Adding upstream version 1:9.18.19.upstream/1%9.18.19upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

13 files changed, 2151 insertions, 0 deletions

diff --git a/bin/confgen/Makefile.am b/bin/confgen/Makefile.am
new file mode 100644
index 0000000..c1dca43
--- /dev/null
+++ b/bin/confgen/Makefile.am
@@ -0,0 +1,30 @@
+include $(top_srcdir)/Makefile.top
+
+AM_CPPFLAGS +=			\
+	$(LIBISC_CFLAGS)	\
+	$(LIBDNS_CFLAGS)	\
+	-DRNDC_KEYFILE=\"${sysconfdir}/rndc.key\"
+
+LDADD +=			\
+	libconfgen.la		\
+	$(LIBISC_LIBS)		\
+	$(LIBDNS_LIBS)
+
+noinst_LTLIBRARIES = libconfgen.la
+
+libconfgen_la_SOURCES =		\
+	include/confgen/os.h	\
+	keygen.c		\
+	keygen.h		\
+	os.c			\
+	util.c			\
+	util.h
+
+sbin_PROGRAMS = tsig-keygen rndc-confgen
+
+install-exec-hook:
+	ln -f $(DESTDIR)$(sbindir)/tsig-keygen \
+	      $(DESTDIR)$(sbindir)/ddns-confgen
+
+uninstall-hook:
+	-rm -f $(DESTDIR)$(sbindir)/ddns-confgen
diff --git a/bin/confgen/Makefile.in b/bin/confgen/Makefile.in
new file mode 100644
index 0000000..5589f9e
--- /dev/null
+++ b/bin/confgen/Makefile.in
@@ -0,0 +1,876 @@
+# Makefile.in generated by automake 1.16.5 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2021 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+# Hey Emacs, this is -*- makefile-automake -*- file!
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+
+
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+}
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+rndc_confgen_DEPENDENCIES = libconfgen.la $(LIBISC_LIBS) \
+	$(LIBDNS_LIBS)
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+noinst_LTLIBRARIES = libconfgen.la
+libconfgen_la_SOURCES = \
+	include/confgen/os.h	\
+	keygen.c		\
+	keygen.h		\
+	os.c			\
+	util.c			\
+	util.h
+
+all: all-am
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+	ln -f $(DESTDIR)$(sbindir)/tsig-keygen \
+	      $(DESTDIR)$(sbindir)/ddns-confgen
+
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+	-rm -f $(DESTDIR)$(sbindir)/ddns-confgen
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diff --git a/bin/confgen/ddns-confgen.rst b/bin/confgen/ddns-confgen.rst
new file mode 100644
index 0000000..9dd9d5e
--- /dev/null
+++ b/bin/confgen/ddns-confgen.rst
@@ -0,0 +1,96 @@
+.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+..
+.. SPDX-License-Identifier: MPL-2.0
+..
+.. This Source Code Form is subject to the terms of the Mozilla Public
+.. License, v. 2.0.  If a copy of the MPL was not distributed with this
+.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
+..
+.. See the COPYRIGHT file distributed with this work for additional
+.. information regarding copyright ownership.
+
+.. highlight: console
+
+.. BEWARE: Do not forget to edit also tsig-keygen.rst!
+
+.. iscman:: ddns-confgen
+.. program:: ddns-confgen
+.. _man_ddns-confgen:
+
+ddns-confgen - TSIG key generation tool
+---------------------------------------
+
+Synopsis
+~~~~~~~~
+:program:`ddns-confgen` [**-a** algorithm] [**-h**] [**-k** keyname] [**-q**] [**-s** name] [**-z** zone]
+
+Description
+~~~~~~~~~~~
+
+:program:`ddns-confgen` is an utility that generates keys for use in TSIG signing.
+The resulting keys can be used, for example, to secure dynamic DNS updates
+to a zone, or for the :iscman:`rndc` command channel.
+
+The key name can specified using :option:`-k` parameter and defaults to ``ddns-key``.
+The generated key is accompanied by configuration text and instructions that
+can be used with :iscman:`nsupdate` and :iscman:`named` when setting up dynamic DNS,
+including an example ``update-policy`` statement.
+(This usage is similar to the :iscman:`rndc-confgen` command for setting up
+command-channel security.)
+
+Note that :iscman:`named` itself can configure a local DDNS key for use with
+:option:`nsupdate -l`; it does this when a zone is configured with
+``update-policy local;``. :program:`ddns-confgen` is only needed when a more
+elaborate configuration is required: for instance, if :iscman:`nsupdate` is to
+be used from a remote system.
+
+Options
+~~~~~~~
+
+.. option:: -a algorithm
+
+   This option specifies the algorithm to use for the TSIG key. Available
+   choices are: hmac-md5, hmac-sha1, hmac-sha224, hmac-sha256, hmac-sha384,
+   and hmac-sha512. The default is hmac-sha256. Options are
+   case-insensitive, and the "hmac-" prefix may be omitted.
+
+.. option:: -h
+
+   This option prints a short summary of options and arguments.
