From f106af3c41dffdc8576c52399a61d34116b78f38 Mon Sep 17 00:00:00 2001
From: George Kadianakis <desnacked@riseup.net>
Date: Thu, 3 Aug 2017 16:00:18 +0300
Subject: Make ed25519 id keys optional for IPs and RPs.

---
 src/or/hs_circuit.c    |  6 ++++--
 src/or/hs_descriptor.c |  8 ++++++++
 src/or/hs_service.c    | 11 +++++++----
 3 files changed, 19 insertions(+), 6 deletions(-)

(limited to 'src/or')

diff --git a/src/or/hs_circuit.c b/src/or/hs_circuit.c
index c78ac6057f..3d67f24cb8 100644
--- a/src/or/hs_circuit.c
+++ b/src/or/hs_circuit.c
@@ -406,7 +406,7 @@ get_rp_extend_info(const smartlist_t *link_specifiers,
   } SMARTLIST_FOREACH_END(ls);
 
   /* IPv4, legacy ID and ed25519 are mandatory. */
-  if (!have_v4 || !have_legacy_id || !have_ed25519_id) {
+  if (!have_v4 || !have_legacy_id) {
     goto done;
   }
   /* By default, we pick IPv4 but this might change to v6 if certain
@@ -451,7 +451,9 @@ get_rp_extend_info(const smartlist_t *link_specifiers,
   }
 
   /* We do have everything for which we think we can connect successfully. */
-  info = extend_info_new(NULL, legacy_id, &ed25519_pk, NULL, onion_key,
+  info = extend_info_new(NULL, legacy_id,
+                         have_ed25519_id ? &ed25519_pk : NULL,
+                         NULL, onion_key,
                          addr, port);
  done:
   return info;
diff --git a/src/or/hs_descriptor.c b/src/or/hs_descriptor.c
index 700d1b0cfc..430e2f6f99 100644
--- a/src/or/hs_descriptor.c
+++ b/src/or/hs_descriptor.c
@@ -2471,9 +2471,17 @@ hs_desc_link_specifier_new(const extend_info_t *info, uint8_t type)
     ls->u.ap.port = info->port;
     break;
   case LS_LEGACY_ID:
+    /* Bug out if the identity digest is not set */
+    if (BUG(tor_mem_is_zero(info->identity_digest,
+                            sizeof(info->identity_digest)))) {
+      goto err;
+    }
     memcpy(ls->u.legacy_id, info->identity_digest, sizeof(ls->u.legacy_id));
     break;
   case LS_ED25519_ID:
+    if (ed25519_public_key_is_zero(&info->ed_identity)) {
+      goto err;
+    }
     memcpy(ls->u.ed25519_id, info->ed_identity.pubkey,
            sizeof(ls->u.ed25519_id));
     break;
diff --git a/src/or/hs_service.c b/src/or/hs_service.c
index 86e7d40cb7..a6f548d319 100644
--- a/src/or/hs_service.c
+++ b/src/or/hs_service.c
@@ -394,6 +394,7 @@ service_intro_point_new(const extend_info_t *ei, unsigned int is_legacy)
     goto err;
   }
   smartlist_add(ip->base.link_specifiers, ls);
+
   ls = hs_desc_link_specifier_new(ei, LS_LEGACY_ID);
   /* It is impossible to have an extend info object without an identity
    * digest. */
@@ -401,11 +402,13 @@ service_intro_point_new(const extend_info_t *ei, unsigned int is_legacy)
     goto err;
   }
   smartlist_add(ip->base.link_specifiers, ls);
+
+  /* ed25519 identity key is optional */
   ls = hs_desc_link_specifier_new(ei, LS_ED25519_ID);
-  /* It is impossible to have an extend info object without an ed25519
-   * identity key. */
-  tor_assert(ls);
-  smartlist_add(ip->base.link_specifiers, ls);
+  if (ls) {
+    smartlist_add(ip->base.link_specifiers, ls);
+  }
+
   /* IPv6 is optional. */
   ls = hs_desc_link_specifier_new(ei, LS_IPV6);
   if (ls) {
-- 
cgit v1.2.3-54-g00ecf