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authorBen Lindstrom <mouring@eviladmin.org>2002-06-11 15:59:02 +0000
committerBen Lindstrom <mouring@eviladmin.org>2002-06-11 15:59:02 +0000
commit8bb6f36c8fab33f7ca59b9c56e11d54caf36f965 (patch)
tree43640e011ff7a6a2a12f9aab2d728422f4d4b5b9 /session.c
parent914d03758be46488705950cf6d476855a702a13e (diff)
- markus@cvs.openbsd.org 2002/06/10 22:28:41
[channels.c channels.h session.c] move creation of agent socket to session.c; no need for uidswapping in channel.c.
Diffstat (limited to 'session.c')
-rw-r--r--session.c95
1 files changed, 91 insertions, 4 deletions
diff --git a/session.c b/session.c
index dcecf1ae..d2a460f8 100644
--- a/session.c
+++ b/session.c
@@ -33,7 +33,7 @@
*/
#include "includes.h"
-RCSID("$OpenBSD: session.c,v 1.135 2002/05/16 22:09:59 stevesk Exp $");
+RCSID("$OpenBSD: session.c,v 1.136 2002/06/10 22:28:41 markus Exp $");
#include "ssh.h"
#include "ssh1.h"
@@ -111,6 +111,93 @@ char *aixloginmsg;
login_cap_t *lc;
#endif
+/* 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(void *_pw)
+{
+ struct passwd *pw = _pw;
+
+ 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;
+ struct sockaddr_un sunaddr;
+
+ if (auth_sock_name != NULL) {
+ error("authentication forwarding requested twice.");
+ return 0;
+ }
+
+ /* Temporarily drop privileged uid for mkdir/bind. */
+ temporarily_use_uid(pw);
+
+ /* Allocate a buffer for the socket name, and format the name. */
+ auth_sock_name = xmalloc(MAXPATHLEN);
+ auth_sock_dir = xmalloc(MAXPATHLEN);
+ strlcpy(auth_sock_dir, "/tmp/ssh-XXXXXXXX", MAXPATHLEN);
+
+ /* 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_name);
+ xfree(auth_sock_dir);
+ auth_sock_name = NULL;
+ auth_sock_dir = NULL;
+ return 0;
+ }
+ snprintf(auth_sock_name, MAXPATHLEN, "%s/agent.%d",
+ auth_sock_dir, (int) getpid());
+
+ /* delete agent socket on fatal() */
+ fatal_add_cleanup(auth_sock_cleanup_proc, pw);
+
+ /* Create the socket. */
+ sock = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (sock < 0)
+ packet_disconnect("socket: %.100s", strerror(errno));
+
+ /* 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)
+ packet_disconnect("bind: %.100s", strerror(errno));
+
+ /* Restore the privileged uid. */
+ restore_uid();
+
+ /* Start listening on the socket. */
+ if (listen(sock, 5) < 0)
+ packet_disconnect("listen: %.100s", strerror(errno));
+
+ /* 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, xstrdup("auth socket"), 1);
+ strlcpy(nc->path, auth_sock_name, sizeof(nc->path));
+ return 1;
+}
+
+
void
do_authenticated(Authctxt *authctxt)
{
@@ -141,7 +228,7 @@ do_authenticated(Authctxt *authctxt)
do_authenticated1(authctxt);
/* remove agent socket */
- if (auth_get_socket_name())
+ if (auth_sock_name != NULL)
auth_sock_cleanup_proc(authctxt->pw);
#ifdef KRB4
if (options.kerberos_ticket_cleanup)
@@ -948,9 +1035,9 @@ do_setup_env(Session *s, const char *shell)
copy_environment(fetch_pam_environment(), &env, &envsize);
#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) {