1024 | child_set_env(&env, &envsize, "MAIL", buf); |
| 1025 | |
| 1026 | /* Normal systems set SHELL by default. */ |
| 1027 | child_set_env(&env, &envsize, "SHELL", shell); |
| 1028 | } |
| 1029 | if (getenv("TZ")) |
| 1030 | child_set_env(&env, &envsize, "TZ", getenv("TZ")); |
| 1031 | |
| 1032 | /* Set custom environment options from RSA authentication. */ |
Ben Lindstrom | 38b951c | 2001-12-06 17:47:47 +0000 | [diff] [blame] | 1033 | if (!options.use_login) { |
| 1034 | while (custom_environment) { |
| 1035 | struct envstring *ce = custom_environment; |
Ben Lindstrom | 5a9d0ea | 2002-07-04 00:12:53 +0000 | [diff] [blame] | 1036 | char *str = ce->s; |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1037 | |
Ben Lindstrom | 5a9d0ea | 2002-07-04 00:12:53 +0000 | [diff] [blame] | 1038 | for (i = 0; str[i] != '=' && str[i]; i++) |
Ben Lindstrom | 38b951c | 2001-12-06 17:47:47 +0000 | [diff] [blame] | 1039 | ; |
Ben Lindstrom | 5a9d0ea | 2002-07-04 00:12:53 +0000 | [diff] [blame] | 1040 | if (str[i] == '=') { |
| 1041 | str[i] = 0; |
| 1042 | child_set_env(&env, &envsize, str, str + i + 1); |
Ben Lindstrom | 38b951c | 2001-12-06 17:47:47 +0000 | [diff] [blame] | 1043 | } |
| 1044 | custom_environment = ce->next; |
| 1045 | xfree(ce->s); |
| 1046 | xfree(ce); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1047 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1048 | } |
| 1049 | |
Damien Miller | f37e246 | 2002-09-19 11:47:55 +1000 | [diff] [blame] | 1050 | /* SSH_CLIENT deprecated */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1051 | snprintf(buf, sizeof buf, "%.50s %d %d", |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1052 | get_remote_ipaddr(), get_remote_port(), get_local_port()); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1053 | child_set_env(&env, &envsize, "SSH_CLIENT", buf); |
| 1054 | |
Damien Miller | 0011138 | 2003-03-10 11:21:17 +1100 | [diff] [blame] | 1055 | laddr = get_local_ipaddr(packet_get_connection_in()); |
Damien Miller | f37e246 | 2002-09-19 11:47:55 +1000 | [diff] [blame] | 1056 | snprintf(buf, sizeof buf, "%.50s %d %.50s %d", |
Damien Miller | 0011138 | 2003-03-10 11:21:17 +1100 | [diff] [blame] | 1057 | get_remote_ipaddr(), get_remote_port(), laddr, get_local_port()); |
| 1058 | xfree(laddr); |
Damien Miller | f37e246 | 2002-09-19 11:47:55 +1000 | [diff] [blame] | 1059 | child_set_env(&env, &envsize, "SSH_CONNECTION", buf); |
| 1060 | |
Ben Lindstrom | 86fe868 | 2001-03-17 00:32:57 +0000 | [diff] [blame] | 1061 | if (s->ttyfd != -1) |
| 1062 | child_set_env(&env, &envsize, "SSH_TTY", s->tty); |
| 1063 | if (s->term) |
| 1064 | child_set_env(&env, &envsize, "TERM", s->term); |
| 1065 | if (s->display) |
| 1066 | child_set_env(&env, &envsize, "DISPLAY", s->display); |
Damien Miller | 7b28dc5 | 2000-09-05 13:34:53 +1100 | [diff] [blame] | 1067 | if (original_command) |
| 1068 | child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND", |
| 1069 | original_command); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1070 | |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 1071 | #ifdef _UNICOS |
| 1072 | if (cray_tmpdir[0] != '\0') |
| 1073 | child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir); |
| 1074 | #endif /* _UNICOS */ |
| 1075 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1076 | #ifdef _AIX |
Ben Lindstrom | 839ac4f | 2002-02-24 20:42:46 +0000 | [diff] [blame] | 1077 | { |
| 1078 | char *cp; |
| 1079 | |
| 1080 | if ((cp = getenv("AUTHSTATE")) != NULL) |
| 1081 | child_set_env(&env, &envsize, "AUTHSTATE", cp); |
| 1082 | if ((cp = getenv("KRB5CCNAME")) != NULL) |
| 1083 | child_set_env(&env, &envsize, "KRB5CCNAME", cp); |
| 1084 | read_environment_file(&env, &envsize, "/etc/environment"); |
| 1085 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1086 | #endif |
Ben Lindstrom | ec95ed9 | 2001-07-04 04:21:14 +0000 | [diff] [blame] | 1087 | #ifdef KRB5 |
| 1088 | if (s->authctxt->krb5_ticket_file) |
| 1089 | child_set_env(&env, &envsize, "KRB5CCNAME", |
| 1090 | s->authctxt->krb5_ticket_file); |
| 1091 | #endif |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1092 | #ifdef USE_PAM |
Kevin Steves | 38b050a | 2002-07-23 00:44:07 +0000 | [diff] [blame] | 1093 | /* |
| 1094 | * Pull in any environment variables that may have |
| 1095 | * been set by PAM. |
| 1096 | */ |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 1097 | if (options.use_pam) { |
| 1098 | char **p = fetch_pam_environment(); |
Kevin Steves | 38b050a | 2002-07-23 00:44:07 +0000 | [diff] [blame] | 1099 | |
Kevin Steves | 38b050a | 2002-07-23 00:44:07 +0000 | [diff] [blame] | 1100 | copy_environment(p, &env, &envsize); |
| 1101 | free_pam_environment(p); |
| 1102 | } |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1103 | #endif /* USE_PAM */ |
| 1104 | |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 1105 | if (auth_sock_name != NULL) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1106 | child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME, |
Ben Lindstrom | 8bb6f36 | 2002-06-11 15:59:02 +0000 | [diff] [blame] | 1107 | auth_sock_name); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1108 | |
| 1109 | /* read $HOME/.ssh/environment. */ |
Ben Lindstrom | 5d860f0 | 2002-08-01 01:28:38 +0000 | [diff] [blame] | 1110 | if (options.permit_user_env && !options.use_login) { |
Damien Miller | b1715dc | 2000-05-30 13:44:51 +1000 | [diff] [blame] | 1111 | snprintf(buf, sizeof buf, "%.200s/.ssh/environment", |
Damien Miller | e9994cb | 2002-09-10 21:43:53 +1000 | [diff] [blame] | 1112 | strcmp(pw->pw_dir, "/") ? pw->pw_dir : ""); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1113 | read_environment_file(&env, &envsize, buf); |
| 1114 | } |
| 1115 | if (debug_flag) { |
| 1116 | /* dump the environment */ |
| 1117 | fprintf(stderr, "Environment:\n"); |
| 1118 | for (i = 0; env[i]; i++) |
| 1119 | fprintf(stderr, " %.200s\n", env[i]); |
| 1120 | } |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1121 | return env; |
| 1122 | } |
| 1123 | |
| 1124 | /* |
| 1125 | * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found |
| 1126 | * first in this order). |
| 1127 | */ |
| 1128 | static void |
| 1129 | do_rc_files(Session *s, const char *shell) |
| 1130 | { |
| 1131 | FILE *f = NULL; |
| 1132 | char cmd[1024]; |
| 1133 | int do_xauth; |
| 1134 | struct stat st; |
| 1135 | |
| 1136 | do_xauth = |
| 1137 | s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL; |
| 1138 | |
| 1139 | /* ignore _PATH_SSH_USER_RC for subsystems */ |
| 1140 | if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) { |
| 1141 | snprintf(cmd, sizeof cmd, "%s -c '%s %s'", |
| 1142 | shell, _PATH_BSHELL, _PATH_SSH_USER_RC); |
| 1143 | if (debug_flag) |
| 1144 | fprintf(stderr, "Running %s\n", cmd); |
| 1145 | f = popen(cmd, "w"); |
| 1146 | if (f) { |
| 1147 | if (do_xauth) |
| 1148 | fprintf(f, "%s %s\n", s->auth_proto, |
| 1149 | s->auth_data); |
| 1150 | pclose(f); |
| 1151 | } else |
| 1152 | fprintf(stderr, "Could not run %s\n", |
| 1153 | _PATH_SSH_USER_RC); |
| 1154 | } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) { |
| 1155 | if (debug_flag) |
| 1156 | fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, |
| 1157 | _PATH_SSH_SYSTEM_RC); |
| 1158 | f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w"); |
| 1159 | if (f) { |
| 1160 | if (do_xauth) |
| 1161 | fprintf(f, "%s %s\n", s->auth_proto, |
| 1162 | s->auth_data); |
| 1163 | pclose(f); |
