src/pinentry.c

   1 /* vim:tw=78:ts=8:sw=4:set ft=c:  */
   2 /*
   3     Copyright (C) 2007-2008 Ben Kibbey <bjk@luxsci.net>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02110-1301  USA
  18 */
  19 #include <stdlib.h>
  20 #include <gcrypt.h>
  21 #include <glib.h>
  22 #include <errno.h>
  23 #include <pth.h>
  24 #include <pwd.h>
  25 #include <signal.h>
  26 #include <sys/types.h>
  27 #include <sys/wait.h>
  28
  29 #ifdef HAVE_CONFIG_H
  30 #include <config.h>
  31 #endif
  32
  33 #ifdef __FreeBSD__
  34 #include <sys/types.h>
  35 #include <signal.h>
  36 #endif
  37
  38 #ifdef WITH_QUALITY
  39 #include <crack.h>
  40 #include "misc.h"
  41 #endif
  42
  43 #include "mem.h"
  44 #include "common.h"
  45 #include "commands.h"
  46 #include "pinentry.h"
  47 #include "misc.h"
  48 #include "pwmd_error.h"
  49 #include "lock.h"
  50
  51 void free_client_list();
  52 static gpg_error_t set_pinentry_strings(struct pinentry_s *pin, int which);
  53
  54 static int mem_realloc_cb(void *data, const void *buffer, size_t len)
  55 {
  56     membuf_t *mem = (membuf_t *)data;
  57     void *p;
  58
  59     if (!buffer)
  60         return 0;
  61
  62     if ((p = xrealloc(mem->buf, mem->len + len)) == NULL)
  63         return 1;
  64
  65     mem->buf = p;
  66     memcpy((char *)mem->buf + mem->len, buffer, len);
  67     mem->len += len;
  68     return 0;
  69 }
  70
  71 #ifdef WITH_QUALITY
  72 static int quality_cb(void *data, const char *line)
  73 {
  74     struct pinentry_s *pin = data;
  75     const gchar *tmp;
  76     gint score = 0;
  77     gchar buf[5];
  78
  79     if (strncmp(line, "QUALITY ", 8) != 0)
  80         return GPG_ERR_INV_ARG;
  81
  82     if (!(tmp = FascistCheck(line+8, CRACKLIB_DICT)))
  83         return assuan_send_data(pin->ctx, "100", 3);
  84
  85     if (!strcmp(tmp, "it's WAY too short"))
  86         score = 10;
  87     else if (!strcmp(tmp, "it is too short"))
  88         score = 20;
  89     else if (!strcmp(tmp, "it is all whitespace"))
  90         score = 25;
  91     else if (!strcmp(tmp, "it is based on your username"))
  92         score = 30;
  93     else if (!strcmp(tmp, "it is based on a dictionary word"))
  94         score = 40;
  95     else if (!strcmp(tmp, "it is based upon your password entry"))
  96         score = 50;
  97     else if (!strcmp(tmp, "it's derived from your password entry"))
  98         score = 50;
  99     else if (!strcmp(tmp, "it is based on a (reversed) dictionary word"))
 100         score = 60;
 101     else if (!strcmp(tmp, "it is derivable from your password entry"))
 102         score = 70;
 103     else if (!strcmp(tmp, "it does not contain enough DIFFERENT characters"))
 104         score = 80;
 105     else if (!strcmp(tmp, "it is too simplistic/systematic"))
 106         score = 90;
 107     else
 108         score = 0;
 109
 110     tmp = (const gchar *)print_fmt(buf, sizeof(buf), "%i", score);
 111     return assuan_send_data(pin->ctx, tmp, strlen(tmp));
 112 }
 113 #endif
 114
 115 static gpg_error_t assuan_command(struct pinentry_s *pin, gchar **result,
 116         const gchar *cmd)
 117 {
 118     gpg_error_t rc;
 119
 120     pin->data.len = 0;
 121     pin->data.buf = NULL;
 122
 123     rc = assuan_transact(pin->ctx, cmd, mem_realloc_cb, &pin->data,
 124             pin->inquire_cb, pin->inquire_data, NULL, NULL);
 125
 126     if (rc) {
 127         if (pin->data.buf) {
 128             xfree(pin->data.buf);
 129             pin->data.buf = NULL;
 130         }
 131     }
 132     else {
 133         if (pin->data.buf) {
 134             mem_realloc_cb(&pin->data, "", 1);
 135             *result = (gchar *)pin->data.buf;
 136         }
