diff options
Diffstat (limited to 'src/aikgen')
| -rw-r--r-- | src/aikgen/Makefile.am | 15 | ||||
| -rw-r--r-- | src/aikgen/Makefile.in | 731 | ||||
| -rw-r--r-- | src/aikgen/aikgen.c | 554 |
3 files changed, 1300 insertions, 0 deletions
diff --git a/src/aikgen/Makefile.am b/src/aikgen/Makefile.am new file mode 100644 index 000000000..dc59d20cf --- /dev/null +++ b/src/aikgen/Makefile.am @@ -0,0 +1,15 @@ +bin_PROGRAMS = aikgen + +aikgen_SOURCES = aikgen.c + +aikgen_LDADD = $(top_builddir)/src/libstrongswan/libstrongswan.la +aikgen.o : $(top_builddir)/config.status + +if USE_TROUSERS + aikgen_LDADD += -ltspi +endif + +AM_CPPFLAGS = \ + -I$(top_srcdir)/src/libstrongswan \ + -DIPSEC_CONFDIR=\"${sysconfdir}\" \ + -DPLUGINS=\""${aikgen_plugins}\"" diff --git a/src/aikgen/Makefile.in b/src/aikgen/Makefile.in new file mode 100644 index 000000000..77d825f26 --- /dev/null +++ b/src/aikgen/Makefile.in @@ -0,0 +1,731 @@ +# Makefile.in generated by automake 1.14.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994-2013 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; 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pdf-am ps ps-am \ + tags tags-am uninstall uninstall-am uninstall-binPROGRAMS + +aikgen.o : $(top_builddir)/config.status + +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/src/aikgen/aikgen.c b/src/aikgen/aikgen.c new file mode 100644 index 000000000..192636afc --- /dev/null +++ b/src/aikgen/aikgen.c @@ -0,0 +1,554 @@ +/* + * 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 */ +} |