src/libpwmd.c

   1 /* vim:tw=78:ts=8:sw=4:set ft=c:  */
   2 /*
   3     Copyright (C) 2006-2009 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 <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 <sys/select.h>
  38 #include <netdb.h>
  39 #include <netinet/in.h>
  40 #include <sys/socket.h>
  41 #include <libpwmd.h>
  42
  43 #ifdef HAVE_CONFIG_H
  44 #include <config.h>
  45 #endif
  46
  47 #ifdef WITH_LIBPTH
  48 #include <pth.h>
  49 #endif
  50
  51 #ifdef WITH_TCP
  52 #define DNS_USE_GETTIMEOFDAY_FOR_ID 1
  53 #include <ares.h>
  54 #include <arpa/nameser.h>
  55 #ifdef WITH_LIBPTH
  56 #include <gcrypt.h>
  57 GCRY_THREAD_OPTION_PTH_IMPL;
  58 #endif
  59 #endif
  60
  61 #ifdef HAVE_ASSUAN_H
  62 #include <assuan.h>
  63 #endif
  64
  65 #ifdef HAVE_SETLOCALE
  66 #include <locale.h>
  67 #endif
  68
  69 #include "gettext.h"
  70 #define N_(msgid)       dgettext("libpwmd", msgid)
  71
  72 #include "mem.h"
  73 #include "types.h"
  74
  75 #ifdef WITH_PINENTRY
  76 static pwm_t *gpwm;
  77 static int gelapsed, gtimeout;
  78 static gpg_error_t pinentry_command(pwm_t *pwm, char **result, const char *cmd);
  79 static gpg_error_t global_error;
  80 #endif
  81
  82 const char *pwmd_strerror(gpg_error_t e)
  83 {
  84     gpg_err_code_t code = gpg_err_code(e);
  85
  86     if (code >= GPG_ERR_USER_1 && code < gpg_err_code(EPWMD_MAX)) {
  87         switch (code) {
  88             case GPG_ERR_USER_1:
  89             default:
  90                 return N_("Unknown error");
  91             case GPG_ERR_USER_2:
  92                 return N_("No cache slots available");
  93             case GPG_ERR_USER_3:
  94                 return N_("Recursion loop");
  95             case GPG_ERR_USER_4:
  96                 return N_("No file is open");
  97             case GPG_ERR_USER_5:
  98                 return N_("General LibXML error");
  99             case GPG_ERR_USER_6:
 100                 return N_("File modified");
 101             case GPG_ERR_USER_7:
 102                 return N_("Access denied");
 103         }
 104     }
 105
 106     return gpg_strerror(e);
 107 }
 108
 109 gpg_error_t pwmd_init()
 110 {
 111     static int initialized;
 112
 113     if (initialized)
 114         return 0;
 115
 116 #ifdef WITH_LIBPTH
 117     gcry_control (GCRYCTL_SET_THREAD_CBS, &gcry_threads_pth);
 118 #endif
 119 #ifndef MEM_DEBUG
 120     xmem_init();
 121 #endif
 122 #ifdef ENABLE_NLS
 123     bindtextdomain("libpwmd", LOCALEDIR);
 124 #endif
 125     gpg_err_init();
 126     assuan_set_malloc_hooks(xmalloc, xrealloc, xfree);
 127     assuan_set_assuan_err_source(GPG_ERR_SOURCE_DEFAULT);
 128     initialized = 1;
 129     return 0;
 130 }
 131
 132 static pwm_t *_socket_connect_finalize(pwm_t *pwm, assuan_context_t ctx)
 133 {
 134     int active[2];
 135     int n = assuan_get_active_fds(ctx, 0, active, sizeof(active));
 136
 137     pwm->fd = n <= 0 ? -1 : dup(active[0]);
 138     pwm->ctx = ctx;
 139 #ifdef WITH_PINENTRY
 140     pwm->pid = -1;
 141     pwm->pinentry_tries = 3;
 142 #endif
 143     assuan_set_pointer(ctx, pwm);
 144     return pwm;
 145 }
 146
 147 #ifdef WITH_TCP
 148 static int read_hook(assuan_context_t ctx, assuan_fd_t fd, void *data,
 149         size_t len, ssize_t *ret)
 150 {
 151     pwm_t *pwm = assuan_get_pointer(ctx);
 152
 153     if (!pwm || !pwm->tcp_conn)
 154         *ret = read((int)fd, data, len);
 155     else {
 156         do {
 157             *ret = libssh2_channel_read(pwm->tcp_conn->channel, data, len);
 158         } while (*ret == LIBSSH2_ERROR_EAGAIN);
 159     }
 160
 161     return *ret <= 0 ? 0 : 1;
 162 }
 163
 164 static int write_hook(assuan_context_t ctx, assuan_fd_t fd, const void *data,
 165         size_t len, ssize_t *ret)
 166 {
 167     pwm_t *pwm = assuan_get_pointer(ctx);
 168
 169     if (!pwm || !pwm->tcp_conn)
 170         *ret = write((int)fd, data, len);
 171     else {
 172         do {
 173             *ret = libssh2_channel_write(pwm->tcp_conn->channel, data, len);
 174         } while (*ret == LIBSSH2_ERROR_EAGAIN);
 175     }
 176
 177     return *ret <= 0 ? 0 : 1;
 178 }
 179
 180 static void _ssh_deinit(pwmd_tcp_conn_t *conn);
 181 static void free_tcp_conn(pwmd_tcp_conn_t *conn)
 182 {
 183     if (!conn)
 184         return;
 185
 186     if (conn->username) {
 187         xfree(conn->username);
 188         conn->username = NULL;
 189     }
 190
 191     if (conn->known_hosts) {
 192         xfree(conn->known_hosts);
 193         conn->known_hosts = NULL;
 194     }
 195
 196     if (conn->identity) {
 197         xfree(conn->identity);
 198         conn->identity = NULL;
 199     }
 200
 201     if (conn->identity_pub) {
 202         xfree(conn->identity_pub);
 203         conn->identity_pub = NULL;
 204     }
 205
 206     if (conn->host) {
 207         xfree(conn->host);
 208         conn->host = NULL;
 209     }
 210
 211     if (conn->hostkey) {
 212         xfree(conn->hostkey);
 213         conn->hostkey = NULL;
 214     }
 215
 216     if (conn->chan) {
 217         ares_destroy(conn->chan);
 218         conn->chan = NULL;
 219     }
 220
 221     if (conn->he) {
 222         ares_free_hostent(conn->he);
 223         conn->he = NULL;
 224     }
 225
 226     if (conn->fd >= 0) {
 227         close(conn->fd);
 228         conn->fd = -1;
 229     }
 230
 231     if (conn->session)
 232         _ssh_deinit(conn);
 233     else
 234         xfree(conn);
 235 }
 236
 237 static void _ssh_deinit(pwmd_tcp_conn_t *conn)
 238 {
 239     if (!conn)
 240         return;
 241
 242     if (conn->channel)
 243         libssh2_channel_free(conn->channel);
 244
 245     if (conn->session) {
 246         libssh2_session_disconnect(conn->session, "Bye!");
 247         libssh2_session_free(conn->session);
 248     }
 249
 250     conn->session = NULL;
 251     conn->channel = NULL;
 252     free_tcp_conn(conn);
 253 }
 254
 255 static void _ssh_assuan_deinit(assuan_context_t ctx)
 256 {
 257     pwm_t *pwm = assuan_get_pointer(ctx);
 258
 259     _ssh_deinit(pwm->tcp_conn);
 260     pwm->tcp_conn = NULL;
 261 }
 262
 263 /*
 264  * Sets common options from both pwmd_tcp_connect() and
 265  * pwmd_tcp_connect_async().
