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[tor-commits] [tor/maint-0.4.1] Merge remote-tracking branch 'tor-github/pr/937' into maint-0.3.5



commit ef345ab56d26e51f5d1f1a0b51e55a589465669b
Merge: 9be65c440 85ff6f911
Author: teor <teor@xxxxxxxxxxxxxx>
Date:   Mon Aug 12 09:42:15 2019 +1000

    Merge remote-tracking branch 'tor-github/pr/937' into maint-0.3.5

 changes/bug30148               | 4 ++++
 src/feature/relay/routerkeys.c | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --cc src/feature/relay/routerkeys.c
index 876f908d4,000000000..f639fc91e
mode 100644,000000..100644
--- a/src/feature/relay/routerkeys.c
+++ b/src/feature/relay/routerkeys.c
@@@ -1,740 -1,0 +1,740 @@@
 +/* Copyright (c) 2014-2019, The Tor Project, Inc. */
 +/* See LICENSE for licensing information */
 +
 +/**
 + * \file routerkeys.c
 + *
 + * \brief Functions and structures to handle generating and maintaining the
 + *  set of keypairs necessary to be an OR.
 + *
 + * The keys handled here now are the Ed25519 keys that Tor relays use to sign
 + * descriptors, authenticate themselves on links, and identify one another
 + * uniquely.  Other keys are maintained in router.c and rendservice.c.
 + *
 + * (TODO: The keys in router.c should go here too.)
 + */
 +
 +#include "core/or/or.h"
 +#include "app/config/config.h"
 +#include "feature/relay/router.h"
 +#include "feature/relay/routerkeys.h"
 +#include "feature/relay/routermode.h"
 +#include "feature/keymgt/loadkey.h"
 +#include "feature/nodelist/torcert.h"
 +
 +#include "lib/crypt_ops/crypto_util.h"
 +#include "lib/tls/tortls.h"
 +#include "lib/tls/x509.h"
 +
 +#define ENC_KEY_HEADER "Boxed Ed25519 key"
 +#define ENC_KEY_TAG "master"
 +
 +#ifdef HAVE_UNISTD_H
 +#include <unistd.h>
 +#endif
 +
 +static ed25519_keypair_t *master_identity_key = NULL;
 +static ed25519_keypair_t *master_signing_key = NULL;
 +static ed25519_keypair_t *current_auth_key = NULL;
 +static tor_cert_t *signing_key_cert = NULL;
 +static tor_cert_t *link_cert_cert = NULL;
 +static tor_cert_t *auth_key_cert = NULL;
 +
 +static uint8_t *rsa_ed_crosscert = NULL;
 +static size_t rsa_ed_crosscert_len = 0;
 +static time_t rsa_ed_crosscert_expiration = 0;
 +
 +/**
 + * Running as a server: load, reload, or refresh our ed25519 keys and
 + * certificates, creating and saving new ones as needed.
 + *
 + * Return -1 on failure; 0 on success if the signing key was not replaced;
 + * and 1 on success if the signing key was replaced.
 + */
 +int
 +load_ed_keys(const or_options_t *options, time_t now)
 +{
 +  ed25519_keypair_t *id = NULL;
 +  ed25519_keypair_t *sign = NULL;
 +  ed25519_keypair_t *auth = NULL;
 +  const ed25519_keypair_t *sign_signing_key_with_id = NULL;
 +  const ed25519_keypair_t *use_signing = NULL;
 +  const tor_cert_t *check_signing_cert = NULL;
 +  tor_cert_t *sign_cert = NULL;
 +  tor_cert_t *auth_cert = NULL;
 +  int signing_key_changed = 0;
 +
 +  // It is later than 1972, since otherwise there would be no C compilers.
 +  // (Try to diagnose #22466.)
