/*
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
- */
-/*
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose. Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ *
* SSH2 support by Markus Friedl.
* Copyright (c) 2000 Markus Friedl. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "includes.h"
-RCSID("$OpenBSD: session.c,v 1.29 2000/08/21 16:23:31 millert Exp $");
+RCSID("$OpenBSD: session.c,v 1.49 2001/01/18 17:00:00 markus Exp $");
#include "xmalloc.h"
#include "ssh.h"
#include "pty.h"
#include "packet.h"
#include "buffer.h"
-#include "cipher.h"
#include "mpaux.h"
#include "servconf.h"
#include "uidswap.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>
# include <siad.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"
void session_proctitle(Session *s);
void do_exec_pty(Session *s, const char *command, struct passwd * pw);
void do_exec_no_pty(Session *s, const char *command, struct passwd * pw);
-void do_login(Session *s);
+void do_login(Session *s, const char *command);
void
do_child(const char *command, struct passwd * pw, const char *term,
/* import */
extern ServerOptions options;
-#ifdef HAVE___PROGNAME
extern char *__progname;
-#else /* HAVE___PROGNAME */
-static const char *__progname = "sshd";
-#endif /* HAVE___PROGNAME */
-
extern int log_stderr;
extern int debug_flag;
-extern unsigned int utmp_len;
+extern u_int utmp_len;
extern int startup_pipe;
/* Local Xauthority file. */
static char *xauthfile;
+/* original command from peer. */
+char *original_command = NULL;
+
/* data */
#define MAX_SESSIONS 10
Session sessions[MAX_SESSIONS];
+
#ifdef WITH_AIXAUTHENTICATE
/* AIX's lastlogin message, set in auth1.c */
char *aixloginmsg;
do_authenticated(struct passwd * pw)
{
Session *s;
- int type;
+ int type, fd;
int compression_level = 0, enable_compression_after_reply = 0;
int have_pty = 0;
char *command;
int n_bytes;
int plen;
- unsigned int proto_len, data_len, dlen;
+ u_int proto_len, data_len, dlen;
/*
* Cancel the alarm we set to limit the time taken for
* by the client telling us, so we can equally well trust the client
* not to request anything bogus.)
*/
- if (!no_port_forwarding_flag)
+ if (!no_port_forwarding_flag && options.allow_tcp_forwarding)
channel_permit_all_opens();
s = session_new();
s->pw = pw;
-#ifdef HAVE_LOGIN_CAP
+#if defined(HAVE_LOGIN_CAP) && defined(HAVE_PW_CLASS_IN_PASSWD)
if ((lc = login_getclass(pw->pw_class)) == NULL) {
error("unable to get login class");
return;
break;
}
strlcat(xauthfile, "/cookies", MAXPATHLEN);
- open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
+ fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
+ if (fd >= 0)
+ close(fd);
restore_uid();
fatal_add_cleanup(xauthfile_cleanup_proc, NULL);
success = 1;
debug("Port forwarding not permitted for this authentication.");
break;
}
+ if (!options.allow_tcp_forwarding) {
+ debug("Port forwarding not permitted.");
+ break;
+ }
debug("Received TCP/IP port forwarding request.");
channel_input_port_forward_request(pw->pw_uid == 0, options.gateway_ports);
success = 1;
case SSH_CMSG_EXEC_SHELL:
case SSH_CMSG_EXEC_CMD:
- /* Set interactive/non-interactive mode. */
- packet_set_interactive(have_pty || s->display != NULL,
- options.keepalives);
-
if (type == SSH_CMSG_EXEC_CMD) {
command = packet_get_string(&dlen);
debug("Exec command '%.500s'", command);
packet_integrity_check(plen, 0, type);
}
if (forced_command != NULL) {
+ original_command = command;
command = forced_command;
debug("Forced command '%.500s'", forced_command);
}
/* Child. Reinitialize the log since the pid has changed. */
log_init(__progname, options.log_level, options.log_facility, log_stderr);
+ signal(SIGPIPE, SIG_DFL);
+
/*
* Create a new session and process group since the 4.4BSD
* setlogin() affects the entire process group.
