810 lines
20 KiB
C
810 lines
20 KiB
C
/* engine-g13.c - G13 engine.
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Copyright (C) 2000 Werner Koch (dd9jn)
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Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2009 g10 Code GmbH
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This file is part of GPGME.
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GPGME is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of
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the License, or (at your option) any later version.
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GPGME is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#if HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdlib.h>
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#include <string.h>
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#include <assert.h>
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#ifdef HAVE_LOCALE_H
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#include <locale.h>
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#endif
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#include <fcntl.h> /* FIXME */
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#include <errno.h>
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#include "gpgme.h"
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#include "util.h"
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#include "ops.h"
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#include "wait.h"
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#include "priv-io.h"
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#include "sema.h"
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#include "assuan.h"
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#include "debug.h"
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#include "engine-backend.h"
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typedef struct
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{
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int fd; /* FD we talk about. */
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int server_fd;/* Server FD for this connection. */
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int dir; /* Inbound/Outbound, maybe given implicit? */
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void *data; /* Handler-specific data. */
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void *tag; /* ID from the user for gpgme_remove_io_callback. */
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char server_fd_str[15]; /* Same as SERVER_FD but as a string. We
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need this because _gpgme_io_fd2str can't
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be used on a closed descriptor. */
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} iocb_data_t;
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struct engine_g13
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{
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assuan_context_t assuan_ctx;
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int lc_ctype_set;
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int lc_messages_set;
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iocb_data_t status_cb;
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struct gpgme_io_cbs io_cbs;
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/* User provided callbacks. */
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struct {
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gpgme_assuan_data_cb_t data_cb;
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void *data_cb_value;
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gpgme_assuan_inquire_cb_t inq_cb;
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void *inq_cb_value;
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gpgme_assuan_status_cb_t status_cb;
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void *status_cb_value;
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} user;
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};
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typedef struct engine_g13 *engine_g13_t;
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static void g13_io_event (void *engine,
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gpgme_event_io_t type, void *type_data);
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static char *
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g13_get_version (const char *file_name)
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{
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return _gpgme_get_program_version (file_name ? file_name
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: _gpgme_get_default_g13_name ());
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}
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static const char *
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g13_get_req_version (void)
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{
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return "2.1.0";
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}
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static void
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close_notify_handler (int fd, void *opaque)
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{
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engine_g13_t g13 = opaque;
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assert (fd != -1);
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if (g13->status_cb.fd == fd)
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{
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if (g13->status_cb.tag)
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(*g13->io_cbs.remove) (g13->status_cb.tag);
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g13->status_cb.fd = -1;
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g13->status_cb.tag = NULL;
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}
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}
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/* This is the default inquiry callback. We use it to handle the
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Pinentry notifications. */
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static gpgme_error_t
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default_inq_cb (engine_g13_t g13, const char *keyword, const char *args)
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{
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gpg_error_t err;
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if (!strcmp (keyword, "PINENTRY_LAUNCHED"))
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{
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_gpgme_allow_set_foreground_window ((pid_t)strtoul (args, NULL, 10));
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}
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if (g13->user.inq_cb)
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{
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gpgme_data_t data = NULL;
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err = g13->user.inq_cb (g13->user.inq_cb_value,
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keyword, args, &data);
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if (!err && data)
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{
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/* FIXME: Returning data is not yet implemented. However we
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need to allow the caller to cleanup his data object.
