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Maintain separate server and client identity keys when appropriate. 

Fixes a bug described in ticket #988.
This commit is contained in:
Robert Ransom 2010-10-03 22:38:53 -07:00
parent 17efbe031d
commit a2bb0bfdd5
6 changed files with 102 additions and 45 deletions
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5
src/or/connection_or.c
View File

@ -1007,6 +1007,9 @@ connection_or_check_valid_tls_handshake(or_connection_t *conn,
started_here ? conn->_base.address :
safe_str_client(conn->_base.address);
const char *conn_type = started_here ? "outgoing" : "incoming";
crypto_pk_env_t *our_identity =
started_here ? get_client_identity_key() :
get_server_identity_key();
int has_cert = 0, has_identity=0;
check_no_tls_errors();
@ -1044,7 +1047,7 @@ connection_or_check_valid_tls_handshake(or_connection_t *conn,
if (identity_rcvd) {
has_identity = 1;
crypto_pk_get_digest(identity_rcvd, digest_rcvd_out);
if (crypto_pk_cmp_keys(get_identity_key(), identity_rcvd)<0) {
if (crypto_pk_cmp_keys(our_identity, identity_rcvd)<0) {
conn->circ_id_type = CIRC_ID_TYPE_LOWER;
} else {
conn->circ_id_type = CIRC_ID_TYPE_HIGHER;

7
src/or/dirserv.c
View File

@ -1552,7 +1552,8 @@ dirserv_regenerate_directory(void)
{
char *new_directory=NULL;
if (dirserv_dump_directory_to_string(&new_directory, get_identity_key())) {
if (dirserv_dump_directory_to_string(&new_directory,
get_server_identity_key())) {
log_warn(LD_BUG, "Error creating directory.");
tor_free(new_directory);
return NULL;
@ -1582,7 +1583,7 @@ generate_runningrouters(void)
char digest[DIGEST_LEN];
char published[ISO_TIME_LEN+1];
size_t len;
crypto_pk_env_t *private_key = get_identity_key();
crypto_pk_env_t *private_key = get_server_identity_key();
char *identity_pkey; /* Identity key, DER64-encoded. */
size_t identity_pkey_len;
@ -2710,7 +2711,7 @@ generate_v2_networkstatus_opinion(void)
smartlist_t *routers = NULL;
digestmap_t *omit_as_sybil = NULL;
private_key = get_identity_key();
private_key = get_server_identity_key();
if (resolve_my_address(LOG_WARN, options, &addr, &hostname)<0) {
log_warn(LD_NET, "Couldn't resolve my hostname");

4
src/or/hibernate.c
View File

@ -522,7 +522,7 @@ accounting_set_wakeup_time(void)
uint64_t time_to_exhaust_bw;
int time_to_consider;
if (! identity_key_is_set()) {
if (! server_identity_key_is_set()) {
if (init_keys() < 0) {
log_err(LD_BUG, "Error initializing keys");
tor_assert(0);
@ -530,7 +530,7 @@ accounting_set_wakeup_time(void)
}
format_iso_time(buf, interval_start_time);
crypto_pk_get_digest(get_identity_key(), digest);
crypto_pk_get_digest(get_server_identity_key(), digest);
d_env = crypto_new_digest_env();
crypto_digest_add_bytes(d_env, buf, ISO_TIME_LEN);

8
src/or/main.c
View File

@ -932,8 +932,8 @@ run_scheduled_events(time_t now)
if (last_rotated_x509_certificate+MAX_SSL_KEY_LIFETIME < now) {
log_info(LD_GENERAL,"Rotating tls context.");
if (tor_tls_context_init(public_server_mode(options),
get_identity_key(),
is_server ? get_identity_key() : NULL,
get_client_identity_key(),
is_server ? get_server_identity_key() : NULL,
MAX_SSL_KEY_LIFETIME) < 0) {
log_warn(LD_BUG, "Error reinitializing TLS context");
/* XXX is it a bug here, that we just keep going? -RD */
@ -1466,7 +1466,7 @@ do_main_loop(void)
/* load the private keys, if we're supposed to have them, and set up the
* TLS context. */
if (! identity_key_is_set()) {
if (! client_identity_key_is_set()) {
if (init_keys() < 0) {
log_err(LD_BUG,"Error initializing keys; exiting");
return -1;
@ -2102,7 +2102,7 @@ do_list_fingerprint(void)
log_err(LD_BUG,"Error initializing keys; can't display fingerprint");
return -1;
}
if (!(k = get_identity_key())) {
if (!(k = get_server_identity_key())) {
log_err(LD_GENERAL,"Error: missing identity key.");
return -1;
}