 266  */
 267 static gpg_error_t init_tcp_conn(pwmd_tcp_conn_t **dst, const char *host,
 268         int port, const char *identity, const char *user, const char *hosts,
 269         int get)
 270 {
 271     pwmd_tcp_conn_t *conn;
 272     gpg_error_t rc = 0;
 273
 274     if (get) {
 275         if (!host)
 276             return GPG_ERR_INV_ARG;
 277     }
 278     else {
 279         if (!host || !identity || !user || !hosts)
 280             return GPG_ERR_INV_ARG;
 281     }
 282
 283     conn = xcalloc(1, sizeof(pwmd_tcp_conn_t));
 284
 285     if (!conn)
 286         return gpg_error_from_errno(ENOMEM);
 287
 288     conn->port = port == -1 ? 22 : port;
 289     conn->host = xstrdup(host);
 290
 291     if (!conn->host) {
 292         rc = gpg_error_from_errno(ENOMEM);
 293         goto fail;
 294     }
 295
 296     if (!get) {
 297         conn->identity = xstrdup(identity);
 298
 299         if (!conn->identity) {
 300             rc = gpg_error_from_errno(ENOMEM);
 301             goto fail;
 302         }
 303
 304         conn->identity_pub = xmalloc(strlen(conn->identity)+5);
 305
 306         if (!conn->identity_pub) {
 307             rc = gpg_error_from_errno(ENOMEM);
 308             goto fail;
 309         }
 310
 311         sprintf(conn->identity_pub, "%s.pub", conn->identity);
 312         conn->username = xstrdup(user);
 313
 314         if (!conn->username) {
 315             rc = gpg_error_from_errno(ENOMEM);
 316             goto fail;
 317         }
 318
 319         conn->known_hosts = xstrdup(hosts);
 320
 321         if (!conn->known_hosts) {
 322             rc = gpg_error_from_errno(ENOMEM);
 323             goto fail;
 324         }
 325     }
 326
 327     *dst = conn;
 328     return 0;
 329
 330 fail:
 331     free_tcp_conn(conn);
 332     return rc;
 333 }
 334
 335 static gpg_error_t do_connect(pwm_t *pwm, int prot, void *addr)
 336 {
 337     struct sockaddr_in their_addr;
 338
 339     pwm->tcp_conn->fd = socket(prot, SOCK_STREAM, 0);
 340
 341     if (pwm->tcp_conn->fd == -1)
 342         return gpg_error_from_syserror();
 343
 344     if (pwm->tcp_conn->async)
 345         fcntl(pwm->tcp_conn->fd, F_SETFL, O_NONBLOCK);
 346
 347     pwm->cmd = ASYNC_CMD_CONNECT;
 348     their_addr.sin_family = prot;
 349     their_addr.sin_port = htons(pwm->tcp_conn->port);
 350     their_addr.sin_addr = *((struct in_addr *)addr);
 351     memset(their_addr.sin_zero, '\0', sizeof their_addr.sin_zero);
 352
 353 #ifdef WITH_LIBPTH
 354     if (pth_connect(pwm->tcp_conn->fd, (struct sockaddr *)&their_addr,
 355                 sizeof(their_addr)) == -1)
 356 #else
 357     if (connect(pwm->tcp_conn->fd, (struct sockaddr *)&their_addr,
 358                 sizeof(their_addr)) == -1)
 359 #endif
 360         return gpg_error_from_syserror();
 361
 362     return 0;
 363 }
 364
 365 static gpg_error_t ares_error_to_pwmd(int status)
 366 {
 367     if (status != ARES_SUCCESS)
 368         warnx("%s", ares_strerror(status));
 369
 370     switch (status) {
 371         case ARES_ENODATA:
 372         case ARES_EFORMERR:
 373         case ARES_ENOTFOUND:
 374             return GPG_ERR_UNKNOWN_HOST;
 375         case ARES_ESERVFAIL:
 376              return GPG_ERR_EHOSTDOWN;
 377         case ARES_ETIMEOUT:
 378             return GPG_ERR_TIMEOUT;
 379         case ARES_ENOMEM:
 380             return gpg_error_from_errno(ENOMEM);
 381         case ARES_ECONNREFUSED:
 382             return GPG_ERR_ECONNREFUSED;
 383         default:
 384             /* FIXME ??? */
 385             return GPG_ERR_EHOSTUNREACH;
 386     }
 387
 388     return ARES_SUCCESS;
 389 }
 390
 391 static void dns_resolve_cb(void *arg, int status, int timeouts,
 392         unsigned char *abuf, int alen)
 393 {
 394     pwm_t *pwm = arg;
 395     int rc;
 396     struct hostent *he;
 397
 398     if (status == ARES_EDESTRUCTION)
 399         return;
 400
 401     if (status != ARES_SUCCESS) {
 402         pwm->tcp_conn->rc = ares_error_to_pwmd(status);
 403         return;
 404     }
 405
 406     //FIXME localhost. works with ipv4. maybe local system config error
 407     /* Check for an IPv6 address first. */
 408     rc = ares_parse_a_reply(abuf, alen, &he, NULL, NULL);
 409
 410     if (rc != ARES_SUCCESS) {
 411         if (rc != ARES_ENODATA) {
 412             pwm->tcp_conn->rc = ares_error_to_pwmd(status);
 413             return;
 414         }
 415
 416         rc = ares_parse_aaaa_reply(abuf, alen, &he, NULL, NULL);
 417
 418         if (rc != ARES_SUCCESS) {
 419             pwm->tcp_conn->rc = ares_error_to_pwmd(status);
 420             return;
 421         }
 422     }
 423
 424     pwm->tcp_conn->he = he;
 425     pwm->tcp_conn->rc = do_connect(pwm, he->h_addrtype, he->h_addr);
 426 }
 427
 428 pwm_t *_do_pwmd_tcp_connect_async(const char *host, int port,
 429         const char *identity, const char *user, const char *known_hosts,
 430         gpg_error_t *rc, pwmd_async_cmd_t which)
 431 {
 432     pwmd_tcp_conn_t *conn;
 433     pwm_t *pwm;
 434
 435     *rc = init_tcp_conn(&conn, host, port, identity, user, known_hosts,
 436             which == ASYNC_CMD_HOSTKEY ? 1 : 0);
 437
 438     if (*rc)
 439         return NULL;
 440
 441     if ((pwm = (pwm_t *)xcalloc(1, sizeof(pwm_t))) == NULL) {
 442         *rc = gpg_error_from_syserror();
 443         free_tcp_conn(conn);
 444         return NULL;
 445     }
 446
 447     conn->async = 1;
 448     pwm->tcp_conn = conn;
 449     pwm->tcp_conn->cmd = which;
 450
 451     if (pwm->tcp_conn->cmd == ASYNC_CMD_HOSTKEY)
 452         pwm->tcp_conn->get_only = 1;
 453
 454     pwm->cmd = ASYNC_CMD_DNS;
 455     pwm->state = ASYNC_PROCESS;
 456     ares_init(&pwm->tcp_conn->chan);
 457     ares_query(pwm->tcp_conn->chan, pwm->tcp_conn->host, ns_c_any, ns_t_any,