 +  tor_assert_nonfatal(now >= 2 * 365 * 86400);
 +
 +#define FAIL(msg) do {                          \
 +    log_warn(LD_OR, (msg));                     \
 +    goto err;                                   \
 +  } while (0)
 +#define SET_KEY(key, newval) do {               \
 +    if ((key) != (newval))                      \
 +      ed25519_keypair_free(key);                \
 +    key = (newval);                             \
 +  } while (0)
 +#define SET_CERT(cert, newval) do {             \
 +    if ((cert) != (newval))                     \
 +      tor_cert_free(cert);                      \
 +    cert = (newval);                            \
 +  } while (0)
 +#define HAPPENS_SOON(when, interval)            \
 +  ((when) < now + (interval))
 +#define EXPIRES_SOON(cert, interval)            \
 +  (!(cert) || HAPPENS_SOON((cert)->valid_until, (interval)))
 +
 +  /* XXXX support encrypted identity keys fully */
 +
 +  /* First try to get the signing key to see how it is. */
 +  {
 +    char *fname =
 +      options_get_keydir_fname(options, "ed25519_signing");
 +    sign = ed_key_init_from_file(
 +               fname,
 +               INIT_ED_KEY_NEEDCERT|
 +               INIT_ED_KEY_INCLUDE_SIGNING_KEY_IN_CERT,
 +               LOG_INFO,
 +               NULL, 0, 0, CERT_TYPE_ID_SIGNING, &sign_cert, options);
 +    tor_free(fname);
 +    check_signing_cert = sign_cert;
 +    use_signing = sign;
 +  }
 +
 +  if (use_signing) {
 +    /* We loaded a signing key with its certificate.  */
 +    if (! master_signing_key) {
 +      /* We didn't know one before! */
 +      signing_key_changed = 1;
 +    } else if (! ed25519_pubkey_eq(&use_signing->pubkey,
 +                                   &master_signing_key->pubkey) ||
 +               ! tor_memeq(use_signing->seckey.seckey,
 +                           master_signing_key->seckey.seckey,
 +                           ED25519_SECKEY_LEN)) {
 +      /* We loaded a different signing key than the one we knew before. */
 +      signing_key_changed = 1;
 +    }
 +  }
 +
 +  if (!use_signing && master_signing_key) {
 +    /* We couldn't load a signing key, but we already had one loaded */
 +    check_signing_cert = signing_key_cert;
 +    use_signing = master_signing_key;
 +  }
 +
 +  const int offline_master =
 +    options->OfflineMasterKey && options->command != CMD_KEYGEN;
 +  const int need_new_signing_key =
 +    NULL == use_signing ||
 +    EXPIRES_SOON(check_signing_cert, 0) ||
 +    (options->command == CMD_KEYGEN && ! options->change_key_passphrase);
 +  const int want_new_signing_key =
 +    need_new_signing_key ||
 +    EXPIRES_SOON(check_signing_cert, options->TestingSigningKeySlop);
 +
 +  /* We can only create a master key if we haven't been told that the
 +   * master key will always be offline.  Also, if we have a signing key,
 +   * then we shouldn't make a new master ID key. */
 +  const int can_make_master_id_key = !offline_master &&
 +    NULL == use_signing;
 +
 +  if (need_new_signing_key) {
 +    log_notice(LD_OR, "It looks like I need to generate and sign a new "
 +               "medium-term signing key, because %s. To do that, I "
 +               "need to load%s the permanent master identity key. "
 +               "If the master identity key was not moved or encrypted "
 +               "with a passphrase, this will be done automatically and "
 +               "no further action is required. Otherwise, provide the "
