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Diffstat (limited to 'usr.bin/ssh/session.c')
-rw-r--r--usr.bin/ssh/session.c159
1 files changed, 64 insertions, 95 deletions
diff --git a/usr.bin/ssh/session.c b/usr.bin/ssh/session.c
index e4e53b9f162..26609d9d038 100644
--- a/usr.bin/ssh/session.c
+++ b/usr.bin/ssh/session.c
@@ -33,7 +33,7 @@
*/
#include "includes.h"
-RCSID("$OpenBSD: session.c,v 1.80 2001/06/04 21:59:43 markus Exp $");
+RCSID("$OpenBSD: session.c,v 1.81 2001/06/04 23:16:16 markus Exp $");
#include "ssh.h"
#include "ssh1.h"
@@ -88,6 +88,7 @@ Session *session_new(void);
void session_set_fds(Session *s, int fdin, int fdout, int fderr);
void session_pty_cleanup(Session *s);
void session_proctitle(Session *s);
+int session_setup_x11fwd(Session *s);
void do_exec_pty(Session *s, const char *command);
void do_exec_no_pty(Session *s, const char *command);
void do_login(Session *s, const char *command);
@@ -218,10 +219,9 @@ do_authenticated1(Authctxt *authctxt)
{
Session *s;
char *command;
- int success, type, fd, n_bytes, plen, screen_flag, have_pty = 0;
+ int success, type, n_bytes, plen, screen_flag, have_pty = 0;
int compression_level = 0, enable_compression_after_reply = 0;
u_int proto_len, data_len, dlen;
- struct stat st;
s = session_new();
s->pw = authctxt->pw;
@@ -300,23 +300,6 @@ do_authenticated1(Authctxt *authctxt)
break;
case SSH_CMSG_X11_REQUEST_FORWARDING:
- if (!options.x11_forwarding) {
- packet_send_debug("X11 forwarding disabled in server configuration file.");
- break;
- }
- if (!options.xauth_location ||
- (stat(options.xauth_location, &st) == -1)) {
- packet_send_debug("No xauth program; cannot forward with spoofing.");
- break;
- }
- if (no_x11_forwarding_flag) {
- packet_send_debug("X11 forwarding not permitted for this authentication.");
- break;
- }
- debug("Received request for X11 forwarding with auth spoofing.");
- if (s->display != NULL)
- packet_disconnect("Protocol error: X11 display already set.");
-
s->auth_proto = packet_get_string(&proto_len);
s->auth_data = packet_get_string(&data_len);
@@ -328,39 +311,16 @@ do_authenticated1(Authctxt *authctxt)
if (!screen_flag)
debug2("Buggy client: "
"X11 screen flag missing");
- packet_integrity_check(plen,
- 4 + proto_len + 4 + data_len + 4, type);
s->screen = packet_get_int();
} else {
- packet_integrity_check(plen,
- 4 + proto_len + 4 + data_len, type);
s->screen = 0;
}
- s->display = x11_create_display_inet(s->screen, options.x11_display_offset);
-
- if (s->display == NULL)
- break;
-
- /* Setup to always have a local .Xauthority. */
- xauthfile = xmalloc(MAXPATHLEN);
- strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
- temporarily_use_uid(s->pw);
- if (mkdtemp(xauthfile) == NULL) {
- restore_uid();
- error("private X11 dir: mkdtemp %s failed: %s",
- xauthfile, strerror(errno));
- xfree(xauthfile);
- xauthfile = NULL;
- /* XXXX remove listening channels */
- break;
+ packet_done();
+ success = session_setup_x11fwd(s);
+ if (!success) {
+ xfree(s->auth_proto);
+ xfree(s->auth_data);
}
- strlcat(xauthfile, "/cookies", MAXPATHLEN);
- fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
- if (fd >= 0)
- close(fd);
- restore_uid();
- fatal_add_cleanup(xauthfile_cleanup_proc, s->pw);
- success = 1;
break;
case SSH_CMSG_AGENT_REQUEST_FORWARDING:
@@ -1381,29 +1341,7 @@ session_subsystem_req(Session *s)
int
session_x11_req(Session *s)
{
- int fd;
- struct stat st;
