diff --git a/agent/call-pinentry.c b/agent/call-pinentry.c index 585ddefac..ee617db53 100644 --- a/agent/call-pinentry.c +++ b/agent/call-pinentry.c @@ -1,2120 +1,2127 @@ /* call-pinentry.c - Spawn the pinentry to query stuff from the user * Copyright (C) 2001, 2002, 2004, 2007, 2008, * 2010 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 . */ #include #include #include #include #include #include #include #include #ifndef HAVE_W32_SYSTEM # include # include # include # include #endif #include #include "agent.h" #include #include "../common/sysutils.h" #include "../common/i18n.h" #include "../common/zb32.h" #ifdef _POSIX_OPEN_MAX #define MAX_OPEN_FDS _POSIX_OPEN_MAX #else #define MAX_OPEN_FDS 20 #endif /* Because access to the pinentry must be serialized (it is and shall be a global mutually exclusive dialog) we better timeout pending requests after some time. 1 minute seem to be a reasonable time. */ #define LOCK_TIMEOUT (1*60) /* Define the maximum tries to generate a pin for the GENPIN inquire */ #define MAX_GENPIN_TRIES 10 /* Define the number of characters to use for a generated pin */ #define DEFAULT_GENPIN_BYTES (128 / 8) /* The assuan context of the current pinentry. */ static assuan_context_t entry_ctx; /* A list of features of the current pinentry. */ static struct { /* The Pinentry support RS+US tabbing. This means that a RS (0x1e) * starts a new tabbing block in which a US (0x1f) followed by a * colon marks a colon. A pinentry can use this to pretty print * name value pairs. */ unsigned int tabbing:1; } entry_features; /* A mutex used to serialize access to the pinentry. */ static npth_mutex_t entry_lock; /* The thread ID of the popup working thread. */ static npth_t popup_tid; /* A flag used in communication between the popup working thread and its stop function. */ static int popup_finished; /* Data to be passed to our callbacks, */ struct entry_parm_s { int lines; size_t size; unsigned char *buffer; int status; unsigned int constraints_flags; }; /* This function must be called once to initialize this module. This has to be done before a second thread is spawned. We can't do the static initialization because Pth emulation code might not be able to do a static init; in particular, it is not possible for W32. */ void initialize_module_call_pinentry (void) { static int initialized; int err; if (!initialized) { err = npth_mutex_init (&entry_lock, NULL); if (err) log_fatal ("error initializing mutex: %s\n", strerror (err)); initialized = 1; } } /* This function may be called to print information pertaining to the current state of this module to the log. */ void agent_query_dump_state (void) { log_info ("agent_query_dump_state: entry_ctx=%p pid=%ld popup_tid=%p\n", entry_ctx, (long)assuan_get_pid (entry_ctx), (void*)popup_tid); } /* Called to make sure that a popup window owned by the current connection gets closed. */ void agent_reset_query (ctrl_t ctrl) { if (entry_ctx && popup_tid && ctrl->pinentry_active) { agent_popup_message_stop (ctrl); } } /* Unlock the pinentry so that another thread can start one and disconnect that pinentry - we do this after the unlock so that a stalled pinentry does not block other threads. Fixme: We should have a timeout in Assuan for the disconnect operation. */ static gpg_error_t unlock_pinentry (ctrl_t ctrl, gpg_error_t rc) { assuan_context_t ctx = entry_ctx; int err; if (rc) { if (DBG_IPC) log_debug ("error calling pinentry: %s <%s>\n", gpg_strerror (rc), gpg_strsource (rc)); /* Change the source of the error to pinentry so that the final consumer of the error code knows that the problem is with pinentry. For backward compatibility we do not do that for some common error codes. */ switch (gpg_err_code (rc)) { case GPG_ERR_NO_PIN_ENTRY: case GPG_ERR_CANCELED: case GPG_ERR_FULLY_CANCELED: case GPG_ERR_ASS_UNKNOWN_INQUIRE: case GPG_ERR_ASS_TOO_MUCH_DATA: case GPG_ERR_NO_PASSPHRASE: case GPG_ERR_BAD_PASSPHRASE: case GPG_ERR_BAD_PIN: break; case GPG_ERR_CORRUPTED_PROTECTION: /* This comes from gpg-agent. */ break; default: rc = gpg_err_make (GPG_ERR_SOURCE_PINENTRY, gpg_err_code (rc)); break; } } if (--ctrl->pinentry_active == 0) { entry_ctx = NULL; err = npth_mutex_unlock (&entry_lock); if (err) { log_error ("failed to release the entry lock: %s\n", strerror (err)); if (!rc) rc = gpg_error_from_errno (err); } assuan_release (ctx); } return rc; } /* Helper for at_fork_cb which can also be called by the parent to * show shich envvars will be set. */ static void atfork_core (ctrl_t ctrl, int debug_mode) { int iterator = 0; const char *name, *assname, *value; while ((name = session_env_list_stdenvnames (&iterator, &assname))) { /* For all new envvars (!ASSNAME) and the two medium old ones * which do have an assuan name but are conveyed using * environment variables, update the environment of the forked - * process. */ + * process. We also pass DISPLAY despite that --display is also + * used when exec-ing the pinentry. The reason is that for + * example the qt5ct tool does not have any arguments and thus + * relies on the DISPLAY envvar. The use case here is a global + * envvar like "QT_QPA_PLATFORMTHEME=qt5ct" which for example is + * useful when using the Qt pinentry under GNOME or XFCE. + */ if (!assname + || (!opt.keep_display && !strcmp (name, "DISPLAY")) || !strcmp (name, "XAUTHORITY") || !strcmp (name, "PINENTRY_USER_DATA")) { value = session_env_getenv (ctrl->session_env, name); if (value) { if (debug_mode) log_debug ("pinentry: atfork used setenv(%s,%s)\n",name,value); else gnupg_setenv (name, value, 1); } } } } /* To make sure we leave no secrets in our image after forking of the pinentry, we use this callback. */ static void atfork_cb (void *opaque, int where) { ctrl_t ctrl = opaque; if (!where) { gcry_control (GCRYCTL_TERM_SECMEM); atfork_core (ctrl, 0); } } /* Status line callback for the FEATURES status. */ static gpg_error_t getinfo_features_cb (void *opaque, const char *line) { const char *args; char **tokens; int i; (void)opaque; if ((args = has_leading_keyword (line, "FEATURES"))) { tokens = strtokenize (args, " "); if (!tokens) return gpg_error_from_syserror (); for (i=0; tokens[i]; i++) if (!strcmp (tokens[i], "tabbing")) entry_features.tabbing = 1; xfree (tokens); } return 0; } static gpg_error_t getinfo_pid_cb (void *opaque, const void *buffer, size_t length) { unsigned long *pid = opaque; char pidbuf[50]; /* There is only the pid in the server's response. */ if (length >= sizeof pidbuf) length = sizeof pidbuf -1; if (length) { strncpy (pidbuf, buffer, length); pidbuf[length] = 0; *pid = strtoul (pidbuf, NULL, 10); } return 0; } /* Fork off the pin entry if this has not already been done. Note, that this function must always be used to acquire the lock for the pinentry - we will serialize _all_ pinentry calls. */ static gpg_error_t start_pinentry (ctrl_t ctrl) { int rc = 0; const char *full_pgmname; const char *pgmname; assuan_context_t ctx; const char *argv[5]; assuan_fd_t no_close_list[3]; int i; const char *tmpstr; unsigned long pinentry_pid; const char *value; struct timespec abstime; char *flavor_version; int err; if (ctrl->pinentry_active) { /* It's trying to use pinentry recursively. In this situation, the thread holds ENTRY_LOCK already. */ ctrl->pinentry_active++; return 0; } npth_clock_gettime (&abstime); abstime.tv_sec += LOCK_TIMEOUT; err = npth_mutex_timedlock (&entry_lock, &abstime); if (err) { if (err == ETIMEDOUT) rc = gpg_error (GPG_ERR_TIMEOUT); else rc = gpg_error_from_errno (rc); log_error (_("failed to acquire the pinentry lock: %s\n"), gpg_strerror (rc)); return rc; } if (entry_ctx) return 0; if (opt.verbose) log_info ("starting a new PIN Entry\n"); #ifdef HAVE_W32_SYSTEM fflush (stdout); fflush (stderr); #endif if (fflush (NULL)) { #ifndef HAVE_W32_SYSTEM gpg_error_t tmperr = gpg_error (gpg_err_code_from_errno (errno)); #endif log_error ("error flushing pending output: %s\n", strerror (errno)); /* At least Windows XP fails here with EBADF. According to docs and Wine an fflush(NULL) is the same as _flushall. However the Wine implementation does not flush stdin,stdout and stderr - see above. Let's try to ignore the error. */ #ifndef HAVE_W32_SYSTEM return unlock_pinentry (ctrl, tmperr); #endif } full_pgmname = opt.pinentry_program; if (!full_pgmname || !*full_pgmname) full_pgmname = gnupg_module_name (GNUPG_MODULE_NAME_PINENTRY); if ( !(pgmname = strrchr (full_pgmname, '/'))) pgmname = full_pgmname; else pgmname++; /* OS X needs the entire file name in argv[0], so that it can locate the resource bundle. For other systems we stick to the usual convention of supplying only the name of the program. */ #ifdef __APPLE__ argv[0] = full_pgmname; #else /*!__APPLE__*/ argv[0] = pgmname; #endif /*__APPLE__*/ if (!opt.keep_display && (value = session_env_getenv (ctrl->session_env, "DISPLAY"))) { argv[1] = "--display"; argv[2] = value; argv[3] = NULL; } else argv[1] = NULL; i=0; if (!opt.running_detached) { if (log_get_fd () != -1) no_close_list[i++] = assuan_fd_from_posix_fd (log_get_fd ()); no_close_list[i++] = assuan_fd_from_posix_fd (fileno (stderr)); } no_close_list[i] = ASSUAN_INVALID_FD; rc = assuan_new (&ctx); if (rc) { log_error ("can't allocate assuan context: %s\n", gpg_strerror (rc)); return rc; } ctrl->pinentry_active = 1; entry_ctx = ctx; /* We don't want to log the pinentry communication to make the logs easier to read. We might want to add a new debug option to enable pinentry logging. */ #ifdef ASSUAN_NO_LOGGING assuan_set_flag (ctx, ASSUAN_NO_LOGGING, !opt.debug_pinentry); #endif /* Connect to the pinentry and perform initial handshaking. Note that atfork is used to change the environment for pinentry. We start the server in detached mode to suppress the console window under Windows. */ rc = assuan_pipe_connect (entry_ctx, full_pgmname, argv, no_close_list, atfork_cb, ctrl, ASSUAN_PIPE_CONNECT_DETACHED); if (rc) { log_error ("can't connect to the PIN entry module '%s': %s\n", full_pgmname, gpg_strerror (rc)); return unlock_pinentry (ctrl, gpg_error (GPG_ERR_NO_PIN_ENTRY)); } if (DBG_IPC) log_debug ("connection to PIN entry established\n"); if (opt.debug_pinentry) atfork_core (ctrl, 1); value = session_env_getenv (ctrl->session_env, "PINENTRY_USER_DATA"); if (value != NULL) { char *optstr; if (asprintf (&optstr, "OPTION pinentry-user-data=%s", value) < 0 ) return unlock_pinentry (ctrl, out_of_core ()); rc = assuan_transact (entry_ctx, optstr, NULL, NULL, NULL, NULL, NULL, NULL); xfree (optstr); if (rc && gpg_err_code (rc) != GPG_ERR_UNKNOWN_OPTION) return unlock_pinentry (ctrl, rc); } rc = assuan_transact (entry_ctx, opt.no_grab? "OPTION no-grab":"OPTION grab", NULL, NULL, NULL, NULL, NULL, NULL); if (rc) { if (gpg_err_code (rc) == GPG_ERR_NOT_SUPPORTED || gpg_err_code (rc) == GPG_ERR_UNKNOWN_OPTION) { if (opt.verbose) log_info ("Option no-grab/grab is ignored by pinentry.\n"); /* Keep going even if the feature is not supported. */ } else return unlock_pinentry (ctrl, rc); } value = session_env_getenv (ctrl->session_env, "GPG_TTY"); if (value) { char *optstr; if (asprintf (&optstr, "OPTION ttyname=%s", value) < 0 ) return unlock_pinentry (ctrl, out_of_core ()); rc = assuan_transact (entry_ctx, optstr, NULL, NULL, NULL, NULL, NULL, NULL); xfree (optstr); if (rc) return unlock_pinentry (ctrl, rc); } value = session_env_getenv (ctrl->session_env, "TERM"); if (value && *value) { char *optstr; if (asprintf (&optstr, "OPTION ttytype=%s", value) < 0 ) return unlock_pinentry (ctrl, out_of_core ()); rc = assuan_transact (entry_ctx, optstr, NULL, NULL, NULL, NULL, NULL, NULL); xfree (optstr); if (rc) return unlock_pinentry (ctrl, rc); } if (ctrl->lc_ctype) { char *optstr; if (asprintf (&optstr, "OPTION lc-ctype=%s", ctrl->lc_ctype) < 0 ) return unlock_pinentry (ctrl, out_of_core ()); rc = assuan_transact (entry_ctx, optstr, NULL, NULL, NULL, NULL, NULL, NULL); xfree (optstr); if (rc) return unlock_pinentry (ctrl, rc); } if (ctrl->lc_messages) { char *optstr; if (asprintf (&optstr, "OPTION lc-messages=%s", ctrl->lc_messages) < 0 ) return unlock_pinentry (ctrl, out_of_core ()); rc = assuan_transact (entry_ctx, optstr, NULL, NULL, NULL, NULL, NULL, NULL); xfree (optstr); if (rc) return unlock_pinentry (ctrl, rc); } if (opt.allow_external_cache) { /* Indicate to the pinentry that it may read from an external cache. It is essential that the pinentry respect this. If the cached password is not up to date and retry == 1, then, using a version of GPG Agent that doesn't support this, won't issue another pin request and the user won't get a chance to correct the password. */ rc = assuan_transact (entry_ctx, "OPTION allow-external-password-cache", NULL, NULL, NULL, NULL, NULL, NULL); if (rc && gpg_err_code (rc) != GPG_ERR_UNKNOWN_OPTION) return unlock_pinentry (ctrl, rc); } if (opt.allow_emacs_pinentry) { /* Indicate to the pinentry that it may read passphrase through Emacs minibuffer, if possible. */ rc = assuan_transact (entry_ctx, "OPTION allow-emacs-prompt", NULL, NULL, NULL, NULL, NULL, NULL); if (rc && gpg_err_code (rc) != GPG_ERR_UNKNOWN_OPTION) return