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strongswan/src/aikgen/aikgen.c

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/*
* Copyright (C) 2014 Andreas Steffen
* HSR Hochschule fuer Technik Rapperswil
*
* Copyright (c) 2008 Hal Finney
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <library.h>
#include <utils/debug.h>
#include <utils/optionsfrom.h>
#include <credentials/certificates/x509.h>
#include <credentials/keys/public_key.h>
#include <asn1/oid.h>
#include <asn1/asn1.h>
#include <trousers/tss.h>
#include <trousers/trousers.h>
#include <syslog.h>
#include <getopt.h>
#include <errno.h>
/* default directory where AIK keys are stored */
#define AIK_DIR IPSEC_CONFDIR "/pts/"
/* default name of AIK private key blob */
#define DEFAULT_FILENAME_AIKBLOB AIK_DIR "aikBlob.bin"
/* default name of AIK private key blob */
#define DEFAULT_FILENAME_AIKPUBKEY AIK_DIR "aikPub.der"
/* size in bytes of a TSS AIK public key blob */
#define AIK_PUBKEY_BLOB_SIZE 284
/* logging */
static bool log_to_stderr = TRUE;
static bool log_to_syslog = TRUE;
static level_t default_loglevel = 1;
/* options read by optionsfrom */
options_t *options;
/* global variables */
certificate_t *cacert;
public_key_t *ca_pubkey;
chunk_t ca_modulus;
chunk_t aik_pubkey;
chunk_t aik_keyid;
/* TPM context */
TSS_HCONTEXT hContext;
/**
* logging function for aikgen
*/
static void aikgen_dbg(debug_t group, level_t level, char *fmt, ...)
{
char buffer[8192];
char *current = buffer, *next;
va_list args;
if (level <= default_loglevel)
{
if (log_to_stderr)
{
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
fprintf(stderr, "\n");
}
if (log_to_syslog)
{
/* write in memory buffer first */
va_start(args, fmt);
vsnprintf(buffer, sizeof(buffer), fmt, args);
va_end(args);
/* do a syslog with every line */
while (current)
{
next = strchr(current, '\n');
if (next)
{
*(next++) = '\0';
}
syslog(LOG_INFO, "%s\n", current);
current = next;
}
}
}
}
/**
* Initialize logging to stderr/syslog
*/
static void init_log(const char *program)
{
dbg = aikgen_dbg;
if (log_to_stderr)
{
setbuf(stderr, NULL);
}
if (log_to_syslog)
{
openlog(program, LOG_CONS | LOG_NDELAY | LOG_PID, LOG_AUTHPRIV);
}
}
/**
* @brief exit aikgen
*
* @param status 0 = OK, 1 = general discomfort
*/
static void exit_aikgen(err_t message, ...)
{
int status = 0;
DESTROY_IF(cacert);
DESTROY_IF(ca_pubkey);
free(ca_modulus.ptr);
free(aik_pubkey.ptr);
free(aik_keyid.ptr);
options->destroy(options);
/* clean up TPM context */
if (hContext)
{
Tspi_Context_FreeMemory(hContext, NULL);
Tspi_Context_Close(hContext);
}
/* print any error message to stderr */
if (message != NULL && *message != '\0')
{
va_list args;
char m[8192];
va_start(args, message);
vsnprintf(m, sizeof(m), message, args);
va_end(args);
fprintf(stderr, "error: %s\n", m);
status = -1;
}
library_deinit();
exit(status);
}
/**
* @brief prints the usage of the program to the stderr output
*
* If message is set, program is exited with 1 (error)
* @param message message in case of an error
*/
static void usage(const char *message)
{
fprintf(stderr,
"Usage: aikgen --cacert|capubkey <filename>"
" [--aikblob <filename>] [--aikpubkey <filename>] \n"
" [--idreq <filename>] [--force]"
" [--quiet] [--debug <level>]\n"
" aikgen --help\n"
"\n"
"Options:\n"
" --cacert (-c) certificate of [privacy] CA\n"
" --capubkey (-k) public key of [privacy] CA\n"
