mirror of
https://gitlab.torproject.org/tpo/core/tor.git
synced 2024-11-10 21:23:58 +01:00
separate validation from naming in authoritative directory servers; simplify some router-management code.
svn:r5069
This commit is contained in:
parent
d4e0af7822
commit
e83e1df811
160
src/or/dirserv.c
160
src/or/dirserv.c
@ -19,6 +19,13 @@ const char dirserv_c_id[] = "$Id$";
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extern long stats_n_seconds_working;
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typedef enum {
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FP_NAMED, /**< Listed in fingerprint file. */
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FP_VALID, /**< Unlisted but believed valid. */
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FP_INVALID, /**< Believed invalid. */
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FP_REJECT, /**< We will not publish this router. */
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} router_status_t;
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/** Do we need to regenerate the directory when someone asks for it? */
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static int the_directory_is_dirty = 1;
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static int runningrouters_is_dirty = 1;
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@ -30,6 +37,8 @@ static char *format_versions_list(config_line_t *ln);
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/* Should be static; exposed for testing */
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int add_fingerprint_to_dir(const char *nickname, const char *fp, smartlist_t *list);
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static int router_is_general_exit(routerinfo_t *ri);
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static router_status_t dirserv_router_get_status(const routerinfo_t *router,
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const char **msg);
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/************** Fingerprint handling code ************/
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@ -153,44 +162,51 @@ dirserv_parse_fingerprint_file(const char *fname)
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}
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/** Check whether <b>router</b> has a nickname/identity key combination that
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* we recognize from the fingerprint list. Return 1 if router's
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* identity and nickname match, -1 if we recognize the nickname but
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* the identity key is wrong, and 0 if the nickname is not known. */
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int
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dirserv_router_fingerprint_is_known(const routerinfo_t *router)
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* we recognize from the fingerprint list, or an IP we automatically act on
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* according to our configuration. Return the appropriate disposition.
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* DOCDOC msg is set on reject, if provided.
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*/
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static router_status_t
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dirserv_router_get_status(const routerinfo_t *router, const char **msg)
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{
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int i, found=0;
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fingerprint_entry_t *ent =NULL;
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fingerprint_entry_t *nn_ent = NULL;
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char fp[FINGERPRINT_LEN+1];
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if (!fingerprint_list)
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fingerprint_list = smartlist_create();
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log_fn(LOG_DEBUG, "%d fingerprints known.", smartlist_len(fingerprint_list));
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for (i=0;i<smartlist_len(fingerprint_list);++i) {
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ent = smartlist_get(fingerprint_list, i);
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log_fn(LOG_DEBUG,"%s vs %s", router->nickname, ent->nickname);
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SMARTLIST_FOREACH(fingerprint_list, fingerprint_entry_t *, ent,
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{
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if (!strcasecmp(router->nickname,ent->nickname)) {
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found = 1;
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nn_ent = ent;
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break;
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}
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}
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});
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if (!found) { /* No such server known */
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log_fn(LOG_INFO,"no fingerprint found for '%s'",router->nickname);
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if (!nn_ent) { /* No such server known with that nickname */
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if (tor_version_as_new_as(router->platform,"0.1.0.2-rc"))
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return FP_VALID;
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else
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return FP_INVALID;
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log_fn(LOG_INFO,"No fingerprint found for '%s'",router->nickname);
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return 0;
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}
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if (crypto_pk_get_fingerprint(router->identity_pkey, fp, 0)) {
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log_fn(LOG_WARN,"error computing fingerprint");
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log_fn(LOG_WARN,"Error computing fingerprint");
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return -1;
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}
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if (0==strcasecmp(ent->fingerprint, fp)) {
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log_fn(LOG_DEBUG,"good fingerprint for '%s'",router->nickname);
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return 1; /* Right fingerprint. */
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if (0==strcasecmp(nn_ent->fingerprint, fp)) {
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log_fn(LOG_DEBUG,"Good fingerprint for '%s'",router->nickname);
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return FP_NAMED; /* Right fingerprint. */
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} else {
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log_fn(LOG_WARN,"mismatched fingerprint for '%s': expected '%s' got '%s'",
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router->nickname, ent->fingerprint, fp);
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return -1; /* Wrong fingerprint. */
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log_fn(LOG_WARN,"Mismatched fingerprint for '%s': expected '%s' got '%s'. ContactInfo '%s', platform '%s'.)",
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router->nickname, nn_ent->fingerprint, fp,
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router->contact_info ? router->contact_info : "",
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router->platform ? router->platform : "");
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if (msg)
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*msg = "Rejected: There is already a verified server with this nickname and a different fingerprint.";
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return FP_REJECT; /* Wrong fingerprint. */
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}
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}
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@ -266,33 +282,20 @@ dirserv_router_has_valid_address(routerinfo_t *ri)
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return 0;
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}
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/** DOCDOC */
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/** Check whether we, as a directory server, want to accept <b>ri</b>. If so,
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* return 0, and set its is_valid and is_named fields. Otherwise, return -1.
