mirror of
git://git.gnupg.org/gnupg.git
synced 2024-12-22 10:19:57 +01:00
380 lines
11 KiB
C
380 lines
11 KiB
C
/* asshelp.c - Helper functions for Assuan
|
|
* Copyright (C) 2002, 2004, 2007 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 <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#ifdef HAVE_LOCALE_H
|
|
#include <locale.h>
|
|
#endif
|
|
|
|
#include "i18n.h"
|
|
#include "util.h"
|
|
#include "exechelp.h"
|
|
#include "sysutils.h"
|
|
#include "status.h"
|
|
#include "asshelp.h"
|
|
|
|
|
|
static gpg_error_t
|
|
send_one_option (assuan_context_t ctx, gpg_err_source_t errsource,
|
|
const char *name, const char *value)
|
|
{
|
|
gpg_error_t err;
|
|
char *optstr;
|
|
|
|
if (!value || !*value)
|
|
err = 0; /* Avoid sending empty strings. */
|
|
else if (asprintf (&optstr, "OPTION %s=%s", name, value ) < 0)
|
|
err = gpg_error_from_syserror ();
|
|
else
|
|
{
|
|
err = assuan_transact (ctx, optstr, NULL, NULL, NULL, NULL, NULL, NULL);
|
|
free (optstr);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
|
|
/* Send the assuan commands pertaining to the pinentry environment. The
|
|
OPT_* arguments are optional and may be used to override the
|
|
defaults taken from the current locale. */
|
|
gpg_error_t
|
|
send_pinentry_environment (assuan_context_t ctx,
|
|
gpg_err_source_t errsource,
|
|
const char *opt_display,
|
|
const char *opt_ttyname,
|
|
const char *opt_ttytype,
|
|
const char *opt_lc_ctype,
|
|
const char *opt_lc_messages,
|
|
const char *opt_xauthority,
|
|
const char *opt_pinentry_user_data)
|
|
{
|
|
gpg_error_t err = 0;
|
|
char *dft_display = NULL;
|
|
char *dft_ttyname = NULL;
|
|
char *dft_ttytype = NULL;
|
|
char *old_lc = NULL;
|
|
char *dft_lc = NULL;
|
|
char *dft_xauthority = NULL;
|
|
char *dft_pinentry_user_data = NULL;
|
|
|
|
/* Send the DISPLAY variable. */
|
|
dft_display = getenv ("DISPLAY");
|
|
if (opt_display || dft_display)
|
|
{
|
|
err = send_one_option (ctx, errsource, "display",
|
|
opt_display ? opt_display : dft_display);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
/* Send the name of the TTY. */
|
|
if (!opt_ttyname)
|
|
{
|
|
dft_ttyname = getenv ("GPG_TTY");
|
|
if ((!dft_ttyname || !*dft_ttyname) && ttyname (0))
|
|
dft_ttyname = ttyname (0);
|
|
}
|
|
if (opt_ttyname || dft_ttyname)
|
|
{
|
|
err = send_one_option (ctx, errsource, "ttyname",
|
|
opt_ttyname ? opt_ttyname : dft_ttyname);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
/* Send the type of the TTY. */
|
|
dft_ttytype = getenv ("TERM");
|
|
if (opt_ttytype || (dft_ttyname && dft_ttytype))
|
|
{
|
|
err = send_one_option (ctx, errsource, "ttytype",
|
|
opt_ttyname ? opt_ttytype : dft_ttytype);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
/* Send the value for LC_CTYPE. */
|
|
#if defined(HAVE_SETLOCALE) && defined(LC_CTYPE)
|
|
old_lc = setlocale (LC_CTYPE, NULL);
|
|
if (old_lc)
|
|
{
|
|
old_lc = strdup (old_lc);
|
|
if (!old_lc)
|
|
return gpg_error_from_syserror ();
|
|
}
|
|
dft_lc = setlocale (LC_CTYPE, "");
|
|
#endif
|
|
if (opt_lc_ctype || (dft_ttyname && dft_lc))
|
|
{
|
|
err = send_one_option (ctx, errsource, "lc-ctype",
|
|
opt_lc_ctype ? opt_lc_ctype : dft_lc);
|
|
}
|
|
#if defined(HAVE_SETLOCALE) && defined(LC_CTYPE)
