libpwmd.c

   1 /* vim:tw=78:ts=8:sw=4:set ft=c:  */
   2 /*
   3     Copyright (C) 2006-2007 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  02111-1307  USA
  18 */
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22 #include <err.h>
  23 #include <errno.h>
  24 #include <ctype.h>
  25 #include <string.h>
  26 #include <sys/socket.h>
  27 #include <sys/un.h>
  28 #include <signal.h>
  29 #include <stdarg.h>
  30 #include <string.h>
  31 #include <sys/wait.h>
  32 #include <fcntl.h>
  33 #include <pwd.h>
  34 #include <time.h>
  35 #include <sys/types.h>
  36 #include <limits.h>
  37 #include <libpwmd.h>
  38
  39 #ifdef HAVE_CONFIG_H
  40 #include <config.h>
  41 #endif
  42
  43 #ifdef HAVE_ASSUAN_H
  44 #include <assuan.h>
  45 #endif
  46
  47 #ifdef HAVE_SETLOCALE
  48 #include <locale.h>
  49 #endif
  50
  51 #include "gettext.h"
  52 #define N_(msgid)       dgettext("libpwmd", msgid)
  53
  54 #ifndef MEM_DEBUG
  55 #include "mem.h"
  56 #else
  57 #define xfree           free
  58 #define xrealloc        realloc
  59 #define xmalloc         malloc
  60 #define xstrdup         strdup
  61 #define xcalloc         calloc
  62 #endif
  63
  64 #include "types.h"
  65
  66 #ifdef USE_PINENTRY
  67 static pwm_t *gpwm;
  68 static int gelapsed, gtimeout;
  69 static gpg_error_t pinentry_command(pwm_t *pwm, char **result, const char *cmd);
  70 #endif
  71
  72 static gpg_error_t global_error;
  73
  74 const char *pwmd_strerror(gpg_error_t e)
  75 {
  76     gpg_err_code_t code = gpg_err_code(e);
  77
  78     if (code >= GPG_ERR_USER_1 && code < gpg_err_code(EPWMD_MAX)) {
  79         switch (code) {
  80             case GPG_ERR_USER_1:
  81             default:
  82                 return N_("Unknown error");
  83             case GPG_ERR_USER_2:
  84                 return N_("No cache slots available");
  85             case GPG_ERR_USER_3:
  86                 return N_("Recursion loop");
  87             case GPG_ERR_USER_4:
  88                 return N_("No file is open");
  89             case GPG_ERR_USER_5:
  90                 return N_("General LibXML error");
  91             case GPG_ERR_USER_6:
  92                 return N_("File modified");
  93         }
  94     }
  95
  96     return gpg_strerror(e);
  97 }
  98
  99 gpg_error_t pwmd_init()
 100 {
 101 #ifdef ENABLE_NLS
 102     bindtextdomain("libpwmd", LOCALEDIR);
 103 #endif
 104     gpg_err_init();
 105     assuan_set_malloc_hooks(xmalloc, xrealloc, xfree);
 106     assuan_set_assuan_err_source(GPG_ERR_SOURCE_DEFAULT);
 107     return 0;
 108 }
 109
 110 pwm_t *pwmd_connect(const char *path, gpg_error_t *error)
 111 {
 112     pwm_t *pwm = NULL;
 113     char *socketpath = NULL;
 114     time_t now;
 115     struct passwd *pw;
 116     assuan_context_t ctx;
 117     int rc;
 118
 119     if (!path) {
 120         pw = getpwuid(getuid());
 121         socketpath = (char *)xmalloc(strlen(pw->pw_dir) + strlen("/.pwmd/socket") + 1);
 122         sprintf(socketpath, "%s/.pwmd/socket", pw->pw_dir);
 123     }
 124     else
 125         socketpath = xstrdup(path);
 126
 127     rc = assuan_socket_connect_ext(&ctx, socketpath, -1, 0);
 128     xfree(socketpath);
 129
 130     if (rc) {
 131         *error = rc;
 132         return NULL;
 133     }
 134
 135     if ((pwm = (pwm_t *)xcalloc(1, sizeof(pwm_t))) == NULL) {
 136         *error = gpg_error_from_errno(errno);
 137         assuan_disconnect(ctx);
 138         return NULL;
 139     }
 140
 141     pwm->ctx = ctx;
 142 #ifdef USE_PINENTRY
 143     pwm->pid = -1;
 144     pwm->pinentry_tries = 3;
 145 #endif
 146     time(&now);
 147     srandom(now);
 148     *error = 0;
 149     return pwm;
 150 }
 151
 152 void pwmd_close(pwm_t *pwm)
 153 {
 154     if (!pwm)
 155         return;
 156
 157     if (pwm->ctx)
 158         assuan_disconnect(pwm->ctx);
 159
 160     if (pwm->password)
 161         xfree(pwm->password);
 162
 163     if (pwm->title)
 164         xfree(pwm->title);
 165
 166     if (pwm->desc)
 167         xfree(pwm->desc);
 168
