Add a unit test for ed25519 identity parsing in microdescriptors

This test makes sure that we parse ed25519 identities to get the
correct data from them.  It also tests:

   * That a microdescriptor may not have two ed25519 identities.
   * That a microdescriptor may not have an ed25519 identity that is
     not a valid base64-encoded ed25519 key.
   * That a microdescriptor may have an unrecognized identity type.

It will help test the refactoring of ticket31675.

1 files changed, 76 insertions, 0 deletions

diff --git a/src/test/test_microdesc.c b/src/test/test_microdesc.c
index ad211c7ea8..804e6c546a 100644
--- a/src/test/test_microdesc.c
+++ b/src/test/test_microdesc.c
@@ -21,6 +21,7 @@
 #include "feature/nodelist/routerstatus_st.h"
 
 #include "test/test.h"
+#include "test/log_test_helpers.h"
 
 #ifdef HAVE_SYS_STAT_H
 #include <sys/stat.h>
@@ -770,6 +771,80 @@ test_md_parse(void *arg)
   tor_free(mem_op_hex_tmp);
 }
 
+static void
+test_md_parse_id_ed25519(void *arg)
+{
+  (void)arg;
+
+  /* A correct MD with an ed25519 ID ... and an unspecified ID type,
+   * which is permitted. */
+  const char GOOD_MD[] =
+    "onion-key\n"
+    "-----BEGIN RSA PUBLIC KEY-----\n"
+    "MIGJAoGBAM7uUtq5F6h63QNYIvC+4NcWaD0DjtnrOORZMkdpJhinXUOwce3cD5Dj\n"
+    "sgdN1wJpWpTQMXJ2DssfSgmOVXETP7qJuZyRprxalQhaEATMDNJA/66Ml1jSO9mZ\n"
+    "+8Xb7m/4q778lNtkSbsvMaYD2Dq6k2QQ3kMhr9z8oUtX0XA23+pfAgMBAAE=\n"
+    "-----END RSA PUBLIC KEY-----\n"
+    "id ed25519 VGhpcyBpc24ndCBhY3R1YWxseSBhIHB1YmxpYyBrZXk\n"
+    "id wumpus dodecahedron\n";
+
+  smartlist_t *mds = NULL;
+  const microdesc_t *md;
+
+  mds = microdescs_parse_from_string(GOOD_MD,
+                                     NULL, 1, SAVED_NOWHERE, NULL);
+  tt_assert(mds);
+  tt_int_op(smartlist_len(mds), OP_EQ, 1);
+  md = smartlist_get(mds, 0);
+  tt_mem_op(md->ed25519_identity_pkey, OP_EQ,
+            "This isn't actually a public key", ED25519_PUBKEY_LEN);
+  SMARTLIST_FOREACH(mds, microdesc_t *, m, microdesc_free(m));
+  smartlist_free(mds);
+
+  /* As above, but ed25519 ID key appears twice. */
+  const char DUPLICATE_KEY[] =
+    "onion-key\n"
+    "-----BEGIN RSA PUBLIC KEY-----\n"
+    "MIGJAoGBAM7uUtq5F6h63QNYIvC+4NcWaD0DjtnrOORZMkdpJhinXUOwce3cD5Dj\n"
+    "sgdN1wJpWpTQMXJ2DssfSgmOVXETP7qJuZyRprxalQhaEATMDNJA/66Ml1jSO9mZ\n"
+    "+8Xb7m/4q778lNtkSbsvMaYD2Dq6k2QQ3kMhr9z8oUtX0XA23+pfAgMBAAE=\n"
+    "-----END RSA PUBLIC KEY-----\n"
+    "id ed25519 VGhpcyBpc24ndCBhY3R1YWxseSBhIHB1YmxpYyBrZXk\n"
+    "id ed25519 VGhpcyBpc24ndCBhY3R1YWxseSBhIHB1YmxpYyBrZXk\n";
+
+  setup_capture_of_logs(LOG_WARN);
+  mds = microdescs_parse_from_string(DUPLICATE_KEY,
+                                     NULL, 1, SAVED_NOWHERE, NULL);
+  tt_assert(mds);
+  tt_int_op(smartlist_len(mds), OP_EQ, 0); // no entries.
+  expect_single_log_msg_containing("Extra ed25519 key");
+  mock_clean_saved_logs();
+  smartlist_free(mds);
+
+  /* As above, but ed25519 ID key is invalid. */
+  const char BOGUS_KEY[] =
+    "onion-key\n"
+    "-----BEGIN RSA PUBLIC KEY-----\n"
+    "MIGJAoGBAM7uUtq5F6h63QNYIvC+4NcWaD0DjtnrOORZMkdpJhinXUOwce3cD5Dj\n"
+    "sgdN1wJpWpTQMXJ2DssfSgmOVXETP7qJuZyRprxalQhaEATMDNJA/66Ml1jSO9mZ\n"
+    "+8Xb7m/4q778lNtkSbsvMaYD2Dq6k2QQ3kMhr9z8oUtX0XA23+pfAgMBAAE=\n"
+    "-----END RSA PUBLIC KEY-----\n"
+    "id ed25519 VGhpcyBpc24ndCBhY3R1YWxseSBhIHB1YmxpYyZZZZZZZZZZZ\n";
+
+  mds = microdescs_parse_from_string(BOGUS_KEY,
+                                     NULL, 1, SAVED_NOWHERE, NULL);
+  tt_assert(mds);
+  tt_int_op(smartlist_len(mds), OP_EQ, 0); // no entries.
+  expect_single_log_msg_containing("Bogus ed25519 key");
+
+ done:
+  if (mds) {
+    SMARTLIST_FOREACH(mds, microdesc_t *, m, microdesc_free(m));
+    smartlist_free(mds);
+  }
+  teardown_capture_of_logs();
+}
+
 static int mock_rgsbd_called = 0;
 static routerstatus_t *mock_rgsbd_val_a = NULL;
 static routerstatus_t *mock_rgsbd_val_b = NULL;
@@ -903,6 +978,7 @@ struct testcase_t microdesc_tests[] = {
   { "broken_cache", test_md_cache_broken, TT_FORK, NULL, NULL },
   { "generate", test_md_generate, 0, NULL, NULL },
   { "parse", test_md_parse, 0, NULL, NULL },
+  { "parse_id_ed25519", test_md_parse_id_ed25519, 0, NULL, NULL },
   { "reject_cache", test_md_reject_cache, TT_FORK, NULL, NULL },
   { "corrupt_desc", test_md_corrupt_desc, TT_FORK, NULL, NULL },
   END_OF_TESTCASES