+
+.. option:: -k keyname
+
+   This option specifies the key name of the DDNS authentication key. The
+   default is ``ddns-key`` when neither the :option:`-s` nor :option:`-z` option is
+   specified; otherwise, the default is ``ddns-key`` as a separate label
+   followed by the argument of the option, e.g., ``ddns-key.example.com.``
+   The key name must have the format of a valid domain name, consisting of
+   letters, digits, hyphens, and periods.
+
+.. option:: -q
+
+   This option enables quiet mode, which prints only the key, with no
+   explanatory text or usage examples. This is essentially identical to
+   :iscman:`tsig-keygen`.
+
+.. option:: -s name
+
+   This option generates a configuration example to allow dynamic updates
+   of a single hostname. The example :iscman:`named.conf` text shows how to set
+   an update policy for the specified name using the "name" nametype. The
+   default key name is ``ddns-key.name``. Note that the "self" nametype
+   cannot be used, since the name to be updated may differ from the key
+   name. This option cannot be used with the :option:`-z` option.
+
+.. option:: -z zone
+
+   This option generates a configuration example to allow
+   dynamic updates of a zone. The example :iscman:`named.conf` text shows how
+   to set an update policy for the specified zone using the "zonesub"
+   nametype, allowing updates to all subdomain names within that zone.
+   This option cannot be used with the :option:`-s` option.
+
+See Also
+~~~~~~~~
+
+:iscman:`nsupdate(1) <nsupdate>`, :iscman:`named.conf(5) <named.conf>`, :iscman:`named(8) <named>`, BIND 9 Administrator Reference Manual.
diff --git a/bin/confgen/include/confgen/os.h b/bin/confgen/include/confgen/os.h
new file mode 100644
index 0000000..2a924a3
--- /dev/null
+++ b/bin/confgen/include/confgen/os.h
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#pragma once
+
+#include <stdio.h>
+
+#include <isc/lang.h>
+
+ISC_LANG_BEGINDECLS
+
+int
+set_user(FILE *fd, const char *user);
+/*%<
+ * Set the owner of the file referenced by 'fd' to 'user'.
+ * Returns:
+ *   0 		success
+ *   -1 	insufficient permissions, or 'user' does not exist.
+ */
+
+ISC_LANG_ENDDECLS
diff --git a/bin/confgen/keygen.c b/bin/confgen/keygen.c
new file mode 100644
index 0000000..97dfa34
--- /dev/null
+++ b/bin/confgen/keygen.c
@@ -0,0 +1,178 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include "keygen.h"
+#include <stdarg.h>
+#include <stdlib.h>
+
+#include <isc/base64.h>
+#include <isc/buffer.h>
+#include <isc/file.h>
+#include <isc/mem.h>
+#include <isc/print.h>
+#include <isc/result.h>
+#include <isc/string.h>
+
+#include <dns/keyvalues.h>
+#include <dns/name.h>
+
+#include <dst/dst.h>
+
+#include <confgen/os.h>
+
+#include "util.h"
+
+/*%
+ * Convert string to algorithm type.
+ */
+dns_secalg_t
+alg_fromtext(const char *name) {
+	const char *p = name;
+	if (strncasecmp(p, "hmac-", 5) == 0) {
+		p = &name[5];
+	}
+
+	if (strcasecmp(p, "md5") == 0) {
+		return (DST_ALG_HMACMD5);
+	}
+	if (strcasecmp(p, "sha1") == 0) {
+		return (DST_ALG_HMACSHA1);
+	}
+	if (strcasecmp(p, "sha224") == 0) {
+		return (DST_ALG_HMACSHA224);
+	}
+	if (strcasecmp(p, "sha256") == 0) {
+		return (DST_ALG_HMACSHA256);
+	}
+	if (strcasecmp(p, "sha384") == 0) {
+		return (DST_ALG_HMACSHA384);
+	}
+	if (strcasecmp(p, "sha512") == 0) {
+		return (DST_ALG_HMACSHA512);
+	}
+	return (DST_ALG_UNKNOWN);
+}
+
+/*%
+ * Return default keysize for a given algorithm type.