" --aikblob (-b) encrypted blob with AIK private key\n"
" --aikpubkey (-p) AIK public key\n"
" --idreq (-i) encrypted identity request\n"
" --force (-f) force to overwrite existing files\n"
" --help (-h) show usage and exit\n"
"\n"
"Debugging output:\n"
" --debug (-l) changes the log level (-1..4, default: 1)\n"
" --quiet (-q) do not write log output to stderr\n"
);
exit_aikgen(message);
}
/**
* @brief main of aikgen which generates an Attestation Identity Key (AIK)
*
* @param argc number of arguments
* @param argv pointer to the argument values
*/
int main(int argc, char *argv[])
{
/* external values */
extern char * optarg;
extern int optind;
char *cacert_filename = NULL;
char *capubkey_filename = NULL;
char *aikblob_filename = DEFAULT_FILENAME_AIKBLOB;
char *aikpubkey_filename = DEFAULT_FILENAME_AIKPUBKEY;
char *idreq_filename = NULL;
bool force = FALSE;
chunk_t identity_req;
chunk_t aik_blob;
chunk_t aik_pubkey_blob;
chunk_t aik_modulus;
chunk_t aik_exponent;
/* TPM variables */
TSS_RESULT result;
TSS_HTPM hTPM;
TSS_HKEY hSRK;
TSS_HKEY hPCAKey;
TSS_HPOLICY hSrkPolicy;
TSS_HPOLICY hTPMPolicy;
TSS_HKEY hIdentKey;
TSS_UUID SRK_UUID = TSS_UUID_SRK;
BYTE secret[] = TSS_WELL_KNOWN_SECRET;
BYTE *IdentityReq;
UINT32 IdentityReqLen;
BYTE *blob;
UINT32 blobLen;
atexit(library_deinit);
if (!library_init(NULL, "aikgen"))
{
exit(SS_RC_LIBSTRONGSWAN_INTEGRITY);
}
if (lib->integrity &&
!lib->integrity->check_file(lib->integrity, "aikgen", argv[0]))
{
fprintf(stderr, "integrity check of aikgen failed\n");
exit(SS_RC_DAEMON_INTEGRITY);
}
/* initialize global variables */
options = options_create();
for (;;)
{
static const struct option long_opts[] = {
/* name, has_arg, flag, val */
{ "help", no_argument, NULL, 'h' },
{ "optionsfrom", required_argument, NULL, '+' },
{ "cacert", required_argument, NULL, 'c' },
{ "capubkey", required_argument, NULL, 'k' },
{ "aikblob", required_argument, NULL, 'b' },
{ "aikpubkey", required_argument, NULL, 'p' },
{ "idreq", required_argument, NULL, 'i' },
{ "force", no_argument, NULL, 'f' },
{ "quiet", no_argument, NULL, 'q' },
{ "debug", required_argument, NULL, 'l' },
{ 0,0,0,0 }
};
/* parse next option */
int c = getopt_long(argc, argv, "ho:c:b:p:fqd:", long_opts, NULL);
switch (c)
{
case EOF: /* end of flags */
break;
case 'h': /* --help */
usage(NULL);
case '+': /* --optionsfrom <filename> */
if (!options->from(options, optarg, &argc, &argv, optind))
{
exit_aikgen("optionsfrom failed");
}
continue;
case 'c': /* --cacert <filename> */
cacert_filename = optarg;
continue;
case 'k': /* --capubkey <filename> */
capubkey_filename = optarg;
continue;
case 'b': /* --aikblob <filename> */
aikblob_filename = optarg;
continue;
case 'p': /* --aikpubkey <filename> */
aikpubkey_filename = optarg;
continue;
case 'i': /* --idreq <filename> */
idreq_filename = optarg;
continue;
case 'f': /* --force */
force = TRUE;
continue;
case 'q': /* --quiet */
log_to_stderr = FALSE;
continue;
case 'l': /* --debug <level> */
default_loglevel = atoi(optarg);
continue;
default:
usage("unknown option");
}
/* break from loop */
break;
}
init_log("aikgen");
if (!lib->plugins->load(lib->plugins,
lib->settings->get_str(lib->settings, "aikgen.load", PLUGINS)))
{
exit_aikgen("plugin loading failed");
}
/* read certificate of [privacy] CA if it exists */
if (cacert_filename)
{
cacert = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509,