| 1164 | } else |
| 1165 | fprintf(stderr, "Could not run %s\n", |
| 1166 | _PATH_SSH_SYSTEM_RC); |
| 1167 | } else if (do_xauth && options.xauth_location != NULL) { |
| 1168 | /* Add authority data to .Xauthority if appropriate. */ |
| 1169 | if (debug_flag) { |
| 1170 | fprintf(stderr, |
Ben Lindstrom | 611797e | 2002-12-23 02:15:57 +0000 | [diff] [blame] | 1171 | "Running %.500s remove %.100s\n", |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 1172 | options.xauth_location, s->auth_display); |
Ben Lindstrom | 611797e | 2002-12-23 02:15:57 +0000 | [diff] [blame] | 1173 | fprintf(stderr, |
| 1174 | "%.500s add %.100s %.100s %.100s\n", |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1175 | options.xauth_location, s->auth_display, |
| 1176 | s->auth_proto, s->auth_data); |
| 1177 | } |
| 1178 | snprintf(cmd, sizeof cmd, "%s -q -", |
| 1179 | options.xauth_location); |
| 1180 | f = popen(cmd, "w"); |
| 1181 | if (f) { |
Ben Lindstrom | 611797e | 2002-12-23 02:15:57 +0000 | [diff] [blame] | 1182 | fprintf(f, "remove %s\n", |
| 1183 | s->auth_display); |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1184 | fprintf(f, "add %s %s %s\n", |
| 1185 | s->auth_display, s->auth_proto, |
| 1186 | s->auth_data); |
| 1187 | pclose(f); |
| 1188 | } else { |
| 1189 | fprintf(stderr, "Could not run %s\n", |
| 1190 | cmd); |
| 1191 | } |
| 1192 | } |
| 1193 | } |
| 1194 | |
| 1195 | static void |
| 1196 | do_nologin(struct passwd *pw) |
| 1197 | { |
| 1198 | FILE *f = NULL; |
| 1199 | char buf[1024]; |
| 1200 | |
| 1201 | #ifdef HAVE_LOGIN_CAP |
| 1202 | if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid) |
| 1203 | f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN, |
| 1204 | _PATH_NOLOGIN), "r"); |
| 1205 | #else |
| 1206 | if (pw->pw_uid) |
| 1207 | f = fopen(_PATH_NOLOGIN, "r"); |
| 1208 | #endif |
| 1209 | if (f) { |
| 1210 | /* /etc/nologin exists. Print its contents and exit. */ |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1211 | logit("User %.100s not allowed because %s exists", |
Damien Miller | a6eb2b7 | 2002-09-19 11:50:48 +1000 | [diff] [blame] | 1212 | pw->pw_name, _PATH_NOLOGIN); |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1213 | while (fgets(buf, sizeof(buf), f)) |
| 1214 | fputs(buf, stderr); |
| 1215 | fclose(f); |
Damien Miller | f25c18d | 2003-01-07 17:38:58 +1100 | [diff] [blame] | 1216 | fflush(NULL); |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1217 | exit(254); |
| 1218 | } |
| 1219 | } |
| 1220 | |
| 1221 | /* Set login name, uid, gid, and groups. */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1222 | void |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1223 | do_setusercontext(struct passwd *pw) |
| 1224 | { |
Damien Miller | 1a3ccb0 | 2003-02-24 13:04:01 +1100 | [diff] [blame] | 1225 | #ifndef HAVE_CYGWIN |
| 1226 | if (getuid() == 0 || geteuid() == 0) |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1227 | #endif /* HAVE_CYGWIN */ |
Damien Miller | 1a3ccb0 | 2003-02-24 13:04:01 +1100 | [diff] [blame] | 1228 | { |
| 1229 | |
Ben Lindstrom | f0bfa83 | 2002-06-21 00:01:18 +0000 | [diff] [blame] | 1230 | #ifdef HAVE_SETPCRED |
Darren Tucker | 793e817 | 2003-07-08 21:01:04 +1000 | [diff] [blame] | 1231 | if (setpcred(pw->pw_name, (char **)NULL) == -1) |
| 1232 | fatal("Failed to set process credentials"); |
Ben Lindstrom | f0bfa83 | 2002-06-21 00:01:18 +0000 | [diff] [blame] | 1233 | #endif /* HAVE_SETPCRED */ |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1234 | #ifdef HAVE_LOGIN_CAP |
Ben Lindstrom | 938b828 | 2002-07-15 17:58:34 +0000 | [diff] [blame] | 1235 | # ifdef __bsdi__ |
Damien Miller | f18cd16 | 2002-06-26 19:12:59 +1000 | [diff] [blame] | 1236 | setpgid(0, 0); |
Ben Lindstrom | 938b828 | 2002-07-15 17:58:34 +0000 | [diff] [blame] | 1237 | # endif |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1238 | if (setusercontext(lc, pw, pw->pw_uid, |
| 1239 | (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) { |
| 1240 | perror("unable to set user context"); |
| 1241 | exit(1); |
| 1242 | } |
| 1243 | #else |
| 1244 | # if defined(HAVE_GETLUID) && defined(HAVE_SETLUID) |
| 1245 | /* Sets login uid for accounting */ |
| 1246 | if (getluid() == -1 && setluid(pw->pw_uid) == -1) |
| 1247 | error("setluid: %s", strerror(errno)); |
| 1248 | # endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */ |
| 1249 | |
| 1250 | if (setlogin(pw->pw_name) < 0) |
| 1251 | error("setlogin failed: %s", strerror(errno)); |
| 1252 | if (setgid(pw->pw_gid) < 0) { |
| 1253 | perror("setgid"); |
| 1254 | exit(1); |
| 1255 | } |
| 1256 | /* Initialize the group list. */ |
| 1257 | if (initgroups(pw->pw_name, pw->pw_gid) < 0) { |
| 1258 | perror("initgroups"); |
| 1259 | exit(1); |
| 1260 | } |
| 1261 | endgrent(); |
| 1262 | # ifdef USE_PAM |
| 1263 | /* |
| 1264 | * PAM credentials may take the form of supplementary groups. |
| 1265 | * These will have been wiped by the above initgroups() call. |
| 1266 | * Reestablish them here. |
| 1267 | */ |
Damien Miller | 341c6e6 | 2003-09-02 23:18:52 +1000 | [diff] [blame] | 1268 | if (options.use_pam) { |
| 1269 | do_pam_session(); |
Damien Miller | 4e448a3 | 2003-05-14 15:11:48 +1000 | [diff] [blame] | 1270 | do_pam_setcred(0); |
Damien Miller | 341c6e6 | 2003-09-02 23:18:52 +1000 | [diff] [blame] | 1271 | } |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1272 | # endif /* USE_PAM */ |
| 1273 | # if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) |
| 1274 | irix_setusercontext(pw); |
| 1275 | # 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] | 1276 | # ifdef _AIX |
Ben Lindstrom | 51b2488 | 2002-07-04 03:08:40 +0000 | [diff] [blame] | 1277 | aix_usrinfo(pw); |
Ben Lindstrom | b129be6 | 2002-06-25 17:12:26 +0000 | [diff] [blame] | 1278 | # endif /* _AIX */ |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1279 | /* Permanently switch to the desired uid. */ |
| 1280 | permanently_set_uid(pw); |
| 1281 | #endif |
| 1282 | } |
Damien Miller | 1a3ccb0 | 2003-02-24 13:04:01 +1100 | [diff] [blame] | 1283 | |
| 1284 | #ifdef HAVE_CYGWIN |
| 1285 | if (is_winnt) |
| 1286 | #endif |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1287 | if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid) |
| 1288 | fatal("Failed to set uids to %u.", (u_int) pw->pw_uid); |
| 1289 | } |
| 1290 | |
Ben Lindstrom | 0810519 | 2002-03-22 02:50:06 +0000 | [diff] [blame] | 1291 | static void |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1292 | launch_login(struct passwd *pw, const char *hostname) |
| 1293 | { |
| 1294 | /* Launch login(1). */ |
| 1295 | |
Ben Lindstrom | 378a417 | 2002-06-07 14:49:56 +0000 | [diff] [blame] | 1296 | execl(LOGIN_PROGRAM, "login", "-h", hostname, |
Kevin Steves | b4799a3 | 2002-03-24 23:19:54 +0000 | [diff] [blame] | 1297 | #ifdef xxxLOGIN_NEEDS_TERM |
Ben Lindstrom | 5a6abda | 2002-06-09 19:41:48 +0000 | [diff] [blame] | 1298 | (s->term ? s->term : "unknown"), |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1299 | #endif /* LOGIN_NEEDS_TERM */ |
Kevin Steves | 5feaaef | 2002-04-23 20:45:55 +0000 | [diff] [blame] | 1300 | #ifdef LOGIN_NO_ENDOPT |
| 1301 | "-p", "-f", pw->pw_name, (char *)NULL); |
| 1302 | #else |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1303 | "-p", "-f", "--", pw->pw_name, (char *)NULL); |
Kevin Steves | 5feaaef | 2002-04-23 20:45:55 +0000 | [diff] [blame] | 1304 | #endif |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1305 | |
