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496 lines
12 KiB
C
496 lines
12 KiB
C
/* simple-pwquery.c - A simple password query client for gpg-agent
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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 <https://www.gnu.org/licenses/>.
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*/
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/* This module is intended as a simple client implementation to
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gpg-agent's GET_PASSPHRASE command. It can only cope with an
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already running gpg-agent. Some stuff is configurable in the
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header file. */
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#ifdef 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 <stddef.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <assuan.h>
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#ifdef HAVE_W32_SYSTEM
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#include <winsock2.h>
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#else
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#include <sys/socket.h>
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#include <sys/un.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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#define GNUPG_COMMON_NEED_AFLOCAL
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#include "../common/mischelp.h"
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#include "sysutils.h"
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#include "membuf.h"
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#define SIMPLE_PWQUERY_IMPLEMENTATION 1
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#include "simple-pwquery.h"
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#define SPWQ_OUT_OF_CORE gpg_error_from_errno (ENOMEM)
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#define SPWQ_IO_ERROR gpg_error_from_errno (EIO)
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#define SPWQ_PROTOCOL_ERROR gpg_error (GPG_ERR_PROTOCOL_VIOLATION)
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#define SPWQ_ERR_RESPONSE gpg_error (GPG_ERR_INV_RESPONSE)
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#define SPWQ_NO_AGENT gpg_error (GPG_ERR_NO_AGENT)
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#define SPWQ_SYS_ERROR gpg_error_from_syserror ()
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#define SPWQ_GENERAL_ERROR gpg_error (GPG_ERR_GENERAL)
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#define SPWQ_NO_PIN_ENTRY gpg_error (GPG_ERR_NO_PIN_ENTRY)
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#ifndef _
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#define _(a) (a)
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#endif
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#if !defined (hexdigitp) && !defined (xtoi_2)
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#define digitp(p) (*(p) >= '0' && *(p) <= '9')
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#define hexdigitp(a) (digitp (a) \
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|| (*(a) >= 'A' && *(a) <= 'F') \
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|| (*(a) >= 'a' && *(a) <= 'f'))
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#define xtoi_1(p) (*(p) <= '9'? (*(p)- '0'): \
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*(p) <= 'F'? (*(p)-'A'+10):(*(p)-'a'+10))
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#define xtoi_2(p) ((xtoi_1(p) * 16) + xtoi_1((p)+1))
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#endif
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/* Name of the socket to be used. This is a kludge to keep on using
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the existing code despite that we only support a standard socket. */
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static char *default_gpg_agent_info;
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#ifndef HAVE_STPCPY
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static char *
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my_stpcpy(char *a,const char *b)
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{
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while( *b )
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*a++ = *b++;
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*a = 0;
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return (char*)a;
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}
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#define stpcpy(a,b) my_stpcpy((a), (b))
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#endif
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/* Send an option to the agent */
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static int
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agent_send_option (assuan_context_t ctx, const char *name, const char *value)
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{
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int err;
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char *line;
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line = spwq_malloc (7 + strlen (name) + 1 + strlen (value) + 2);
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if (!line)
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return SPWQ_OUT_OF_CORE;
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strcpy (stpcpy (stpcpy (stpcpy (
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stpcpy (line, "OPTION "), name), "="), value), "\n");
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err = assuan_transact (ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
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spwq_free (line);
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return err;
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}
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/* Send all available options to the agent. */
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static int
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agent_send_all_options (assuan_context_t ctx)
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{
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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 *dft_xauthority = NULL;
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char *dft_pinentry_user_data = NULL;
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int rc = 0;
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dft_display = getenv ("DISPLAY");
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if (dft_display)
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{
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if ((rc = agent_send_option (ctx, "display", dft_display)))
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return rc;
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}
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dft_ttyname = getenv ("GPG_TTY");
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#if !defined(HAVE_W32_SYSTEM) && !defined(HAVE_BROKEN_TTYNAME)
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if ((!dft_ttyname || !*dft_ttyname) && ttyname (0))
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dft_ttyname = ttyname (0);
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#endif
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if (dft_ttyname && *dft_ttyname)
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{
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if ((rc=agent_send_option (ctx, "ttyname", dft_ttyname)))
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return rc;
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}
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dft_ttytype = getenv ("TERM");
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if (dft_ttyname && dft_ttytype)
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{
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if ((rc = agent_send_option (ctx, "ttytype", dft_ttytype)))
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return rc;
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}
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#if defined(HAVE_SETLOCALE)
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{
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char *old_lc = NULL;
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char *dft_lc = NULL;
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#if 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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char *p = spwq_malloc (strlen (old_lc)+1);
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if (!p)
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return SPWQ_OUT_OF_CORE;
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strcpy (p, old_lc);
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old_lc = p;
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}
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dft_lc = setlocale (LC_CTYPE, "");
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if (dft_ttyname && dft_lc)
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rc = agent_send_option (ctx, "lc-ctype", dft_lc);
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if (old_lc)
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{
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setlocale (LC_CTYPE, old_lc);
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spwq_free (old_lc);
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}
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if (rc)
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return rc;
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#endif
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#if 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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char *p = spwq_malloc (strlen (old_lc)+1);
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if (!p)
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return SPWQ_OUT_OF_CORE;
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strcpy (p, old_lc);
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old_lc = p;