unlock_pinentry (ctrl, rc); } { /* Provide a few default strings for use by the pinentries. This * may help a pinentry to avoid implementing localization code. * Note that gpg-agent has been set to utf-8 so that the strings * are in the expected encoding. */ static const struct { const char *key, *value; int what; } tbl[] = { /* TRANSLATORS: These are labels for buttons etc as used in * Pinentries. In your translation copy the text before the * second vertical bar verbatim; translate only the following * text. An underscore indicates that the next letter should be * used as an accelerator. Double the underscore to have * pinentry display a literal underscore. */ { "ok", N_("|pinentry-label|_OK") }, { "cancel", N_("|pinentry-label|_Cancel") }, { "yes", N_("|pinentry-label|_Yes") }, { "no", N_("|pinentry-label|_No") }, { "prompt", N_("|pinentry-label|PIN:") }, { "pwmngr", N_("|pinentry-label|_Save in password manager"), 1 }, { "cf-visi",N_("Do you really want to make your " "passphrase visible on the screen?") }, { "tt-visi",N_("|pinentry-tt|Make passphrase visible") }, { "tt-hide",N_("|pinentry-tt|Hide passphrase") }, { "capshint", N_("Caps Lock is on") }, { NULL, NULL} }; char *optstr; int idx; const char *s, *s2; for (idx=0; tbl[idx].key; idx++) { if (!opt.allow_external_cache && tbl[idx].what == 1) continue; /* No need for it. */ s = L_(tbl[idx].value); if (*s == '|' && (s2=strchr (s+1,'|'))) s = s2+1; if (asprintf (&optstr, "OPTION default-%s=%s", tbl[idx].key, s) < 0 ) return unlock_pinentry (ctrl, out_of_core ()); assuan_transact (entry_ctx, optstr, NULL, NULL, NULL, NULL, NULL, NULL); xfree (optstr); } } /* Tell the pinentry that we would prefer that the given character is used as the invisible character by the entry widget. */ if (opt.pinentry_invisible_char) { char *optstr; if ((optstr = xtryasprintf ("OPTION invisible-char=%s", opt.pinentry_invisible_char))) { assuan_transact (entry_ctx, optstr, NULL, NULL, NULL, NULL, NULL, NULL); /* We ignore errors because this is just a fancy thing and older pinentries do not support this feature. */ xfree (optstr); } } if (opt.pinentry_timeout) { char *optstr; if ((optstr = xtryasprintf ("SETTIMEOUT %lu", opt.pinentry_timeout))) { assuan_transact (entry_ctx, optstr, NULL, NULL, NULL, NULL, NULL, NULL); /* We ignore errors because this is just a fancy thing. */ xfree (optstr); } } /* Tell the pinentry the name of a file it shall touch after having messed with the tty. This is optional and only supported by newer pinentries and thus we do no error checking. */ tmpstr = opt.pinentry_touch_file; if (tmpstr && !strcmp (tmpstr, "/dev/null")) tmpstr = NULL; else if (!tmpstr) tmpstr = get_agent_socket_name (); if (tmpstr) { char *optstr; if (asprintf (&optstr, "OPTION touch-file=%s", tmpstr ) < 0 ) ; else { assuan_transact (entry_ctx, optstr, NULL, NULL, NULL, NULL, NULL, NULL); xfree (optstr); } } /* Tell Pinentry about our client. */ if (ctrl->client_pid) { char *optstr; const char *nodename = ""; #ifndef HAVE_W32_SYSTEM struct utsname utsbuf; if (!uname (&utsbuf)) nodename = utsbuf.nodename; #endif /*!HAVE_W32_SYSTEM*/ if ((optstr = xtryasprintf ("OPTION owner=%lu/%d %s", ctrl->client_pid, ctrl->client_uid, nodename))) { assuan_transact (entry_ctx, optstr, NULL, NULL, NULL, NULL, NULL, NULL); /* We ignore errors because this is just a fancy thing and older pinentries do not support this feature. */ xfree (optstr); } } /* Ask the pinentry for its version and flavor and store that as a * string in MB. This information is useful for helping users to * figure out Pinentry problems. Note that "flavor" may also return * a status line with the features; we use a dedicated handler for * that. */ { membuf_t mb; init_membuf (&mb, 256); if (assuan_transact (entry_ctx, "GETINFO flavor", put_membuf_cb, &mb, NULL, NULL, getinfo_features_cb, NULL)) put_membuf_str (&mb, "unknown"); put_membuf_str (&mb, " "); if (assuan_transact (entry_ctx, "GETINFO version", put_membuf_cb, &mb, NULL, NULL, NULL, NULL)) put_membuf_str (&mb, "unknown"); put_membuf_str (&mb, " "); if (assuan_transact (entry_ctx, "GETINFO ttyinfo", put_membuf_cb, &mb, NULL, NULL, NULL, NULL)) put_membuf_str (&mb, "? ? ?"); put_membuf (&mb, "", 1); flavor_version = get_membuf (&mb, NULL); } /* Now ask the Pinentry for its PID. If the Pinentry is new enough it will send the pid back and we will use an inquire to notify our client. The client may answer the inquiry either with END or with CAN to cancel the pinentry. */ rc = assuan_transact (entry_ctx, "GETINFO pid", getinfo_pid_cb, &pinentry_pid, NULL, NULL, NULL, NULL); if (rc) { log_info ("You may want to update to a newer pinentry\n"); rc = 0; } else if (!rc && pinentry_pid == (unsigned long)(-1L)) log_error ("pinentry did not return a PID\n"); else { rc = agent_inq_pinentry_launched (ctrl, pinentry_pid, flavor_version); if (gpg_err_code (rc) == GPG_ERR_CANCELED || gpg_err_code (rc) == GPG_ERR_FULLY_CANCELED) return unlock_pinentry (ctrl, gpg_err_make (GPG_ERR_SOURCE_DEFAULT, gpg_err_code (rc))); rc = 0; } xfree (flavor_version); return rc; } /* Returns True if the pinentry is currently active. If WAITSECONDS is greater than zero the function will wait for this many seconds before returning. */ int pinentry_active_p (ctrl_t ctrl, int waitseconds) { int err; (void)ctrl; if (waitseconds > 0) { struct timespec abstime; int rc; npth_clock_gettime (&abstime); abstime.tv_sec += waitseconds; err = npth_mutex_timedlock (&entry_lock, &abstime); if (err) { if (err == ETIMEDOUT) rc = gpg_error (GPG_ERR_TIMEOUT); else rc = gpg_error (GPG_ERR_INTERNAL); return rc; } } else { err = npth_mutex_trylock (&entry_lock); if (err) return gpg_error (GPG_ERR_LOCKED); } err = npth_mutex_unlock (&entry_lock); if (err) log_error ("failed to release the entry lock at %d: %s\n", __LINE__, strerror (errno)); return 0; } static gpg_error_t getpin_cb (void *opaque, const void *buffer, size_t length) { struct entry_parm_s *parm = opaque; if (!buffer) return 0; /* we expect the pin to fit on one line */ if (parm->lines || length >= parm->size) return gpg_error (GPG_ERR_ASS_TOO_MUCH_DATA); /* fixme: we should make sure that the assuan buffer is allocated in secure memory or read the response byte by byte */ memcpy (parm->buffer, buffer, length); parm->buffer[length] = 0; parm->lines++; return 0; } static int all_digitsp( const char *s) { for (; *s && *s >= '0' && *s <= '9'; s++) ; return !