398 lines
9.8 KiB
C
398 lines
9.8 KiB
C
/*
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* Copyright (C) 2014-2016 Andreas Steffen
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* HSR Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "tpm_tss.h"
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#include <library.h>
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#include <utils/debug.h>
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#include <utils/optionsfrom.h>
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#include <credentials/certificates/x509.h>
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#include <credentials/keys/public_key.h>
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#include <syslog.h>
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#include <getopt.h>
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#include <errno.h>
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/* default directory where AIK keys are stored */
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#define AIK_DIR IPSEC_CONFDIR "/pts/"
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/* default name of AIK private key blob */
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#define DEFAULT_FILENAME_AIKBLOB AIK_DIR "aikBlob.bin"
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/* default name of AIK public key */
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#define DEFAULT_FILENAME_AIKPUBKEY AIK_DIR "aikPub.der"
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/* logging */
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static bool log_to_stderr = TRUE;
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static bool log_to_syslog = TRUE;
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static level_t default_loglevel = 1;
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/* options read by optionsfrom */
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options_t *options;
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/* global variables */
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certificate_t *cacert;
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public_key_t *ca_pubkey;
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chunk_t ca_modulus;
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chunk_t aik_pubkey;
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chunk_t aik_keyid;
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tpm_tss_t *tpm;
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/**
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* logging function for aikgen
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*/
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static void aikgen_dbg(debug_t group, level_t level, char *fmt, ...)
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{
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char buffer[8192];
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char *current = buffer, *next;
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va_list args;
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if (level <= default_loglevel)
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{
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if (log_to_stderr)
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{
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va_start(args, fmt);
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vfprintf(stderr, fmt, args);
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va_end(args);
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fprintf(stderr, "\n");
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}
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if (log_to_syslog)
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{
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/* write in memory buffer first */
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va_start(args, fmt);
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vsnprintf(buffer, sizeof(buffer), fmt, args);
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va_end(args);
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/* do a syslog with every line */
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while (current)
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{
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next = strchr(current, '\n');
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if (next)
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{
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*(next++) = '\0';
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}
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syslog(LOG_INFO, "%s\n", current);
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current = next;
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}
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}
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}
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}
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/**
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* Initialize logging to stderr/syslog
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*/
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static void init_log(const char *program)
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{
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dbg = aikgen_dbg;
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if (log_to_stderr)
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{
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setbuf(stderr, NULL);
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}
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if (log_to_syslog)
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{
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openlog(program, LOG_CONS | LOG_NDELAY | LOG_PID, LOG_AUTHPRIV);
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}
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}
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/**
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* @brief exit aikgen
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*
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* @param status 0 = OK, -1 = general discomfort
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*/
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static void exit_aikgen(err_t message, ...)