BUILD_FROM_FILE, cacert_filename, BUILD_END);
if (!cacert)
{
exit_aikgen("could not read ca certificate file '%s'",
cacert_filename);
}
}
/* optionally read public key of [privacy CA] if it exists */
if (!cacert)
{
if (!capubkey_filename)
{
usage("either --cacert or --capubkey option is required");
}
cacert = lib->creds->create(lib->creds, CRED_CERTIFICATE,
CERT_TRUSTED_PUBKEY, BUILD_FROM_FILE,
capubkey_filename, BUILD_END);
if (!cacert)
{
exit_aikgen("could not read ca public key file '%s'",
capubkey_filename);
}
}
/* extract public key from CA certificate or trusted CA public key */
ca_pubkey = cacert->get_public_key(cacert);
if (!ca_pubkey)
{
exit_aikgen("could not extract ca public key");
}
if (ca_pubkey->get_type(ca_pubkey) != KEY_RSA ||
ca_pubkey->get_keysize(ca_pubkey) != 2048)
{
exit_aikgen("ca public key must be RSA 2048 but is %N %d",
key_type_names, ca_pubkey->get_type(ca_pubkey),
ca_pubkey->get_keysize(ca_pubkey));
}
if (!ca_pubkey->get_encoding(ca_pubkey, PUBKEY_RSA_MODULUS, &ca_modulus))
{
exit_aikgen("could not extract RSA modulus from ca public key");
}
/* initialize TSS context and connect to it */
result = Tspi_Context_Create(&hContext);
if (result != TSS_SUCCESS)
{
exit_aikgen("tss 0x%x on Tspi_Context_Create", result);
}
result = Tspi_Context_Connect(hContext, NULL);
if (result != TSS_SUCCESS)
{
exit_aikgen("tss 0x%x on Tspi_Context_Connect", result);
}
/* get SRK plus SRK policy and set SRK secret */
result = Tspi_Context_LoadKeyByUUID(hContext, TSS_PS_TYPE_SYSTEM,
SRK_UUID, &hSRK);
if (result != TSS_SUCCESS)
{
exit_aikgen("tss 0x%x on Tspi_Context_LoadKeyByUUID for SRK", result);
}
result = Tspi_GetPolicyObject(hSRK, TSS_POLICY_USAGE, &hSrkPolicy);
if (result != TSS_SUCCESS)
{
exit_aikgen("tss 0x%x on Tspi_GetPolicyObject for SRK", result);
}
result = Tspi_Policy_SetSecret(hSrkPolicy, TSS_SECRET_MODE_SHA1, 20, secret);
if (result != TSS_SUCCESS)
{
exit_aikgen("tss 0x%x on Tspi_Policy_SetSecret for SRK", result);
}
/* get TPM plus TPM policy and set TPM secret */
result = Tspi_Context_GetTpmObject (hContext, &hTPM);
if (result != TSS_SUCCESS)
{
exit_aikgen("tss 0x%x on Tspi_Context_GetTpmObject", result);
}
result = Tspi_GetPolicyObject(hTPM, TSS_POLICY_USAGE, &hTPMPolicy);
if (result != TSS_SUCCESS)
{
exit_aikgen("tss 0x%x on Tspi_GetPolicyObject for TPM", result);
}
result = Tspi_Policy_SetSecret(hTPMPolicy, TSS_SECRET_MODE_SHA1, 20, secret);
if (result != TSS_SUCCESS)
{
exit_aikgen("tss 0x%x on Tspi_Policy_SetSecret for TPM", result);
}
/* create context for a 2048 bit AIK */
result = Tspi_Context_CreateObject(hContext, TSS_OBJECT_TYPE_RSAKEY,
TSS_KEY_TYPE_IDENTITY | TSS_KEY_SIZE_2048 |
TSS_KEY_VOLATILE | TSS_KEY_NOT_MIGRATABLE, &hIdentKey);
if (result != TSS_SUCCESS)
{
exit_aikgen("tss 0x%x on Tspi_Context_CreateObject for key", result);
}
/* create context for the Privacy CA public key and assign modulus */
result = Tspi_Context_CreateObject(hContext, TSS_OBJECT_TYPE_RSAKEY,
TSS_KEY_TYPE_LEGACY|TSS_KEY_SIZE_2048, &hPCAKey);
if (result != TSS_SUCCESS)
{
exit_aikgen("tss 0x%x on Tspi_Context_CreateObject for PCA", result);
}
result = Tspi_SetAttribData (hPCAKey, TSS_TSPATTRIB_RSAKEY_INFO,
TSS_TSPATTRIB_KEYINFO_RSA_MODULUS, ca_modulus.len,
ca_modulus.ptr);
if (result != TSS_SUCCESS)
{
exit_aikgen("tss 0x%x on Tspi_SetAttribData for PCA modulus", result);
}
result = Tspi_SetAttribUint32(hPCAKey, TSS_TSPATTRIB_KEY_INFO,