| 1306 | /* Login couldn't be executed, die. */ |
| 1307 | |
| 1308 | perror("login"); |
| 1309 | exit(1); |
| 1310 | } |
| 1311 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1312 | /* |
| 1313 | * Performs common processing for the child, such as setting up the |
| 1314 | * environment, closing extra file descriptors, setting the user and group |
| 1315 | * ids, and executing the command or shell. |
| 1316 | */ |
| 1317 | void |
| 1318 | do_child(Session *s, const char *command) |
| 1319 | { |
| 1320 | extern char **environ; |
| 1321 | char **env; |
| 1322 | char *argv[10]; |
| 1323 | const char *shell, *shell0, *hostname = NULL; |
| 1324 | struct passwd *pw = s->pw; |
| 1325 | u_int i; |
| 1326 | |
| 1327 | /* remove hostkey from the child's memory */ |
| 1328 | destroy_sensitive_data(); |
| 1329 | |
| 1330 | /* login(1) is only called if we execute the login shell */ |
| 1331 | if (options.use_login && command != NULL) |
| 1332 | options.use_login = 0; |
| 1333 | |
Tim Rice | 81ed518 | 2002-09-25 17:38:46 -0700 | [diff] [blame] | 1334 | #ifdef _UNICOS |
| 1335 | cray_setup(pw->pw_uid, pw->pw_name, command); |
| 1336 | #endif /* _UNICOS */ |
| 1337 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1338 | /* |
| 1339 | * Login(1) does this as well, and it needs uid 0 for the "-h" |
| 1340 | * switch, so we let login(1) to this for us. |
| 1341 | */ |
| 1342 | if (!options.use_login) { |
| 1343 | #ifdef HAVE_OSF_SIA |
Ben Lindstrom | c8c548d | 2003-03-21 01:18:09 +0000 | [diff] [blame] | 1344 | session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty); |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1345 | if (!check_quietlogin(s, command)) |
| 1346 | do_motd(); |
| 1347 | #else /* HAVE_OSF_SIA */ |
| 1348 | do_nologin(pw); |
| 1349 | do_setusercontext(pw); |
| 1350 | #endif /* HAVE_OSF_SIA */ |
| 1351 | } |
| 1352 | |
| 1353 | /* |
| 1354 | * Get the shell from the password data. An empty shell field is |
| 1355 | * legal, and means /bin/sh. |
| 1356 | */ |
| 1357 | shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell; |
Ben Lindstrom | 4676760 | 2002-12-23 02:26:08 +0000 | [diff] [blame] | 1358 | |
| 1359 | /* |
| 1360 | * Make sure $SHELL points to the shell from the password file, |
| 1361 | * even if shell is overridden from login.conf |
| 1362 | */ |
| 1363 | env = do_setup_env(s, shell); |
| 1364 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1365 | #ifdef HAVE_LOGIN_CAP |
| 1366 | shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell); |
| 1367 | #endif |
| 1368 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame] | 1369 | /* we have to stash the hostname before we close our socket. */ |
| 1370 | if (options.use_login) |
Ben Lindstrom | f15a386 | 2001-04-05 23:32:17 +0000 | [diff] [blame] | 1371 | hostname = get_remote_name_or_ip(utmp_len, |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 1372 | options.use_dns); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1373 | /* |
| 1374 | * Close the connection descriptors; note that this is the child, and |
| 1375 | * the server will still have the socket open, and it is important |
| 1376 | * that we do not shutdown it. Note that the descriptors cannot be |
| 1377 | * closed before building the environment, as we call |
| 1378 | * get_remote_ipaddr there. |
| 1379 | */ |
| 1380 | if (packet_get_connection_in() == packet_get_connection_out()) |
| 1381 | close(packet_get_connection_in()); |
| 1382 | else { |
| 1383 | close(packet_get_connection_in()); |
| 1384 | close(packet_get_connection_out()); |
| 1385 | } |
| 1386 | /* |
| 1387 | * Close all descriptors related to channels. They will still remain |
| 1388 | * open in the parent. |
| 1389 | */ |
| 1390 | /* XXX better use close-on-exec? -markus */ |
| 1391 | channel_close_all(); |
| 1392 | |
| 1393 | /* |
| 1394 | * Close any extra file descriptors. Note that there may still be |
| 1395 | * descriptors left by system functions. They will be closed later. |
| 1396 | */ |
| 1397 | endpwent(); |
| 1398 | |
| 1399 | /* |
| 1400 | * Close any extra open file descriptors so that we don\'t have them |
| 1401 | * hanging around in clients. Note that we want to do this after |
| 1402 | * initgroups, because at least on Solaris 2.3 it leaves file |
| 1403 | * descriptors open. |
| 1404 | */ |
| 1405 | for (i = 3; i < 64; i++) |
| 1406 | close(i); |
| 1407 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1408 | /* |
Damien Miller | 05eda43 | 2002-02-10 18:32:28 +1100 | [diff] [blame] | 1409 | * Must take new environment into use so that .ssh/rc, |
| 1410 | * /etc/ssh/sshrc and xauth are run in the proper environment. |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1411 | */ |
| 1412 | environ = env; |
| 1413 | |
Damien Miller | 139d4cd | 2001-10-10 15:07:44 +1000 | [diff] [blame] | 1414 | /* Change current directory to the user\'s home directory. */ |
| 1415 | if (chdir(pw->pw_dir) < 0) { |
| 1416 | fprintf(stderr, "Could not chdir to home directory %s: %s\n", |
| 1417 | pw->pw_dir, strerror(errno)); |
| 1418 | #ifdef HAVE_LOGIN_CAP |
| 1419 | if (login_getcapbool(lc, "requirehome", 0)) |
| 1420 | exit(1); |
| 1421 | #endif |
| 1422 | } |
| 1423 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1424 | if (!options.use_login) |
| 1425 | do_rc_files(s, shell); |
Ben Lindstrom | de71cda | 2001-03-24 00:43:26 +0000 | [diff] [blame] | 1426 | |
| 1427 | /* restore SIGPIPE for child */ |
| 1428 | signal(SIGPIPE, SIG_DFL); |
| 1429 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1430 | if (options.use_login) { |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1431 | launch_login(pw, hostname); |
| 1432 | /* NEVERREACHED */ |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1433 | } |
| 1434 | |
| 1435 | /* Get the last component of the shell name. */ |
| 1436 | if ((shell0 = strrchr(shell, '/')) != NULL) |
| 1437 | shell0++; |
| 1438 | else |
| 1439 | shell0 = shell; |
| 1440 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1441 | /* |
| 1442 | * If we have no command, execute the shell. In this case, the shell |
| 1443 | * name to be passed in argv[0] is preceded by '-' to indicate that |
| 1444 | * this is a login shell. |
| 1445 | */ |
| 1446 | if (!command) { |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1447 | char argv0[256]; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1448 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1449 | /* Start the shell. Set initial character to '-'. */ |
| 1450 | argv0[0] = '-'; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1451 | |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1452 | if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1) |
| 1453 | >= sizeof(argv0) - 1) { |
| 1454 | errno = EINVAL; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1455 | perror(shell); |
| 1456 | exit(1); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1457 | } |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1458 | |
| 1459 | /* Execute the shell. */ |
| 1460 | argv[0] = argv0; |
| 1461 | argv[1] = NULL; |
| 1462 | execve(shell, argv, env); |
| 1463 | |
| 1464 | /* Executing the shell failed. */ |
| 1465 | perror(shell); |
| 1466 | exit(1); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1467 | } |
| 1468 | /* |
| 1469 | * Execute the command using the user's shell. This uses the -c |
| 1470 | * option to execute the command. |
| 1471 | */ |
