===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/ssh/kex.c,v
retrieving revision 1.175
retrieving revision 1.176
diff -u -r1.175 -r1.176
--- src/usr.bin/ssh/kex.c	2023/02/28 21:31:50	1.175
+++ src/usr.bin/ssh/kex.c	2023/03/06 12:14:48	1.176
@@ -1,4 +1,4 @@
-/* $OpenBSD: kex.c,v 1.175 2023/02/28 21:31:50 dtucker Exp $ */
+/* $OpenBSD: kex.c,v 1.176 2023/03/06 12:14:48 dtucker Exp $ */
 /*
  * Copyright (c) 2000, 2001 Markus Friedl.  All rights reserved.
  *
@@ -52,10 +52,12 @@
 #include "misc.h"
 #include "dispatch.h"
 #include "monitor.h"
+#include "myproposal.h"
 
 #include "ssherr.h"
 #include "sshbuf.h"
 #include "digest.h"
+#include "xmalloc.h"
 
 /* prototype */
 static int kex_choose_conf(struct ssh *);
@@ -300,6 +302,61 @@
 	free(list);
 	free(ret);
 	return r;
+}
+
+/*
+ * Fill out a proposal array with dynamically allocated values, which may
+ * be modified as required for compatibility reasons.
+ * Any of the options may be NULL, in which case the default is used.
+ * Array contents must be freed by calling kex_proposal_free_entries.
+ */
+void
+kex_proposal_populate_entries(struct ssh *ssh, char *prop[PROPOSAL_MAX],
+    const char *kexalgos, const char *ciphers, const char *macs,
+    const char *comp, const char *hkalgs)
+{
+	const char *defpropserver[PROPOSAL_MAX] = { KEX_SERVER };
+	const char *defpropclient[PROPOSAL_MAX] = { KEX_CLIENT };
+	const char **defprop = ssh->kex->server ? defpropserver : defpropclient;
+	u_int i;
+
+	if (prop == NULL)
+		fatal_f("proposal missing");
+
+	for (i = 0; i < PROPOSAL_MAX; i++) {
+		switch(i) {
+		case PROPOSAL_KEX_ALGS:
+			prop[i] = compat_kex_proposal(ssh,
+			    kexalgos ? kexalgos : defprop[i]);
+			break;
+		case PROPOSAL_ENC_ALGS_CTOS:
+		case PROPOSAL_ENC_ALGS_STOC:
+			prop[i] = xstrdup(ciphers ? ciphers : defprop[i]);
+			break;
+		case PROPOSAL_MAC_ALGS_CTOS:
+		case PROPOSAL_MAC_ALGS_STOC:
+			prop[i]  = xstrdup(macs ? macs : defprop[i]);
+			break;
+		case PROPOSAL_COMP_ALGS_CTOS:
+		case PROPOSAL_COMP_ALGS_STOC:
+			prop[i] = xstrdup(comp ? comp : defprop[i]);
+			break;
+		case PROPOSAL_SERVER_HOST_KEY_ALGS:
+			prop[i] = xstrdup(hkalgs ? hkalgs : defprop[i]);
+			break;
+		default:
+			prop[i] = xstrdup(defprop[i]);
+		}
+	}
+}
+
+void
+kex_proposal_free_entries(char *prop[PROPOSAL_MAX])
+{
+	u_int i;
+
+	for (i = 0; i < PROPOSAL_MAX; i++)
+		free(prop[i]);
 }
 
 /* put algorithm proposal into buffer */