wks: Send only the newest UID to the server.

* tools/wks-util.c (list_key_status_cb): Rename to key_status_cb.
(wks_filter_uid): New.
(wks_list_key): Allow FPR to be NULL.  Return an error if no
fingerprint was found.
* tools/gpg-wks-server.c (process_new_key)
(check_and_publish): Remove now useless extra check for FPR.
* tools/gpg-wks-client.c (command_check): Ditto.
(command_send): Filter out the newest uid.
--

This fixes the case of having several userids with all the the same
mailbox.  Now we use the latest user id created.  This patch is also a
prerequisite to automatically create a new user id for providers with
the mailbox-only policy.

Signed-off-by: Werner Koch <wk@gnupg.org>

tools/gpg-wks-client.c

@@ -644,10 +644,9 @@ command_check (char *userid)
 
   /* Look closer at the key.  */
   err = wks_list_key (key, &fpr, &mboxes);
-  if (err || !fpr)
+  if (err)
     {
-      log_error ("error parsing key: %s\n",
+      log_error ("error parsing key: %s\n", gpg_strerror (err));
-                 err? gpg_strerror (err) : "no fingerprint found");
       err = gpg_error (GPG_ERR_NO_PUBKEY);
       goto leave;
     }
@@ -700,6 +699,9 @@ command_send (const char *fingerprint, const char *userid)
   int no_encrypt = 0;
   int posteo_hack = 0;
   const char *domain;
+  uidinfo_list_t uidlist = NULL;
+  uidinfo_list_t uid, thisuid;
+  time_t thistime;
 
   memset (&policy, 0, sizeof policy);
 
@@ -769,6 +771,57 @@ command_send (const char *fingerprint, const char *userid)
   if (policy.auth_submit)
     log_info ("no confirmation required for '%s'\n", addrspec);
 
+  /* In case the key has several uids with the same addr-spec we will
+   * use the newest one.  */
+  err = wks_list_key (key, NULL, &uidlist);
+  if (err)
+    {
+      log_error ("error parsing key: %s\n",gpg_strerror (err));
+      err = gpg_error (GPG_ERR_NO_PUBKEY);
+      goto leave;
+    }
+  thistime = 0;
+  thisuid = NULL;
+  for (uid = uidlist; uid; uid = uid->next)
+    {
+      if (!uid->mbox)
+        continue; /* Should not happen anyway.  */
+      if (uid->created > thistime)
+        {
+          thistime = uid->created;
+          thisuid = uid;
+        }
+    }
+  if (!thisuid)
+    thisuid = uid;  /* This is the case for a missing timestamp.  */
+  if (opt.verbose)
+    log_info ("submitting key with user id '%s'\n", thisuid->uid);
+
+  /* If we have more than one user id we need to filter the key to
+   * include only THISUID.  */
+  if (uidlist->next)
+    {
+      estream_t newkey;
+
+      es_rewind (key);
+      err = wks_filter_uid (&newkey, key, thisuid->uid);
+      if (err)
+        {
+          log_error ("error filtering key: %s\n", gpg_strerror (err));
+          err = gpg_error (GPG_ERR_NO_PUBKEY);
+          goto leave;
+        }
+      es_fclose (key);
+      key = newkey;
+    }
+
+  if (policy.mailbox_only
+      && ascii_strcasecmp (userid, addrspec))
+    {
+      log_info ("Warning: policy requires 'mailbox-only'"
+                " - creating new user id'\n");
+    }
+
   /* Hack to support posteo but let them disable this by setting the
    * new policy-version flag.  */
   if (policy.protocol_version < 3
@@ -885,6 +938,7 @@ command_send (const char *fingerprint, const char *userid)
  leave:
   mime_maker_release (mime);
   xfree (submission_to);
+  free_uidinfo_list (uidlist);
   es_fclose (keyenc);
   es_fclose (key);
   xfree (addrspec);

tools/gpg-wks-server.c

@@ -1105,12 +1105,7 @@ process_new_key (server_ctx_t ctx, estream_t key)
   err = wks_list_key (key, &ctx->fpr, &ctx->mboxes);
   if (err)
     goto leave;
-  if (!ctx->fpr)
+  log_assert (ctx->fpr);
-    {
-      log_error ("error parsing key (no fingerprint)\n");
-      err = gpg_error (GPG_ERR_NO_PUBKEY);
-      goto leave;
-    }
   log_info ("fingerprint: %s\n", ctx->fpr);
   for (sl = ctx->mboxes; sl; sl = sl->next)
     {
@@ -1358,12 +1353,7 @@ check_and_publish (server_ctx_t ctx, const char *address, const char *nonce)
   err = wks_list_key (key, &ctx->fpr, &ctx->mboxes);
   if (err)
     goto leave;
-  if (!ctx->fpr)
+  log_assert (ctx->fpr);
-    {
-      log_error ("error parsing key (no fingerprint)\n");
-      err = gpg_error (GPG_ERR_NO_PUBKEY);
-      goto leave;
-    }
   log_info ("fingerprint: %s\n", ctx->fpr);
   for (sl = ctx->mboxes; sl; sl = sl->next)
     if (sl->mbox)

tools/gpg-wks.h

@@ -87,6 +87,8 @@ void wks_write_status (int no, const char *format, ...) GPGRT_ATTR_PRINTF(2,3);
 void free_uidinfo_list (uidinfo_list_t list);
 gpg_error_t wks_list_key (estream_t key, char **r_fpr,
                           uidinfo_list_t *r_mboxes);
+gpg_error_t wks_filter_uid (estream_t *r_newkey, estream_t key,
+                            const char *uid);
 gpg_error_t wks_send_mime (mime_maker_t mime);
 gpg_error_t wks_parse_policy (policy_flags_t flags, estream_t stream,
                               int ignore_unknown);

tools/wks-util.c

@@ -133,9 +133,9 @@ free_uidinfo_list (uidinfo_list_t list)
 