|
|
if (old_lc)
|
|
{
|
|
setlocale (LC_CTYPE, old_lc);
|
|
free (old_lc);
|
|
}
|
|
#endif
|
|
if (err)
|
|
return err;
|
|
|
|
/* Send the value for LC_MESSAGES. */
|
|
#if defined(HAVE_SETLOCALE) && defined(LC_MESSAGES)
|
|
old_lc = setlocale (LC_MESSAGES, NULL);
|
|
if (old_lc)
|
|
{
|
|
old_lc = strdup (old_lc);
|
|
if (!old_lc)
|
|
return gpg_error_from_syserror ();
|
|
}
|
|
dft_lc = setlocale (LC_MESSAGES, "");
|
|
#endif
|
|
if (opt_lc_messages || (dft_ttyname && dft_lc))
|
|
{
|
|
err = send_one_option (ctx, errsource, "lc-messages",
|
|
opt_lc_messages ? opt_lc_messages : dft_lc);
|
|
}
|
|
#if defined(HAVE_SETLOCALE) && defined(LC_MESSAGES)
|
|
if (old_lc)
|
|
{
|
|
setlocale (LC_MESSAGES, old_lc);
|
|
free (old_lc);
|
|
}
|
|
#endif
|
|
if (err)
|
|
return err;
|
|
|
|
/* Send the XAUTHORITY variable. */
|
|
dft_xauthority = getenv ("XAUTHORITY");
|
|
if (opt_xauthority || dft_xauthority)
|
|
{
|
|
err = send_one_option (ctx, errsource, "xauthority",
|
|
opt_xauthority ? opt_xauthority : dft_xauthority);
|
|
if (gpg_err_code (err) == GPG_ERR_UNKNOWN_OPTION)
|
|
err = 0;
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
/* Send the PINENTRY_USER_DATA variable. */
|
|
dft_pinentry_user_data = getenv ("PINENTRY_USER_DATA");
|
|
if (opt_pinentry_user_data || dft_pinentry_user_data)
|
|
{
|
|
err = send_one_option (ctx, errsource, "pinentry-user-data",
|
|
opt_pinentry_user_data ?
|
|
opt_pinentry_user_data : dft_pinentry_user_data);
|
|
if (gpg_err_code (err) == GPG_ERR_UNKNOWN_OPTION)
|
|
err = 0;
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Try to connect to the agent via socket or fork it off and work by
|
|
pipes. Handle the server's initial greeting. Returns a new assuan
|
|
context at R_CTX or an error code. */
|
|
gpg_error_t
|
|
start_new_gpg_agent (assuan_context_t *r_ctx,
|
|
gpg_err_source_t errsource,
|
|
const char *homedir,
|
|
const char *agent_program,
|
|
const char *opt_display,
|
|
const char *opt_ttyname,
|
|
const char *opt_ttytype,
|
|
const char *opt_lc_ctype,
|
|
const char *opt_lc_messages,
|
|
const char *opt_xauthority,
|
|
const char *opt_pinentry_user_data,
|
|
int verbose, int debug,
|
|
gpg_error_t (*status_cb)(ctrl_t, int, ...),
|
|
ctrl_t status_cb_arg)
|
|
{
|
|
/* If we ever failed to connect via a socket we will force the use
|
|
of the pipe based server for the lifetime of the process. */
|
|
static int force_pipe_server = 0;
|
|
|
|
gpg_error_t rc = 0;
|
|
char *infostr, *p;
|
|
assuan_context_t ctx;
|
|
|
|
*r_ctx = NULL;
|
|
|
|
restart:
|
|
infostr = force_pipe_server? NULL : getenv ("GPG_AGENT_INFO");
|
|
if (!infostr || !*infostr)
|
|
{
|
|
char *sockname;
|
|
|
|
/* First check whether we can connect at the standard
|
|
socket. */
|
|
sockname = make_filename (homedir, "S.gpg-agent", NULL);
|
|
rc = assuan_socket_connect (&ctx, sockname, 0);
|
|
|
|
if (rc)
|
|
{
|
|
/* With no success start a new server. */
|
|
if (verbose)
|
|
log_info (_("no running gpg-agent - starting one\n"));
|
|
|
|
if (status_cb)
|
|
status_cb (status_cb_arg, STATUS_PROGRESS,
|
|
"starting_agent ? 0 0", NULL);
|
|
|
|
if (fflush (NULL))
|
|
{
|
|
gpg_error_t tmperr = gpg_error (gpg_err_code_from_errno (errno));
