+/* $OpenBSD: session.c,v 1.241 2008/06/16 13:22:53 dtucker Exp $ */
/*
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
*/
#include "includes.h"
-RCSID("$OpenBSD: session.c,v 1.108 2001/10/11 13:45:21 markus Exp $");
+#include <sys/types.h>
+#include <sys/param.h>
+#ifdef HAVE_SYS_STAT_H
+# include <sys/stat.h>
+#endif
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/wait.h>
+
+#include <arpa/inet.h>
+
+#include <errno.h>
+#include <grp.h>
+#ifdef HAVE_PATHS_H
+#include <paths.h>
+#endif
+#include <pwd.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "openbsd-compat/sys-queue.h"
+#include "xmalloc.h"
#include "ssh.h"
#include "ssh1.h"
#include "ssh2.h"
-#include "xmalloc.h"
#include "sshpty.h"
#include "packet.h"
#include "buffer.h"
-#include "mpaux.h"
+#include "match.h"
#include "uidswap.h"
#include "compat.h"
#include "channels.h"
-#include "bufaux.h"
+#include "key.h"
+#include "cipher.h"
+#ifdef GSSAPI
+#include "ssh-gss.h"
+#endif
+#include "hostfile.h"
#include "auth.h"
#include "auth-options.h"
#include "pathnames.h"
#include "sshlogin.h"
#include "serverloop.h"
#include "canohost.h"
+#include "misc.h"
#include "session.h"
+#include "kex.h"
+#include "monitor_wrap.h"
+#include "sftp.h"
-#ifdef WITH_IRIX_PROJECT
-#include <proj.h>
-#endif /* WITH_IRIX_PROJECT */
-#ifdef WITH_IRIX_JOBS
-#include <sys/resource.h>
-#endif
-#ifdef WITH_IRIX_AUDIT
-#include <sat.h>
-#endif /* WITH_IRIX_AUDIT */
-
-#if defined(HAVE_USERSEC_H)
-#include <usersec.h>
-#endif
-
-#ifdef HAVE_CYGWIN
-#include <windows.h>
-#include <sys/cygwin.h>
-#define is_winnt (GetVersion() < 0x80000000)
-#endif
-
-/* AIX limits */
-#if defined(HAVE_GETUSERATTR) && !defined(S_UFSIZE_HARD) && defined(S_UFSIZE)
-# define S_UFSIZE_HARD S_UFSIZE "_hard"
-# define S_UCPU_HARD S_UCPU "_hard"
-# define S_UDATA_HARD S_UDATA "_hard"
-# define S_USTACK_HARD S_USTACK "_hard"
-# define S_URSS_HARD S_URSS "_hard"
-# define S_UCORE_HARD S_UCORE "_hard"
-# define S_UNOFILE_HARD S_UNOFILE "_hard"
-#endif
-
-#ifdef _AIX
-# include <uinfo.h>
+#if defined(KRB5) && defined(USE_AFS)
+#include <kafs.h>
#endif
-/* types */
-
-#define TTYSZ 64
-typedef struct Session Session;
-struct Session {
- int used;
- int self;
- struct passwd *pw;
- Authctxt *authctxt;
- pid_t pid;
- /* tty */
- char *term;
- int ptyfd, ttyfd, ptymaster;
- int row, col, xpixel, ypixel;
- char tty[TTYSZ];
- /* X11 */
- char *display;
- int screen;
- char *auth_proto;
- char *auth_data;
- int single_connection;
- /* proto 2 */
- int chanid;
- int is_subsystem;
-};
-
/* func */
Session *session_new(void);
-void session_set_fds(Session *, int, int, int);
-static void session_pty_cleanup(void *);
+void session_set_fds(Session *, int, int, int, int);
+void session_pty_cleanup(Session *);
void session_proctitle(Session *);
int session_setup_x11fwd(Session *);
-void do_exec_pty(Session *, const char *);
-void do_exec_no_pty(Session *, const char *);
-void do_exec(Session *, const char *);
+int do_exec_pty(Session *, const char *);
+int do_exec_no_pty(Session *, const char *);
+int do_exec(Session *, const char *);
void do_login(Session *, const char *);
#ifdef LOGIN_NEEDS_UTMPX
static void do_pre_login(Session *s);
static void do_authenticated1(Authctxt *);
static void do_authenticated2(Authctxt *);
-static void session_close(Session *);
static int session_pty_req(Session *);
/* import */
extern u_int utmp_len;
extern int startup_pipe;
extern void destroy_sensitive_data(void);
+extern Buffer loginmsg;
/* original command from peer. */
const char *original_command = NULL;
/* data */
-#define MAX_SESSIONS 10
-Session sessions[MAX_SESSIONS];
+static int sessions_first_unused = -1;
+static int sessions_nalloc = 0;
+static Session *sessions = NULL;
-#ifdef WITH_AIXAUTHENTICATE
-char *aixloginmsg;
-#endif /* WITH_AIXAUTHENTICATE */
+#define SUBSYSTEM_NONE 0
+#define SUBSYSTEM_EXT 1
+#define SUBSYSTEM_INT_SFTP 2
#ifdef HAVE_LOGIN_CAP
-static login_cap_t *lc;
+login_cap_t *lc;
#endif
-void
-do_authenticated(Authctxt *authctxt)
+static int is_child = 0;
+
+/* Name and directory of socket for authentication agent forwarding. */
+static char *auth_sock_name = NULL;
+static char *auth_sock_dir = NULL;
+
+/* removes the agent forwarding socket */
+
+static void
+auth_sock_cleanup_proc(struct passwd *pw)
{
- /*
- * Cancel the alarm we set to limit the time taken for
- * authentication.
- */
- alarm(0);
- if (startup_pipe != -1) {
- close(startup_pipe);
- startup_pipe = -1;
- }
-#if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD)
- if ((lc = login_getclass(authctxt->pw->pw_class)) == NULL) {
- error("unable to get login class");
- return;
+ if (auth_sock_name != NULL) {
+ temporarily_use_uid(pw);
+ unlink(auth_sock_name);
+ rmdir(auth_sock_dir);
+ auth_sock_name = NULL;
+ restore_uid();
+ }
+}
+
+static int
+auth_input_request_forwarding(struct passwd * pw)
+{
+ Channel *nc;
+ int sock = -1;
+ struct sockaddr_un sunaddr;
+
+ if (auth_sock_name != NULL) {
+ error("authentication forwarding requested twice.");
+ return 0;
}
-#ifdef BSD_AUTH
- if (auth_approval(NULL, lc, authctxt->pw->pw_name, "ssh") <= 0) {
- packet_disconnect("Approval failure for %s",
- authctxt->pw->pw_name);
+
+ /* Temporarily drop privileged uid for mkdir/bind. */
+ temporarily_use_uid(pw);
+
+ /* Allocate a buffer for the socket name, and format the name. */
+ auth_sock_dir = xstrdup("/tmp/ssh-XXXXXXXXXX");
+
+ /* Create private directory for socket */
+ if (mkdtemp(auth_sock_dir) == NULL) {
+ packet_send_debug("Agent forwarding disabled: "
+ "mkdtemp() failed: %.100s", strerror(errno));
+ restore_uid();
+ xfree(auth_sock_dir);
+ auth_sock_dir = NULL;
+ goto authsock_err;
+ }
+
+ xasprintf(&auth_sock_name, "%s/agent.%ld",
+ auth_sock_dir, (long) getpid());
+
+ /* Create the socket. */
+ sock = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (sock < 0) {
+ error("socket: %.100s", strerror(errno));
+ restore_uid();
+ goto authsock_err;
+ }
+
+ /* Bind it to the name. */
+ memset(&sunaddr, 0, sizeof(sunaddr));
+ sunaddr.sun_family = AF_UNIX;
+ strlcpy(sunaddr.sun_path, auth_sock_name, sizeof(sunaddr.sun_path));
+
+ if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0) {
+ error("bind: %.100s", strerror(errno));
+ restore_uid();
+ goto authsock_err;
+ }
+
+ /* Restore the privileged uid. */
+ restore_uid();
+
+ /* Start listening on the socket. */
+ if (listen(sock, SSH_LISTEN_BACKLOG) < 0) {
+ error("listen: %.100s", strerror(errno));
+ goto authsock_err;
}
-#endif
-#endif
-#ifdef WITH_AIXAUTHENTICATE
- /* We don't have a pty yet, so just label the line as "ssh" */
- if (loginsuccess(authctxt->user,
- get_canonical_hostname(options.reverse_mapping_check),
- "ssh", &aixloginmsg) < 0)
- aixloginmsg = NULL;
-#endif /* WITH_AIXAUTHENTICATE */
+
+ /* Allocate a channel for the authentication agent socket. */
+ nc = channel_new("auth socket",
+ SSH_CHANNEL_AUTH_SOCKET, sock, sock, -1,
+ CHAN_X11_WINDOW_DEFAULT, CHAN_X11_PACKET_DEFAULT,
+ 0, "auth socket", 1);
+ strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
+ return 1;
+
+ authsock_err:
+ if (auth_sock_name != NULL)
+ xfree(auth_sock_name);
+ if (auth_sock_dir != NULL) {
+ rmdir(auth_sock_dir);
+ xfree(auth_sock_dir);
+ }
+ if (sock != -1)
+ close(sock);
+ auth_sock_name = NULL;
+ auth_sock_dir = NULL;
+ return 0;
+}
+
+static void
+display_loginmsg(void)
+{
+ if (buffer_len(&loginmsg) > 0) {
+ buffer_append(&loginmsg, "\0", 1);
+ printf("%s", (char *)buffer_ptr(&loginmsg));
+ buffer_clear(&loginmsg);
+ }
+}
+
+void
+do_authenticated(Authctxt *authctxt)
+{
+ setproctitle("%s", authctxt->pw->pw_name);
/* setup the channel layer */
if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
else
do_authenticated1(authctxt);
- /* remove agent socket */
- if (auth_get_socket_name())
- auth_sock_cleanup_proc(authctxt->pw);
-#ifdef KRB4
- if (options.kerberos_ticket_cleanup)
- krb4_cleanup_proc(authctxt);
-#endif
-#ifdef KRB5
- if (options.kerberos_ticket_cleanup)
- krb5_cleanup_proc(authctxt);
-#endif
+ do_cleanup(authctxt);
}
/*
{
Session *s;
char *command;
- int success, type, plen, screen_flag;
- int compression_level = 0, enable_compression_after_reply = 0;
- u_int proto_len, data_len, dlen;
+ int success, type, screen_flag;
+ int enable_compression_after_reply = 0;
+ u_int proto_len, data_len, dlen, compression_level = 0;
s = session_new();
+ if (s == NULL) {
+ error("no more sessions");
+ return;
+ }
s->authctxt = authctxt;
s->pw = authctxt->pw;
success = 0;
/* Get a packet from the client. */
- type = packet_read(&plen);
+ type = packet_read();
/* Process the packet. */
switch (type) {
case SSH_CMSG_REQUEST_COMPRESSION:
- packet_integrity_check(plen, 4, type);
compression_level = packet_get_int();
+ packet_check_eom();
if (compression_level < 1 || compression_level > 9) {
- packet_send_debug("Received illegal compression level %d.",
- compression_level);
+ packet_send_debug("Received invalid compression level %d.",
+ compression_level);
+ break;
+ }
+ if (options.compression == COMP_NONE) {
+ debug2("compression disabled");
break;
}
/* Enable compression after we have responded with SUCCESS. */
} else {
s->screen = 0;
}
- packet_done();
+ packet_check_eom();
success = session_setup_x11fwd(s);
if (!success) {
xfree(s->auth_proto);
break;
case SSH_CMSG_AGENT_REQUEST_FORWARDING:
- if (no_agent_forwarding_flag || compat13) {
+ if (!options.allow_agent_forwarding ||
+ no_agent_forwarding_flag || compat13) {
debug("Authentication agent forwarding not permitted for this authentication.");
break;
}
break;
}
debug("Received TCP/IP port forwarding request.");
- channel_input_port_forward_request(s->pw->pw_uid == 0, options.gateway_ports);
+ if (channel_input_port_forward_request(s->pw->pw_uid == 0,
+ options.gateway_ports) < 0) {
+ debug("Port forwarding failed.");
+ break;
+ }
success = 1;
break;
if (packet_set_maxsize(packet_get_int()) > 0)
success = 1;
break;
-
-#if defined(AFS) || defined(KRB5)
- case SSH_CMSG_HAVE_KERBEROS_TGT:
- if (!options.kerberos_tgt_passing) {
- verbose("Kerberos TGT passing disabled.");
- } else {
- char *kdata = packet_get_string(&dlen);
- packet_integrity_check(plen, 4 + dlen, type);
-
- /* XXX - 0x41, see creds_to_radix version */
- if (kdata[0] != 0x41) {
-#ifdef KRB5
- krb5_data tgt;
- tgt.data = kdata;
- tgt.length = dlen;
-
- if (auth_krb5_tgt(s->authctxt, &tgt))
- success = 1;
- else
- verbose("Kerberos v5 TGT refused for %.100s", s->authctxt->user);
-#endif /* KRB5 */
- } else {
-#ifdef AFS
- if (auth_krb4_tgt(s->authctxt, kdata))
- success = 1;
- else
- verbose("Kerberos v4 TGT refused for %.100s", s->authctxt->user);
-#endif /* AFS */
- }
- xfree(kdata);
- }
- break;
-#endif /* AFS || KRB5 */
-
-#ifdef AFS
- case SSH_CMSG_HAVE_AFS_TOKEN:
- if (!options.afs_token_passing || !k_hasafs()) {
- verbose("AFS token passing disabled.");
- } else {
- /* Accept AFS token. */
- char *token = packet_get_string(&dlen);
- packet_integrity_check(plen, 4 + dlen, type);
-
- if (auth_afs_token(s->authctxt, token))
- success = 1;
- else
- verbose("AFS token refused for %.100s",
- s->authctxt->user);
- xfree(token);
- }
- break;
-#endif /* AFS */
case SSH_CMSG_EXEC_SHELL:
case SSH_CMSG_EXEC_CMD:
if (type == SSH_CMSG_EXEC_CMD) {
command = packet_get_string(&dlen);
debug("Exec command '%.500s'", command);
- do_exec(s, command);
+ if (do_exec(s, command) != 0)
+ packet_disconnect(
+ "command execution failed");
xfree(command);
} else {
- do_exec(s, NULL);
+ if (do_exec(s, NULL) != 0)
+ packet_disconnect(
+ "shell execution failed");
}
- packet_done();
+ packet_check_eom();
session_close(s);
return;
* Any unknown messages in this phase are ignored,
* and a failure message is returned.