+ */
+int
+alg_bits(dns_secalg_t alg) {
+	switch (alg) {
+	case DST_ALG_HMACMD5:
+		return (128);
+	case DST_ALG_HMACSHA1:
+		return (160);
+	case DST_ALG_HMACSHA224:
+		return (224);
+	case DST_ALG_HMACSHA256:
+		return (256);
+	case DST_ALG_HMACSHA384:
+		return (384);
+	case DST_ALG_HMACSHA512:
+		return (512);
+	default:
+		return (0);
+	}
+}
+
+/*%
+ * Generate a key of size 'keysize' and place it in 'key_txtbuffer'
+ */
+void
+generate_key(isc_mem_t *mctx, dns_secalg_t alg, int keysize,
+	     isc_buffer_t *key_txtbuffer) {
+	isc_result_t result = ISC_R_SUCCESS;
+	isc_buffer_t key_rawbuffer;
+	isc_region_t key_rawregion;
+	char key_rawsecret[64];
+	dst_key_t *key = NULL;
+
+	switch (alg) {
+	case DST_ALG_HMACMD5:
+	case DST_ALG_HMACSHA1:
+	case DST_ALG_HMACSHA224:
+	case DST_ALG_HMACSHA256:
+		if (keysize < 1 || keysize > 512) {
+			fatal("keysize %d out of range (must be 1-512)\n",
+			      keysize);
+		}
+		break;
+	case DST_ALG_HMACSHA384:
+	case DST_ALG_HMACSHA512:
+		if (keysize < 1 || keysize > 1024) {
+			fatal("keysize %d out of range (must be 1-1024)\n",
+			      keysize);
+		}
+		break;
+	default:
+		fatal("unsupported algorithm %d\n", alg);
+	}
+
+	DO("initialize dst library", dst_lib_init(mctx, NULL));
+
+	DO("generate key",
+	   dst_key_generate(dns_rootname, alg, keysize, 0, 0, DNS_KEYPROTO_ANY,
+			    dns_rdataclass_in, mctx, &key, NULL));
+
+	isc_buffer_init(&key_rawbuffer, &key_rawsecret, sizeof(key_rawsecret));
+
+	DO("dump key to buffer", dst_key_tobuffer(key, &key_rawbuffer));
+
+	isc_buffer_usedregion(&key_rawbuffer, &key_rawregion);
+
+	DO("bsse64 encode secret",
+	   isc_base64_totext(&key_rawregion, -1, "", key_txtbuffer));
+
+	if (key != NULL) {
+		dst_key_free(&key);
+	}
+
+	dst_lib_destroy();
+}
+
+/*%
+ * Write a key file to 'keyfile'.  If 'user' is non-NULL,
+ * make that user the owner of the file.  The key will have
+ * the name 'keyname' and the secret in the buffer 'secret'.
+ */
+void
+write_key_file(const char *keyfile, const char *user, const char *keyname,
+	       isc_buffer_t *secret, dns_secalg_t alg) {
+	isc_result_t result;
+	const char *algname = dst_hmac_algorithm_totext(alg);
+	FILE *fd = NULL;
+
+	DO("create keyfile", isc_file_safecreate(keyfile, &fd));
+
+	if (user != NULL) {
+		if (set_user(fd, user) == -1) {
+			fatal("unable to set file owner\n");
+		}
+	}
+
+	fprintf(fd,
+		"key \"%s\" {\n\talgorithm %s;\n"
+		"\tsecret \"%.*s\";\n};\n",
+		keyname, algname, (int)isc_buffer_usedlength(secret),
+		(char *)isc_buffer_base(secret));
+	fflush(fd);
+	if (ferror(fd)) {
+		fatal("write to %s failed\n", keyfile);
+	}
+	if (fclose(fd)) {
+		fatal("fclose(%s) failed\n", keyfile);
+	}
+}
diff --git a/bin/confgen/keygen.h b/bin/confgen/keygen.h
new file mode 100644
index 0000000..f5b7a55
--- /dev/null
+++ b/bin/confgen/keygen.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#pragma once
+
+/*! \file */
+
+#include <isc/buffer.h>
+#include <isc/lang.h>
+#include <isc/mem.h>
+
+#include <dns/secalg.h>
+
+ISC_LANG_BEGINDECLS
+
+void
+generate_key(isc_mem_t *mctx, dns_secalg_t alg, int keysize,
+	     isc_buffer_t *key_txtbuffer);
+
+void
+write_key_file(const char *keyfile, const char *user, const char *keyname,
+	       isc_buffer_t *secret, dns_secalg_t alg);
+
+const char *
+alg_totext(dns_secalg_t alg);
+dns_secalg_t
+alg_fromtext(const char *name);
+int
+alg_bits(dns_secalg_t alg);
+
+ISC_LANG_ENDDECLS
diff --git a/bin/confgen/os.c b/bin/confgen/os.c
new file mode 100644
index 0000000..445d64b
--- /dev/null
+++ b/bin/confgen/os.c
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <confgen/os.h>
+
+int
+set_user(FILE *fd, const char *user) {
+	struct passwd *pw;
+
+	pw = getpwnam(user);
+	if (pw == NULL) {
+		errno = EINVAL;
+		return (-1);
+	}
+	return (fchown(fileno(fd), pw->pw_uid, -1));
+}
diff --git a/bin/confgen/rndc-confgen.c b/bin/confgen/rndc-confgen.c
new file mode 100644
index 0000000..8179295
--- /dev/null
+++ b/bin/confgen/rndc-confgen.c
@@ -0,0 +1,294 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+/**
+ * rndc-confgen generates configuration files for rndc. It can be used
+ * as a convenient alternative to writing the rndc.conf file and the
+ * corresponding controls and key statements in named.conf by hand.
+ * Alternatively, it can be run with the -a option to set up a
+ * rndc.key file and avoid the need for a rndc.conf file and a
+ * controls statement altogether.