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Thus we run the callback in finish mode immediately. */
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err = g13->user.inq_cb (g13->user.inq_cb_value,
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NULL, NULL, &data);
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}
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}
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else
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err = 0;
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return err;
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}
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static gpgme_error_t
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g13_cancel (void *engine)
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{
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engine_g13_t g13 = engine;
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if (!g13)
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return gpg_error (GPG_ERR_INV_VALUE);
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if (g13->status_cb.fd != -1)
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_gpgme_io_close (g13->status_cb.fd);
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if (g13->assuan_ctx)
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{
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assuan_release (g13->assuan_ctx);
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g13->assuan_ctx = NULL;
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}
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return 0;
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}
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static gpgme_error_t
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g13_cancel_op (void *engine)
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{
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engine_g13_t g13 = engine;
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if (!g13)
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return gpg_error (GPG_ERR_INV_VALUE);
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if (g13->status_cb.fd != -1)
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_gpgme_io_close (g13->status_cb.fd);
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return 0;
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}
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static void
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g13_release (void *engine)
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{
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engine_g13_t g13 = engine;
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if (!g13)
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return;
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g13_cancel (engine);
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free (g13);
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}
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static gpgme_error_t
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g13_new (void **engine, const char *file_name, const char *home_dir,
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const char *version)
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{
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gpgme_error_t err = 0;
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engine_g13_t g13;
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const char *pgmname;
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int argc;
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const char *argv[5];
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char *dft_display = NULL;
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char dft_ttyname[64];
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char *dft_ttytype = NULL;
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char *optstr;
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(void)version; /* Not yet used. */
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g13 = calloc (1, sizeof *g13);
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if (!g13)
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return gpg_error_from_syserror ();
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g13->status_cb.fd = -1;
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g13->status_cb.dir = 1;
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g13->status_cb.tag = 0;
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g13->status_cb.data = g13;
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pgmname = file_name ? file_name : _gpgme_get_default_g13_name ();
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argc = 0;
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argv[argc++] = _gpgme_get_basename (pgmname);
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if (home_dir)
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{
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argv[argc++] = "--homedir";
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argv[argc++] = home_dir;
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}
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argv[argc++] = "--server";
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argv[argc++] = NULL;
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err = assuan_new_ext (&g13->assuan_ctx, GPG_ERR_SOURCE_GPGME,
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&_gpgme_assuan_malloc_hooks, _gpgme_assuan_log_cb,
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NULL);
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if (err)
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goto leave;
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assuan_ctx_set_system_hooks (g13->assuan_ctx, &_gpgme_assuan_system_hooks);
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#if USE_DESCRIPTOR_PASSING
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err = assuan_pipe_connect (g13->assuan_ctx, pgmname, argv,
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NULL, NULL, NULL, ASSUAN_PIPE_CONNECT_FDPASSING);
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#else
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err = assuan_pipe_connect (g13->assuan_ctx, pgmname, argv,
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NULL, NULL, NULL, 0);
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#endif
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if (err)
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goto leave;
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err = _gpgme_getenv ("DISPLAY", &dft_display);
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if (err)
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goto leave;
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if (dft_display)
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{
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if (asprintf (&optstr, "OPTION display=%s", dft_display) < 0)
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{
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free (dft_display);
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err = gpg_error_from_syserror ();
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goto leave;
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}
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free (dft_display);
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err = assuan_transact (g13->assuan_ctx, optstr, NULL, NULL, NULL,
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NULL, NULL, NULL);
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free (optstr);
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if (err)
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goto leave;
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}
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if (isatty (1))
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{
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int rc;
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rc = ttyname_r (1, dft_ttyname, sizeof (dft_ttyname));
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/* Even though isatty() returns 1, ttyname_r() may fail in many
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ways, e.g., when /dev/pts is not accessible under chroot. */
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if (!rc)
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{
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if (asprintf (&optstr, "OPTION ttyname=%s", dft_ttyname) < 0)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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err = assuan_transact (g13->assuan_ctx, optstr, NULL, NULL, NULL,
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NULL, NULL, NULL);
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free (optstr);
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if (err)
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goto leave;
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err = _gpgme_getenv ("TERM", &dft_ttytype);
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if (err)
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goto leave;
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if (dft_ttytype)
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{
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if (asprintf (&optstr, "OPTION ttytype=%s", dft_ttytype) < 0)
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{
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free (dft_ttytype);
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err = gpg_error_from_syserror ();
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goto leave;
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}
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free (dft_ttytype);
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err = assuan_transact (g13->assuan_ctx, optstr, NULL, NULL,
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NULL, NULL, NULL, NULL);
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free (optstr);
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if (err)
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goto leave;
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}
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}
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}
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#ifdef HAVE_W32_SYSTEM
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/* Under Windows we need to use AllowSetForegroundWindow. Tell
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g13 to tell us when it needs it. */
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if (!err)
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{
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err = assuan_transact (g13->assuan_ctx, "OPTION allow-pinentry-notify",
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NULL, NULL, NULL, NULL, NULL, NULL);
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if (gpg_err_code (err) == GPG_ERR_UNKNOWN_OPTION)
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err = 0; /* This is a new feature of g13. */
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}
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#endif /*HAVE_W32_SYSTEM*/
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leave:
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if (err)
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g13_release (g13);
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else
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*engine = g13;
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return err;
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}
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static gpgme_error_t
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g13_set_locale (void *engine, int category, const char *value)
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{
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engine_g13_t g13 = engine;
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gpgme_error_t err;
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char *optstr;
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const char *catstr;
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/* FIXME: If value is NULL, we need to reset the option to default.