do_child(command, pw, NULL, s->display, s->auth_proto, s->auth_data, NULL);
/* NOTREACHED */
}
+#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);
#ifdef USE_PIPES
/* We are the parent. Close the child sides of the pipes. */
close(pin[0]);
/* Child. Reinitialize the log because the pid has changed. */
log_init(__progname, options.log_level, options.log_facility, log_stderr);
+ signal(SIGPIPE, SIG_DFL);
+
/* Close the master side of the pseudo tty. */
close(ptyfd);
close(ttyfd);
/* record login, etc. similar to login(1) */
- if (command == NULL && !options.use_login)
- do_login(s);
+ if (!(options.use_login && command == NULL))
+ do_login(s, command);
/* Do common processing for the child, such as execing the command. */
do_child(command, pw, s->term, s->display, s->auth_proto,
s->auth_data, s->tty);
/* NOTREACHED */
}
+#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;
s->ptymaster = ptymaster;
/* Enter interactive session. */
+ packet_set_interactive(1);
if (compat20) {
session_set_fds(s, ptyfd, fdout, -1);
} else {
/* administrative, login(1)-like work */
void
-do_login(Session *s)
+do_login(Session *s, const char *command)
{
FILE *f;
char *time_string;
char buf[256];
+ char hostname[MAXHOSTNAMELEN];
socklen_t fromlen;
struct sockaddr_storage from;
struct stat st;
}
}
+ /* Get the time and hostname when the user last logged in. */
+ 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(), (struct sockaddr *)&from);
- /* Done if .hushlogin exists. */
+#ifdef USE_PAM
+ /*
+ * If password change is needed, do it now.
+ * This needs to occur before the ~/.hushlogin check.
+ */
+ if (pam_password_change_required()) {
+ print_pam_messages();
+ do_pam_chauthtok();
+ }
+#endif
+
+ /* Done if .hushlogin exists or a command given. */
+ if (command != NULL)
+ return;
snprintf(buf, sizeof(buf), "%.200s/.hushlogin", pw->pw_dir);
#ifdef HAVE_LOGIN_CAP
if (login_getcapbool(lc, "hushlogin", 0) || stat(buf, &st) >= 0)
return;
#ifdef USE_PAM
- print_pam_messages();
+ if (!pam_password_change_required())
+ print_pam_messages();
#endif /* USE_PAM */
#ifdef WITH_AIXAUTHENTICATE
if (aixloginmsg && *aixloginmsg)
printf("%s\n", aixloginmsg);
#endif /* WITH_AIXAUTHENTICATE */
- /*
- * Get the time when the user last logged in. 'buf' will be set
- * to contain the hostname the last login was from.
- */
- last_login_time = get_last_login_time(pw->pw_uid, pw->pw_name,
- buf, sizeof(buf));
if (last_login_time != 0) {
time_string = ctime(&last_login_time);
if (strchr(time_string, '\n'))
*strchr(time_string, '\n') = 0;
- if (strcmp(buf, "") == 0)
+ if (strcmp(hostname, "") == 0)
printf("Last login: %s\r\n", time_string);
else
- printf("Last login: %s from %s\r\n", time_string, buf);
+ printf("Last login: %s from %s\r\n", time_string, hostname);
}
if (options.print_motd) {
#ifdef HAVE_LOGIN_CAP
* already exists, its value is overriden.
*/
void
-child_set_env(char ***envp, unsigned int *envsizep, const char *name,
+child_set_env(char ***envp, u_int *envsizep, const char *name,
const char *value)
{
- unsigned int i, namelen;
+ u_int i, namelen;
char **env;
/*
* and assignments of the form name=value. No other forms are allowed.