 137     }
 138
 139     return rc;
 140 }
 141
 142 static gpg_error_t set_pinentry_options(struct pinentry_s *pin)
 143 {
 144     gchar *display = getenv("DISPLAY");
 145     gint have_display = 0;
 146     gchar *tty = NULL, *ttytype = NULL;
 147     gchar *opt, *val;
 148     gpg_error_t rc;
 149     gchar *result = NULL;
 150     gchar cmd[ASSUAN_LINELENGTH];
 151
 152     if (pin->display || display)
 153         have_display = 1;
 154     else {
 155         tty = pin->ttyname ? pin->ttyname : ttyname(STDOUT_FILENO);
 156
 157         if (!tty)
 158             return GPG_ERR_CANCELED;
 159     }
 160
 161     if (!have_display && !tty)
 162         return GPG_ERR_CANCELED;
 163
 164     if (!have_display) {
 165         gchar *p = getenv("TERM");
 166
 167         ttytype = pin->ttytype ? pin->ttytype : p;
 168
 169         if (!ttytype)
 170             return GPG_ERR_CANCELED;
 171     }
 172
 173     opt = have_display ? "DISPLAY" : "TTYNAME";
 174     val = have_display ? pin->display ? pin->display : display : tty;
 175     g_snprintf(cmd, sizeof(cmd), "OPTION %s=%s", g_ascii_strdown(opt, strlen(opt)), val);
 176     rc = assuan_command(pin, &result, cmd);
 177
 178     if (rc)
 179         return rc;
 180
 181     if (!have_display) {
 182         g_snprintf(cmd, sizeof(cmd), "OPTION ttytype=%s", ttytype);
 183         rc = assuan_command(pin, &result, cmd);
 184     }
 185
 186     return rc;
 187 }
 188
 189 static gpg_error_t launch_pinentry(struct pinentry_s *pin)
 190 {
 191     gpg_error_t rc;
 192     assuan_context_t ctx;
 193     gint child_list[] = {-1};
 194     const gchar *argv[8];
 195     const gchar **p = argv;
 196
 197     *p++ = "pinentry";
 198
 199     if (pin->display) {
 200         *p++ = "--display";
 201         *p++ = pin->display;
 202     }
 203
 204     if (pin->lcctype) {
 205         *p++ = "--lc-ctype";
 206         *p++ = pin->lcctype;
 207     }
 208
 209     if (pin->lcmessages) {
 210         *p++ = "--lc-messages";
 211         *p++ = pin->lcmessages;
 212     }
 213
 214     *p = NULL;
 215     rc = assuan_pipe_connect(&ctx, pin->path ? pin->path : PINENTRY_PATH,
 216             argv, child_list);
 217
 218     if (rc)
 219         return rc;
 220
 221     pin->pid = assuan_get_pid(ctx);
 222     pin->ctx = ctx;
 223     rc = set_pinentry_options(pin);
 224     return rc ? rc : set_pinentry_strings(pin, 0);
 225 }
 226
 227 static gpg_error_t pinentry_command(struct pinentry_s *pin, gchar **result,
 228         const gchar *cmd)
 229 {
 230     gpg_error_t rc = 0;
 231
 232     if (!pin->ctx)
 233         rc = launch_pinentry(pin);
 234
 235     return rc ? rc : assuan_command(pin, result, cmd);
 236 }
 237
 238 static gpg_error_t set_pinentry_strings(struct pinentry_s *pin, int which)
 239 {
 240     char *buf;
 241     gpg_error_t rc;
 242     gchar *title = NULL;
 243
 244 #ifdef WITH_QUALITY
 245     if (pin->which == PINENTRY_SAVE && which != 2) {
 246         rc = pinentry_command(pin, NULL, "SETQUALITYBAR");
 247
 248         if (rc)
 249             goto done;
 250
 251         pin->inquire_cb = quality_cb;
 252         pin->inquire_data = pin;
 253     }
 254 #endif
 255
 256     if (which == 1)
 257         title = g_strdup(N_("Passphrase mismatch, please try again."));
 258     else if (!pin->title)
 259         title = pin->title = g_strdup_printf(N_("Password Manager Daemon%s%s"),
 260                 pin->name ? ": " : "", pin->name ? pin->name : "");
 261     else
 262         title = pin->title;
 263
 264     if (!pin->prompt)
 265         pin->prompt = g_strdup(N_("Passphrase:"));
 266
 267     if (!pin->desc && !which)
 268         pin->desc = g_strdup_printf(pin->which == PINENTRY_OPEN ?