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But we can't do this. So we error out here. G13 needs support
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for this. */
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if (0)
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;
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#ifdef LC_CTYPE
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else if (category == LC_CTYPE)
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{
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catstr = "lc-ctype";
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if (!value && g13->lc_ctype_set)
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return gpg_error (GPG_ERR_INV_VALUE);
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if (value)
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g13->lc_ctype_set = 1;
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}
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#endif
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#ifdef LC_MESSAGES
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else if (category == LC_MESSAGES)
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{
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catstr = "lc-messages";
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if (!value && g13->lc_messages_set)
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return gpg_error (GPG_ERR_INV_VALUE);
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if (value)
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g13->lc_messages_set = 1;
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}
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#endif /* LC_MESSAGES */
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else
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return gpg_error (GPG_ERR_INV_VALUE);
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/* FIXME: Reset value to default. */
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if (!value)
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return 0;
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if (asprintf (&optstr, "OPTION %s=%s", catstr, value) < 0)
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err = gpg_error_from_syserror ();
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else
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{
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err = assuan_transact (g13->assuan_ctx, optstr, NULL, NULL,
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NULL, NULL, NULL, NULL);
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free (optstr);
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}
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return err;
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}
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#if USE_DESCRIPTOR_PASSING
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static gpgme_error_t
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g13_assuan_simple_command (assuan_context_t ctx, const char *cmd,
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engine_status_handler_t status_fnc,
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void *status_fnc_value)
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{
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gpg_error_t err;
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char *line;
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size_t linelen;
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(void)status_fnc;
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(void)status_fnc_value;
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err = assuan_write_line (ctx, cmd);
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if (err)
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return err;
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do
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{
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err = assuan_read_line (ctx, &line, &linelen);
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if (err)
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return err;
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if (*line == '#' || !linelen)
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continue;
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if (linelen >= 2
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&& line[0] == 'O' && line[1] == 'K'
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&& (line[2] == '\0' || line[2] == ' '))
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return 0;
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else if (linelen >= 4
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&& line[0] == 'E' && line[1] == 'R' && line[2] == 'R'
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&& line[3] == ' ')
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err = atoi (&line[4]);
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else if (linelen >= 2
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&& line[0] == 'S' && line[1] == ' ')
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{
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char *rest;
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rest = strchr (line + 2, ' ');
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if (!rest)
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rest = line + linelen; /* set to an empty string */
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else
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*(rest++) = 0;
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/* Nothing to do with status lines. */
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}
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else
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err = gpg_error (GPG_ERR_GENERAL);
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}
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while (!err);
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return err;
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}
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#endif
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static gpgme_error_t
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status_handler (void *opaque, int fd)
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{
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struct io_cb_data *data = (struct io_cb_data *) opaque;
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engine_g13_t g13 = (engine_g13_t) data->handler_value;
