gpg: New command --quick-tsign-key.

* g10/gpg.c (aQuickTSignKey): New.
(opts): Add new command.
(main): Parse args for it.
* g10/keyedit.c: Include mbox-util.h.
(parse_trustsig_string): New.
(sign_uids): Add arg trustsig for use in quick mode.
(keyedit_quick_sign): Also add arg trustsig and print a diagnostic on
error.

NEWS

@@ -4,10 +4,12 @@ Noteworthy changes in version 2.5.6 (unreleased)
   * gpg: Add a flag to the filter expressions for left anchored
     substring match.  [rGc12b7d047e]
 
-  * gpg: Fix double free of internal data.  [T7547]
-
   * gpg: New list option "show-trustsig" to avoid resorting to colon
-    mode for this info.
+    mode for this info.  [rG41d6ae8f41]
+
+  * gpg: New command --quick-tsign-key to create a trust signature.
+
+  * gpg: Fix double free of internal data.  [T7547]
 
   * gpgsm: Extend --learn-card by an optional s/n argument.  [T7379]
 

doc/gpg.texi

@@ -1137,8 +1137,10 @@ from @option{--edit-key}.
 
 @item --quick-sign-key @var{fpr} [@var{names}]
 @itemx --quick-lsign-key @var{fpr} [@var{names}]
+@itemx --quick-tsign-key @var{fpr} @var{trustspec} [@var{names}]
 @opindex quick-sign-key
 @opindex quick-lsign-key
+@opindex quick-tsign-key
 Directly sign a key from the passphrase without any further user
 interaction.  The @var{fpr} must be the verified primary fingerprint
 of a key in the local keyring. If no @var{names} are given, all
@@ -1153,6 +1155,17 @@ non-exportable.  If such a non-exportable signature already exists the
 you need to update an existing signature, for example to add or change
 notation data, you need to use the option @option{--force-sign-key}.
 
+The command @option{--quick-tsign-key} creates a trust signature using
+the information from the @var{trustspec} string.  The @var{trustspec}
+uses the format [T=]@var{dept},@var{value}[,@var{domain}].  @var{depth}
+is the length of the trust chain in the range 0 (identical to a
+standard key signature) to 255 (ridiculous long trust chain); the most
+common lengths for trust signatures are 1 and 2.  @var{value} is
+either "f" or "full" which are mapped to a value of 120 or "m" or
+"marginal" which are mapped to a value of 60.  The allowed range is 0
+to 255 but it is highly suggested to use only 60 or 120.  @var{domain}
+is optional and a plain domain name like "example.org".
+
 This command uses reasonable defaults and thus does not provide the
 full flexibility of the "sign" subcommand from @option{--edit-key}.
 Its intended use is to help unattended key signing by utilizing a list

g10/gpg.c

@@ -130,6 +130,7 @@ enum cmd_and_opt_values
     aLSignKey,
     aQuickSignKey,
     aQuickLSignKey,
+    aQuickTSignKey,
     aQuickRevSig,
     aQuickAddUid,
     aQuickAddKey,
@@ -529,6 +530,8 @@ static gpgrt_opt_t opts[] = {
               N_("quickly sign a key")),
   ARGPARSE_c (aQuickLSignKey, "quick-lsign-key",
               N_("quickly sign a key locally")),
+  ARGPARSE_c (aQuickTSignKey, "quick-tsign-key",
+              N_("quickly sign a key with a trust signature")),
   ARGPARSE_c (aQuickRevSig,   "quick-revoke-sig" ,
               N_("quickly revoke a key signature")),
   ARGPARSE_c (aSignKey,  "sign-key"   ,N_("sign a key")),
@@ -2734,6 +2737,7 @@ main (int argc, char **argv)
 	  case aSign:
 	  case aQuickSignKey:
 	  case aQuickLSignKey:
+	  case aQuickTSignKey:
 	  case aQuickRevSig:
 	  case aSignKey:
 	  case aLSignKey:
@@ -4715,7 +4719,25 @@ main (int argc, char **argv)
           sl = NULL;
           for( ; argc; argc--, argv++)
 	    append_to_strlist2 (&sl, *argv, utf8_strings);
-          keyedit_quick_sign (ctrl, fpr, sl, locusr, (cmd == aQuickLSignKey));
+          keyedit_quick_sign (ctrl, fpr, sl, locusr,
+                              NULL, (cmd == aQuickLSignKey));
+          free_strlist (sl);
+        }
+	break;
+
+      case aQuickTSignKey:
+        {
+          const char *fpr, *tsig;
+
+          if (argc < 2)
+            wrong_args ("--quick-tsign-key fingerprint"
+                        " depth,[m|f][,domain] [userids]");
+          fpr = *argv++; argc--;
+          tsig = *argv++; argc--;
+          sl = NULL;
+          for( ; argc; argc--, argv++)
+	    append_to_strlist2 (&sl, *argv, utf8_strings);
+          keyedit_quick_sign (ctrl, fpr, sl, locusr, tsig, 0);
           free_strlist (sl);
         }
 	break;

g10/keyedit.c

@@ -44,6 +44,7 @@
 #include "../common/ttyio.h"
 #include "../common/status.h"
 #include "../common/i18n.h"
+#include "../common/mbox-util.h"
 #include "keyserver-internal.h"
 #include "call-agent.h"
 #include "../common/host2net.h"
@@ -380,6 +381,92 @@ sign_mk_attrib (PKT_signature * sig, void *opaque)
 }
 