Ben Lindstrom | 4e97e85 | 2002-02-19 21:50:43 +0000 | [diff] [blame] | 1472 | argv[0] = (char *) shell0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1473 | argv[1] = "-c"; |
| 1474 | argv[2] = (char *) command; |
| 1475 | argv[3] = NULL; |
| 1476 | execve(shell, argv, env); |
| 1477 | perror(shell); |
| 1478 | exit(1); |
| 1479 | } |
| 1480 | |
| 1481 | Session * |
| 1482 | session_new(void) |
| 1483 | { |
| 1484 | int i; |
| 1485 | static int did_init = 0; |
| 1486 | if (!did_init) { |
| 1487 | debug("session_new: init"); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1488 | for (i = 0; i < MAX_SESSIONS; i++) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1489 | sessions[i].used = 0; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1490 | } |
| 1491 | did_init = 1; |
| 1492 | } |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1493 | for (i = 0; i < MAX_SESSIONS; i++) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1494 | Session *s = &sessions[i]; |
| 1495 | if (! s->used) { |
Ben Lindstrom | 6029432 | 2001-03-26 05:38:25 +0000 | [diff] [blame] | 1496 | memset(s, 0, sizeof(*s)); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1497 | s->chanid = -1; |
| 1498 | s->ptyfd = -1; |
| 1499 | s->ttyfd = -1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1500 | s->used = 1; |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 1501 | s->self = i; |
Damien Miller | 15b2952 | 2000-10-14 12:33:48 +1100 | [diff] [blame] | 1502 | debug("session_new: session %d", i); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1503 | return s; |
| 1504 | } |
| 1505 | } |
| 1506 | return NULL; |
| 1507 | } |
| 1508 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1509 | static void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1510 | session_dump(void) |
| 1511 | { |
| 1512 | int i; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1513 | for (i = 0; i < MAX_SESSIONS; i++) { |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1514 | Session *s = &sessions[i]; |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 1515 | debug("dump: used %d session %d %p channel %d pid %ld", |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1516 | s->used, |
| 1517 | s->self, |
| 1518 | s, |
| 1519 | s->chanid, |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 1520 | (long)s->pid); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1521 | } |
| 1522 | } |
| 1523 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1524 | int |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 1525 | session_open(Authctxt *authctxt, int chanid) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1526 | { |
| 1527 | Session *s = session_new(); |
| 1528 | debug("session_open: channel %d", chanid); |
| 1529 | if (s == NULL) { |
| 1530 | error("no more sessions"); |
| 1531 | return 0; |
| 1532 | } |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 1533 | s->authctxt = authctxt; |
| 1534 | s->pw = authctxt->pw; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1535 | if (s->pw == NULL) |
Kevin Steves | 43cdef3 | 2001-02-11 14:12:08 +0000 | [diff] [blame] | 1536 | fatal("no user for session %d", s->self); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1537 | debug("session_open: session %d: link with channel %d", s->self, chanid); |
| 1538 | s->chanid = chanid; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1539 | return 1; |
| 1540 | } |
| 1541 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1542 | Session * |
| 1543 | session_by_tty(char *tty) |
| 1544 | { |
| 1545 | int i; |
| 1546 | for (i = 0; i < MAX_SESSIONS; i++) { |
| 1547 | Session *s = &sessions[i]; |
| 1548 | if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) { |
| 1549 | debug("session_by_tty: session %d tty %s", i, tty); |
| 1550 | return s; |
| 1551 | } |
| 1552 | } |
| 1553 | debug("session_by_tty: unknown tty %.100s", tty); |
| 1554 | session_dump(); |
| 1555 | return NULL; |
| 1556 | } |
| 1557 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1558 | static Session * |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1559 | session_by_channel(int id) |
| 1560 | { |
| 1561 | int i; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1562 | for (i = 0; i < MAX_SESSIONS; i++) { |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1563 | Session *s = &sessions[i]; |
| 1564 | if (s->used && s->chanid == id) { |
| 1565 | debug("session_by_channel: session %d channel %d", i, id); |
| 1566 | return s; |
| 1567 | } |
| 1568 | } |
| 1569 | debug("session_by_channel: unknown channel %d", id); |
| 1570 | session_dump(); |
| 1571 | return NULL; |
| 1572 | } |
| 1573 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1574 | static Session * |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1575 | session_by_pid(pid_t pid) |
| 1576 | { |
| 1577 | int i; |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 1578 | debug("session_by_pid: pid %ld", (long)pid); |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 1579 | for (i = 0; i < MAX_SESSIONS; i++) { |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1580 | Session *s = &sessions[i]; |
| 1581 | if (s->used && s->pid == pid) |
| 1582 | return s; |
| 1583 | } |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 1584 | error("session_by_pid: unknown pid %ld", (long)pid); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1585 | session_dump(); |
| 1586 | return NULL; |
| 1587 | } |
| 1588 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1589 | static int |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1590 | session_window_change_req(Session *s) |
| 1591 | { |
| 1592 | s->col = packet_get_int(); |
| 1593 | s->row = packet_get_int(); |
| 1594 | s->xpixel = packet_get_int(); |
| 1595 | s->ypixel = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1596 | packet_check_eom(); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1597 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
| 1598 | return 1; |
| 1599 | } |
| 1600 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1601 | static int |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1602 | session_pty_req(Session *s) |
| 1603 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1604 | u_int len; |
Ben Lindstrom | ae8e2d3 | 2001-04-14 23:13:02 +0000 | [diff] [blame] | 1605 | int n_bytes; |
Ben Lindstrom | 6328ab3 | 2002-03-22 02:54:23 +0000 | [diff] [blame] | 1606 | |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1607 | if (no_pty_flag) { |
| 1608 | debug("Allocating a pty not permitted for this authentication."); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1609 | return 0; |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1610 | } |
| 1611 | if (s->ttyfd != -1) { |
| 1612 | packet_disconnect("Protocol error: you already have a pty."); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1613 | return 0; |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1614 | } |
Ben Lindstrom | c447fee | 2002-04-02 20:35:35 +0000 | [diff] [blame] | 1615 | /* Get the time and hostname when the user last logged in. */ |
| 1616 | if (options.print_lastlog) { |
| 1617 | s->hostname[0] = '\0'; |
| 1618 | s->last_login_time = get_last_login_time(s->pw->pw_uid, |
| 1619 | s->pw->pw_name, s->hostname, sizeof(s->hostname)); |
| 1620 | } |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1621 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1622 | s->term = packet_get_string(&len); |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1623 | |