 +               "necessary data using 'tor --keygen' to do it manually.",
 +            (NULL == use_signing) ? "I don't have one" :
 +            EXPIRES_SOON(check_signing_cert, 0) ? "the one I have is expired" :
 +               "you asked me to make one with --keygen",
 +            can_make_master_id_key ? " (or create)" : "");
 +  } else if (want_new_signing_key && !offline_master) {
 +    log_notice(LD_OR, "It looks like I should try to generate and sign a "
 +               "new medium-term signing key, because the one I have is "
 +               "going to expire soon. To do that, I'm going to have to "
 +               "try to load the permanent master identity key. "
 +               "If the master identity key was not moved or encrypted "
 +               "with a passphrase, this will be done automatically and "
 +               "no further action is required. Otherwise, provide the "
 +               "necessary data using 'tor --keygen' to do it manually.");
 +  } else if (want_new_signing_key) {
 +    log_notice(LD_OR, "It looks like I should try to generate and sign a "
 +               "new medium-term signing key, because the one I have is "
 +               "going to expire soon. But OfflineMasterKey is set, so I "
 +               "won't try to load a permanent master identity key. You "
 +               "will need to use 'tor --keygen' to make a new signing "
 +               "key and certificate.");
 +  }
 +
 +  {
 +    uint32_t flags =
 +      (INIT_ED_KEY_SPLIT|
 +       INIT_ED_KEY_EXTRA_STRONG|INIT_ED_KEY_NO_REPAIR);
 +    if (can_make_master_id_key)
 +      flags |= INIT_ED_KEY_CREATE;
 +    if (! need_new_signing_key)
 +      flags |= INIT_ED_KEY_MISSING_SECRET_OK;
 +    if (! want_new_signing_key || offline_master)
 +      flags |= INIT_ED_KEY_OMIT_SECRET;
 +    if (offline_master)
 +      flags |= INIT_ED_KEY_OFFLINE_SECRET;
 +    if (options->command == CMD_KEYGEN)
 +      flags |= INIT_ED_KEY_TRY_ENCRYPTED;
 +
 +    /* Check/Create the key directory */
 +    if (create_keys_directory(options) < 0)
-       return -1;
++      goto err;
 +
 +    char *fname;
 +    if (options->master_key_fname) {
 +      fname = tor_strdup(options->master_key_fname);
 +      flags |= INIT_ED_KEY_EXPLICIT_FNAME;
 +    } else {
 +      fname = options_get_keydir_fname(options, "ed25519_master_id");
 +    }
 +    id = ed_key_init_from_file(
 +             fname,
 +             flags,
 +             LOG_WARN, NULL, 0, 0, 0, NULL, options);
 +    tor_free(fname);
 +    if (!id) {
 +      if (need_new_signing_key) {
 +        if (offline_master)
 +          FAIL("Can't load master identity key; OfflineMasterKey is set.");
 +        else
 +          FAIL("Missing identity key");
 +      } else {
 +        log_warn(LD_OR, "Master public key was absent; inferring from "
 +                 "public key in signing certificate and saving to disk.");
 +        tor_assert(check_signing_cert);
 +        id = tor_malloc_zero(sizeof(*id));
 +        memcpy(&id->pubkey, &check_signing_cert->signing_key,
 +               sizeof(ed25519_public_key_t));
 +        fname = options_get_keydir_fname(options,
 +                                         "ed25519_master_id_public_key");
 +        if (ed25519_pubkey_write_to_file(&id->pubkey, fname, "type0") < 0) {
 +          log_warn(LD_OR, "Error while attempting to write master public key "
 +                   "to disk");
 +          tor_free(fname);
