version 1.80, 2001/06/04 21:59:43 |
version 1.81, 2001/06/04 23:16:16 |
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void session_set_fds(Session *s, int fdin, int fdout, int fderr); |
void session_set_fds(Session *s, int fdin, int fdout, int fderr); |
void session_pty_cleanup(Session *s); |
void session_pty_cleanup(Session *s); |
void session_proctitle(Session *s); |
void session_proctitle(Session *s); |
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int session_setup_x11fwd(Session *s); |
void do_exec_pty(Session *s, const char *command); |
void do_exec_pty(Session *s, const char *command); |
void do_exec_no_pty(Session *s, const char *command); |
void do_exec_no_pty(Session *s, const char *command); |
void do_login(Session *s, const char *command); |
void do_login(Session *s, const char *command); |
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{ |
{ |
Session *s; |
Session *s; |
char *command; |
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; |
int compression_level = 0, enable_compression_after_reply = 0; |
u_int proto_len, data_len, dlen; |
u_int proto_len, data_len, dlen; |
struct stat st; |
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s = session_new(); |
s = session_new(); |
s->pw = authctxt->pw; |
s->pw = authctxt->pw; |
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break; |
break; |
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case SSH_CMSG_X11_REQUEST_FORWARDING: |
case SSH_CMSG_X11_REQUEST_FORWARDING: |
if (!options.x11_forwarding) { |
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packet_send_debug("X11 forwarding disabled in server configuration file."); |
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break; |
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} |
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if (!options.xauth_location || |
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(stat(options.xauth_location, &st) == -1)) { |
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packet_send_debug("No xauth program; cannot forward with spoofing."); |
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break; |
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} |
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if (no_x11_forwarding_flag) { |
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packet_send_debug("X11 forwarding not permitted for this authentication."); |
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break; |
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} |
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debug("Received request for X11 forwarding with auth spoofing."); |
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if (s->display != NULL) |
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packet_disconnect("Protocol error: X11 display already set."); |
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s->auth_proto = packet_get_string(&proto_len); |
s->auth_proto = packet_get_string(&proto_len); |
s->auth_data = packet_get_string(&data_len); |
s->auth_data = packet_get_string(&data_len); |
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if (!screen_flag) |
if (!screen_flag) |
debug2("Buggy client: " |
debug2("Buggy client: " |
"X11 screen flag missing"); |
"X11 screen flag missing"); |
packet_integrity_check(plen, |
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4 + proto_len + 4 + data_len + 4, type); |
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s->screen = packet_get_int(); |
s->screen = packet_get_int(); |
} else { |
} else { |
packet_integrity_check(plen, |
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4 + proto_len + 4 + data_len, type); |
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s->screen = 0; |
s->screen = 0; |
} |
} |
s->display = x11_create_display_inet(s->screen, options.x11_display_offset); |
packet_done(); |
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success = session_setup_x11fwd(s); |
if (s->display == NULL) |
if (!success) { |
break; |
xfree(s->auth_proto); |
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xfree(s->auth_data); |
/* Setup to always have a local .Xauthority. */ |
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xauthfile = xmalloc(MAXPATHLEN); |
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strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); |
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temporarily_use_uid(s->pw); |
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if (mkdtemp(xauthfile) == NULL) { |
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restore_uid(); |
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error("private X11 dir: mkdtemp %s failed: %s", |
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xauthfile, strerror(errno)); |
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xfree(xauthfile); |
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xauthfile = NULL; |
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/* XXXX remove listening channels */ |
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break; |
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} |
} |
strlcat(xauthfile, "/cookies", MAXPATHLEN); |
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fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); |
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if (fd >= 0) |
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close(fd); |
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restore_uid(); |
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fatal_add_cleanup(xauthfile_cleanup_proc, s->pw); |
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success = 1; |
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break; |
break; |
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case SSH_CMSG_AGENT_REQUEST_FORWARDING: |
case SSH_CMSG_AGENT_REQUEST_FORWARDING: |
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int |
int |
session_x11_req(Session *s) |
session_x11_req(Session *s) |
{ |
{ |
int fd; |
int success; |
struct stat st; |
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if (no_x11_forwarding_flag) { |
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debug("X11 forwarding disabled in user configuration file."); |
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return 0; |
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} |
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if (!options.x11_forwarding) { |
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debug("X11 forwarding disabled in server configuration file."); |
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return 0; |
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} |
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if (!options.xauth_location || |
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(stat(options.xauth_location, &st) == -1)) { |
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packet_send_debug("No xauth program; cannot forward with spoofing."); |
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return 0; |
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} |
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if (xauthfile != NULL) { |
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debug("X11 fwd already started."); |
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return 0; |
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} |