*s; } /* Return a new malloced string by unescaping the string S. Escaping is percent escaping and '+'/space mapping. A binary Nul will silently be replaced by a 0xFF. Function returns NULL to indicate an out of memory status. Parsing stops at the end of the string or a white space character. */ static char * unescape_passphrase_string (const unsigned char *s) { char *buffer, *d; buffer = d = xtrymalloc_secure (strlen ((const char*)s)+1); if (!buffer) return NULL; while (*s && !spacep (s)) { if (*s == '%' && s[1] && s[2]) { s++; *d = xtoi_2 (s); if (!*d) *d = '\xff'; d++; s += 2; } else if (*s == '+') { *d++ = ' '; s++; } else *d++ = *s++; } *d = 0; return buffer; } /* Estimate the quality of the passphrase PW and return a value in the range 0..100. */ static int estimate_passphrase_quality (const char *pw) { int goodlength = opt.min_passphrase_len + opt.min_passphrase_len/3; int length; const char *s; if (goodlength < 1) return 0; for (length = 0, s = pw; *s; s++) if (!spacep (s)) length ++; if (length > goodlength) return 100; return ((length*10) / goodlength)*10; } /* Generate a random passphrase in zBase32 encoding (RFC-6189) to be * used by pinetry to suggest a passphrase. */ static char * generate_pin (void) { size_t nbytes = opt.min_passphrase_len; void *rand; char *generated; if (nbytes < 8) { nbytes = DEFAULT_GENPIN_BYTES; } rand = gcry_random_bytes_secure (nbytes, GCRY_STRONG_RANDOM); if (!rand) { log_error ("failed to generate random pin\n"); return NULL; } generated = zb32_encode (rand, nbytes * 8); gcry_free (rand); return generated; } /* Handle inquiries. */ struct inq_cb_parm_s { assuan_context_t ctx; unsigned int flags; /* CHECK_CONSTRAINTS_... */ }; static gpg_error_t inq_cb (void *opaque, const char *line) { struct inq_cb_parm_s *parm = opaque; gpg_error_t err; const char *s; char *pin; if ((s = has_leading_keyword (line, "QUALITY"))) { char numbuf[20]; int percent; pin = unescape_passphrase_string (s); if (!pin) err = gpg_error_from_syserror (); else { percent = estimate_passphrase_quality (pin); if (check_passphrase_constraints (NULL, pin, parm->flags, NULL)) percent = -percent; snprintf (numbuf, sizeof numbuf, "%d", percent); err = assuan_send_data (parm->ctx, numbuf, strlen (numbuf)); xfree (pin); } } else if ((s = has_leading_keyword (line, "CHECKPIN"))) { char *errtext = NULL; size_t errtextlen; if (!opt.enforce_passphrase_constraints) { log_error ("unexpected inquiry 'CHECKPIN' without enforced " "passphrase constraints\n"); err = gpg_error (GPG_ERR_ASS_UNEXPECTED_CMD); goto leave; } pin = unescape_passphrase_string (s); if (!pin) err = gpg_error_from_syserror (); else { if (check_passphrase_constraints (NULL, pin, parm->flags, &errtext)) { if (errtext) { /* Unescape the percent-escaped errtext because assuan_send_data escapes it again. */ errtextlen = percent_unescape_inplace (errtext, 0); err = assuan_send_data (parm->ctx, errtext, errtextlen); } else { log_error ("passphrase check failed without error text\n"); err = gpg_error (GPG_ERR_GENERAL); } } else { err = assuan_send_data (parm->ctx, NULL, 0); } xfree (errtext); xfree (pin); } } else if ((s = has_leading_keyword (line, "GENPIN"))) { int tries; for (tries = 0; tries < MAX_GENPIN_TRIES; tries ++) { pin = generate_pin (); if (!pin) { log_error ("failed to generate a passphrase\n"); err = gpg_error (GPG_ERR_GENERAL); goto leave; } if (!check_passphrase_constraints (NULL, pin, parm->flags, NULL)) { assuan_begin_confidential (parm->ctx); err = assuan_send_data (parm->ctx, pin, strlen (pin)); assuan_end_confidential (parm->ctx); xfree (pin); goto leave; } xfree (pin); } log_error ("failed to generate a passphrase after %i tries\n", MAX_GENPIN_TRIES); err = gpg_error (GPG_ERR_GENERAL); } else { log_error ("unsupported inquiry '%s' from pinentry\n", line); err = gpg_error (GPG_ERR_ASS_UNKNOWN_INQUIRE); } leave: return err; } /* Helper to setup pinentry for genpin action. */ static gpg_error_t setup_genpin (ctrl_t ctrl) { gpg_error_t err; char line[ASSUAN_LINELENGTH]; char *tmpstr, *tmpstr2; const char *tooltip; (void)ctrl; /* TRANSLATORS: This string is displayed by Pinentry as the label for generating a passphrase. */ tmpstr = try_percent_escape (L_("Suggest"), "\t\r\n\f\v"); snprintf (line, DIM(line), "SETGENPIN %s", tmpstr? tmpstr:""); xfree (tmpstr); err = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (gpg_err_code (err) == 103 /*(Old assuan error code)*/ || gpg_err_code (err) == GPG_ERR_ASS_UNKNOWN_CMD) ; /* Ignore Unknown Command from old Pinentry versions. */ else if (err) return err; tmpstr2 = gnupg_get_help_string ("pinentry.genpin.tooltip", 0); if (tmpstr2) tooltip = tmpstr2; else { /* TRANSLATORS: This string is a tooltip, shown by pinentry when hovering over the generate button. Please use an appropriate string to describe what this is about. The length of the tooltip is limited to about 900 characters. If you do not translate this entry, a default English text (see source) will be used. The strcmp thingy is there to detect a non-translated string. */ tooltip = L_("pinentry.genpin.tooltip"); if (!strcmp ("pinentry.genpin.tooltip", tooltip)) tooltip = "Suggest a random passphrase."; } tmpstr = try_percent_escape (tooltip, "\t\r\n\f\v"); xfree (tmpstr2); snprintf (line, DIM(line), "SETGENPIN_TT %s", tmpstr? tmpstr:""); xfree (tmpstr); err = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (gpg_err_code (err) == 103 /*(Old assuan error code)*/ || gpg_err_code (err) == GPG_ERR_ASS_UNKNOWN_CMD) ; /* Ignore Unknown Command from old pinentry versions. */ else if (err) return err; return 0; } /* Helper to setup pinentry for formatted passphrase. */ static gpg_error_t setup_formatted_passphrase (ctrl_t ctrl) { static const struct { const char *key, *help_id, *value; } tbl[] = { /* TRANSLATORS: This is a text shown by pinentry if the option for formatted passphrase is enabled. The length is limited to about 900 characters. */ { "hint", "pinentry.formatted_passphrase.hint", N_("Note: The blanks are not part of the passphrase.") }, { NULL, NULL } }; gpg_error_t rc; char line[ASSUAN_LINELENGTH]; int idx; char *tmpstr; const char *s; (void)ctrl; if (opt.pinentry_formatted_passphrase) { snprintf (line, DIM(line), "OPTION formatted-passphrase"); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (rc && gpg_err_code (rc) != GPG_ERR_UNKNOWN_OPTION) return rc; for (idx=0; tbl[idx].key; idx++) { tmpstr = gnupg_get_help_string (tbl[idx].help_id, 0); if (tmpstr) s = tmpstr; else s = L_(tbl[idx].value); snprintf (line, DIM(line), "OPTION formatted-passphrase-%s=%s", tbl[idx].key, s); xfree (tmpstr); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (rc && gpg_err_code (rc) != GPG_ERR_UNKNOWN_OPTION) return rc; } } return 0; } /* Helper to setup pinentry for enforced passphrase constraints. */ static gpg_error_t setup_enforced_constraints (ctrl_t ctrl) { static const struct { const char *key, *help_id, *value; } tbl[] = { { "hint-short", "pinentry.constraints.hint.short", NULL }, { "hint-long", "pinentry.constraints.hint.long", NULL }, /* TRANSLATORS: This is a text shown by pinentry as title of a dialog telling the user that the entered new passphrase does not satisfy the passphrase constraints. Please keep it short. */ { "error-title", NULL, N_("Passphrase Not Allowed") }, { NULL, NULL } }; gpg_error_t rc; char line[ASSUAN_LINELENGTH]; int idx; char *tmpstr; const char *s; char *escapedstr; (void)ctrl; if (opt.enforce_passphrase_constraints) { snprintf (line, DIM(line), "OPTION constraints-enforce"); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (rc && gpg_err_code (rc) != GPG_ERR_UNKNOWN_OPTION) return rc; for (idx=0; tbl[idx].key; idx++) { tmpstr = gnupg_get_help_string (tbl[idx].help_id, 0); if (tmpstr) s = tmpstr; else if (tbl[idx].value) s = L_(tbl[idx].value); else { log_error ("no help string found for %s\n", tbl[idx].help_id); continue; } escapedstr = try_percent_escape (s, "\t\r\n\f\v"); xfree (tmpstr); snprintf (line, DIM(line), "OPTION constraints-%s=%s", tbl[idx].key, escapedstr); xfree (escapedstr); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (rc && gpg_err_code (rc) != GPG_ERR_UNKNOWN_OPTION) return rc; } } return 0; } /* Helper for agent_askpin and agent_get_passphrase. */ static gpg_error_t setup_qualitybar (ctrl_t ctrl) { int rc; char line[ASSUAN_LINELENGTH]; char *tmpstr, *tmpstr2; const char *tooltip; (void)ctrl; /* TRANSLATORS: This string is displayed by Pinentry as the label for the quality bar. */ tmpstr = try_percent_escape (L_("Quality:"), "\t\r\n\f\v"); snprintf (line, DIM(line), "SETQUALITYBAR %s", tmpstr? tmpstr:""); xfree (tmpstr); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (rc == 103 /*(Old assuan error code)*/ || gpg_err_code (rc) == GPG_ERR_ASS_UNKNOWN_CMD) ; /* Ignore Unknown Command from old Pinentry versions. */ else if (rc) return rc; tmpstr2 = gnupg_get_help_string ("pinentry.qualitybar.tooltip", 0); if (tmpstr2) tooltip = tmpstr2; else { /* TRANSLATORS: This string is a tooltip, shown by pinentry when hovering over the quality bar. Please use an appropriate string to describe what this is about. The length of the tooltip is limited to about 900 characters. If you do not translate this entry, a default english text (see source) will be used. */ tooltip = L_("pinentry.qualitybar.tooltip"); if (!strcmp ("pinentry.qualitybar.tooltip", tooltip)) tooltip = ("The quality of the text entered above.\n" "Please ask your administrator for " "details about the criteria."); } tmpstr = try_percent_escape (tooltip, "\t\r\n\f\v"); xfree (tmpstr2); snprintf (line, DIM(line), "SETQUALITYBAR_TT %s", tmpstr? tmpstr:""); xfree (tmpstr); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (rc == 103 /*(Old assuan error code)*/ || gpg_err_code (rc) == GPG_ERR_ASS_UNKNOWN_CMD) ; /* Ignore Unknown Command from old pinentry versions. */ else if (rc) return rc; return 0; } /* Check the button_info line for a close action. Also check for the PIN_REPEATED flag. */ static gpg_error_t pinentry_status_cb (void *opaque, const char *line) { unsigned int *flag = opaque; const char *args; if ((args = has_leading_keyword (line, "BUTTON_INFO"))) { if (!strcmp (args, "close")) *flag |= PINENTRY_STATUS_CLOSE_BUTTON; } else if (has_leading_keyword (line, "PIN_REPEATED")) { *flag |= PINENTRY_STATUS_PIN_REPEATED; } else if (has_leading_keyword (line, "PASSWORD_FROM_CACHE")) { *flag |= PINENTRY_STATUS_PASSWORD_FROM_CACHE; } return 0; } /* Build a SETDESC command line. This is a dedicated function so that * it can remove control characters which are not supported by the * current Pinentry. */ static void build_cmd_setdesc (char *line, size_t linelen, const char *desc) { char *src, *dst; snprintf (line, linelen, "SETDESC %s", desc); if (!entry_features.tabbing) { /* Remove RS and US. */ for (src=dst=line; *src; src++) if (!strchr ("\x1e\x1f", *src)) *dst++ = *src; *dst = 0; } } /* Watch the socket's EOF condition, while checking finish of foreground thread. When EOF condition is detected, terminate the pinentry process behind the assuan pipe. */ static void * watch_sock (void *arg) { pid_t pid = assuan_get_pid (entry_ctx); while (1) { int err; fd_set fdset; struct timeval timeout = { 0, 500000 }; gnupg_fd_t sock = *(gnupg_fd_t *)arg; if (sock == GNUPG_INVALID_FD) return NULL; FD_ZERO (&fdset); FD_SET (FD2INT (sock), &fdset); err = npth_select (FD2INT (sock)+1, &fdset, NULL, NULL, &timeout); if (err < 0) { if (errno == EINTR) continue; else return NULL; } /* Possibly, it's EOF. */ if (err > 0) break; } if (pid == (pid_t)(-1)) ; /* No pid available can't send a kill. */ #ifdef HAVE_W32_SYSTEM /* Older versions of assuan set PID to 0 on Windows to indicate an invalid value. */ else if (pid != (pid_t) INVALID_HANDLE_VALUE && pid != 0) TerminateProcess ((HANDLE)pid, 1); #else else if (pid > 0) kill (pid, SIGINT); #endif return NULL; } static gpg_error_t watch_sock_start (gnupg_fd_t *sock_p, npth_t *thread_p) { npth_attr_t tattr; int err; err = npth_attr_init (&tattr); if (err) { log_error ("do_getpin: error npth_attr_init: %s\n", strerror (err)); return gpg_error_from_errno (err); } npth_attr_setdetachstate (&tattr, NPTH_CREATE_JOINABLE); err = npth_create (thread_p, &tattr, watch_sock, sock_p); npth_attr_destroy (&tattr); if (err) { log_error ("do_getpin: error spawning thread: %s\n", strerror (err)); return gpg_error_from_errno (err); } return 0; } static void watch_sock_end (gnupg_fd_t *sock_p, npth_t *thread_p) { int err; *sock_p = GNUPG_INVALID_FD; err = npth_join (*thread_p, NULL); if (err) log_error ("watch_sock_end: error joining thread: %s\n", strerror (err)); } /* Ask pinentry to get a pin by "GETPIN" command, spawning a thread detecting the socket's EOF. */ static gpg_error_t do_getpin (ctrl_t ctrl, struct entry_parm_s *parm) { gpg_error_t rc; int saveflag = assuan_get_flag (entry_ctx, ASSUAN_CONFIDENTIAL); gnupg_fd_t sock_watched = ctrl->thread_startup.fd; npth_t thread; struct inq_cb_parm_s inq_cb_parm; rc = watch_sock_start (&sock_watched, &thread); if (rc) return rc; inq_cb_parm.ctx = entry_ctx; inq_cb_parm.flags = parm->constraints_flags; assuan_begin_confidential (entry_ctx); rc = assuan_transact (entry_ctx, "GETPIN", getpin_cb, parm, inq_cb, &inq_cb_parm, pinentry_status_cb, &parm->status); assuan_set_flag (entry_ctx, ASSUAN_CONFIDENTIAL, saveflag); /* Most pinentries out in the wild return the old Assuan error code for canceled which gets translated to an assuan Cancel error and not to the code for a user cancel. Fix this here. */ 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); /* Change error code in case the window close button was clicked to cancel the operation. */ if ((parm->status & PINENTRY_STATUS_CLOSE_BUTTON) && gpg_err_code (rc) == GPG_ERR_CANCELED) rc = gpg_err_make (gpg_err_source (rc), GPG_ERR_FULLY_CANCELED); watch_sock_end (&sock_watched, &thread); return rc; } /* Call the Entry and ask for the PIN. We do check for a valid PIN number here and repeat it as long as we have invalid formed numbers. KEYINFO and CACHE_MODE are used to tell pinentry something about the key. */ gpg_error_t agent_askpin (ctrl_t ctrl, const char *desc_text, const char *prompt_text, const char *initial_errtext, struct pin_entry_info_s *pininfo, const char *keyinfo, cache_mode_t cache_mode) { gpg_error_t rc; char line[ASSUAN_LINELENGTH]; struct entry_parm_s parm; const char *errtext = NULL; int is_pin = 0; if (opt.batch) return 0; /* fixme: we should return BAD PIN */ if (ctrl->pinentry_mode != PINENTRY_MODE_ASK) { if (ctrl->pinentry_mode == PINENTRY_MODE_CANCEL) return gpg_error (GPG_ERR_CANCELED); if (ctrl->pinentry_mode == PINENTRY_MODE_LOOPBACK) { unsigned char *passphrase; size_t size; *pininfo->pin = 0; /* Reset the PIN. */ rc = pinentry_loopback (ctrl, "PASSPHRASE", &passphrase, &size, pininfo->max_length - 1); if (rc) return rc; memcpy(&pininfo->pin, passphrase, size); xfree(passphrase); pininfo->pin[size] = 0; if (pininfo->check_cb) { /* More checks by utilizing the optional callback. */ pininfo->cb_errtext = NULL; rc = pininfo->check_cb (pininfo); } return rc; } return gpg_error(GPG_ERR_NO_PIN_ENTRY); } if (!pininfo || pininfo->max_length < 1) return gpg_error (GPG_ERR_INV_VALUE); if (!desc_text && pininfo->min_digits) desc_text = L_("Please enter your PIN, so that the secret key " "can be unlocked for this session"); else if (!desc_text) desc_text = L_("Please enter your passphrase, so that the secret key " "can be unlocked for this session"); if (prompt_text) is_pin = !!strstr (prompt_text, "PIN"); else is_pin = desc_text && strstr (desc_text, "PIN"); rc = start_pinentry (ctrl); if (rc) return rc; /* If we have a KEYINFO string and are normal, user, or ssh cache mode, we tell that the Pinentry so it may use it for own caching purposes. Most pinentries won't have this implemented and thus we do not error out in this case. */ if (keyinfo && (cache_mode == CACHE_MODE_NORMAL || cache_mode == CACHE_MODE_USER || cache_mode == CACHE_MODE_SSH)) snprintf (line, DIM(line), "SETKEYINFO %c/%s", cache_mode == CACHE_MODE_USER? 'u' : cache_mode == CACHE_MODE_SSH? 's' : 'n', keyinfo); else snprintf (line, DIM(line), "SETKEYINFO --clear"); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (rc && gpg_err_code (rc) != GPG_ERR_ASS_UNKNOWN_CMD) return unlock_pinentry (ctrl, rc); build_cmd_setdesc (line, DIM(line), desc_text); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (rc) return unlock_pinentry (ctrl, rc); snprintf (line, DIM(line), "SETPROMPT %s", prompt_text? prompt_text : is_pin? L_("PIN:") : L_("Passphrase:")); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (rc) return unlock_pinentry (ctrl, rc); /* If a passphrase quality indicator has been requested and a minimum passphrase length has not been disabled, send the command to the pinentry. */ if (pininfo->with_qualitybar && opt.min_passphrase_len ) { rc = setup_qualitybar (ctrl); if (rc) return unlock_pinentry (ctrl, rc); } if (initial_errtext) { snprintf (line, DIM(line), "SETERROR %s", initial_errtext); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (rc) return unlock_pinentry (ctrl, rc); } if (pininfo->with_repeat) { snprintf (line, DIM(line), "SETREPEATERROR %s", L_("does not match - try again")); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (rc) pininfo->with_repeat = 0; /* Pinentry does not support it. */ } pininfo->repeat_okay = 0; pininfo->status = 0; for (;pininfo->failed_tries < pininfo->max_tries; pininfo->failed_tries++) { memset (&parm, 0, sizeof parm); parm.size = pininfo->max_length; *pininfo->pin = 0; /* Reset the PIN. */ parm.buffer = (unsigned char*)pininfo->pin; parm.constraints_flags = pininfo->constraints_flags; if (errtext) { /* TRANSLATORS: The string is appended to an error message in the pinentry. The %s is the actual error message, the two %d give the current and maximum number of tries. */ snprintf (line, DIM(line), L_("SETERROR %s (try %d of %d)"), errtext, pininfo->failed_tries+1, pininfo->max_tries); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (rc) return unlock_pinentry (ctrl, rc); errtext = NULL; } if (pininfo->with_repeat) { snprintf (line, DIM(line), "SETREPEAT %s", L_("Repeat:")); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (rc) return unlock_pinentry (ctrl, rc); } rc = do_getpin (ctrl, &parm); pininfo->status = parm.status; if (gpg_err_code (rc) == GPG_ERR_ASS_TOO_MUCH_DATA) errtext = is_pin? L_("PIN too long") : L_("Passphrase too long"); else if (rc) return unlock_pinentry (ctrl, rc); if (!errtext && pininfo->min_digits) { /* do some basic checks on the entered PIN. */ if (!all_digitsp (pininfo->pin)) errtext = L_("Invalid characters in PIN"); else if (pininfo->max_digits && strlen (pininfo->pin) > pininfo->max_digits) errtext = L_("PIN too long"); else if (strlen (pininfo->pin) < pininfo->min_digits) errtext = L_("PIN too short"); } if (!errtext && pininfo->check_cb) { /* More checks by utilizing the optional callback. */ pininfo->cb_errtext = NULL; rc = pininfo->check_cb (pininfo); /* When pinentry cache causes an error, return now. */ if (rc && (pininfo->status & PINENTRY_STATUS_PASSWORD_FROM_CACHE)) return unlock_pinentry (ctrl, rc); if (gpg_err_code (rc) == GPG_ERR_BAD_PASSPHRASE) { if (pininfo->cb_errtext) errtext = pininfo->cb_errtext; else if (gpg_err_code (rc) == GPG_ERR_BAD_PASSPHRASE || gpg_err_code (rc) == GPG_ERR_BAD_PIN) errtext = (is_pin? L_("Bad PIN") : L_("Bad Passphrase")); } else if (rc) return unlock_pinentry (ctrl, rc); } if (!errtext) { if (pininfo->with_repeat && (pininfo->status & PINENTRY_STATUS_PIN_REPEATED)) pininfo->repeat_okay = 1; return unlock_pinentry (ctrl, 0); /* okay, got a PIN or passphrase */ } if ((pininfo->status & PINENTRY_STATUS_PASSWORD_FROM_CACHE)) { /* The