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}
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dft_lc = setlocale (LC_MESSAGES, "");
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if (dft_ttyname && dft_lc)
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rc = agent_send_option (ctx, "lc-messages", dft_lc);
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if (old_lc)
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{
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setlocale (LC_MESSAGES, old_lc);
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spwq_free (old_lc);
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}
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if (rc)
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return rc;
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#endif
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}
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#endif /*HAVE_SETLOCALE*/
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/* Send the XAUTHORITY variable. */
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dft_xauthority = getenv ("XAUTHORITY");
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if (dft_xauthority)
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{
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/* We ignore errors here because older gpg-agents don't support
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this option. */
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agent_send_option (ctx, "xauthority", dft_xauthority);
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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 (dft_pinentry_user_data)
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{
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/* We ignore errors here because older gpg-agents don't support
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this option. */
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agent_send_option (ctx, "pinentry-user-data", dft_pinentry_user_data);
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}
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/* Tell the agent that we support Pinentry notifications. No
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error checking so that it will work with older agents. */
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assuan_transact (ctx, "OPTION allow-pinentry-notify",
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NULL, NULL, NULL, NULL, NULL, NULL);
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return 0;
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}
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/* Try to open a connection to the agent, send all options and return
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the file descriptor for the connection. Return -1 in case of
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error. */
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static int
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agent_open (assuan_context_t *ctx)
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{
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int rc;
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char *infostr;
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infostr = default_gpg_agent_info;
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if ( !infostr || !*infostr )
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{
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#ifdef SPWQ_USE_LOGGING
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log_error (_("no gpg-agent running in this session\n"));
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#endif
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*ctx = NULL;
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return SPWQ_NO_AGENT;
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}
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rc = assuan_new (ctx);
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if (rc)
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return rc;
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rc = assuan_socket_connect (*ctx, infostr, 0, 0);
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if (rc)
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{
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#ifdef SPWQ_USE_LOGGING
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log_error (_("can't connect to '%s': %s\n"),
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infostr, gpg_strerror (rc));
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#endif
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goto errout;
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}
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rc = agent_send_all_options (*ctx);
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if (rc)
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{
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#ifdef SPWQ_USE_LOGGING
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log_error (_("problem setting the gpg-agent options\n"));
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#endif
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goto errout;
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}
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return 0;
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errout:
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assuan_release (*ctx);
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*ctx = NULL;
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return rc;
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}
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/* Copy text to BUFFER and escape as required. Return a pointer to
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the end of the new buffer. Note that BUFFER must be large enough
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to keep the entire text; allocataing it 3 times the size of TEXT
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is sufficient. */
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static char *
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copy_and_escape (char *buffer, const char *text)
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{
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int i;
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const unsigned char *s = (unsigned char *)text;
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char *p = buffer;
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for (i=0; s[i]; i++)
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{
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if (s[i] < ' ' || s[i] == '+')
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{
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sprintf (p, "%%%02X", s[i]);
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p += 3;
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}
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else if (s[i] == ' ')
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*p++ = '+';
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else
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*p++ = s[i];
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}
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return p;
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}
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/* Set the name of the default socket to NAME. */
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int
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simple_pw_set_socket (const char *name)
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{
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spwq_free (default_gpg_agent_info);
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default_gpg_agent_info = NULL;
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if (name)
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{
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default_gpg_agent_info = spwq_malloc (strlen (name) + 1);
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if (!default_gpg_agent_info)
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return SPWQ_OUT_OF_CORE;
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strcpy (default_gpg_agent_info, name);
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}
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return 0;
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}
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/* This is the default inquiry callback. It merely handles the
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Pinentry notification. */
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static gpg_error_t
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default_inq_cb (void *opaque, const char *line)
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{
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(void)opaque;
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if (!strncmp (line, "PINENTRY_LAUNCHED", 17) && (line[17]==' '||!line[17]))
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{
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gnupg_allow_set_foregound_window ((pid_t)strtoul (line+17, NULL, 10));
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/* We do not return errors to avoid breaking other code. */
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}
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else
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{
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#ifdef SPWQ_USE_LOGGING
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log_debug ("ignoring gpg-agent inquiry '%s'\n", line);
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#endif
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}
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return 0;
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}
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/* Ask the gpg-agent for a passphrase and present the user with a
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DESCRIPTION, a PROMPT and optionally with a TRYAGAIN extra text.