*/
- log("Unknown packet type received after authentication: %d", type);
+ logit("Unknown packet type received after authentication: %d", type);
}
packet_start(success ? SSH_SMSG_SUCCESS : SSH_SMSG_FAILURE);
packet_send();
}
}
+#define USE_PIPES
/*
* This is called to fork and execute a command when we have no tty. This
* will call do_child from the child, and server_loop from the parent after
* setting up file descriptors and such.
*/
-void
+int
do_exec_no_pty(Session *s, const char *command)
{
- int pid;
+ pid_t pid;
#ifdef USE_PIPES
int pin[2], pout[2], perr[2];
+
/* Allocate pipes for communicating with the program. */
- if (pipe(pin) < 0 || pipe(pout) < 0 || pipe(perr) < 0)
- packet_disconnect("Could not create pipes: %.100s",
- strerror(errno));
-#else /* USE_PIPES */
+ if (pipe(pin) < 0) {
+ error("%s: pipe in: %.100s", __func__, strerror(errno));
+ return -1;
+ }
+ if (pipe(pout) < 0) {
+ error("%s: pipe out: %.100s", __func__, strerror(errno));
+ close(pin[0]);
+ close(pin[1]);
+ return -1;
+ }
+ if (pipe(perr) < 0) {
+ error("%s: pipe err: %.100s", __func__, strerror(errno));
+ close(pin[0]);
+ close(pin[1]);
+ close(pout[0]);
+ close(pout[1]);
+ return -1;
+ }
+#else
int inout[2], err[2];
+
/* Uses socket pairs to communicate with the program. */
- if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0 ||
- socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0)
- packet_disconnect("Could not create socket pairs: %.100s",
- strerror(errno));
-#endif /* USE_PIPES */
+ if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) < 0) {
+ error("%s: socketpair #1: %.100s", __func__, strerror(errno));
+ return -1;
+ }
+ if (socketpair(AF_UNIX, SOCK_STREAM, 0, err) < 0) {
+ error("%s: socketpair #2: %.100s", __func__, strerror(errno));
+ close(inout[0]);
+ close(inout[1]);
+ return -1;
+ }
+#endif
+
if (s == NULL)
fatal("do_exec_no_pty: no session");
session_proctitle(s);
-#if defined(USE_PAM)
- do_pam_session(s->pw->pw_name, NULL);
- do_pam_setcred(1);
- if (is_pam_password_change_required())
- packet_disconnect("Password change required but no "
- "TTY available");
-#endif /* USE_PAM */
-
/* Fork the child. */
- if ((pid = fork()) == 0) {
+ switch ((pid = fork())) {
+ case -1:
+ error("%s: fork: %.100s", __func__, strerror(errno));
+#ifdef USE_PIPES
+ close(pin[0]);
+ close(pin[1]);
+ close(pout[0]);
+ close(pout[1]);
+ close(perr[0]);
+ close(perr[1]);
+#else
+ close(inout[0]);
+ close(inout[1]);
+ close(err[0]);
+ close(err[1]);
+#endif
+ return -1;
+ case 0:
+ is_child = 1;
+
/* Child. Reinitialize the log since the pid has changed. */
- log_init(__progname, options.log_level, options.log_facility, log_stderr);
+ log_init(__progname, options.log_level,
+ options.log_facility, log_stderr);
/*
* Create a new session and process group since the 4.4BSD
if (dup2(perr[1], 2) < 0)
perror("dup2 stderr");
close(perr[1]);
-#else /* USE_PIPES */
+#else
/*
* Redirect stdin, stdout, and stderr. Stdin and stdout will
* use the same socket, as some programs (particularly rdist)
close(err[1]);
if (dup2(inout[0], 0) < 0) /* stdin */
perror("dup2 stdin");
- if (dup2(inout[0], 1) < 0) /* stdout. Note: same socket as stdin. */
+ if (dup2(inout[0], 1) < 0) /* stdout (same as stdin) */
perror("dup2 stdout");
+ close(inout[0]);
if (dup2(err[0], 2) < 0) /* stderr */
perror("dup2 stderr");
-#endif /* USE_PIPES */
+ close(err[0]);
+#endif
+
+
+#ifdef _UNICOS
+ cray_init_job(s->pw); /* set up cray jid and tmpdir */
+#endif
/* Do processing for the child (exec command etc). */
do_child(s, command);
/* NOTREACHED */
+ default:
+ break;
}
+
+#ifdef _UNICOS
+ signal(WJSIGNAL, cray_job_termination_handler);
+#endif /* _UNICOS */
#ifdef HAVE_CYGWIN
if (is_winnt)
cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
#endif
- if (pid < 0)
- packet_disconnect("fork failed: %.100s", strerror(errno));
+
s->pid = pid;
/* Set interactive/non-interactive mode. */
packet_set_interactive(s->display != NULL);
+
+ /*
+ * Clear loginmsg, since it's the child's responsibility to display
+ * it to the user, otherwise multiple sessions may accumulate
+ * multiple copies of the login messages.
+ */
+ buffer_clear(&loginmsg);
+
#ifdef USE_PIPES
/* We are the parent. Close the child sides of the pipes. */
close(pin[0]);
close(perr[1]);
if (compat20) {
- session_set_fds(s, pin[1], pout[0], s->is_subsystem ? -1 : perr[0]);
+ if (s->is_subsystem) {
+ close(perr[0]);
+ perr[0] = -1;
+ }
+ session_set_fds(s, pin[1], pout[0], perr[0], 0);
} else {
/* Enter the interactive session. */
server_loop(pid, pin[1], pout[0], perr[0]);
/* server_loop has closed pin[1], pout[0], and perr[0]. */
}
-#else /* USE_PIPES */
+#else
/* We are the parent. Close the child sides of the socket pairs. */
close(inout[0]);
close(err[0]);
* handle the case that fdin and fdout are the same.
*/
if (compat20) {
- session_set_fds(s, inout[1], inout[1], s->is_subsystem ? -1 : err[1]);
+ session_set_fds(s, inout[1], inout[1],
+ s->is_subsystem ? -1 : err[1], 0);
+ if (s->is_subsystem)
+ close(err[1]);
} else {
server_loop(pid, inout[1], inout[1], err[1]);
/* server_loop has closed inout[1] and err[1]. */
}
-#endif /* USE_PIPES */
+#endif
+ return 0;
}
/*
* setting up file descriptors, controlling tty, updating wtmp, utmp,
* lastlog, and other such operations.
*/
-void
+int
do_exec_pty(Session *s, const char *command)
{
int fdout, ptyfd, ttyfd, ptymaster;
ptyfd = s->ptyfd;
ttyfd = s->ttyfd;
-#if defined(USE_PAM)
- do_pam_session(s->pw->pw_name, s->tty);
- do_pam_setcred(1);
-#endif
+ /*
+ * Create another descriptor of the pty master side for use as the
+ * standard input. We could use the original descriptor, but this
+ * simplifies code in server_loop. The descriptor is bidirectional.
+ * Do this before forking (and cleanup in the child) so as to
+ * detect and gracefully fail out-of-fd conditions.
+ */
+ if ((fdout = dup(ptyfd)) < 0) {
+ error("%s: dup #1: %s", __func__, strerror(errno));
+ close(ttyfd);
+ close(ptyfd);
+ return -1;
+ }
+ /* we keep a reference to the pty master */
+ if ((ptymaster = dup(ptyfd)) < 0) {
+ error("%s: dup #2: %s", __func__, strerror(errno));
+ close(ttyfd);
+ close(ptyfd);
+ close(fdout);
+ return -1;
+ }
/* Fork the child. */
- if ((pid = fork()) == 0) {
+ switch ((pid = fork())) {
+ case -1:
+ error("%s: fork: %.100s", __func__, strerror(errno));
+ close(fdout);
+ close(ptymaster);
+ close(ttyfd);
+ close(ptyfd);
+ return -1;
+ case 0:
+ is_child = 1;
+
+ close(fdout);
+ close(ptymaster);
/* Child. Reinitialize the log because the pid has changed. */
- log_init(__progname, options.log_level, options.log_facility, log_stderr);
+ log_init(__progname, options.log_level,
+ options.log_facility, log_stderr);
/* Close the master side of the pseudo tty. */
close(ptyfd);
/* record login, etc. similar to login(1) */
#ifndef HAVE_OSF_SIA
- if (!(options.use_login && command == NULL))
+ if (!(options.use_login && command == NULL)) {
+#ifdef _UNICOS
+ cray_init_job(s->pw); /* set up cray jid and tmpdir */
+#endif /* _UNICOS */
do_login(s, command);
+ }
# ifdef LOGIN_NEEDS_UTMPX
else
do_pre_login(s);
# endif
#endif
-
- /* Do common processing for the child, such as execing the command. */
- do_child(s, command);
- /* NOTREACHED */
+ /*
+ * Do common processing for the child, such as execing
+ * the command.
+ */
+ do_child(s, command);
+ /* NOTREACHED */
+ default:
+ break;
}
+
+#ifdef _UNICOS
+ signal(WJSIGNAL, cray_job_termination_handler);
+#endif /* _UNICOS */
#ifdef HAVE_CYGWIN
if (is_winnt)
cygwin_set_impersonation_token(INVALID_HANDLE_VALUE);
#endif
- if (pid < 0)
- packet_disconnect("fork failed: %.100s", strerror(errno));
+
s->pid = pid;
/* Parent. Close the slave side of the pseudo tty. */
close(ttyfd);
- /*
- * Create another descriptor of the pty master side for use as the
- * standard input. We could use the original descriptor, but this
- * simplifies code in server_loop. The descriptor is bidirectional.
- */
- fdout = dup(ptyfd);
- if (fdout < 0)
- packet_disconnect("dup #1 failed: %.100s", strerror(errno));
-
- /* we keep a reference to the pty master */
- ptymaster = dup(ptyfd);
- if (ptymaster < 0)
- packet_disconnect("dup #2 failed: %.100s", strerror(errno));
- s->ptymaster = ptymaster;
-
/* Enter interactive session. */
+ s->ptymaster = ptymaster;
packet_set_interactive(1);
if (compat20) {
- session_set_fds(s, ptyfd, fdout, -1);
+ session_set_fds(s, ptyfd, fdout, -1, 1);
} else {
server_loop(pid, ptyfd, fdout, -1);
/* server_loop _has_ closed ptyfd and fdout. */
}
+ return 0;
}
#ifdef LOGIN_NEEDS_UTMPX
* the address be 0.0.0.0.