 269                 N_("A passphrase is required to open the file \"%s\". Please%%0Aenter the passphrase below.") :
 270                 N_("A passphrase is required to save to the file \"%s\". Please%%0Aenter the passphrase below."),
 271                 pin->filename);
 272
 273     if (which == 2)
 274         buf = g_strdup_printf("SETERROR %s", N_("Please enter the passphrase again for confirmation."));
 275     else
 276         buf = g_strdup_printf("SETERROR %s", pin->desc);
 277
 278     rc = pinentry_command(pin, NULL, buf);
 279     g_free(buf);
 280
 281     if (rc)
 282         goto done;
 283
 284     buf = g_strdup_printf("SETPROMPT %s", pin->prompt);
 285     rc = pinentry_command(pin, NULL, buf);
 286     g_free(buf);
 287
 288     if (rc)
 289         goto done;
 290
 291     buf = g_strdup_printf("SETDESC %s", title);
 292     rc = pinentry_command(pin, NULL, buf);
 293     g_free(buf);
 294
 295 done:
 296     if (which == 1)
 297         g_free(title);
 298
 299     return rc;
 300 }
 301
 302 static void pinentry_disconnect(struct pinentry_s *pin)
 303 {
 304     if (!pin)
 305         return;
 306
 307     if (pin->ctx)
 308         assuan_disconnect(pin->ctx);
 309
 310     pin->ctx = NULL;
 311     pin->pid = 0;
 312 }
 313
 314 static gpg_error_t do_getpin(struct pinentry_s *pin, char **result)
 315 {
 316     gpg_error_t rc;
 317
 318     *result = NULL;
 319     rc = pinentry_command(pin, result, "GETPIN");
 320
 321     if (!*result)
 322         *result = xstrdup("");
 323
 324     return rc;
 325 }
 326
 327 gpg_error_t pinentry_getpin(struct pinentry_s *pin, gchar **result)
 328 {
 329     gint which = 0;
 330     gpg_error_t rc = set_pinentry_strings(pin, which);
 331     gchar *result1 = NULL;
 332
 333     if (rc)
 334         goto done;
 335
 336 again:
 337     rc = do_getpin(pin, result);
 338
 339     if (rc)
 340         goto done;
 341
 342     if (pin->which == PINENTRY_SAVE) {
 343         if (!result1) {
 344             rc = set_pinentry_strings(pin, 2);
 345
 346             if (rc)
 347                 goto done;
 348
 349             result1 = g_strdup(*result);
 350             goto again;
 351         }
 352
 353         if (strcmp(result1, *result)) {
 354             g_free(result1);
 355             xfree(*result);
 356             result1 = *result = NULL;
 357             rc = set_pinentry_strings(pin, 1);
 358
 359             if (rc)
 360                 goto done;
 361
 362             goto again;
 363         }
 364     }
 365
 366 done:
 367     g_free(result1);
 368     pinentry_disconnect(pin);
 369     return rc;
 370 }
 371
 372 static int write_result(int fd, pinentry_key_s *pk, char *result)
 373 {
 374     size_t len;
 375
 376     if (pk->error) {
 377         /*
 378          * libassuan handles GPG_ERR_EOF in assuan_process_done() and
 379          * will disconnect the client even if the error isn't related
 380          * to it. Use GPG_ERR_CANCELED instead.