+ */
+
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+#include <isc/assertions.h>
+#include <isc/attributes.h>
+#include <isc/base64.h>
+#include <isc/buffer.h>
+#include <isc/commandline.h>
+#include <isc/file.h>
+#include <isc/mem.h>
+#include <isc/net.h>
+#include <isc/print.h>
+#include <isc/result.h>
+#include <isc/string.h>
+#include <isc/time.h>
+#include <isc/util.h>
+
+#include <dns/keyvalues.h>
+#include <dns/name.h>
+
+#include <dst/dst.h>
+
+#include <confgen/os.h>
+
+#include "keygen.h"
+#include "util.h"
+
+#define DEFAULT_KEYNAME "rndc-key"
+#define DEFAULT_SERVER	"127.0.0.1"
+#define DEFAULT_PORT	953
+
+static char program[256];
+const char *progname;
+
+bool verbose = false;
+
+const char *keyfile, *keydef;
+
+noreturn static void
+usage(int status);
+
+static void
+usage(int status) {
+	fprintf(stderr, "\
+Usage:\n\
+ %s [-a] [-b bits] [-c keyfile] [-k keyname] [-p port] \
+[-s addr] [-t chrootdir] [-u user]\n\
+  -a:		 generate just the key clause and write it to keyfile (%s)\n\
+  -A alg:	 algorithm (default hmac-sha256)\n\
+  -b bits:	 from 1 through 512, default 256; total length of the secret\n\
+  -c keyfile:	 specify an alternate key file (requires -a)\n\
+  -k keyname:	 the name as it will be used  in named.conf and rndc.conf\n\
+  -p port:	 the port named will listen on and rndc will connect to\n\
+  -q:		 suppress printing written key path\n\
+  -s addr:	 the address to which rndc should connect\n\
+  -t chrootdir:	 write a keyfile in chrootdir as well (requires -a)\n\
+  -u user:	 set the keyfile owner to \"user\" (requires -a)\n",
+		progname, keydef);
+
+	exit(status);
+}
+
+int
+main(int argc, char **argv) {
+	bool show_final_mem = false;
+	isc_buffer_t key_txtbuffer;
+	char key_txtsecret[256];
+	isc_mem_t *mctx = NULL;
+	isc_result_t result = ISC_R_SUCCESS;
+	const char *keyname = NULL;
+	const char *serveraddr = NULL;
+	dns_secalg_t alg;
+	const char *algname;
+	char *p;
+	int ch;
+	int port;
+	int keysize = -1;
+	struct in_addr addr4_dummy;
+	struct in6_addr addr6_dummy;
+	char *chrootdir = NULL;
+	char *user = NULL;
+	bool keyonly = false;
+	bool quiet = false;
+	int len;
+
+	keydef = keyfile = RNDC_KEYFILE;
+
+	result = isc_file_progname(*argv, program, sizeof(program));
+	if (result != ISC_R_SUCCESS) {
+		memmove(program, "rndc-confgen", 13);
+	}
+	progname = program;
+
+	keyname = DEFAULT_KEYNAME;
+	alg = DST_ALG_HMACSHA256;
+	serveraddr = DEFAULT_SERVER;
+	port = DEFAULT_PORT;
+
+	isc_commandline_errprint = false;
+
+	while ((ch = isc_commandline_parse(argc, argv,
+					   "aA:b:c:hk:Mmp:r:s:t:u:Vy")) != -1)
+	{
+		switch (ch) {
+		case 'a':
+			keyonly = true;
+			break;
+		case 'A':
+			algname = isc_commandline_argument;
+			alg = alg_fromtext(algname);
+			if (alg == DST_ALG_UNKNOWN) {
+				fatal("Unsupported algorithm '%s'", algname);
+			}
+			break;
+		case 'b':
+			keysize = strtol(isc_commandline_argument, &p, 10);
+			if (*p != '\0' || keysize < 0) {
+				fatal("-b requires a non-negative number");
+			}
+			break;
+		case 'c':
+			keyfile = isc_commandline_argument;
+			break;
+		case 'h':
+			usage(0);
+		case 'k':
+		case 'y': /* Compatible with rndc -y. */
+			keyname = isc_commandline_argument;
+			break;
+		case 'M':
+			isc_mem_debugging = ISC_MEM_DEBUGTRACE;
+			break;
+
+		case 'm':
+			show_final_mem = true;
+			break;
+		case 'p':
+			port = strtol(isc_commandline_argument, &p, 10);
+			if (*p != '\0' || port < 0 || port > 65535) {
+				fatal("port '%s' out of range",
+				      isc_commandline_argument);
+			}
+			break;
+		case 'q':
+			quiet = true;
+			break;
+		case 'r':
+			fatal("The -r option has been deprecated.");
+			break;
+		case 's':
+			serveraddr = isc_commandline_argument;
+			if (inet_pton(AF_INET, serveraddr, &addr4_dummy) != 1 &&
+			    inet_pton(AF_INET6, serveraddr, &addr6_dummy) != 1)
+			{
+				fatal("-s should be an IPv4 or IPv6 address");
+			}
+			break;
+		case 't':
+			chrootdir = isc_commandline_argument;
+			break;
+		case 'u':
+			user = isc_commandline_argument;
+			break;
+		case 'V':
+			verbose = true;
+			break;
+		case '?':
+			if (isc_commandline_option != '?') {
+				fprintf(stderr, "%s: invalid argument -%c\n",