 
+/* Parse a trust signature specification string into the 3 return
+ * args.  Returns 0 on success or an errorcode.  Format for the string
+ * is
+ *  ['T=']<depth>,<value>[,<domain>]
+ * The optional prefix is just to allow c+p from the --check-sigs
+ * output.  The domain is optional, <depth> must be a value in the
+ * range 0 to 255, value may either be value in the same range or -
+ * preferred - 'm' or 'f'.
+ */
+static gpg_error_t
+parse_trustsig_string (const char *string,
+                       byte *trust_value, byte *trust_depth, char **regexp)
+{
+  gpg_error_t err = 0;
+  char **fields;
+  int nfields;
+  int along;
+  char *endp;
+
+  *trust_value = 0;
+  *trust_depth = 0;
+  *regexp = NULL;
+
+  if (!string)
+    return gpg_error (GPG_ERR_INV_ARG);
+
+  if (*string == 'T' && string[1] == '=')
+    string += 2;
+
+  fields = strtokenize (string, ",");
+  if (!fields)
+      return gpg_error_from_syserror ();
+
+  for (nfields=0; fields[nfields]; nfields++)
+    ;
+  if (nfields < 2 || nfields > 3)
+    {
+      err = gpg_error (GPG_ERR_SYNTAX);
+      goto leave;
+    }
+  along = strtol (fields[0], &endp, 10);
+  if (along < 0 || along > 255 || fields[0] == endp || *endp)
+    {
+      err = gpg_error (GPG_ERR_ERANGE);
+      goto leave;
+    }
+  *trust_depth = along;
+  if (!strcmp (fields[1], "m")|| !strcmp (fields[1], "marginal"))
+    along = 60;
+  else if (!strcmp (fields[1], "f")|| !strcmp (fields[1], "full"))
+    along = 120;
+  else
+    {
+      along = strtol (fields[1], &endp, 10);
+      if (along < 0 || along > 255 || fields[1] == endp || *endp)
+        {
+          err = gpg_error (GPG_ERR_ERANGE);
+          goto leave;
+        }
+    }
+  *trust_value = along;
+
+  if (nfields == 3)
+    {
+      if (!is_valid_domain_name (fields[2]))
+        err = gpg_error (GPG_ERR_NO_NAME);
+      else
+        {
+          *regexp = strconcat ("<[^>]+[@.]", fields[2], ">$", NULL);
+          if (!*regexp)
+            err = gpg_error_from_syserror ();
+        }
+    }
+
+ leave:
+  xfree (fields);
+  if (err && *regexp)
+    {
+      xfree (*regexp);
+      *regexp = NULL;
+    }
+  return err;
+}
+
+
+/* Interactive version of parse_trustsig_string.  */
 static void
 trustsig_prompt (byte * trust_value, byte * trust_depth, char **regexp)
 {
@@ -485,12 +572,13 @@ trustsig_prompt (byte * trust_value, byte * trust_depth, char **regexp)
  * is marked, all user ids will be signed; if some user_ids are marked
  * only those will be signed.  FLAGS are the SIGN_UIDS_* constants.
  * For example with SIGN_UIDS_QUICK the function won't ask the user
- * and use sensible defaults.
+ * and use sensible defaults.  TRUSTSIGSTR is only used if also
+ * SIGN_UIDS_TRUSTSIG is set.
  */
 static int
 sign_uids (ctrl_t ctrl, estream_t fp,
            kbnode_t keyblock, strlist_t locusr, unsigned int flags,
-           int *ret_modified)
+           const char *trustsigstr, int *ret_modified)
 {
   int rc = 0;
   SK_LIST sk_list = NULL;
@@ -498,9 +586,11 @@ sign_uids (ctrl_t ctrl, estream_t fp,
   PKT_public_key *pk = NULL;
   KBNODE node, uidnode;
   PKT_public_key *primary_pk = NULL;
+  char *trust_regexp = NULL;
   int select_all = (!count_selected_uids (keyblock)
                     || (flags & SIGN_UIDS_INTERACTIVE));
 
+
   /* Build a list of all signators.
    *
    * We use the CERT flag to request the primary which must always
@@ -516,7 +606,7 @@ sign_uids (ctrl_t ctrl, estream_t fp,
   for (sk_rover = sk_list; sk_rover; sk_rover = sk_rover->next)
     {
       u32 sk_keyid[2], pk_keyid[2];
-      char *p, *trust_regexp = NULL;
+      char *p;
       int class = 0, selfsig = 0;
       u32 duration = 0, timestamp = 0;
       byte trust_depth = 0, trust_value = 0;
@@ -917,9 +1007,21 @@ sign_uids (ctrl_t ctrl, estream_t fp,
 		}
 	    }
 
