+/* $OpenBSD: session.c,v 1.221 2007/01/21 01:41:54 stevesk Exp $ */
/*
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
*/
#include "includes.h"
-RCSID("$OpenBSD: session.c,v 1.172 2004/01/30 09:48:57 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 "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 "serverloop.h"
#include "canohost.h"
#include "session.h"
+#include "kex.h"
#include "monitor_wrap.h"
#if defined(KRB5) && defined(USE_AFS)
#include <kafs.h>
#endif
-#ifdef GSSAPI
-#include "ssh-gss.h"
-#endif
-
/* func */
Session *session_new(void);
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)
+ if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) < 0)
packet_disconnect("bind: %.100s", strerror(errno));
/* Restore the privileged uid. */
{
if (buffer_len(&loginmsg) > 0) {
buffer_append(&loginmsg, "\0", 1);
- printf("%s\n", (char *)buffer_ptr(&loginmsg));
+ printf("%s", (char *)buffer_ptr(&loginmsg));
buffer_clear(&loginmsg);
}
}
{
setproctitle("%s", authctxt->pw->pw_name);
- /*
- * Cancel the alarm we set to limit the time taken for
- * authentication.
- */
- alarm(0);
- if (startup_pipe != -1) {
- close(startup_pipe);
- startup_pipe = -1;
- }
/* setup the channel layer */
if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
channel_permit_all_opens();
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;
compression_level = packet_get_int();
packet_check_eom();
if (compression_level < 1 || compression_level > 9) {
- packet_send_debug("Received illegal compression level %d.",
+ packet_send_debug("Received invalid compression level %d.",
compression_level);
break;
}
- if (!options.compression) {
+ if (options.compression == COMP_NONE) {
debug2("compression disabled");
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;
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]);
} else {
/* Enter the interactive session. */
server_loop(pid, pin[1], pout[0], perr[0]);
close(inout[0]);
close(err[0]);
+ /*
+ * 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);
+
/*
* Enter the interactive session. Note: server_loop must be able to
* handle the case that fdin and fdout are the same.
fromlen = sizeof(from);
if (packet_connection_is_on_socket()) {
if (getpeername(packet_get_connection_in(),
- (struct sockaddr *) & from, &fromlen) < 0) {
+ (struct sockaddr *)&from, &fromlen) < 0) {
debug("getpeername: %.100s", strerror(errno));
cleanup_exit(255);
}
void
do_exec(Session *s, const char *command)
{
- if (forced_command) {
+ if (options.adm_forced_command) {
+ original_command = command;
+ command = options.adm_forced_command;
+ debug("Forced command (config) '%.900s'", command);
+ } else if (forced_command) {
original_command = command;
command = forced_command;
- debug("Forced command '%.900s'", command);
+ debug("Forced command (key option) '%.900s'", command);
}
-#ifdef GSSAPI
- if (options.gss_authentication) {
- temporarily_use_uid(s->pw);
- ssh_gssapi_storecreds();
- restore_uid();
+#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
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);
+}
/* administrative, login(1)-like work */
void
do_login(Session *s, const char *command)
{
- char *time_string;
socklen_t fromlen;
struct sockaddr_storage from;
struct passwd * pw = s->pw;
display_loginmsg();
-#ifndef NO_SSH_LASTLOG
- if (options.print_lastlog && s->last_login_time != 0) {
- time_string = ctime(&s->last_login_time);
- if (strchr(time_string, '\n'))
- *strchr(time_string, '\n') = 0;
- if (strcmp(s->hostname, "") == 0)
- printf("Last login: %s\r\n", time_string);
- else
- printf("Last login: %s from %s\r\n", time_string,
- s->hostname);
- }
-#endif /* NO_SSH_LASTLOG */
-
do_motd();
}
if (envsize >= 1000)
fatal("child_set_env: too many env vars");
envsize += 50;
- env = (*envp) = xrealloc(env, envsize * sizeof(char *));
+ env = (*envp) = xrealloc(env, envsize, sizeof(char *));
*envsizep = envsize;
}
/* Need to set the NULL pointer at end of array beyond the new slot. */
}
#endif /* HAVE_ETC_DEFAULT_LOGIN */
-void copy_environment(char **source, char ***env, u_int *envsize)
+void
+copy_environment(char **source, char ***env, u_int *envsize)
{
char *var_name, *var_val;
int i;
{
char buf[256];
u_int i, envsize;
- char **env, *laddr, *path = NULL;
+ char **env, *laddr;
struct passwd *pw = s->pw;
+#ifndef HAVE_LOGIN_CAP