*/
void
-read_environment_file(char ***env, unsigned int *envsize,
+read_environment_file(char ***env, u_int *envsize,
const char *filename)
{
FILE *f;
strncpy(var_name, pam_env[i], equals - pam_env[i]);
strcpy(var_val, equals + 1);
- debug("PAM environment: %s=%s", var_name, var_val);
+ debug3("PAM environment: %s=%s", var_name, var_val);
child_set_env(env, envsize, var_name, var_val);
}
}
#endif /* USE_PAM */
+
+#ifdef HAVE_CYGWIN
+void copy_environment(char ***env, int *envsize)
+{
+ char *equals, var_name[512], var_val[512];
+ 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));
+
+ strncpy(var_name, environ[i], equals - environ[i]);
+ strcpy(var_val, equals + 1);
+
+ debug3("Copy environment: %s=%s", var_name, var_val);
+
+ child_set_env(env, envsize, var_name, var_val);
+ }
+ }
+}
+#endif
+
#if defined(HAVE_GETUSERATTR)
/*
* AIX-specific login initialisation
const char *display, const char *auth_proto,
const char *auth_data, const char *ttyname)
{
- const char *shell, *hostname, *cp = NULL;
+ const char *shell, *hostname = NULL, *cp = NULL;
char buf[256];
char cmd[1024];
FILE *f = NULL;
- unsigned int envsize, i;
+ u_int envsize, i;
char **env;
extern char **environ;
struct stat st;
#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 */
+
/* login(1) is only called if we execute the login shell */
if (options.use_login && command != NULL)
exit(1);
}
#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 */
exit(1);
}
endgrent();
+# 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 (newarraysess() != 0)
- fatal("Failed to set up new array session: %.100s",
- strerror(errno));
+ 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 */
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 */
+
/* Permanently switch to the desired uid. */
permanently_set_uid(pw->pw_uid);
# 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 %d.", (int) 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
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
+
if (!options.use_login) {
/* Set basic environment. */
child_set_env(&env, &envsize, "USER", pw->pw_name);
#ifdef HAVE_LOGIN_CAP
(void) setusercontext(lc, pw, pw->pw_uid, LOGIN_SETPATH);
child_set_env(&env, &envsize, "PATH", getenv("PATH"));
-#else
+#else /* HAVE_LOGIN_CAP */
+# ifndef HAVE_CYGWIN
+ /*
+ * There's no standard path on Windows. The path contains
+ * important components pointing to the system directories,
+ * needed for loading shared libraries. So the path better
+ * remains intact here.
+ */
child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
-#endif
+# endif /* HAVE_CYGWIN */
+#endif /* HAVE_LOGIN_CAP */
snprintf(buf, sizeof buf, "%.200s/%.50s",
_PATH_MAILDIR, pw->pw_name);
child_set_env(&env, &envsize, "TERM", term);
if (display)
child_set_env(&env, &envsize, "DISPLAY", display);
+ if (original_command)
+ child_set_env(&env, &envsize, "SSH_ORIGINAL_COMMAND",
+ original_command);
#ifdef _AIX
- {
- char *authstate,*krb5cc;
-
- if ((authstate = getenv("AUTHSTATE")) != NULL)
- child_set_env(&env,&envsize,"AUTHSTATE",authstate);
-
- if ((krb5cc = getenv("KRB5CCNAME")) != NULL)
- child_set_env(&env,&envsize,"KRB5CCNAME",krb5cc);
- }
+ 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
do_pam_environment(&env, &envsize);
#endif /* USE_PAM */
- read_environment_file(&env,&envsize,"/etc/environment");
-
if (xauthfile)
child_set_env(&env, &envsize, "XAUTHORITY", xauthfile);
