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[or-cvs] r14584: Implement a proposal to let a directory authority migrate it (in tor/trunk: . src/or)
Author: nickm
Date: 2008-05-11 22:14:01 -0400 (Sun, 11 May 2008)
New Revision: 14584
Modified:
tor/trunk/
tor/trunk/ChangeLog
tor/trunk/src/or/config.c
tor/trunk/src/or/dirserv.c
tor/trunk/src/or/dirvote.c
tor/trunk/src/or/or.h
tor/trunk/src/or/router.c
tor/trunk/src/or/routerparse.c
Log:
r19690@catbus: nickm | 2008-05-11 22:13:31 -0400
Implement a proposal to let a directory authority migrate its identity key without ceasing to sign consensuses.
/home/or/svnrepo/hooks/commit-email.pl: `/usr/bin/svnlook diff /home/or/svnrepo -r 14584' failed with this output:
Property changes on: tor/trunk
___________________________________________________________________
svk:merge ticket from /tor/trunk [r19690] on 8246c3cf-6607-4228-993b-4d95d33730f1
Modified: tor/trunk/ChangeLog
===================================================================
--- tor/trunk/ChangeLog 2008-05-11 10:27:34 UTC (rev 14583)
+++ tor/trunk/ChangeLog 2008-05-12 02:14:01 UTC (rev 14584)
@@ -78,10 +78,12 @@
- Make dumpstats() log the fullness and size of openssl-internal
buffers.
- Servers support a new URL scheme for consensus downloads that
- allos the client to specify which authorities are trusted.
+ allows the client to specify which authorities are trusted.
The server then only sends the consensus if the client will
trust it. Otherwise a 404 error is sent back. Clients use
this new scheme when the server supports it.
+ - Add a new V3AuthUseLegacyKey option to make it easier for authorities
+ to change their identity keys if they have to.
o Minor features (security):
- Reject requests for reverse-dns lookup of names in a private
Modified: tor/trunk/src/or/config.c
===================================================================
--- tor/trunk/src/or/config.c 2008-05-11 10:27:34 UTC (rev 14583)
+++ tor/trunk/src/or/config.c 2008-05-12 02:14:01 UTC (rev 14584)
@@ -301,6 +301,7 @@
V(V3AuthVoteDelay, INTERVAL, "5 minutes"),
V(V3AuthDistDelay, INTERVAL, "5 minutes"),
V(V3AuthNIntervalsValid, UINT, "3"),
+ V(V3AuthUseLegacyKey, BOOL, "0"),
VAR("VersioningAuthoritativeDirectory",BOOL,VersioningAuthoritativeDir, "0"),
V(VirtualAddrNetwork, STRING, "127.192.0.0/10"),
V(WarnPlaintextPorts, CSV, "23,109,110,143"),
Modified: tor/trunk/src/or/dirserv.c
===================================================================
--- tor/trunk/src/or/dirserv.c 2008-05-11 10:27:34 UTC (rev 14583)
+++ tor/trunk/src/or/dirserv.c 2008-05-12 02:14:01 UTC (rev 14584)
@@ -2285,6 +2285,13 @@
voter->or_port = options->ORPort;
voter->contact = tor_strdup(contact);
memcpy(voter->signing_key_digest, signing_key_digest, DIGEST_LEN);
+ if (options->V3AuthUseLegacyKey) {
+ authority_cert_t *c = get_my_v3_legacy_cert();
+ if (c) {
+ crypto_pk_get_digest(c->identity_key, voter->legacy_id_digest);
+ }
+ }
+
v3_out->voters = smartlist_create();
smartlist_add(v3_out->voters, voter);
v3_out->cert = authority_cert_dup(cert);
Modified: tor/trunk/src/or/dirvote.c
===================================================================
--- tor/trunk/src/or/dirvote.c 2008-05-11 10:27:34 UTC (rev 14583)
+++ tor/trunk/src/or/dirvote.c 2008-05-12 02:14:01 UTC (rev 14584)
@@ -105,7 +105,7 @@
tor_snprintf(status, len,
"network-status-version 3\n"
"vote-status vote\n"