+ char *path = NULL;
+#endif
/* Initialize the environment. */
envsize = 100;
- env = xmalloc(envsize * sizeof(char *));
+ env = xcalloc(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(environ, &env, &envsize);
+ {
+ char **p;
+
+ p = fetch_windows_environment();
+ copy_environment(p, &env, &envsize);
+ free_windows_environment(p);
+ }
#endif
#ifdef GSSAPI
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, "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
{
char *cp;
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 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
/*
# ifdef __bsdi__
setpgid(0, 0);
# endif
+#ifdef GSSAPI
+ if (options.gss_authentication) {
+ temporarily_use_uid(pw);
+ ssh_gssapi_storecreds();
+ restore_uid();
+ }
+#endif
# ifdef USE_PAM
if (options.use_pam) {
do_pam_session();
exit(1);
}
endgrent();
+#ifdef GSSAPI
+ if (options.gss_authentication) {
+ temporarily_use_uid(pw);
+ ssh_gssapi_storecreds();
+ restore_uid();
+ }
+#endif
# ifdef USE_PAM
/*
* PAM credentials may take the form of supplementary groups.
# ifdef _AIX
aix_usrinfo(pw);
# endif /* _AIX */
+#if defined(HAVE_LIBIAF) && !defined(BROKEN_LIBIAF)
+ if (set_id(pw->pw_name) != 0) {
+ exit(1);
+ }
+#endif /* HAVE_LIBIAF && !BROKEN_LIBIAF */
/* Permanently switch to the desired uid. */
permanently_set_uid(pw);
#endif
#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,
+ 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,
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.
if (!check_quietlogin(s, command))
do_motd();
#else /* HAVE_OSF_SIA */
- do_nologin(pw);
+ /* 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.
*/
if (options.kerberos_get_afs_token && k_hasafs() &&
- (s->authctxt->krb5_ctx != NULL)) {
+ (s->authctxt->krb5_ctx != NULL)) {
char cell[64];
debug("Getting AFS token");
}
#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));
do_rc_files(s, shell);
/* restore SIGPIPE for child */
- signal(SIGPIPE, SIG_DFL);
+ signal(SIGPIPE, SIG_DFL);
if (options.use_login) {
launch_login(pw, hostname);
s->ttyfd = -1;
s->used = 1;
s->self = i;
+ s->x11_chanids = NULL;
debug("session_new: session %d", i);
return s;
}
return NULL;
}
+static Session *
+session_by_x11_channel(int id)
+{
+ int i, j;
+
+ for (i = 0; i < MAX_SESSIONS; 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)
{
packet_disconnect("Protocol error: you already have a pty.");
return 0;
}
- /* Get the time and hostname when the user last logged in. */
- if (options.print_lastlog) {
- s->hostname[0] = '\0';
- s->last_login_time = get_last_login_time(s->pw->pw_uid,
- s->pw->pw_name, s->hostname, sizeof(s->hostname));
- }
s->term = packet_get_string(&len);
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_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 (stat(prog, &st) < 0) {
+ error("subsystem: cannot stat %s: %s", prog,
strerror(errno));
break;
}
{
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);
static int
session_break_req(Session *s)
{
- u_int break_length;
- break_length = packet_get_int(); /* ignored */
+ packet_get_int(); /* ignored */
packet_check_eom();
if (s->ttyfd == -1 ||
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)
{
} 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, "break") == 0) {
- success = session_break_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);
}
+
return success;
}
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)
{
/* 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;
}
void
session_close(Session *s)
{
+ u_int i;
+
debug("session_close: session %d pid %ld", s->self, (long)s->pid);
if (s->ttyfd != -1)
session_pty_cleanup(s);
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)
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);
}
}
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;
}
/* 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);
}
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.");
}
if (x11_create_display_inet(options.x11_display_offset,
options.x11_use_localhost, s->single_connection,
- &s->display_number) == -1) {
+ &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)
return;
called = 1;
- if (authctxt == NULL)
+ if (authctxt == NULL || !authctxt->authenticated)
return;
#ifdef KRB5
if (options.kerberos_ticket_cleanup &&
andersk / gssapi-openssh.git / blobdiff