gpg: Do not pre-check keys given on the command line.

* g10/keydb.h (PK_LIST_ENCRYPT_TO, PK_LIST_HIDDEN, PK_LIST_CONFIG)
(PK_LIST_SHIFT): New.
* g10/pkclist.c (build_pk_list): Use them here.
* g10/gpg.c (check_user_ids, main): Ditto.

* g10/gpg.c (main): Set PK_LIST_CONFIG for REMUSR and LOCUSR.
(check_user_ids): Skip check for command line specified options.
--

If a key has been given on the command line and it has not been
given by one of the encrypt-to options, we now skip the checks.  The
reason is that the actual key selection code does its own checks and
provides proper status message to the caller to detect the wrong keys.
Without this we would break most frontends because they expect for
example STATUS_INV_RECP.

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

NEWS

@@ -19,8 +19,8 @@ Noteworthy changes in version 2.1.10 (unreleased)
  * gpg: New option --only-sign-text-ids to exclude photo IDs from key
    signing.
 
- * gpg: Check for ambigious or non-matching key specification of
+ * gpg: Check for ambigious or non-matching key specification in the
-   command line options.
+   config file or given to --encrypt-to.
 
  * gpg: Show the used card reader with --card-status.
 

g10/gpg.c

@@ -2116,7 +2116,12 @@ check_user_ids (strlist_t *sp,
 
   KEYDB_HANDLE hd = NULL;
 
-  if (! s)
+  /* A quick check to avoid allocating a new strlist if we can skip
+     all keys.  Handles also the case of !SP.  See below for details.  */
+  for (t = s; t && (!(t->flags & PK_LIST_CONFIG)
+                    && !(t->flags & PK_LIST_ENCRYPT_TO)); t = t->next)
+    ;
+  if (!t)
     return 0;
 
   for (t = s; t; t = t->next)
@@ -2131,8 +2136,19 @@ check_user_ids (strlist_t *sp,
       /* We also potentially need a ! at the end.  */
       char fingerprint[2 * MAX_FINGERPRINT_LEN + 1 + 1];
 
+      /* If the key has been given on the command line and it has not
+         been given by one of the encrypt-to options, we skip the
+         checks.  The reason is that the actual key selection code
+         does its own checks and provides proper status message to the
+         caller to detect the wrong keys.  */
+      if (!(t->flags & PK_LIST_CONFIG) && !(t->flags & PK_LIST_ENCRYPT_TO))
+        {
+          add_to_strlist (&s2, t->d);
+          s2->flags = t->flags;
+          continue;
+        }
 
-      switch (t->flags >> 2)
+      switch (t->flags >> PK_LIST_SHIFT)
         {
         case oDefaultKey: option = "--default-key"; break;
         case oEncryptTo: option = "--encrypt-to"; break;
@@ -2141,7 +2157,8 @@ check_user_ids (strlist_t *sp,
         case oRecipient: option = "--recipient"; break;
         case oHiddenRecipient: option = "--hidden-recipient"; break;
         case oLocalUser: option = "--local-user"; break;
-        default: log_bug ("Unsupport option: %d\n", t->flags >> 2);
+        default:
+          log_bug ("Unsupport option: %d\n", (t->flags >> PK_LIST_SHIFT));
         }
 
       if (DBG_LOOKUP)
@@ -2338,7 +2355,9 @@ main (int argc, char **argv)
     const char *fname;
     char *username;
     int may_coredump;
-    strlist_t sl, remusr= NULL, locusr=NULL;
+    strlist_t sl;
+    strlist_t remusr = NULL;
+    strlist_t locusr = NULL;
     strlist_t nrings = NULL;
     armor_filter_context_t *afx = NULL;
     int detached_sig = 0;
@@ -2828,7 +2847,7 @@ main (int argc, char **argv)
 #endif /*!NO_TRUST_MODELS*/
 	  case oDefaultKey:
             sl = add_to_strlist (&opt.def_secret_key, pargs.r.ret_str);
-            sl->flags = (pargs.r_opt << 2);
+            sl->flags = (pargs.r_opt << PK_LIST_SHIFT);
             break;
 	  case oDefRecipient:
             if( *pargs.r.ret_str )
@@ -3020,23 +3039,32 @@ main (int argc, char **argv)
 	  case oNoEncryptTo: opt.no_encrypt_to = 1; break;
 	  case oEncryptTo: /* store the recipient in the second list */
 	    sl = add_to_strlist2( &remusr, pargs.r.ret_str, utf8_strings );
-	    sl->flags = (pargs.r_opt << 2) | 1;
+	    sl->flags = ((pargs.r_opt << PK_LIST_SHIFT) | PK_LIST_ENCRYPT_TO);
+            if (configfp)
+              sl->flags |= PK_LIST_CONFIG;
 	    break;
 	  case oHiddenEncryptTo: /* store the recipient in the second list */
 	    sl = add_to_strlist2( &remusr, pargs.r.ret_str, utf8_strings );
-	    sl->flags = (pargs.r_opt << 2) | 1|2;
+	    sl->flags = ((pargs.r_opt << PK_LIST_SHIFT)
+                         | PK_LIST_ENCRYPT_TO|PK_LIST_HIDDEN);
+            if (configfp)
+              sl->flags |= PK_LIST_CONFIG;
 	    break;
           case oEncryptToDefaultKey:
             opt.encrypt_to_default_key = 1;
             break;
 	  case oRecipient: /* store the recipient */
 	    sl = add_to_strlist2( &remusr, pargs.r.ret_str, utf8_strings );
-	    sl->flags = (pargs.r_opt << 2);
+	    sl->flags = (pargs.r_opt << PK_LIST_SHIFT);
+            if (configfp)
+              sl->flags |= PK_LIST_CONFIG;
             any_explicit_recipient = 1;
 	    break;
 	  case oHiddenRecipient: /* store the recipient with a flag */
 	    sl = add_to_strlist2( &remusr, pargs.r.ret_str, utf8_strings );
-	    sl->flags = (pargs.r_opt << 2) | 2;
+	    sl->flags = ((pargs.r_opt << PK_LIST_SHIFT) | PK_LIST_HIDDEN);
+            if (configfp)
+              sl->flags |= PK_LIST_CONFIG;
             any_explicit_recipient = 1;
 	    break;
 