if (auth_get_socket_name() != NULL)
if (!options.use_login) {
if (stat(SSH_USER_RC, &st) >= 0) {
if (debug_flag)
- fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_USER_RC);
+ fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, SSH_USER_RC);
f = popen(_PATH_BSHELL " " SSH_USER_RC, "w");
if (f) {
fprintf(stderr, "Could not run %s\n", SSH_USER_RC);
} else if (stat(SSH_SYSTEM_RC, &st) >= 0) {
if (debug_flag)
- fprintf(stderr, "Running "_PATH_BSHELL" %s\n", SSH_SYSTEM_RC);
+ fprintf(stderr, "Running %s %s\n", _PATH_BSHELL, SSH_SYSTEM_RC);
f = popen(_PATH_BSHELL " " SSH_SYSTEM_RC, "w");
if (f) {
"Running %.100s add %.100s %.100s %.100s\n",
options.xauth_location, display,
auth_proto, auth_data);
+#ifndef HAVE_CYGWIN /* Unix sockets are not supported */
if (screen != NULL)
fprintf(stderr,
"Adding %.*s/unix%s %s %s\n",
- screen-display, display,
+ (int)(screen-display), display,
screen, auth_proto, auth_data);
+#endif
}
snprintf(cmd, sizeof cmd, "%s -q -",
options.xauth_location);
if (f) {
fprintf(f, "add %s %s %s\n", display,
auth_proto, auth_data);
+#ifndef HAVE_CYGWIN /* Unix sockets are not supported */
if (screen != NULL)
fprintf(f, "add %.*s/unix%s %s %s\n",
- screen-display, display,
+ (int)(screen-display), display,
screen, auth_proto, auth_data);
+#endif
pclose(f);
} else {
fprintf(stderr, "Could not run %s\n",
int
session_pty_req(Session *s)
{
- unsigned int len;
+ u_int len;
char *term_modes; /* encoded terminal modes */
if (no_pty_flag)
int
session_subsystem_req(Session *s)
{
- unsigned int len;
+ u_int len;
int success = 0;
char *subsys = packet_get_string(&len);
int i;
int
session_x11_req(Session *s)
{
+ int fd;
if (no_x11_forwarding_flag) {
debug("X11 forwarding disabled in user configuration file.");
return 0;
return 0;
}
strlcat(xauthfile, "/cookies", MAXPATHLEN);
- open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
+ fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
+ if (fd >= 0)
+ close(fd);
restore_uid();
fatal_add_cleanup(xauthfile_cleanup_proc, s);
return 1;
int
session_exec_req(Session *s)
{
- unsigned int len;
+ u_int len;
char *command = packet_get_string(&len);
packet_done();
if (forced_command) {
- xfree(command);
+ original_command = command;
command = forced_command;
debug("Forced command '%.500s'", forced_command);
}
return 1;
}
+int
+session_auth_agent_req(Session *s)
+{
+ static int called = 0;
+ packet_done();
+ if (no_agent_forwarding_flag) {
+ debug("session_auth_agent_req: no_agent_forwarding_flag");
+ return 0;
+ }
+ if (called) {
+ return 0;
+ } else {
+ called = 1;
+ return auth_input_request_forwarding(s->pw);
+ }
+}
+
void
session_input_channel_req(int id, void *arg)
{
- unsigned int len;
+ u_int len;
int reply;
int success = 0;
char *rtype;
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);
}
fatal("no channel for session %d", s->self);
channel_set_fds(s->chanid,
fdout, fdin, fderr,
- fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ);
+ fderr == -1 ? CHAN_EXTENDED_IGNORE : CHAN_EXTENDED_READ,
+ 1);
}
void
}
void
-do_authenticated2(void)
+do_authenticated2(Authctxt *authctxt)
{
- struct passwd *pw;
/*
* Cancel the alarm we set to limit the time taken for
close(startup_pipe);
startup_pipe = -1;
}
-#ifdef HAVE_LOGIN_CAP
- pw = auth_get_user();
- if ((lc = login_getclass(pw->pw_class)) == NULL) {
+#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;
}
andersk / openssh.git / blobdiff