*/
memset(&from, 0, sizeof(from));
+ fromlen = sizeof(from);
if (packet_connection_is_on_socket()) {
- fromlen = sizeof(from);
if (getpeername(packet_get_connection_in(),
- (struct sockaddr *) & from, &fromlen) < 0) {
+ (struct sockaddr *)&from, &fromlen) < 0) {
debug("getpeername: %.100s", strerror(errno));
- fatal_cleanup();
+ cleanup_exit(255);
}
}
record_utmp_only(pid, s->tty, s->pw->pw_name,
- get_remote_name_or_ip(utmp_len, options.reverse_mapping_check),
- (struct sockaddr *)&from);
+ get_remote_name_or_ip(utmp_len, options.use_dns),
+ (struct sockaddr *)&from, fromlen);
}
#endif
* This is called to fork and execute a command. If another command is
* to be forced, execute that instead.
*/
-void
+int
do_exec(Session *s, const char *command)
{
- if (forced_command) {
+ int ret;
+
+ if (options.adm_forced_command) {
+ original_command = command;
+ command = options.adm_forced_command;
+ if (strcmp(INTERNAL_SFTP_NAME, command) == 0)
+ s->is_subsystem = SUBSYSTEM_INT_SFTP;
+ else if (s->is_subsystem)
+ s->is_subsystem = SUBSYSTEM_EXT;
+ debug("Forced command (config) '%.900s'", command);
+ } else if (forced_command) {
original_command = command;
command = forced_command;
- debug("Forced command '%.900s'", command);
+ if (strcmp(INTERNAL_SFTP_NAME, command) == 0)
+ s->is_subsystem = SUBSYSTEM_INT_SFTP;
+ else if (s->is_subsystem)
+ s->is_subsystem = SUBSYSTEM_EXT;
+ debug("Forced command (key option) '%.900s'", command);
}
+#ifdef SSH_AUDIT_EVENTS
+ if (command != NULL)
+ PRIVSEP(audit_run_command(command));
+ else if (s->ttyfd == -1) {
+ char *shell = s->pw->pw_shell;
+
+ if (shell[0] == '\0') /* empty shell means /bin/sh */
+ shell =_PATH_BSHELL;
+ PRIVSEP(audit_run_command(shell));
+ }
+#endif
if (s->ttyfd != -1)
- do_exec_pty(s, command);
+ ret = do_exec_pty(s, command);
else
- do_exec_no_pty(s, command);
+ ret = do_exec_no_pty(s, command);
original_command = NULL;
+
+ /*
+ * Clear loginmsg: it's the child's responsibility to display
+ * it to the user, otherwise multiple sessions may accumulate
+ * multiple copies of the login messages.
+ */
+ buffer_clear(&loginmsg);
+
+ return ret;
}
/* administrative, login(1)-like work */
void
do_login(Session *s, const char *command)
{
- char *time_string;
- char hostname[MAXHOSTNAMELEN];
socklen_t fromlen;
struct sockaddr_storage from;
- time_t last_login_time;
struct passwd * pw = s->pw;
pid_t pid = getpid();
* the address be 0.0.0.0.
*/
memset(&from, 0, sizeof(from));
+ fromlen = sizeof(from);
if (packet_connection_is_on_socket()) {
- fromlen = sizeof(from);
if (getpeername(packet_get_connection_in(),
- (struct sockaddr *) & from, &fromlen) < 0) {
+ (struct sockaddr *) & from, &fromlen) < 0) {
debug("getpeername: %.100s", strerror(errno));
- fatal_cleanup();
+ cleanup_exit(255);
}
}
- /* Get the time and hostname when the user last logged in. */
- if (options.print_lastlog) {
- hostname[0] = '\0';
- last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name,
- hostname, sizeof(hostname));
- }
-
/* Record that there was a login on that tty from the remote host. */
- record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
- get_remote_name_or_ip(utmp_len, options.reverse_mapping_check),
- (struct sockaddr *)&from);
+ if (!use_privsep)
+ record_login(pid, s->tty, pw->pw_name, pw->pw_uid,
+ get_remote_name_or_ip(utmp_len,
+ options.use_dns),
+ (struct sockaddr *)&from, fromlen);
#ifdef USE_PAM
/*
* If password change is needed, do it now.
* This needs to occur before the ~/.hushlogin check.
*/
- if (is_pam_password_change_required()) {
- print_pam_messages();
+ if (options.use_pam && !use_privsep && s->authctxt->force_pwchange) {
+ display_loginmsg();
do_pam_chauthtok();
+ s->authctxt->force_pwchange = 0;
+ /* XXX - signal [net] parent to enable forwardings */
}
#endif
if (check_quietlogin(s, command))
return;
-#ifdef USE_PAM
- if (!is_pam_password_change_required())
- print_pam_messages();
-#endif /* USE_PAM */
-#ifdef WITH_AIXAUTHENTICATE
- if (aixloginmsg && *aixloginmsg)
- printf("%s\n", aixloginmsg);
-#endif /* WITH_AIXAUTHENTICATE */
-
- if (options.print_lastlog && last_login_time != 0) {
- time_string = ctime(&last_login_time);
- if (strchr(time_string, '\n'))
- *strchr(time_string, '\n') = 0;
- if (strcmp(hostname, "") == 0)
- printf("Last login: %s\r\n", time_string);
- else
- printf("Last login: %s from %s\r\n", time_string, hostname);
- }
+ display_loginmsg();
do_motd();
}
* Sets the value of the given variable in the environment. If the variable
* already exists, its value is overriden.
*/
-static void
+void
child_set_env(char ***envp, u_int *envsizep, const char *name,
- const char *value)
+ const char *value)
{
- u_int i, namelen;
char **env;
+ u_int envsize;
+ u_int i, namelen;
+
+ /*
+ * If we're passed an uninitialized list, allocate a single null
+ * entry before continuing.
+ */
+ if (*envp == NULL && *envsizep == 0) {
+ *envp = xmalloc(sizeof(char *));
+ *envp[0] = NULL;
+ *envsizep = 1;
+ }
/*
* Find the slot where the value should be stored. If the variable
xfree(env[i]);
} else {
/* New variable. Expand if necessary. */
- if (i >= (*envsizep) - 1) {
- (*envsizep) += 50;
- env = (*envp) = xrealloc(env, (*envsizep) * sizeof(char *));
+ envsize = *envsizep;
+ if (i >= envsize - 1) {
+ if (envsize >= 1000)
+ fatal("child_set_env: too many env vars");
+ envsize += 50;
+ env = (*envp) = xrealloc(env, envsize, sizeof(char *));
+ *envsizep = envsize;
}
/* Need to set the NULL pointer at end of array beyond the new slot. */
env[i + 1] = NULL;
*/
static void
read_environment_file(char ***env, u_int *envsize,
- const char *filename)
+ const char *filename)
{
FILE *f;
char buf[4096];
char *cp, *value;
+ u_int lineno = 0;
f = fopen(filename, "r");
if (!f)
return;
while (fgets(buf, sizeof(buf), f)) {
+ if (++lineno > 1000)
+ fatal("Too many lines in environment file %s", filename);
for (cp = buf; *cp == ' ' || *cp == '\t'; cp++)
;
if (!*cp || *cp == '#' || *cp == '\n')
continue;
- if (strchr(cp, '\n'))
- *strchr(cp, '\n') = '\0';
+
+ cp[strcspn(cp, "\n")] = '\0';
+
value = strchr(cp, '=');
if (value == NULL) {
- fprintf(stderr, "Bad line in %.100s: %.200s\n", filename, buf);
+ fprintf(stderr, "Bad line %u in %.100s\n", lineno,
+ filename);
continue;
}
/*
fclose(f);
}
-#ifdef USE_PAM
+#ifdef HAVE_ETC_DEFAULT_LOGIN
/*
- * Sets any environment variables which have been specified by PAM
+ * Return named variable from specified environment, or NULL if not present.
*/
-void do_pam_environment(char ***env, u_int *envsize)
+static char *
+child_get_env(char **env, const char *name)
{
- char *equals, var_name[512], var_val[512];
- char **pam_env;
int i;
+ size_t len;
- if ((pam_env = fetch_pam_environment()) == NULL)
- return;
+ len = strlen(name);
+ for (i=0; env[i] != NULL; i++)
+ if (strncmp(name, env[i], len) == 0 && env[i][len] == '=')
+ return(env[i] + len + 1);
+ return NULL;
+}
- for(i = 0; pam_env[i] != NULL; i++) {
- if ((equals = strstr(pam_env[i], "=")) == NULL)
- continue;
+/*
+ * Read /etc/default/login.
+ * We pick up the PATH (or SUPATH for root) and UMASK.
+ */
+static void
+read_etc_default_login(char ***env, u_int *envsize, uid_t uid)
+{
+ char **tmpenv = NULL, *var;
+ u_int i, tmpenvsize = 0;
+ u_long mask;
+
+ /*
+ * We don't want to copy the whole file to the child's environment,
+ * so we use a temporary environment and copy the variables we're
+ * interested in.
+ */
+ read_environment_file(&tmpenv, &tmpenvsize, "/etc/default/login");
- if (strlen(pam_env[i]) < (sizeof(var_name) - 1)) {
- memset(var_name, '\0', sizeof(var_name));
- memset(var_val, '\0', sizeof(var_val));
+ if (tmpenv == NULL)
+ return;
- strncpy(var_name, pam_env[i], equals - pam_env[i]);
- strcpy(var_val, equals + 1);
+ if (uid == 0)
+ var = child_get_env(tmpenv, "SUPATH");
+ else
+ var = child_get_env(tmpenv, "PATH");
+ if (var != NULL)
+ child_set_env(env, envsize, "PATH", var);
- debug3("PAM environment: %s=%s", var_name, var_val);
+ if ((var = child_get_env(tmpenv, "UMASK")) != NULL)
+ if (sscanf(var, "%5lo", &mask) == 1)
+ umask((mode_t)mask);
- child_set_env(env, envsize, var_name, var_val);
- }
- }
+ for (i = 0; tmpenv[i] != NULL; i++)
+ xfree(tmpenv[i]);
+ xfree(tmpenv);
}
-#endif /* USE_PAM */
+#endif /* HAVE_ETC_DEFAULT_LOGIN */
-#ifdef HAVE_CYGWIN
-void copy_environment(char ***env, u_int *envsize)
+void
+copy_environment(char **source, char ***env, u_int *envsize)
{
- char *equals, var_name[512], var_val[512];
+ char *var_name, *var_val;
int i;
- for(i = 0; environ[i] != NULL; i++) {
- if ((equals = strstr(environ[i], "=")) == NULL)
- continue;
-
- if (strlen(environ[i]) < (sizeof(var_name) - 1)) {
- memset(var_name, '\0', sizeof(var_name));
- memset(var_val, '\0', sizeof(var_val));
+ if (source == NULL)
+ return;
- strncpy(var_name, environ[i], equals - environ[i]);
- strcpy(var_val, equals + 1);
+ for(i = 0; source[i] != NULL; i++) {
+ var_name = xstrdup(source[i]);
+ if ((var_val = strstr(var_name, "=")) == NULL) {
+ xfree(var_name);
+ continue;
+ }
+ *var_val++ = '\0';
- debug3("Copy environment: %s=%s", var_name, var_val);
+ debug3("Copy environment: %s=%s", var_name, var_val);
+ child_set_env(env, envsize, var_name, var_val);
- child_set_env(env, envsize, var_name, var_val);
- }
+ xfree(var_name);
}
}
-#endif
-#if defined(HAVE_GETUSERATTR)
-/*
- * AIX-specific login initialisation
- */
-void set_limit(char *user, char *soft, char *hard, int resource, int mult)
+static char **
+do_setup_env(Session *s, const char *shell)
{
- struct rlimit rlim;
- int slim, hlim;
-
- getrlimit(resource, &rlim);
-
- slim = 0;
- if (getuserattr(user, soft, &slim, SEC_INT) != -1) {
- if (slim < 0) {
- rlim.rlim_cur = RLIM_INFINITY;
- } else if (slim != 0) {
- /* See the wackiness below */
- if (rlim.rlim_cur == slim * mult)
- slim = 0;
- else
- rlim.rlim_cur = slim * mult;
- }
- }
+ char buf[256];
+ u_int i, envsize;
+ char **env, *laddr;
+ struct passwd *pw = s->pw;
+#ifndef HAVE_LOGIN_CAP
+ char *path = NULL;
+#endif
- hlim = 0;
- if (getuserattr(user, hard, &hlim, SEC_INT) != -1) {
- if (hlim < 0) {
- rlim.rlim_max = RLIM_INFINITY;
- } else if (hlim != 0) {
- rlim.rlim_max = hlim * mult;
- }
- }
+ /* Initialize the environment. */
+ envsize = 100;
+ env = xcalloc(envsize, sizeof(char *));
+ env[0] = NULL;
+#ifdef HAVE_CYGWIN
/*
- * XXX For cpu and fsize the soft limit is set to the hard limit
- * if the hard limit is left at its default value and the soft limit
- * is changed from its default value, either by requesting it
- * (slim == 0) or by setting it to the current default. At least
- * that's how rlogind does it. If you're confused you're not alone.