+					program, isc_commandline_option);
+				usage(1);
+			} else {
+				usage(0);
+			}
+			break;
+		default:
+			fprintf(stderr, "%s: unhandled option -%c\n", program,
+				isc_commandline_option);
+			exit(1);
+		}
+	}
+
+	argc -= isc_commandline_index;
+	argv += isc_commandline_index;
+	POST(argv);
+
+	if (argc > 0) {
+		usage(1);
+	}
+
+	if (alg == DST_ALG_HMACMD5) {
+		fprintf(stderr, "warning: use of hmac-md5 for RNDC keys "
+				"is deprecated; hmac-sha256 is now "
+				"recommended.\n");
+	}
+
+	if (keysize < 0) {
+		keysize = alg_bits(alg);
+	}
+	algname = dst_hmac_algorithm_totext(alg);
+
+	isc_mem_create(&mctx);
+	isc_buffer_init(&key_txtbuffer, &key_txtsecret, sizeof(key_txtsecret));
+
+	generate_key(mctx, alg, keysize, &key_txtbuffer);
+
+	if (keyonly) {
+		write_key_file(keyfile, chrootdir == NULL ? user : NULL,
+			       keyname, &key_txtbuffer, alg);
+		if (!quiet) {
+			printf("wrote key file \"%s\"\n", keyfile);
+		}
+
+		if (chrootdir != NULL) {
+			char *buf;
+			len = strlen(chrootdir) + strlen(keyfile) + 2;
+			buf = isc_mem_get(mctx, len);
+			snprintf(buf, len, "%s%s%s", chrootdir,
+				 (*keyfile != '/') ? "/" : "", keyfile);
+
+			write_key_file(buf, user, keyname, &key_txtbuffer, alg);
+			if (!quiet) {
+				printf("wrote key file \"%s\"\n", buf);
+			}
+			isc_mem_put(mctx, buf, len);
+		}
+	} else {
+		printf("\
+# Start of rndc.conf\n\
+key \"%s\" {\n\
+	algorithm %s;\n\
+	secret \"%.*s\";\n\
+};\n\
+\n\
+options {\n\
+	default-key \"%s\";\n\
+	default-server %s;\n\
+	default-port %d;\n\
+};\n\
+# End of rndc.conf\n\
+\n\
+# Use with the following in named.conf, adjusting the allow list as needed:\n\
+# key \"%s\" {\n\
+# 	algorithm %s;\n\
+# 	secret \"%.*s\";\n\
+# };\n\
+# \n\
+# controls {\n\
+# 	inet %s port %d\n\
+# 		allow { %s; } keys { \"%s\"; };\n\
+# };\n\
+# End of named.conf\n",
+		       keyname, algname,
+		       (int)isc_buffer_usedlength(&key_txtbuffer),
+		       (char *)isc_buffer_base(&key_txtbuffer), keyname,
+		       serveraddr, port, keyname, algname,
+		       (int)isc_buffer_usedlength(&key_txtbuffer),
+		       (char *)isc_buffer_base(&key_txtbuffer), serveraddr,
+		       port, serveraddr, keyname);
+	}
+
+	if (show_final_mem) {
+		isc_mem_stats(mctx, stderr);
+	}
+
+	isc_mem_destroy(&mctx);
+
+	return (0);
+}
diff --git a/bin/confgen/rndc-confgen.rst b/bin/confgen/rndc-confgen.rst
new file mode 100644
index 0000000..0a91489
--- /dev/null
+++ b/bin/confgen/rndc-confgen.rst
@@ -0,0 +1,121 @@
+.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+..
+.. SPDX-License-Identifier: MPL-2.0
+..
+.. This Source Code Form is subject to the terms of the Mozilla Public
+.. License, v. 2.0.  If a copy of the MPL was not distributed with this
+.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
+..
+.. See the COPYRIGHT file distributed with this work for additional
+.. information regarding copyright ownership.
+
+.. highlight: console
+
+.. iscman:: rndc-confgen
+.. program:: rndc-confgen
+.. _man_rndc-confgen:
+
+rndc-confgen - rndc key generation tool
+---------------------------------------
+
+Synopsis
+~~~~~~~~
+
+:program:`rndc-confgen` [**-a**] [**-A** algorithm] [**-b** keysize] [**-c** keyfile] [**-h**] [**-k** keyname] [**-p** port] [**-s** address] [**-t** chrootdir] [**-u** user]
+
+Description
+~~~~~~~~~~~
+
+:program:`rndc-confgen` generates configuration files for :iscman:`rndc`. It can be
+used as a convenient alternative to writing the :iscman:`rndc.conf` file and
+the corresponding ``controls`` and ``key`` statements in :iscman:`named.conf`
+by hand. Alternatively, it can be run with the :option:`-a` option to set up a
+``rndc.key`` file and avoid the need for a :iscman:`rndc.conf` file and a
+``controls`` statement altogether.
+
+Options
+~~~~~~~
+
+.. option:: -a
+
+   This option sets automatic :iscman:`rndc` configuration, which creates a file
+   |rndc_key| that is read by both :iscman:`rndc` and :iscman:`named` on startup.
+   The ``rndc.key`` file defines a default command channel and
+   authentication key allowing :iscman:`rndc` to communicate with :iscman:`named` on
+   the local host with no further configuration.