@@ -3080,7 +3108,9 @@ main (int argc, char **argv)
 	  case oNoAskCertLevel: opt.ask_cert_level = 0; break;
 	  case oLocalUser: /* store the local users */
 	    sl = add_to_strlist2( &locusr, pargs.r.ret_str, utf8_strings );
-            sl->flags = (pargs.r_opt << 2);
+            sl->flags = (pargs.r_opt << PK_LIST_SHIFT);
+            if (configfp)
+              sl->flags |= PK_LIST_CONFIG;
 	    break;
 	  case oCompress:
 	    /* this is the -z command line option */
@@ -4010,7 +4040,8 @@ main (int argc, char **argv)
           if (default_key)
             {
               sl = add_to_strlist2 (&remusr, default_key, utf8_strings);
-              sl->flags = (oEncryptToDefaultKey << 2) | 1;
+              sl->flags = ((oEncryptToDefaultKey << PK_LIST_SHIFT)
+                           | PK_LIST_ENCRYPT_TO);
             }
           else if (have_def_secret_key)
             log_info (_("option '%s' given, but no valid default keys given\n"),

g10/keydb.h

@@ -69,6 +69,14 @@ enum resource_type {
 };
 
 
+/* Bit flags used with build_pk_list.  */
+#define PK_LIST_ENCRYPT_TO 1   /* This is an encrypt-to recipient.  */
+#define PK_LIST_HIDDEN     2   /* This is a hidden recipient.       */
+#define PK_LIST_CONFIG     4   /* Specified via config file.        */
+/* To store private data in the flags they must be left shifted by
+   this value.  */
+#define PK_LIST_SHIFT      3
+
 /****************
  * A data structure to hold information about the external position
  * of a keyblock.

g10/pkclist.c

@@ -890,8 +890,8 @@ find_and_check_key (ctrl_t ctrl, const char *name, unsigned int use,
    value but not very useful.  Group expansion is done on these names;
    they may be in any of the user Id formats we can handle.  The flags
    bits for each string in the string list are used for:
-     Bit 0: This is an encrypt-to recipient.
+     Bit 0 (PK_LIST_ENCRYPT_TO): This is an encrypt-to recipient.
-     Bit 1: This is a hidden recipient.
+     Bit 1 (PK_LIST_HIDDEN)    : This is a hidden recipient.
 
    USE is the desired use for the key - usually PUBKEY_USAGE_ENC.
 
@@ -921,7 +921,7 @@ build_pk_list (ctrl_t ctrl,
    * list of the encrypt-to ones (we always trust them). */
   for ( rov = remusr; rov; rov = rov->next )
     {
-      if ( !(rov->flags & 1) )
+      if ( !(rov->flags & PK_LIST_ENCRYPT_TO) )
         {
           /* This is a regular recipient; i.e. not an encrypt-to
              one. */
@@ -929,7 +929,7 @@ build_pk_list (ctrl_t ctrl,
 
           /* Hidden recipients are not allowed while in PGP mode,
              issue a warning and switch into GnuPG mode. */
-          if ((rov->flags&2) && (PGP6 || PGP7 || PGP8))
+          if ((rov->flags & PK_LIST_HIDDEN) && (PGP6 || PGP7 || PGP8))
             {
               log_info(_("you may not use %s while in %s mode\n"),
                        "--hidden-recipient",
@@ -973,13 +973,13 @@ build_pk_list (ctrl_t ctrl,
                   r = xmalloc( sizeof *r );
                   r->pk = pk; pk = NULL;
                   r->next = pk_list;
-                  r->flags = (rov->flags&2)?1:0;
+                  r->flags = (rov->flags&PK_LIST_HIDDEN)?1:0;
                   pk_list = r;
 
                   /* Hidden encrypt-to recipients are not allowed while
                      in PGP mode, issue a warning and switch into
                      GnuPG mode. */
-                  if ((r->flags&1) && (PGP6 || PGP7 || PGP8))
+                  if ((r->flags&PK_LIST_ENCRYPT_TO) && (PGP6 || PGP7 || PGP8))
                     {
                       log_info(_("you may not use %s while in %s mode\n"),
                                "--hidden-encrypt-to",
@@ -1196,10 +1196,11 @@ build_pk_list (ctrl_t ctrl,
       any_recipients = 0;
       for (; remusr; remusr = remusr->next )
         {
-          if ( (remusr->flags & 1) )
+          if ( (remusr->flags & PK_LIST_ENCRYPT_TO) )
             continue; /* encrypt-to keys are already handled. */
 
-          rc = find_and_check_key (ctrl, remusr->d, use, !!(remusr->flags&2),
+          rc = find_and_check_key (ctrl, remusr->d, use,
+                                   !!(remusr->flags&PK_LIST_HIDDEN),
                                    &pk_list);
           if (rc)
             goto fail;