OpenSolaris Launch

1 files changed, 248 insertions, 0 deletions

diff --git a/usr/src/cmd/ssh/libssh/common/kexgsss.c b/usr/src/cmd/ssh/libssh/common/kexgsss.c
new file mode 100644
index 0000000000..d777874feb
--- /dev/null
+++ b/usr/src/cmd/ssh/libssh/common/kexgsss.c
@@ -0,0 +1,248 @@
+/*
+ * Copyright (c) 2001-2003 Simon Wilkinson. 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.
+ */
+/*
+ * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include "includes.h"
+
+#ifdef GSSAPI
+
+#include <openssl/crypto.h>
+#include <openssl/bn.h>
+
+#include "xmalloc.h"
+#include "buffer.h"
+#include "bufaux.h"
+#include "compat.h"
+#include "kex.h"
+#include "log.h"
+#include "packet.h"
+#include "dh.h"
+#include "ssh2.h"
+#include "ssh-gss.h"
+#include "monitor_wrap.h"
+
+Gssctxt *xxx_gssctxt;
+
+static void kex_gss_send_error(Gssctxt *ctxt);
+
+void
+kexgss_server(Kex *kex)
+{
+	OM_uint32 maj_status, min_status;
+	gss_buffer_desc gssbuf, send_tok, recv_tok, msg_tok;
+	Gssctxt *ctxt = NULL;
+        unsigned int klen, kout;
+        unsigned int sbloblen = 0;
+        unsigned char *kbuf, *hash;
+	unsigned char *server_host_key_blob = NULL;
+        DH *dh;
+	Key *server_host_key = NULL;
+        BIGNUM *shared_secret = NULL;
+        BIGNUM *dh_client_pub = NULL;
+	int type =0;
+	u_int slen;
+	gss_OID oid;
+
+	/*
+	 * Load host key to advertise in a SSH_MSG_KEXGSS_HOSTKEY packet
+	 * -- unlike KEX_DH/KEX_GEX no host key, no problem since it's
+	 * the GSS-API that provides for server host authentication.
+	 */
+	if (kex->load_host_key != NULL &&
+	    !(datafellows & SSH_BUG_GSSKEX_HOSTKEY))
+		server_host_key = kex->load_host_key(kex->hostkey_type);
+	if (server_host_key != NULL)
+		key_to_blob(server_host_key, &server_host_key_blob, &sbloblen);
+
+
+	/* Initialise GSSAPI */
+
+	ssh_gssapi_oid_of_kexname(kex->name, &oid);
+	if (oid == GSS_C_NULL_OID) {
+		fatal("Couldn't match the negotiated GSS key exchange");
+	}
+
+	ssh_gssapi_build_ctx(&ctxt, 0, oid);
+
+	xxx_gssctxt = ctxt;
+
+	do {
+		debug("Wait SSH2_MSG_GSSAPI_INIT");
+		type = packet_read();
+		switch(type) {
+		case SSH2_MSG_KEXGSS_INIT:
+			if (dh_client_pub!=NULL)
+				fatal("Received KEXGSS_INIT after initialising");
+			recv_tok.value=packet_get_string(&slen);
+			recv_tok.length=slen; /* int vs. size_t */
+
+		        dh_client_pub = BN_new();
+
+		        if (dh_client_pub == NULL)
+        			fatal("dh_client_pub == NULL");
+		  	packet_get_bignum2(dh_client_pub);
+
+		  	/* Send SSH_MSG_KEXGSS_HOSTKEY here, if we want */
+			if (sbloblen) {
+				packet_start(SSH2_MSG_KEXGSS_HOSTKEY);
+				packet_put_string(server_host_key_blob, sbloblen);
+				packet_send();
+				packet_write_wait();
+			}
+			break;
+		case SSH2_MSG_KEXGSS_CONTINUE:
+			recv_tok.value=packet_get_string(&slen);
+			recv_tok.length=slen; /* int vs. size_t */
+			break;
+		default:
+			packet_disconnect("Protocol error: didn't expect packet type %d",
+					   type);
+		}
+
+		maj_status=PRIVSEP(ssh_gssapi_accept_ctx(ctxt,&recv_tok,
+							 &send_tok));
+
+		xfree(recv_tok.value); /* We allocated this, not gss */
+
+		if (dh_client_pub == NULL)
+			fatal("No client public key");
+
+		if (maj_status == GSS_S_CONTINUE_NEEDED) {