| 1624 | if (compat20) { |
| 1625 | s->col = packet_get_int(); |
| 1626 | s->row = packet_get_int(); |
| 1627 | } else { |
| 1628 | s->row = packet_get_int(); |
| 1629 | s->col = packet_get_int(); |
| 1630 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1631 | s->xpixel = packet_get_int(); |
| 1632 | s->ypixel = packet_get_int(); |
| 1633 | |
| 1634 | if (strcmp(s->term, "") == 0) { |
| 1635 | xfree(s->term); |
| 1636 | s->term = NULL; |
| 1637 | } |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1638 | |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1639 | /* Allocate a pty and open it. */ |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1640 | debug("Allocating pty."); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1641 | 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] | 1642 | if (s->term) |
| 1643 | xfree(s->term); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1644 | s->term = NULL; |
| 1645 | s->ptyfd = -1; |
| 1646 | s->ttyfd = -1; |
| 1647 | error("session_pty_req: session %d alloc failed", s->self); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 1648 | return 0; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1649 | } |
| 1650 | debug("session_pty_req: session %d alloc %s", s->self, s->tty); |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1651 | |
| 1652 | /* for SSH1 the tty modes length is not given */ |
| 1653 | if (!compat20) |
| 1654 | n_bytes = packet_remaining(); |
| 1655 | tty_parse_modes(s->ttyfd, &n_bytes); |
| 1656 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1657 | if (!use_privsep) |
| 1658 | pty_setowner(s->pw, s->tty); |
Ben Lindstrom | 49c1260 | 2001-06-13 04:37:36 +0000 | [diff] [blame] | 1659 | |
| 1660 | /* Set window size from the packet. */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1661 | pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel); |
| 1662 | |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1663 | packet_check_eom(); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 1664 | session_proctitle(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1665 | return 1; |
| 1666 | } |
| 1667 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1668 | static int |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1669 | session_subsystem_req(Session *s) |
| 1670 | { |
Damien Miller | ae45246 | 2001-10-10 15:08:06 +1000 | [diff] [blame] | 1671 | struct stat st; |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1672 | u_int len; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1673 | int success = 0; |
Damien Miller | ae45246 | 2001-10-10 15:08:06 +1000 | [diff] [blame] | 1674 | char *cmd, *subsys = packet_get_string(&len); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1675 | int i; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1676 | |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1677 | packet_check_eom(); |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1678 | logit("subsystem request for %.100s", subsys); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1679 | |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1680 | for (i = 0; i < options.num_subsystems; i++) { |
Damien Miller | ae45246 | 2001-10-10 15:08:06 +1000 | [diff] [blame] | 1681 | if (strcmp(subsys, options.subsystem_name[i]) == 0) { |
| 1682 | cmd = options.subsystem_command[i]; |
| 1683 | if (stat(cmd, &st) < 0) { |
| 1684 | error("subsystem: cannot stat %s: %s", cmd, |
| 1685 | strerror(errno)); |
| 1686 | break; |
| 1687 | } |
| 1688 | debug("subsystem: exec() %s", cmd); |
Ben Lindstrom | fc9b07d | 2001-03-22 01:27:23 +0000 | [diff] [blame] | 1689 | s->is_subsystem = 1; |
Damien Miller | ae45246 | 2001-10-10 15:08:06 +1000 | [diff] [blame] | 1690 | do_exec(s, cmd); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1691 | success = 1; |
Damien Miller | 5fab4b9 | 2002-02-05 12:15:07 +1100 | [diff] [blame] | 1692 | break; |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1693 | } |
| 1694 | } |
| 1695 | |
| 1696 | if (!success) |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1697 | logit("subsystem request for %.100s failed, subsystem not found", |
Damien Miller | ae45246 | 2001-10-10 15:08:06 +1000 | [diff] [blame] | 1698 | subsys); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1699 | |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1700 | xfree(subsys); |
| 1701 | return success; |
| 1702 | } |
| 1703 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1704 | static int |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1705 | session_x11_req(Session *s) |
| 1706 | { |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 1707 | int success; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1708 | |
| 1709 | s->single_connection = packet_get_char(); |
| 1710 | s->auth_proto = packet_get_string(NULL); |
| 1711 | s->auth_data = packet_get_string(NULL); |
| 1712 | s->screen = packet_get_int(); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1713 | packet_check_eom(); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1714 | |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 1715 | success = session_setup_x11fwd(s); |
| 1716 | if (!success) { |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1717 | xfree(s->auth_proto); |
| 1718 | xfree(s->auth_data); |
Ben Lindstrom | 88259fb | 2001-06-12 00:21:34 +0000 | [diff] [blame] | 1719 | s->auth_proto = NULL; |
| 1720 | s->auth_data = NULL; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1721 | } |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 1722 | return success; |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1723 | } |
| 1724 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1725 | static int |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1726 | session_shell_req(Session *s) |
| 1727 | { |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1728 | packet_check_eom(); |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 1729 | do_exec(s, NULL); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1730 | return 1; |
| 1731 | } |
| 1732 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1733 | static int |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1734 | session_exec_req(Session *s) |
| 1735 | { |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 1736 | u_int len; |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1737 | char *command = packet_get_string(&len); |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1738 | packet_check_eom(); |
Ben Lindstrom | c85ab8a | 2001-06-21 03:13:10 +0000 | [diff] [blame] | 1739 | do_exec(s, command); |
Ben Lindstrom | 0a7ca6c | 2001-06-21 03:17:42 +0000 | [diff] [blame] | 1740 | xfree(command); |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1741 | return 1; |
| 1742 | } |
| 1743 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1744 | static int |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 1745 | session_break_req(Session *s) |
| 1746 | { |
| 1747 | u_int break_length; |
| 1748 | |
Darren Tucker | 3bdbd84 | 2003-08-13 20:31:05 +1000 | [diff] [blame] | 1749 | break_length = packet_get_int(); /* ignored */ |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 1750 | packet_check_eom(); |
| 1751 | |
Darren Tucker | 3bdbd84 | 2003-08-13 20:31:05 +1000 | [diff] [blame] | 1752 | if (s->ttyfd == -1 || |
| 1753 | tcsendbreak(s->ttyfd, 0) < 0) |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 1754 | return 0; |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 1755 | return 1; |