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debug("Received request for X11 forwarding with auth spoofing."); |
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if (s->display != NULL) |
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packet_disconnect("Protocol error: X11 display already set."); |
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s->single_connection = packet_get_char(); |
s->single_connection = packet_get_char(); |
s->auth_proto = packet_get_string(NULL); |
s->auth_proto = packet_get_string(NULL); |
s->auth_data = packet_get_string(NULL); |
s->auth_data = packet_get_string(NULL); |
s->screen = packet_get_int(); |
s->screen = packet_get_int(); |
packet_done(); |
packet_done(); |
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s->display = x11_create_display_inet(s->screen, options.x11_display_offset); |
success = session_setup_x11fwd(s); |
if (s->display == NULL) { |
if (!success) { |
xfree(s->auth_proto); |
xfree(s->auth_proto); |
xfree(s->auth_data); |
xfree(s->auth_data); |
return 0; |
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} |
} |
xauthfile = xmalloc(MAXPATHLEN); |
return success; |
strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); |
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temporarily_use_uid(s->pw); |
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if (mkdtemp(xauthfile) == NULL) { |
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restore_uid(); |
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error("private X11 dir: mkdtemp %s failed: %s", |
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xauthfile, strerror(errno)); |
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xfree(xauthfile); |
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xauthfile = NULL; |
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xfree(s->auth_proto); |
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xfree(s->auth_data); |
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/* XXXX remove listening channels */ |
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return 0; |
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} |
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strlcat(xauthfile, "/cookies", MAXPATHLEN); |
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fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); |
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if (fd >= 0) |
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close(fd); |
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restore_uid(); |
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fatal_add_cleanup(xauthfile_cleanup_proc, s->pw); |
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return 1; |
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} |
} |
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int |
int |
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void |
void |
session_close(Session *s) |
session_close(Session *s) |
{ |
{ |
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if (s->display) { |
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xauthfile_cleanup_proc(s->pw); |
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fatal_remove_cleanup(xauthfile_cleanup_proc, s->pw); |
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} |
session_pty_cleanup(s); |
session_pty_cleanup(s); |
session_free(s); |
session_free(s); |
session_proctitle(s); |
session_proctitle(s); |
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error("no user for session %d", s->self); |
error("no user for session %d", s->self); |
else |
else |
setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); |
setproctitle("%s@%s", s->pw->pw_name, session_tty_list()); |
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} |
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int |
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session_setup_x11fwd(Session *s) |
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{ |
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int fd; |
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struct stat st; |
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if (no_x11_forwarding_flag) { |
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packet_send_debug("X11 forwarding disabled in user configuration file."); |
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return 0; |
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} |
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if (!options.x11_forwarding) { |
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debug("X11 forwarding disabled in server configuration file."); |
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return 0; |
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} |
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if (!options.xauth_location || |
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(stat(options.xauth_location, &st) == -1)) { |
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packet_send_debug("No xauth program; cannot forward with spoofing."); |
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return 0; |
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} |
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if (s->display != NULL) { |
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debug("X11 display already set."); |
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return 0; |
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} |
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xauthfile = xmalloc(MAXPATHLEN); |
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strlcpy(xauthfile, "/tmp/ssh-XXXXXXXX", MAXPATHLEN); |
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temporarily_use_uid(s->pw); |
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if (mkdtemp(xauthfile) == NULL) { |
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restore_uid(); |
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error("private X11 dir: mkdtemp %s failed: %s", |
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xauthfile, strerror(errno)); |
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xfree(xauthfile); |
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xauthfile = NULL; |
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return 0; |
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} |
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strlcat(xauthfile, "/cookies", MAXPATHLEN); |
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fd = open(xauthfile, O_RDWR|O_CREAT|O_EXCL, 0600); |
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if (fd >= 0) |
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close(fd); |
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restore_uid(); |
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s->display = x11_create_display_inet(s->screen, options.x11_display_offset); |
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if (s->display == NULL) { |
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xauthfile_cleanup_proc(s->pw); |
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return 0; |
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} |
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fatal_add_cleanup(xauthfile_cleanup_proc, s->pw); |
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return 1; |
} |
} |
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void |
void |