 169     if (pwm->prompt)
 170         xfree(pwm->prompt);
 171
 172     if (pwm->pinentry_tty)
 173         xfree(pwm->pinentry_tty);
 174
 175     if (pwm->pinentry_display)
 176         xfree(pwm->pinentry_display);
 177
 178     if (pwm->pinentry_term)
 179         xfree(pwm->pinentry_term);
 180
 181     if (pwm->filename)
 182         xfree(pwm->filename);
 183
 184     xfree(pwm);
 185 }
 186
 187 static int mem_realloc_cb(void *data, const void *buffer, size_t len)
 188 {
 189     membuf_t *mem = (membuf_t *)data;
 190     void *p;
 191
 192     if (!buffer)
 193         return 0;
 194
 195     if ((p = xrealloc(mem->buf, mem->len + len)) == NULL)
 196         return 1;
 197
 198     mem->buf = p;
 199     memcpy((char *)mem->buf + mem->len, buffer, len);
 200     mem->len += len;
 201     return 0;
 202 }
 203
 204 void pwmd_free_result(void *data)
 205 {
 206     xfree(data);
 207 }
 208
 209 static int _inquire_cb(void *data, const char *keyword)
 210 {
 211     pwm_t *pwm = (pwm_t *)data;
 212     gpg_error_t rc = 0;
 213
 214     /* Shouldn't get this far without a callback. */
 215     if (!pwm->inquire_func)
 216         return GPG_ERR_INV_ARG;
 217
 218     for (;;) {
 219         char *result = NULL;
 220         size_t len;
 221
 222         rc = pwm->inquire_func(pwm->inquire_data, keyword, rc, &result, &len);
 223         rc = gpg_err_code(rc);
 224
 225         if (rc == GPG_ERR_EOF) {
 226             rc = 0;
 227             break;
 228         }
 229         else if (rc)
 230             break;
 231
 232         rc = assuan_send_data(pwm->ctx, result, len);
 233     }
 234
 235     return rc;
 236 }
 237
 238 static gpg_error_t assuan_command(pwm_t *pwm, assuan_context_t ctx,
 239         char **result, const char *cmd)
 240 {
 241     membuf_t data;
 242     gpg_error_t rc;
 243
 244     data.len = 0;
 245     data.buf = NULL;
 246
 247     rc = assuan_transact(ctx, cmd, mem_realloc_cb, &data, _inquire_cb, pwm,
 248             pwm->status_func, pwm->status_data);
 249
 250     if (rc) {
 251         if (data.buf) {
 252             xfree(data.buf);
 253             data.buf = NULL;
 254         }
 255     }
 256     else {
 257         if (data.buf) {
 258             mem_realloc_cb(&data, "", 1);
 259             *result = (char *)data.buf;
 260         }
 261     }
 262
 263     return gpg_err_code(rc);
 264 }
 265
 266 gpg_error_t pwmd_inquire(pwm_t *pwm, const char *cmd, pwmd_inquire_fn fn,
 267         void *data)
 268 {
 269     if (!pwm || !cmd || !fn)
 270         return GPG_ERR_INV_ARG;
 271
 272     pwm->inquire_func = fn;
 273     pwm->inquire_data = data;
 274     return assuan_command(pwm, pwm->ctx, NULL, cmd);
 275 }
 276
 277 gpg_error_t pwmd_terminate_pinentry(pwm_t *pwm)
 278 {
 279 #ifndef USE_PINENTRY
 280     return GPG_ERR_NOT_IMPLEMENTED;
 281 #endif
 282
 283     if (!pwm || pwm->pid == -1)
 284         return GPG_ERR_INV_ARG;
 285
 286     if (kill(pwm->pid, 0) == 0) {
 287         if (kill(pwm->pid, SIGTERM) == -1) {
 288             if (kill(pwm->pid, SIGKILL) == -1)
 289                 return gpg_error_from_errno(errno);
 290         }
 291
 292         global_error = GPG_ERR_TIMEOUT;
 293     }
 294     else
 295         return gpg_error_from_errno(errno);
 296
 297     return 0;
 298 }
 299
 300 #ifdef USE_PINENTRY
 301 static gpg_error_t set_pinentry_strings(pwm_t *pwm, int which)
 302 {
 303     char *buf;
 304     char tmp[ASSUAN_LINELENGTH];
 305     gpg_error_t error;
 306
 307     if (!pwm->title)
 308         pwm->title = xstrdup(N_("LibPWMD"));
 309
 310     if (!pwm->prompt)
 311         pwm->prompt = xstrdup(N_("Password:"));
 312
 313     if (!pwm->desc && !which)
 314         pwm->desc = xstrdup(N_("Enter a password."));
 315
 316     if (which == 1) {
 317         snprintf(tmp, sizeof(tmp), "SETERROR %s", N_("Invalid password, please try again."));
 318         buf = xstrdup(tmp);
 319     }
 320     else if (which == 2) {
 321         snprintf(tmp, sizeof(tmp), "SETERROR %s", N_("Please type the password again for confirmation."));
