diff options
Diffstat (limited to 'src/or/routerkeys.c')
| -rw-r--r-- | src/or/routerkeys.c | 135 |
1 files changed, 125 insertions, 10 deletions
diff --git a/src/or/routerkeys.c b/src/or/routerkeys.c index ca32228fc7..51802b15e5 100644 --- a/src/or/routerkeys.c +++ b/src/or/routerkeys.c @@ -5,8 +5,13 @@ * \file routerkeys.c * * \brief Functions and structures to handle generating and maintaining the - * set of keypairs necessary to be an OR. (Some of the code in router.c - * belongs here.) + * 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 "or.h" @@ -19,6 +24,7 @@ #define ENC_KEY_HEADER "Boxed Ed25519 key" #define ENC_KEY_TAG "master" +/* DOCDOC */ static ssize_t do_getpass(const char *prompt, char *buf, size_t buflen, int twice, const or_options_t *options) @@ -85,6 +91,7 @@ do_getpass(const char *prompt, char *buf, size_t buflen, return length; } +/* DOCDOC */ int read_encrypted_secret_key(ed25519_secret_key_t *out, const char *fname) @@ -157,6 +164,7 @@ read_encrypted_secret_key(ed25519_secret_key_t *out, return r; } +/* DOCDOC */ int write_encrypted_secret_key(const ed25519_secret_key_t *key, const char *fname) @@ -200,6 +208,7 @@ write_encrypted_secret_key(const ed25519_secret_key_t *key, return r; } +/* DOCDOC */ static int write_secret_key(const ed25519_secret_key_t *key, int encrypted, const char *fname, @@ -733,8 +742,12 @@ load_ed_keys(const or_options_t *options, time_t now) 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.", + "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", @@ -742,15 +755,19 @@ load_ed_keys(const or_options_t *options, time_t now) } 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."); + "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 is set. " - "You will need to use 'tor --keygen' make a new signing key " - "and certificate."); + "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."); } { @@ -927,7 +944,18 @@ load_ed_keys(const or_options_t *options, time_t now) return -1; } -/* DOCDOC */ +/** + * 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). + * + * The signed_key from the expiring 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). + */ int generate_ed_link_cert(const or_options_t *options, time_t now) { @@ -967,6 +995,17 @@ generate_ed_link_cert(const or_options_t *options, time_t now) #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) { @@ -997,6 +1036,61 @@ should_make_new_ed_keys(const or_options_t *options, const time_t now) #undef EXPIRES_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) { + 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 + const ed25519_public_key_t * get_master_identity_key(void) { @@ -1005,6 +1099,24 @@ get_master_identity_key(void) 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 + const ed25519_keypair_t * get_master_signing_keypair(void) { @@ -1139,9 +1251,12 @@ routerkeys_free_all(void) 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; } |