 381          */
 382         if (gpg_err_code(pk->error) == GPG_ERR_EOF)
 383             pk->error = GPG_ERR_CANCELED;
 384
 385         len = pth_write(fd, pk, sizeof(pinentry_key_s));
 386         close(fd);
 387
 388         if (len != sizeof(pinentry_key_s))
 389             log_write("%s(%i): write: len != sizeof(pk)", __FUNCTION__, __LINE__);
 390
 391         return 1;
 392     }
 393
 394     if (pk->status == PINENTRY_PID)
 395         pk->what.pid = atoi(result);
 396     else
 397         g_strlcpy(pk->what.key, result, sizeof(pk->what.key));
 398
 399     xfree(result);
 400     len = pth_write(fd, pk, sizeof(pinentry_key_s));
 401
 402     if (len != sizeof(pinentry_key_s)) {
 403         memset(pk, 0, sizeof(pinentry_key_s));
 404         log_write("%s(%i): write: len != sizeof(pk)", __FUNCTION__, __LINE__);
 405         close(fd);
 406         return 1;
 407     }
 408
 409     if (pk->status != PINENTRY_PID)
 410         close(fd);
 411
 412     memset(pk, 0, sizeof(pinentry_key_s));
 413     return 0;
 414 }
 415
 416 static void reset(struct pinentry_s *pin)
 417 {
 418     int status;
 419
 420     if (pin->pid)
 421         waitpid(pin->pid, &status, 0);
 422
 423     if (pin->fd != -1)
 424         close(pin->fd);
 425
 426     pin->fd = -1;
 427     pin->pid = pin->pin_pid = 0;
 428     pin->tid = 0;
 429     pin->status = PINENTRY_NONE;
 430 }
 431
 432 /* pin->status_mutex should be locked before calling this function. */
 433 static void kill_pinentry(struct pinentry_s *pin)
 434 {
 435     if (pin->pin_pid == 0)
 436         return;
 437
 438     if (kill(pin->pin_pid, 0) == 0)
 439         if (kill(pin->pin_pid, SIGTERM) == 0)
 440             if (kill(pin->pin_pid, 0) == 0)
 441                 kill(pin->pin_pid, SIGKILL);
 442
 443     pin->pin_pid = 0;
 444 }
 445
 446 static void timeout_cleanup(void *arg)
 447 {
 448     pth_event_t ev = arg;
 449
 450     pth_event_free(ev, PTH_FREE_ALL);
 451 }
 452
 453 static void *timeout_thread(void *arg)
 454 {
 455     struct pinentry_s *pin = arg;
 456     pth_event_t ev;
 457     pth_attr_t attr = pth_attr_of(pth_self());
 458
 459     pth_attr_set(attr, PTH_ATTR_NAME, __FUNCTION__);
 460     pth_attr_destroy(attr);
 461     ev = pth_event(PTH_EVENT_TIME, pth_timeout(pin->timeout, 0));
 462     MUTEX_LOCK(&pin->cond_mutex);
 463     pth_cleanup_push(timeout_cleanup, ev);
 464     pth_cond_await(&pin->cond, &pin->cond_mutex, ev);
 465     pth_cleanup_pop(1);
 466
 467     /* pth_cond_notify() was called from pinentry_iterate() (we have a
 468      * key). */
 469     if (pin->status == PINENTRY_NONE) {
 470         MUTEX_UNLOCK(&pin->cond_mutex);
 471         pth_exit(PTH_CANCELED);
 472         return NULL;
 473     }
 474
 475     MUTEX_LOCK(&pin->status_mutex);
 476     kill_pinentry(pin);
 477     pin->status = PINENTRY_TIMEOUT;
 478     MUTEX_UNLOCK(&pin->cond_mutex);
 479     MUTEX_UNLOCK(&pin->status_mutex);
 480     pth_exit(PTH_CANCELED);
 481     return NULL;
 482 }
 483
 484 gpg_error_t pinentry_fork(assuan_context_t ctx)
 485 {
 486     struct client_s *client = assuan_get_pointer(ctx);
 487     struct pinentry_s *pin = client->pinentry;
 488     gpg_error_t rc;
 489     gint p[2];
 490     pid_t pid;