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gpgme_error_t err = 0;
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char *line;
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size_t linelen;
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do
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{
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err = assuan_read_line (g13->assuan_ctx, &line, &linelen);
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if (err)
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{
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/* Try our best to terminate the connection friendly. */
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/* assuan_write_line (g13->assuan_ctx, "BYE"); */
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TRACE2 (DEBUG_CTX, "gpgme:status_handler", g13,
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"fd 0x%x: error reading assuan line: %s",
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fd, gpg_strerror (err));
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}
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else if (linelen >= 3
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&& line[0] == 'E' && line[1] == 'R' && line[2] == 'R'
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&& (line[3] == '\0' || line[3] == ' '))
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{
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if (line[3] == ' ')
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err = atoi (&line[4]);
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if (! err)
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err = gpg_error (GPG_ERR_GENERAL);
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TRACE2 (DEBUG_CTX, "gpgme:status_handler", g13,
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"fd 0x%x: ERR line: %s",
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fd, err ? gpg_strerror (err) : "ok");
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/* Command execution errors are not fatal, as we use
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a session based protocol. */
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data->op_err = err;
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/* The caller will do the rest (namely, call cancel_op,
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which closes status_fd). */
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return 0;
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}
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else if (linelen >= 2
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&& line[0] == 'O' && line[1] == 'K'
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&& (line[2] == '\0' || line[2] == ' '))
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{
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TRACE1 (DEBUG_CTX, "gpgme:status_handler", g13,
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"fd 0x%x: OK line", fd);
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_gpgme_io_close (g13->status_cb.fd);
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return 0;
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}
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else if (linelen > 2
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&& line[0] == 'D' && line[1] == ' ')
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{
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/* We are using the colon handler even for plain inline data
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- strange name for that function but for historic reasons
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we keep it. */
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/* FIXME We can't use this for binary data because we
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assume this is a string. For the current usage of colon
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output it is correct. */
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char *src = line + 2;
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char *end = line + linelen;
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char *dst = src;
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linelen = 0;
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while (src < end)
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{
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if (*src == '%' && src + 2 < end)
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{
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/* Handle escaped characters. */
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++src;
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*dst++ = _gpgme_hextobyte (src);
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src += 2;
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}
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else
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*dst++ = *src++;
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linelen++;
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}
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src = line + 2;
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if (linelen && g13->user.data_cb)
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err = g13->user.data_cb (g13->user.data_cb_value,
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src, linelen);
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else
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err = 0;
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TRACE2 (DEBUG_CTX, "gpgme:g13_status_handler", g13,
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"fd 0x%x: D inlinedata; status from cb: %s",
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fd, (g13->user.data_cb ?
|
||
(err? gpg_strerror (err):"ok"):"no callback"));
|
||
|
||
}
|
||
else if (linelen > 2
|
||
&& line[0] == 'S' && line[1] == ' ')
|
||
{
|
||
char *src;
|
||
char *args;
|
||
|
||
src = line + 2;
|
||
while (*src == ' ')
|
||
src++;
|
||
|
||
args = strchr (line + 2, ' ');
|
||
if (!args)
|
||
args = line + linelen; /* set to an empty string */
|
||
else
|
||
*(args++) = 0;
|
||
|
||
while (*args == ' ')
|
||
args++;
|
||
|
||
if (g13->user.status_cb)
|
||
err = g13->user.status_cb (g13->user.status_cb_value,
|
||
src, args);
|
||
else
|
||
err = 0;
|
||
|
||
TRACE3 (DEBUG_CTX, "gpgme:g13_status_handler", g13,
|
||
"fd 0x%x: S line (%s) - status from cb: %s",
|
||
fd, line+2, (g13->user.status_cb ?
