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agent: Clean up pinentry access locking.
* agent/agent.h (struct server_control_s): Rename PINENTRY_ACTIVE. * agent/call-pinentry.c (entry_owner): Remove. (agent_reset_query): Use thread private object of PINENTRY_ACTIVE. (unlock_pinentry): Add CTRL to arguments to access thread private. Check and decrement PINENTRY_ACTIVE for recursive use. (start_pinentry): Check and increment PINENTRY_ACTIVE for recursion. (agent_askpin): Follow the change of unlock_pinentry API. (agent_get_passphrase, agent_get_confirmation): Likewise. (agent_show_message, agent_popup_message_start): Likewise. (agent_popup_message_stop, agent_clear_passphrase): Likewise. -- We use the member PINENTRY_ACTIVE as a thread private object. It's only valid for a single thread at a time. It would be possible to have a thread shared object of PINENTRY_ACTIVE, keeping ENTRY_OWNER for distinguishing its owner (which is also a thread shared object). But, in this case, access to ENTRY_OWNER is tricky (only comparison to accessing thread would be OK with no lock), or we need to introduce another lock for accessing ENTRY_OWNER, which complicates the code too much. So, simply have a thread private object for recursive pinentry access. GnuPG-bug-id: 3190 Signed-off-by: NIIBE Yutaka <gniibe@fsij.org> (cherry picked from commit fb7828676cc2c01047498898378711e049f73fee)
This commit is contained in:
NIIBE Yutaka
Werner Koch
parent
4738256f2e
commit
3924e1442c
@ -255,8 +255,9 @@ struct server_control_s
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count. */
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unsigned long s2k_count;
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/* Recursion level of pinentry. */
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int pinentry_level;
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/* If pinentry is active for this thread. It can be more than 1,
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when pinentry is called recursively. */
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int pinentry_active;
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};
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@ -67,12 +67,6 @@ static struct
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} entry_features;
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/* The control variable of the connection owning the current pinentry.
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This is only valid if ENTRY_CTX is not NULL. Note, that we care
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only about the value of the pointer and that it should never be
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dereferenced. */
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static ctrl_t entry_owner;
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/* A mutex used to serialize access to the pinentry. */
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static npth_mutex_t entry_lock;
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@ -128,7 +122,7 @@ agent_query_dump_state (void)
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void
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agent_reset_query (ctrl_t ctrl)
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{
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if (entry_ctx && popup_tid && entry_owner == ctrl)
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if (entry_ctx && popup_tid && ctrl->pinentry_active)
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{
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agent_popup_message_stop (ctrl);
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}
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@ -140,7 +134,7 @@ agent_reset_query (ctrl_t ctrl)
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stalled pinentry does not block other threads. Fixme: We should
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have a timeout in Assuan for the disconnect operation. */
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static gpg_error_t
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unlock_pinentry (gpg_error_t rc)
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unlock_pinentry (ctrl_t ctrl, gpg_error_t rc)
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{
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assuan_context_t ctx = entry_ctx;
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int err;
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@ -177,9 +171,8 @@ unlock_pinentry (gpg_error_t rc)
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}
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}
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if (--entry_owner->pinentry_level == 0)
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if (--ctrl->pinentry_active == 0)
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{
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entry_owner = NULL;
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entry_ctx = NULL;
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err = npth_mutex_unlock (&entry_lock);
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if (err)
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@ -292,10 +285,11 @@ start_pinentry (ctrl_t ctrl)
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char *flavor_version;
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int err;
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if (entry_owner == ctrl)
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if (ctrl->pinentry_active)
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{
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/* Allow recursive use of pinentry. */
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ctrl->pinentry_level++;
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/* It's trying to use pinentry recursively. In this situation,
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the thread holds ENTRY_LOCK already. */
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ctrl->pinentry_active++;
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return 0;
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}
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@ -313,8 +307,6 @@ start_pinentry (ctrl_t ctrl)
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return rc;
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}
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entry_owner = ctrl;
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if (entry_ctx)
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return 0;
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@ -336,7 +328,7 @@ start_pinentry (ctrl_t ctrl)
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the Wine implementation does not flush stdin,stdout and stderr
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- see above. Let's try to ignore the error. */
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#ifndef HAVE_W32_SYSTEM
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return unlock_pinentry (tmperr);
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return unlock_pinentry (ctrl, tmperr);
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#endif
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}
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@ -383,7 +375,7 @@ start_pinentry (ctrl_t ctrl)
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return rc;
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}
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ctrl->pinentry_level = 1;
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ctrl->pinentry_active = 1;
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entry_ctx = ctx;