 322         buf = xstrdup(tmp);
 323     }
 324     else {
 325         buf = (char *)xmalloc(strlen("SETERROR ") + strlen(pwm->desc) + 1);
 326         sprintf(buf, "SETERROR %s", pwm->desc);
 327     }
 328
 329     error = pinentry_command(pwm, NULL, buf);
 330     xfree(buf);
 331
 332     if (error)
 333         return error;
 334
 335     buf = (char *)xmalloc(strlen("SETPROMPT ") + strlen(pwm->prompt) + 1);
 336     sprintf(buf, "SETPROMPT %s", pwm->prompt);
 337     error = pinentry_command(pwm, NULL, buf);
 338     xfree(buf);
 339
 340     if (error)
 341         return error;
 342
 343     buf = (char *)xmalloc(strlen("SETDESC ") + strlen(pwm->title) + 1);
 344     sprintf(buf, "SETDESC %s", pwm->title);
 345     error = pinentry_command(pwm, NULL, buf);
 346     xfree(buf);
 347     return error;
 348 }
 349
 350 static void update_pinentry_settings(pwm_t *pwm)
 351 {
 352     FILE *fp;
 353     char buf[LINE_MAX];
 354     struct passwd *pw = getpwuid(getuid());
 355     char *p;
 356
 357     snprintf(buf, sizeof(buf), "%s/.pwmd/pinentry.conf", pw->pw_dir);
 358
 359     if ((fp = fopen(buf, "r")) == NULL)
 360         return;
 361
 362     while ((p = fgets(buf, sizeof(buf), fp)) != NULL) {
 363         char name[32], val[256];
 364
 365         if (sscanf(p, " %31[a-zA-Z] = %255s", name, val) != 2)
 366             continue;
 367
 368         if (strcasecmp(name, "TTYNAME") == 0) {
 369             xfree(pwm->pinentry_tty);
 370             pwm->pinentry_tty = xstrdup(val);
 371         }
 372         else if (strcasecmp(name, "TTYTYPE") == 0) {
 373             xfree(pwm->pinentry_term);
 374             pwm->pinentry_term = xstrdup(val);
 375         }
 376         else if (strcasecmp(name, "DISPLAY") == 0) {
 377             xfree(pwm->pinentry_display);
 378             pwm->pinentry_display = xstrdup(val);
 379         }
 380         else if (strcasecmp(name, "PATH") == 0) {
 381             xfree(pwm->pinentry_path);
 382             pwm->pinentry_path = xstrdup(val);
 383         }
 384     }
 385
 386     fclose(fp);
 387 }
 388
 389 static gpg_error_t launch_pinentry(pwm_t *pwm)
 390 {
 391     int rc;
 392     assuan_context_t ctx;
 393     int child_list[] = {-1};
 394     char *display = getenv("DISPLAY");
 395     const char *argv[6];
 396     int have_display = 0;
 397     char *tty = NULL;
 398
 399     update_pinentry_settings(pwm);
 400
 401     if (pwm->pinentry_display || display)
 402         have_display = 1;
 403     else {
 404         tty = pwm->pinentry_tty ? pwm->pinentry_tty : ttyname(STDOUT_FILENO);
 405
 406         if (!tty)
 407             return gpg_error_from_errno(errno);
 408     }
 409
 410     if (!have_display && !tty)
 411         return GPG_ERR_ENOTTY;
 412
 413     argv[0] = "pinentry";
 414     argv[1] = have_display ? "--display" : "--ttyname";
 415     argv[2] = have_display ? pwm->pinentry_display ? pwm->pinentry_display : display : tty;
 416     argv[3] = NULL;
 417
 418     if (!have_display) {
 419         argv[3] = "--ttytype";
 420         argv[4] = pwm->pinentry_term ? pwm->pinentry_term : getenv("TERM");
 421         argv[5] = NULL;
 422     }
 423
 424     rc = assuan_pipe_connect(&ctx, pwm->pinentry_path ? pwm->pinentry_path : PINENTRY_PATH, argv, child_list);
 425
 426     if (rc)
 427         return rc;
 428
 429     pwm->pid = assuan_get_pid(ctx);
 430     pwm->pctx = ctx;
 431     return set_pinentry_strings(pwm, 0);
 432 }
 433
 434 static gpg_error_t pinentry_command(pwm_t *pwm, char **result, const char *cmd)
 435 {
 436     gpg_error_t n;
 437
 438     if (!pwm->pctx) {
 439         n = launch_pinentry(pwm);
 440
 441         if (n)
 442             return n;
 443     }
 444
 445     return assuan_command(pwm, pwm->pctx, result, cmd);
 446 }
 447
 448 static void pinentry_disconnect(pwm_t *pwm)
 449 {
 450     if (pwm->pctx)
 451         assuan_disconnect(pwm->pctx);
 452
 453     pwm->pctx = NULL;
 454     pwm->pid = -1;
 455 }
 456
 457 /*
 458  * Only called from a child process.