114
src/or/router.c
View File

@ -49,11 +49,15 @@ static crypto_pk_env_t *onionkey=NULL;
/** Previous private onionskin decryption key: used to decode CREATE cells
* generated by clients that have an older version of our descriptor. */
static crypto_pk_env_t *lastonionkey=NULL;
/** Private "identity key": used to sign directory info and TLS
/** Private server "identity key": used to sign directory info and TLS
* certificates. Never changes. */
static crypto_pk_env_t *identitykey=NULL;
/** Digest of identitykey. */
static char identitykey_digest[DIGEST_LEN];
static crypto_pk_env_t *server_identitykey=NULL;
/** Digest of server_identitykey. */
static char server_identitykey_digest[DIGEST_LEN];
/** Private client "identity key": used to sign bridges' and clients'
* outbound TLS certificates. Regenerated on startup and on IP address
* change. */
static crypto_pk_env_t *client_identitykey=NULL;
/** Signing key used for v3 directory material; only set for authorities. */
static crypto_pk_env_t *authority_signing_key = NULL;
/** Key certificate to authenticate v3 directory material; only set for
@ -123,31 +127,57 @@ get_onion_key_set_at(void)
return onionkey_set_at;
}
/** Set the current identity key to k.
/** Set the current server identity key to <b>k</b>.
*/
void
set_identity_key(crypto_pk_env_t *k)
set_server_identity_key(crypto_pk_env_t *k)
{
crypto_free_pk_env(identitykey);
identitykey = k;
crypto_pk_get_digest(identitykey, identitykey_digest);
crypto_free_pk_env(server_identitykey);
server_identitykey = k;
crypto_pk_get_digest(server_identitykey, server_identitykey_digest);
}
/** Returns the current identity key; requires that the identity key has been
* set.
/** Returns the current server identity key; requires that the key has
* been set.
*/
crypto_pk_env_t *
get_identity_key(void)
get_server_identity_key(void)
{
tor_assert(identitykey);
return identitykey;
tor_assert(server_identitykey);
return server_identitykey;
}
/** Return true iff the identity key has been set. */
/** Return true iff the server identity key has been set. */
int
identity_key_is_set(void)
server_identity_key_is_set(void)
{
return identitykey != NULL;
return server_identitykey != NULL;
}
/** Set the current client identity key to <b>k</b>.
*/
void
set_client_identity_key(crypto_pk_env_t *k)
{
crypto_free_pk_env(client_identitykey);
client_identitykey = k;
}
/** Returns the current client identity key; requires that the key has
* been set.
*/
crypto_pk_env_t *
get_client_identity_key(void)
{
tor_assert(client_identitykey);
return client_identitykey;
}
/** Return true iff the client identity key has been set. */
int
client_identity_key_is_set(void)
{
return client_identitykey != NULL;
}
/** Return the key certificate for this v3 (voting) authority, or NULL
@ -470,10 +500,10 @@ init_keys(void)
crypto_free_pk_env(prkey);
return -1;
}
set_identity_key(prkey);
set_client_identity_key(prkey);
/* Create a TLS context. */
if (tor_tls_context_init(0,
get_identity_key(),
get_client_identity_key(),
NULL,
MAX_SSL_KEY_LIFETIME) < 0) {
log_err(LD_GENERAL,"Error creating TLS context for Tor client.");
@ -510,13 +540,28 @@ init_keys(void)
}
}
/* 1. Read identity key. Make it if none is found. */
/* 1b. Read identity key. Make it if none is found. */
keydir = get_datadir_fname2("keys", "secret_id_key");
log_info(LD_GENERAL,"Reading/making identity key \"%s\"...",keydir);
prkey = init_key_from_file(keydir, 1, LOG_ERR);
tor_free(keydir);
if (!prkey) return -1;
set_identity_key(prkey);
set_server_identity_key(prkey);
/* 1c. If we are configured as a bridge, generate a client key;
* otherwise, set the server identity key as our client identity
* key. */
if (public_server_mode(options)) {
set_client_identity_key(prkey); /* set above */
} else {
if (!(prkey = crypto_new_pk_env()))
return -1;
if (crypto_pk_generate_key(prkey)) {
crypto_free_pk_env(prkey);
return -1;
}
set_client_identity_key(prkey);
}
/* 2. Read onion key. Make it if none is found. */
keydir = get_datadir_fname2("keys", "secret_onion_key");
@ -554,8 +599,8 @@ init_keys(void)
/* 3. Initialize link key and TLS context. */