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{
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int status = 0;
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DESTROY_IF(tpm);
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DESTROY_IF(cacert);
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DESTROY_IF(ca_pubkey);
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free(ca_modulus.ptr);
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free(aik_pubkey.ptr);
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free(aik_keyid.ptr);
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options->destroy(options);
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/* print any error message to stderr */
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if (message != NULL && *message != '\0')
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{
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va_list args;
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char m[8192];
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va_start(args, message);
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vsnprintf(m, sizeof(m), message, args);
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va_end(args);
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fprintf(stderr, "aikgen error: %s\n", m);
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status = -1;
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}
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library_deinit();
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exit(status);
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}
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/**
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* @brief prints the usage of the program to the stderr output
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*
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* If message is set, program is exited with 1 (error)
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* @param message message in case of an error
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*/
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static void usage(const char *message)
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{
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fprintf(stderr,
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"Usage: aikgen --cacert|capubkey <filename>"
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" [--aikblob <filename>] [--aikpubkey <filename>] \n"
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" [--idreq <filename>] [--force]"
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" [--quiet] [--debug <level>]\n"
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" aikgen --help\n"
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"\n"
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"Options:\n"
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" --cacert (-c) certificate of [privacy] CA\n"
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" --capubkey (-k) public key of [privacy] CA\n"
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" --aikblob (-b) encrypted blob with AIK private key\n"
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" --aikpubkey (-p) AIK public key\n"
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" --idreq (-i) encrypted identity request\n"
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" --force (-f) force to overwrite existing files\n"
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" --help (-h) show usage and exit\n"
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"\n"
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"Debugging output:\n"
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" --debug (-l) changes the log level (-1..4, default: 1)\n"
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" --quiet (-q) do not write log output to stderr\n"
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);
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exit_aikgen(message);
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}
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/**
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* @brief main of aikgen which generates an Attestation Identity Key (AIK)
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*
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* @param argc number of arguments
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* @param argv pointer to the argument values
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*/
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int main(int argc, char *argv[])
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{
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/* external values */
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extern char * optarg;
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extern int optind;
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char *cacert_filename = NULL;
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char *capubkey_filename = NULL;
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char *aikblob_filename = DEFAULT_FILENAME_AIKBLOB;
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char *aikpubkey_filename = DEFAULT_FILENAME_AIKPUBKEY;
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char *idreq_filename = NULL;
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bool force = FALSE;
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chunk_t identity_req;
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chunk_t aik_blob;
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hasher_t *hasher;
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atexit(library_deinit);
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if (!library_init(NULL, "aikgen"))
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{
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exit(SS_RC_LIBSTRONGSWAN_INTEGRITY);
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}
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if (lib->integrity &&
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!lib->integrity->check_file(lib->integrity, "aikgen", argv[0]))
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{
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fprintf(stderr, "integrity check of aikgen failed\n");
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exit(SS_RC_DAEMON_INTEGRITY);
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}
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/* initialize global variables */
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options = options_create();
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for (;;)
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{
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static const struct option long_opts[] = {
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/* name, has_arg, flag, val */
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{ "help", no_argument, NULL, 'h' },
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{ "optionsfrom", required_argument, NULL, '+' },
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{ "cacert", required_argument, NULL, 'c' },
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{ "capubkey", required_argument, NULL, 'k' },
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{ "aikblob", required_argument, NULL, 'b' },
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{ "aikpubkey", required_argument, NULL, 'p' },
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{ "idreq", required_argument, NULL, 'i' },
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{ "force", no_argument, NULL, 'f' },
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{ "quiet", no_argument, NULL, 'q' },
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{ "debug", required_argument, NULL, 'l' },
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{ 0,0,0,0 }
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};
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/* parse next option */
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int c = getopt_long(argc, argv, "ho:c:b:p:fqd:", long_opts, NULL);
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switch (c)
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{
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case EOF: /* end of flags */
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break;
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case 'h': /* --help */
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usage(NULL);
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case '+': /* --optionsfrom <filename> */
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if (!options->from(options, optarg, &argc, &argv, optind))
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{
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exit_aikgen("optionsfrom failed");
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}
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continue;
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case 'c': /* --cacert <filename> */
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cacert_filename = optarg;
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continue;
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case 'k': /* --capubkey <filename> */
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capubkey_filename = optarg;
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continue;
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case 'b': /* --aikblob <filename> */
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aikblob_filename = optarg;
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continue;