+
+   If a more elaborate configuration than that generated by
+   :option:`rndc-confgen -a` is required, for example if rndc is to be used
+   remotely, run :program:`rndc-confgen` without the :option:`-a` option
+   and set up :iscman:`rndc.conf` and :iscman:`named.conf` as directed.
+
+.. option:: -A algorithm
+
+   This option specifies the algorithm to use for the TSIG key. Available choices
+   are: hmac-md5, hmac-sha1, hmac-sha224, hmac-sha256, hmac-sha384, and
+   hmac-sha512. The default is hmac-sha256.
+
+.. option:: -b keysize
+
+   This option specifies the size of the authentication key in bits. The size must be between
+   1 and 512 bits; the default is the hash size.
+
+.. option:: -c keyfile
+
+   This option is used with the :option:`-a` option to specify an alternate location for
+   ``rndc.key``.
+
+.. option:: -h
+
+   This option prints a short summary of the options and arguments to
+   :program:`rndc-confgen`.
+
+.. option:: -k keyname
+
+   This option specifies the key name of the :iscman:`rndc` authentication key. This must be a
+   valid domain name. The default is ``rndc-key``.
+
+.. option:: -p port
+
+   This option specifies the command channel port where :iscman:`named` listens for
+   connections from :iscman:`rndc`. The default is 953.
+
+.. option:: -q
+
+   This option prevets printing the written path in automatic configuration mode.
+
+.. option:: -s address
+
+   This option specifies the IP address where :iscman:`named` listens for command-channel
+   connections from :iscman:`rndc`. The default is the loopback address
+   127.0.0.1.
+
+.. option:: -t chrootdir
+
+   This option is used with the :option:`-a` option to specify a directory where :iscman:`named`
+   runs chrooted. An additional copy of the ``rndc.key`` is
+   written relative to this directory, so that it is found by the
+   chrooted :iscman:`named`.
+
+.. option:: -u user
+
+   This option is used with the :option:`-a` option to set the owner of the generated ``rndc.key`` file.
+   If :option:`-t` is also specified, only the file in the chroot
+   area has its owner changed.
+
+Examples
+~~~~~~~~
+
+To allow :iscman:`rndc` to be used with no manual configuration, run:
+
+``rndc-confgen -a``
+
+To print a sample :iscman:`rndc.conf` file and the corresponding ``controls`` and
+``key`` statements to be manually inserted into :iscman:`named.conf`, run:
+
+:program:`rndc-confgen`
+
+See Also
+~~~~~~~~
+
+:iscman:`rndc(8) <rndc>`, :iscman:`rndc.conf(5) <rndc.conf>`, :iscman:`named(8) <named>`, BIND 9 Administrator Reference Manual.
diff --git a/bin/confgen/tsig-keygen.c b/bin/confgen/tsig-keygen.c
new file mode 100644
index 0000000..b44f1a9
--- /dev/null
+++ b/bin/confgen/tsig-keygen.c
@@ -0,0 +1,301 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+/**
+ * tsig-keygen generates TSIG keys that can be used in named configuration
+ * files for dynamic DNS.
+ */
+
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+#include <isc/assertions.h>
+#include <isc/attributes.h>
+#include <isc/base64.h>
+#include <isc/buffer.h>
+#include <isc/commandline.h>
+#include <isc/file.h>
+#include <isc/mem.h>
+#include <isc/net.h>
+#include <isc/print.h>
+#include <isc/result.h>
+#include <isc/string.h>
+#include <isc/time.h>
+#include <isc/util.h>
+
+#include <dns/keyvalues.h>
+#include <dns/name.h>
+
+#include <dst/dst.h>
+
+#include <confgen/os.h>
+
+#include "keygen.h"
+#include "util.h"
+
+#define KEYGEN_DEFAULT	"tsig-key"
+#define CONFGEN_DEFAULT "ddns-key"
+
+static char program[256];
+const char *progname;
+static enum { progmode_keygen, progmode_confgen } progmode;
+bool verbose = false; /* needed by util.c but not used here */
+
+noreturn static void
+usage(int status);
+
+static void
+usage(int status) {
+	if (progmode == progmode_confgen) {
+		fprintf(stderr, "\
+Usage:\n\
+ %s [-a alg] [-k keyname] [-q] [-s name | -z zone]\n\
+  -a alg:        algorithm (default hmac-sha256)\n\
+  -k keyname:    name of the key as it will be used in named.conf\n\
+  -s name:       domain name to be updated using the created key\n\
+  -z zone:       name of the zone as it will be used in named.conf\n\
+  -q:            quiet mode: print the key, with no explanatory text\n",
+			progname);
+	} else {
+		fprintf(stderr, "\
+Usage:\n\
+ %s [-a alg] [keyname]\n\
+  -a alg:        algorithm (default hmac-sha256)\n\n",
+			progname);
+	}
+
+	exit(status);
+}
+
+int
+main(int argc, char **argv) {
+	isc_result_t result = ISC_R_SUCCESS;
+	bool show_final_mem = false;
+	bool quiet = false;
+	isc_buffer_t key_txtbuffer;
+	char key_txtsecret[256];
+	isc_mem_t *mctx = NULL;
+	const char *keyname = NULL;
+	const char *zone = NULL;
+	const char *self_domain = NULL;
+	char *keybuf = NULL;
+	dns_secalg_t alg = DST_ALG_HMACSHA256;
+	const char *algname;
+	int keysize = 256;
+	int len = 0;
+	int ch;
+
+	result = isc_file_progname(*argv, program, sizeof(program));
+	if (result != ISC_R_SUCCESS) {
+		memmove(program, "tsig-keygen", 11);
+	}
+	progname = program;
+
+	/*
+	 * Libtool doesn't preserve the program name prior to final
+	 * installation.  Remove the libtool prefix ("lt-").