 491     pinentry_key_s pk;
 492     gchar *result = NULL;
 493
 494     if (pipe(p) == -1)
 495         return gpg_error_from_syserror();
 496
 497     pid = pth_fork();
 498
 499     switch (pid) {
 500         case -1:
 501             rc = gpg_error_from_syserror();
 502             close(p[0]);
 503             close(p[1]);
 504             return rc;
 505         case 0:
 506             close(p[0]);
 507             /* FIXME segfaults in libpth at pth_ring_append() (xmalloc).
 508                this is probably only a symptom of another problem.  */
 509             //free_client_list();
 510
 511             if (pin->timeout > 0 && pin->which == PINENTRY_OPEN) {
 512                 /*
 513                  * Send the pid of the pinentry process back to pwmd so it can
 514                  * handle the pinentry timeout properly.
 515                  */
 516                 pk.status = PINENTRY_PID;
 517                 pk.error = pinentry_command(pin, &result, "GETINFO pid");
 518
 519                 if (write_result(p[1], &pk, result))
 520                     _exit(EXIT_FAILURE);
 521             }
 522
 523             pk.status = PINENTRY_RUNNING;
 524             pk.error = pinentry_getpin(pin, &result);
 525
 526             if (write_result(p[1], &pk, result))
 527                 _exit(EXIT_FAILURE);
 528
 529             _exit(EXIT_SUCCESS);
 530         default:
 531             close(p[1]);
 532             client->pinentry->fd = p[0];
 533             client->pinentry->pid = pid;
 534             client->pinentry->status = PINENTRY_INIT;
 535             break;
 536     }
 537
 538     /*
 539      * Don't call assuan_process_done() here. That should be done in
 540      * the callback function which is called after the key has been read()
 541      * in pinentry_iterate().
 542      */
 543     return 0;
 544 }
 545
 546 gpg_error_t lock_pin_mutex(struct client_s *client)
 547 {
 548     gpg_error_t rc = 0;
 549
 550     MUTEX_TRYLOCK(client->ctx, &pin_mutex, rc);
 551
 552     if (!rc)
 553         client->pinentry->has_lock = TRUE;
 554
 555     return rc;
 556 }
 557
 558 void unlock_pin_mutex(struct pinentry_s *pin)
 559 {
 560     if (pin->has_lock == FALSE)
 561         return;
 562
 563     MUTEX_UNLOCK(&pin_mutex);
 564     pin->has_lock = FALSE;
 565 }
 566
 567 void cleanup_pinentry(struct pinentry_s *pin)
 568 {
 569     if (!pin)
 570         return;
 571
 572     if (pin->ctx && pin->pid)
 573         pinentry_disconnect(pin);
 574
 575     if (!pth_mutex_acquire(&pin->status_mutex, TRUE, NULL) && errno == EBUSY) {
 576         MUTEX_UNLOCK(&pin->status_mutex);
 577     }
 578     else
 579         pth_mutex_release(&pin->status_mutex);
 580
 581     MUTEX_LOCK(&pin->status_mutex);
 582     kill_pinentry(pin);
 583     MUTEX_UNLOCK(&pin->status_mutex);
 584     unlock_pin_mutex(pin);
 585
 586     if (!pth_mutex_acquire(&pin->cond_mutex, TRUE, NULL) && errno == EBUSY) {
 587         MUTEX_UNLOCK(&pin->cond_mutex);
 588     }
 589     else
 590         pth_mutex_release(&pin->cond_mutex);
 591
 592     if (pin->name)
 593         g_free(pin->name);
 594
 595     g_free(pin->ttyname);
 596     g_free(pin->ttytype);
 597     g_free(pin->desc);