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* DOCDOC msg
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*/
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int
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dirserv_wants_to_reject_router(routerinfo_t *ri, int *verified,
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authdir_wants_to_reject_router(routerinfo_t *ri,
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const char **msg)
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{
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/* Okay. Now check whether the fingerprint is recognized. */
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int r = dirserv_router_fingerprint_is_known(ri);
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router_status_t status = dirserv_router_get_status(ri, msg);
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time_t now;
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if (r==-1) {
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log_fn(LOG_WARN, "Known nickname '%s', wrong fingerprint. Not adding (ContactInfo '%s', platform '%s').",
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ri->nickname, ri->contact_info ? ri->contact_info : "",
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ri->platform ? ri->platform : "");
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*msg = "Rejected: There is already a verified server with this nickname and a different fingerprint.";
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return -1;
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} else if (r==0) {
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char fp[FINGERPRINT_LEN+1];
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log_fn(LOG_INFO, "Unknown nickname '%s' (%s:%d). Will try to add.",
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ri->nickname, ri->address, ri->or_port);
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if (crypto_pk_get_fingerprint(ri->identity_pkey, fp, 1) < 0) {
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log_fn(LOG_WARN, "Error computing fingerprint for '%s'", ri->nickname);
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} else {
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log_fn(LOG_INFO, "Fingerprint line: %s %s", ri->nickname, fp);
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}
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*verified = 0;
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} else {
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*verified = 1;
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}
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if (status == FP_REJECT)
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return -1; /* msg is already set. */
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/* Is there too much clock skew? */
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now = time(NULL);
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if (ri->published_on > now+ROUTER_ALLOW_SKEW) {
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@ -319,6 +322,22 @@ dirserv_wants_to_reject_router(routerinfo_t *ri, int *verified,
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*msg = "Rejected: Address is not an IP, or IP is a private address.";
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return -1;
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}
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/* Okay, looks like we're willing to accept this one. */
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switch (status) {
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case FP_NAMED:
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ri->is_named = ri->is_verified = 1;
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break;
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case FP_VALID:
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ri->is_named = 0;
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ri->is_verified = 1;
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break;
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case FP_INVALID:
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ri->is_named = ri->is_verified = 0;
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break;
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default:
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tor_assert(0);
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}
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return 0;
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}
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@ -331,7 +350,6 @@ dirserv_wants_to_reject_router(routerinfo_t *ri, int *verified,
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* 0 if well-formed but redundant with one we already have;
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* -1 if it looks vaguely like a router descriptor but rejected;
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* -2 if we can't find a router descriptor in <b>desc</b>.