|
||
(err? gpg_strerror (err):"ok"):"no callback"));
|
||
}
|
||
else if (linelen >= 7
|
||
&& line[0] == 'I' && line[1] == 'N' && line[2] == 'Q'
|
||
&& line[3] == 'U' && line[4] == 'I' && line[5] == 'R'
|
||
&& line[6] == 'E'
|
||
&& (line[7] == '\0' || line[7] == ' '))
|
||
{
|
||
char *src;
|
||
char *args;
|
||
|
||
for (src=line+7; *src == ' '; src++)
|
||
;
|
||
|
||
args = strchr (src, ' ');
|
||
if (!args)
|
||
args = line + linelen; /* Let it point to an empty string. */
|
||
else
|
||
*(args++) = 0;
|
||
|
||
while (*args == ' ')
|
||
args++;
|
||
|
||
err = default_inq_cb (g13, src, args);
|
||
if (!err)
|
||
{
|
||
/* Flush and send END. */
|
||
err = assuan_send_data (g13->assuan_ctx, NULL, 0);
|
||
}
|
||
else if (gpg_err_code (err) == GPG_ERR_ASS_CANCELED)
|
||
{
|
||
/* Flush and send CANcel. */
|
||
err = assuan_send_data (g13->assuan_ctx, NULL, 1);
|
||
}
|
||
assuan_write_line (g13->assuan_ctx, "END");
|
||
}
|
||
}
|
||
while (!err && assuan_pending_line (g13->assuan_ctx));
|
||
|
||
return err;
|
||
}
|
||
|
||
|
||
static gpgme_error_t
|
||
add_io_cb (engine_g13_t g13, iocb_data_t *iocbd, gpgme_io_cb_t handler)
|
||
{
|
||
gpgme_error_t err;
|
||
|
||
TRACE_BEG2 (DEBUG_ENGINE, "engine-g13:add_io_cb", g13,
|
||
"fd %d, dir %d", iocbd->fd, iocbd->dir);
|
||
err = (*g13->io_cbs.add) (g13->io_cbs.add_priv,
|
||
iocbd->fd, iocbd->dir,
|
||
handler, iocbd->data, &iocbd->tag);
|
||
if (err)
|
||
return TRACE_ERR (err);
|
||
if (!iocbd->dir)
|
||
/* FIXME Kludge around poll() problem. */
|
||
err = _gpgme_io_set_nonblocking (iocbd->fd);
|
||
return TRACE_ERR (err);
|
||
}
|
||
|
||
|
||
static gpgme_error_t
|
||
start (engine_g13_t g13, const char *command)
|
||
{
|
||
gpgme_error_t err;
|
||
assuan_fd_t afdlist[5];
|
||
int fdlist[5];
|
||
int nfds;
|
||
int i;
|
||
|
||
/* We need to know the fd used by assuan for reads. We do this by
|
||
using the assumption that the first returned fd from
|
||
assuan_get_active_fds() is always this one. */
|
||
nfds = assuan_get_active_fds (g13->assuan_ctx, 0 /* read fds */,
|
||
afdlist, DIM (afdlist));
|
||
if (nfds < 1)
|
||
return gpg_error (GPG_ERR_GENERAL); /* FIXME */
|
||
/* For now... */
|
||
for (i = 0; i < nfds; i++)
|
||
fdlist[i] = (int) afdlist[i];
|
||
|
||
/* We "duplicate" the file descriptor, so we can close it here (we
|
||
can't close fdlist[0], as that is closed by libassuan, and
|
||
closing it here might cause libassuan to close some unrelated FD
|
||
later). Alternatively, we could special case status_fd and
|
||
register/unregister it manually as needed, but this increases
|
||
code duplication and is more complicated as we can not use the
|
||
close notifications etc. A third alternative would be to let
|
||
Assuan know that we closed the FD, but that complicates the
|
||
Assuan interface. */
|
||
|
||
g13->status_cb.fd = _gpgme_io_dup (fdlist[0]);
|
||
if (g13->status_cb.fd < 0)
|
||
return gpg_error_from_syserror ();
|
||
|
||
if (_gpgme_io_set_close_notify (g13->status_cb.fd,
|
||
close_notify_handler, g13))
|
||
{
|
||
_gpgme_io_close (g13->status_cb.fd);
|
||
g13->status_cb.fd = -1;
|
||