- if (no_x11_forwarding_flag) {
- debug("X11 forwarding disabled in user configuration file.");
- return 0;
- }
- if (!options.x11_forwarding) {
- debug("X11 forwarding disabled in server configuration file.");
- return 0;
- }
- if (!options.xauth_location ||
- (stat(options.xauth_location, &st) == -1)) {
- packet_send_debug("No xauth program; cannot forward with spoofing.");
- return 0;
- }
- if (xauthfile != NULL) {
- debug("X11 fwd already started.");
- return 0;
- }
-
- debug("Received request for X11 forwarding with auth spoofing.");
- if (s->display != NULL)
- packet_disconnect("Protocol error: X11 display already set.");
+ int success;
s->single_connection = packet_get_char();
s->auth_proto = packet_get_string(NULL);
@@ -1411,33 +1349,12 @@ session_x11_req(Session *s)
s->screen = packet_get_int();
packet_done();
- s->display = x11_create_display_inet(s->screen, options.x11_display_offset);
- if (s->display == NULL) {
+ success = session_setup_x11fwd(s);
+ if (!success) {
xfree(s->auth_proto);
xfree(s->auth_data);
- return 0;
}
- xauthfile = xmalloc(MAXPATHLEN);
- strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
- temporarily_use_uid(s->pw);
- if (mkdtemp(xauthfile) == NULL) {
- restore_uid();
- error("private X11 dir: mkdtemp %s failed: %s",
- xauthfile, strerror(errno));
- xfree(xauthfile);
- xauthfile = NULL;
- xfree(s->auth_proto);
- xfree(s->auth_data);
- /* XXXX remove listening channels */
- return 0;
- }
- strlcat(xauthfile, "/cookies", MAXPATHLEN);
- fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
- if (fd >= 0)
- close(fd);
- restore_uid();
- fatal_add_cleanup(xauthfile_cleanup_proc, s->pw);
- return 1;
+ return success;
}
int
@@ -1651,6 +1568,10 @@ session_free(Session *s)
void
session_close(Session *s)
{
+ if (s->display) {
+ xauthfile_cleanup_proc(s->pw);
+ fatal_remove_cleanup(xauthfile_cleanup_proc, s->pw);
+ }
session_pty_cleanup(s);
session_free(s);
session_proctitle(s);
@@ -1725,6 +1646,54 @@ session_proctitle(Session *s)
setproctitle("%s@%s", s->pw->pw_name, session_tty_list());
}
+int
+session_setup_x11fwd(Session *s)
+{
+ int fd;
+ struct stat st;
+
+ if (no_x11_forwarding_flag) {
+ packet_send_debug("X11 forwarding disabled in user configuration file.");
+ return 0;
+ }
+ if (!options.x11_forwarding) {
+ debug("X11 forwarding disabled in server configuration file.");
+ return 0;
+ }
+ if (!options.xauth_location ||
+ (stat(options.xauth_location, &st) == -1)) {
+ packet_send_debug("No xauth program; cannot forward with spoofing.");
+ return 0;
+ }
+ if (s->display != NULL) {
+ debug("X11 display already set.");
+ return 0;
+ }
+ xauthfile = xmalloc(MAXPATHLEN);
+ strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
+ temporarily_use_uid(s->pw);
+ if (mkdtemp(xauthfile) == NULL) {
+ restore_uid();
+ error("private X11 dir: mkdtemp %s failed: %s",
+ xauthfile, strerror(errno));
+ xfree(xauthfile);
+ xauthfile = NULL;
+ return 0;
+ }
+ strlcat(xauthfile, "/cookies", MAXPATHLEN);
+ fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600);
+ if (fd >= 0)
+ close(fd);
+ restore_uid();
+ s->display = x11_create_display_inet(s->screen, options.x11_display_offset);
+ if (s->display == NULL) {
+ xauthfile_cleanup_proc(s->pw);
+ return 0;
+ }
+ fatal_add_cleanup(xauthfile_cleanup_proc, s->pw);
+ return 1;
+}
+
void
do_authenticated2(Authctxt *authctxt)
{
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