- * Bug or feature? AIX 4.3.1.2
+ * The Windows environment contains some setting which are
+ * important for a running system. They must not be dropped.
*/
- if ((!strcmp(soft, "fsize") || !strcmp(soft, "cpu"))
- && hlim == 0 && slim != 0)
- rlim.rlim_max = rlim.rlim_cur;
- /* A specified hard limit limits the soft limit */
- else if (hlim > 0 && rlim.rlim_cur > rlim.rlim_max)
- rlim.rlim_cur = rlim.rlim_max;
- /* A soft limit can increase a hard limit */
- else if (rlim.rlim_cur > rlim.rlim_max)
- rlim.rlim_max = rlim.rlim_cur;
-
- if (setrlimit(resource, &rlim) != 0)
- error("setrlimit(%.10s) failed: %.100s", soft, strerror(errno));
-}
+ {
+ char **p;
-void set_limits_from_userattr(char *user)
-{
- int mask;
- char buf[16];
-
- set_limit(user, S_UFSIZE, S_UFSIZE_HARD, RLIMIT_FSIZE, 512);
- set_limit(user, S_UCPU, S_UCPU_HARD, RLIMIT_CPU, 1);
- set_limit(user, S_UDATA, S_UDATA_HARD, RLIMIT_DATA, 512);
- set_limit(user, S_USTACK, S_USTACK_HARD, RLIMIT_STACK, 512);
- set_limit(user, S_URSS, S_URSS_HARD, RLIMIT_RSS, 512);
- set_limit(user, S_UCORE, S_UCORE_HARD, RLIMIT_CORE, 512);
-#if defined(S_UNOFILE)
- set_limit(user, S_UNOFILE, S_UNOFILE_HARD, RLIMIT_NOFILE, 1);
+ p = fetch_windows_environment();
+ copy_environment(p, &env, &envsize);
+ free_windows_environment(p);
+ }
#endif
- if (getuserattr(user, S_UMASK, &mask, SEC_INT) != -1) {
- /* Convert decimal to octal */
- (void) snprintf(buf, sizeof(buf), "%d", mask);
- if (sscanf(buf, "%o", &mask) == 1)
- umask(mask);
- }
-}
-#endif /* defined(HAVE_GETUSERATTR) */
-
-/*
- * Performs common processing for the child, such as setting up the
- * environment, closing extra file descriptors, setting the user and group
- * ids, and executing the command or shell.
- */
-void
-do_child(Session *s, const char *command)
-{
- const char *shell, *hostname = NULL, *cp = NULL;
- struct passwd *pw = s->pw;
- char buf[256];
- char cmd[1024];
- FILE *f = NULL;
- u_int envsize, i;
- char **env;
- extern char **environ;
- struct stat st;
- char *argv[10];
- int do_xauth;
-#ifdef WITH_IRIX_PROJECT
- prid_t projid;
-#endif /* WITH_IRIX_PROJECT */
-#ifdef WITH_IRIX_JOBS
- jid_t jid = 0;
-#else
-#ifdef WITH_IRIX_ARRAY
- int jid = 0;
-#endif /* WITH_IRIX_ARRAY */
-#endif /* WITH_IRIX_JOBS */
-
- do_xauth =
- s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
-
- /* remove hostkey from the child's memory */
- destroy_sensitive_data();
-
- /* login(1) is only called if we execute the login shell */
- if (options.use_login && command != NULL)
- options.use_login = 0;
-
-#if !defined(HAVE_OSF_SIA)
- if (!options.use_login) {
-# ifdef HAVE_LOGIN_CAP
- if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
- f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
- _PATH_NOLOGIN), "r");
-# else /* HAVE_LOGIN_CAP */
- if (pw->pw_uid)
- f = fopen(_PATH_NOLOGIN, "r");
-# endif /* HAVE_LOGIN_CAP */
- if (f) {
- /* /etc/nologin exists. Print its contents and exit. */
- while (fgets(buf, sizeof(buf), f))
- fputs(buf, stderr);
- fclose(f);
- exit(254);
- }
- }
-#endif /* HAVE_OSF_SIA */
-
- /* Set login name, uid, gid, and groups. */
- /* Login(1) does this as well, and it needs uid 0 for the "-h"
- switch, so we let login(1) to this for us. */
- if (!options.use_login) {
-#ifdef HAVE_OSF_SIA
- session_setup_sia(pw->pw_name, s->ttyfd == -1 ? NULL : s->tty);
- if (!check_quietlogin(s, command))
- do_motd();
-#else /* HAVE_OSF_SIA */
-#ifdef HAVE_CYGWIN
- if (is_winnt) {
-#else
- if (getuid() == 0 || geteuid() == 0) {
-#endif
-# ifdef HAVE_GETUSERATTR
- set_limits_from_userattr(pw->pw_name);
-# endif /* HAVE_GETUSERATTR */
-# ifdef HAVE_LOGIN_CAP
- if (setusercontext(lc, pw, pw->pw_uid,
- (LOGIN_SETALL & ~LOGIN_SETPATH)) < 0) {
- perror("unable to set user context");
- exit(1);
- }
-# else /* HAVE_LOGIN_CAP */
-#if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
- /* Sets login uid for accounting */
- if (getluid() == -1 && setluid(pw->pw_uid) == -1)
- error("setluid: %s", strerror(errno));
-#endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
-
- if (setlogin(pw->pw_name) < 0)
- error("setlogin failed: %s", strerror(errno));
- if (setgid(pw->pw_gid) < 0) {
- perror("setgid");
- exit(1);
- }
- /* Initialize the group list. */
- if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
- perror("initgroups");
- exit(1);
- }
- endgrent();
-# ifdef USE_PAM
- /*
- * PAM credentials may take the form of
- * supplementary groups. These will have been
- * wiped by the above initgroups() call.
- * Reestablish them here.
- */
- do_pam_setcred(0);
-# endif /* USE_PAM */
-# ifdef WITH_IRIX_JOBS
- jid = jlimit_startjob(pw->pw_name, pw->pw_uid, "interactive");
- if (jid == -1) {
- fatal("Failed to create job container: %.100s",
- strerror(errno));
- }
-# endif /* WITH_IRIX_JOBS */
-# ifdef WITH_IRIX_ARRAY
- /* initialize array session */
- if (jid == 0) {
- if (newarraysess() != 0)
- fatal("Failed to set up new array session: %.100s",
- strerror(errno));
- }
-# endif /* WITH_IRIX_ARRAY */
-# ifdef WITH_IRIX_PROJECT
- /* initialize irix project info */
- if ((projid = getdfltprojuser(pw->pw_name)) == -1) {
- debug("Failed to get project id, using projid 0");
- projid = 0;
- }
- if (setprid(projid))
- fatal("Failed to initialize project %d for %s: %.100s",
- (int)projid, pw->pw_name, strerror(errno));
-# endif /* WITH_IRIX_PROJECT */
-#ifdef WITH_IRIX_AUDIT
- if (sysconf(_SC_AUDIT)) {
- debug("Setting sat id to %d", (int) pw->pw_uid);
- if (satsetid(pw->pw_uid))
- debug("error setting satid: %.100s", strerror(errno));
- }
-#endif /* WITH_IRIX_AUDIT */
-
-#ifdef _AIX
- /*
- * AIX has a "usrinfo" area where logname and
- * other stuff is stored - a few applications
- * actually use this and die if it's not set
- */
- if (s->ttyfd == -1)
- s->tty[0] = '\0';
- cp = xmalloc(22 + strlen(s->tty) +
- 2 * strlen(pw->pw_name));
- i = sprintf(cp, "LOGNAME=%s%cNAME=%s%cTTY=%s%c%c",
- pw->pw_name, 0, pw->pw_name, 0, s->tty, 0, 0);
- if (usrinfo(SETUINFO, cp, i) == -1)
- fatal("Couldn't set usrinfo: %s",
- strerror(errno));
- debug3("AIX/UsrInfo: set len %d", i);
- xfree(cp);
-#endif
-
- /* Permanently switch to the desired uid. */
- permanently_set_uid(pw);
-# endif /* HAVE_LOGIN_CAP */
- }
-#endif /* HAVE_OSF_SIA */
-
-#ifdef HAVE_CYGWIN
- if (is_winnt)
-#endif
- if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
- fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
- }
- /*
- * Get the shell from the password data. An empty shell field is
- * legal, and means /bin/sh.
- */
- shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
-#ifdef HAVE_LOGIN_CAP
- shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
-#endif
-
- /* Initialize the environment. */
- envsize = 100;
- env = xmalloc(envsize * sizeof(char *));
- env[0] = NULL;
-
-#ifdef HAVE_CYGWIN
- /*
- * The Windows environment contains some setting which are
- * important for a running system. They must not be dropped.
- */
- copy_environment(&env, &envsize);
-#endif
+#ifdef GSSAPI
+ /* Allow any GSSAPI methods that we've used to alter
+ * the childs environment as they see fit
+ */
+ ssh_gssapi_do_child(&env, &envsize);
+#endif
if (!options.use_login) {
/* Set basic environment. */
+ for (i = 0; i < s->num_env; i++)
+ child_set_env(&env, &envsize, s->env[i].name,
+ s->env[i].val);
+
child_set_env(&env, &envsize, "USER", pw->pw_name);
child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
+#ifdef _AIX
+ child_set_env(&env, &envsize, "LOGIN", pw->pw_name);
+#endif
child_set_env(&env, &envsize, "HOME", pw->pw_dir);
#ifdef HAVE_LOGIN_CAP
- (void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH);
- child_set_env(&env, &envsize, "PATH", getenv("PATH"));
+ if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH) < 0)
+ child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
+ else
+ child_set_env(&env, &envsize, "PATH", getenv("PATH"));
#else /* HAVE_LOGIN_CAP */
# ifndef HAVE_CYGWIN
/*
* needed for loading shared libraries. So the path better
* remains intact here.
*/
- child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
+# ifdef HAVE_ETC_DEFAULT_LOGIN
+ read_etc_default_login(&env, &envsize, pw->pw_uid);
+ path = child_get_env(env, "PATH");
+# endif /* HAVE_ETC_DEFAULT_LOGIN */
+ if (path == NULL || *path == '\0') {
+ child_set_env(&env, &envsize, "PATH",
+ s->pw->pw_uid == 0 ?
+ SUPERUSER_PATH : _PATH_STDPATH);
+ }
# endif /* HAVE_CYGWIN */
#endif /* HAVE_LOGIN_CAP */
if (!options.use_login) {
while (custom_environment) {
struct envstring *ce = custom_environment;
- char *s = ce->s;
- int i;
- for (i = 0; s[i] != '=' && s[i]; i++)
+ char *str = ce->s;
+
+ for (i = 0; str[i] != '=' && str[i]; i++)
;
- if (s[i] == '=') {
- s[i] = 0;
- child_set_env(&env, &envsize, s, s + i + 1);
+ if (str[i] == '=') {
+ str[i] = 0;
+ child_set_env(&env, &envsize, str, str + i + 1);
}
custom_environment = ce->next;
xfree(ce->s);
}
}
+ /* SSH_CLIENT deprecated */
snprintf(buf, sizeof buf, "%.50s %d %d",
- get_remote_ipaddr(), get_remote_port(), get_local_port());
+ get_remote_ipaddr(), get_remote_port(), get_local_port());
child_set_env(&env, &envsize, "SSH_CLIENT", buf);
+ laddr = get_local_ipaddr(packet_get_connection_in());
+ snprintf(buf, sizeof buf, "%.50s %d %.50s %d",
+ get_remote_ipaddr(), get_remote_port(), laddr, get_local_port());
+ xfree(laddr);
+ child_set_env(&env, &envsize, "SSH_CONNECTION", buf);
+
if (s->ttyfd != -1)
child_set_env(&env, &envsize, "SSH_TTY", s->tty);
if (s->term)
child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
original_command);
+#ifdef _UNICOS
+ if (cray_tmpdir[0] != '\0')
+ child_set_env(&env, &envsize, "TMPDIR", cray_tmpdir);
+#endif /* _UNICOS */
+
+ /*
+ * Since we clear KRB5CCNAME at startup, if it's set now then it
+ * must have been set by a native authentication method (eg AIX or
+ * SIA), so copy it to the child.