- "consensus-methods 1 2\n"
+ "consensus-methods 1 2 3\n"
"published %s\n"
"valid-after %s\n"
"fresh-until %s\n"
@@ -125,6 +125,14 @@
tor_free(flags);
outp = status + strlen(status);
endp = status + len;
+
+ if (!tor_digest_is_zero(voter->legacy_id_digest)) {
+ char fpbuf[HEX_DIGEST_LEN+1];
+ base16_encode(fpbuf, sizeof(fpbuf), voter->legacy_id_digest, DIGEST_LEN);
+ tor_snprintf(outp, endp-outp, "legacy-dir-key %s\n", fpbuf);
+ outp += strlen(outp);
+ }
+
tor_assert(outp + cert->cache_info.signed_descriptor_len < endp);
memcpy(outp, cert->cache_info.signed_descriptor_body,
cert->cache_info.signed_descriptor_len);
@@ -207,6 +215,12 @@
return smartlist_get(vote->voters, 0);
}
+typedef struct {
+ networkstatus_t *v;
+ const char *digest;
+ int is_legacy;
+} dir_src_ent_t;
+
/** Helper for sorting networkstatus_t votes (not consensuses) by the
* hash of their voters' identity digests. */
static int
@@ -217,6 +231,19 @@
get_voter(b)->identity_digest, DIGEST_LEN);
}
+static int
+_compare_dir_src_ents_by_authority_id(const void **_a, const void **_b)
+{
+ const dir_src_ent_t *a = *_a, *b = *_b;
+ const networkstatus_voter_info_t *a_v = get_voter(a->v),
+ *b_v = get_voter(b->v);
+ const char *a_id, *b_id;
+ a_id = a->is_legacy ? a_v->legacy_id_digest : a_v->identity_digest;
+ b_id = b->is_legacy ? b_v->legacy_id_digest : b_v->identity_digest;
+
+ return memcmp(a_id, b_id, DIGEST_LEN);
+}
+
/** Given a sorted list of strings <b>in</b>, add every member to <b>out</b>
* that occurs more than <b>min</b> times. */
static void
@@ -416,7 +443,7 @@
static int
consensus_method_is_supported(int method)
{
- return (method >= 1) && (method <= 2);
+ return (method >= 1) && (method <= 3);
}
/** Given a list of vote networkstatus_t in <b>votes</b>, our public
@@ -581,34 +608,65 @@
/* Sort the votes. */
smartlist_sort(votes, _compare_votes_by_authority_id);
/* Add the authority sections. */
- SMARTLIST_FOREACH(votes, networkstatus_t *, v,
{
- char buf[1024];
- struct in_addr in;
- char ip[INET_NTOA_BUF_LEN];
- char fingerprint[HEX_DIGEST_LEN+1];
- char votedigest[HEX_DIGEST_LEN+1];
- networkstatus_voter_info_t *voter = get_voter(v);
+ smartlist_t *dir_sources = smartlist_create();
+ SMARTLIST_FOREACH(votes, networkstatus_t *, v,
+ {
+ dir_src_ent_t *e = tor_malloc_zero(sizeof(dir_src_ent_t));
+ e->v = v;
+ e->digest = get_voter(v)->identity_digest;
+ e->is_legacy = 0;
+ smartlist_add(dir_sources, e);
+ if (consensus_method >= 3 &&
+ !tor_digest_is_zero(get_voter(v)->legacy_id_digest)) {
+ dir_src_ent_t *e_legacy = tor_malloc_zero(sizeof(dir_src_ent_t));
+ e_legacy->v = v;
+ e_legacy->digest = get_voter(v)->legacy_id_digest;
+ e_legacy->is_legacy = 1;
+ smartlist_add(dir_sources, e);
+ }
+ });
+ smartlist_sort(dir_sources, _compare_dir_src_ents_by_authority_id);
- in.s_addr = htonl(voter->addr);
- tor_inet_ntoa(&in, ip, sizeof(ip));
- base16_encode(fingerprint, sizeof(fingerprint), voter->identity_digest,
- DIGEST_LEN);
- base16_encode(votedigest, sizeof(votedigest), voter->vote_digest,
- DIGEST_LEN);
+ SMARTLIST_FOREACH(dir_sources, const dir_src_ent_t *, e,
+ {
+ char buf[1024];
+ struct in_addr in;
+ char ip[INET_NTOA_BUF_LEN];
+ char fingerprint[HEX_DIGEST_LEN+1];
+ char votedigest[HEX_DIGEST_LEN+1];
+ networkstatus_t *v = e->v;
+ networkstatus_voter_info_t *voter = get_voter(v);
- tor_snprintf(buf, sizeof(buf),
- "dir-source %s %s %s %s %d %d\n"
- "contact %s\n"