password was read from the cache. Don't count this against the retry count. */ pininfo->failed_tries --; } } return unlock_pinentry (ctrl, gpg_error (pininfo->min_digits? GPG_ERR_BAD_PIN : GPG_ERR_BAD_PASSPHRASE)); } /* Ask for the passphrase using the supplied arguments. The returned passphrase needs to be freed by the caller. PININFO is optional and can be used to have constraints checking while the pinentry dialog is open (like what we do in agent_askpin). This is very similar to agent_askpin and we should eventually merge the two functions. */ int agent_get_passphrase (ctrl_t ctrl, char **retpass, const char *desc, const char *prompt, const char *errtext, int with_qualitybar, const char *keyinfo, cache_mode_t cache_mode, struct pin_entry_info_s *pininfo) { int rc; int is_pin; char line[ASSUAN_LINELENGTH]; struct entry_parm_s parm; *retpass = NULL; if (opt.batch) return gpg_error (GPG_ERR_BAD_PASSPHRASE); if (ctrl->pinentry_mode != PINENTRY_MODE_ASK) { unsigned char *passphrase; size_t size; if (ctrl->pinentry_mode == PINENTRY_MODE_CANCEL) return gpg_error (GPG_ERR_CANCELED); if (ctrl->pinentry_mode == PINENTRY_MODE_LOOPBACK && pininfo) { *pininfo->pin = 0; /* Reset the PIN. */ rc = pinentry_loopback (ctrl, "PASSPHRASE", &passphrase, &size, pininfo->max_length - 1); if (rc) return rc; memcpy (&pininfo->pin, passphrase, size); wipememory (passphrase, size); xfree (passphrase); pininfo->pin[size] = 0; if (pininfo->check_cb) { /* More checks by utilizing the optional callback. */ pininfo->cb_errtext = NULL; rc = pininfo->check_cb (pininfo); } return rc; } else if (ctrl->pinentry_mode == PINENTRY_MODE_LOOPBACK) { /* Legacy variant w/o PININFO. */ return pinentry_loopback (ctrl, "PASSPHRASE", (unsigned char **)retpass, &size, MAX_PASSPHRASE_LEN); } return gpg_error (GPG_ERR_NO_PIN_ENTRY); } rc = start_pinentry (ctrl); if (rc) return rc; /* Set IS_PIN and if needed a default prompt. */ if (prompt) is_pin = !!strstr (prompt, "PIN"); else { is_pin = desc && strstr (desc, "PIN"); prompt = is_pin? L_("PIN:"): L_("Passphrase:"); } /* If we have a KEYINFO string and are normal, user, or ssh cache mode, we tell that the Pinentry so it may use it for own caching purposes. Most pinentries won't have this implemented and thus we do not error out in this case. */ if (keyinfo && (cache_mode == CACHE_MODE_NORMAL || cache_mode == CACHE_MODE_USER || cache_mode == CACHE_MODE_SSH)) snprintf (line, DIM(line), "SETKEYINFO %c/%s", cache_mode == CACHE_MODE_USER? 'u' : cache_mode == CACHE_MODE_SSH? 's' : 'n', keyinfo); else snprintf (line, DIM(line), "SETKEYINFO --clear"); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (rc && gpg_err_code (rc) != GPG_ERR_ASS_UNKNOWN_CMD) return unlock_pinentry (ctrl, rc); if (desc) build_cmd_setdesc (line, DIM(line), desc); else snprintf (line, DIM(line), "RESET"); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (rc) return unlock_pinentry (ctrl, rc); snprintf (line, DIM(line), "SETPROMPT %s", prompt); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (rc) return unlock_pinentry (ctrl, rc); if ((with_qualitybar || (pininfo && pininfo->with_qualitybar)) && opt.min_passphrase_len) { rc = setup_qualitybar (ctrl); if (rc) return unlock_pinentry (ctrl, rc); } if (errtext) { snprintf (line, DIM(line), "SETERROR %s", errtext); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (rc) return unlock_pinentry (ctrl, rc); } rc = setup_formatted_passphrase (ctrl); if (rc) return unlock_pinentry (ctrl, rc); if (!pininfo) { /* Legacy method without PININFO. */ memset (&parm, 0, sizeof parm); parm.size = ASSUAN_LINELENGTH/2 - 5; parm.buffer = gcry_malloc_secure (parm.size+10); if (!parm.buffer) return unlock_pinentry (ctrl, out_of_core ()); rc = do_getpin (ctrl, &parm); if (rc) xfree (parm.buffer); else *retpass = parm.buffer; return unlock_pinentry (ctrl, rc); } /* We got PININFO. */ if (pininfo->with_repeat) { snprintf (line, DIM(line), "SETREPEATERROR %s", L_("does not match - try again")); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (rc) pininfo->with_repeat = 0; /* Pinentry does not support it. */ (void)setup_genpin (ctrl); rc = setup_enforced_constraints (ctrl); if (rc) return unlock_pinentry (ctrl, rc); } pininfo->repeat_okay = 0; pininfo->status = 0; for (;pininfo->failed_tries < pininfo->max_tries; pininfo->failed_tries++) { memset (&parm, 0, sizeof parm); parm.size = pininfo->max_length; parm.buffer = (unsigned char*)pininfo->pin; *pininfo->pin = 0; /* Reset the PIN. */ if (errtext) { /* TRANSLATORS: The string is appended to an error message in the pinentry. The %s is the actual error message, the two %d give the current and maximum number of tries. */ snprintf (line, DIM(line), L_("SETERROR %s (try %d of %d)"), errtext, pininfo->failed_tries+1, pininfo->max_tries); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (rc) return unlock_pinentry (ctrl, rc); errtext = NULL; } if (pininfo->with_repeat) { snprintf (line, DIM(line), "SETREPEAT %s", L_("Repeat:")); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (rc) return unlock_pinentry (ctrl, rc); } rc = do_getpin (ctrl, &parm); pininfo->status = parm.status; if (gpg_err_code (rc) == GPG_ERR_ASS_TOO_MUCH_DATA) errtext = is_pin? L_("PIN too long") : L_("Passphrase too long"); else if (rc) return unlock_pinentry (ctrl, rc); if (!errtext && pininfo->min_digits) { /* do some basic checks on the entered PIN. */ if (!all_digitsp (pininfo->pin)) errtext = L_("Invalid characters in PIN"); else if (pininfo->max_digits && strlen (pininfo->pin) > pininfo->max_digits) errtext = L_("PIN too long"); else if (strlen (pininfo->pin) < pininfo->min_digits) errtext = L_("PIN too short"); } if (!errtext && pininfo->check_cb) { /* More checks by utilizing the optional callback. */ pininfo->cb_errtext = NULL; rc = pininfo->check_cb (pininfo); /* When pinentry cache causes an error, return now. */ if (rc && (pininfo->status & PINENTRY_STATUS_PASSWORD_FROM_CACHE)) return unlock_pinentry (ctrl, rc); if (gpg_err_code (rc) == GPG_ERR_BAD_PASSPHRASE) { if (pininfo->cb_errtext) errtext = pininfo->cb_errtext; else if (gpg_err_code (rc) == GPG_ERR_BAD_PASSPHRASE || gpg_err_code (rc) == GPG_ERR_BAD_PIN) errtext = (is_pin? L_("Bad PIN") : L_("Bad Passphrase")); } else if (rc) return unlock_pinentry (ctrl, rc); } if (!errtext) { if (pininfo->with_repeat && (pininfo->status & PINENTRY_STATUS_PIN_REPEATED)) pininfo->repeat_okay = 1; return unlock_pinentry (ctrl, 0); /* okay, got a PIN or passphrase */ } if ((pininfo->status & PINENTRY_STATUS_PASSWORD_FROM_CACHE)) { /* The