 +          goto err;
 +        }
 +        tor_free(fname);
 +      }
 +    }
 +    if (tor_mem_is_zero((char*)id->seckey.seckey, sizeof(id->seckey)))
 +      sign_signing_key_with_id = NULL;
 +    else
 +      sign_signing_key_with_id = id;
 +  }
 +
 +  if (master_identity_key &&
 +      !ed25519_pubkey_eq(&id->pubkey, &master_identity_key->pubkey)) {
 +    FAIL("Identity key on disk does not match key we loaded earlier!");
 +  }
 +
 +  if (need_new_signing_key && NULL == sign_signing_key_with_id)
 +    FAIL("Can't load master key make a new signing key.");
 +
 +  if (sign_cert) {
 +    if (! sign_cert->signing_key_included)
 +      FAIL("Loaded a signing cert with no key included!");
 +    if (! ed25519_pubkey_eq(&sign_cert->signing_key, &id->pubkey))
 +      FAIL("The signing cert we have was not signed with the master key "
 +           "we loaded!");
 +    if (tor_cert_checksig(sign_cert, &id->pubkey, 0) < 0) {
 +      log_warn(LD_OR, "The signing cert we loaded was not signed "
 +               "correctly: %s!",
 +               tor_cert_describe_signature_status(sign_cert));
 +      goto err;
 +    }
 +  }
 +
 +  if (want_new_signing_key && sign_signing_key_with_id) {
 +    uint32_t flags = (INIT_ED_KEY_CREATE|
 +                      INIT_ED_KEY_REPLACE|
 +                      INIT_ED_KEY_EXTRA_STRONG|
 +                      INIT_ED_KEY_NEEDCERT|
 +                      INIT_ED_KEY_INCLUDE_SIGNING_KEY_IN_CERT);
 +    char *fname =
 +      options_get_keydir_fname(options, "ed25519_signing");
 +    ed25519_keypair_free(sign);
 +    tor_cert_free(sign_cert);
 +    sign = ed_key_init_from_file(fname,
 +                                 flags, LOG_WARN,
 +                                 sign_signing_key_with_id, now,
 +                                 options->SigningKeyLifetime,
 +                                 CERT_TYPE_ID_SIGNING, &sign_cert, options);
 +    tor_free(fname);
 +    if (!sign)
 +      FAIL("Missing signing key");
 +    use_signing = sign;
 +    signing_key_changed = 1;
 +
 +    tor_assert(sign_cert->signing_key_included);
 +    tor_assert(ed25519_pubkey_eq(&sign_cert->signing_key, &id->pubkey));
 +    tor_assert(ed25519_pubkey_eq(&sign_cert->signed_key, &sign->pubkey));
 +  } else if (want_new_signing_key) {
 +    static ratelim_t missing_master = RATELIM_INIT(3600);
 +    log_fn_ratelim(&missing_master, LOG_WARN, LD_OR,
 +                   "Signing key will expire soon, but I can't load the "
 +                   "master key to sign a new one!");
 +  }
 +
 +  tor_assert(use_signing);
 +
 +  /* At this point we no longer need our secret identity key.  So wipe
 +   * it, if we loaded it in the first place. */
 +  memwipe(id->seckey.seckey, 0, sizeof(id->seckey));
 +
 +  if (options->command == CMD_KEYGEN)
 +    goto end;
 +
 +  if (server_mode(options) &&
 +      (!rsa_ed_crosscert ||
 +       HAPPENS_SOON(rsa_ed_crosscert_expiration, 30*86400))) {
 +    uint8_t *crosscert;
 +    time_t expiration = now+6*30*86400; /* 6 months in the future. */
 +    ssize_t crosscert_len = tor_make_rsa_ed25519_crosscert(&id->pubkey,
 +                                                   get_server_identity_key(),
 +                                                   expiration,
 +                                                   &crosscert);
 +    tor_free(rsa_ed_crosscert);
 +    rsa_ed_crosscert_len = crosscert_len;
 +    rsa_ed_crosscert = crosscert;
 +    rsa_ed_crosscert_expiration = expiration;
