Gemeinsame Unterverzeichnisse: openssh-8.4p1/contrib und openssh-8.4p1-vendor/contrib.
diff -u openssh-8.4p1/dh.c openssh-8.4p1-vendor/dh.c
--- openssh-8.4p1/dh.c	2020-09-27 09:25:01.000000000 +0200
+++ openssh-8.4p1-vendor/dh.c	2021-01-29 11:49:40.968418136 +0100
@@ -151,10 +151,18 @@
 	size_t linesize = 0;
 	int best, bestcount, which, linenum;
 	struct dhgroup dhg;
+	char *dh_moduli_path;
+	struct stat st;
 
-	if ((f = fopen(_PATH_DH_MODULI, "r")) == NULL) {
+	if (stat(_PATH_VENDOR_DH_MODULI, &st) == 0 &&
+	    stat(_PATH_DH_MODULI, &st) == -1) {
+	        dh_moduli_path = _PATH_VENDOR_DH_MODULI;
+	} else {
+	        dh_moduli_path = _PATH_DH_MODULI;
+	}
+	if ((f = fopen(dh_moduli_path, "r")) == NULL) {
 		logit("WARNING: could not open %s (%s), using fixed modulus",
-		    _PATH_DH_MODULI, strerror(errno));
+		      dh_moduli_path, strerror(errno));
 		return (dh_new_group_fallback(max));
 	}
 
@@ -185,7 +193,7 @@
 
 	if (bestcount == 0) {
 		fclose(f);
-		logit("WARNING: no suitable primes in %s", _PATH_DH_MODULI);
+		logit("WARNING: no suitable primes in %s", dh_moduli_path);
 		return (dh_new_group_fallback(max));
 	}
 	which = arc4random_uniform(bestcount);
@@ -210,7 +218,7 @@
 	fclose(f);
 	if (bestcount != which + 1) {
 		logit("WARNING: selected prime disappeared in %s, giving up",
-		    _PATH_DH_MODULI);
+		      dh_moduli_path);
 		return (dh_new_group_fallback(max));
 	}
 
Gemeinsame Unterverzeichnisse: openssh-8.4p1/.github und openssh-8.4p1-vendor/.github.
Gemeinsame Unterverzeichnisse: openssh-8.4p1/m4 und openssh-8.4p1-vendor/m4.
Gemeinsame Unterverzeichnisse: openssh-8.4p1/openbsd-compat und openssh-8.4p1-vendor/openbsd-compat.
diff -u openssh-8.4p1/pathnames.h openssh-8.4p1-vendor/pathnames.h
--- openssh-8.4p1/pathnames.h	2020-09-27 09:25:01.000000000 +0200
+++ openssh-8.4p1-vendor/pathnames.h	2021-01-29 11:35:41.655599046 +0100
@@ -18,6 +18,8 @@
 #define SSHDIR				ETCDIR "/ssh"
 #endif
 
+#define VENDORDIR			"/usr/etc/ssh"
+
 #ifndef _PATH_SSH_PIDDIR
 #define _PATH_SSH_PIDDIR		"/var/run"
 #endif
@@ -35,13 +37,17 @@
  * should be world-readable.
  */
 #define _PATH_SERVER_CONFIG_FILE	SSHDIR "/sshd_config"
+#define _PATH_SERVER_VENDOR_CONFIG_FILE	VENDORDIR "/sshd_config"
 #define _PATH_HOST_CONFIG_FILE		SSHDIR "/ssh_config"
+#define _PATH_HOST_VENDOR_CONFIG_FILE   VENDORDIR "/ssh_config"
 #define _PATH_HOST_DSA_KEY_FILE		SSHDIR "/ssh_host_dsa_key"
 #define _PATH_HOST_ECDSA_KEY_FILE	SSHDIR "/ssh_host_ecdsa_key"
 #define _PATH_HOST_ED25519_KEY_FILE	SSHDIR "/ssh_host_ed25519_key"
 #define _PATH_HOST_XMSS_KEY_FILE	SSHDIR "/ssh_host_xmss_key"
 #define _PATH_HOST_RSA_KEY_FILE		SSHDIR "/ssh_host_rsa_key"
 #define _PATH_DH_MODULI			SSHDIR "/moduli"
+#define	_PATH_VENDOR_DH_MODULI		VENDORDIR "/moduli"
+
 
 #ifndef _PATH_SSH_PROGRAM
 #define _PATH_SSH_PROGRAM		"/usr/bin/ssh"
Gemeinsame Unterverzeichnisse: openssh-8.4p1/regress und openssh-8.4p1-vendor/regress.
diff -u openssh-8.4p1/ssh.c openssh-8.4p1-vendor/ssh.c
--- openssh-8.4p1/ssh.c	2020-09-27 09:25:01.000000000 +0200
+++ openssh-8.4p1-vendor/ssh.c	2021-01-27 18:22:52.322271681 +0100
@@ -593,6 +593,7 @@
 process_config_files(const char *host_name, struct passwd *pw, int final_pass,
     int *want_final_pass)
 {
+	struct stat st;
 	char buf[PATH_MAX];
 	int r;
 
@@ -611,10 +612,23 @@
 			    &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
 			    (final_pass ? SSHCONF_FINAL : 0), want_final_pass);
 