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*
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*/
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int
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dirserv_add_descriptor(const char *desc, const char **msg)
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@ -378,22 +396,39 @@ directory_remove_invalid(void)
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return;
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for (i = 0; i < smartlist_len(descriptor_list); ++i) {
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const char *msg;
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routerinfo_t *ent = smartlist_get(descriptor_list, i);
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int r = dirserv_router_fingerprint_is_known(ent);
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if (r<0) {
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log(LOG_INFO, "Router '%s' is now verified with a key; removing old router with same name and different key.",
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ent->nickname);
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routerinfo_free(ent);
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smartlist_del(descriptor_list, i--);
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changed = 1;
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} else if (r>0 && !ent->is_verified) {
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log(LOG_INFO, "Router '%s' is now approved.", ent->nickname);
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ent->is_verified = ent->is_named = 1;
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changed = 1;
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} else if (r==0 && ent->is_verified) {
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log(LOG_INFO, "Router '%s' is no longer approved.", ent->nickname);
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ent->is_verified = ent->is_named = 0;
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changed = 1;
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router_status_t r = dirserv_router_get_status(ent, &msg);
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switch (r) {
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case FP_REJECT:
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log(LOG_INFO, "Router '%s' is now rejected: %s",
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ent->nickname, msg?msg:"");
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routerinfo_free(ent);
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smartlist_del(descriptor_list, i--);
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changed = 1;
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break;
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case FP_NAMED:
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if (!ent->is_verified || !ent->is_named) {
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log(LOG_INFO, "Router '%s' is now verified and named.", ent->nickname);
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ent->is_verified = ent->is_named = 1;
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changed = 1;
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}
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break;
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case FP_VALID:
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if (!ent->is_verified || ent->is_named) {
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log(LOG_INFO, "Router '%s' is now verified.", ent->nickname);
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ent->is_verified = 1;
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ent->is_named = 0;
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changed = 1;
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}
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break;
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case FP_INVALID:
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if (ent->is_verified || ent->is_named) {
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log(LOG_INFO, "Router '%s' is no longer verified.", ent->nickname);
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ent->is_verified = ent->is_named = 0;
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changed = 1;
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}
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break;
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}
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}
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if (changed)
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@ -407,7 +442,8 @@ directory_remove_invalid(void)
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char *
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dirserver_getinfo_unregistered(const char *question)
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{
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int i, r;
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int i;
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router_status_t r;
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smartlist_t *answerlist;
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char buf[1024];
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char *answer;
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@ -421,10 +457,10 @@ dirserver_getinfo_unregistered(const char *question)
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answerlist = smartlist_create();
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for (i = 0; i < smartlist_len(descriptor_list); ++i) {
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ent = smartlist_get(descriptor_list, i);
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r = dirserv_router_fingerprint_is_known(ent);
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r = dirserv_router_get_status(ent, NULL);
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if (ent->bandwidthcapacity >= (size_t)min_bw &&
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ent->bandwidthrate >= (size_t)min_bw &&
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r == 0) {
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r != FP_NAMED) {
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/* then log this one */
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tor_snprintf(buf, sizeof(buf),
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"%s: BW %d on '%s'.",
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@ -847,7 +847,7 @@ typedef struct {
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* published? */
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/* XXXX011 NM This field is only used in moribund code; remove it
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* once the moribund code is dead. */
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time_t published_on_xx;
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time_t published_on_xx;
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#if 0
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/** Which versions of tor are recommended by this directory? */
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char *software_versions;
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@ -1713,7 +1713,6 @@ void free_dir_policy(void);
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int dirserv_add_own_fingerprint(const char *nickname, crypto_pk_env_t *pk);
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int dirserv_parse_fingerprint_file(const char *fname);
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int dirserv_router_fingerprint_is_known(const routerinfo_t *router);
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void dirserv_free_fingerprint_list(void);
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const char *dirserv_get_nickname_by_digest(const char *digest);
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int dirserv_add_descriptor(const char *desc, const char **msg);
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@ -1738,7 +1737,7 @@ void dirserv_orconn_tls_done(const char *address,
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const char *digest_rcvd,
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const char *nickname,
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int as_advertised);
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int dirserv_wants_to_reject_router(routerinfo_t *ri, int *verified,
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int authdir_wants_to_reject_router(routerinfo_t *ri,
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const char **msg);
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void dirserv_free_all(void);
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@ -916,7 +916,6 @@ routerlist_get_published_time(void)
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}
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#endif
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/** Free all storage held by <b>router</b>. */
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void
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routerinfo_free(routerinfo_t *router)
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@ -1072,6 +1071,8 @@ router_mark_as_down(const char *digest)
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* fine, but out-of-date. If the return value is equal to 1, the
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* routerinfo was accepted, but we should notify the generator of the
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* descriptor using the message *<b>msg</b>.