 598     g_free(pin->title);
 599     g_free(pin->prompt);
 600     g_free(pin->path);
 601     g_free(pin->display);
 602     g_free(pin->filename);
 603     g_free(pin->lcctype);
 604     g_free(pin->lcmessages);
 605     g_free(pin);
 606 }
 607
 608 void set_pinentry_defaults(struct pinentry_s *pin)
 609 {
 610     FILE *fp;
 611     gchar buf[PATH_MAX];
 612     gchar *p;
 613
 614     pin->enable = -1;
 615     g_snprintf(buf, sizeof(buf), "%s/.pwmd/pinentry.conf", g_get_home_dir());
 616     fp = fopen(buf, "r");
 617
 618     if (fp) {
 619         while ((p = fgets(buf, sizeof(buf), fp)) != NULL) {
 620             gchar name[32] = {0}, value[256] = {0};
 621
 622             if (*p == '#')
 623                 continue;
 624
 625             if (p[strlen(p)-1] == '\n')
 626                 p[strlen(p)-1] = 0;
 627
 628             if (sscanf(p, " %31[a-zA-Z] = %255s", name, value) != 2)
 629                 continue;
 630
 631             if (g_strcasecmp("TTYNAME", name) == 0)
 632                 pin->ttyname = g_strdup(value);
 633             else if (g_strcasecmp("TTYTYPE", name) == 0)
 634                 pin->ttytype = g_strdup(value);
 635             else if (g_strcasecmp("DISPLAY", name) == 0)
 636                 pin->display = g_strdup(value);
 637             else if (g_strcasecmp("PATH", name) == 0)
 638                 pin->path = g_strdup(value);
 639             else if (g_strcasecmp("LC_TYPE", name) == 0)
 640                 pin->lcctype = g_strdup(value);
 641             else if (g_strcasecmp("LC_MESSAGES", name) == 0)
 642                 pin->lcmessages = g_strdup(value);
 643         }
 644
 645         fclose(fp);
 646     }
 647
 648     pin->timeout = get_key_file_integer("global", "pinentry_timeout");
 649 }
 650
 651 int pinentry_iterate(struct client_s *cl, gboolean read_ready)
 652 {
 653     gpg_error_t rc;
 654
 655     MUTEX_LOCK(&cl->pinentry->status_mutex);
 656
 657     /* Set from pinentry_timeout_thread(). */
 658     if (cl->pinentry->status == PINENTRY_TIMEOUT) {
 659         cl->pinentry->status = PINENTRY_NONE;
 660         rc = send_error(cl->ctx, GPG_ERR_TIMEOUT);
 661         cleanup_client(cl);
 662         reset(cl->pinentry);
 663         unlock_pin_mutex(cl->pinentry);
 664         MUTEX_UNLOCK(&cl->pinentry->status_mutex);
 665     }
 666
 667     if (cl->pinentry->status == PINENTRY_RUNNING) {
 668         if (read_ready) {
 669             guchar *shakey;
 670             pinentry_key_s pk;
 671             gsize len;
 672
 673             memset(&pk, 0, sizeof(pk));
 674             len = pth_read(cl->pinentry->fd, &pk, sizeof(pk));
 675             pth_cancel_point();
 676
 677             if (len == sizeof(pk)) {
 678                 if (pk.error) {
 679                     if (cl->pinentry->status == PINENTRY_TIMEOUT)
 680                         pk.error = GPG_ERR_TIMEOUT;
 681
 682                     rc = send_error(cl->ctx, pk.error);
 683                 }
 684                 else if (pk.status == PINENTRY_PID) {
 685                     gint n;
 686
 687                     /*
 688                      * Start the timeout thread for the pinentry process
 689                      * now that we know the pid of it.