 459  */
 460 static void catchsig(int sig)
 461 {
 462     switch (sig) {
 463         case SIGALRM:
 464             if (gelapsed++ >= gtimeout) {
 465                 global_error = pwmd_terminate_pinentry(gpwm);
 466
 467                 if (!global_error)
 468                     global_error = GPG_ERR_TIMEOUT;
 469
 470                 break;
 471             }
 472
 473             alarm(1);
 474             break;
 475         default:
 476             break;
 477     }
 478 }
 479
 480 static char *percent_escape(const char *atext)
 481 {
 482     const unsigned char *s;
 483     int len = strlen(atext) * 3 + 1;
 484     char *buf = (char *)xmalloc(len), *p = buf;
 485
 486     if (!buf)
 487         return NULL;
 488
 489     for (s=(const unsigned char *)atext; *s; s++) {
 490         if (*s < ' ') {
 491             sprintf (p, "%%%02X", *s);
 492             p += 3;
 493         }
 494         else
 495             *p++ = *s;
 496     }
 497
 498     *p = 0;
 499     return buf;
 500 }
 501 #endif
 502
 503 static gpg_error_t send_command(pwm_t *pwm, char **result, const char *cmd)
 504 {
 505     if (!cmd)
 506         return GPG_ERR_INV_ARG;
 507
 508     return assuan_command(pwm, pwm->ctx, result, cmd);
 509 }
 510
 511 /*
 512  * Avoid sending the BYE command here. libassuan will close the file
 513  * descriptor and release the assuan context. Use pwmd_close() instead.
 514  */
 515 gpg_error_t pwmd_command(pwm_t *pwm, char **result, const char *cmd, ...)
 516 {
 517     va_list ap;
 518     char *buf;
 519     size_t len;
 520     gpg_error_t error;
 521
 522     if (!pwm || !cmd)
 523         return GPG_ERR_INV_ARG;
 524
 525     *result = NULL;
 526     va_start(ap, cmd);
 527     /*
 528      * C99
 529      */
 530     len = vsnprintf(NULL, 0, cmd, ap);
 531     buf = (char *)xmalloc(len + 1);
 532     len = vsnprintf(buf, len + 1, cmd, ap);
 533     va_end(ap);
 534     error = send_command(pwm, result, buf);
 535     xfree(buf);
 536     return error;
 537 }
 538
 539 #ifdef USE_PINENTRY
 540 static gpg_error_t do_getpin(pwm_t *pwm, char **result)
 541 {
 542     gpg_error_t error;
 543
 544     if (gtimeout) {
 545         signal(SIGALRM, catchsig);
 546         alarm(1);
 547     }
 548
 549     *result = NULL;
 550     error = pinentry_command(pwm, result, "GETPIN");
 551
 552     if (error == GPG_ERR_ASS_CANCELED || error == ASSUAN_Canceled)
 553         return GPG_ERR_ASS_CANCELED;
 554
 555     return 0;
 556 }
 557
 558 static gpg_error_t getpin(pwm_t *pwm, char **result, int *try_n, int which)
 559 {
 560     int pin_try = *try_n;
 561     gpg_error_t error;
 562
 563 getpin_again:
 564     *try_n = pin_try;
 565
 566     if (pin_try == -1) {
 567         error = set_pinentry_strings(pwm, which);
 568
 569         if (error) {
 570             pinentry_disconnect(pwm);
 571             return error;
 572         }
 573     }
 574     else {
 575         if (pwm->pinentry_tries-1 != pin_try) {
 576             error = set_pinentry_strings(pwm, 1);
 577
 578             if (error) {
 579                 pinentry_disconnect(pwm);
 580                 return error;
 581             }
 582         }
 583     }
 584
 585     error = do_getpin(pwm, result);
 586
 587     /*
 588      * Since there was input cancel any timeout.