if (tor_tls_context_init(public_server_mode(options),
get_identity_key(),
get_identity_key(),
get_client_identity_key(),
get_server_identity_key(),
MAX_SSL_KEY_LIFETIME) < 0) {
log_err(LD_GENERAL,"Error initializing TLS context");
return -1;
@ -567,7 +612,8 @@ init_keys(void)
const char *m = NULL;
routerinfo_t *ri;
/* We need to add our own fingerprint so it gets recognized. */
if (dirserv_add_own_fingerprint(options->Nickname, get_identity_key())) {
if (dirserv_add_own_fingerprint(options->Nickname,
get_server_identity_key())) {
log_err(LD_GENERAL,"Error adding own fingerprint to approved set");
return -1;
}
@ -588,7 +634,8 @@ init_keys(void)
/* 5. Dump fingerprint to 'fingerprint' */
keydir = get_datadir_fname("fingerprint");
log_info(LD_GENERAL,"Dumping fingerprint to \"%s\"...",keydir);
if (crypto_pk_get_fingerprint(get_identity_key(), fingerprint, 0)<0) {
if (crypto_pk_get_fingerprint(get_server_identity_key(),
fingerprint, 0) < 0) {
log_err(LD_GENERAL,"Error computing fingerprint");
tor_free(keydir);
return -1;
@ -626,7 +673,7 @@ init_keys(void)
return -1;
}
/* 6b. [authdirserver only] add own key to approved directories. */
crypto_pk_get_digest(get_identity_key(), digest);
crypto_pk_get_digest(get_server_identity_key(), digest);
type = ((options->V1AuthoritativeDir ? V1_AUTHORITY : NO_AUTHORITY) |
(options->V2AuthoritativeDir ? V2_AUTHORITY : NO_AUTHORITY) |
(options->V3AuthoritativeDir ? V3_AUTHORITY : NO_AUTHORITY) |
@ -1178,11 +1225,12 @@ router_my_exit_policy_is_reject_star(void)
}
/** Return true iff I'm a server and <b>digest</b> is equal to
* my identity digest. */
* my server identity key digest. */
int
router_digest_is_me(const char *digest)
{
return identitykey && !memcmp(identitykey_digest, digest, DIGEST_LEN);
return (server_identitykey &&
!memcmp(server_identitykey_digest, digest, DIGEST_LEN));
}
/** Return true iff I'm a server and <b>digest</b> is equal to
@ -1325,7 +1373,7 @@ router_rebuild_descriptor(int force)
ri->cache_info.published_on = time(NULL);
ri->onion_pkey = crypto_pk_dup_key(get_onion_key()); /* must invoke from
* main thread */
ri->identity_pkey = crypto_pk_dup_key(get_identity_key());
ri->identity_pkey = crypto_pk_dup_key(get_server_identity_key());
if (crypto_pk_get_digest(ri->identity_pkey,
ri->cache_info.identity_digest)<0) {
routerinfo_free(ri);
@ -1420,7 +1468,8 @@ router_rebuild_descriptor(int force)
ei_size = options->ExtraInfoStatistics ? MAX_EXTRAINFO_UPLOAD_SIZE : 8192;
ei->cache_info.signed_descriptor_body = tor_malloc(ei_size);
if (extrainfo_dump_to_string(ei->cache_info.signed_descriptor_body,
ei_size, ei, get_identity_key()) < 0) {
ei_size, ei,
get_server_identity_key()) < 0) {
log_warn(LD_BUG, "Couldn't generate extra-info descriptor.");
routerinfo_free(ri);
extrainfo_free(ei);
@ -1437,7 +1486,7 @@ router_rebuild_descriptor(int force)
DIGEST_LEN);
ri->cache_info.signed_descriptor_body = tor_malloc(8192);
if (router_dump_router_to_string(ri->cache_info.signed_descriptor_body, 8192,
ri, get_identity_key())<0) {
ri, get_server_identity_key()) < 0) {
log_warn(LD_BUG, "Couldn't generate router descriptor.");
routerinfo_free(ri);
extrainfo_free(ei);
@ -2186,7 +2235,8 @@ router_free_all(void)
{
crypto_free_pk_env(onionkey);
crypto_free_pk_env(lastonionkey);
crypto_free_pk_env(identitykey);
crypto_free_pk_env(server_identitykey);
crypto_free_pk_env(client_identitykey);
tor_mutex_free(key_lock);
routerinfo_free(desc_routerinfo);
extrainfo_free(desc_extrainfo);

9
src/or/router.h
View File

@ -14,9 +14,12 @@
crypto_pk_env_t *get_onion_key(void);
time_t get_onion_key_set_at(void);
void set_identity_key(crypto_pk_env_t *k);
crypto_pk_env_t *get_identity_key(void);
int identity_key_is_set(void);
void set_server_identity_key(crypto_pk_env_t *k);
crypto_pk_env_t *get_server_identity_key(void);
int server_identity_key_is_set(void);
void set_client_identity_key(crypto_pk_env_t *k);
crypto_pk_env_t *get_client_identity_key(void);
int client_identity_key_is_set(void);
authority_cert_t *get_my_v3_authority_cert(void);
crypto_pk_env_t *get_my_v3_authority_signing_key(void);
authority_cert_t *get_my_v3_legacy_cert(void);