 690                      */
 691                     pth_attr_t attr = pth_attr_new();
 692                     pth_attr_init(attr);
 693                     pth_attr_set(attr, PTH_ATTR_JOINABLE, FALSE);
 694                     cl->pinentry->pin_pid = pk.what.pid;
 695                     cl->pinentry->tid = pth_spawn(attr, timeout_thread,
 696                             cl->pinentry);
 697                     n = errno;
 698                     pth_attr_destroy(attr);
 699
 700                     if (!cl->pinentry->tid) {
 701                         log_write("%s(%i): pth_spawn(): %s", __FILE__, __LINE__,
 702                                 _gpg_strerror(gpg_error_from_errno(n)));
 703                         pk.error = gpg_error_from_errno(n);
 704                     }
 705                 }
 706                 else {
 707                     if (cl->pinentry->tid) {
 708                         cl->pinentry->status = PINENTRY_NONE;
 709                         pth_cond_notify(&cl->pinentry->cond, FALSE);
 710                     }
 711
 712                     shakey = gcry_malloc(gcrykeysize);
 713
 714                     if (!shakey)
 715                         pk.error = gpg_error_from_errno(ENOMEM);
 716                     else {
 717                         gcry_md_hash_buffer(GCRY_MD_SHA256, shakey,
 718                                 pk.what.key,
 719                                 strlen(pk.what.key) == 0 ? 1 : strlen(pk.what.key));
 720                         rc = cl->pinentry->cb(cl->ctx, shakey, FALSE);
 721                     }
 722                 }
 723             }
 724             else if (len == -1) {
 725                 if (cl->pinentry->status == PINENTRY_TIMEOUT)
 726                     pk.error = GPG_ERR_TIMEOUT;
 727
 728                 pk.error = gpg_err_code_from_syserror();
 729                 log_write("%s", _gpg_strerror(pk.error));
 730             }
 731             else if (len == 0) {
 732                 if (cl->pinentry->status == PINENTRY_TIMEOUT)
 733                     pk.error = GPG_ERR_TIMEOUT;
 734
 735                 pk.error = GPG_ERR_EOF;
 736                 log_write("%s", _gpg_strerror(pk.error));
 737             }
 738             else
 739                 log_write(N_("read(): short byte count"));
 740
 741             if (pk.error) {
 742                 if (cl->pinentry->tid) {
 743                     cl->pinentry->status = PINENTRY_NONE;
 744                     pth_cond_notify(&cl->pinentry->cond, FALSE);
 745                 }
 746
 747                 if (cl->pinentry->which == PINENTRY_OPEN)
 748                     cleanup_client(cl);
 749             }
 750
 751             if (pk.error || pk.status == PINENTRY_RUNNING) {
 752                 reset(cl->pinentry);
 753                 unlock_file_mutex(cl);
 754                 unlock_pin_mutex(cl->pinentry);
 755             }
 756
 757             memset(&pk, 0, sizeof(pk));
 758         }
 759     }
 760
 761     MUTEX_UNLOCK(&cl->pinentry->status_mutex);
 762     return 0;
 763 }
 764
 765 struct pinentry_s *pinentry_init()
 766 {
 767     struct pinentry_s *pin = g_malloc0(sizeof(struct pinentry_s));
 768
 769     if (!pin)
 770         return NULL;
 771
 772     pth_mutex_init(&pin->status_mutex);
 773     pth_mutex_init(&pin->cond_mutex);
 774     pth_cond_init(&pin->cond);
 775     set_pinentry_defaults(pin);
 776     return pin;
 777 }