TSS_TSPATTRIB_KEYINFO_ENCSCHEME, TSS_ES_RSAESPKCSV15);
if (result != TSS_SUCCESS)
{
exit_aikgen("tss 0x%x on Tspi_SetAttribUint32 for PCA "
"encryption scheme", result);
}
/* generate AIK */
DBG1(DBG_LIB, "Generating identity key...");
result = Tspi_TPM_CollateIdentityRequest(hTPM, hSRK, hPCAKey, 0, NULL,
hIdentKey, TSS_ALG_AES, &IdentityReqLen, &IdentityReq);
if (result != TSS_SUCCESS)
{
exit_aikgen("tss 0x%x on Tspi_TPM_CollateIdentityRequest", result);
}
identity_req = chunk_create(IdentityReq, IdentityReqLen);
DBG3(DBG_LIB, "Identity Request: %B", &identity_req);
/* optionally output identity request encrypted with ca public key */
if (idreq_filename)
{
if (!chunk_write(identity_req, idreq_filename, 0022, force))
{
exit_aikgen("could not write AIK identity request file '%s': %s",
idreq_filename, strerror(errno));
}
DBG1(DBG_LIB, "AIK identity request written to '%s' (%u bytes)",
idreq_filename, identity_req.len);
}
/* load identity key */
result = Tspi_Key_LoadKey (hIdentKey, hSRK);
if (result != TSS_SUCCESS)
{
exit_aikgen("tss 0x%x on Tspi_Key_LoadKey for AIK\n", result);
}
/* output AIK private key in TSS blob format */
result = Tspi_GetAttribData (hIdentKey, TSS_TSPATTRIB_KEY_BLOB,
TSS_TSPATTRIB_KEYBLOB_BLOB, &blobLen, &blob);
if (result != TSS_SUCCESS)
{
exit_aikgen("tss 0x%x on Tspi_GetAttribData for private key blob",
result);
}
aik_blob = chunk_create(blob, blobLen);
DBG3(DBG_LIB, "AIK private key blob: %B", &aik_blob);
if (!chunk_write(aik_blob, aikblob_filename, 0022, force))
{
exit_aikgen("could not write AIK blob file '%s': %s",
aikblob_filename, strerror(errno));
}
DBG1(DBG_LIB, "AIK private key blob written to '%s' (%u bytes)",
aikblob_filename, aik_blob.len);
/* output AIK Public Key in TSS blob format */
result = Tspi_GetAttribData (hIdentKey, TSS_TSPATTRIB_KEY_BLOB,
TSS_TSPATTRIB_KEYBLOB_PUBLIC_KEY, &blobLen, &blob);
if (result != TSS_SUCCESS)
{
exit_aikgen("tss 0x%x on Tspi_GetAttribData for public key blob",
result);
}
aik_pubkey_blob = chunk_create(blob, blobLen);
DBG3(DBG_LIB, "AIK public key blob: %B", &aik_pubkey_blob);
/* create a trusted AIK public key */
if (aik_pubkey_blob.len != AIK_PUBKEY_BLOB_SIZE)
{
exit_aikgen("AIK public key is not in TSS blob format");
}
aik_modulus = chunk_skip(aik_pubkey_blob, AIK_PUBKEY_BLOB_SIZE - 256);
aik_exponent = chunk_from_chars(0x01, 0x00, 0x01);
/* output subjectPublicKeyInfo encoding of AIK public key */
if (!lib->encoding->encode(lib->encoding, PUBKEY_SPKI_ASN1_DER, NULL,
&aik_pubkey, CRED_PART_RSA_MODULUS, aik_modulus,
CRED_PART_RSA_PUB_EXP, aik_exponent, CRED_PART_END))
{
exit_aikgen("subjectPublicKeyInfo encoding of AIK key failed");
}
if (!chunk_write(aik_pubkey, aikpubkey_filename, 0022, force))
{
exit_aikgen("could not write AIK public key file '%s': %s",
aikpubkey_filename, strerror(errno));
}
DBG1(DBG_LIB, "AIK public key written to '%s' (%u bytes)",
aikpubkey_filename, aik_pubkey.len);
/* display AIK keyid derived from subjectPublicKeyInfo encoding */
if (!lib->encoding->encode(lib->encoding, KEYID_PUBKEY_INFO_SHA1, NULL,
&aik_keyid, CRED_PART_RSA_MODULUS, aik_modulus,
CRED_PART_RSA_PUB_EXP, aik_exponent, CRED_PART_END))
{
exit_aikgen("computation of AIK keyid failed");
}
DBG1(DBG_LIB, "AIK keyid: %#B", &aik_keyid);
exit_aikgen(NULL);
return -1; /* should never be reached */
}
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