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*
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* DOCDOC very changed. Also, MUST call update_status_from_networkstatus first.
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*/
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int
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router_add_to_routerlist(routerinfo_t *router, const char **msg)
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@ -1091,15 +1092,9 @@ router_add_to_routerlist(routerinfo_t *router, const char **msg)
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crypto_pk_get_digest(router->identity_pkey, id_digest);
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if (authdir) {
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if (dirserv_wants_to_reject_router(router, &authdir_verified, msg)) {
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tor_assert(*msg);
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routerinfo_free(router);
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if (authdir_wants_to_reject_router(router, msg))
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return -2;
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}
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router->is_verified = authdir_verified;
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router->is_named = router->is_verified; /*XXXX NM not right. */
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if (tor_version_as_new_as(router->platform,"0.1.0.2-rc"))
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router->is_verified = 1;
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authdir_verified = router->is_verified;
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}
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/* If we have a router with this name, and the identity key is the same,
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@ -1109,20 +1104,14 @@ router_add_to_routerlist(routerinfo_t *router, const char **msg)
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routerinfo_t *old_router = smartlist_get(routerlist->routers, i);
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if (!crypto_pk_cmp_keys(router->identity_pkey,old_router->identity_pkey)) {
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if (router->published_on <= old_router->published_on) {
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/* Same key, but old */
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log_fn(LOG_DEBUG, "Skipping not-new descriptor for router '%s'",
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router->nickname);
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if (authdir) {
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/* Update the is_verified status based on our lookup. */
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old_router->is_verified = router->is_verified;
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old_router->is_named = router->is_named;
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} else {
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/* Update the is_running status to whatever we were told. */
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old_router->is_running = router->is_running;
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}
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routerinfo_free(router);
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*msg = "Router descriptor was not new.";
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return -1;
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} else {
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/* Same key, new. */
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int unreachable = 0;
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log_fn(LOG_DEBUG, "Replacing entry for router '%s/%s' [%s]",
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router->nickname, old_router->nickname,
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@ -1157,7 +1146,7 @@ router_add_to_routerlist(routerinfo_t *router, const char **msg)
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}
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} else if (!strcasecmp(router->nickname, old_router->nickname)) {
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/* nicknames match, keys don't. */
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if (router->is_verified) {
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if (router->is_named) {
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/* The new verified router replaces the old one; remove the
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* old one. And carry on to the end of the list, in case
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* there are more old unverified routers with this nickname
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@ -1174,7 +1163,7 @@ router_add_to_routerlist(routerinfo_t *router, const char **msg)
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}
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routerinfo_free(old_router);
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smartlist_del_keeporder(routerlist->routers, i--);
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} else if (old_router->is_verified) {
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} else if (old_router->is_named) {
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/* Can't replace a verified router with an unverified one. */
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log_fn(LOG_DEBUG, "Skipping unverified entry for verified router '%s'",
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router->nickname);
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@ -1668,8 +1657,11 @@ update_networkstatus_client_downloads(time_t now)
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/* Also, download at least 1 every NETWORKSTATUS_CLIENT_DL_INTERVAL. */
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if (n_running_dirservers &&
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most_recent_received < now-NETWORKSTATUS_CLIENT_DL_INTERVAL && needed < 1) {
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log_fn(LOG_NOTICE, "Our most recent network-status document is %d"
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" seconds old; downloading another.", (int)(now-most_recent_received));
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const char *addr = most_recent?most_recent->address:"nobody";
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int port = most_recent?most_recent->dir_port:0;
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log_fn(LOG_NOTICE, "Our most recent network-status document (from %s:%d) "
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"is %d seconds old; downloading another.",
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addr, port, (int)(now-most_recent_received));
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needed = 1;
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}
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