+			debug("Sending GSSAPI_CONTINUE");
+			packet_start(SSH2_MSG_KEXGSS_CONTINUE);
+			packet_put_string(send_tok.value,send_tok.length);
+			packet_send();
+			packet_write_wait();
+			(void) gss_release_buffer(&min_status, &send_tok);
+		}
+	} while (maj_status == GSS_S_CONTINUE_NEEDED);
+
+	if (GSS_ERROR(maj_status)) {
+		kex_gss_send_error(ctxt);
+		if (send_tok.length>0) {
+			packet_start(SSH2_MSG_KEXGSS_CONTINUE);
+			packet_put_string(send_tok.value,send_tok.length);
+			packet_send();
+			packet_write_wait();
+			(void) gss_release_buffer(&min_status, &send_tok);
+		}
+		fatal("accept_ctx died");
+	}
+
+	debug("gss_complete");
+	if (!(ctxt->flags & GSS_C_MUTUAL_FLAG))
+		fatal("Mutual authentication flag wasn't set");
+
+	if (!(ctxt->flags & GSS_C_INTEG_FLAG))
+		fatal("Integrity flag wasn't set");
+
+	dh = dh_new_group1();
+	dh_gen_key(dh, kex->we_need * 8);
+
+        if (!dh_pub_is_valid(dh, dh_client_pub))
+                packet_disconnect("bad client public DH value");
+
+        klen = DH_size(dh);
+        kbuf = xmalloc(klen);
+        kout = DH_compute_key(kbuf, dh_client_pub, dh);
+
+	shared_secret = BN_new();
+	BN_bin2bn(kbuf, kout, shared_secret);
+	(void) memset(kbuf, 0, klen);
+	xfree(kbuf);
+
+	/* The GSSAPI hash is identical to the Diffie Helman one */
+        hash = kex_dh_hash(
+            kex->client_version_string,
+            kex->server_version_string,
+            buffer_ptr(&kex->peer), buffer_len(&kex->peer),
+            buffer_ptr(&kex->my), buffer_len(&kex->my),
+            server_host_key_blob, sbloblen,
+            dh_client_pub,
+            dh->pub_key,
+            shared_secret
+	);
+	BN_free(dh_client_pub);
+
+	if (kex->session_id == NULL) {
+		kex->session_id_len = 20;
+		kex->session_id = xmalloc(kex->session_id_len);
+		(void) memcpy(kex->session_id, hash, kex->session_id_len);
+	}
+
+	/* Should fix kex_dh_hash to output hash length */
+	gssbuf.length = 20;	/* yes, it's always 20 (SHA-1) */
+	gssbuf.value = hash;	/* and it's static constant storage */
+
+	if (GSS_ERROR(ssh_gssapi_get_mic(ctxt,&gssbuf,&msg_tok))) {
+		kex_gss_send_error(ctxt);
+		fatal("Couldn't get MIC");
+	}
+
+	packet_start(SSH2_MSG_KEXGSS_COMPLETE);
+	packet_put_bignum2(dh->pub_key);
+	packet_put_string((char *)msg_tok.value,msg_tok.length);
+	(void) gss_release_buffer(&min_status, &msg_tok);
+
+	if (send_tok.length != 0) {
+		packet_put_char(1); /* true */
+		packet_put_string((char *)send_tok.value,send_tok.length);
+		(void) gss_release_buffer(&min_status, &send_tok);
+	} else {
+		packet_put_char(0); /* false */
+	}
+ 	packet_send();
+	packet_write_wait();
+
+	DH_free(dh);
+
+	kex_derive_keys(kex, hash, shared_secret);
+	BN_clear_free(shared_secret);
+	kex_finish(kex);
+}
+
+static void
+kex_gss_send_error(Gssctxt *ctxt) {
+	char *errstr;
+	OM_uint32 maj,min;
+
+	errstr = ssh_gssapi_last_error(ctxt,&maj,&min);
+	if (errstr) {
+		packet_start(SSH2_MSG_KEXGSS_ERROR);
+		packet_put_int(maj);
+		packet_put_int(min);
+		packet_put_cstring(errstr);
+		packet_put_cstring("");
+		packet_send();
+		packet_write_wait();
+		/* XXX - We should probably log the error locally here */
+		xfree(errstr);
+	}
+}
+#endif /* GSSAPI */