mirror of
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380 lines
11 KiB
C
380 lines
11 KiB
C
/* asshelp.c - Helper functions for Assuan
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* Copyright (C) 2002, 2004, 2007 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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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 "i18n.h"
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#include "util.h"
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#include "exechelp.h"
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#include "sysutils.h"
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#include "status.h"
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#include "asshelp.h"
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static gpg_error_t
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send_one_option (assuan_context_t ctx, gpg_err_source_t errsource,
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const char *name, const char *value)
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{
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gpg_error_t err;
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char *optstr;
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if (!value || !*value)
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err = 0; /* Avoid sending empty strings. */
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else if (asprintf (&optstr, "OPTION %s=%s", name, 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 (ctx, optstr, NULL, NULL, NULL, NULL, NULL, NULL);
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xfree (optstr);
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}
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return err;
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}
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/* Send the assuan commands pertaining to the pinentry environment. The
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OPT_* arguments are optional and may be used to override the
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defaults taken from the current locale. */
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gpg_error_t
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send_pinentry_environment (assuan_context_t ctx,
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gpg_err_source_t errsource,
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const char *opt_display,
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const char *opt_ttyname,
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const char *opt_ttytype,
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const char *opt_lc_ctype,
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const char *opt_lc_messages,
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const char *opt_xauthority,
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const char *opt_pinentry_user_data)
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{
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gpg_error_t err = 0;
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char *dft_display = NULL;
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char *dft_ttyname = NULL;
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char *dft_ttytype = NULL;
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char *old_lc = NULL;
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char *dft_lc = NULL;
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char *dft_xauthority = NULL;
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char *dft_pinentry_user_data = NULL;
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/* Send the DISPLAY variable. */
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dft_display = getenv ("DISPLAY");
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if (opt_display || dft_display)
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{
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err = send_one_option (ctx, errsource, "display",
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opt_display ? opt_display : dft_display);
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if (err)
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return err;
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}
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/* Send the name of the TTY. */
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if (!opt_ttyname)
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{
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dft_ttyname = getenv ("GPG_TTY");
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if ((!dft_ttyname || !*dft_ttyname) && ttyname (0))
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dft_ttyname = ttyname (0);
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}
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if (opt_ttyname || dft_ttyname)
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{
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err = send_one_option (ctx, errsource, "ttyname",
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opt_ttyname ? opt_ttyname : dft_ttyname);
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if (err)
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return err;
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}
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/* Send the type of the TTY. */
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dft_ttytype = getenv ("TERM");
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if (opt_ttytype || (dft_ttyname && dft_ttytype))
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{
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err = send_one_option (ctx, errsource, "ttytype",
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opt_ttyname ? opt_ttytype : dft_ttytype);
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if (err)
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return err;
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}
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/* Send the value for LC_CTYPE. */
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#if defined(HAVE_SETLOCALE) && defined(LC_CTYPE)
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old_lc = setlocale (LC_CTYPE, NULL);
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if (old_lc)
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{
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old_lc = xtrystrdup (old_lc);
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if (!old_lc)
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return gpg_error_from_syserror ();
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}
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dft_lc = setlocale (LC_CTYPE, "");
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#endif
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if (opt_lc_ctype || (dft_ttyname && dft_lc))
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{
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err = send_one_option (ctx, errsource, "lc-ctype",
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opt_lc_ctype ? opt_lc_ctype : dft_lc);
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}
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#if defined(HAVE_SETLOCALE) && defined(LC_CTYPE)
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if (old_lc)
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{
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setlocale (LC_CTYPE, old_lc);
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xfree (old_lc);
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}
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#endif
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if (err)
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return err;
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/* Send the value for LC_MESSAGES. */
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#if defined(HAVE_SETLOCALE) && defined(LC_MESSAGES)
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old_lc = setlocale (LC_MESSAGES, NULL);
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if (old_lc)
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{
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old_lc = xtrystrdup (old_lc);
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if (!old_lc)
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return gpg_error_from_syserror ();
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}
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dft_lc = setlocale (LC_MESSAGES, "");
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#endif
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if (opt_lc_messages || (dft_ttyname && dft_lc))
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{
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err = send_one_option (ctx, errsource, "lc-messages",
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opt_lc_messages ? opt_lc_messages : dft_lc);
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}
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#if defined(HAVE_SETLOCALE) && defined(LC_MESSAGES)
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if (old_lc)
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{
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setlocale (LC_MESSAGES, old_lc);
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xfree (old_lc);
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}
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#endif
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if (err)
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return err;
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/* Send the XAUTHORITY variable. */
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dft_xauthority = getenv ("XAUTHORITY");
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if (opt_xauthority || dft_xauthority)
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{
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err = send_one_option (ctx, errsource, "xauthority",
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opt_xauthority ? opt_xauthority : dft_xauthority);
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if (gpg_err_code (err) == GPG_ERR_UNKNOWN_OPTION)
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err = 0;
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if (err)
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return err;
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}
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/* Send the PINENTRY_USER_DATA variable. */
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dft_pinentry_user_data = getenv ("PINENTRY_USER_DATA");
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if (opt_pinentry_user_data || dft_pinentry_user_data)
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{
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err = send_one_option (ctx, errsource, "pinentry-user-data",
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opt_pinentry_user_data ?
