hs: Remove hs_intro_auth_key_type_t enum

Like the previous commit about the INTRODUCE_ACK status code, change all auth
key type to use the one defined in the trunnel file.

Standardize the use of these auth type to a common ABI.

Part of #30454

Signed-off-by: David Goulet <dgoulet@torproject.org>

src/or/hs_cell.c

@@ -441,7 +441,8 @@ introduce1_set_auth_key(trn_cell_introduce1_t *cell,
   tor_assert(cell);
   tor_assert(data);
   /* There is only one possible type for a non legacy cell. */
-  trn_cell_introduce1_set_auth_key_type(cell, HS_INTRO_AUTH_KEY_TYPE_ED25519);
+  trn_cell_introduce1_set_auth_key_type(cell,
+                                   TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_ED25519);
   trn_cell_introduce1_set_auth_key_len(cell, ED25519_PUBKEY_LEN);
   trn_cell_introduce1_setlen_auth_key(cell, ED25519_PUBKEY_LEN);
   memcpy(trn_cell_introduce1_getarray_auth_key(cell),
@@ -514,7 +515,7 @@ hs_cell_build_establish_intro(const char *circ_nonce,
 
   /* Set AUTH_KEY_TYPE: 2 means ed25519 */
   trn_cell_establish_intro_set_auth_key_type(cell,
-                                             HS_INTRO_AUTH_KEY_TYPE_ED25519);
+                                    TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_ED25519);
 
   /* Set AUTH_KEY and AUTH_KEY_LEN field. Must also set byte-length of
    * AUTH_KEY to match */

src/or/hs_intropoint.c

@@ -75,7 +75,7 @@ verify_establish_intro_cell(const trn_cell_establish_intro_t *cell,
   /* We only reach this function if the first byte of the cell is 0x02 which
    * means that auth_key_type is of ed25519 type, hence this check should
    * always pass. See hs_intro_received_establish_intro().  */
-  if (BUG(cell->auth_key_type != HS_INTRO_AUTH_KEY_TYPE_ED25519)) {
+  if (BUG(cell->auth_key_type != TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_ED25519)) {
     return -1;
   }
 
@@ -315,10 +315,10 @@ hs_intro_received_establish_intro(or_circuit_t *circ, const uint8_t *request,
    * ESTABLISH_INTRO and pass it to the appropriate cell handler */
   const uint8_t first_byte = request[0];
   switch (first_byte) {
-    case HS_INTRO_AUTH_KEY_TYPE_LEGACY0:
-    case HS_INTRO_AUTH_KEY_TYPE_LEGACY1:
+    case TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY0:
+    case TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY1:
       return rend_mid_establish_intro_legacy(circ, request, request_len);
-    case HS_INTRO_AUTH_KEY_TYPE_ED25519:
+    case TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_ED25519:
       return handle_establish_intro(circ, request, request_len);
     default:
       log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
@@ -396,7 +396,7 @@ validate_introduce1_parsed_cell(const trn_cell_introduce1_t *cell)
   /* The auth key of an INTRODUCE1 should be of type ed25519 thus leading to a
    * known fixed length as well. */
   if (trn_cell_introduce1_get_auth_key_type(cell) !=
-      HS_INTRO_AUTH_KEY_TYPE_ED25519) {
+      TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_ED25519) {
     log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL,
            "Rejecting invalid INTRODUCE1 cell auth key type. "
            "Responding with NACK.");

src/or/hs_intropoint.h

@@ -12,13 +12,6 @@
 #include "crypto_curve25519.h"
 #include "torcert.h"
 
-/* Authentication key type in an ESTABLISH_INTRO cell. */
-typedef enum {
-  HS_INTRO_AUTH_KEY_TYPE_LEGACY0 = 0x00,
-  HS_INTRO_AUTH_KEY_TYPE_LEGACY1 = 0x01,
-  HS_INTRO_AUTH_KEY_TYPE_ED25519 = 0x02,
-} hs_intro_auth_key_type_t;
-
 /* Object containing introduction point common data between the service and
  * the client side. */
 typedef struct hs_intropoint_t {

src/test/test_hs_cell.c

@@ -50,7 +50,7 @@ test_gen_establish_intro_cell(void *arg)
   /* Check the contents of the cell */
   {
     /* First byte is the auth key type: make sure its correct */
-    tt_int_op(buf[0], OP_EQ, HS_INTRO_AUTH_KEY_TYPE_ED25519);
+    tt_int_op(buf[0], OP_EQ, TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_ED25519);
     /* Next two bytes is auth key len */
     tt_int_op(ntohs(get_uint16(buf+1)), OP_EQ, ED25519_PUBKEY_LEN);
     /* Skip to the number of extensions: no extensions */

src/test/test_hs_intropoint.c

@@ -138,7 +138,7 @@ helper_create_introduce1_cell(void)
   {
     size_t auth_key_len = sizeof(auth_key_kp.pubkey);
     trn_cell_introduce1_set_auth_key_type(cell,
-                                         HS_INTRO_AUTH_KEY_TYPE_ED25519);
+                                     TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_ED25519);
     trn_cell_introduce1_set_auth_key_len(cell, auth_key_len);
     trn_cell_introduce1_setlen_auth_key(cell, auth_key_len);
     uint8_t *auth_key_ptr = trn_cell_introduce1_getarray_auth_key(cell);
@@ -749,7 +749,7 @@ test_introduce1_validation(void *arg)
   ret = validate_introduce1_parsed_cell(cell);
   tt_int_op(ret, OP_EQ, -1);
   /* Reset is to correct value and make sure it's correct. */
-  cell->auth_key_type = HS_INTRO_AUTH_KEY_TYPE_ED25519;
+  cell->auth_key_type = TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_ED25519;
   ret = validate_introduce1_parsed_cell(cell);
   tt_int_op(ret, OP_EQ, 0);
 

src/trunnel/hs/cell_introduce1.c

@@ -50,6 +50,7 @@ trn_cell_introduce1_new(void)
   trn_cell_introduce1_t *val = trunnel_calloc(1, sizeof(trn_cell_introduce1_t));
   if (NULL == val)
     return NULL;
+  val->auth_key_type = TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_ED25519;
   return val;
 }
 