|
|
log_error ("error flushing pending output: %s\n",
|
|
strerror (errno));
|
|
xfree (sockname);
|
|
return tmperr;
|
|
}
|
|
|
|
if (!agent_program || !*agent_program)
|
|
agent_program = gnupg_module_name (GNUPG_MODULE_NAME_AGENT);
|
|
|
|
#ifdef HAVE_W32_SYSTEM
|
|
{
|
|
/* Under Windows we start the server in daemon mode. This
|
|
is because the default is to use the standard socket
|
|
and thus there is no need for the GPG_AGENT_INFO
|
|
envvar. This is possible as we don't have a real unix
|
|
domain socket but use a plain file and thus there is no
|
|
need to care about non-local file systems. */
|
|
const char *argv[3];
|
|
|
|
argv[0] = "--daemon";
|
|
argv[1] = "--use-standard-socket";
|
|
argv[2] = NULL;
|
|
|
|
rc = gnupg_spawn_process_detached (agent_program, argv, NULL);
|
|
if (rc)
|
|
log_debug ("failed to start agent `%s': %s\n",
|
|
agent_program, gpg_strerror (rc));
|
|
else
|
|
{
|
|
/* Give the agent some time to prepare itself. */
|
|
gnupg_sleep (3);
|
|
/* Now try again to connect the agent. */
|
|
rc = assuan_socket_connect (&ctx, sockname, 0);
|
|
}
|
|
}
|
|
#else /*!HAVE_W32_SYSTEM*/
|
|
{
|
|
const char *pgmname;
|
|
const char *argv[3];
|
|
int no_close_list[3];
|
|
int i;
|
|
|
|
if ( !(pgmname = strrchr (agent_program, '/')))
|
|
pgmname = agent_program;
|
|
else
|
|
pgmname++;
|
|
|
|
argv[0] = pgmname;
|
|
argv[1] = "--server";
|
|
argv[2] = NULL;
|
|
|
|
i=0;
|
|
if (log_get_fd () != -1)
|
|
no_close_list[i++] = log_get_fd ();
|
|
no_close_list[i++] = fileno (stderr);
|
|
no_close_list[i] = -1;
|
|
|
|
/* Connect to the agent and perform initial handshaking. */
|
|
rc = assuan_pipe_connect (&ctx, agent_program, argv,
|
|
no_close_list);
|
|
}
|
|
#endif /*!HAVE_W32_SYSTEM*/
|
|
}
|
|
xfree (sockname);
|
|
}
|
|
else
|
|
{
|
|
int prot;
|
|
int pid;
|
|
|
|
infostr = xstrdup (infostr);
|
|
if ( !(p = strchr (infostr, PATHSEP_C)) || p == infostr)
|
|
{
|
|
log_error (_("malformed GPG_AGENT_INFO environment variable\n"));
|
|
xfree (infostr);
|
|
force_pipe_server = 1;
|
|
goto restart;
|
|
}
|
|
*p++ = 0;
|
|
pid = atoi (p);
|
|
while (*p && *p != PATHSEP_C)
|
|
p++;
|
|
prot = *p? atoi (p+1) : 0;
|
|
if (prot != 1)
|
|
{
|
|
log_error (_("gpg-agent protocol version %d is not supported\n"),
|
|
prot);
|
|
xfree (infostr);
|
|
force_pipe_server = 1;
|
|
goto restart;
|
|
}
|
|
|
|
rc = assuan_socket_connect (&ctx, infostr, pid);
|
|
xfree (infostr);
|
|
if (gpg_err_code (rc) == GPG_ERR_ASS_CONNECT_FAILED)
|
|
{
|
|
log_info (_("can't connect to the agent - trying fall back\n"));
|
|
force_pipe_server = 1;
|
|
goto restart;
|
|
}
|
|
}
|
|
|
|
if (rc)
|
|
{
|
|
log_error ("can't connect to the agent: %s\n", gpg_strerror (rc));
|
|
return gpg_error (GPG_ERR_NO_AGENT);
|
|
}
|
|
|
|
if (debug)
|
|
log_debug ("connection to agent established\n");
|
|
|
|
rc = assuan_transact (ctx, "RESET",
|
|
NULL, NULL, NULL, NULL, NULL, NULL);
|
|
if (!rc)
|
|
rc = send_pinentry_environment (ctx, errsource,
|
|
opt_display, opt_ttyname, opt_ttytype,
|
|
opt_lc_ctype, opt_lc_messages,
|
|
opt_xauthority,
|
|
opt_pinentry_user_data);
|
|
if (rc)
|
|
{
|
|
assuan_disconnect (ctx);
|
|
return rc;
|
|
}
|
|
|
|
*r_ctx = ctx;
|
|
return 0;
|
|
}
|
|
|