 458             dns_resolve_cb, pwm);
 459     return pwm;
 460 }
 461
 462 pwm_t *pwmd_tcp_connect_async(const char *host, int port, const char *identity,
 463         const char *user, const char *known_hosts, gpg_error_t *rc)
 464 {
 465     return _do_pwmd_tcp_connect_async(host, port, identity, user, known_hosts,
 466             rc, ASYNC_CMD_CONNECT);
 467 }
 468
 469 void *_ssh_malloc(size_t size, void **data)
 470 {
 471     return xmalloc(size);
 472 }
 473
 474 void _ssh_free(void *ptr, void **data)
 475 {
 476     xfree(ptr);
 477 }
 478
 479 void *_ssh_realloc(void *ptr, size_t size, void **data)
 480 {
 481     return xrealloc(ptr, size);
 482 }
 483
 484 static char *to_hex(const char *str, size_t slen)
 485 {
 486     int i;
 487     char *buf = xmalloc(slen*2+1);
 488
 489     if (!buf)
 490         return NULL;
 491
 492     for (i = 0, buf[0] = 0; i < slen; i++) {
 493         char tmp[3];
 494
 495         sprintf(tmp, "%02x", (unsigned char)str[i]);
 496         strcat(buf, tmp);
 497     }
 498
 499     return buf;
 500 }
 501
 502 static int verify_host_key(pwm_t *pwm)
 503 {
 504     FILE *fp = fopen(pwm->tcp_conn->known_hosts, "r");
 505     char *buf, *p;
 506
 507     if (!fp)
 508         return 1;
 509
 510     buf = xmalloc(LINE_MAX);
 511
 512     if (!buf)
 513         goto fail;
 514
 515     while ((p = fgets(buf, LINE_MAX, fp))) {
 516         if (*p == '#' || isspace(*p))
 517             continue;
 518
 519         if (p[strlen(p)-1] == '\n')
 520             p[strlen(p)-1] = 0;
 521
 522         if (!strcmp(buf, pwm->tcp_conn->hostkey))
 523             goto done;
 524     }
 525
 526 fail:
 527     if (buf)
 528         xfree(buf);
 529
 530     fclose(fp);
 531     return 1;
 532
 533 done:
 534     xfree(buf);
 535     fclose(fp);
 536     return 0;
 537 }
 538
 539 static gpg_error_t authenticate_ssh(pwm_t *pwm)
 540 {
 541     const char *fp = libssh2_hostkey_hash(pwm->tcp_conn->session,
 542             LIBSSH2_HOSTKEY_HASH_SHA1);
 543     char *userauth;
 544
 545     pwm->tcp_conn->hostkey = to_hex(fp, 20);
 546
 547     if (!pwm->tcp_conn->hostkey)
 548         return gpg_error_from_errno(ENOMEM);
 549
 550     if (pwm->tcp_conn->get_only)
 551         return 0;
 552
 553     if (!fp || verify_host_key(pwm))
 554         return GPG_ERR_CHECKSUM;
 555
 556     userauth = libssh2_userauth_list(pwm->tcp_conn->session,
 557             pwm->tcp_conn->username, strlen(pwm->tcp_conn->username));
 558
 559     if (!userauth || !strstr(userauth, "publickey"))
 560         return GPG_ERR_BAD_PIN_METHOD;
 561
 562     if (libssh2_userauth_publickey_fromfile(pwm->tcp_conn->session,
 563                 pwm->tcp_conn->username, pwm->tcp_conn->identity_pub,
 564                 pwm->tcp_conn->identity, NULL))
 565         return GPG_ERR_BAD_SECKEY;
 566
 567     return 0;
 568 }
 569
 570 static pwm_t *setup_context(pwm_t *pwm, gpg_error_t *rc)
 571 {
 572     assuan_context_t ctx;
 573     struct assuan_io_hooks io_hooks = {read_hook, write_hook};
 574
 575     pwm->tcp_conn->session = libssh2_session_init_ex(_ssh_malloc, _ssh_free,
 576             _ssh_realloc, NULL);
 577
 578     if (!pwm->tcp_conn->session) {
 579         *rc = gpg_error_from_errno(ENOMEM);
 580         goto fail;
 581     }
 582
 583     if (libssh2_session_startup(pwm->tcp_conn->session, pwm->tcp_conn->fd)) {
 584         *rc = GPG_ERR_ASSUAN_SERVER_FAULT;
 585         goto fail;
 586     }
 587
 588     *rc = authenticate_ssh(pwm);
 589
 590     if (*rc)
 591         goto fail;
 592
 593     /* pwmd_get_hostkey(). */
 594     if (pwm->tcp_conn->get_only) {
 595         pwm->result = xstrdup(pwm->tcp_conn->hostkey);
 596
 597         if (!pwm->result) {
 598             *rc = gpg_error_from_errno(ENOMEM);
 599             goto fail;
 600         }
 601
 602         return pwm;
 603     }
 604
 605     pwm->tcp_conn->channel = libssh2_channel_open_session(pwm->tcp_conn->session);
 606
 607     if (!pwm->tcp_conn->channel) {
 608         *rc = GPG_ERR_ASSUAN_SERVER_FAULT;
 609         goto fail;
 610     }
 611
 612     if (libssh2_channel_shell(pwm->tcp_conn->channel)) {
 613         *rc = GPG_ERR_ASSUAN_SERVER_FAULT;
 614         goto fail;
 615     }
 616
 617     assuan_set_io_hooks(&io_hooks);
 618     *rc = assuan_socket_connect_fd(&ctx, pwm->tcp_conn->fd, 0, pwm);
 619
 620     if (*rc)
 621         goto fail;
 622
 623     assuan_set_finish_handler(ctx, _ssh_assuan_deinit);
 624     return _socket_connect_finalize(pwm, ctx);
 625
 626 fail:
 627     if (!pwm->tcp_conn->async)
 628         pwmd_close(pwm);
 629
 630     return NULL;
 631 }
 632
 633 static pwm_t *_do_pwmd_tcp_connect(const char *host, int port,
 634         const char *identity, const char *user, const char *known_hosts,
 635         gpg_error_t *rc, int get)
 636 {
 637     pwm_t *pwm = NULL;
 638     pwmd_tcp_conn_t *conn;
 639
 640     *rc = init_tcp_conn(&conn, host, port, identity, user, known_hosts, get);
 641
 642     if (*rc)
 643         return NULL;
 644
 645     if ((pwm = (pwm_t *)xcalloc(1, sizeof(pwm_t))) == NULL) {
 646         *rc = gpg_error_from_errno(ENOMEM);
 647         goto fail;
 648     }
 649
 650     pwm->tcp_conn = conn;
 651     pwm->tcp_conn->get_only = get;
 652     pwm->cmd = ASYNC_CMD_DNS;
 653     ares_init(&pwm->tcp_conn->chan);
 654     ares_query(pwm->tcp_conn->chan, pwm->tcp_conn->host, ns_c_any, ns_t_any,
 655             dns_resolve_cb, pwm);
 656
 657     /* dns_resolve_cb() may have already been called. */
 658     if (pwm->tcp_conn->rc) {
 659         *rc = pwm->tcp_conn->rc;
 660         goto fail;
 661     }
 662
 663     /*
 664      * Fake a blocking DNS lookup. libcares does a better job than
 665      * getaddrinfo().