- "vote-digest %s\n",
- voter->nickname, fingerprint, voter->address, ip,
- voter->dir_port,
- voter->or_port,
- voter->contact,
- votedigest);
- smartlist_add(chunks, tor_strdup(buf));
- });
+ if (e->is_legacy)
+ tor_assert(consensus_method >= 2);
+ in.s_addr = htonl(voter->addr);
+ tor_inet_ntoa(&in, ip, sizeof(ip));
+ base16_encode(fingerprint, sizeof(fingerprint), e->digest, DIGEST_LEN);
+ base16_encode(votedigest, sizeof(votedigest), voter->vote_digest,
+ DIGEST_LEN);
+
+ tor_snprintf(buf, sizeof(buf),
+ "dir-source %s%s %s %s %s %d %d\n",
+ voter->nickname, e->is_legacy ? "-legacy" : "",
+ fingerprint, voter->address, ip,
+ voter->dir_port,
+ voter->or_port);
+ smartlist_add(chunks, tor_strdup(buf));
+ if (! e->is_legacy) {
+ tor_snprintf(buf, sizeof(buf),
+ "contact %s\n"
+ "vote-digest %s\n",
+ voter->contact,
+ votedigest);
+ smartlist_add(chunks, tor_strdup(buf));
+ }
+ });
+ SMARTLIST_FOREACH(dir_sources, dir_src_ent_t *, e, tor_free(e));
+ smartlist_free(dir_sources);
+ }
+
/* Add the actual router entries. */
{
int *index; /* index[j] is the current index into votes[j]. */
@@ -904,6 +962,22 @@
return NULL; /* This leaks, but it should never happen. */
}
smartlist_add(chunks, tor_strdup(buf));
+
+ if (get_options()->V3AuthUseLegacyKey && consensus_method >= 3) {
+ crypto_pk_env_t *legacy_key = get_my_v3_legacy_signing_key();
+ authority_cert_t *legacy_cert = get_my_v3_legacy_cert();
+ smartlist_add(chunks, tor_strdup("directory-signature "));
+ crypto_pk_get_fingerprint(legacy_cert->identity_key, fingerprint, 0);
+ crypto_pk_get_fingerprint(legacy_key, signing_key_fingerprint, 0);
+ tor_snprintf(buf, sizeof(buf), "%s %s\n", fingerprint,
+ signing_key_fingerprint);
+ if (router_append_dirobj_signature(buf, sizeof(buf), digest,
+ signing_key)) {
+ log_warn(LD_BUG, "Couldn't sign consensus networkstatus.");
+ return NULL; /* This leaks, but it should never happen. */
+ }
+ smartlist_add(chunks, tor_strdup(buf));
+ }
}
result = smartlist_join_strings(chunks, "", 0, NULL);
Modified: tor/trunk/src/or/or.h
===================================================================
--- tor/trunk/src/or/or.h 2008-05-11 10:27:34 UTC (rev 14583)
+++ tor/trunk/src/or/or.h 2008-05-12 02:14:01 UTC (rev 14584)
@@ -1461,6 +1461,7 @@
uint16_t or_port; /**< OR port of this voter */
char *contact; /**< Contact information for this voter. */
char vote_digest[DIGEST_LEN]; /**< Digest of this voter's vote, as signed. */
+ char legacy_id_digest[DIGEST_LEN]; /**< From vote only. DOCDOC */
/* Nothing from here on is signed. */
char signing_key_digest[DIGEST_LEN]; /**< Declared digest of signing key
@@ -2339,6 +2340,10 @@
/** The number of intervals we think a consensus should be valid. */
int V3AuthNIntervalsValid;
+ /** Should advertise and sign consensuses with a legacy key, for key
+ * migration purposes? */
+ int V3AuthUseLegacyKey;
+
/** File to check for a consensus networkstatus, if we don't have one
* cached. */
char *FallbackNetworkstatusFile;
@@ -3772,6 +3777,8 @@
int 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);
+crypto_pk_env_t *get_my_v3_legacy_signing_key(void);
void dup_onion_keys(crypto_pk_env_t **key, crypto_pk_env_t **last);
void rotate_onion_key(void);
crypto_pk_env_t *init_key_from_file(const char *fname, int generate,
Modified: tor/trunk/src/or/router.c
===================================================================