+	 */
+	if (strncmp(progname, "lt-", 3) == 0) {
+		progname += 3;
+	}
+
+#define PROGCMP(X) \
+	(strcasecmp(progname, X) == 0 || strcasecmp(progname, X ".exe") == 0)
+
+	if (PROGCMP("tsig-keygen")) {
+		progmode = progmode_keygen;
+		quiet = true;
+	} else if (PROGCMP("ddns-confgen")) {
+		progmode = progmode_confgen;
+	} else {
+		UNREACHABLE();
+	}
+
+	isc_commandline_errprint = false;
+
+	while ((ch = isc_commandline_parse(argc, argv, "a:hk:Mmr:qs:y:z:")) !=
+	       -1)
+	{
+		switch (ch) {
+		case 'a':
+			algname = isc_commandline_argument;
+			alg = alg_fromtext(algname);
+			if (alg == DST_ALG_UNKNOWN) {
+				fatal("Unsupported algorithm '%s'", algname);
+			}
+			keysize = alg_bits(alg);
+			break;
+		case 'h':
+			usage(0);
+		case 'k':
+		case 'y':
+			if (progmode == progmode_confgen) {
+				keyname = isc_commandline_argument;
+			} else {
+				usage(1);
+			}
+			break;
+		case 'M':
+			isc_mem_debugging = ISC_MEM_DEBUGTRACE;
+			break;
+		case 'm':
+			show_final_mem = true;
+			break;
+		case 'q':
+			if (progmode == progmode_confgen) {
+				quiet = true;
+			} else {
+				usage(1);
+			}
+			break;
+		case 'r':
+			fatal("The -r option has been deprecated.");
+			break;
+		case 's':
+			if (progmode == progmode_confgen) {
+				self_domain = isc_commandline_argument;
+			} else {
+				usage(1);
+			}
+			break;
+		case 'z':
+			if (progmode == progmode_confgen) {
+				zone = isc_commandline_argument;
+			} else {
+				usage(1);
+			}
+			break;
+		case '?':
+			if (isc_commandline_option != '?') {
+				fprintf(stderr, "%s: invalid argument -%c\n",
+					program, isc_commandline_option);
+				usage(1);
+			} else {
+				usage(0);
+			}
+			break;
+		default:
+			fprintf(stderr, "%s: unhandled option -%c\n", program,
+				isc_commandline_option);
+			exit(1);
+		}
+	}
+
+	if (progmode == progmode_keygen) {
+		keyname = argv[isc_commandline_index++];
+	}
+
+	POST(argv);
+
+	if (self_domain != NULL && zone != NULL) {
+		usage(1); /* -s and -z cannot coexist */
+	}
+
+	if (argc > isc_commandline_index) {
+		usage(1);
+	}
+
+	/* Use canonical algorithm name */
+	algname = dst_hmac_algorithm_totext(alg);
+
+	isc_mem_create(&mctx);
+
+	if (keyname == NULL) {
+		const char *suffix = NULL;
+
+		keyname = ((progmode == progmode_keygen) ? KEYGEN_DEFAULT
+							 : CONFGEN_DEFAULT);
+		if (self_domain != NULL) {
+			suffix = self_domain;
+		} else if (zone != NULL) {
+			suffix = zone;
+		}
+		if (suffix != NULL) {
+			len = strlen(keyname) + strlen(suffix) + 2;
+			keybuf = isc_mem_get(mctx, len);
+			snprintf(keybuf, len, "%s.%s", keyname, suffix);
+			keyname = (const char *)keybuf;
+		}
+	}
+
+	isc_buffer_init(&key_txtbuffer, &key_txtsecret, sizeof(key_txtsecret));
+
+	generate_key(mctx, alg, keysize, &key_txtbuffer);
+
+	if (!quiet) {
+		printf("\
+# To activate this key, place the following in named.conf, and\n\
+# in a separate keyfile on the system or systems from which nsupdate\n\
+# will be run:\n");
+	}
+
+	printf("\
+key \"%s\" {\n\
+	algorithm %s;\n\
+	secret \"%.*s\";\n\
+};\n",
+	       keyname, algname, (int)isc_buffer_usedlength(&key_txtbuffer),
+	       (char *)isc_buffer_base(&key_txtbuffer));
+
+	if (!quiet) {
+		if (self_domain != NULL) {
+			printf("\n\
+# Then, in the \"zone\" statement for the zone containing the\n\
+# name \"%s\", place an \"update-policy\" statement\n\
+# like this one, adjusted as needed for your preferred permissions:\n\
+update-policy {\n\
+	  grant %s name %s ANY;\n\
+};\n",
+			       self_domain, keyname, self_domain);
+		} else if (zone != NULL) {
+			printf("\n\
+# Then, in the \"zone\" definition statement for \"%s\",\n\
+# place an \"update-policy\" statement like this one, adjusted as \n\
+# needed for your preferred permissions:\n\
+update-policy {\n\
+	  grant %s zonesub ANY;\n\
+};\n",
+			       zone, keyname);
+		} else {
+			printf("\n\
+# Then, in the \"zone\" statement for each zone you wish to dynamically\n\
+# update, place an \"update-policy\" statement granting update permission\n\
+# to this key.  For example, the following statement grants this key\n\
+# permission to update any name within the zone:\n\
+update-policy {\n\
+	grant %s zonesub ANY;\n\
+};\n",
+			       keyname);
+		}
+
+		printf("\n\
+# After the keyfile has been placed, the following command will\n\
+# execute nsupdate using this key:\n\
+nsupdate -k <keyfile>\n");
+	}
+
+	if (keybuf != NULL) {
+		isc_mem_put(mctx, keybuf, len);
+	}
+
+	if (show_final_mem) {
+		isc_mem_stats(mctx, stderr);
+	}
+
+	isc_mem_destroy(&mctx);
+
+	return (0);
+}
diff --git a/bin/confgen/tsig-keygen.rst b/bin/confgen/tsig-keygen.rst
new file mode 100644
index 0000000..7420bed
--- /dev/null
+++ b/bin/confgen/tsig-keygen.rst
@@ -0,0 +1,54 @@
+.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+..