 666      */
 667     do {
 668         fd_set rfds, wfds;
 669         int n;
 670         struct timeval tv;
 671
 672         FD_ZERO(&rfds);
 673         FD_ZERO(&wfds);
 674         n = ares_fds(pwm->tcp_conn->chan, &rfds, &wfds);
 675         ares_timeout(pwm->tcp_conn->chan, NULL, &tv);
 676 #ifdef WITH_LIBPTH
 677         n = pth_select(n, &rfds, &wfds, NULL, &tv);
 678 #else
 679         n = select(n, &rfds, &wfds, NULL, &tv);
 680 #endif
 681
 682         if (n == -1) {
 683             *rc = gpg_error_from_syserror();
 684             goto fail;
 685         }
 686         else if (n == 0) {
 687             *rc = GPG_ERR_TIMEOUT;
 688             goto fail;
 689         }
 690
 691         ares_process(pwm->tcp_conn->chan, &rfds, &wfds);
 692
 693         if (pwm->tcp_conn->rc)
 694             break;
 695     } while (pwm->cmd == ASYNC_CMD_DNS);
 696
 697     if (pwm->tcp_conn->rc) {
 698         *rc = pwm->tcp_conn->rc;
 699         goto fail;
 700     }
 701
 702     return setup_context(pwm, rc);
 703
 704 fail:
 705     pwmd_close(pwm);
 706     return NULL;
 707 }
 708
 709 pwm_t *pwmd_tcp_connect(const char *host, int port, const char *identity,
 710         const char *user, const char *known_hosts, gpg_error_t *rc)
 711 {
 712     return _do_pwmd_tcp_connect(host, port, identity, user, known_hosts, rc, 0);
 713 }
 714
 715 /* Must free the result with pwmd_free_result(). */
 716 char *pwmd_get_hostkey(const char *host, int port, gpg_error_t *rc)
 717 {
 718     char *hostkey;
 719     pwm_t *pwm;
 720
 721     pwm = _do_pwmd_tcp_connect(host, port, NULL, NULL, NULL, rc, 1);
 722
 723     if (!pwm)
 724         return NULL;
 725
 726     hostkey = xstrdup(pwm->tcp_conn->hostkey);
 727
 728     if (!hostkey)
 729         *rc = gpg_error_from_errno(ENOMEM);
 730
 731     pwmd_close(pwm);
 732     return hostkey;
 733 }
 734
 735 pwm_t *pwmd_get_hostkey_async(const char *host, int port, gpg_error_t *rc)
 736 {
 737     return _do_pwmd_tcp_connect_async(host, port, NULL, NULL, NULL, rc,
 738             ASYNC_CMD_HOSTKEY);
 739 }
 740 #endif
 741
 742 pwm_t *pwmd_connect(const char *path, gpg_error_t *rc)
 743 {
 744     pwm_t *pwm = NULL;
 745     char *socketpath = NULL;
 746     struct passwd *pw;
 747     assuan_context_t ctx;
 748
 749     if (!path) {
 750         pw = getpwuid(getuid());
 751         socketpath = (char *)xmalloc(strlen(pw->pw_dir) + strlen("/.pwmd/socket") + 1);
 752         sprintf(socketpath, "%s/.pwmd/socket", pw->pw_dir);
 753     }
 754     else
 755         socketpath = xstrdup(path);
 756
 757     *rc = assuan_socket_connect_ext(&ctx, socketpath, -1, 0);
 758     xfree(socketpath);
 759
 760     if (*rc)
 761         return NULL;
 762
 763     if ((pwm = (pwm_t *)xcalloc(1, sizeof(pwm_t))) == NULL) {
 764         *rc = gpg_error_from_syserror();
 765         return NULL;
 766     }
 767
 768     return _socket_connect_finalize(pwm, ctx);
 769 }
 770
 771 gpg_error_t pwmd_pending_line(pwm_t *pwm, char **line, size_t *len)
 772 {
 773     if (!pwm)
 774         return GPG_ERR_INV_ARG;
 775
 776     if (assuan_pending_line(pwm->ctx))
 777         return assuan_read_line(pwm->ctx, line, len);
 778
 779     return GPG_ERR_NO_DATA;
 780 }
 781
 782 void pwmd_close(pwm_t *pwm)
 783 {
 784     if (!pwm)
 785         return;
 786
 787     if (pwm->ctx)
 788         assuan_disconnect(pwm->ctx);
 789
 790     if (pwm->password)
 791         xfree(pwm->password);
 792
 793     if (pwm->title)
 794         xfree(pwm->title);
 795
 796     if (pwm->desc)
 797         xfree(pwm->desc);
 798
 799     if (pwm->prompt)
 800         xfree(pwm->prompt);
 801
 802     if (pwm->pinentry_tty)
 803         xfree(pwm->pinentry_tty);
 804
 805     if (pwm->pinentry_display)
 806         xfree(pwm->pinentry_display);
 807
 808     if (pwm->pinentry_term)
 809         xfree(pwm->pinentry_term);
 810
 811     if (pwm->lcctype)
 812         xfree(pwm->lcctype);
 813
 814     if (pwm->lcmessages)
 815         xfree(pwm->lcmessages);
 816
 817     if (pwm->filename)
 818         xfree(pwm->filename);
 819
 820 #ifdef WITH_TCP
 821     if (pwm->result)
 822         xfree(pwm->result);
 823
 824     if (pwm->tcp_conn)
 825         free_tcp_conn(pwm->tcp_conn);
 826
 827 #endif
 828     xfree(pwm);
 829 }
 830
 831 static int mem_realloc_cb(void *data, const void *buffer, size_t len)
 832 {
 833     membuf_t *mem = (membuf_t *)data;
 834     void *p;
 835
 836     if (!buffer)
 837         return 0;
 838
 839     if ((p = xrealloc(mem->buf, mem->len + len)) == NULL)
 840         return 1;
 841
 842     mem->buf = p;
 843     memcpy((char *)mem->buf + mem->len, buffer, len);
 844     mem->len += len;
 845     return 0;
 846 }
 847
 848 void pwmd_free_result(void *data)
 849 {
 850     xfree(data);
 851 }
 852
 853 static int _inquire_cb(void *data, const char *keyword)
 854 {
 855     pwm_t *pwm = (pwm_t *)data;
 856     gpg_error_t rc = 0;
 857     int flags = fcntl(pwm->fd, F_GETFL);
 858
 859     /* Shouldn't get this far without a callback. */
 860     if (!pwm->inquire_func)
 861         return GPG_ERR_INV_ARG;
 862
 863     /*
 864      * Since the socket file descriptor is probably set to non-blocking, set to
 865      * blocking to prevent GPG_ERR_EAGAIN errors. This should be fixes when
 866      * asynchronous INQUIRE is supported by either libassuan or a later
 867      * libpwmd.