| 1756 | } |
| 1757 | |
| 1758 | static int |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1759 | session_auth_agent_req(Session *s) |
| 1760 | { |
| 1761 | static int called = 0; |
Damien Miller | 48b03fc | 2002-01-22 23:11:40 +1100 | [diff] [blame] | 1762 | packet_check_eom(); |
Ben Lindstrom | 1492029 | 2000-11-21 21:24:55 +0000 | [diff] [blame] | 1763 | if (no_agent_forwarding_flag) { |
| 1764 | debug("session_auth_agent_req: no_agent_forwarding_flag"); |
| 1765 | return 0; |
| 1766 | } |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1767 | if (called) { |
| 1768 | return 0; |
| 1769 | } else { |
| 1770 | called = 1; |
| 1771 | return auth_input_request_forwarding(s->pw); |
| 1772 | } |
| 1773 | } |
| 1774 | |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1775 | int |
| 1776 | session_input_channel_req(Channel *c, const char *rtype) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1777 | { |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1778 | int success = 0; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1779 | Session *s; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1780 | |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1781 | if ((s = session_by_channel(c->self)) == NULL) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 1782 | logit("session_input_channel_req: no session %d req %.100s", |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1783 | c->self, rtype); |
| 1784 | return 0; |
| 1785 | } |
| 1786 | debug("session_input_channel_req: session %d req %s", s->self, rtype); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1787 | |
| 1788 | /* |
Ben Lindstrom | fc9b07d | 2001-03-22 01:27:23 +0000 | [diff] [blame] | 1789 | * a session is in LARVAL state until a shell, a command |
| 1790 | * or a subsystem is executed |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1791 | */ |
| 1792 | if (c->type == SSH_CHANNEL_LARVAL) { |
| 1793 | if (strcmp(rtype, "shell") == 0) { |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1794 | success = session_shell_req(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1795 | } else if (strcmp(rtype, "exec") == 0) { |
Damien Miller | f6d9e22 | 2000-06-18 14:50:44 +1000 | [diff] [blame] | 1796 | success = session_exec_req(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1797 | } else if (strcmp(rtype, "pty-req") == 0) { |
Damien Miller | 5f05637 | 2000-04-16 12:31:48 +1000 | [diff] [blame] | 1798 | success = session_pty_req(s); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1799 | } else if (strcmp(rtype, "x11-req") == 0) { |
| 1800 | success = session_x11_req(s); |
Damien Miller | 0bc1bd8 | 2000-11-13 22:57:25 +1100 | [diff] [blame] | 1801 | } else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) { |
| 1802 | success = session_auth_agent_req(s); |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1803 | } else if (strcmp(rtype, "subsystem") == 0) { |
| 1804 | success = session_subsystem_req(s); |
Damien Miller | 54c4598 | 2003-05-15 10:20:13 +1000 | [diff] [blame] | 1805 | } else if (strcmp(rtype, "break") == 0) { |
| 1806 | success = session_break_req(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1807 | } |
| 1808 | } |
| 1809 | if (strcmp(rtype, "window-change") == 0) { |
| 1810 | success = session_window_change_req(s); |
| 1811 | } |
Damien Miller | c7ef63d | 2002-02-05 12:21:42 +1100 | [diff] [blame] | 1812 | return success; |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1813 | } |
| 1814 | |
| 1815 | void |
| 1816 | session_set_fds(Session *s, int fdin, int fdout, int fderr) |
| 1817 | { |
| 1818 | if (!compat20) |
| 1819 | fatal("session_set_fds: called for proto != 2.0"); |
| 1820 | /* |
| 1821 | * now that have a child and a pipe to the child, |
| 1822 | * we can activate our channel and register the fd's |
| 1823 | */ |
| 1824 | if (s->chanid == -1) |
| 1825 | fatal("no channel for session %d", s->self); |
| 1826 | channel_set_fds(s->chanid, |
| 1827 | fdout, fdin, fderr, |
Damien Miller | 69b69aa | 2000-10-28 14:19:58 +1100 | [diff] [blame] | 1828 | fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ, |
Damien Miller | 19a5945 | 2002-02-19 15:20:57 +1100 | [diff] [blame] | 1829 | 1, |
| 1830 | CHAN_SES_WINDOW_DEFAULT); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1831 | } |
| 1832 | |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 1833 | /* |
| 1834 | * Function to perform pty cleanup. Also called if we get aborted abnormally |
| 1835 | * (e.g., due to a dropped connection). |
| 1836 | */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1837 | void |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 1838 | session_pty_cleanup2(Session *s) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1839 | { |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 1840 | if (s == NULL) { |
| 1841 | error("session_pty_cleanup: no session"); |
| 1842 | return; |
| 1843 | } |
| 1844 | if (s->ttyfd == -1) |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1845 | return; |
| 1846 | |
Kevin Steves | 43cdef3 | 2001-02-11 14:12:08 +0000 | [diff] [blame] | 1847 | debug("session_pty_cleanup: session %d release %s", s->self, s->tty); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1848 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1849 | /* Record that the user has logged out. */ |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 1850 | if (s->pid != 0) |
Tim Rice | e06ae4a | 2002-02-24 17:56:46 -0800 | [diff] [blame] | 1851 | record_logout(s->pid, s->tty, s->pw->pw_name); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1852 | |
| 1853 | /* Release the pseudo-tty. */ |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1854 | if (getuid() == 0) |
| 1855 | pty_release(s->tty); |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1856 | |
| 1857 | /* |
| 1858 | * Close the server side of the socket pairs. We must do this after |
| 1859 | * the pty cleanup, so that another process doesn't get this pty |
| 1860 | * while we're still cleaning up. |
| 1861 | */ |
| 1862 | if (close(s->ptymaster) < 0) |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1863 | error("close(s->ptymaster/%d): %s", s->ptymaster, strerror(errno)); |
Damien Miller | 0585d51 | 2001-10-12 11:35:50 +1000 | [diff] [blame] | 1864 | |
| 1865 | /* unlink pty from session */ |
| 1866 | s->ttyfd = -1; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame] | 1867 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1868 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1869 | void |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 1870 | session_pty_cleanup(Session *s) |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1871 | { |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 1872 | PRIVSEP(session_pty_cleanup2(s)); |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1873 | } |
| 1874 | |
Damien Miller | 5a80bba | 2002-09-04 16:39:02 +1000 | [diff] [blame] | 1875 | static char * |
| 1876 | sig2name(int sig) |
| 1877 | { |
| 1878 | #define SSH_SIG(x) if (sig == SIG ## x) return #x |
| 1879 | SSH_SIG(ABRT); |
| 1880 | SSH_SIG(ALRM); |
| 1881 | SSH_SIG(FPE); |
| 1882 | SSH_SIG(HUP); |
| 1883 | SSH_SIG(ILL); |
| 1884 | SSH_SIG(INT); |
| 1885 | SSH_SIG(KILL); |
| 1886 | SSH_SIG(PIPE); |
| 1887 | SSH_SIG(QUIT); |
| 1888 | SSH_SIG(SEGV); |
| 1889 | SSH_SIG(TERM); |
| 1890 | SSH_SIG(USR1); |
| 1891 | SSH_SIG(USR2); |
| 1892 | #undef SSH_SIG |