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/* We don't want to log the pinentry communication to make the logs
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@ -404,7 +396,7 @@ start_pinentry (ctrl_t ctrl)
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{
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log_error ("can't connect to the PIN entry module '%s': %s\n",
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full_pgmname, gpg_strerror (rc));
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return unlock_pinentry (gpg_error (GPG_ERR_NO_PIN_ENTRY));
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return unlock_pinentry (ctrl, gpg_error (GPG_ERR_NO_PIN_ENTRY));
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}
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if (DBG_IPC)
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@ -415,65 +407,65 @@ start_pinentry (ctrl_t ctrl)
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{
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char *optstr;
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if (asprintf (&optstr, "OPTION pinentry-user-data=%s", value) < 0 )
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return unlock_pinentry (out_of_core ());
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return unlock_pinentry (ctrl, out_of_core ());
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rc = assuan_transact (entry_ctx, optstr, NULL, NULL, NULL, NULL, NULL,
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NULL);
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xfree (optstr);
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if (rc && gpg_err_code (rc) != GPG_ERR_UNKNOWN_OPTION)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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}
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rc = assuan_transact (entry_ctx,
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opt.no_grab? "OPTION no-grab":"OPTION grab",
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NULL, NULL, NULL, NULL, NULL, NULL);
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if (rc)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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value = session_env_getenv (ctrl->session_env, "GPG_TTY");
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if (value)
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{
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char *optstr;
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if (asprintf (&optstr, "OPTION ttyname=%s", value) < 0 )
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return unlock_pinentry (out_of_core ());
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return unlock_pinentry (ctrl, out_of_core ());
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rc = assuan_transact (entry_ctx, optstr, NULL, NULL, NULL, NULL, NULL,
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NULL);
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xfree (optstr);
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if (rc)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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}
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value = session_env_getenv (ctrl->session_env, "TERM");
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if (value)
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{
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char *optstr;
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if (asprintf (&optstr, "OPTION ttytype=%s", value) < 0 )
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return unlock_pinentry (out_of_core ());
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return unlock_pinentry (ctrl, out_of_core ());
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rc = assuan_transact (entry_ctx, optstr, NULL, NULL, NULL, NULL, NULL,
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NULL);
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xfree (optstr);
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if (rc)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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}
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if (ctrl->lc_ctype)
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{
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char *optstr;
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if (asprintf (&optstr, "OPTION lc-ctype=%s", ctrl->lc_ctype) < 0 )
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return unlock_pinentry (out_of_core ());
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return unlock_pinentry (ctrl, out_of_core ());
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rc = assuan_transact (entry_ctx, optstr, NULL, NULL, NULL, NULL, NULL,
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NULL);
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xfree (optstr);
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if (rc)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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}
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if (ctrl->lc_messages)
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{
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char *optstr;
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if (asprintf (&optstr, "OPTION lc-messages=%s", ctrl->lc_messages) < 0 )
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return unlock_pinentry (out_of_core ());
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return unlock_pinentry (ctrl, out_of_core ());
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rc = assuan_transact (entry_ctx, optstr, NULL, NULL, NULL, NULL, NULL,
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NULL);
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xfree (optstr);
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if (rc)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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}
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@ -489,7 +481,7 @@ start_pinentry (ctrl_t ctrl)
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rc = assuan_transact (entry_ctx, "OPTION allow-external-password-cache",
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NULL, NULL, NULL, NULL, NULL, NULL);
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if (rc && gpg_err_code (rc) != GPG_ERR_UNKNOWN_OPTION)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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}
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if (opt.allow_emacs_pinentry)
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@ -499,7 +491,7 @@ start_pinentry (ctrl_t ctrl)
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rc = assuan_transact (entry_ctx, "OPTION allow-emacs-prompt",
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NULL, NULL, NULL, NULL, NULL, NULL);
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if (rc && gpg_err_code (rc) != GPG_ERR_UNKNOWN_OPTION)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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}
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@ -537,7 +529,7 @@ start_pinentry (ctrl_t ctrl)
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if (*s == '|' && (s2=strchr (s+1,'|')))
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s = s2+1;
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if (asprintf (&optstr, "OPTION default-%s=%s", tbl[idx].key, s) < 0 )
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return unlock_pinentry (out_of_core ());
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return unlock_pinentry (ctrl, out_of_core ());
