commit 0f27d92e4c420cae8fff0ab889ad8494461d6f8e Author: David Goulet dgoulet@torproject.org Date: Wed May 11 10:21:34 2016 -0400

prop250: Add version to Commit line in vote and state

Signed-off-by: David Goulet dgoulet@torproject.org --- src/or/shared_random.c | 38 ++++++++++++++++++++++++++------------ src/or/shared_random_state.c | 3 ++- 2 files changed, 28 insertions(+), 13 deletions(-)

diff --git a/src/or/shared_random.c b/src/or/shared_random.c index e56a239..6e6ff3b 100644 --- a/src/or/shared_random.c +++ b/src/or/shared_random.c @@ -97,6 +97,7 @@ #include "router.h" #include "routerlist.h" #include "shared_random_state.h" +#include "util.h"

/* String prefix of shared random values in votes/consensuses. */ static const char previous_srv_str[] = "shared-rand-previous-value"; @@ -461,8 +462,9 @@ get_vote_line_from_commit(const sr_commit_t *commit, sr_phase_t phase)

switch (phase) { case SR_PHASE_COMMIT: - tor_asprintf(&vote_line, "%s %s %s %s\n", + tor_asprintf(&vote_line, "%s %u %s %s %s\n", commit_ns_str, + SR_PROTO_VERSION, crypto_digest_algorithm_get_name(commit->alg), sr_commit_get_rsa_fpr(commit), commit->encoded_commit); @@ -475,8 +477,9 @@ get_vote_line_from_commit(const sr_commit_t *commit, sr_phase_t phase) sizeof(commit->encoded_reveal))) { reveal_str = ""; } - tor_asprintf(&vote_line, "%s %s %s %s %s\n", + tor_asprintf(&vote_line, "%s %u %s %s %s %s\n", commit_ns_str, + SR_PROTO_VERSION, crypto_digest_algorithm_get_name(commit->alg), sr_commit_get_rsa_fpr(commit), commit->encoded_commit, reveal_str); @@ -1040,22 +1043,33 @@ sr_parse_srv(const smartlist_t *args) * allocated commit object. NULL is returned on error. * * The commit's data is in <b>args</b> and the order matters very much: - * algname, RSA fingerprint, commit value[, reveal value] + * version, algname, RSA fingerprint, commit value[, reveal value] */ sr_commit_t * sr_parse_commit(const smartlist_t *args) { + uint32_t version; char *value, digest[DIGEST_LEN]; digest_algorithm_t alg; const char *rsa_identity_fpr; sr_commit_t *commit = NULL;

- if (smartlist_len(args) < 3) { + if (smartlist_len(args) < 4) { goto error; }

- /* First argument is the algorithm. */ + /* First is the version number of the SR protocol which indicates at which + * version that commit was created. */ value = smartlist_get(args, 0); + version = (uint32_t) tor_parse_ulong(value, 10, 1, UINT32_MAX, NULL, NULL); + if (version > SR_PROTO_VERSION) { + log_info(LD_DIR, "SR: Commit version %" PRIu32 " (%s) is not supported.", + version, escaped(value)); + goto error; + } + + /* Second is the algorithm. */ + value = smartlist_get(args, 1); alg = crypto_digest_algorithm_parse_name(value); if (alg != SR_DIGEST_ALG) { log_warn(LD_BUG, "SR: Commit algorithm %s is not recognized.", @@ -1063,9 +1077,9 @@ sr_parse_commit(const smartlist_t *args) goto error; }

- /* Second argument is the RSA fingerprint of the auth and turn it into a + /* Third argument is the RSA fingerprint of the auth and turn it into a * digest value. */ - rsa_identity_fpr = smartlist_get(args, 1); + rsa_identity_fpr = smartlist_get(args, 2); if (base16_decode(digest, DIGEST_LEN, rsa_identity_fpr, HEX_DIGEST_LEN) < 0) { log_warn(LD_DIR, "SR: RSA fingerprint '%s' not decodable", @@ -1085,15 +1099,15 @@ sr_parse_commit(const smartlist_t *args) /* Allocate commit since we have a valid identity now. */ commit = commit_new(digest);

- /* Third argument is the commitment value base64-encoded. */ - value = smartlist_get(args, 2); + /* Fourth argument is the commitment value base64-encoded. */ + value = smartlist_get(args, 3); if (commit_decode(value, commit) < 0) { goto error; }

- /* (Optional) Fourth argument is the revealed value. */ - if (smartlist_len(args) > 3) { - value = smartlist_get(args, 3); + /* (Optional) Fifth argument is the revealed value. */ + if (smartlist_len(args) > 4) { + value = smartlist_get(args, 4); if (reveal_decode(value, commit) < 0) { goto error; } diff --git a/src/or/shared_random_state.c b/src/or/shared_random_state.c index 115d954..9700bf5 100644 --- a/src/or/shared_random_state.c +++ b/src/or/shared_random_state.c @@ -563,7 +563,8 @@ disk_state_put_commit_line(const sr_commit_t *commit, config_line_t *line) /* Add extra whitespace so we can format the line correctly. */ tor_asprintf(&reveal_str, " %s", commit->encoded_reveal); } - tor_asprintf(&line->value, "%s %s %s%s", + tor_asprintf(&line->value, "%u %s %s %s%s", + SR_PROTO_VERSION, crypto_digest_algorithm_get_name(commit->alg), sr_commit_get_rsa_fpr(commit), commit->encoded_commit,