| 1893 | return "SIG@openssh.com"; |
| 1894 | } |
| 1895 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 1896 | static void |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1897 | session_exit_message(Session *s, int status) |
| 1898 | { |
| 1899 | Channel *c; |
Damien Miller | f3dcf1f | 2002-02-08 22:06:48 +1100 | [diff] [blame] | 1900 | |
| 1901 | if ((c = channel_lookup(s->chanid)) == NULL) |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 1902 | fatal("session_exit_message: session %d: no channel %d", |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1903 | s->self, s->chanid); |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 1904 | debug("session_exit_message: session %d channel %d pid %ld", |
| 1905 | s->self, s->chanid, (long)s->pid); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1906 | |
| 1907 | if (WIFEXITED(status)) { |
Damien Miller | f3dcf1f | 2002-02-08 22:06:48 +1100 | [diff] [blame] | 1908 | channel_request_start(s->chanid, "exit-status", 0); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1909 | packet_put_int(WEXITSTATUS(status)); |
| 1910 | packet_send(); |
| 1911 | } else if (WIFSIGNALED(status)) { |
Damien Miller | f3dcf1f | 2002-02-08 22:06:48 +1100 | [diff] [blame] | 1912 | channel_request_start(s->chanid, "exit-signal", 0); |
Damien Miller | 5a80bba | 2002-09-04 16:39:02 +1000 | [diff] [blame] | 1913 | packet_put_cstring(sig2name(WTERMSIG(status))); |
Damien Miller | f3c6cf1 | 2000-05-17 22:08:29 +1000 | [diff] [blame] | 1914 | #ifdef WCOREDUMP |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1915 | packet_put_char(WCOREDUMP(status)); |
Damien Miller | f3c6cf1 | 2000-05-17 22:08:29 +1000 | [diff] [blame] | 1916 | #else /* WCOREDUMP */ |
| 1917 | packet_put_char(0); |
| 1918 | #endif /* WCOREDUMP */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1919 | packet_put_cstring(""); |
| 1920 | packet_put_cstring(""); |
| 1921 | packet_send(); |
| 1922 | } else { |
| 1923 | /* Some weird exit cause. Just exit. */ |
| 1924 | packet_disconnect("wait returned status %04x.", status); |
| 1925 | } |
| 1926 | |
| 1927 | /* disconnect channel */ |
| 1928 | debug("session_exit_message: release channel %d", s->chanid); |
| 1929 | channel_cancel_cleanup(s->chanid); |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 1930 | /* |
| 1931 | * emulate a write failure with 'chan_write_failed', nobody will be |
| 1932 | * interested in data we write. |
| 1933 | * Note that we must not call 'chan_read_failed', since there could |
| 1934 | * be some more data waiting in the pipe. |
| 1935 | */ |
Damien Miller | bd483e7 | 2000-04-30 10:00:53 +1000 | [diff] [blame] | 1936 | if (c->ostate != CHAN_OUTPUT_CLOSED) |
| 1937 | chan_write_failed(c); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1938 | s->chanid = -1; |
| 1939 | } |
| 1940 | |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 1941 | void |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 1942 | session_close(Session *s) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1943 | { |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 1944 | debug("session_close: session %d pid %ld", s->self, (long)s->pid); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 1945 | if (s->ttyfd != -1) |
Ben Lindstrom | 7eaf8e4 | 2001-06-13 04:35:43 +0000 | [diff] [blame] | 1946 | session_pty_cleanup(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1947 | if (s->term) |
| 1948 | xfree(s->term); |
| 1949 | if (s->display) |
| 1950 | xfree(s->display); |
Damien Miller | 512bccb | 2002-02-05 12:11:02 +1100 | [diff] [blame] | 1951 | if (s->auth_display) |
| 1952 | xfree(s->auth_display); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1953 | if (s->auth_data) |
| 1954 | xfree(s->auth_data); |
| 1955 | if (s->auth_proto) |
| 1956 | xfree(s->auth_proto); |
| 1957 | s->used = 0; |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 1958 | session_proctitle(s); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1959 | } |
| 1960 | |
| 1961 | void |
| 1962 | session_close_by_pid(pid_t pid, int status) |
| 1963 | { |
| 1964 | Session *s = session_by_pid(pid); |
| 1965 | if (s == NULL) { |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 1966 | debug("session_close_by_pid: no session for pid %ld", |
| 1967 | (long)pid); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1968 | return; |
| 1969 | } |
| 1970 | if (s->chanid != -1) |
| 1971 | session_exit_message(s, status); |
| 1972 | session_close(s); |
| 1973 | } |
| 1974 | |
| 1975 | /* |
| 1976 | * this is called when a channel dies before |
| 1977 | * the session 'child' itself dies |
| 1978 | */ |
| 1979 | void |
| 1980 | session_close_by_channel(int id, void *arg) |
| 1981 | { |
| 1982 | Session *s = session_by_channel(id); |
| 1983 | if (s == NULL) { |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 1984 | debug("session_close_by_channel: no session for id %d", id); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 1985 | return; |
| 1986 | } |
Ben Lindstrom | ce0f634 | 2002-06-11 16:42:49 +0000 | [diff] [blame] | 1987 | debug("session_close_by_channel: channel %d child %ld", |
| 1988 | id, (long)s->pid); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 1989 | if (s->pid != 0) { |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 1990 | debug("session_close_by_channel: channel %d: has child", id); |
Damien Miller | 0585d51 | 2001-10-12 11:35:50 +1000 | [diff] [blame] | 1991 | /* |
| 1992 | * delay detach of session, but release pty, since |
| 1993 | * the fd's to the child are already closed |
| 1994 | */ |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 1995 | if (s->ttyfd != -1) |
Damien Miller | 0585d51 | 2001-10-12 11:35:50 +1000 | [diff] [blame] | 1996 | session_pty_cleanup(s); |
Damien Miller | 3ec2759 | 2001-10-12 11:35:04 +1000 | [diff] [blame] | 1997 | return; |
| 1998 | } |
| 1999 | /* detach by removing callback */ |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2000 | channel_cancel_cleanup(s->chanid); |
| 2001 | s->chanid = -1; |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 2002 | session_close(s); |
| 2003 | } |
| 2004 | |
| 2005 | void |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2006 | session_destroy_all(void (*closefunc)(Session *)) |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 2007 | { |
| 2008 | int i; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 2009 | for (i = 0; i < MAX_SESSIONS; i++) { |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 2010 | Session *s = &sessions[i]; |
Ben Lindstrom | 7a2073c | 2002-03-22 02:30:41 +0000 | [diff] [blame] | 2011 | if (s->used) { |
| 2012 | if (closefunc != NULL) |
| 2013 | closefunc(s); |
| 2014 | else |
| 2015 | session_close(s); |
| 2016 | } |
Damien Miller | 52b77be | 2001-10-10 15:14:37 +1000 | [diff] [blame] | 2017 | } |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2018 | } |
| 2019 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2020 | static char * |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2021 | session_tty_list(void) |
| 2022 | { |
| 2023 | static char buf[1024]; |
| 2024 | int i; |
Damien Miller | a8ed44b | 2003-01-10 09:53:12 +1100 | [diff] [blame] | 2025 | char *cp; |
| 2026 | |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2027 | buf[0] = '\0'; |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 2028 | for (i = 0; i < MAX_SESSIONS; i++) { |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2029 | Session *s = &sessions[i]; |