 +  }
 +
 +  if (!current_auth_key ||
 +      signing_key_changed ||
 +      EXPIRES_SOON(auth_key_cert, options->TestingAuthKeySlop)) {
 +    auth = ed_key_new(use_signing, INIT_ED_KEY_NEEDCERT,
 +                      now,
 +                      options->TestingAuthKeyLifetime,
 +                      CERT_TYPE_SIGNING_AUTH, &auth_cert);
 +
 +    if (!auth)
 +      FAIL("Can't create auth key");
 +  }
 +
 +  /* We've generated or loaded everything.  Put them in memory. */
 +
 + end:
 +  if (! master_identity_key) {
 +    SET_KEY(master_identity_key, id);
 +  } else {
 +    tor_free(id);
 +  }
 +  if (sign) {
 +    SET_KEY(master_signing_key, sign);
 +    SET_CERT(signing_key_cert, sign_cert);
 +  }
 +  if (auth) {
 +    SET_KEY(current_auth_key, auth);
 +    SET_CERT(auth_key_cert, auth_cert);
 +  }
 +
 +  return signing_key_changed;
 + err:
 +  ed25519_keypair_free(id);
 +  ed25519_keypair_free(sign);
 +  ed25519_keypair_free(auth);
 +  tor_cert_free(sign_cert);
 +  tor_cert_free(auth_cert);
 +  return -1;
 +}
 +
 +/**
 + * Retrieve our currently-in-use Ed25519 link certificate and id certificate,
 + * and, if they would expire soon (based on the time <b>now</b>, generate new
 + * certificates (without embedding the public part of the signing key inside).
 + * If <b>force</b> is true, always generate a new certificate.
 + *
 + * The signed_key from the current id->signing certificate will be used to
 + * sign the new key within newly generated X509 certificate.
 + *
 + * Returns -1 upon error.  Otherwise, returns 0 upon success (either when the
 + * current certificate is still valid, or when a new certificate was
 + * successfully generated, or no certificate was needed).
 + */
 +int
 +generate_ed_link_cert(const or_options_t *options, time_t now,
 +                      int force)
 +{
 +  const tor_x509_cert_t *link_ = NULL, *id = NULL;
 +  tor_cert_t *link_cert = NULL;
 +
 +  if (tor_tls_get_my_certs(1, &link_, &id) < 0 || link_ == NULL) {
 +    if (!server_mode(options)) {
 +        /* No need to make an Ed25519->Link cert: we are a client */
 +      return 0;
 +    }
 +    log_warn(LD_OR, "Can't get my x509 link cert.");
 +    return -1;
 +  }
 +
 +  const common_digests_t *digests = tor_x509_cert_get_cert_digests(link_);
 +
 +  if (force == 0 &&
 +      link_cert_cert &&
 +      ! EXPIRES_SOON(link_cert_cert, options->TestingLinkKeySlop) &&
 +      fast_memeq(digests->d[DIGEST_SHA256], link_cert_cert->signed_key.pubkey,
 +                 DIGEST256_LEN)) {
 +    return 0;
 +  }
 +
 +  ed25519_public_key_t dummy_key;
 +  memcpy(dummy_key.pubkey, digests->d[DIGEST_SHA256], DIGEST256_LEN);
 +
 +  link_cert = tor_cert_create(get_master_signing_keypair(),
 +                              CERT_TYPE_SIGNING_LINK,
 +                              &dummy_key,
 +                              now,
 +                              options->TestingLinkCertLifetime, 0);
 +
 +  if (link_cert) {
 +    SET_CERT(link_cert_cert, link_cert);
 +  }
 +  return 0;
 +}
 +
 +#undef FAIL
 +#undef SET_KEY
 +#undef SET_CERT
 +
 +/**
 + * Return 1 if any of the following are true:
 + *
 + *   - if one of our Ed25519 signing, auth, or link certificates would expire
 + *     soon w.r.t. the time <b>now</b>,
 + *   - if we do not currently have a link certificate, or
 + *   - if our cached Ed25519 link certificate is not same as the one we're
 + *     currently using.
 + *
 + * Otherwise, returns 0.