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assuan_transact (entry_ctx, optstr, NULL, NULL, NULL, NULL, NULL,
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NULL);
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xfree (optstr);
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@ -664,8 +656,8 @@ start_pinentry (ctrl_t ctrl)
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rc = agent_inq_pinentry_launched (ctrl, pinentry_pid, flavor_version);
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if (gpg_err_code (rc) == GPG_ERR_CANCELED
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|| gpg_err_code (rc) == GPG_ERR_FULLY_CANCELED)
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return unlock_pinentry (gpg_err_make (GPG_ERR_SOURCE_DEFAULT,
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gpg_err_code (rc)));
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return unlock_pinentry (ctrl, gpg_err_make (GPG_ERR_SOURCE_DEFAULT,
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gpg_err_code (rc)));
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rc = 0;
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}
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@ -1035,18 +1027,18 @@ agent_askpin (ctrl_t ctrl,
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rc = assuan_transact (entry_ctx, line,
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NULL, NULL, NULL, NULL, NULL, NULL);
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if (rc && gpg_err_code (rc) != GPG_ERR_ASS_UNKNOWN_CMD)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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build_cmd_setdesc (line, DIM(line), desc_text);
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rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
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if (rc)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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snprintf (line, DIM(line), "SETPROMPT %s",
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prompt_text? prompt_text : is_pin? L_("PIN:") : L_("Passphrase:"));
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rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
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if (rc)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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/* If a passphrase quality indicator has been requested and a
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minimum passphrase length has not been disabled, send the command
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@ -1055,7 +1047,7 @@ agent_askpin (ctrl_t ctrl,
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{
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rc = setup_qualitybar (ctrl);
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if (rc)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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}
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if (initial_errtext)
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@ -1064,7 +1056,7 @@ agent_askpin (ctrl_t ctrl,
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rc = assuan_transact (entry_ctx, line,
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NULL, NULL, NULL, NULL, NULL, NULL);
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if (rc)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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}
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if (pininfo->with_repeat)
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@ -1095,7 +1087,7 @@ agent_askpin (ctrl_t ctrl,
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rc = assuan_transact (entry_ctx, line,
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NULL, NULL, NULL, NULL, NULL, NULL);
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if (rc)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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errtext = NULL;
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}
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@ -1105,7 +1097,7 @@ agent_askpin (ctrl_t ctrl,
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rc = assuan_transact (entry_ctx, line,
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NULL, NULL, NULL, NULL, NULL, NULL);
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if (rc)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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}
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saveflag = assuan_get_flag (entry_ctx, ASSUAN_CONFIDENTIAL);
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@ -1133,7 +1125,7 @@ agent_askpin (ctrl_t ctrl,
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errtext = is_pin? L_("PIN too long")
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: L_("Passphrase too long");
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else if (rc)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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if (!errtext && pininfo->min_digits)
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{
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@ -1159,7 +1151,7 @@ agent_askpin (ctrl_t ctrl,
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|| gpg_err_code (rc) == GPG_ERR_BAD_PIN)
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errtext = (is_pin? L_("Bad PIN") : L_("Bad Passphrase"));
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else if (rc)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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}
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if (!errtext)
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@ -1167,7 +1159,7 @@ agent_askpin (ctrl_t ctrl,
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if (pininfo->with_repeat
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&& (pinentry_status & PINENTRY_STATUS_PIN_REPEATED))
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pininfo->repeat_okay = 1;
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return unlock_pinentry (0); /* okay, got a PIN or passphrase */
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return unlock_pinentry (ctrl, 0); /* okay, got a PIN or passphrase */
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}
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if ((pinentry_status & PINENTRY_STATUS_PASSWORD_FROM_CACHE))
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@ -1176,7 +1168,7 @@ agent_askpin (ctrl_t ctrl,
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pininfo->failed_tries --;
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}
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return unlock_pinentry (gpg_error (pininfo->min_digits? GPG_ERR_BAD_PIN
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return unlock_pinentry (ctrl, gpg_error (pininfo->min_digits? GPG_ERR_BAD_PIN
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: GPG_ERR_BAD_PASSPHRASE));
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}
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@ -1242,7 +1234,7 @@ agent_get_passphrase (ctrl_t ctrl,
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rc = assuan_transact (entry_ctx, line,
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NULL, NULL, NULL, NULL, NULL, NULL);
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if (rc && gpg_err_code (rc) != GPG_ERR_ASS_UNKNOWN_CMD)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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if (desc)
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@ -1251,18 +1243,18 @@ agent_get_passphrase (ctrl_t ctrl,