| 2030 | if (s->used && s->ttyfd != -1) { |
Damien Miller | a8ed44b | 2003-01-10 09:53:12 +1100 | [diff] [blame] | 2031 | |
| 2032 | if (strncmp(s->tty, "/dev/", 5) != 0) { |
| 2033 | cp = strrchr(s->tty, '/'); |
| 2034 | cp = (cp == NULL) ? s->tty : cp + 1; |
| 2035 | } else |
| 2036 | cp = s->tty + 5; |
| 2037 | |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2038 | if (buf[0] != '\0') |
| 2039 | strlcat(buf, ",", sizeof buf); |
Damien Miller | a8ed44b | 2003-01-10 09:53:12 +1100 | [diff] [blame] | 2040 | strlcat(buf, cp, sizeof buf); |
Damien Miller | e247cc4 | 2000-05-07 12:03:14 +1000 | [diff] [blame] | 2041 | } |
| 2042 | } |
| 2043 | if (buf[0] == '\0') |
| 2044 | strlcpy(buf, "notty", sizeof buf); |
| 2045 | return buf; |
| 2046 | } |
| 2047 | |
| 2048 | void |
| 2049 | session_proctitle(Session *s) |
| 2050 | { |
| 2051 | if (s->pw == NULL) |
| 2052 | error("no user for session %d", s->self); |
| 2053 | else |
| 2054 | setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); |
| 2055 | } |
| 2056 | |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2057 | int |
| 2058 | session_setup_x11fwd(Session *s) |
| 2059 | { |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2060 | struct stat st; |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2061 | char display[512], auth_display[512]; |
| 2062 | char hostname[MAXHOSTNAMELEN]; |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2063 | |
| 2064 | if (no_x11_forwarding_flag) { |
| 2065 | packet_send_debug("X11 forwarding disabled in user configuration file."); |
| 2066 | return 0; |
| 2067 | } |
| 2068 | if (!options.x11_forwarding) { |
| 2069 | debug("X11 forwarding disabled in server configuration file."); |
| 2070 | return 0; |
| 2071 | } |
| 2072 | if (!options.xauth_location || |
| 2073 | (stat(options.xauth_location, &st) == -1)) { |
| 2074 | packet_send_debug("No xauth program; cannot forward with spoofing."); |
| 2075 | return 0; |
| 2076 | } |
Ben Lindstrom | 699776e | 2001-06-21 03:14:49 +0000 | [diff] [blame] | 2077 | if (options.use_login) { |
| 2078 | packet_send_debug("X11 forwarding disabled; " |
| 2079 | "not compatible with UseLogin=yes."); |
| 2080 | return 0; |
| 2081 | } |
Ben Lindstrom | 2bcdf06 | 2001-06-13 04:41:41 +0000 | [diff] [blame] | 2082 | if (s->display != NULL) { |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2083 | debug("X11 display already set."); |
| 2084 | return 0; |
| 2085 | } |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2086 | if (x11_create_display_inet(options.x11_display_offset, |
| 2087 | options.x11_use_localhost, s->single_connection, |
| 2088 | &s->display_number) == -1) { |
Ben Lindstrom | 2bcdf06 | 2001-06-13 04:41:41 +0000 | [diff] [blame] | 2089 | debug("x11_create_display_inet failed."); |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2090 | return 0; |
| 2091 | } |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2092 | |
| 2093 | /* Set up a suitable value for the DISPLAY variable. */ |
| 2094 | if (gethostname(hostname, sizeof(hostname)) < 0) |
| 2095 | fatal("gethostname: %.100s", strerror(errno)); |
| 2096 | /* |
| 2097 | * auth_display must be used as the displayname when the |
| 2098 | * authorization entry is added with xauth(1). This will be |
| 2099 | * different than the DISPLAY string for localhost displays. |
| 2100 | */ |
Damien Miller | 95c249f | 2002-02-05 12:11:34 +1100 | [diff] [blame] | 2101 | if (options.x11_use_localhost) { |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2102 | snprintf(display, sizeof display, "localhost:%u.%u", |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2103 | s->display_number, s->screen); |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2104 | snprintf(auth_display, sizeof auth_display, "unix:%u.%u", |
Damien Miller | 512bccb | 2002-02-05 12:11:02 +1100 | [diff] [blame] | 2105 | s->display_number, s->screen); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2106 | s->display = xstrdup(display); |
Damien Miller | 512bccb | 2002-02-05 12:11:02 +1100 | [diff] [blame] | 2107 | s->auth_display = xstrdup(auth_display); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2108 | } else { |
| 2109 | #ifdef IPADDR_IN_DISPLAY |
| 2110 | struct hostent *he; |
| 2111 | struct in_addr my_addr; |
| 2112 | |
| 2113 | he = gethostbyname(hostname); |
| 2114 | if (he == NULL) { |
| 2115 | error("Can't get IP address for X11 DISPLAY."); |
| 2116 | packet_send_debug("Can't get IP address for X11 DISPLAY."); |
| 2117 | return 0; |
| 2118 | } |
| 2119 | memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr)); |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2120 | snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr), |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2121 | s->display_number, s->screen); |
| 2122 | #else |
Ben Lindstrom | a9d2c89 | 2002-06-23 21:48:28 +0000 | [diff] [blame] | 2123 | snprintf(display, sizeof display, "%.400s:%u.%u", hostname, |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2124 | s->display_number, s->screen); |
| 2125 | #endif |
| 2126 | s->display = xstrdup(display); |
Damien Miller | 512bccb | 2002-02-05 12:11:02 +1100 | [diff] [blame] | 2127 | s->auth_display = xstrdup(display); |
Kevin Steves | 366298c | 2001-12-19 17:58:01 +0000 | [diff] [blame] | 2128 | } |
| 2129 | |
Ben Lindstrom | 768176b | 2001-06-09 01:29:12 +0000 | [diff] [blame] | 2130 | return 1; |
| 2131 | } |
| 2132 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 2133 | static void |
Ben Lindstrom | db65e8f | 2001-01-19 04:26:52 +0000 | [diff] [blame] | 2134 | do_authenticated2(Authctxt *authctxt) |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2135 | { |
Ben Lindstrom | bddd551 | 2001-07-04 04:53:53 +0000 | [diff] [blame] | 2136 | server_loop2(authctxt); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2137 | } |
| 2138 | |
| 2139 | void |
| 2140 | do_cleanup(Authctxt *authctxt) |
| 2141 | { |
| 2142 | static int called = 0; |
| 2143 | |
| 2144 | debug("do_cleanup"); |
| 2145 | |
| 2146 | /* no cleanup if we're in the child for login shell */ |
| 2147 | if (is_child) |
| 2148 | return; |
| 2149 | |
| 2150 | /* avoid double cleanup */ |
| 2151 | if (called) |
| 2152 | return; |
| 2153 | called = 1; |
| 2154 | |
| 2155 | if (authctxt == NULL) |
| 2156 | return; |
| 2157 | #ifdef KRB5 |
| 2158 | if (options.kerberos_ticket_cleanup && |
| 2159 | authctxt->krb5_ctx) |
| 2160 | krb5_cleanup_proc(authctxt); |
Darren Tucker | 0efd155 | 2003-08-26 11:49:55 +1000 | [diff] [blame] | 2161 | #endif |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2162 | |
| 2163 | #ifdef GSSAPI |
| 2164 | if (compat20 && options.gss_cleanup_creds) |
| 2165 | ssh_gssapi_cleanup_creds(); |
| 2166 | #endif |
| 2167 | |
Darren Tucker | 8846a07 | 2003-10-07 11:30:15 +1000 | [diff] [blame] | 2168 | #ifdef USE_PAM |
| 2169 | if (options.use_pam) { |
| 2170 | sshpam_cleanup(); |
| 2171 | sshpam_thread_cleanup(); |
| 2172 | } |
| 2173 | #endif |
| 2174 | |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 2175 | /* remove agent socket */ |
| 2176 | auth_sock_cleanup_proc(authctxt->pw); |
| 2177 | |
| 2178 | /* |
| 2179 | * Cleanup ptys/utmp only if privsep is disabled, |
| 2180 | * or if running in monitor. |
| 2181 | */ |
| 2182 | if (!use_privsep || mm_is_monitor()) |
| 2183 | session_destroy_all(session_pty_cleanup2); |
Damien Miller | efb4afe | 2000-04-12 18:45:05 +1000 | [diff] [blame] | 2184 | } |