 + */
 +int
 +should_make_new_ed_keys(const or_options_t *options, const time_t now)
 +{
 +  if (!master_identity_key ||
 +      !master_signing_key ||
 +      !current_auth_key ||
 +      !link_cert_cert ||
 +      EXPIRES_SOON(signing_key_cert, options->TestingSigningKeySlop) ||
 +      EXPIRES_SOON(auth_key_cert, options->TestingAuthKeySlop) ||
 +      EXPIRES_SOON(link_cert_cert, options->TestingLinkKeySlop))
 +    return 1;
 +
 +  const tor_x509_cert_t *link_ = NULL, *id = NULL;
 +
 +  if (tor_tls_get_my_certs(1, &link_, &id) < 0 || link_ == NULL)
 +    return 1;
 +
 +  const common_digests_t *digests = tor_x509_cert_get_cert_digests(link_);
 +
 +  if (!fast_memeq(digests->d[DIGEST_SHA256],
 +                  link_cert_cert->signed_key.pubkey,
 +                  DIGEST256_LEN)) {
 +    return 1;
 +  }
 +
 +  return 0;
 +}
 +
 +#undef EXPIRES_SOON
 +#undef HAPPENS_SOON
 +
 +#ifdef TOR_UNIT_TESTS
 +/* Helper for unit tests: populate the ed25519 keys without saving or
 + * loading */
 +void
 +init_mock_ed_keys(const crypto_pk_t *rsa_identity_key)
 +{
 +  routerkeys_free_all();
 +
 +#define MAKEKEY(k)                                      \
 +  k = tor_malloc_zero(sizeof(*k));                      \
 +  if (ed25519_keypair_generate(k, 0) < 0) {             \
 +    log_warn(LD_BUG, "Couldn't make a keypair");        \
 +    goto err;                                           \
 +  }
 +  MAKEKEY(master_identity_key);
 +  MAKEKEY(master_signing_key);
 +  MAKEKEY(current_auth_key);
 +#define MAKECERT(cert, signing, signed_, type, flags)            \
 +  cert = tor_cert_create(signing,                                \
 +                         type,                                   \
 +                         &signed_->pubkey,                       \
 +                         time(NULL), 86400,                      \
 +                         flags);                                 \
 +  if (!cert) {                                                   \
 +    log_warn(LD_BUG, "Couldn't make a %s certificate!", #cert);  \
 +    goto err;                                                    \
 +  }
 +
 +  MAKECERT(signing_key_cert,
 +           master_identity_key, master_signing_key, CERT_TYPE_ID_SIGNING,
 +           CERT_FLAG_INCLUDE_SIGNING_KEY);
 +  MAKECERT(auth_key_cert,
 +           master_signing_key, current_auth_key, CERT_TYPE_SIGNING_AUTH, 0);
 +
 +  if (generate_ed_link_cert(get_options(), time(NULL), 0) < 0) {
 +    log_warn(LD_BUG, "Couldn't make link certificate");
 +    goto err;
 +  }
 +
 +  rsa_ed_crosscert_len = tor_make_rsa_ed25519_crosscert(
 +                                     &master_identity_key->pubkey,
 +                                     rsa_identity_key,
 +                                     time(NULL)+86400,
 +                                     &rsa_ed_crosscert);
 +
 +  return;
 +
 + err:
 +  routerkeys_free_all();
 +  tor_assert_nonfatal_unreached();
 +}
 +#undef MAKEKEY
 +#undef MAKECERT
 +#endif /* defined(TOR_UNIT_TESTS) */
 +
 +/**
 + * Print the ISO8601-formated <b>expiration</b> for a certificate with
 + * some <b>description</b> to stdout.
 + *
 + * For example, for a signing certificate, this might print out:
 + * signing-cert-expiry: 2017-07-25 08:30:15 UTC
 + */
 +static void
 +print_cert_expiration(const char *expiration,
 +                      const char *description)
 +{
 +  fprintf(stderr, "%s-cert-expiry: %s\n", description, expiration);
 +}
 +
 +/**
 + * Log when a certificate, <b>cert</b>, with some <b>description</b> and
 + * stored in a file named <b>fname</b>, is going to expire.