@@ -121,7 +122,7 @@ trn_cell_introduce1_get_auth_key_type(const trn_cell_introduce1_t *inp)
 int
 trn_cell_introduce1_set_auth_key_type(trn_cell_introduce1_t *inp, uint8_t val)
 {
-  if (! ((val == 0 || val == 1 || val == 2))) {
+  if (! ((val == TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_ED25519 || val == TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY0 || val == TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY1))) {
      TRUNNEL_SET_ERROR_CODE(inp);
      return -1;
   }
@@ -295,7 +296,7 @@ trn_cell_introduce1_check(const trn_cell_introduce1_t *obj)
     return "Object was NULL";
   if (obj->trunnel_error_code_)
     return "A set function failed on this object";
-  if (! (obj->auth_key_type == 0 || obj->auth_key_type == 1 || obj->auth_key_type == 2))
+  if (! (obj->auth_key_type == TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_ED25519 || obj->auth_key_type == TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY0 || obj->auth_key_type == TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY1))
     return "Integer out of bounds";
   if (TRUNNEL_DYNARRAY_LEN(&obj->auth_key) != obj->auth_key_len)
     return "Length mismatch for auth_key";
@@ -319,7 +320,7 @@ trn_cell_introduce1_encoded_len(const trn_cell_introduce1_t *obj)
   /* Length of u8 legacy_key_id[TRUNNEL_SHA1_LEN] */
   result += TRUNNEL_SHA1_LEN;
 
-  /* Length of u8 auth_key_type IN [0, 1, 2] */
+  /* Length of u8 auth_key_type IN [TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_ED25519, TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY0, TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY1] */
   result += 1;
 
   /* Length of u16 auth_key_len */
@@ -367,7 +368,7 @@ trn_cell_introduce1_encode(uint8_t *output, const size_t avail, const trn_cell_i
   memcpy(ptr, obj->legacy_key_id, TRUNNEL_SHA1_LEN);
   written += TRUNNEL_SHA1_LEN; ptr += TRUNNEL_SHA1_LEN;
 
-  /* Encode u8 auth_key_type IN [0, 1, 2] */
+  /* Encode u8 auth_key_type IN [TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_ED25519, TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY0, TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY1] */
   trunnel_assert(written <= avail);
   if (avail - written < 1)
     goto truncated;
@@ -451,11 +452,11 @@ trn_cell_introduce1_parse_into(trn_cell_introduce1_t *obj, const uint8_t *input,
   memcpy(obj->legacy_key_id, ptr, TRUNNEL_SHA1_LEN);
   remaining -= TRUNNEL_SHA1_LEN; ptr += TRUNNEL_SHA1_LEN;
 
-  /* Parse u8 auth_key_type IN [0, 1, 2] */
+  /* Parse u8 auth_key_type IN [TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_ED25519, TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY0, TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY1] */
   CHECK_REMAINING(1, truncated);
   obj->auth_key_type = (trunnel_get_uint8(ptr));
   remaining -= 1; ptr += 1;
-  if (! (obj->auth_key_type == 0 || obj->auth_key_type == 1 || obj->auth_key_type == 2))
+  if (! (obj->auth_key_type == TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_ED25519 || obj->auth_key_type == TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY0 || obj->auth_key_type == TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY1))
     goto fail;
 
   /* Parse u16 auth_key_len */

src/trunnel/hs/cell_introduce1.h

@@ -15,6 +15,9 @@ struct link_specifier_st;
 #define TRUNNEL_HS_INTRO_ACK_STATUS_SUCCESS 0
 #define TRUNNEL_HS_INTRO_ACK_STATUS_UNKNOWN_ID 1
 #define TRUNNEL_HS_INTRO_ACK_STATUS_BAD_FORMAT 2
+#define TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY0 0
+#define TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY1 1
+#define TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_ED25519 2
 #if !defined(TRUNNEL_OPAQUE) && !defined(TRUNNEL_OPAQUE_TRN_CELL_INTRODUCE1)
 struct trn_cell_introduce1_st {
   uint8_t legacy_key_id[TRUNNEL_SHA1_LEN];

src/trunnel/hs/cell_introduce1.trunnel

@@ -17,13 +17,20 @@ const TRUNNEL_HS_INTRO_ACK_STATUS_SUCCESS    = 0x0000;
 const TRUNNEL_HS_INTRO_ACK_STATUS_UNKNOWN_ID = 0x0001;
 const TRUNNEL_HS_INTRO_ACK_STATUS_BAD_FORMAT = 0x0002;
 
+/* Authentication key type. */
+const TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY0 = 0x00;
+const TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY1 = 0x01;
+const TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_ED25519 = 0x02;
+
 /* INTRODUCE1 payload. See details in section 3.2.1. */
 struct trn_cell_introduce1 {
   /* Always zeroed. MUST be checked explicitly by the caller. */
   u8 legacy_key_id[TRUNNEL_SHA1_LEN];
 
   /* Authentication key material. */
-  u8 auth_key_type IN [0x00, 0x01, 0x02];
+  u8 auth_key_type IN [TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY0,
+                       TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_LEGACY1,
+                       TRUNNEL_HS_INTRO_AUTH_KEY_TYPE_ED25519];
   u16 auth_key_len;
   u8 auth_key[auth_key_len];