 868      */
 869     fcntl(pwm->fd, F_SETFL, 0);
 870
 871     for (;;) {
 872         char *result = NULL;
 873         size_t len;
 874         gpg_error_t arc;
 875
 876         rc = pwm->inquire_func(pwm->inquire_data, keyword, rc, &result, &len);
 877         rc = gpg_err_code(rc);
 878
 879         if (rc == GPG_ERR_EOF || !rc) {
 880             if (len <= 0 || !result || !*result) {
 881                 rc = 0;
 882                 break;
 883             }
 884
 885             arc = assuan_send_data(pwm->ctx, result, len);
 886
 887             if (rc == GPG_ERR_EOF) {
 888                 rc = arc;
 889                 break;
 890             }
 891
 892             rc = arc;
 893         }
 894         else if (rc)
 895             break;
 896     }
 897
 898     fcntl(pwm->fd, F_SETFL, flags);
 899     return rc;
 900 }
 901
 902 gpg_error_t pwmd_finalize(pwm_t *pwm)
 903 {
 904     if (!pwm || pwm->cmd == ASYNC_CMD_NONE || pwm->state != ASYNC_DONE)
 905         return GPG_ERR_INV_ARG;
 906
 907     pwm->state = ASYNC_INIT;
 908     pwm->cmd = ASYNC_CMD_NONE;
 909
 910 #ifdef WITH_TCP
 911     if (pwm->cmd == ASYNC_CMD_CONNECT || pwm->cmd == ASYNC_CMD_DNS) {
 912         gpg_error_t rc = pwm->tcp_conn->rc;
 913
 914         if (pwm->result)
 915             xfree(pwm->result);
 916
 917         pwm->result = NULL;
 918
 919         /* pwm is no longer a valid handle. */
 920         if (rc)
 921             pwmd_close(pwm);
 922
 923         return 0;
 924     }
 925 #endif
 926
 927     if (pwm->fd < 0)
 928         return GPG_ERR_INV_ARG;
 929
 930     pwm->ntries = 0;
 931 #ifdef WITH_PINENTRY
 932     pwm->is_open_cmd = 0;
 933 #endif
 934     return 0;
 935 }
 936
 937 static gpg_error_t do_nb_command(pwm_t *pwm, const char *cmd, const char *arg)
 938 {
 939     char *buf;
 940     gpg_error_t rc;
 941     size_t len = strlen(cmd) + 2;
 942
 943     len += arg ? strlen(arg) : 0;
 944
 945     if (pwm->state != ASYNC_INIT)
 946         return GPG_ERR_INV_STATE;
 947
 948     buf = (char *)xmalloc(len);
 949
 950     if (!buf) {
 951         rc = gpg_error_from_errno(ENOMEM);
 952         goto fail;
 953     }
 954
 955     snprintf(buf, len, "%s %s", cmd, arg ? arg : "");
 956     rc = assuan_write_line(pwm->ctx, buf);
 957     xfree(buf);
 958
 959     if (!rc)
 960         pwm->state = ASYNC_PROCESS;
 961
 962 fail:
 963     return rc;
 964 }
 965
 966 gpg_error_t pwmd_open_async(pwm_t *pwm, const char *filename)
 967 {
 968     if (!pwm || !filename)
 969         return GPG_ERR_INV_ARG;
 970
 971     /* For pinentry retries. */
 972     if (!pwm->is_open_cmd) {
 973         if (pwm->filename)
 974             xfree(pwm->filename);
 975
 976         pwm->filename = xstrdup(filename);
 977     }
 978
 979     pwm->is_open_cmd = 1;
 980     return do_nb_command(pwm, "OPEN", filename);
 981 }
 982
 983 gpg_error_t pwmd_save_async(pwm_t *pwm)
 984 {
 985     if (!pwm)
 986         return GPG_ERR_INV_ARG;
 987
 988     return do_nb_command(pwm, "SAVE", NULL);
 989 }
 990
 991 gpg_error_t pwmd_get_result(pwm_t *pwm, const char **result)
 992 {
 993     if (!pwm || !result)
 994         return GPG_ERR_INV_ARG;
 995
 996     if (pwm->state != ASYNC_DONE)
 997         return GPG_ERR_INV_STATE;
 998
 999     if (!pwm->result)
1000         return GPG_ERR_NO_DATA;
1001
1002     *result = pwm->result;
1003     return 0;
1004 }
1005
1006 static gpg_error_t assuan_command(pwm_t *pwm, assuan_context_t ctx,
1007         char **result, const char *cmd);
1008 pwmd_async_t pwmd_process(pwm_t *pwm, gpg_error_t *rc)
1009 {
1010     fd_set fds;
1011     int n;
1012     struct timeval tv = {0, 0};
1013
1014     *rc = 0;
1015
1016     if (!pwm) {
1017         *rc = GPG_ERR_INV_ARG;
1018         return ASYNC_DONE;
1019     }
1020
1021 #ifdef WITH_TCP
1022     if (pwm->cmd == ASYNC_CMD_DNS) {
1023         fd_set rfds, wfds;
1024
1025         if (pwm->tcp_conn->rc) {
1026             *rc = pwm->tcp_conn->rc;
1027             close(pwm->tcp_conn->fd);
1028             pwm->state = ASYNC_DONE;
1029             return pwm->state;
1030         }
1031
1032         FD_ZERO(&rfds);
1033         FD_ZERO(&wfds);
1034         n = ares_fds(pwm->tcp_conn->chan, &rfds, &wfds);
1035
1036         /* Shouldn't happen. */
1037         if (!n)
1038             return pwm->state;
1039
1040         n = select(n, &rfds, &wfds, NULL, &tv);
1041
1042         if (n > 0)
1043             ares_process(pwm->tcp_conn->chan, &rfds, &wfds);
1044
1045         return pwm->state;
1046     }
1047     else if (pwm->cmd == ASYNC_CMD_CONNECT) {
1048         if (pwm->tcp_conn->rc == GPG_ERR_EINPROGRESS) {
1049             int ret;
1050             socklen_t len = sizeof(int);
1051
1052             FD_ZERO(&fds);
1053             FD_SET(pwm->tcp_conn->fd, &fds);
1054             n = select(pwm->tcp_conn->fd+1, NULL, &fds, NULL, &tv);
1055
1056             if (!n || !FD_ISSET(pwm->tcp_conn->fd, &fds))
1057                 return pwm->state;
1058             else if (n == -1) {
1059                 *rc = gpg_error_from_syserror();
1060                 close(pwm->tcp_conn->fd);
1061                 pwm->state = ASYNC_DONE;
1062                 return pwm->state;
1063             }
1064