+ */
+ {
+ char *cp;
+
+ if ((cp = getenv("KRB5CCNAME")) != NULL)
+ child_set_env(&env, &envsize, "KRB5CCNAME", cp);
+ }
+
#ifdef _AIX
- if ((cp = getenv("AUTHSTATE")) != NULL)
- child_set_env(&env, &envsize, "AUTHSTATE", cp);
- if ((cp = getenv("KRB5CCNAME")) != NULL)
- child_set_env(&env, &envsize, "KRB5CCNAME", cp);
- read_environment_file(&env, &envsize, "/etc/environment");
-#endif
-#ifdef KRB4
- if (s->authctxt->krb4_ticket_file)
- child_set_env(&env, &envsize, "KRBTKFILE",
- s->authctxt->krb4_ticket_file);
+ {
+ char *cp;
+
+ if ((cp = getenv("AUTHSTATE")) != NULL)
+ child_set_env(&env, &envsize, "AUTHSTATE", cp);
+ read_environment_file(&env, &envsize, "/etc/environment");
+ }
#endif
#ifdef KRB5
- if (s->authctxt->krb5_ticket_file)
+ if (s->authctxt->krb5_ccname)
child_set_env(&env, &envsize, "KRB5CCNAME",
- s->authctxt->krb5_ticket_file);
+ s->authctxt->krb5_ccname);
#endif
#ifdef USE_PAM
- /* Pull in any environment variables that may have been set by PAM. */
- do_pam_environment(&env, &envsize);
+ /*
+ * Pull in any environment variables that may have
+ * been set by PAM.
+ */
+ if (options.use_pam) {
+ char **p;
+
+ p = fetch_pam_child_environment();
+ copy_environment(p, &env, &envsize);
+ free_pam_environment(p);
+
+ p = fetch_pam_environment();
+ copy_environment(p, &env, &envsize);
+ free_pam_environment(p);
+ }
#endif /* USE_PAM */
- if (auth_get_socket_name() != NULL)
+ if (auth_sock_name != NULL)
child_set_env(&env, &envsize, SSH_AUTHSOCKET_ENV_NAME,
- auth_get_socket_name());
+ auth_sock_name);
/* read $HOME/.ssh/environment. */
- if (!options.use_login) {
+ if (options.permit_user_env && !options.use_login) {
snprintf(buf, sizeof buf, "%.200s/.ssh/environment",
- pw->pw_dir);
+ strcmp(pw->pw_dir, "/") ? pw->pw_dir : "");
read_environment_file(&env, &envsize, buf);
}
if (debug_flag) {
for (i = 0; env[i]; i++)
fprintf(stderr, " %.200s\n", env[i]);
}
- /* we have to stash the hostname before we close our socket. */
- if (options.use_login)
- hostname = get_remote_name_or_ip(utmp_len,
- options.reverse_mapping_check);
+ return env;
+}
+
+/*
+ * Run $HOME/.ssh/rc, /etc/ssh/sshrc, or xauth (whichever is found
+ * first in this order).
+ */
+static void
+do_rc_files(Session *s, const char *shell)
+{
+ FILE *f = NULL;
+ char cmd[1024];
+ int do_xauth;
+ struct stat st;
+
+ do_xauth =
+ s->display != NULL && s->auth_proto != NULL && s->auth_data != NULL;
+
+ /* ignore _PATH_SSH_USER_RC for subsystems and admin forced commands */
+ if (!s->is_subsystem && options.adm_forced_command == NULL &&
+ !no_user_rc && stat(_PATH_SSH_USER_RC, &st) >= 0) {
+ snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
+ shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
+ if (debug_flag)
+ fprintf(stderr, "Running %s\n", cmd);
+ f = popen(cmd, "w");
+ if (f) {
+ if (do_xauth)
+ fprintf(f, "%s %s\n", s->auth_proto,
+ s->auth_data);
+ pclose(f);
+ } else
+ fprintf(stderr, "Could not run %s\n",
+ _PATH_SSH_USER_RC);
+ } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
+ if (debug_flag)
+ fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
+ _PATH_SSH_SYSTEM_RC);
+ f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
+ if (f) {
+ if (do_xauth)
+ fprintf(f, "%s %s\n", s->auth_proto,
+ s->auth_data);
+ pclose(f);
+ } else
+ fprintf(stderr, "Could not run %s\n",
+ _PATH_SSH_SYSTEM_RC);
+ } else if (do_xauth && options.xauth_location != NULL) {
+ /* Add authority data to .Xauthority if appropriate. */
+ if (debug_flag) {
+ fprintf(stderr,
+ "Running %.500s remove %.100s\n",
+ options.xauth_location, s->auth_display);
+ fprintf(stderr,
+ "%.500s add %.100s %.100s %.100s\n",
+ options.xauth_location, s->auth_display,
+ s->auth_proto, s->auth_data);
+ }
+ snprintf(cmd, sizeof cmd, "%s -q -",
+ options.xauth_location);
+ f = popen(cmd, "w");
+ if (f) {
+ fprintf(f, "remove %s\n",
+ s->auth_display);
+ fprintf(f, "add %s %s %s\n",
+ s->auth_display, s->auth_proto,
+ s->auth_data);
+ pclose(f);
+ } else {
+ fprintf(stderr, "Could not run %s\n",
+ cmd);
+ }
+ }
+}
+
+static void
+do_nologin(struct passwd *pw)
+{
+ FILE *f = NULL;
+ char buf[1024];
+
+#ifdef HAVE_LOGIN_CAP
+ if (!login_getcapbool(lc, "ignorenologin", 0) && pw->pw_uid)
+ f = fopen(login_getcapstr(lc, "nologin", _PATH_NOLOGIN,
+ _PATH_NOLOGIN), "r");
+#else
+ if (pw->pw_uid)
+ f = fopen(_PATH_NOLOGIN, "r");
+#endif
+ if (f) {
+ /* /etc/nologin exists. Print its contents and exit. */
+ logit("User %.100s not allowed because %s exists",
+ pw->pw_name, _PATH_NOLOGIN);
+ while (fgets(buf, sizeof(buf), f))
+ fputs(buf, stderr);
+ fclose(f);
+ fflush(NULL);
+ exit(254);
+ }
+}
+
+/*
+ * Chroot into a directory after checking it for safety: all path components
+ * must be root-owned directories with strict permissions.
+ */
+static void
+safely_chroot(const char *path, uid_t uid)
+{
+ const char *cp;
+ char component[MAXPATHLEN];
+ struct stat st;
+
+ if (*path != '/')
+ fatal("chroot path does not begin at root");
+ if (strlen(path) >= sizeof(component))
+ fatal("chroot path too long");
+
/*
- * Close the connection descriptors; note that this is the child, and
- * the server will still have the socket open, and it is important
- * that we do not shutdown it. Note that the descriptors cannot be
- * closed before building the environment, as we call
- * get_remote_ipaddr there.
+ * Descend the path, checking that each component is a
+ * root-owned directory with strict permissions.
*/
+ for (cp = path; cp != NULL;) {
+ if ((cp = strchr(cp, '/')) == NULL)
+ strlcpy(component, path, sizeof(component));
+ else {
+ cp++;
+ memcpy(component, path, cp - path);
+ component[cp - path] = '\0';
+ }
+
+ debug3("%s: checking '%s'", __func__, component);
+
+ if (stat(component, &st) != 0)
+ fatal("%s: stat(\"%s\"): %s", __func__,
+ component, strerror(errno));
+ if (st.st_uid != 0 || (st.st_mode & 022) != 0)
+ fatal("bad ownership or modes for chroot "
+ "directory %s\"%s\"",
+ cp == NULL ? "" : "component ", component);
+ if (!S_ISDIR(st.st_mode))
+ fatal("chroot path %s\"%s\" is not a directory",
+ cp == NULL ? "" : "component ", component);
+
+ }
+
+ if (chdir(path) == -1)
+ fatal("Unable to chdir to chroot path \"%s\": "
+ "%s", path, strerror(errno));
+ if (chroot(path) == -1)
+ fatal("chroot(\"%s\"): %s", path, strerror(errno));
+ if (chdir("/") == -1)
+ fatal("%s: chdir(/) after chroot: %s",
+ __func__, strerror(errno));
+ verbose("Changed root directory to \"%s\"", path);
+}
+
+/* Set login name, uid, gid, and groups. */
+void
+do_setusercontext(struct passwd *pw)
+{
+ char *chroot_path, *tmp;
+
+#ifdef WITH_SELINUX
+ /* Cache selinux status for later use */
+ (void)ssh_selinux_enabled();
+#endif
+
+#ifndef HAVE_CYGWIN
+ if (getuid() == 0 || geteuid() == 0)
+#endif /* HAVE_CYGWIN */
+ {
+
+#ifdef HAVE_SETPCRED
+ if (setpcred(pw->pw_name, (char **)NULL) == -1)
+ fatal("Failed to set process credentials");
+#endif /* HAVE_SETPCRED */
+#ifdef HAVE_LOGIN_CAP
+# ifdef __bsdi__
+ setpgid(0, 0);
+# endif
+# ifdef USE_PAM
+ if (options.use_pam) {
+ do_pam_setcred(use_privsep);
+ }
+# endif /* USE_PAM */
+ if (setusercontext(lc, pw, pw->pw_uid,
+ (LOGIN_SETALL & ~(LOGIN_SETPATH|LOGIN_SETUSER))) < 0) {
+ perror("unable to set user context");
+ exit(1);
+ }
+#else
+# if defined(HAVE_GETLUID) && defined(HAVE_SETLUID)
+ /* Sets login uid for accounting */
+ if (getluid() == -1 && setluid(pw->pw_uid) == -1)
+ error("setluid: %s", strerror(errno));
+# endif /* defined(HAVE_GETLUID) && defined(HAVE_SETLUID) */
+
+ if (setlogin(pw->pw_name) < 0)
+ error("setlogin failed: %s", strerror(errno));
+ if (setgid(pw->pw_gid) < 0) {
+ perror("setgid");
+ exit(1);
+ }
+ /* Initialize the group list. */
+ if (initgroups(pw->pw_name, pw->pw_gid) < 0) {
+ perror("initgroups");
+ exit(1);
+ }
+ endgrent();
+# ifdef USE_PAM
+ /*
+ * PAM credentials may take the form of supplementary groups.
+ * These will have been wiped by the above initgroups() call.
+ * Reestablish them here.
+ */
+ if (options.use_pam) {
+ do_pam_setcred(use_privsep);
+ }
+# endif /* USE_PAM */
+# if defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY)
+ irix_setusercontext(pw);
+# endif /* defined(WITH_IRIX_PROJECT) || defined(WITH_IRIX_JOBS) || defined(WITH_IRIX_ARRAY) */
+# ifdef _AIX
+ aix_usrinfo(pw);
+# endif /* _AIX */
+# ifdef USE_LIBIAF
+ if (set_id(pw->pw_name) != 0) {
+ exit(1);
+ }
+# endif /* USE_LIBIAF */
+#endif
+
+ if (options.chroot_directory != NULL &&
+ strcasecmp(options.chroot_directory, "none") != 0) {
+ tmp = tilde_expand_filename(options.chroot_directory,
+ pw->pw_uid);
+ chroot_path = percent_expand(tmp, "h", pw->pw_dir,
+ "u", pw->pw_name, (char *)NULL);
+ safely_chroot(chroot_path, pw->pw_uid);
+ free(tmp);
+ free(chroot_path);
+ }
+
+#ifdef HAVE_LOGIN_CAP
+ if (setusercontext(lc, pw, pw->pw_uid, LOGIN_SETUSER) < 0) {
+ perror("unable to set user context (setuser)");
+ exit(1);
+ }
+#else
+ /* Permanently switch to the desired uid. */
+ permanently_set_uid(pw);
+#endif
+ }
+
+#ifdef HAVE_CYGWIN
+ if (is_winnt)
+#endif
+ if (getuid() != pw->pw_uid || geteuid() != pw->pw_uid)
+ fatal("Failed to set uids to %u.", (u_int) pw->pw_uid);
+
+#ifdef WITH_SELINUX
+ ssh_selinux_setup_exec_context(pw->pw_name);
+#endif
+}
+
+static void
+do_pwchange(Session *s)
+{
+ fflush(NULL);
+ fprintf(stderr, "WARNING: Your password has expired.\n");
+ if (s->ttyfd != -1) {
+ fprintf(stderr,
+ "You must change your password now and login again!\n");
+#ifdef PASSWD_NEEDS_USERNAME
+ execl(_PATH_PASSWD_PROG, "passwd", s->pw->pw_name,
+ (char *)NULL);
+#else
+ execl(_PATH_PASSWD_PROG, "passwd", (char *)NULL);
+#endif
+ perror("passwd");
+ } else {
+ fprintf(stderr,
+ "Password change required but no TTY available.\n");
+ }
+ exit(1);
+}
+
+static void
+launch_login(struct passwd *pw, const char *hostname)
+{
+ /* Launch login(1). */
+
+ execl(LOGIN_PROGRAM, "login", "-h", hostname,
+#ifdef xxxLOGIN_NEEDS_TERM
+ (s->term ? s->term : "unknown"),
+#endif /* LOGIN_NEEDS_TERM */
+#ifdef LOGIN_NO_ENDOPT
+ "-p", "-f", pw->pw_name, (char *)NULL);
+#else
+ "-p", "-f", "--", pw->pw_name, (char *)NULL);
+#endif
+
+ /* Login couldn't be executed, die. */
+
+ perror("login");
+ exit(1);
+}
+
+static void
+child_close_fds(void)
+{
+ int i;
+
if (packet_get_connection_in() == packet_get_connection_out())
close(packet_get_connection_in());
else {
endpwent();
/*
- * Close any extra open file descriptors so that we don\'t have them
+ * Close any extra open file descriptors so that we don't have them
* hanging around in clients. Note that we want to do this after
* initgroups, because at least on Solaris 2.3 it leaves file
* descriptors open.