 + */
 +static void
 +log_ed_cert_expiration(const tor_cert_t *cert,
 +                       const char *description,
 +                       const char *fname) {
 +  char expiration[ISO_TIME_LEN+1];
 +
 +  if (BUG(!cert)) { /* If the specified key hasn't been loaded */
 +    log_warn(LD_OR, "No %s key loaded; can't get certificate expiration.",
 +             description);
 +  } else {
 +    format_local_iso_time(expiration, cert->valid_until);
 +    log_notice(LD_OR, "The %s certificate stored in %s is valid until %s.",
 +               description, fname, expiration);
 +    print_cert_expiration(expiration, description);
 +  }
 +}
 +
 +/**
 + * Log when our master signing key certificate expires.  Used when tor is given
 + * the --key-expiration command-line option.
 + *
 + * Returns 0 on success and 1 on failure.
 + */
 +static int
 +log_master_signing_key_cert_expiration(const or_options_t *options)
 +{
 +  const tor_cert_t *signing_key;
 +  char *fn = NULL;
 +  int failed = 0;
 +  time_t now = approx_time();
 +
 +  fn = options_get_keydir_fname(options, "ed25519_signing_cert");
 +
 +  /* Try to grab our cached copy of the key. */
 +  signing_key = get_master_signing_key_cert();
 +
 +  tor_assert(server_identity_key_is_set());
 +
 +  /* Load our keys from disk, if necessary. */
 +  if (!signing_key) {
 +    failed = load_ed_keys(options, now) < 0;
 +    signing_key = get_master_signing_key_cert();
 +  }
 +
 +  /* If we do have a signing key, log the expiration time. */
 +  if (signing_key) {
 +    log_ed_cert_expiration(signing_key, "signing", fn);
 +  } else {
 +    log_warn(LD_OR, "Could not load signing key certificate from %s, so " \
 +             "we couldn't learn anything about certificate expiration.", fn);
 +  }
 +
 +  tor_free(fn);
 +
 +  return failed;
 +}
 +
 +/**
 + * Log when a key certificate expires.  Used when tor is given the
 + * --key-expiration command-line option.
 + *
 + * If an command argument is given, which should specify the type of
 + * key to get expiry information about (currently supported arguments
 + * are "sign"), get info about that type of certificate.  Otherwise,
 + * print info about the supported arguments.
 + *
 + * Returns 0 on success and -1 on failure.
 + */
 +int
 +log_cert_expiration(void)
 +{
 +  const or_options_t *options = get_options();
 +  const char *arg = options->command_arg;
 +
 +  if (!strcmp(arg, "sign")) {
 +    return log_master_signing_key_cert_expiration(options);
 +  } else {
 +    fprintf(stderr, "No valid argument to --key-expiration found!\n");
 +    fprintf(stderr, "Currently recognised arguments are: 'sign'\n");
 +
 +    return -1;
 +  }
 +}
 +
 +const ed25519_public_key_t *
 +get_master_identity_key(void)
 +{
 +  if (!master_identity_key)
 +    return NULL;
 +  return &master_identity_key->pubkey;
 +}
 +
 +/** Return true iff <b>id</b> is our Ed25519 master identity key. */
 +int
 +router_ed25519_id_is_me(const ed25519_public_key_t *id)
 +{
 +  return id && master_identity_key &&
 +    ed25519_pubkey_eq(id, &master_identity_key->pubkey);
 +}
 +
 +#ifdef TOR_UNIT_TESTS
 +/* only exists for the unit tests, since otherwise the identity key
 + * should be used to sign nothing but the signing key. */