1065             ret = getsockopt(pwm->tcp_conn->fd, SOL_SOCKET, SO_ERROR, &n, &len);
1066             if (ret || n) {
1067                 *rc = ret ? gpg_error_from_syserror() : gpg_error_from_errno(n);
1068                 close(pwm->tcp_conn->fd);
1069                 pwm->state = ASYNC_DONE;
1070                 return pwm->state;
1071             }
1072         }
1073         else if (pwm->tcp_conn->rc) {
1074             *rc = pwm->tcp_conn->rc;
1075             close(pwm->tcp_conn->fd);
1076             pwm->state = ASYNC_DONE;
1077             return pwm->state;
1078         }
1079
1080         fcntl(pwm->tcp_conn->fd, F_SETFL, 0);
1081         setup_context(pwm, rc);
1082         pwm->state = ASYNC_DONE;
1083         return pwm->state;
1084     }
1085 #endif
1086
1087     if (pwm->fd < 0) {
1088         *rc = GPG_ERR_INV_ARG;
1089         return ASYNC_DONE;
1090     }
1091     else if (pwm->state == ASYNC_DONE)
1092         return pwm->state;
1093     else if (pwm->state == ASYNC_INIT) {
1094         /* This will allow pending status messages to be parsed. */
1095         *rc = assuan_command(pwm, pwm->ctx, NULL, "NOP");
1096         return pwm->state;
1097     }
1098
1099     /* For pinentry retries. */
1100     if (pwm->is_open_cmd && gpg_err_code(*rc) == EPWMD_BADKEY &&
1101             ++pwm->ntries < pwm->pinentry_tries) {
1102         pwm->state = ASYNC_INIT;
1103         *rc = pwmd_open_async(pwm, pwm->filename);
1104     }
1105
1106     return pwm->state;
1107 }
1108
1109 static gpg_error_t assuan_command(pwm_t *pwm, assuan_context_t ctx,
1110         char **result, const char *cmd)
1111 {
1112     membuf_t data;
1113     gpg_error_t rc;
1114
1115     data.len = 0;
1116     data.buf = NULL;
1117
1118     rc = assuan_transact(ctx, cmd, mem_realloc_cb, &data, _inquire_cb, pwm,
1119             pwm->status_func, pwm->status_data);
1120
1121     if (rc) {
1122         if (data.buf) {
1123             xfree(data.buf);
1124             data.buf = NULL;
1125         }
1126     }
1127     else {
1128         if (data.buf) {
1129             mem_realloc_cb(&data, "", 1);
1130             *result = (char *)data.buf;
1131         }
1132     }
1133
1134     return gpg_err_code(rc);
1135 }
1136
1137 gpg_error_t pwmd_inquire(pwm_t *pwm, const char *cmd, pwmd_inquire_fn fn,
1138         void *data)
1139 {
1140     if (!pwm || !cmd || !fn)
1141         return GPG_ERR_INV_ARG;
1142
1143     pwm->inquire_func = fn;
1144     pwm->inquire_data = data;
1145     return assuan_command(pwm, pwm->ctx, NULL, cmd);
1146 }
1147
1148 gpg_error_t pwmd_terminate_pinentry(pwm_t *pwm)
1149 {
1150 #ifndef WITH_PINENTRY
1151     return GPG_ERR_NOT_IMPLEMENTED;
1152 #else
1153     pid_t pid = pwm->pid;
1154
1155     pwm->pid = -1;
1156
1157     if (!pwm || pid == -1)
1158         return GPG_ERR_INV_ARG;
1159
1160     if (kill(pid, 0) == 0) {
1161         if (kill(pid, SIGTERM) == -1) {
1162             if (kill(pid, SIGKILL) == -1)
1163                 return gpg_error_from_errno(errno);
1164         }
1165
1166         pwm->pin_error = GPG_ERR_TIMEOUT;
1167     }
1168     else
1169         return gpg_error_from_errno(errno);
1170
1171     return 0;
1172 #endif
1173 }
1174
1175 #ifdef WITH_PINENTRY
1176 static gpg_error_t set_pinentry_strings(pwm_t *pwm, int which)
1177 {
1178     char *buf;
1179     char tmp[ASSUAN_LINELENGTH];
1180     gpg_error_t error;
1181
1182     if (!pwm->title)
1183         pwm->title = xstrdup(N_("LibPWMD"));
1184
1185     if (!pwm->prompt)
1186         pwm->prompt = xstrdup(N_("Passphrase:"));
1187
1188     if (!pwm->desc && !which)
1189         pwm->desc = xstrdup(N_("Enter a passphrase."));
1190
1191     if (which == 1) {
1192         snprintf(tmp, sizeof(tmp), "SETERROR %s", N_("Invalid passphrase, please try again."));
1193         buf = xstrdup(tmp);
1194     }
1195     else if (which == 2) {
1196         snprintf(tmp, sizeof(tmp), "SETERROR %s", N_("Please type the passphrase again for confirmation."));
1197         buf = xstrdup(tmp);
1198     }
1199     else {
1200         buf = (char *)xmalloc(strlen("SETERROR ") + strlen(pwm->desc) + 1);
1201         sprintf(buf, "SETERROR %s", pwm->desc);
1202     }
1203
1204     error = pinentry_command(pwm, NULL, buf);
1205     xfree(buf);
1206
1207     if (error)
1208         return error;
1209
1210     buf = (char *)xmalloc(strlen("SETPROMPT ") + strlen(pwm->prompt) + 1);
1211     sprintf(buf, "SETPROMPT %s", pwm->prompt);
1212     error = pinentry_command(pwm, NULL, buf);
1213     xfree(buf);
1214
1215     if (error)
1216         return error;
1217
1218     buf = (char *)xmalloc(strlen("SETDESC ") + strlen(pwm->title) + 1);
1219     sprintf(buf, "SETDESC %s", pwm->title);
1220     error = pinentry_command(pwm, NULL, buf);
1221     xfree(buf);
1222     return error;
1223 }
1224
1225 static void update_pinentry_settings(pwm_t *pwm)
1226 {
1227     FILE *fp;
1228     char buf[LINE_MAX];
1229     struct passwd *pw = getpwuid(getuid());
1230     char *p;
1231
1232     snprintf(buf, sizeof(buf), "%s/.pwmd/pinentry.conf", pw->pw_dir);
1233
1234     if ((fp = fopen(buf, "r")) == NULL)
1235         return;
1236
1237     while ((p = fgets(buf, sizeof(buf), fp)) != NULL) {
