325 lines
8.6 KiB
C
325 lines
8.6 KiB
C
/*
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* Copyright (C) 2004 Internet Systems Consortium, Inc. ("ISC")
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* Copyright (C) 2001, 2003 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $Id: rndc-confgen.c,v 1.9.2.6.2.5 2004/09/28 07:14:57 marka Exp $ */
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#include <config.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <isc/assertions.h>
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#include <isc/base64.h>
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#include <isc/buffer.h>
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#include <isc/commandline.h>
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#include <isc/entropy.h>
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#include <isc/file.h>
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#include <isc/keyboard.h>
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#include <isc/mem.h>
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#include <isc/net.h>
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#include <isc/print.h>
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#include <isc/result.h>
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#include <isc/string.h>
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#include <isc/time.h>
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#include <isc/util.h>
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#include <dns/keyvalues.h>
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#include <dns/name.h>
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#include <dst/dst.h>
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#include <rndc/os.h>
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#include "util.h"
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#define DEFAULT_KEYLENGTH 128 /* Bits. */
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#define DEFAULT_KEYNAME "rndc-key"
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#define DEFAULT_SERVER "127.0.0.1"
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#define DEFAULT_PORT 953
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static char program[256];
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char *progname;
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isc_boolean_t verbose = ISC_FALSE;
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const char *keyfile, *keydef;
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static void
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usage(int status) {
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fprintf(stderr, "\
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Usage:\n\
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%s [-a] [-b bits] [-c keyfile] [-k keyname] [-p port] [-r randomfile] \
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[-s addr] [-t chrootdir] [-u user]\n\
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-a: generate just the key clause and write it to keyfile (%s)\n\
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-b bits: from 1 through 512, default %d; total length of the secret\n\
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-c keyfile: specify an alternate key file (requires -a)\n\
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-k keyname: the name as it will be used in named.conf and rndc.conf\n\
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-p port: the port named will listen on and rndc will connect to\n\
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-r randomfile: a file containing random data\n\
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-s addr: the address to which rndc should connect\n\
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-t chrootdir: write a keyfile in chrootdir as well (requires -a)\n\
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-u user: set the keyfile owner to \"user\" (requires -a)\n",
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progname, keydef, DEFAULT_KEYLENGTH);
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exit (status);
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}
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/*
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* Write an rndc.key file to 'keyfile'. If 'user' is non-NULL,
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* make that user the owner of the file. The key will have
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* the name 'keyname' and the secret in the buffer 'secret'.
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*/
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static void
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write_key_file(const char *keyfile, const char *user,
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const char *keyname, isc_buffer_t *secret )
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{
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FILE *fd;
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fd = safe_create(keyfile);
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if (fd == NULL)
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fatal( "unable to create \"%s\"\n", keyfile);
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if (user != NULL) {
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if (set_user(fd, user) == -1)
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fatal("unable to set file owner\n");
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}
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fprintf(fd, "key \"%s\" {\n\talgorithm hmac-md5;\n"
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"\tsecret \"%.*s\";\n};\n", keyname,
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(int)isc_buffer_usedlength(secret),
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(char *)isc_buffer_base(secret));
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fflush(fd);
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if (ferror(fd))
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fatal("write to %s failed\n", keyfile);
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if (fclose(fd))
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fatal("fclose(%s) failed\n", keyfile);
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fprintf(stderr, "wrote key file \"%s\"\n", keyfile);
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}
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int
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main(int argc, char **argv) {
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isc_boolean_t show_final_mem = ISC_FALSE;
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isc_buffer_t key_rawbuffer;
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isc_buffer_t key_txtbuffer;
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isc_region_t key_rawregion;
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isc_mem_t *mctx = NULL;
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isc_entropy_t *ectx = NULL;
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isc_entropysource_t *entropy_source = NULL;
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isc_result_t result = ISC_R_SUCCESS;
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dst_key_t *key = NULL;
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const char *keyname = NULL;
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const char *randomfile = NULL;
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const char *serveraddr = NULL;
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char key_rawsecret[64];
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char key_txtsecret[256];
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char *p;
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int ch;
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int port;
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int keysize;
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int entropy_flags = 0;
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int open_keyboard = ISC_ENTROPY_KEYBOARDMAYBE;
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struct in_addr addr4_dummy;
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struct in6_addr addr6_dummy;
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char *chrootdir = NULL;
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char *user = NULL;
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isc_boolean_t keyonly = ISC_FALSE;
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int len;
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keydef = keyfile = RNDC_KEYFILE;
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result = isc_file_progname(*argv, program, sizeof(program));
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if (result != ISC_R_SUCCESS)
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memcpy(program, "rndc-confgen", 13);
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progname = program;
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keyname = DEFAULT_KEYNAME;
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keysize = DEFAULT_KEYLENGTH;
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serveraddr = DEFAULT_SERVER;
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port = DEFAULT_PORT;
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while ((ch = isc_commandline_parse(argc, argv,
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"ab:c:hk:Mmp:r:s:t:u:Vy")) != -1) {
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switch (ch) {
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case 'a':
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keyonly = ISC_TRUE;
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break;
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case 'b':
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keysize = strtol(isc_commandline_argument, &p, 10);
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if (*p != '\0' || keysize < 0)
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fatal("-b requires a non-negative number");
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if (keysize < 1 || keysize > 512)
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fatal("-b must be in the range 1 through 512");
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break;
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case 'c':
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keyfile = isc_commandline_argument;