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snprintf (line, DIM(line), "RESET");
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rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
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if (rc)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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snprintf (line, DIM(line), "SETPROMPT %s", prompt);
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rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
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if (rc)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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if (with_qualitybar && opt.min_passphrase_len)
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{
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rc = setup_qualitybar (ctrl);
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if (rc)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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}
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if (errtext)
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@ -1270,14 +1262,14 @@ agent_get_passphrase (ctrl_t ctrl,
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snprintf (line, DIM(line), "SETERROR %s", errtext);
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rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
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if (rc)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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}
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memset (&parm, 0, sizeof parm);
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parm.size = ASSUAN_LINELENGTH/2 - 5;
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parm.buffer = gcry_malloc_secure (parm.size+10);
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if (!parm.buffer)
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return unlock_pinentry (out_of_core ());
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return unlock_pinentry (ctrl, out_of_core ());
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saveflag = assuan_get_flag (entry_ctx, ASSUAN_CONFIDENTIAL);
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assuan_begin_confidential (entry_ctx);
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@ -1301,7 +1293,7 @@ agent_get_passphrase (ctrl_t ctrl,
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xfree (parm.buffer);
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else
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*retpass = parm.buffer;
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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}
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@ -1345,7 +1337,7 @@ agent_get_confirmation (ctrl_t ctrl,
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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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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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if (ok)
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{
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@ -1353,7 +1345,7 @@ agent_get_confirmation (ctrl_t ctrl,
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rc = assuan_transact (entry_ctx,
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line, NULL, NULL, NULL, NULL, NULL, NULL);
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if (rc)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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}
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if (notok)
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{
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@ -1376,7 +1368,7 @@ agent_get_confirmation (ctrl_t ctrl,
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NULL, NULL, NULL, NULL, NULL, NULL);
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}
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if (rc)
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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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}
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rc = assuan_transact (entry_ctx, "CONFIRM",
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@ -1384,7 +1376,7 @@ agent_get_confirmation (ctrl_t ctrl,
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if (rc && gpg_err_source (rc) && 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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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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}
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@ -1418,7 +1410,7 @@ agent_show_message (ctrl_t ctrl, const char *desc, const char *ok_btn)
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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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return unlock_pinentry (rc);
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return unlock_pinentry (ctrl, rc);
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if (ok_btn)
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{
|
||||
@ -1426,7 +1418,7 @@ agent_show_message (ctrl_t ctrl, const char *desc, const char *ok_btn)
|
||||
rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL,
|
||||
NULL, NULL, NULL);
|
||||
if (rc)
|
||||
return unlock_pinentry (rc);
|
||||
return unlock_pinentry (ctrl, rc);
|
||||
}
|
||||
|
||||
rc = assuan_transact (entry_ctx, "CONFIRM --one-button", NULL, NULL, NULL,
|
||||
@ -1434,7 +1426,7 @@ agent_show_message (ctrl_t ctrl, const char *desc, const char *ok_btn)
|
||||
if (rc && gpg_err_source (rc) && gpg_err_code (rc) == GPG_ERR_ASS_CANCELED)
|
||||
rc = gpg_err_make (gpg_err_source (rc), GPG_ERR_CANCELED);
|
||||
|
||||
return unlock_pinentry (rc);
|
||||
return unlock_pinentry (ctrl, rc);
|
||||
}
|
||||
|
||||
|
||||
@ -1482,19 +1474,19 @@ agent_popup_message_start (ctrl_t ctrl, const char *desc, const char *ok_btn)
|
||||
snprintf (line, DIM(line), "RESET");
|
||||
rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
|
||||
if (rc)
|
||||
return unlock_pinentry (rc);
|
||||
return unlock_pinentry (ctrl, rc);
|
||||
|
||||
if (ok_btn)
|
||||
{
|
||||
snprintf (line, DIM(line), "SETOK %s", ok_btn);
|
||||
rc = assuan_transact (entry_ctx, line, NULL,NULL,NULL,NULL,NULL,NULL);
|
||||
if (rc)
|
||||
return unlock_pinentry (rc);
|
||||
return unlock_pinentry (ctrl, rc);
|
||||
}
|
||||
|
||||
err = npth_attr_init (&tattr);
|
||||
if (err)
|
||||
return unlock_pinentry (gpg_error_from_errno (err));
|
||||
return unlock_pinentry (ctrl, gpg_error_from_errno (err));
|
||||
npth_attr_setdetachstate (&tattr, NPTH_CREATE_JOINABLE);
|
||||
|
||||
popup_finished = 0;
|
||||
@ -1505,7 +1497,7 @@ agent_popup_message_start (ctrl_t ctrl, const char *desc, const char *ok_btn)
|
||||
rc = gpg_error_from_errno (err);
|
||||
log_error ("error spawning popup message handler: %s\n",
|
||||
strerror (err) );
|
||||
return unlock_pinentry (rc);
|
||||
return unlock_pinentry (ctrl, rc);
|
||||
}
|
||||
npth_setname_np (popup_tid, "popup-message");
|
||||
|
||||
@ -1566,7 +1558,7 @@ agent_popup_message_stop (ctrl_t ctrl)
|
||||
memset (&popup_tid, '\0', sizeof (popup_tid));
|
||||
|
||||
/* Now we can close the connection. */
|
||||
unlock_pinentry (0);
|
||||
unlock_pinentry (ctrl, 0);
|
||||
}
|
||||
|
||||
int
|
||||
@ -1592,5 +1584,5 @@ agent_clear_passphrase (ctrl_t ctrl,
|
||||
rc = assuan_transact (entry_ctx, line,
|
||||
NULL, NULL, NULL, NULL, NULL, NULL);
|
||||
|
||||
return unlock_pinentry (rc);
|
||||
return unlock_pinentry (ctrl, rc);
|
||||
}
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user