 589      */
 590     alarm(0);
 591
 592     if (error) {
 593         if (pin_try != -1 && pin_try--)
 594             goto getpin_again;
 595
 596         if (pwm->pctx)
 597             pinentry_disconnect(pwm);
 598
 599         *try_n = pin_try;
 600         return error;
 601     }
 602
 603     return 0;
 604 }
 605 #endif
 606
 607 gpg_error_t pwmd_open_nb_finalize(pwm_t *pwm, pwmd_nb_status_t *pw)
 608 {
 609     char *result;
 610     gpg_error_t error;
 611
 612 #ifndef USE_PINENTRY
 613     return GPG_ERR_NOT_IMPLEMENTED;
 614 #endif
 615
 616     if (!pwm || !pw || !pw->filename[0])
 617         return GPG_ERR_INV_ARG;
 618
 619     close(pw->fd);
 620
 621     if (pw->error) {
 622         error = pw->error;
 623         goto fail;
 624     }
 625
 626     error = pwmd_command(pwm, &result, "ISCACHED %s", pw->filename);
 627
 628     if (error)
 629         goto fail;
 630
 631     if (pwm->filename)
 632         xfree(pwm->filename);
 633
 634     pwm->filename = xstrdup(pw->filename);
 635     memset(pw, 0, sizeof(pwmd_nb_status_t));
 636     return 0;
 637
 638 fail:
 639     memset(pw, 0, sizeof(pwmd_nb_status_t));
 640     return error;
 641 }
 642
 643 static gpg_error_t do_open_command(pwm_t *pwm, const char *filename, char *password)
 644 {
 645     char buf[ASSUAN_LINELENGTH];
 646     gpg_error_t error;
 647
 648     snprintf(buf, sizeof(buf), "OPEN %s %s", filename, password ? password : "");
 649     error = send_command(pwm, NULL, buf);
 650     memset(buf, 0, sizeof(buf));
 651     return error;
 652 }
 653
 654 static int do_pwmd_open(pwm_t *pwm, gpg_error_t *error, const char *filename,
 655         int nb, int timeout)
 656 {
 657     char *result = NULL;
 658     char *password = NULL;
 659     char path[PATH_MAX];
 660 #ifdef USE_PINENTRY
 661     int pin_try;
 662 #endif
 663
 664     if (!pwm || !filename || !*filename) {
 665         *error = GPG_ERR_INV_ARG;
 666         return nb ? -1 : 1;
 667     }
 668
 669 #ifdef USE_PINENTRY
 670     pin_try = pwm->pinentry_tries - 1;
 671 #endif
 672
 673     /*
 674      * Avoid calling pinentry if the password is cached on the server or if
 675      * this is a new file.
 676      */
 677     *error = pwmd_command(pwm, &result, "GETCONFIG data_directory");
 678
 679     if (*error)
 680         return nb ? -1 : 1;
 681
 682     snprintf(path, sizeof(path), "%s/%s", result, filename);
 683     pwmd_free_result(result);
 684
 685     if (access(path, R_OK) == -1) {
 686         if (errno == ENOENT)
 687             goto gotpassword;
 688
 689         *error = gpg_error_from_errno(errno);
 690         return nb ? -1 : 1;
 691     }
 692
 693     *error = pwmd_command(pwm, &result, "ISCACHED %s", filename);
 694
 695     if (*error == EPWMD_CACHE_NOT_FOUND) {
 696         if (pwm->passfunc) {
 697             password = pwm->passfunc(pwm, pwm->passdata);
 698             goto gotpassword;
 699         }
 700
 701         if (*error == EPWMD_CACHE_NOT_FOUND) {
 702 #ifdef USE_PINENTRY
 703             /*
 704              * Get the password from pinentry.
 705              */
 706             if (pwm->use_pinentry) {
 707                 /*
 708                  * Nonblocking is wanted. fork() then return a file descriptor
 709                  * that the client can use to read() from.
 710                  */
 711                 if (nb) {
 712                     int p[2];
 713                     pid_t pid;
 714                     pwmd_nb_status_t pw;
 715
 716                     if (pipe(p) == -1) {
 717                         *error = gpg_error_from_syserror();
 718                         return -1;
 719                     }
 720
 721                     pid = fork();
 722
 723                     switch (pid) {
 724                         case 0:
 725                             close(p[0]);
 726                             strncpy(pw.filename, filename, sizeof(pw.filename));
 727                             pw.fd = p[0];
 728
 729                             if (timeout > 0) {
 730                                 gpwm = pwm;
 731                                 gtimeout = timeout;
 732                                 gelapsed = 0;
 733                             }
 734
 735 getpin_nb_again:
 736                             *error = getpin(pwm, &password, &pin_try, 0);
 737
 738                             if (*error) {
 739 getpin_nb_fail:
 740                                 if (pwm->pctx)
 741                                     pinentry_disconnect(pwm);
 742
 743                                 if (gtimeout && gelapsed >= gtimeout)
 744                                     *error = GPG_ERR_TIMEOUT;
 745
 746                                 pw.error = *error;
 747                                 write(p[1], &pw, sizeof(pw));
 748                                 close(p[1]);
 749                                 _exit(1);
 750                             }
 751
 752                             /*
 753                              * Don't count the time it takes to open the file
 754                              * which may have many iterations.