 
 
-/* Helper for wks_list_key.  */
+/* Helper for wks_list_key and wks_filter_uid.  */
 static void
-list_key_status_cb (void *opaque, const char *keyword, char *args)
+key_status_cb (void *opaque, const char *keyword, char *args)
 {
   (void)opaque;
 
@@ -146,7 +146,8 @@ list_key_status_cb (void *opaque, const char *keyword, char *args)
 
 /* Run gpg on KEY and store the primary fingerprint at R_FPR and the
  * list of mailboxes at R_MBOXES.  Returns 0 on success; on error NULL
- * is stored at R_FPR and R_MBOXES and an error code is returned.  */
+ * is stored at R_FPR and R_MBOXES and an error code is returned.
+ * R_FPR may be NULL if the fingerprint is not needed.  */
 gpg_error_t
 wks_list_key (estream_t key, char **r_fpr, uidinfo_list_t *r_mboxes)
 {
@@ -164,7 +165,8 @@ wks_list_key (estream_t key, char **r_fpr, uidinfo_list_t *r_mboxes)
   char *fpr = NULL;
   uidinfo_list_t mboxes = NULL;
 
-  *r_fpr = NULL;
+  if (r_fpr)
+    *r_fpr = NULL;
   *r_mboxes = NULL;
 
   /* Open a memory stream.  */
@@ -200,7 +202,7 @@ wks_list_key (estream_t key, char **r_fpr, uidinfo_list_t *r_mboxes)
     }
   err = gnupg_exec_tool_stream (opt.gpg_program, argv, key,
                                 NULL, listing,
-                                list_key_status_cb, NULL);
+                                key_status_cb, NULL);
   if (err)
     {
       log_error ("import failed: %s\n", gpg_strerror (err));
@@ -289,8 +291,17 @@ wks_list_key (estream_t key, char **r_fpr, uidinfo_list_t *r_mboxes)
       goto leave;
     }
 
-  *r_fpr = fpr;
+  if (!fpr)
-  fpr = NULL;
+    {
+      err = gpg_error (GPG_ERR_NO_PUBKEY);
+      goto leave;
+    }
+
+  if (r_fpr)
+    {
+      *r_fpr = fpr;
+      fpr = NULL;
+    }
   *r_mboxes = mboxes;
   mboxes = NULL;
 
@@ -305,6 +316,85 @@ wks_list_key (estream_t key, char **r_fpr, uidinfo_list_t *r_mboxes)
 }
 
 
+/* Run gpg as a filter on KEY and write the output to a new stream
+ * stored at R_NEWKEY.  The new key will containn only the user id
+ * UID.  Returns 0 on success.  Only one key is expected in KEY. */
+gpg_error_t
+wks_filter_uid (estream_t *r_newkey, estream_t key, const char *uid)
+{
+  gpg_error_t err;
+  ccparray_t ccp;
+  const char **argv = NULL;
+  estream_t newkey;
+  char *filterexp = NULL;
+
+  *r_newkey = NULL;
+
+  /* Open a memory stream.  */
+  newkey = es_fopenmem (0, "w+b");
+  if (!newkey)
+    {
+      err = gpg_error_from_syserror ();
+      log_error ("error allocating memory buffer: %s\n", gpg_strerror (err));
+      return err;
+    }
+
+  /* Prefix the key with the MIME content type.  */
+  es_fputs ("Content-Type: application/pgp-keys\n"
+            "\n", newkey);
+
+  filterexp = es_bsprintf ("keep-uid=uid=%s", uid);
+  if (!filterexp)
+    {
+      err = gpg_error_from_syserror ();
+      log_error ("error allocating memory buffer: %s\n", gpg_strerror (err));
+      goto leave;
+    }
+
+  ccparray_init (&ccp, 0);
+
+  ccparray_put (&ccp, "--no-options");
+  if (!opt.verbose)
+    ccparray_put (&ccp, "--quiet");
+  else if (opt.verbose > 1)
+    ccparray_put (&ccp, "--verbose");
+  ccparray_put (&ccp, "--batch");
+  ccparray_put (&ccp, "--status-fd=2");
+  ccparray_put (&ccp, "--always-trust");
+  ccparray_put (&ccp, "--armor");
+  ccparray_put (&ccp, "--import-options=import-export");
+  ccparray_put (&ccp, "--import-filter");
+  ccparray_put (&ccp, filterexp);
+  ccparray_put (&ccp, "--import");
+
+  ccparray_put (&ccp, NULL);
+  argv = ccparray_get (&ccp, NULL);
+  if (!argv)
+    {
+      err = gpg_error_from_syserror ();
+      goto leave;
+    }
+  err = gnupg_exec_tool_stream (opt.gpg_program, argv, key,
+                                NULL, newkey,
+                                key_status_cb, NULL);
+  if (err)
+    {
+      log_error ("import/export failed: %s\n", gpg_strerror (err));
+      goto leave;
+    }
+
+  es_rewind (newkey);
+  *r_newkey = newkey;
+  newkey = NULL;
+
+ leave:
+  xfree (filterexp);
+  xfree (argv);
+  es_fclose (newkey);
+  return err;
+}
+
+
 /* Helper to write mail to the output(s).  */
 gpg_error_t
 wks_send_mime (mime_maker_t mime)