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opt_pinentry_user_data : dft_pinentry_user_data);
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if (gpg_err_code (err) == GPG_ERR_UNKNOWN_OPTION)
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err = 0;
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if (err)
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return err;
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}
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return 0;
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}
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/* Try to connect to the agent via socket or fork it off and work by
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pipes. Handle the server's initial greeting. Returns a new assuan
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context at R_CTX or an error code. */
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gpg_error_t
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start_new_gpg_agent (assuan_context_t *r_ctx,
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gpg_err_source_t errsource,
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const char *homedir,
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const char *agent_program,
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const char *opt_display,
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const char *opt_ttyname,
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const char *opt_ttytype,
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const char *opt_lc_ctype,
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const char *opt_lc_messages,
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const char *opt_xauthority,
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const char *opt_pinentry_user_data,
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int verbose, int debug,
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gpg_error_t (*status_cb)(ctrl_t, int, ...),
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ctrl_t status_cb_arg)
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{
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/* If we ever failed to connect via a socket we will force the use
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of the pipe based server for the lifetime of the process. */
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static int force_pipe_server = 0;
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gpg_error_t rc = 0;
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char *infostr, *p;
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assuan_context_t ctx;
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*r_ctx = NULL;
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restart:
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infostr = force_pipe_server? NULL : getenv ("GPG_AGENT_INFO");
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if (!infostr || !*infostr)
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{
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char *sockname;
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/* First check whether we can connect at the standard
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socket. */
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sockname = make_filename (homedir, "S.gpg-agent", NULL);
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rc = assuan_socket_connect (&ctx, sockname, 0);
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if (rc)
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{
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/* With no success start a new server. */
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if (verbose)
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log_info (_("no running gpg-agent - starting one\n"));
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if (status_cb)
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status_cb (status_cb_arg, STATUS_PROGRESS,
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"starting_agent ? 0 0", NULL);
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if (fflush (NULL))
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{
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gpg_error_t tmperr = gpg_error (gpg_err_code_from_errno (errno));
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log_error ("error flushing pending output: %s\n",
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strerror (errno));
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xfree (sockname);
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return tmperr;
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}
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if (!agent_program || !*agent_program)
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agent_program = gnupg_module_name (GNUPG_MODULE_NAME_AGENT);
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#ifdef HAVE_W32_SYSTEM
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{
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/* Under Windows we start the server in daemon mode. This
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is because the default is to use the standard socket
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and thus there is no need for the GPG_AGENT_INFO
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envvar. This is possible as we don't have a real unix
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domain socket but use a plain file and thus there is no
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need to care about non-local file systems. */
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const char *argv[3];
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argv[0] = "--daemon";
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argv[1] = "--use-standard-socket";
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argv[2] = NULL;
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rc = gnupg_spawn_process_detached (agent_program, argv, NULL);
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if (rc)
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log_debug ("failed to start agent `%s': %s\n",
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agent_program, gpg_strerror (rc));
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else
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{
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/* Give the agent some time to prepare itself. */
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gnupg_sleep (3);
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/* Now try again to connect the agent. */
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rc = assuan_socket_connect (&ctx, sockname, 0);
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}
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}
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#else /*!HAVE_W32_SYSTEM*/
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{
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const char *pgmname;
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const char *argv[3];
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int no_close_list[3];
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int i;
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if ( !(pgmname = strrchr (agent_program, '/')))
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pgmname = agent_program;
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else
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pgmname++;
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argv[0] = pgmname;
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argv[1] = "--server";
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argv[2] = NULL;
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i=0;
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if (log_get_fd () != -1)
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no_close_list[i++] = log_get_fd ();
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no_close_list[i++] = fileno (stderr);
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no_close_list[i] = -1;
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/* Connect to the agent and perform initial handshaking. */
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rc = assuan_pipe_connect (&ctx, agent_program, argv,
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no_close_list);
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}
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#endif /*!HAVE_W32_SYSTEM*/
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}
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xfree (sockname);
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}
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else
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{
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int prot;
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int pid;
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infostr = xstrdup (infostr);
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if ( !(p = strchr (infostr, PATHSEP_C)) || p == infostr)
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{
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log_error (_("malformed GPG_AGENT_INFO environment variable\n"));
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xfree (infostr);
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force_pipe_server = 1;
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goto restart;
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}
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*p++ = 0;
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pid = atoi (p);
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while (*p && *p != PATHSEP_C)
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p++;
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prot = *p? atoi (p+1) : 0;
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if (prot != 1)
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{
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log_error (_("gpg-agent protocol version %d is not supported\n"),
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prot);
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xfree (infostr);
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force_pipe_server = 1;
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goto restart;
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}
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rc = assuan_socket_connect (&ctx, infostr, pid);
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xfree (infostr);
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if (gpg_err_code (rc) == GPG_ERR_ASS_CONNECT_FAILED)
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{
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log_info (_("can't connect to the agent - trying fall back\n"));
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force_pipe_server = 1;
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goto restart;
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}
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}
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if (rc)
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{
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log_error ("can't connect to the agent: %s\n", gpg_strerror (rc));
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return gpg_error (GPG_ERR_NO_AGENT);
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}
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if (debug)
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log_debug ("connection to agent established\n");
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rc = assuan_transact (ctx, "RESET",
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NULL, NULL, NULL, NULL, NULL, NULL);
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if (!rc)
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rc = send_pinentry_environment (ctx, errsource,
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opt_display, opt_ttyname, opt_ttytype,
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opt_lc_ctype, opt_lc_messages,
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opt_xauthority,
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opt_pinentry_user_data);
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if (rc)
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{
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assuan_disconnect (ctx);
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return rc;
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}
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*r_ctx = ctx;
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return 0;
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}
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