 755                              */
 756                             signal(SIGALRM, SIG_DFL);
 757                             *error = do_open_command(pwm, filename, password);
 758
 759                             if (timeout)
 760                                 signal(SIGALRM, catchsig);
 761
 762                             if (pwm->pctx && *error == EPWMD_BADKEY) {
 763                                 if (pin_try-- > 0)
 764                                     goto getpin_nb_again;
 765
 766                                 goto getpin_nb_fail;
 767                             }
 768
 769                             pinentry_disconnect(pwm);
 770                             pw.error = 0;
 771                             write(p[1], &pw, sizeof(pw));
 772                             close(p[1]);
 773                             _exit(0);
 774                             break;
 775                         case -1:
 776                             *error = gpg_error_from_syserror();
 777                             close(p[0]);
 778                             close(p[1]);
 779                             return -1;
 780                         default:
 781                             break;
 782                     }
 783
 784                     close(p[1]);
 785                     return p[0];
 786                 }
 787
 788 getpin_again:
 789                 *error = getpin(pwm, &password, &pin_try, 1);
 790
 791                 if (*error) {
 792                     if (pwm->pctx)
 793                         pinentry_disconnect(pwm);
 794
 795                     if (global_error) {
 796                         *error = global_error;
 797                         global_error = 0;
 798                     }
 799
 800                     return 1;
 801                 }
 802             }
 803             else {
 804 #endif
 805                 /*
 806                  * Not using pinentry and the file was not found
 807                  * in the cache.
 808                  */
 809 #if 0
 810                 if (pwm->password == NULL) {
 811                     *error = EPWMD_KEY;
 812                     return 1;
 813                 }
 814 #endif
 815
 816                 password = pwm->password;
 817 #ifdef USE_PINENTRY
 818             }
 819 #endif
 820         }
 821     }
 822     else if (*error)
 823         return nb ? -1 : 1;
 824
 825 gotpassword:
 826     *error = do_open_command(pwm, filename, password);
 827
 828     /*
 829      * Keep the user defined password set with pwmd_setopt(). The password may
 830      * be needed later (pwmd_save()) depending on the pwmd file cache settings.
 831      */
 832     if (password && password != pwm->password)
 833         xfree(password);
 834
 835 #ifdef USE_PINENTRY
 836     if (pwm->pctx && *error == EPWMD_BADKEY) {
 837         if (pin_try-- > 0)
 838             goto getpin_again;
 839
 840         pinentry_disconnect(pwm);
 841         return nb ? -1 : 1;
 842     }
 843 #endif
 844
 845     if (!*error) {
 846         if (pwm->filename)
 847             xfree(pwm->filename);
 848
 849         pwm->filename = xstrdup(filename);
 850     }
 851
 852     /*
 853      * The file is cached or the file is a new file.
 854      */
 855     if (nb)
 856         return *error ? -1 : -2;
 857
 858     return *error ? 1 : 0;
 859 }
 860
 861 gpg_error_t pwmd_open(pwm_t *pwm, const char *filename)
 862 {
 863     gpg_error_t error;
 864
 865     do_pwmd_open(pwm, &error, filename, 0, 0);
 866     return error;
 867 }
 868
 869 int pwmd_open_nb(pwm_t *pwm, gpg_error_t *error, const char *filename,
 870         int timeout)
 871 {
 872 #ifndef USE_PINENTRY
 873     *error = GPG_ERR_NOT_IMPLEMENTED;
 874     return -1;
 875 #else
 876     return do_pwmd_open(pwm, error, filename, 1, timeout);
 877 #endif
 878 }
 879
 880 #ifdef USE_PINENTRY
 881 static gpg_error_t do_save_getpin(pwm_t *pwm, char **password)
 882 {
 883     int confirm = 0;
 884     gpg_error_t error;
 885     char *result = NULL;
 886     int pin_try = -1;
 887
 888 again:
 889     error = getpin(pwm, &result, &pin_try, confirm ? 2 : 0);
 890
 891     if (error) {
 892         if (pwm->pctx)
 893             pinentry_disconnect(pwm);
 894
 895         if (*password)
 896             xfree(*password);
 897
 898         return error;
 899     }
 900
 901     if (!confirm++) {
 902         *password = result;
 903         goto again;
 904     }
 905
 906     if (strcmp(*password, result)) {
 907         xfree(*password);
 908         xfree(result);
 909         pinentry_disconnect(pwm);
 910         error = EPWMD_BADKEY;
 911         return error;
 912     }
 913
 914     xfree(result);
 915     pinentry_disconnect(pwm);
 916     return 0;
 917 }
 918 #endif
 919