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case 'p': /* --aikpubkey <filename> */
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aikpubkey_filename = optarg;
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continue;
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case 'i': /* --idreq <filename> */
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idreq_filename = optarg;
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continue;
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case 'f': /* --force */
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force = TRUE;
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continue;
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case 'q': /* --quiet */
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log_to_stderr = FALSE;
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continue;
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case 'l': /* --debug <level> */
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default_loglevel = atoi(optarg);
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continue;
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default:
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usage("unknown option");
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}
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/* break from loop */
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break;
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}
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init_log("aikgen");
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if (!lib->plugins->load(lib->plugins,
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lib->settings->get_str(lib->settings, "aikgen.load", PLUGINS)))
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{
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exit_aikgen("plugin loading failed");
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}
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/* read certificate of [privacy] CA if it exists */
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if (cacert_filename)
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{
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cacert = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509,
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BUILD_FROM_FILE, cacert_filename, BUILD_END);
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if (!cacert)
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{
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exit_aikgen("could not read ca certificate file '%s'",
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cacert_filename);
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}
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}
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/* optionally read public key of [privacy CA] if it exists */
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if (!cacert)
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{
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if (!capubkey_filename)
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{
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usage("either --cacert or --capubkey option is required");
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}
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cacert = lib->creds->create(lib->creds, CRED_CERTIFICATE,
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CERT_TRUSTED_PUBKEY, BUILD_FROM_FILE,
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capubkey_filename, BUILD_END);
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if (!cacert)
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{
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exit_aikgen("could not read ca public key file '%s'",
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capubkey_filename);
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}
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}
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/* extract public key from CA certificate or trusted CA public key */
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ca_pubkey = cacert->get_public_key(cacert);
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if (!ca_pubkey)
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{
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exit_aikgen("could not extract ca public key");
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}
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if (ca_pubkey->get_type(ca_pubkey) != KEY_RSA ||
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ca_pubkey->get_keysize(ca_pubkey) != 2048)
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{
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exit_aikgen("CA public key must be RSA 2048 but is %N %d",
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key_type_names, ca_pubkey->get_type(ca_pubkey),
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ca_pubkey->get_keysize(ca_pubkey));
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}
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if (!ca_pubkey->get_encoding(ca_pubkey, PUBKEY_RSA_MODULUS, &ca_modulus))
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{
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exit_aikgen("could not extract RSA modulus from CA public key");
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}
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/* try to find a TPM 1.2 */
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tpm = tpm_tss_probe(TPM_VERSION_1_2);
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if (!tpm)
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{
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exit_aikgen("no TPM 1.2 found");
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}
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if (!tpm->generate_aik(tpm, ca_modulus, &aik_blob, &aik_pubkey,
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&identity_req))
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{
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exit_aikgen("could not generate AIK");
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}
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/* optionally output identity request encrypted with CA public key */
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if (idreq_filename)
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{
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if (!chunk_write(identity_req, idreq_filename, 0022, force))
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{
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exit_aikgen("could not write AIK identity request file '%s': %s",
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idreq_filename, strerror(errno));
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}
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DBG1(DBG_LIB, "AIK identity request written to '%s' (%u bytes)",
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idreq_filename, identity_req.len);
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}
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/* output AIK private key blob */
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if (!chunk_write(aik_blob, aikblob_filename, 0022, force))
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{
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exit_aikgen("could not write AIK blob file '%s': %s",
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aikblob_filename, strerror(errno));
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}
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DBG1(DBG_LIB, "AIK private key blob written to '%s' (%u bytes)",
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aikblob_filename, aik_blob.len);
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/* output AIK public key */
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if (!chunk_write(aik_pubkey, aikpubkey_filename, 0022, force))
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{
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exit_aikgen("could not write AIK public key file '%s': %s",
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aikpubkey_filename, strerror(errno));
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}
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DBG1(DBG_LIB, "AIK public key written to '%s' (%u bytes)",
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aikpubkey_filename, aik_pubkey.len);
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/* display AIK keyid derived from subjectPublicKeyInfo encoding */
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hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
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if (!hasher || !hasher->allocate_hash(hasher, aik_pubkey, &aik_keyid))
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{
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DESTROY_IF(hasher);
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exit_aikgen("SHA1 hash algorithm not supported, computation of AIK "
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"keyid failed");
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}
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hasher->destroy(hasher);
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DBG1(DBG_LIB, "AIK keyid: %#B", &aik_keyid);
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exit_aikgen(NULL);
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return -1; /* should never be reached */
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}
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