sm: Implement pinentry loopback and reading passphrases from fd.

* doc/gpgsm.texi: Document '--pinentry-mode' and '--passphrase-fd'.
* sm/Makefile.am (gpgsm_SOURCES): Add new files
* sm/call-agent.c (struct default_inq_parm_s): New definition.
(start_agent): Pass in the pinentry mode.
(default_inq_cb): Handle 'PASSPHRASE' and 'NEW_PASSPHRASE' inquiries.
Adapt all call sites to the new callback cookie.
* sm/gpgsm.c (cmd_and_opt_values): Add new values.
(opts): Add new options.
(main): Handle new options.
* sm/gpgsm.h (struct opt): Add field 'pinentry_mode'.
* sm/passphrase.c: New file.
* sm/passphrase.h: Likewise.

GnuPG-bug-id: 1970
Signed-off-by: Justus Winter <[email protected]>

1 files changed, 90 insertions, 0 deletions

diff --git a/sm/passphrase.c b/sm/passphrase.c
new file mode 100644
index 000000000..6ad2b0a20
--- /dev/null
+++ b/sm/passphrase.c
@@ -0,0 +1,90 @@
+/* passphrase.c -  Get a passphrase
+ * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
+ *               2005, 2006, 2007, 2009, 2011 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <unistd.h>
+
+#include "passphrase.h"
+#include "gpgsm.h"
+#include "../common/shareddefs.h"
+#include "../common/ttyio.h"
+
+static char *fd_passwd = NULL;
+
+int
+have_static_passphrase ()
+{
+  return (!!fd_passwd
+          && (opt.batch || opt.pinentry_mode == PINENTRY_MODE_LOOPBACK));
+}
+
+/* Return a static passphrase.  The returned value is only valid as
+   long as no other passphrase related function is called.  NULL may
+   be returned if no passphrase has been set; better use
+   have_static_passphrase first.  */
+const char *
+get_static_passphrase (void)
+{
+  return fd_passwd;
+}
+
+void
+read_passphrase_from_fd (int fd)
+{
+  int i, len;
+  char *pw;
+
+  if (!opt.batch && opt.pinentry_mode != PINENTRY_MODE_LOOPBACK)
+    { /* Not used but we have to do a dummy read, so that it won't end
+         up at the begin of the message if the quite usual trick to
+         prepend the passphtrase to the message is used. */
+      char buf[1];
+
+      while (!(read (fd, buf, 1) != 1 || *buf == '\n'))
+        ;
+      *buf = 0;
+      return;
+    }
+
+  for (pw = NULL, i = len = 100; ; i++)
+    {
+      if (i >= len-1)
+        {
+          char *pw2 = pw;
+          len += 100;
+          pw = xmalloc_secure (len);
+          if (pw2)
+            {
+              memcpy (pw, pw2, i);
+              xfree (pw2);
+            }
+          else
+            i = 0;
+	}
+      if (read (fd, pw+i, 1) != 1 || pw[i] == '\n')
+        break;
+    }
+  pw[i] = 0;
+  if (!opt.batch && opt.pinentry_mode != PINENTRY_MODE_LOOPBACK)
+    tty_printf("\b\b\b   \n" );
+
+  xfree (fd_passwd);
+  fd_passwd = pw;
+}