 920 static gpg_error_t do_save_command(pwm_t *pwm, char *password)
 921 {
 922     char buf[ASSUAN_LINELENGTH];
 923     gpg_error_t error;
 924
 925     snprintf(buf, sizeof(buf), "SAVE %s", password ? password : "");
 926     error = send_command(pwm, NULL, buf);
 927     memset(&buf, 0, sizeof(buf));
 928     return error;
 929 }
 930
 931 gpg_error_t pwmd_save_nb_finalize(pwm_t *pwm, pwmd_nb_status_t *pw)
 932 {
 933     gpg_error_t error;
 934
 935 #ifndef USE_PINENTRY
 936     return GPG_ERR_NOT_IMPLEMENTED;
 937 #endif
 938
 939     if (!pwm || !pw || !pw->filename[0])
 940         return GPG_ERR_INV_ARG;
 941
 942     close(pw->fd);
 943
 944     if (pw->error) {
 945         error = pw->error;
 946         memset(pw, 0, sizeof(pwmd_nb_status_t));
 947         return error;
 948     }
 949
 950     memset(pw, 0, sizeof(pwmd_nb_status_t));
 951     return 0;
 952 }
 953
 954 static int do_pwmd_save(pwm_t *pwm, gpg_error_t *error, int nb)
 955 {
 956     char *result = NULL;
 957     char *password = NULL;
 958
 959     if (!pwm) {
 960         *error = GPG_ERR_INV_ARG;
 961         return nb ? -1 : 1;
 962     }
 963
 964     if (pwm->use_pinentry || pwm->passfunc) {
 965         *error = pwmd_command(pwm, &result, "ISCACHED %s", pwm->filename);
 966
 967         if (*error == EPWMD_CACHE_NOT_FOUND) {
 968 #ifdef USE_PINENTRY
 969             if (pwm->use_pinentry) {
 970                 if (nb) {
 971                     int p[2];
 972                     pid_t pid;
 973                     pwmd_nb_status_t pw;
 974
 975                     if (pipe(p) == -1) {
 976                         *error = gpg_error_from_syserror();
 977                         return -1;
 978                     }
 979
 980                     pid = fork();
 981
 982                     switch (pid) {
 983                         case 0:
 984                             close(p[0]);
 985                             strncpy(pw.filename, pwm->filename, sizeof(pw.filename));
 986                             pw.fd = p[0];
 987
 988                             do {
 989                                 password = NULL;
 990                                 *error = do_save_getpin(pwm, &password);
 991                             } while (*error == EPWMD_BADKEY);
 992
 993                             if (*error) {
 994                                 if (pwm->pctx)
 995                                     pinentry_disconnect(pwm);
 996
 997                                 pw.error = *error;
 998                                 write(p[1], &pw, sizeof(pw));
 999                                 close(p[1]);
1000                                 _exit(1);
1001                             }
1002
1003                             *error = do_save_command(pwm, password);
1004                             pinentry_disconnect(pwm);
1005                             pw.error = *error;
1006                             write(p[1], &pw, sizeof(pw));
1007                             close(p[1]);
1008                             _exit(0);
1009                             break;
1010                         case -1:
1011                             *error = gpg_error_from_syserror();
1012                             close(p[0]);
1013                             close(p[1]);
1014                             return -1;
1015                         default:
1016                             break;
1017                     }
1018
1019                     close(p[1]);
1020                     return p[0];
1021                 }
1022
1023                 *error = do_save_getpin(pwm, &password);
1024
1025                 if (*error)
1026                     return 1;
1027             }
1028             else {
1029 #endif
1030                 if (pwm->passfunc)
1031                     password = (*pwm->passfunc)(pwm, pwm->passdata);
1032 #ifdef USE_PINENTRY
1033             }
1034 #endif
1035         }
1036         else {
1037             if (*error)
1038                 return nb ? -1 : 1;
1039         }
1040     }
1041     else
1042         password = pwm->password;
1043
1044     *error = do_save_command(pwm, password);
1045
1046     if (password && password != pwm->password)
1047         xfree(password);
1048
1049     if (nb)
1050         return *error ? -1 : -2;
1051
1052     return *error ? 1 : 0;
1053 }
1054
1055 int pwmd_save_nb(pwm_t *pwm, gpg_error_t *error)
1056 {
1057 #ifndef USE_PINENTRY
1058     *error = GPG_ERR_NOT_IMPLEMENTED;
1059     return -1;
1060 #else
1061     return do_pwmd_save(pwm, error, 1);
1062 #endif
1063 }
1064
1065 gpg_error_t pwmd_save(pwm_t *pwm)
1066 {
1067     gpg_error_t error;
1068
1069     do_pwmd_save(pwm, &error, 0);
1070     return error;
1071 }
1072
1073 gpg_error_t pwmd_setopt(pwm_t *pwm, pwmd_option_t opt, ...)