1238         char name[32], val[256];
1239
1240         if (sscanf(p, " %31[a-zA-Z] = %255s", name, val) != 2)
1241             continue;
1242
1243         if (strcasecmp(name, "TTYNAME") == 0) {
1244             xfree(pwm->pinentry_tty);
1245             pwm->pinentry_tty = xstrdup(val);
1246         }
1247         else if (strcasecmp(name, "TTYTYPE") == 0) {
1248             xfree(pwm->pinentry_term);
1249             pwm->pinentry_term = xstrdup(val);
1250         }
1251         else if (strcasecmp(name, "DISPLAY") == 0) {
1252             xfree(pwm->pinentry_display);
1253             pwm->pinentry_display = xstrdup(val);
1254         }
1255         else if (strcasecmp(name, "PATH") == 0) {
1256             xfree(pwm->pinentry_path);
1257             pwm->pinentry_path = xstrdup(val);
1258         }
1259     }
1260
1261     fclose(fp);
1262 }
1263
1264 static gpg_error_t launch_pinentry(pwm_t *pwm)
1265 {
1266     int rc;
1267     assuan_context_t ctx;
1268     int child_list[] = {-1};
1269     char *display = getenv("DISPLAY");
1270     const char *argv[10];
1271     const char **p = argv;
1272     int have_display = 0;
1273     char *tty = NULL;
1274
1275     update_pinentry_settings(pwm);
1276
1277     if (pwm->pinentry_display || display)
1278         have_display = 1;
1279     else {
1280         tty = pwm->pinentry_tty ? pwm->pinentry_tty : ttyname(STDOUT_FILENO);
1281
1282         if (!tty)
1283             return gpg_error_from_errno(errno);
1284     }
1285
1286     if (!have_display && !tty)
1287         return GPG_ERR_ENOTTY;
1288
1289     *p++ = "pinentry";
1290     *p++ = have_display ? "--display" : "--ttyname";
1291     *p++ = have_display ? pwm->pinentry_display ? pwm->pinentry_display : display : tty;
1292
1293     if (pwm->lcctype) {
1294         *p++ = "--lc-ctype";
1295         *p++ = pwm->lcctype;
1296     }
1297
1298     if (pwm->lcmessages) {
1299         *p++ = "--lc-messages";
1300         *p++ = pwm->lcmessages;
1301     }
1302
1303     *p = NULL;
1304
1305     if (!have_display) {
1306         *p++ = "--ttytype";
1307         *p++ = pwm->pinentry_term ? pwm->pinentry_term : getenv("TERM");
1308         *p = NULL;
1309     }
1310
1311     rc = assuan_pipe_connect(&ctx, pwm->pinentry_path ? pwm->pinentry_path : PINENTRY_PATH, argv, child_list);
1312
1313     if (rc)
1314         return rc;
1315
1316     pwm->pid = assuan_get_pid(ctx);
1317     pwm->pctx = ctx;
1318     return set_pinentry_strings(pwm, 0);
1319 }
1320
1321 static gpg_error_t pinentry_command(pwm_t *pwm, char **result, const char *cmd)
1322 {
1323     gpg_error_t n;
1324
1325     if (!pwm->pctx) {
1326         n = launch_pinentry(pwm);
1327
1328         if (n)
1329             return n;
1330     }
1331
1332     return assuan_command(pwm, pwm->pctx, result, cmd);
1333 }
1334
1335 static void pinentry_disconnect(pwm_t *pwm)
1336 {
1337     if (pwm->pctx)
1338         assuan_disconnect(pwm->pctx);
1339
1340     pwm->pctx = NULL;
1341     pwm->pid = -1;
1342 }
1343
1344 /*
1345  * Only called from a child process.
1346  */
1347 static void catchsig(int sig)
1348 {
1349     switch (sig) {
1350         case SIGALRM:
1351             if (gelapsed++ >= gtimeout) {
1352                 global_error = pwmd_terminate_pinentry(gpwm);
1353
1354                 if (!global_error)
1355                     global_error = GPG_ERR_TIMEOUT;
1356
1357                 break;
1358             }
1359
1360             alarm(1);
1361             break;
1362         default:
1363             break;
1364     }
1365 }
1366 #endif
1367
1368 /*
1369  * Borrowed from libassuan.
1370  */
1371 static char *percent_escape(const char *atext)
1372 {
1373     const unsigned char *s;
1374     int len = strlen(atext) * 3 + 1;
1375     char *buf = (char *)xmalloc(len), *p = buf;
1376
1377     if (!buf)
1378         return NULL;
1379
1380     for (s=(const unsigned char *)atext; *s; s++) {
1381         if (*s < ' ') {
1382             sprintf (p, "%%%02X", *s);
1383             p += 3;
1384         }
1385         else
1386             *p++ = *s;
1387     }
1388
1389     *p = 0;
1390     return buf;
1391 }
1392
1393 static gpg_error_t send_command(pwm_t *pwm, char **result, const char *cmd)
1394 {
1395     if (!cmd)
1396         return GPG_ERR_INV_ARG;
1397
1398     return assuan_command(pwm, pwm->ctx, result, cmd);
1399 }
1400
1401 gpg_error_t pwmd_command_ap(pwm_t *pwm, char **result, const char *cmd,
1402         va_list ap)
1403 {
1404     char *buf;
1405     size_t len;
1406     gpg_error_t error;
1407
1408     if (!pwm || !cmd)
1409         return GPG_ERR_INV_ARG;
1410
1411     /*
1412      * C99 allows the dst pointer to be null which will calculate the length
1413      * of the would-be result and return it.
1414      */
1415     len = vsnprintf(NULL, 0, cmd, ap)+1;
1416     buf = (char *)xmalloc(len);
1417     len = vsnprintf(buf, len, cmd, ap);
1418     error = send_command(pwm, result, buf);
1419     xfree(buf);
1420     return error;
1421 }
1422
1423 /*
1424  * Avoid sending the BYE command here. libassuan will close the file
1425  * descriptor and release the assuan context. Use pwmd_close() instead.
1426  */
1427 gpg_error_t pwmd_command(pwm_t *pwm, char **result, const char *cmd, ...)
