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gpg: Print a warning if GKR has hijacked gpg-agent.
* g10/call-agent.c (check_hijacking): New. (start_agent): Call it. (membuf_data_cb, default_inq_cb): Move more to the top. -- Note that GUIs may use the gpg status line [GNUPG:] ERROR check_hijacking 33554509 to detect this and print an appropriate warning.
This commit is contained in:
Werner Koch
parent
efecbb7a3f
commit
b896fccaad
125
g10/call-agent.c
125
g10/call-agent.c
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@ -1,6 +1,7 @@
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/* call-agent.c - Divert GPG operations to the agent.
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* Copyright (C) 2001, 2002, 2003, 2006, 2007,
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* 2008, 2009 Free Software Foundation, Inc.
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* Copyright (C) 2014 Werner Koch
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*
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* This file is part of GnuPG.
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*
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@ -108,6 +109,95 @@ status_sc_op_failure (int rc)
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}
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static gpg_error_t
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membuf_data_cb (void *opaque, const void *buffer, size_t length)
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{
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membuf_t *data = opaque;
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if (buffer)
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put_membuf (data, buffer, length);
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return 0;
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}
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/* This is the default inquiry callback. It mainly handles the
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Pinentry notifications. */
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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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/* There is no working server mode yet thus we use
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AllowSetForegroundWindow window right here. We might want to
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do this anyway in case gpg is called on the console. */
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gnupg_allow_set_foregound_window ((pid_t)strtoul (line+17, NULL, 10));
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/* We do not pass errors to avoid breaking other code. */
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}
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else
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log_debug ("ignoring gpg-agent inquiry `%s'\n", line);
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return 0;
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}
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/* Check whether gnome-keyring hijacked the gpg-agent. */
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static void
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check_hijacking (assuan_context_t ctx)
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{
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membuf_t mb;
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char *string;
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init_membuf (&mb, 64);
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/* AGENT_ID is a command implemented by gnome-keyring-daemon. IT
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does not reatun any data but an OK line with a remark. */
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if (assuan_transact (ctx, "AGENT_ID",
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membuf_data_cb, &mb, NULL, NULL, NULL, NULL))
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{
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xfree (get_membuf (&mb, NULL));
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return; /* Error - Probably not hijacked. */
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}
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put_membuf (&mb, "", 1);
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string = get_membuf (&mb, NULL);
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if (!string || !*string)
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{
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/* Definitley hijacked - show a warning prompt. */
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static int shown;
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const char warn1[] =
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"The GNOME keyring manager hijacked the GnuPG agent.";
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const char warn2[] =
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"GnuPG will not work proberly - please configure that "
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"tool to not interfere with the GnuPG system!";
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log_info ("WARNING: %s\n", warn1);
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log_info ("WARNING: %s\n", warn2);
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/* (GPG_ERR_SOURCRE_GPG, GPG_ERR_NO_AGENT) */
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write_status_text (STATUS_ERROR, "check_hijacking 33554509");
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xfree (string);
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string = strconcat (warn1, "\n\n", warn2, NULL);
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if (string && !shown && !opt.batch)
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{
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/* NB: The Pinentry based prompt will only work if a
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gnome-keyring manager passes invalid commands on to the
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original gpg-agent. */
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char *cmd, *cmdargs;
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cmdargs = percent_plus_escape (string);
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cmd = strconcat ("GET_CONFIRMATION ", cmdargs, NULL);
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xfree (cmdargs);
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if (cmd)
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{
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assuan_transact (ctx, cmd, NULL, NULL,
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default_inq_cb, NULL,
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NULL, NULL);
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xfree (cmd);
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shown = 1;
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}
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}
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}
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xfree (string);
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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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@ -138,6 +228,7 @@ start_agent (int for_card)
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agents. */
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assuan_transact (agent_ctx, "OPTION allow-pinentry-notify",
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NULL, NULL, NULL, NULL, NULL, NULL);
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check_hijacking (agent_ctx);
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}
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}
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@ -278,29 +369,6 @@ get_serialno_cb (void *opaque, const char *line)
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}
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/* This is the default inquiry callback. It mainly handles the
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Pinentry notifications. */
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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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/* There is no working server mode yet thus we use
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AllowSetForegroundWindow window right here. We might want to
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do this anyway in case gpg is called on the console. */
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gnupg_allow_set_foregound_window ((pid_t)strtoul (line+17, NULL, 10));
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/* We do not pass errors to avoid breaking other code. */
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}
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else
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log_debug ("ignoring gpg-agent inquiry `%s'\n", line);
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return 0;
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}
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/* Release the card info structure INFO. */
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void
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agent_release_card_info (struct agent_card_info_s *info)
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@ -942,17 +1010,6 @@ select_openpgp (const char *serialno)
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static gpg_error_t
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membuf_data_cb (void *opaque, const void *buffer, size_t length)
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{
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membuf_t *data = opaque;
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if (buffer)
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put_membuf (data, buffer, length);
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return 0;
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}
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/* Helper returning a command option to describe the used hash
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algorithm. See scd/command.c:cmd_pksign. */
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static const char *
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