*/
for (i = 3; i < 64; i++)
close(i);
+}
+
+/*
+ * Performs common processing for the child, such as setting up the
+ * environment, closing extra file descriptors, setting the user and group
+ * ids, and executing the command or shell.
+ */
+#define ARGV_MAX 10
+void
+do_child(Session *s, const char *command)
+{
+ extern char **environ;
+ char **env;
+ char *argv[ARGV_MAX];
+ const char *shell, *shell0, *hostname = NULL;
+ struct passwd *pw = s->pw;
+ int r = 0;
+
+ /* remove hostkey from the child's memory */
+ destroy_sensitive_data();
+
+ /* Force a password change */
+ if (s->authctxt->force_pwchange) {
+ do_setusercontext(pw);
+ child_close_fds();
+ do_pwchange(s);
+ exit(1);
+ }
+
+ /* login(1) is only called if we execute the login shell */
+ if (options.use_login && command != NULL)
+ options.use_login = 0;
+
+#ifdef _UNICOS
+ cray_setup(pw->pw_uid, pw->pw_name, command);
+#endif /* _UNICOS */
+
+ /*
+ * Login(1) does this as well, and it needs uid 0 for the "-h"
+ * switch, so we let login(1) to this for us.
+ */
+ if (!options.use_login) {
+#ifdef HAVE_OSF_SIA
+ session_setup_sia(pw, s->ttyfd == -1 ? NULL : s->tty);
+ if (!check_quietlogin(s, command))
+ do_motd();
+#else /* HAVE_OSF_SIA */
+ /* When PAM is enabled we rely on it to do the nologin check */
+ if (!options.use_pam)
+ do_nologin(pw);
+ do_setusercontext(pw);
+ /*
+ * PAM session modules in do_setusercontext may have
+ * generated messages, so if this in an interactive
+ * login then display them too.
+ */
+ if (!check_quietlogin(s, command))
+ display_loginmsg();
+#endif /* HAVE_OSF_SIA */
+ }
+
+#ifdef USE_PAM
+ if (options.use_pam && !options.use_login && !is_pam_session_open()) {
+ debug3("PAM session not opened, exiting");
+ display_loginmsg();
+ exit(254);
+ }
+#endif
+
+ /*
+ * Get the shell from the password data. An empty shell field is
+ * legal, and means /bin/sh.
+ */
+ shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
+
+ /*
+ * Make sure $SHELL points to the shell from the password file,
+ * even if shell is overridden from login.conf
+ */
+ env = do_setup_env(s, shell);
+
+#ifdef HAVE_LOGIN_CAP
+ shell = login_getcapstr(lc, "shell", (char *)shell, (char *)shell);
+#endif
+
+ /* we have to stash the hostname before we close our socket. */
+ if (options.use_login)
+ hostname = get_remote_name_or_ip(utmp_len,
+ options.use_dns);
+ /*
+ * Close the connection descriptors; note that this is the child, and
+ * the server will still have the socket open, and it is important
+ * that we do not shutdown it. Note that the descriptors cannot be
+ * closed before building the environment, as we call
+ * get_remote_ipaddr there.
+ */
+ child_close_fds();
/*
- * Must take new environment into use so that .ssh/rc, /etc/sshrc and
- * xauth are run in the proper environment.
+ * Must take new environment into use so that .ssh/rc,
+ * /etc/ssh/sshrc and xauth are run in the proper environment.
*/
environ = env;
-#ifdef AFS
- /* Try to get AFS tokens for the local cell. */
- if (k_hasafs()) {
+#if defined(KRB5) && defined(USE_AFS)
+ /*
+ * At this point, we check to see if AFS is active and if we have
+ * a valid Kerberos 5 TGT. If so, it seems like a good idea to see
+ * if we can (and need to) extend the ticket into an AFS token. If
+ * we don't do this, we run into potential problems if the user's
+ * home directory is in AFS and it's not world-readable.
+ */
+
+ if (options.kerberos_get_afs_token && k_hasafs() &&
+ (s->authctxt->krb5_ctx != NULL)) {
char cell[64];
-
+
+ debug("Getting AFS token");
+
+ k_setpag();
+
if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
- krb_afslog(cell, 0);
-
- krb_afslog(0, 0);
+ krb5_afslog(s->authctxt->krb5_ctx,
+ s->authctxt->krb5_fwd_ccache, cell, NULL);
+
+ krb5_afslog_home(s->authctxt->krb5_ctx,
+ s->authctxt->krb5_fwd_ccache, NULL, NULL, pw->pw_dir);
}
-#endif /* AFS */
+#endif
- /* Change current directory to the user\'s home directory. */
+ /* Change current directory to the user's home directory. */
if (chdir(pw->pw_dir) < 0) {
- fprintf(stderr, "Could not chdir to home directory %s: %s\n",
- pw->pw_dir, strerror(errno));
+ /* Suppress missing homedir warning for chroot case */
#ifdef HAVE_LOGIN_CAP
- if (login_getcapbool(lc, "requirehome", 0))
- exit(1);
+ r = login_getcapbool(lc, "requirehome", 0);
#endif
+ if (r || options.chroot_directory == NULL)
+ fprintf(stderr, "Could not chdir to home "
+ "directory %s: %s\n", pw->pw_dir,
+ strerror(errno));
+ if (r)
+ exit(1);
}
- /*
- * Run $HOME/.ssh/rc, /etc/sshrc, or xauth (whichever is found first
- * in this order).
- */
- if (!options.use_login) {
- /* ignore _PATH_SSH_USER_RC for subsystems */
- if (!s->is_subsystem && (stat(_PATH_SSH_USER_RC, &st) >= 0)) {
- snprintf(cmd, sizeof cmd, "%s -c '%s %s'",
- shell, _PATH_BSHELL, _PATH_SSH_USER_RC);
- if (debug_flag)
- fprintf(stderr, "Running %s\n", cmd);
- f = popen(cmd, "w");
- if (f) {
- if (do_xauth)
- fprintf(f, "%s %s\n", s->auth_proto,
- s->auth_data);
- pclose(f);
- } else
- fprintf(stderr, "Could not run %s\n",
- _PATH_SSH_USER_RC);
- } else if (stat(_PATH_SSH_SYSTEM_RC, &st) >= 0) {
- if (debug_flag)
- fprintf(stderr, "Running %s %s\n", _PATH_BSHELL,
- _PATH_SSH_SYSTEM_RC);
- f = popen(_PATH_BSHELL " " _PATH_SSH_SYSTEM_RC, "w");
- if (f) {
- if (do_xauth)
- fprintf(f, "%s %s\n", s->auth_proto,
- s->auth_data);
- pclose(f);
- } else
- fprintf(stderr, "Could not run %s\n",
- _PATH_SSH_SYSTEM_RC);
- } else if (do_xauth && options.xauth_location != NULL) {
- /* Add authority data to .Xauthority if appropriate. */
- char *screen = strchr(s->display, ':');
-
- if (debug_flag) {
- fprintf(stderr,
- "Running %.100s add "
- "%.100s %.100s %.100s\n",
- options.xauth_location, s->display,
- s->auth_proto, s->auth_data);
- if (screen != NULL)
- fprintf(stderr,
- "Adding %.*s/unix%s %s %s\n",
- (int)(screen - s->display),
- s->display, screen,
- s->auth_proto, s->auth_data);
- }
- snprintf(cmd, sizeof cmd, "%s -q -",
- options.xauth_location);
- f = popen(cmd, "w");
- if (f) {
- fprintf(f, "add %s %s %s\n", s->display,
- s->auth_proto, s->auth_data);
- if (screen != NULL)
- fprintf(f, "add %.*s/unix%s %s %s\n",
- (int)(screen - s->display),
- s->display, screen,
- s->auth_proto,
- s->auth_data);
- pclose(f);
- } else {
- fprintf(stderr, "Could not run %s\n",
- cmd);
- }
- }
- /* Get the last component of the shell name. */
- cp = strrchr(shell, '/');
- if (cp)
- cp++;
- else
- cp = shell;
- }
+ closefrom(STDERR_FILENO + 1);
+
+ if (!options.use_login)
+ do_rc_files(s, shell);
/* restore SIGPIPE for child */
- signal(SIGPIPE, SIG_DFL);
+ signal(SIGPIPE, SIG_DFL);
+
+ if (s->is_subsystem == SUBSYSTEM_INT_SFTP) {
+ extern int optind, optreset;
+ int i;
+ char *p, *args;
+
+ setproctitle("%s@internal-sftp-server", s->pw->pw_name);
+ args = strdup(command ? command : "sftp-server");
+ for (i = 0, (p = strtok(args, " ")); p; (p = strtok(NULL, " ")))
+ if (i < ARGV_MAX - 1)
+ argv[i++] = p;
+ argv[i] = NULL;
+ optind = optreset = 1;
+ __progname = argv[0];
+ exit(sftp_server_main(i, argv, s->pw));
+ }
+
+ if (options.use_login) {
+ launch_login(pw, hostname);
+ /* NEVERREACHED */
+ }
+
+ /* Get the last component of the shell name. */
+ if ((shell0 = strrchr(shell, '/')) != NULL)
+ shell0++;
+ else
+ shell0 = shell;
/*
* If we have no command, execute the shell. In this case, the shell
* this is a login shell.
*/
if (!command) {
- if (!options.use_login) {
- char buf[256];
-
- /* Start the shell. Set initial character to '-'. */
- buf[0] = '-';
- strncpy(buf + 1, cp, sizeof(buf) - 1);
- buf[sizeof(buf) - 1] = 0;
+ char argv0[256];
- /* Execute the shell. */
- argv[0] = buf;
- argv[1] = NULL;
- execve(shell, argv, env);
+ /* Start the shell. Set initial character to '-'. */
+ argv0[0] = '-';
- /* Executing the shell failed. */
+ if (strlcpy(argv0 + 1, shell0, sizeof(argv0) - 1)
+ >= sizeof(argv0) - 1) {
+ errno = EINVAL;
perror(shell);
exit(1);
+ }
- } else {
- /* Launch login(1). */
-
- execl(LOGIN_PROGRAM, "login", "-h", hostname,
-#ifdef LOGIN_NEEDS_TERM
- s->term? s->term : "unknown",
-#endif
- "-p", "-f", "--", pw->pw_name, (char *)NULL);
-
- /* Login couldn't be executed, die. */
+ /* Execute the shell. */
+ argv[0] = argv0;
+ argv[1] = NULL;
+ execve(shell, argv, env);
- perror("login");
- exit(1);
- }
+ /* Executing the shell failed. */
+ perror(shell);
+ exit(1);
}
/*
* Execute the command using the user's shell. This uses the -c
* option to execute the command.