1074 {
1075     va_list ap;
1076 #ifdef USE_PINENTRY
1077     int n = va_arg(ap, int);
1078 #endif
1079     char *arg1;
1080
1081     if (!pwm)
1082         return GPG_ERR_INV_ARG;
1083
1084     va_start(ap, opt);
1085
1086     switch (opt) {
1087         case PWMD_OPTION_STATUS_FUNC:
1088             pwm->status_func = va_arg(ap, pwmd_status_fn);
1089             break;
1090         case PWMD_OPTION_STATUS_DATA:
1091             pwm->status_data = va_arg(ap, void *);
1092             break;
1093         case PWMD_OPTION_PASSWORD_FUNC:
1094             pwm->passfunc = va_arg(ap, pwmd_password_fn);
1095             break;
1096         case PWMD_OPTION_PASSWORD_DATA:
1097             pwm->passdata = va_arg(ap, void *);
1098             break;
1099         case PWMD_OPTION_PASSWORD:
1100             arg1 = va_arg(ap, char *);
1101
1102             if (pwm->password)
1103                 xfree(pwm->password);
1104
1105             pwm->password = xstrdup(arg1);
1106             break;
1107 #ifdef USE_PINENTRY
1108         case PWMD_OPTION_PINENTRY:
1109             n = va_arg(ap, int);
1110
1111             if (n != 0 && n != 1) {
1112                 va_end(ap);
1113                 return GPG_ERR_INV_VALUE;
1114             }
1115
1116             pwm->use_pinentry = n;
1117             break;
1118         case PWMD_OPTION_PINENTRY_TRIES:
1119             n = va_arg(ap, int);
1120
1121             if (n <= 0) {
1122                 va_end(ap);
1123                 return GPG_ERR_INV_VALUE;
1124             }
1125
1126             pwm->pinentry_tries = n;
1127             break;
1128         case PWMD_OPTION_PINENTRY_PATH:
1129             if (pwm->pinentry_path)
1130                 xfree(pwm->pinentry_path);
1131
1132             pwm->pinentry_path = xstrdup(va_arg(ap, char *));
1133             break;
1134         case PWMD_OPTION_PINENTRY_TTY:
1135             if (pwm->pinentry_tty)
1136                 xfree(pwm->pinentry_tty);
1137
1138             pwm->pinentry_tty = xstrdup(va_arg(ap, char *));
1139             break;
1140         case PWMD_OPTION_PINENTRY_DISPLAY:
1141             if (pwm->pinentry_display)
1142                 xfree(pwm->pinentry_display);
1143
1144             pwm->pinentry_display = xstrdup(va_arg(ap, char *));
1145             break;
1146         case PWMD_OPTION_PINENTRY_TERM:
1147             if (pwm->pinentry_term)
1148                 xfree(pwm->pinentry_term);
1149
1150             pwm->pinentry_term = xstrdup(va_arg(ap, char *));
1151             break;
1152         case PWMD_OPTION_PINENTRY_TITLE:
1153             if (pwm->title)
1154                 xfree(pwm->title);
1155             pwm->title = percent_escape(va_arg(ap, char *));
1156             break;
1157         case PWMD_OPTION_PINENTRY_PROMPT:
1158             if (pwm->prompt)
1159                 xfree(pwm->prompt);
1160             pwm->prompt = percent_escape(va_arg(ap, char *));
1161             break;
1162         case PWMD_OPTION_PINENTRY_DESC:
1163             if (pwm->desc)
1164                 xfree(pwm->desc);
1165             pwm->desc = percent_escape(va_arg(ap, char *));
1166             break;
1167 #else
1168         case PWMD_OPTION_PINENTRY:
1169         case PWMD_OPTION_PINENTRY_TRIES:
1170         case PWMD_OPTION_PINENTRY_PATH:
1171         case PWMD_OPTION_PINENTRY_TTY:
1172         case PWMD_OPTION_PINENTRY_DISPLAY:
1173         case PWMD_OPTION_PINENTRY_TERM:
1174         case PWMD_OPTION_PINENTRY_TITLE:
1175         case PWMD_OPTION_PINENTRY_PROMPT:
1176         case PWMD_OPTION_PINENTRY_DESC:
1177             return GPG_ERR_NOT_IMPLEMENTED;
1178 #endif
1179         default:
1180             va_end(ap);
1181             return GPG_ERR_NOT_IMPLEMENTED;
1182     }
1183
1184     va_end(ap);
1185     return 0;
1186 }