return gpg_error (GPG_ERR_GENERAL);
|
||
}
|
||
|
||
err = add_io_cb (g13, &g13->status_cb, status_handler);
|
||
if (!err)
|
||
err = assuan_write_line (g13->assuan_ctx, command);
|
||
|
||
if (!err)
|
||
g13_io_event (g13, GPGME_EVENT_START, NULL);
|
||
|
||
return err;
|
||
}
|
||
|
||
|
||
#if USE_DESCRIPTOR_PASSING
|
||
static gpgme_error_t
|
||
g13_reset (void *engine)
|
||
{
|
||
engine_g13_t g13 = engine;
|
||
|
||
/* We must send a reset because we need to reset the list of
|
||
signers. Note that RESET does not reset OPTION commands. */
|
||
return g13_assuan_simple_command (g13->assuan_ctx, "RESET", NULL, NULL);
|
||
}
|
||
#endif
|
||
|
||
|
||
static gpgme_error_t
|
||
g13_transact (void *engine,
|
||
const char *command,
|
||
gpgme_assuan_data_cb_t data_cb,
|
||
void *data_cb_value,
|
||
gpgme_assuan_inquire_cb_t inq_cb,
|
||
void *inq_cb_value,
|
||
gpgme_assuan_status_cb_t status_cb,
|
||
void *status_cb_value)
|
||
{
|
||
engine_g13_t g13 = engine;
|
||
gpgme_error_t err;
|
||
|
||
if (!g13 || !command || !*command)
|
||
return gpg_error (GPG_ERR_INV_VALUE);
|
||
|
||
g13->user.data_cb = data_cb;
|
||
g13->user.data_cb_value = data_cb_value;
|
||
g13->user.inq_cb = inq_cb;
|
||
g13->user.inq_cb_value = inq_cb_value;
|
||
g13->user.status_cb = status_cb;
|
||
g13->user.status_cb_value = status_cb_value;
|
||
|
||
err = start (g13, command);
|
||
return err;
|
||
}
|
||
|
||
|
||
|
||
static void
|
||
g13_set_io_cbs (void *engine, gpgme_io_cbs_t io_cbs)
|
||
{
|
||
engine_g13_t g13 = engine;
|
||
g13->io_cbs = *io_cbs;
|
||
}
|
||
|
||
|
||
static void
|
||
g13_io_event (void *engine, gpgme_event_io_t type, void *type_data)
|
||
{
|
||
engine_g13_t g13 = engine;
|
||
|
||
TRACE3 (DEBUG_ENGINE, "gpgme:g13_io_event", g13,
|
||
"event %p, type %d, type_data %p",
|
||
g13->io_cbs.event, type, type_data);
|
||
if (g13->io_cbs.event)
|
||
(*g13->io_cbs.event) (g13->io_cbs.event_priv, type, type_data);
|
||
}
|
||
|
||
|
||
struct engine_ops _gpgme_engine_ops_g13 =
|
||
{
|
||
/* Static functions. */
|
||
_gpgme_get_default_g13_name,
|
||
NULL,
|
||
g13_get_version,
|
||
g13_get_req_version,
|
||
g13_new,
|
||
|
||
/* Member functions. */
|
||
g13_release,
|
||
#if USE_DESCRIPTOR_PASSING
|
||
g13_reset,
|
||
#else
|
||
NULL, /* reset */
|
||
#endif
|
||
NULL, /* set_status_cb */
|
||
NULL, /* set_status_handler */
|
||
NULL, /* set_command_handler */
|
||
NULL, /* set_colon_line_handler */
|
||
g13_set_locale,
|
||
NULL, /* set_protocol */
|
||
NULL, /* decrypt */
|
||
NULL, /* decrypt_verify */
|
||
NULL, /* delete */
|
||
NULL, /* edit */
|
||
NULL, /* encrypt */
|
||
NULL, /* encrypt_sign */
|
||
NULL, /* export */
|
||
NULL, /* export_ext */
|
||
NULL, /* genkey */
|
||
NULL, /* import */
|
||
NULL, /* keylist */
|
||
NULL, /* keylist_ext */
|
||
NULL, /* sign */
|
||
NULL, /* trustlist */
|
||
NULL, /* verify */
|
||
NULL, /* getauditlog */
|
||
g13_transact,
|
||
NULL, /* conf_load */
|
||
NULL, /* conf_save */
|
||
g13_set_io_cbs,
|
||
g13_io_event,
|
||
g13_cancel,
|
||
g13_cancel_op,
|
||
NULL, /* passwd */
|
||
NULL, /* set_pinentry_mode */
|
||
NULL /* opspawn */
|
||
};
|