From: Vincent Breitmoser <look@my.amazin.horse>

Date: Thu, 13 Jun 2019 21:27:42 +0200

Subject: gpg: allow import of previously known keys, even without UIDs

* g10/import.c (import_one): Accept an incoming OpenPGP certificate that

has no user id, as long as we already have a local variant of the cert

that matches the primary key.

--

This fixes two of the three broken tests in import-incomplete.scm.

GnuPG-Bug-id: 4393

Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>

---

 g10/import.c | 44 +++++++++++---------------------------------

 1 file changed, 11 insertions(+), 33 deletions(-)

diff --git a/g10/import.c b/g10/import.c

index 5d3162c..f9acf95 100644

--- a/g10/import.c

+++ b/g10/import.c

@@ -1788,7 +1788,6 @@ import_one_real (ctrl_t ctrl,

   size_t an;

   char pkstrbuf[PUBKEY_STRING_SIZE];

   int merge_keys_done = 0;

-  int any_filter = 0;

   KEYDB_HANDLE hd = NULL;

   if (r_valid)

@@ -1825,14 +1824,6 @@ import_one_real (ctrl_t ctrl,

       log_printf ("\n");

     }

-

-  if (!uidnode )

-    {

-      if (!silent)

-        log_error( _("key %s: no user ID\n"), keystr_from_pk(pk));

-      return 0;

-    }

-

   if (screener && screener (keyblock, screener_arg))

     {

       log_error (_("key %s: %s\n"), keystr_from_pk (pk),

@@ -1907,17 +1898,10 @@ import_one_real (ctrl_t ctrl,

 	  }

     }

-  if (!delete_inv_parts (ctrl, keyblock, keyid, options ) )

-    {

-      if (!silent)

-        {

-          log_error( _("key %s: no valid user IDs\n"), keystr_from_pk(pk));

-          if (!opt.quiet )

-            log_info(_("this may be caused by a missing self-signature\n"));

-        }

-      stats->no_user_id++;

-      return 0;

-    }

+  /* Delete invalid parts, and note if we have any valid ones left.

+   * We will later abort import if this key is new but contains

+   * no valid uids.  */

+  delete_inv_parts (ctrl, keyblock, keyid, options);

   /* Get rid of deleted nodes.  */

   commit_kbnode (&keyblock);

@@ -1927,24 +1911,11 @@ import_one_real (ctrl_t ctrl,

     {

       apply_keep_uid_filter (ctrl, keyblock, import_filter.keep_uid);

       commit_kbnode (&keyblock);

-      any_filter = 1;

     }

   if (import_filter.drop_sig)

     {

       apply_drop_sig_filter (ctrl, keyblock, import_filter.drop_sig);

       commit_kbnode (&keyblock);

-      any_filter = 1;

-    }

-

-  /* If we ran any filter we need to check that at least one user id

-   * is left in the keyring.  Note that we do not use log_error in

-   * this case. */

-  if (any_filter && !any_uid_left (keyblock))

-    {

-      if (!opt.quiet )

-        log_info ( _("key %s: no valid user IDs\n"), keystr_from_pk (pk));

-      stats->no_user_id++;

-      return 0;

     }

   /* The keyblock is valid and ready for real import.  */

@@ -2002,6 +1973,13 @@ import_one_real (ctrl_t ctrl,

       err = 0;

       stats->skipped_new_keys++;

     }

+  else if (err && !any_uid_left (keyblock))

+    {

+      if (!silent)

+        log_info( _("key %s: new key but contains no user ID - skipped\n"), keystr(keyid));

+      err = 0;

+      stats->no_user_id++;

+    }

   else if (err)  /* Insert this key. */

     {

       /* Note: ERR can only be NO_PUBKEY or UNUSABLE_PUBKEY.  */