 +const ed25519_keypair_t *
 +get_master_identity_keypair(void)
 +{
 +  return master_identity_key;
 +}
 +#endif /* defined(TOR_UNIT_TESTS) */
 +
 +const ed25519_keypair_t *
 +get_master_signing_keypair(void)
 +{
 +  return master_signing_key;
 +}
 +
 +const struct tor_cert_st *
 +get_master_signing_key_cert(void)
 +{
 +  return signing_key_cert;
 +}
 +
 +const ed25519_keypair_t *
 +get_current_auth_keypair(void)
 +{
 +  return current_auth_key;
 +}
 +
 +const tor_cert_t *
 +get_current_link_cert_cert(void)
 +{
 +  return link_cert_cert;
 +}
 +
 +const tor_cert_t *
 +get_current_auth_key_cert(void)
 +{
 +  return auth_key_cert;
 +}
 +
 +void
 +get_master_rsa_crosscert(const uint8_t **cert_out,
 +                         size_t *size_out)
 +{
 +  *cert_out = rsa_ed_crosscert;
 +  *size_out = rsa_ed_crosscert_len;
 +}
 +
 +/** Construct cross-certification for the master identity key with
 + * the ntor onion key. Store the sign of the corresponding ed25519 public key
 + * in *<b>sign_out</b>. */
 +tor_cert_t *
 +make_ntor_onion_key_crosscert(const curve25519_keypair_t *onion_key,
 +      const ed25519_public_key_t *master_id_key, time_t now, time_t lifetime,
 +      int *sign_out)
 +{
 +  tor_cert_t *cert = NULL;
 +  ed25519_keypair_t ed_onion_key;
 +
 +  if (ed25519_keypair_from_curve25519_keypair(&ed_onion_key, sign_out,
 +                                              onion_key) < 0)
 +    goto end;
 +
 +  cert = tor_cert_create(&ed_onion_key, CERT_TYPE_ONION_ID, master_id_key,
 +      now, lifetime, 0);
 +
 + end:
 +  memwipe(&ed_onion_key, 0, sizeof(ed_onion_key));
 +  return cert;
 +}
 +
 +/** Construct and return an RSA signature for the TAP onion key to
 + * cross-certify the RSA and Ed25519 identity keys. Set <b>len_out</b> to its
 + * length. */
 +uint8_t *
 +make_tap_onion_key_crosscert(const crypto_pk_t *onion_key,
 +                             const ed25519_public_key_t *master_id_key,
 +                             const crypto_pk_t *rsa_id_key,
 +                             int *len_out)
 +{
 +  uint8_t signature[PK_BYTES];
 +  uint8_t signed_data[DIGEST_LEN + ED25519_PUBKEY_LEN];
 +
 +  *len_out = 0;
 +  if (crypto_pk_get_digest(rsa_id_key, (char*)signed_data) < 0) {
 +    return NULL;
 +  }
 +  memcpy(signed_data + DIGEST_LEN, master_id_key->pubkey, ED25519_PUBKEY_LEN);
 +
 +  int r = crypto_pk_private_sign(onion_key,
 +                               (char*)signature, sizeof(signature),
 +                               (const char*)signed_data, sizeof(signed_data));
 +  if (r < 0)
 +    return NULL;
 +
 +  *len_out = r;
 +
 +  return tor_memdup(signature, r);
 +}
 +
 +void
 +routerkeys_free_all(void)
 +{
 +  ed25519_keypair_free(master_identity_key);
 +  ed25519_keypair_free(master_signing_key);
 +  ed25519_keypair_free(current_auth_key);
 +  tor_cert_free(signing_key_cert);
 +  tor_cert_free(link_cert_cert);
 +  tor_cert_free(auth_key_cert);
 +  tor_free(rsa_ed_crosscert);
 +
 +  master_identity_key = master_signing_key = NULL;
 +  current_auth_key = NULL;
 +  signing_key_cert = link_cert_cert = auth_key_cert = NULL;
 +  rsa_ed_crosscert = NULL; // redundant
 +  rsa_ed_crosscert_len = 0;
 +}



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