-	  if ((flags & SIGN_UIDS_TRUSTSIG) && !(flags & SIGN_UIDS_QUICK))
+	  if ((flags & SIGN_UIDS_TRUSTSIG))
+            {
+              xfree (trust_regexp);
+              trust_regexp = NULL;
+              if ((flags & SIGN_UIDS_QUICK))
+                {
+                  rc = parse_trustsig_string (trustsigstr, &trust_value,
+                                              &trust_depth, &trust_regexp);
+                  if (rc)
+                    goto leave;
+                }
+              else
                 trustsig_prompt (&trust_value, &trust_depth, &trust_regexp);
             }
+        }
 
       if (!(flags & SIGN_UIDS_QUICK))
         {
@@ -1065,6 +1167,8 @@ sign_uids (ctrl_t ctrl, estream_t fp,
     } /* End loop over signators.  */
 
  leave:
+  xfree (trust_regexp);
+  trust_regexp = NULL;
   release_sk_list (sk_list);
   return rc;
 }
@@ -1730,7 +1834,7 @@ keyedit_menu (ctrl_t ctrl, const char *username, strlist_t locusr,
 		break;
 	      }
 
-	    sign_uids (ctrl, NULL, keyblock, locusr, myflags, &modified);
+	    sign_uids (ctrl, NULL, keyblock, locusr, myflags, NULL, &modified);
 	  }
 	  break;
 
@@ -2910,10 +3014,12 @@ find_by_primary_fpr (ctrl_t ctrl, const char *fpr,
    key are signed using the default signing key.  If UIDS is an empty
    list all usable UIDs are signed, if it is not empty, only those
    user ids matching one of the entries of the list are signed.  With
-   LOCAL being true the signatures are marked as non-exportable.  */
+   LOCAL being true the signatures are marked as non-exportable.  If
+   TRUSTSIG is given a trust signature is created; see
+   parse_trustsig_string(). */
 void
 keyedit_quick_sign (ctrl_t ctrl, const char *fpr, strlist_t uids,
-                    strlist_t locusr, int local)
+                    strlist_t locusr, const char *trustsig, int local)
 {
   gpg_error_t err = 0;
   kbnode_t keyblock = NULL;
@@ -2929,6 +3035,20 @@ keyedit_quick_sign (ctrl_t ctrl, const char *fpr, strlist_t uids,
   check_trustdb_stale (ctrl);
 #endif
 
+  /* Do an early check on an arg for an immediate error message.  */
+  if (trustsig)
+    {
+      byte trust_depth, trust_value;
+      char *trust_regexp;
+      err = parse_trustsig_string (trustsig, &trust_value,
+                                   &trust_depth, &trust_regexp);
+      xfree (trust_regexp);
+      (void)trust_depth;
+      (void)trust_value;
+      if (err)
+        goto leave;
+    }
+
   /* We require a fingerprint because only this uniquely identifies a
      key and may thus be used to select a key for unattended key
      signing.  */
@@ -3036,10 +3156,14 @@ keyedit_quick_sign (ctrl_t ctrl, const char *fpr, strlist_t uids,
     }
 
   /* Sign. */
-  sign_uids (ctrl, es_stdout, keyblock, locusr,
+  err = sign_uids (ctrl, es_stdout, keyblock, locusr,
-             (SIGN_UIDS_QUICK | (local? SIGN_UIDS_LOCAL : 0)),
+                   (SIGN_UIDS_QUICK
-             &modified);
+                    | (local? SIGN_UIDS_LOCAL : 0)
+                    | (trustsig? SIGN_UIDS_TRUSTSIG : 0)),
+                   trustsig, &modified);
   es_fflush (es_stdout);
+  if (err)
+    goto leave;
 
   if (modified)
     {
@@ -3058,7 +3182,10 @@ keyedit_quick_sign (ctrl_t ctrl, const char *fpr, strlist_t uids,
 
  leave:
   if (err)
+    {
+      log_error (_("creating key signature failed: %s\n"), gpg_strerror (err));
       write_status_error ("keyedit.sign-key", err);
+    }
   release_kbnode (keyblock);
   keydb_release (kdbhd);
 }

g10/keyedit.h

@@ -48,7 +48,8 @@ void keyedit_quick_addadsk (ctrl_t ctrl, const char *fpr, const char *adskfpr);
 void keyedit_quick_revuid (ctrl_t ctrl, const char *username,
                            const char *uidtorev);
 void keyedit_quick_sign (ctrl_t ctrl, const char *fpr,
-                         strlist_t uids, strlist_t locusr, int local);
+                         strlist_t uids, strlist_t locusr,
+                         const char *trustsig, int local);
 void keyedit_quick_revsig (ctrl_t ctrl, const char *username,
                            const char *sigtorev, strlist_t affected_uids);
 void keyedit_quick_set_expire (ctrl_t ctrl,