+.. SPDX-License-Identifier: MPL-2.0
+..
+.. This Source Code Form is subject to the terms of the Mozilla Public
+.. License, v. 2.0.  If a copy of the MPL was not distributed with this
+.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
+..
+.. See the COPYRIGHT file distributed with this work for additional
+.. information regarding copyright ownership.
+
+.. highlight: console
+
+.. BEWARE: Do not forget to edit also ddns-confgen.rst!
+
+.. iscman:: tsig-keygen
+.. program:: tsig-keygen
+.. _man_tsig-keygen:
+
+tsig-keygen - TSIG key generation tool
+--------------------------------------
+
+Synopsis
+~~~~~~~~
+:program:`tsig-keygen` [**-a** algorithm] [**-h**] [name]
+
+Description
+~~~~~~~~~~~
+
+:program:`tsig-keygen` is an utility that generates keys for use in TSIG signing.
+The resulting keys can be used, for example, to secure dynamic DNS updates
+to a zone, or for the :iscman:`rndc` command channel.
+
+A domain name can be specified on the command line to be used as the name
+of the generated key. If no name is specified, the default is ``tsig-key``.
+
+Options
+~~~~~~~
+
+.. option:: -a algorithm
+
+   This option specifies the algorithm to use for the TSIG key. Available
+   choices are: hmac-md5, hmac-sha1, hmac-sha224, hmac-sha256, hmac-sha384,
+   and hmac-sha512. The default is hmac-sha256. Options are
+   case-insensitive, and the "hmac-" prefix may be omitted.
+
+.. option:: -h
+
+   This option prints a short summary of options and arguments.
+
+See Also
+~~~~~~~~
+
+:iscman:`nsupdate(1) <nsupdate>`, :iscman:`named.conf(5) <named.conf>`, :iscman:`named(8) <named>`, BIND 9 Administrator Reference Manual.
diff --git a/bin/confgen/util.c b/bin/confgen/util.c
new file mode 100644
index 0000000..b0085fe
--- /dev/null
+++ b/bin/confgen/util.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include "util.h"
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <isc/print.h>
+
+extern bool verbose;
+extern const char *progname;
+
+void
+notify(const char *fmt, ...) {
+	va_list ap;
+
+	if (verbose) {
+		va_start(ap, fmt);
+		vfprintf(stderr, fmt, ap);
+		va_end(ap);
+		fprintf(stderr, "\n");
+	}
+}
+
+void
+fatal(const char *format, ...) {
+	va_list args;
+
+	fprintf(stderr, "%s: ", progname);
+	va_start(args, format);
+	vfprintf(stderr, format, args);
+	va_end(args);
+	fprintf(stderr, "\n");
+	exit(1);
+}
diff --git a/bin/confgen/util.h b/bin/confgen/util.h
new file mode 100644
index 0000000..4ac83e5
--- /dev/null
+++ b/bin/confgen/util.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#pragma once
+
+/*! \file */
+
+#include <isc/attributes.h>
+#include <isc/formatcheck.h>
+#include <isc/lang.h>
+
+#define NS_CONTROL_PORT 953
+
+#undef DO
+#define DO(name, function)                                                \
+	do {                                                              \
+		result = function;                                        \
+		if (result != ISC_R_SUCCESS)                              \
+			fatal("%s: %s", name, isc_result_totext(result)); \
+		else                                                      \
+			notify("%s", name);                               \
+	} while (0)
+
+ISC_LANG_BEGINDECLS
+
+void
+notify(const char *fmt, ...) ISC_FORMAT_PRINTF(1, 2);
+
+noreturn void
+fatal(const char *format, ...) ISC_FORMAT_PRINTF(1, 2);
+
+ISC_LANG_ENDDECLS