- #include "gnutls-helpers.h"
- #include <gnutls/openpgp.h>
- #include <gnutls/x509.h>
- /* for htonl() */
- #include <arpa/inet.h>
- /*
- Author: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
- Date: Tue, 08 Apr 2008
- License: GPL v3 or later
- monkeysphere public key translator: execute this with an GPG
- certificate (public key(s) + userid(s)) on stdin. It currently
- only works with RSA keys.
- It will spit out a version of the first key capable of being used
- for authentication on stdout. The output format should be suitable
- for appending a known_hosts file.
- Requirements: I've only built this so far with GnuTLS v2.3.4 --
- version 2.2.0 does not contain the appropriate pieces.
- */
- int main(int argc, char* argv[]) {
- gnutls_datum_t data;
- int ret;
- gnutls_openpgp_crt_t openpgp_crt;
- gnutls_openpgp_keyid_t keyid;
- printable_keyid p_keyid;
- unsigned int keyidx;
- unsigned int usage, bits;
- gnutls_pk_algorithm_t algo;
- gnutls_datum_t m, e, p, q, g, y;
- char output_data[10240];
- size_t ods = sizeof(output_data);
- init_gnutls();
-
- init_datum(&data);
- init_datum(&m);
- init_datum(&e);
- init_datum(&p);
- init_datum(&q);
- init_datum(&g);
- init_datum(&y);
- init_keyid(keyid);
- /* slurp in the private key from stdin */
- if (ret = set_datum_fd(&data, 0), ret) {
- err("didn't read file descriptor 0\n");
- return 1;
- }
- if (ret = gnutls_openpgp_crt_init(&openpgp_crt), ret) {
- err("Failed to initialize OpenPGP certificate (error: %d)\n", ret);
- return 1;
- }
- /* format could be either: GNUTLS_OPENPGP_FMT_RAW,
- GNUTLS_OPENPGP_FMT_BASE64; if MONKEYSPHERE_RAW is set, use RAW,
- otherwise, use BASE64: */
- if (getenv("MONKEYSPHERE_RAW")) {
- err("assuming RAW formatted certificate\n");
- if (ret = gnutls_openpgp_crt_import(openpgp_crt, &data, GNUTLS_OPENPGP_FMT_RAW), ret) {
- err("failed to import the OpenPGP certificate in RAW format (error: %d)\n", ret);
- return ret;
- }
- } else {
- err("assuming BASE64 formatted certificate\n");
- if (ret = gnutls_openpgp_crt_import (openpgp_crt, &data, GNUTLS_OPENPGP_FMT_BASE64), ret) {
- err("failed to import the OpenPGP certificate in BASE64 format (error: %d)\n", ret);
- return ret;
- }
- }
- if (gnutls_openpgp_crt_get_revoked_status(openpgp_crt)) {
- err("the primary key was revoked!\n");
- return 1;
- }
- if (ret = gnutls_openpgp_crt_get_key_usage(openpgp_crt, &usage), ret) {
- err("failed to get the usage flags for the primary key (error: %d)\n", ret);
- return ret;
- }
- if (usage & GNUTLS_KEY_KEY_AGREEMENT) {
- err("the primary key can be used for authentication\n");
- algo = gnutls_openpgp_crt_get_pk_algorithm(openpgp_crt, &bits);
- if (algo < 0) {
- err("failed to get the algorithm of the OpenPGP public key (error: %d)\n", algo);
- return algo;
- } else if (algo == GNUTLS_PK_RSA) {
-
- err("OpenPGP RSA certificate, with %d bits\n", bits);
- ret = gnutls_openpgp_crt_get_pk_rsa_raw(openpgp_crt, &m, &e);
- if (GNUTLS_E_SUCCESS != ret) {
- err ("failed to export RSA key parameters (error: %d)\n", ret);
- return 1;
- }
- } else if (algo == GNUTLS_PK_DSA) {
- err("OpenPGP DSA Key, with %d bits\n", bits);
- ret = gnutls_openpgp_crt_get_pk_dsa_raw(openpgp_crt, &p, &q, &g, &y);
- if (GNUTLS_E_SUCCESS != ret) {
- err ("failed to export DSA key parameters (error: %d)\n", ret);
- return 1;
- }
- } else {
- err("OpenPGP Key was not RSA or DSA -- can't deal! (actual algorithm was: %d)\n", algo);
- return 1;
- }
-
- } else {
- err("primary key is only good for: 0x%08x. Trying subkeys...\n", usage);
-
- if (ret = gnutls_openpgp_crt_get_auth_subkey(openpgp_crt, keyid), ret) {
- err("failed to find a subkey capable of authentication (error: %d)\n", ret);
- return ret;
- }
- make_keyid_printable(p_keyid, keyid);
- err("found authentication subkey %.16s\n", p_keyid);
- ret = gnutls_openpgp_crt_get_subkey_idx(openpgp_crt, keyid);
- if (ret < 0) {
- err("could not get the index of subkey %.16s (error: %d)\n", ret);
- return ret;
- }
- keyidx = ret;
- if (gnutls_openpgp_crt_get_subkey_revoked_status(openpgp_crt, keyidx)) {
- err("The authentication subkey was revoked!\n");
- return 1;
- }
- if (ret = gnutls_openpgp_crt_get_subkey_usage(openpgp_crt, keyidx, &usage), ret) {
- err("could not figure out usage of subkey %.16s (error: %d)\n", p_keyid, ret);
- return ret;
- }
- if ((usage & GNUTLS_KEY_KEY_AGREEMENT) == 0) {
- err("could not find a subkey with authentication privileges.\n");
- return 1;
- }
- /* switch, based on the algorithm in question, to extract the MPI
- components: */
- algo = gnutls_openpgp_crt_get_subkey_pk_algorithm(openpgp_crt, keyidx, &bits);
- if (algo < 0) {
- err("failed to get the algorithm of the authentication subkey (error: %d)\n", algo);
- return algo;
- } else if (algo == GNUTLS_PK_RSA) {
-
- err("OpenPGP RSA subkey, with %d bits\n", bits);
- ret = gnutls_openpgp_crt_get_subkey_pk_rsa_raw(openpgp_crt, keyidx, &m, &e);
- if (GNUTLS_E_SUCCESS != ret) {
- err ("failed to export RSA subkey parameters (error: %d)\n", ret);
- return 1;
- }
- } else if (algo == GNUTLS_PK_DSA) {
- err("OpenPGP DSA subkey, with %d bits\n", bits);
- ret = gnutls_openpgp_crt_get_subkey_pk_dsa_raw(openpgp_crt, keyidx, &p, &q, &g, &y);
- if (GNUTLS_E_SUCCESS != ret) {
- err ("failed to export DSA subkey parameters (error: %d)\n", ret);
- return 1;
- }
- } else {
- err("OpenPGP subkey was not RSA or DSA -- can't deal! (actual algorithm was: %d)\n", algo);
- return 1;
- }
- }
- /* now we have algo, and the various MPI data set. Can we export
- them cleanly? */
-
- gnutls_openpgp_crt_deinit(openpgp_crt);
- gnutls_global_deinit();
- return 0;
- }
|