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break;
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case 'h':
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usage(0);
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case 'k':
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case 'y': /* Compatible with rndc -y. */
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keyname = isc_commandline_argument;
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break;
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case 'M':
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isc_mem_debugging = ISC_MEM_DEBUGTRACE;
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break;
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case 'm':
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show_final_mem = ISC_TRUE;
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break;
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case 'p':
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port = strtol(isc_commandline_argument, &p, 10);
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if (*p != '\0' || port < 0 || port > 65535)
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fatal("port '%s' out of range",
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isc_commandline_argument);
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break;
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case 'r':
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randomfile = isc_commandline_argument;
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break;
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case 's':
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serveraddr = isc_commandline_argument;
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if (inet_pton(AF_INET, serveraddr, &addr4_dummy) != 1 &&
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inet_pton(AF_INET6, serveraddr, &addr6_dummy) != 1)
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fatal("-s should be an IPv4 or IPv6 address");
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break;
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case 't':
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chrootdir = isc_commandline_argument;
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break;
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case 'u':
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user = isc_commandline_argument;
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break;
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case 'V':
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verbose = ISC_TRUE;
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break;
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case '?':
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usage(1);
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break;
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default:
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fatal("unexpected error parsing command arguments: "
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"got %c\n", ch);
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break;
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}
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}
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argc -= isc_commandline_index;
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argv += isc_commandline_index;
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if (argc > 0)
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usage(1);
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DO("create memory context", isc_mem_create(0, 0, &mctx));
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DO("create entropy context", isc_entropy_create(mctx, &ectx));
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if (randomfile != NULL && strcmp(randomfile, "keyboard") == 0) {
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randomfile = NULL;
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open_keyboard = ISC_ENTROPY_KEYBOARDYES;
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}
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DO("start entropy source", isc_entropy_usebestsource(ectx,
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&entropy_source,
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randomfile,
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open_keyboard));
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entropy_flags = ISC_ENTROPY_BLOCKING | ISC_ENTROPY_GOODONLY;
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DO("initialize dst library", dst_lib_init(mctx, ectx, entropy_flags));
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DO("generate key", dst_key_generate(dns_rootname, DST_ALG_HMACMD5,
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keysize, 0, 0,
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DNS_KEYPROTO_ANY,
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dns_rdataclass_in, mctx, &key));
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isc_buffer_init(&key_rawbuffer, &key_rawsecret, sizeof(key_rawsecret));
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DO("dump key to buffer", dst_key_tobuffer(key, &key_rawbuffer));
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isc_buffer_init(&key_txtbuffer, &key_txtsecret, sizeof(key_txtsecret));
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isc_buffer_usedregion(&key_rawbuffer, &key_rawregion);
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DO("bsse64 encode secret", isc_base64_totext(&key_rawregion, -1, "",
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&key_txtbuffer));
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/*
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* Shut down the entropy source now so the "stop typing" message
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* does not muck with the output.
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*/
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if (entropy_source != NULL)
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isc_entropy_destroysource(&entropy_source);
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if (key != NULL)
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dst_key_free(&key);
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isc_entropy_detach(&ectx);
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dst_lib_destroy();
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if (keyonly) {
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write_key_file(keyfile, chrootdir == NULL ? user : NULL,
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keyname, &key_txtbuffer);
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if (chrootdir != NULL) {
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char *buf;
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len = strlen(chrootdir) + strlen(keyfile) + 2;
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buf = isc_mem_get(mctx, len);
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if (buf == NULL)
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fatal("isc_mem_get(%d) failed\n", len);
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snprintf(buf, len, "%s%s%s", chrootdir,
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(*keyfile != '/') ? "/" : "", keyfile);
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write_key_file(buf, user, keyname, &key_txtbuffer);
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isc_mem_put(mctx, buf, len);
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}
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} else {
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printf("\
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# Start of rndc.conf\n\
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key \"%s\" {\n\
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algorithm hmac-md5;\n\
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secret \"%.*s\";\n\
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};\n\
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\n\
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options {\n\
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default-key \"%s\";\n\
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default-server %s;\n\
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default-port %d;\n\
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};\n\
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# End of rndc.conf\n\
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\n\
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# Use with the following in named.conf, adjusting the allow list as needed:\n\
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# key \"%s\" {\n\
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# algorithm hmac-md5;\n\
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# secret \"%.*s\";\n\
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# };\n\
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# \n\
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# controls {\n\
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# inet %s port %d\n\
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# allow { %s; } keys { \"%s\"; };\n\
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# };\n\
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# End of named.conf\n",
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keyname,
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(int)isc_buffer_usedlength(&key_txtbuffer),
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(char *)isc_buffer_base(&key_txtbuffer),
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keyname, serveraddr, port,
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keyname,
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(int)isc_buffer_usedlength(&key_txtbuffer),
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(char *)isc_buffer_base(&key_txtbuffer),
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serveraddr, port, serveraddr, keyname);
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}
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if (show_final_mem)
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isc_mem_stats(mctx, stderr);
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isc_mem_destroy(&mctx);
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return (0);
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}
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