*/
- argv[0] = (char *) cp;
+ argv[0] = (char *) shell0;
argv[1] = "-c";
argv[2] = (char *) command;
argv[3] = NULL;
exit(1);
}
+void
+session_unused(int id)
+{
+ debug3("%s: session id %d unused", __func__, id);
+ if (id >= options.max_sessions ||
+ id >= sessions_nalloc) {
+ fatal("%s: insane session id %d (max %d nalloc %d)",
+ __func__, id, options.max_sessions, sessions_nalloc);
+ }
+ bzero(&sessions[id], sizeof(*sessions));
+ sessions[id].self = id;
+ sessions[id].used = 0;
+ sessions[id].chanid = -1;
+ sessions[id].ptyfd = -1;
+ sessions[id].ttyfd = -1;
+ sessions[id].ptymaster = -1;
+ sessions[id].x11_chanids = NULL;
+ sessions[id].next_unused = sessions_first_unused;
+ sessions_first_unused = id;
+}
+
Session *
session_new(void)
{
- int i;
- static int did_init = 0;
- if (!did_init) {
- debug("session_new: init");
- for(i = 0; i < MAX_SESSIONS; i++) {
- sessions[i].used = 0;
+ Session *s, *tmp;
+
+ if (sessions_first_unused == -1) {
+ if (sessions_nalloc >= options.max_sessions)
+ return NULL;
+ debug2("%s: allocate (allocated %d max %d)",
+ __func__, sessions_nalloc, options.max_sessions);
+ tmp = xrealloc(sessions, sessions_nalloc + 1,
+ sizeof(*sessions));
+ if (tmp == NULL) {
+ error("%s: cannot allocate %d sessions",
+ __func__, sessions_nalloc + 1);
+ return NULL;
}
- did_init = 1;
+ sessions = tmp;
+ session_unused(sessions_nalloc++);
}
- for(i = 0; i < MAX_SESSIONS; i++) {
- Session *s = &sessions[i];
- if (! s->used) {
- memset(s, 0, sizeof(*s));
- s->chanid = -1;
- s->ptyfd = -1;
- s->ttyfd = -1;
- s->used = 1;
- s->self = i;
- debug("session_new: session %d", i);
- return s;
- }
+
+ if (sessions_first_unused >= sessions_nalloc ||
+ sessions_first_unused < 0) {
+ fatal("%s: insane first_unused %d max %d nalloc %d",
+ __func__, sessions_first_unused, options.max_sessions,
+ sessions_nalloc);
}
- return NULL;
+
+ s = &sessions[sessions_first_unused];
+ if (s->used) {
+ fatal("%s: session %d already used",
+ __func__, sessions_first_unused);
+ }
+ sessions_first_unused = s->next_unused;
+ s->used = 1;
+ s->next_unused = -1;
+ debug("session_new: session %d", s->self);
+
+ return s;
}
static void
session_dump(void)
{
int i;
- for(i = 0; i < MAX_SESSIONS; i++) {
+ for (i = 0; i < sessions_nalloc; i++) {
Session *s = &sessions[i];
- debug("dump: used %d session %d %p channel %d pid %d",
+
+ debug("dump: used %d next_unused %d session %d %p "
+ "channel %d pid %ld",
s->used,
+ s->next_unused,
s->self,
s,
s->chanid,
- s->pid);
+ (long)s->pid);
}
}
}
s->authctxt = authctxt;
s->pw = authctxt->pw;
- if (s->pw == NULL)
+ if (s->pw == NULL || !authctxt->valid)
fatal("no user for session %d", s->self);
debug("session_open: session %d: link with channel %d", s->self, chanid);
s->chanid = chanid;
return 1;
}
+Session *
+session_by_tty(char *tty)
+{
+ int i;
+ for (i = 0; i < sessions_nalloc; i++) {
+ Session *s = &sessions[i];
+ if (s->used && s->ttyfd != -1 && strcmp(s->tty, tty) == 0) {
+ debug("session_by_tty: session %d tty %s", i, tty);
+ return s;
+ }
+ }
+ debug("session_by_tty: unknown tty %.100s", tty);
+ session_dump();
+ return NULL;
+}
+
static Session *
session_by_channel(int id)
{
int i;
- for(i = 0; i < MAX_SESSIONS; i++) {
+ for (i = 0; i < sessions_nalloc; i++) {
Session *s = &sessions[i];
if (s->used && s->chanid == id) {
- debug("session_by_channel: session %d channel %d", i, id);
+ debug("session_by_channel: session %d channel %d",
+ i, id);
return s;
}
}
return NULL;
}
+static Session *
+session_by_x11_channel(int id)
+{
+ int i, j;
+
+ for (i = 0; i < sessions_nalloc; i++) {
+ Session *s = &sessions[i];
+
+ if (s->x11_chanids == NULL || !s->used)
+ continue;
+ for (j = 0; s->x11_chanids[j] != -1; j++) {
+ if (s->x11_chanids[j] == id) {
+ debug("session_by_x11_channel: session %d "
+ "channel %d", s->self, id);
+ return s;
+ }
+ }
+ }
+ debug("session_by_x11_channel: unknown channel %d", id);
+ session_dump();
+ return NULL;
+}
+
static Session *
session_by_pid(pid_t pid)
{
int i;
- debug("session_by_pid: pid %d", pid);
- for(i = 0; i < MAX_SESSIONS; i++) {
+ debug("session_by_pid: pid %ld", (long)pid);
+ for (i = 0; i < sessions_nalloc; i++) {
Session *s = &sessions[i];
if (s->used && s->pid == pid)
return s;
}
- error("session_by_pid: unknown pid %d", pid);
+ error("session_by_pid: unknown pid %ld", (long)pid);
session_dump();
return NULL;
}
s->row = packet_get_int();
s->xpixel = packet_get_int();
s->ypixel = packet_get_int();
- packet_done();
+ packet_check_eom();
pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
return 1;
}
/* Allocate a pty and open it. */
debug("Allocating pty.");
- if (!pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty))) {
+ if (!PRIVSEP(pty_allocate(&s->ptyfd, &s->ttyfd, s->tty,
+ sizeof(s->tty)))) {
if (s->term)
xfree(s->term);
s->term = NULL;
n_bytes = packet_remaining();
tty_parse_modes(s->ttyfd, &n_bytes);
- /*
- * Add a cleanup function to clear the utmp entry and record logout
- * time in case we call fatal() (e.g., the connection gets closed).
- */
- fatal_add_cleanup(session_pty_cleanup, (void *)s);
- pty_setowner(s->pw, s->tty);
+ if (!use_privsep)
+ pty_setowner(s->pw, s->tty);
/* Set window size from the packet. */
pty_change_window_size(s->ptyfd, s->row, s->col, s->xpixel, s->ypixel);
- packet_done();
+ packet_check_eom();
session_proctitle(s);
return 1;
}
struct stat st;
u_int len;
int success = 0;
- char *cmd, *subsys = packet_get_string(&len);
- int i;
+ char *prog, *cmd, *subsys = packet_get_string(&len);
+ u_int i;
- packet_done();
- log("subsystem request for %s", subsys);
+ packet_check_eom();
+ logit("subsystem request for %.100s", subsys);
for (i = 0; i < options.num_subsystems; i++) {
if (strcmp(subsys, options.subsystem_name[i]) == 0) {
- cmd = options.subsystem_command[i];
- if (stat(cmd, &st) < 0) {
- error("subsystem: cannot stat %s: %s", cmd,
+ prog = options.subsystem_command[i];
+ cmd = options.subsystem_args[i];
+ if (!strcmp(INTERNAL_SFTP_NAME, prog)) {
+ s->is_subsystem = SUBSYSTEM_INT_SFTP;
+ } else if (stat(prog, &st) < 0) {
+ error("subsystem: cannot stat %s: %s", prog,
strerror(errno));
break;
+ } else {
+ s->is_subsystem = SUBSYSTEM_EXT;
}
debug("subsystem: exec() %s", cmd);
- s->is_subsystem = 1;
- do_exec(s, cmd);
- success = 1;
+ success = do_exec(s, cmd) == 0;
+ break;
}
}
if (!success)
- log("subsystem request for %s failed, subsystem not found",
+ logit("subsystem request for %.100s failed, subsystem not found",
subsys);
xfree(subsys);
{
int success;
+ if (s->auth_proto != NULL || s->auth_data != NULL) {
+ error("session_x11_req: session %d: "
+ "x11 forwarding already active", s->self);
+ return 0;
+ }
s->single_connection = packet_get_char();
s->auth_proto = packet_get_string(NULL);
s->auth_data = packet_get_string(NULL);
s->screen = packet_get_int();
- packet_done();
+ packet_check_eom();
success = session_setup_x11fwd(s);
if (!success) {
static int
session_shell_req(Session *s)
{
- packet_done();
- do_exec(s, NULL);
- return 1;
+ packet_check_eom();
+ return do_exec(s, NULL) == 0;
}
static int
session_exec_req(Session *s)
{
- u_int len;
+ u_int len, success;
+
char *command = packet_get_string(&len);
- packet_done();
- do_exec(s, command);
+ packet_check_eom();
+ success = do_exec(s, command) == 0;
xfree(command);
+ return success;
+}
+
+static int
+session_break_req(Session *s)
+{
+
+ packet_get_int(); /* ignored */
+ packet_check_eom();
+
+ if (s->ttyfd == -1 || tcsendbreak(s->ttyfd, 0) < 0)
+ return 0;
return 1;
}
+static int
+session_env_req(Session *s)
+{
+ char *name, *val;
+ u_int name_len, val_len, i;
+
+ name = packet_get_string(&name_len);
+ val = packet_get_string(&val_len);
+ packet_check_eom();
+
+ /* Don't set too many environment variables */
+ if (s->num_env > 128) {
+ debug2("Ignoring env request %s: too many env vars", name);
+ goto fail;
+ }
+
+ for (i = 0; i < options.num_accept_env; i++) {
+ if (match_pattern(name, options.accept_env[i])) {
+ debug2("Setting env %d: %s=%s", s->num_env, name, val);
+ s->env = xrealloc(s->env, s->num_env + 1,
+ sizeof(*s->env));
+ s->env[s->num_env].name = name;
+ s->env[s->num_env].val = val;
+ s->num_env++;
+ return (1);
+ }
+ }
+ debug2("Ignoring env request %s: disallowed name", name);
+
+ fail:
+ xfree(name);
+ xfree(val);
+ return (0);
+}
+
static int
session_auth_agent_req(Session *s)
{
static int called = 0;
- packet_done();
- if (no_agent_forwarding_flag) {
+ packet_check_eom();
+ if (no_agent_forwarding_flag || !options.allow_agent_forwarding) {
debug("session_auth_agent_req: no_agent_forwarding_flag");
return 0;
}
}
}
-void
-session_input_channel_req(int id, void *arg)
+int
+session_input_channel_req(Channel *c, const char *rtype)
{
- u_int len;
- int reply;
int success = 0;
- char *rtype;
Session *s;
- Channel *c;
- rtype = packet_get_string(&len);
- reply = packet_get_char();
-
- s = session_by_channel(id);
- if (s == NULL)
- fatal("session_input_channel_req: channel %d: no session", id);
- c = channel_lookup(id);
- if (c == NULL)
- fatal("session_input_channel_req: channel %d: bad channel", id);
-
- debug("session_input_channel_req: session %d channel %d request %s reply %d",
- s->self, id, rtype, reply);
+ if ((s = session_by_channel(c->self)) == NULL) {
+ logit("session_input_channel_req: no session %d req %.100s",
+ c->self, rtype);
+ return 0;
+ }
+ debug("session_input_channel_req: session %d req %s", s->self, rtype);
/*
* a session is in LARVAL state until a shell, a command
} else if (strcmp(rtype, "exec") == 0) {
success = session_exec_req(s);
} else if (strcmp(rtype, "pty-req") == 0) {
- success = session_pty_req(s);
+ success = session_pty_req(s);
} else if (strcmp(rtype, "x11-req") == 0) {
success = session_x11_req(s);
} else if (strcmp(rtype, "auth-agent-req@openssh.com") == 0) {
success = session_auth_agent_req(s);
} else if (strcmp(rtype, "subsystem") == 0) {
success = session_subsystem_req(s);
+ } else if (strcmp(rtype, "env") == 0) {
+ success = session_env_req(s);
}
}
if (strcmp(rtype, "window-change") == 0) {
success = session_window_change_req(s);
+ } else if (strcmp(rtype, "break") == 0) {
+ success = session_break_req(s);
}
- if (reply) {
- packet_start(success ?
- SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
- packet_put_int(c->remote_id);
- packet_send();
- }
- xfree(rtype);
+ return success;
}
void
-session_set_fds(Session *s, int fdin, int fdout, int fderr)
+session_set_fds(Session *s, int fdin, int fdout, int fderr, int is_tty)
{
if (!compat20)
fatal("session_set_fds: called for proto != 2.0");
channel_set_fds(s->chanid,
fdout, fdin, fderr,
fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
- 1);
+ 1, is_tty, CHAN_SES_WINDOW_DEFAULT);
}
/*
* Function to perform pty cleanup. Also called if we get aborted abnormally
* (e.g., due to a dropped connection).
*/
-static void
-session_pty_cleanup(void *session)
+void
+session_pty_cleanup2(Session *s)
{
- Session *s = session;
-
if (s == NULL) {
error("session_pty_cleanup: no session");
return;
/* Record that the user has logged out. */
if (s->pid != 0)
- record_logout(s->pid, s->tty);
+ record_logout(s->pid, s->tty, s->pw->pw_name);
/* Release the pseudo-tty. */
- pty_release(s->tty);
+ if (getuid() == 0)
+ pty_release(s->tty);
/*
* Close the server side of the socket pairs. We must do this after
* the pty cleanup, so that another process doesn't get this pty
* while we're still cleaning up.