-		/* Read systemwide configuration file after user config. */
-		(void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
-		    host, host_name, &options,
-		    final_pass ? SSHCONF_FINAL : 0, want_final_pass);
+		/* If only the vendor configuration file exists, use that.
+		 * Else use the standard configuration file.
+		 */
+		if (stat(_PATH_HOST_VENDOR_CONFIG_FILE, &st) == 0 &&
+		    stat(_PATH_HOST_CONFIG_FILE, &st) == -1) {
+		        /* Read vendor distributed configuration file. */
+		        (void)read_config_file(_PATH_HOST_VENDOR_CONFIG_FILE,
+					       pw, host, host_name, &options,
+					       final_pass ? SSHCONF_FINAL : 0,
+					       want_final_pass);
+		} else {
+		        /* Read systemwide configuration file after user config. */
+		        (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
+					       host, host_name, &options,
+					       final_pass ? SSHCONF_FINAL : 0,
+					       want_final_pass);
+		}
 	}
 }
 
Nur in openssh-8.4p1-vendor: #ssh_config.5#.
diff -u openssh-8.4p1/ssh_config.5 openssh-8.4p1-vendor/ssh_config.5
--- openssh-8.4p1/ssh_config.5	2020-09-27 09:25:01.000000000 +0200
+++ openssh-8.4p1-vendor/ssh_config.5	2021-02-24 12:02:53.935729753 +0100
@@ -54,6 +54,9 @@
 .It
 system-wide configuration file
 .Pq Pa /etc/ssh/ssh_config
+.It
+vendor configuration file
+.Pq Pa /usr/etc/ssh/ssh_config
 .El
 .Pp
 For each parameter, the first obtained value
@@ -1942,6 +1945,11 @@
 values that are not specified in the user's configuration file, and
 for those users who do not have a configuration file.
 This file must be world-readable.
+.It Pa /usr/etc/ssh/ssh_config
+Vendor specific configuraiton file.
+This file provides the vendor defaults and is used as fallback if the
+.Ic /etc/ssh/ssh_config
+configuration file does not exist.
 .El
 .Sh SEE ALSO
 .Xr ssh 1
Nur in openssh-8.4p1-vendor: ssh_config.5~.
diff -u openssh-8.4p1/sshd.c openssh-8.4p1-vendor/sshd.c
--- openssh-8.4p1/sshd.c	2020-09-27 09:25:01.000000000 +0200
+++ openssh-8.4p1-vendor/sshd.c	2021-01-27 18:25:38.370273280 +0100
@@ -136,7 +136,7 @@
 ServerOptions options;
 
 /* Name of the server configuration file. */
-char *config_file_name = _PATH_SERVER_CONFIG_FILE;
+char *config_file_name = NULL;
 
 /*
  * Debug mode flag.  This can be set on the command line.  If debug
@@ -1526,6 +1526,7 @@
 int
 main(int ac, char **av)
 {
+	struct stat st;
 	struct ssh *ssh = NULL;
 	extern char *optarg;
 	extern int optind;
@@ -1737,7 +1738,21 @@
 			 */
 			(void)atomicio(vwrite, startup_pipe, "\0", 1);
 		}
+	} else if (config_file_name == NULL) {
+	        /* If only the vendor configuration file exists, use that.
+		 * Else use the standard configuration file.
+		 */
+		if (stat(_PATH_SERVER_VENDOR_CONFIG_FILE, &st) == 0 &&
+		    stat(_PATH_SERVER_CONFIG_FILE, &st) == -1) {
+		        /* fill with global distributor settings */
+                        config_file_name = _PATH_SERVER_VENDOR_CONFIG_FILE;
+		} else {
+		        /* load global admin settings */
+			config_file_name = _PATH_SERVER_CONFIG_FILE;
+		}
+		load_server_config(config_file_name, cfg);
 	} else if (strcasecmp(config_file_name, "none") != 0)
+	        /* load config specified on commandline */
 		load_server_config(config_file_name, cfg);
 
 	parse_server_config(&options, rexeced_flag ? "rexec" : config_file_name,
diff -u openssh-8.4p1/sshd_config.5 openssh-8.4p1-vendor/sshd_config.5
--- openssh-8.4p1/sshd_config.5	2020-09-27 09:25:01.000000000 +0200
+++ openssh-8.4p1-vendor/sshd_config.5	2021-02-24 14:14:27.912038335 +0100
@@ -44,7 +44,9 @@
 .Xr sshd 8
 reads configuration data from
 .Pa /etc/ssh/sshd_config
-(or the file specified with
+(
+.Pa /usr/etc/ssh/sshd_config
+if the file does not exist or the file specified with
 .Fl f
 on the command line).
 The file contains keyword-argument pairs, one per line.
Nur in openssh-8.4p1-vendor: sshd_config.5~.
diff -u openssh-8.4p1/ssh-keysign.c openssh-8.4p1-vendor/ssh-keysign.c
--- openssh-8.4p1/ssh-keysign.c	2020-09-27 09:25:01.000000000 +0200
+++ openssh-8.4p1-vendor/ssh-keysign.c	2021-02-24 11:34:17.684570215 +0100
@@ -172,6 +172,7 @@
 	u_char *signature, *data, rver;
 	char *host, *fp;
 	size_t slen, dlen;
+        struct stat st;
 
 	if (pledge("stdio rpath getpw dns id", NULL) != 0)
 		fatal("%s: pledge: %s", __progname, strerror(errno));
@@ -205,8 +206,12 @@
 
 	/* verify that ssh-keysign is enabled by the admin */
 	initialize_options(&options);
-	(void)read_config_file(_PATH_HOST_CONFIG_FILE, pw, "", "",
-	    &options, 0, NULL);
+	if (stat(_PATH_HOST_CONFIG_FILE, &st) == 0)
+	        (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw, "", "",
+		    &options, 0, NULL);
+	else
+	        (void)read_config_file(_PATH_HOST_VENDOR_CONFIG_FILE, pw,
+		    "", "", &options, 0, NULL);
 	fill_default_options(&options);
 	if (options.enable_ssh_keysign != 1)
 		fatal("ssh-keysign not enabled in %s",
Nur in openssh-8.4p1-vendor: ssh-keysign.c~.