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If a CACHEID is not NULL it is used to locate the passphrase in
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the cache and store it under this ID. If OPT_CHECK is true
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gpg-agent is asked to apply some checks on the passphrase security.
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If ERRORCODE is not NULL it should point a variable receiving an
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errorcode; this error code might be 0 if the user canceled the
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operation. The function returns NULL to indicate an error. */
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char *
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simple_pwquery (const char *cacheid,
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const char *tryagain,
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const char *prompt,
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const char *description,
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int opt_check,
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int *errorcode)
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{
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int rc;
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assuan_context_t ctx;
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membuf_t data;
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char *result = NULL;
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char *pw = NULL;
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char *p;
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size_t n;
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rc = agent_open (&ctx);
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if (rc)
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goto leave;
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if (!cacheid)
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cacheid = "X";
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if (!tryagain)
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tryagain = "X";
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if (!prompt)
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prompt = "X";
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if (!description)
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description = "X";
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{
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char *line;
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/* We allocate 3 times the needed space so that there is enough
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space for escaping. */
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line = spwq_malloc (15 + 10
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+ 3*strlen (cacheid) + 1
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+ 3*strlen (tryagain) + 1
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+ 3*strlen (prompt) + 1
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+ 3*strlen (description) + 1
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+ 2);
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if (!line)
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{
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rc = SPWQ_OUT_OF_CORE;
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goto leave;
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}
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strcpy (line, "GET_PASSPHRASE ");
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p = line+15;
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if (opt_check)
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p = stpcpy (p, "--check ");
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p = copy_and_escape (p, cacheid);
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*p++ = ' ';
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p = copy_and_escape (p, tryagain);
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*p++ = ' ';
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p = copy_and_escape (p, prompt);
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*p++ = ' ';
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p = copy_and_escape (p, description);
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*p++ = '\n';
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init_membuf_secure (&data, 64);
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rc = assuan_transact (ctx, line, put_membuf_cb, &data,
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default_inq_cb, NULL, NULL, NULL);
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spwq_free (line);
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/* Older Pinentries return the old assuan error code for canceled
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which gets translated by libassuan to GPG_ERR_ASS_CANCELED and
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not to the code for a user cancel. Fix this here. */
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if (rc && gpg_err_source (rc)
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&& gpg_err_code (rc) == GPG_ERR_ASS_CANCELED)
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rc = gpg_err_make (gpg_err_source (rc), GPG_ERR_CANCELED);
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if (rc)
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{
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p = get_membuf (&data, &n);
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if (p)
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wipememory (p, n);
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spwq_free (p);
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}
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else
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{
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put_membuf (&data, "", 1);
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result = get_membuf (&data, NULL);
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if (pw == NULL)
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rc = gpg_error_from_syserror ();
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}
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}
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leave:
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if (errorcode)
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*errorcode = rc;
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assuan_release (ctx);
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return result;
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}
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/* Ask the gpg-agent to clear the passphrase for the cache ID CACHEID. */
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int
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simple_pwclear (const char *cacheid)
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{
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char line[500];
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char *p;
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/* We need not more than 50 characters for the command and the
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terminating nul. */
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if (strlen (cacheid) * 3 > sizeof (line) - 50)
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return SPWQ_PROTOCOL_ERROR;
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strcpy (line, "CLEAR_PASSPHRASE ");
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p = line + 17;
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p = copy_and_escape (p, cacheid);
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*p++ = '\n';
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*p++ = '\0';
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return simple_query (line);
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}
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/* Perform the simple query QUERY (which must be new-line and 0
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terminated) and return the error code. */
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int
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simple_query (const char *query)
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{
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assuan_context_t ctx;
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int rc;
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rc = agent_open (&ctx);
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if (rc)
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return rc;
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rc = assuan_transact (ctx, query, NULL, NULL, NULL, NULL, NULL, NULL);
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assuan_release (ctx);
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return rc;
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}
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