*/
- if (close(s->ptymaster) < 0)
- error("close(s->ptymaster): %s", strerror(errno));
+ if (s->ptymaster != -1 && close(s->ptymaster) < 0)
+ error("close(s->ptymaster/%d): %s",
+ s->ptymaster, strerror(errno));
/* unlink pty from session */
s->ttyfd = -1;
}
+void
+session_pty_cleanup(Session *s)
+{
+ PRIVSEP(session_pty_cleanup2(s));
+}
+
+static char *
+sig2name(int sig)
+{
+#define SSH_SIG(x) if (sig == SIG ## x) return #x
+ SSH_SIG(ABRT);
+ SSH_SIG(ALRM);
+ SSH_SIG(FPE);
+ SSH_SIG(HUP);
+ SSH_SIG(ILL);
+ SSH_SIG(INT);
+ SSH_SIG(KILL);
+ SSH_SIG(PIPE);
+ SSH_SIG(QUIT);
+ SSH_SIG(SEGV);
+ SSH_SIG(TERM);
+ SSH_SIG(USR1);
+ SSH_SIG(USR2);
+#undef SSH_SIG
+ return "SIG@openssh.com";
+}
+
+static void
+session_close_x11(int id)
+{
+ Channel *c;
+
+ if ((c = channel_by_id(id)) == NULL) {
+ debug("session_close_x11: x11 channel %d missing", id);
+ } else {
+ /* Detach X11 listener */
+ debug("session_close_x11: detach x11 channel %d", id);
+ channel_cancel_cleanup(id);
+ if (c->ostate != CHAN_OUTPUT_CLOSED)
+ chan_mark_dead(c);
+ }
+}
+
+static void
+session_close_single_x11(int id, void *arg)
+{
+ Session *s;
+ u_int i;
+
+ debug3("session_close_single_x11: channel %d", id);
+ channel_cancel_cleanup(id);
+ if ((s = session_by_x11_channel(id)) == NULL)
+ fatal("session_close_single_x11: no x11 channel %d", id);
+ for (i = 0; s->x11_chanids[i] != -1; i++) {
+ debug("session_close_single_x11: session %d: "
+ "closing channel %d", s->self, s->x11_chanids[i]);
+ /*
+ * The channel "id" is already closing, but make sure we
+ * close all of its siblings.
+ */
+ if (s->x11_chanids[i] != id)
+ session_close_x11(s->x11_chanids[i]);
+ }
+ xfree(s->x11_chanids);
+ s->x11_chanids = NULL;
+ if (s->display) {
+ xfree(s->display);
+ s->display = NULL;
+ }
+ if (s->auth_proto) {
+ xfree(s->auth_proto);
+ s->auth_proto = NULL;
+ }
+ if (s->auth_data) {
+ xfree(s->auth_data);
+ s->auth_data = NULL;
+ }
+ if (s->auth_display) {
+ xfree(s->auth_display);
+ s->auth_display = NULL;
+ }
+}
+
static void
session_exit_message(Session *s, int status)
{
Channel *c;
- if (s == NULL)
- fatal("session_close: no session");
- c = channel_lookup(s->chanid);
- if (c == NULL)
+
+ if ((c = channel_lookup(s->chanid)) == NULL)
fatal("session_exit_message: session %d: no channel %d",
s->self, s->chanid);
- debug("session_exit_message: session %d channel %d pid %d",
- s->self, s->chanid, s->pid);
+ debug("session_exit_message: session %d channel %d pid %ld",
+ s->self, s->chanid, (long)s->pid);
if (WIFEXITED(status)) {
- channel_request_start(s->chanid,
- "exit-status", 0);
+ channel_request_start(s->chanid, "exit-status", 0);
packet_put_int(WEXITSTATUS(status));
packet_send();
} else if (WIFSIGNALED(status)) {
- channel_request_start(s->chanid,
- "exit-signal", 0);
- packet_put_int(WTERMSIG(status));
+ channel_request_start(s->chanid, "exit-signal", 0);
+ packet_put_cstring(sig2name(WTERMSIG(status)));
#ifdef WCOREDUMP
- packet_put_char(WCOREDUMP(status));
+ packet_put_char(WCOREDUMP(status)? 1 : 0);
#else /* WCOREDUMP */
packet_put_char(0);
#endif /* WCOREDUMP */
/* disconnect channel */
debug("session_exit_message: release channel %d", s->chanid);
- channel_cancel_cleanup(s->chanid);
+
+ /*
+ * Adjust cleanup callback attachment to send close messages when
+ * the channel gets EOF. The session will be then be closed
+ * by session_close_by_channel when the childs close their fds.
+ */
+ channel_register_cleanup(c->self, session_close_by_channel, 1);
+
/*
* emulate a write failure with 'chan_write_failed', nobody will be
* interested in data we write.
*/
if (c->ostate != CHAN_OUTPUT_CLOSED)
chan_write_failed(c);
- s->chanid = -1;
}
-static void
+void
session_close(Session *s)
{
- debug("session_close: session %d pid %d", s->self, s->pid);
- if (s->ttyfd != -1) {
- fatal_remove_cleanup(session_pty_cleanup, (void *)s);
+ u_int i;
+
+ debug("session_close: session %d pid %ld", s->self, (long)s->pid);
+ if (s->ttyfd != -1)
session_pty_cleanup(s);
- }
if (s->term)
xfree(s->term);
if (s->display)
xfree(s->display);
+ if (s->x11_chanids)
+ xfree(s->x11_chanids);
+ if (s->auth_display)
+ xfree(s->auth_display);
if (s->auth_data)
xfree(s->auth_data);
if (s->auth_proto)
xfree(s->auth_proto);
- s->used = 0;
+ if (s->env != NULL) {
+ for (i = 0; i < s->num_env; i++) {
+ xfree(s->env[i].name);
+ xfree(s->env[i].val);
+ }
+ xfree(s->env);
+ }
session_proctitle(s);
+ session_unused(s->self);
}
void
{
Session *s = session_by_pid(pid);
if (s == NULL) {
- debug("session_close_by_pid: no session for pid %d", pid);
+ debug("session_close_by_pid: no session for pid %ld",
+ (long)pid);
return;
}
if (s->chanid != -1)
session_exit_message(s, status);
- session_close(s);
+ if (s->ttyfd != -1)
+ session_pty_cleanup(s);
+ s->pid = 0;
}
/*
session_close_by_channel(int id, void *arg)
{
Session *s = session_by_channel(id);
+ u_int i;
+
if (s == NULL) {
debug("session_close_by_channel: no session for id %d", id);
return;
}
- debug("session_close_by_channel: channel %d child %d", id, s->pid);
+ debug("session_close_by_channel: channel %d child %ld",
+ id, (long)s->pid);
if (s->pid != 0) {
debug("session_close_by_channel: channel %d: has child", id);
/*
* delay detach of session, but release pty, since
* the fd's to the child are already closed
*/
- if (s->ttyfd != -1) {
- fatal_remove_cleanup(session_pty_cleanup, (void *)s);
+ if (s->ttyfd != -1)
session_pty_cleanup(s);
- }
return;
}
/* detach by removing callback */
channel_cancel_cleanup(s->chanid);
+
+ /* Close any X11 listeners associated with this session */
+ if (s->x11_chanids != NULL) {
+ for (i = 0; s->x11_chanids[i] != -1; i++) {
+ session_close_x11(s->x11_chanids[i]);
+ s->x11_chanids[i] = -1;
+ }
+ }
+
s->chanid = -1;
session_close(s);
}
void
-session_destroy_all(void)
+session_destroy_all(void (*closefunc)(Session *))
{
int i;
- for(i = 0; i < MAX_SESSIONS; i++) {
+ for (i = 0; i < sessions_nalloc; i++) {
Session *s = &sessions[i];
- if (s->used)
- session_close(s);
+ if (s->used) {
+ if (closefunc != NULL)
+ closefunc(s);
+ else
+ session_close(s);
+ }
}
}
{
static char buf[1024];
int i;
+ char *cp;
+
buf[0] = '\0';
- for(i = 0; i < MAX_SESSIONS; i++) {
+ for (i = 0; i < sessions_nalloc; i++) {
Session *s = &sessions[i];
if (s->used && s->ttyfd != -1) {
+
+ if (strncmp(s->tty, "/dev/", 5) != 0) {
+ cp = strrchr(s->tty, '/');
+ cp = (cp == NULL) ? s->tty : cp + 1;
+ } else
+ cp = s->tty + 5;
+
if (buf[0] != '\0')
strlcat(buf, ",", sizeof buf);
- strlcat(buf, strrchr(s->tty, '/') + 1, sizeof buf);
+ strlcat(buf, cp, sizeof buf);
}
}
if (buf[0] == '\0')
session_setup_x11fwd(Session *s)
{
struct stat st;
+ char display[512], auth_display[512];
+ char hostname[MAXHOSTNAMELEN];
+ u_int i;
if (no_x11_forwarding_flag) {
packet_send_debug("X11 forwarding disabled in user configuration file.");
debug("X11 display already set.");
return 0;
}
- s->display = x11_create_display_inet(s->screen, options.x11_display_offset);
- if (s->display == NULL) {
+ if (x11_create_display_inet(options.x11_display_offset,
+ options.x11_use_localhost, s->single_connection,
+ &s->display_number, &s->x11_chanids) == -1) {
debug("x11_create_display_inet failed.");
return 0;
}
+ for (i = 0; s->x11_chanids[i] != -1; i++) {
+ channel_register_cleanup(s->x11_chanids[i],
+ session_close_single_x11, 0);
+ }
+
+ /* Set up a suitable value for the DISPLAY variable. */
+ if (gethostname(hostname, sizeof(hostname)) < 0)
+ fatal("gethostname: %.100s", strerror(errno));
+ /*
+ * auth_display must be used as the displayname when the
+ * authorization entry is added with xauth(1). This will be
+ * different than the DISPLAY string for localhost displays.
+ */
+ if (options.x11_use_localhost) {
+ snprintf(display, sizeof display, "localhost:%u.%u",
+ s->display_number, s->screen);
+ snprintf(auth_display, sizeof auth_display, "unix:%u.%u",
+ s->display_number, s->screen);
+ s->display = xstrdup(display);
+ s->auth_display = xstrdup(auth_display);
+ } else {
+#ifdef IPADDR_IN_DISPLAY
+ struct hostent *he;
+ struct in_addr my_addr;
+
+ he = gethostbyname(hostname);
+ if (he == NULL) {
+ error("Can't get IP address for X11 DISPLAY.");
+ packet_send_debug("Can't get IP address for X11 DISPLAY.");
+ return 0;
+ }
+ memcpy(&my_addr, he->h_addr_list[0], sizeof(struct in_addr));
+ snprintf(display, sizeof display, "%.50s:%u.%u", inet_ntoa(my_addr),
+ s->display_number, s->screen);
+#else
+ snprintf(display, sizeof display, "%.400s:%u.%u", hostname,
+ s->display_number, s->screen);
+#endif
+ s->display = xstrdup(display);
+ s->auth_display = xstrdup(display);
+ }
+
return 1;
}
{
server_loop2(authctxt);
}
+
+void
+do_cleanup(Authctxt *authctxt)
+{
+ static int called = 0;
+
+ debug("do_cleanup");
+
+ /* no cleanup if we're in the child for login shell */
+ if (is_child)
+ return;
+
+ /* avoid double cleanup */
+ if (called)
+ return;
+ called = 1;
+
+ if (authctxt == NULL)
+ return;
+
+#ifdef USE_PAM
+ if (options.use_pam) {
+ sshpam_cleanup();
+ sshpam_thread_cleanup();
+ }
+#endif
+
+ if (!authctxt->authenticated)
+ return;
+
+#ifdef KRB5
+ if (options.kerberos_ticket_cleanup &&
+ authctxt->krb5_ctx)
+ krb5_cleanup_proc(authctxt);
+#endif
+
+#ifdef GSSAPI
+ if (compat20 && options.gss_cleanup_creds)
+ ssh_gssapi_cleanup_creds();
+#endif
+
+ /* remove agent socket */
+ auth_sock_cleanup_proc(authctxt->pw);
+
+ /*
+ * Cleanup ptys/utmp only if privsep is disabled,
+ * or if running in monitor.
+ */
+ if (!use_privsep || mm_is_monitor())
+ session_destroy_all(session_pty_cleanup2);
+}
andersk / gssapi-openssh.git / blobdiff