password was read from the Pinentry's own cache. Don't count this against the retry count. */ pininfo->failed_tries--; } } return unlock_pinentry (ctrl, gpg_error (pininfo->min_digits? GPG_ERR_BAD_PIN : GPG_ERR_BAD_PASSPHRASE)); } /* Pop up the PIN-entry, display the text and the prompt and ask the user to confirm this. We return 0 for success, ie. the user confirmed it, GPG_ERR_NOT_CONFIRMED for what the text says or an other error. If WITH_CANCEL it true an extra cancel button is displayed to allow the user to easily return a GPG_ERR_CANCELED. if the Pinentry does not support this, the user can still cancel by closing the Pinentry window. */ int agent_get_confirmation (ctrl_t ctrl, const char *desc, const char *ok, const char *notok, int with_cancel) { int rc; char line[ASSUAN_LINELENGTH]; if (ctrl->pinentry_mode != PINENTRY_MODE_ASK) { if (ctrl->pinentry_mode == PINENTRY_MODE_CANCEL) return gpg_error (GPG_ERR_CANCELED); if (ctrl->pinentry_mode == PINENTRY_MODE_LOOPBACK) return pinentry_loopback_confirm (ctrl, desc, 1, ok, notok); return gpg_error (GPG_ERR_NO_PIN_ENTRY); } rc = start_pinentry (ctrl); if (rc) return rc; if (desc) build_cmd_setdesc (line, DIM(line), desc); else snprintf (line, DIM(line), "RESET"); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); /* Most pinentries out in the wild return the old Assuan error code for canceled which gets translated to an assuan Cancel error and not to the code for a user cancel. Fix this here. */ 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); if (rc) return unlock_pinentry (ctrl, rc); if (ok) { snprintf (line, DIM(line), "SETOK %s", ok); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (rc) return unlock_pinentry (ctrl, rc); } if (notok) { /* Try to use the newer NOTOK feature if a cancel button is requested. If no cancel button is requested we keep on using the standard cancel. */ if (with_cancel) { snprintf (line, DIM(line), "SETNOTOK %s", notok); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); } else rc = GPG_ERR_ASS_UNKNOWN_CMD; if (gpg_err_code (rc) == GPG_ERR_ASS_UNKNOWN_CMD) { snprintf (line, DIM(line), "SETCANCEL %s", notok); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); } if (rc) return unlock_pinentry (ctrl, rc); } { gnupg_fd_t sock_watched = ctrl->thread_startup.fd; npth_t thread; rc = watch_sock_start (&sock_watched, &thread); if (!rc) { rc = assuan_transact (entry_ctx, "CONFIRM", NULL, NULL, NULL, NULL, NULL, NULL); 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); watch_sock_end (&sock_watched, &thread); } return unlock_pinentry (ctrl, rc); } } /* The thread running the popup message. */ static void * popup_message_thread (void *arg) { gpg_error_t rc; gnupg_fd_t sock_watched = *(gnupg_fd_t *)arg; npth_t thread; rc = watch_sock_start (&sock_watched, &thread); if (rc) return NULL; /* We use the --one-button hack instead of the MESSAGE command to allow the use of old Pinentries. Those old Pinentries will then show an additional Cancel button but that is mostly a visual annoyance. */ assuan_transact (entry_ctx, "CONFIRM --one-button", NULL, NULL, NULL, NULL, NULL, NULL); watch_sock_end (&sock_watched, &thread); popup_finished = 1; return NULL; } /* Pop up a message window similar to the confirm one but keep it open until agent_popup_message_stop has been called. It is crucial for the caller to make sure that the stop function gets called as soon as the message is not anymore required because the message is system modal and all other attempts to use the pinentry will fail (after a timeout). */ int agent_popup_message_start (ctrl_t ctrl, const char *desc, const char *ok_btn) { int rc; char line[ASSUAN_LINELENGTH]; npth_attr_t tattr; int err; if (ctrl->pinentry_mode != PINENTRY_MODE_ASK) { if (ctrl->pinentry_mode == PINENTRY_MODE_CANCEL) return gpg_error (GPG_ERR_CANCELED); if (ctrl->pinentry_mode == PINENTRY_MODE_LOOPBACK) return pinentry_loopback_confirm (ctrl, desc, 0, ok_btn, NULL); return gpg_error (GPG_ERR_NO_PIN_ENTRY); } rc = start_pinentry (ctrl); if (rc) return rc; if (desc) build_cmd_setdesc (line, DIM(line), desc); else snprintf (line, DIM(line), "RESET"); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); if (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 (ctrl, rc); } err = npth_attr_init (&tattr); if (err) return unlock_pinentry (ctrl, gpg_error_from_errno (err)); npth_attr_setdetachstate (&tattr, NPTH_CREATE_JOINABLE); popup_finished = 0; err = npth_create (&popup_tid, &tattr, popup_message_thread, &ctrl->thread_startup.fd); npth_attr_destroy (&tattr); if (err) { rc = gpg_error_from_errno (err); log_error ("error spawning popup message handler: %s\n", strerror (err) ); return unlock_pinentry (ctrl, rc); } npth_setname_np (popup_tid, "popup-message"); return 0; } /* Close a popup window. */ void agent_popup_message_stop (ctrl_t ctrl) { int rc; pid_t pid; (void)ctrl; if (ctrl->pinentry_mode == PINENTRY_MODE_LOOPBACK) return; if (!popup_tid || !entry_ctx) { log_debug ("agent_popup_message_stop called with no active popup\n"); return; } pid = assuan_get_pid (entry_ctx); if (pid == (pid_t)(-1)) ; /* No pid available can't send a kill. */ else if (popup_finished) ; /* Already finished and ready for joining. */ #ifdef HAVE_W32_SYSTEM /* Older versions of assuan set PID to 0 on Windows to indicate an invalid value. */ else if (pid != (pid_t) INVALID_HANDLE_VALUE && pid != 0) { HANDLE process = (HANDLE) pid; /* Arbitrary error code. */ TerminateProcess (process, 1); } #else else if (pid > 0) kill (pid, SIGINT); #endif /* Now wait for the thread to terminate. */ rc = npth_join (popup_tid, NULL); if (rc) log_debug ("agent_popup_message_stop: pth_join failed: %s\n", strerror (rc)); /* Thread IDs are opaque, but we try our best here by resetting it to the same content that a static global variable has. */ memset (&popup_tid, '\0', sizeof (popup_tid)); /* Now we can close the connection. */ unlock_pinentry (ctrl, 0); } int agent_clear_passphrase (ctrl_t ctrl, const char *keyinfo, cache_mode_t cache_mode) { int rc; char line[ASSUAN_LINELENGTH]; if (! (keyinfo && (cache_mode == CACHE_MODE_NORMAL || cache_mode == CACHE_MODE_USER || cache_mode == CACHE_MODE_SSH))) return gpg_error (GPG_ERR_NOT_SUPPORTED); rc = start_pinentry (ctrl); if (rc) return rc; snprintf (line, DIM(line), "CLEARPASSPHRASE %c/%s", cache_mode == CACHE_MODE_USER? 'u' : cache_mode == CACHE_MODE_SSH? 's' : 'n', keyinfo); rc = assuan_transact (entry_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL); return unlock_pinentry (ctrl, rc); }