1428 {
1429     va_list ap;
1430     gpg_error_t error;
1431
1432     if (!pwm || !cmd)
1433         return GPG_ERR_INV_ARG;
1434
1435     *result = NULL;
1436     va_start(ap, cmd);
1437     error = pwmd_command_ap(pwm, result, cmd, ap);
1438     va_end(ap);
1439     return error;
1440 }
1441
1442 #ifdef WITH_PINENTRY
1443 static gpg_error_t do_getpin(pwm_t *pwm, char **result)
1444 {
1445     if (gtimeout) {
1446         signal(SIGALRM, catchsig);
1447         alarm(1);
1448     }
1449
1450     *result = NULL;
1451     return pinentry_command(pwm, result, "GETPIN");
1452 }
1453
1454 static gpg_error_t getpin(pwm_t *pwm, char **result, int *try_n, int which)
1455 {
1456     int pin_try = *try_n;
1457     gpg_error_t error;
1458
1459 getpin_again:
1460     *try_n = pin_try;
1461
1462     if (pin_try == -1) {
1463         error = set_pinentry_strings(pwm, which);
1464
1465         if (error) {
1466             pinentry_disconnect(pwm);
1467             return error;
1468         }
1469     }
1470     else {
1471         if (pwm->pinentry_tries-1 != pin_try) {
1472             error = set_pinentry_strings(pwm, 1);
1473
1474             if (error) {
1475                 pinentry_disconnect(pwm);
1476                 return error;
1477             }
1478         }
1479     }
1480
1481     error = do_getpin(pwm, result);
1482
1483     /*
1484      * Since there was input cancel any timeout setting.
1485      */
1486     alarm(0);
1487
1488     if (error) {
1489         if (error == GPG_ERR_CANCELED)
1490             return GPG_ERR_CANCELED;
1491
1492         if (pin_try != -1 && pin_try--)
1493             goto getpin_again;
1494
1495         if (pwm->pctx)
1496             pinentry_disconnect(pwm);
1497
1498         *try_n = pin_try;
1499         return error;
1500     }
1501
1502     return 0;
1503 }
1504 #endif
1505
1506 gpg_error_t pwmd_open_nb_finalize(pwm_t *pwm, pwmd_nb_status_t *pw)
1507 {
1508     gpg_error_t error;
1509
1510 #ifndef WITH_PINENTRY
1511     return GPG_ERR_NOT_IMPLEMENTED;
1512 #endif
1513
1514     if (!pwm || !pw || !pw->filename[0])
1515         return GPG_ERR_INV_ARG;
1516
1517     close(pw->fd);
1518
1519     if (pw->error) {
1520         error = pw->error;
1521         goto fail;
1522     }
1523
1524     if (pwm->filename)
1525         xfree(pwm->filename);
1526
1527     pwm->filename = xstrdup(pw->filename);
1528     memset(pw, 0, sizeof(pwmd_nb_status_t));
1529     return 0;
1530
1531 fail:
1532     memset(pw, 0, sizeof(pwmd_nb_status_t));
1533     return error;
1534 }
1535
1536 static gpg_error_t do_open_command(pwm_t *pwm, const char *filename, char *password)
1537 {
1538     char buf[ASSUAN_LINELENGTH];
1539     gpg_error_t error;
1540     char *result = NULL;
1541
1542     snprintf(buf, sizeof(buf), "OPEN %s %s", filename, password ? password : "");
1543     error = send_command(pwm, &result, buf);
1544     memset(buf, 0, sizeof(buf));
1545
1546     if (error && result)
1547         xfree(result);
1548
1549     return error;
1550 }
1551
1552 static int do_pwmd_open(pwm_t *pwm, gpg_error_t *error, const char *filename,
1553         int nb, int timeout)
1554 {
1555     char *result = NULL;
1556     char *password = NULL;
1557     char path[PATH_MAX];
1558 #ifdef WITH_PINENTRY
1559     int pin_try;
1560 #endif
1561
1562     if (!pwm || !filename || !*filename) {
1563         *error = GPG_ERR_INV_ARG;
1564         return nb ? -1 : 1;
1565     }
1566
1567 #ifdef WITH_PINENTRY
1568     pin_try = pwm->pinentry_tries - 1;
1569 #endif
1570
1571     /*
1572      * Avoid calling pinentry if the password is cached on the server or if
1573      * this is a new file.
1574      */
1575     *error = pwmd_command(pwm, &result, "GETCONFIG data_directory");
1576
1577     if (*error)
1578         return nb ? -1 : 1;
1579
1580     snprintf(path, sizeof(path), "%s/%s", result, filename);
1581     pwmd_free_result(result);
1582
1583     if (access(path, R_OK) == -1) {
1584         if (errno == ENOENT)
1585             goto gotpassword;
1586     }
1587
1588     *error = pwmd_command(pwm, &result, "ISCACHED %s", filename);
1589
1590     if (*error == EPWMD_CACHE_NOT_FOUND) {
1591         if (pwm->passfunc) {
1592             password = pwm->passfunc(pwm, pwm->passdata);
1593             goto gotpassword;
1594         }
1595
1596 #ifdef WITH_PINENTRY
1597         /*
1598          * Get the password from pinentry.
1599          */
1600         if (pwm->use_pinentry) {
1601             /*
1602              * Nonblocking is wanted. fork() then return a file descriptor
1603              * that the client can use to read() from.
1604              */
1605             if (nb) {
1606                 int p[2];
1607                 pid_t pid;
1608                 pwmd_nb_status_t pw;
1609
1610                 if (pipe(p) == -1) {
1611                     *error = gpg_error_from_syserror();
1612                     return -1;
1613                 }
1614
1615 #ifdef WITH_LIBPTH
1616                 pid = pth_fork();
1617 #else
1618                 pid = fork();
1619 #endif
1620
1621                 switch (pid) {
1622                     case 0:
1623                         close(p[0]);
1624                         strncpy(pw.filename, filename, sizeof(pw.filename));
1625                         pw.filename[sizeof(pw.filename)-1] = 0;
1626                         pw.fd = p[0];
1627
1628                         if (timeout > 0) {
1629                             gpwm = pwm;
1630                             gtimeout = timeout;
1631                             gelapsed = 0;
1632                         }
1633
1634 getpin_nb_again:
1635                         *error = getpin(pwm, &password, &pin_try, 0);
1636
1637                         if (*error) {
1638 getpin_nb_fail:
1639                             if (pwm->pctx)
1640                                 pinentry_disconnect(pwm);
1641
1642                             if (gtimeout && gelapsed >= gtimeout)
1643                                 *error = GPG_ERR_TIMEOUT;
1644
1645                             pw.error = *error;
1646 #ifdef WITH_LIBPTH
1647                             pth_write(p[1], &pw, sizeof(pw));
1648 #else
1649                             write(p[1], &pw, sizeof(pw));
1650 #endif
1651                             close(p[1]);
1652                             _exit(1);
1653                         }
1654
1655                         /*
1656                          * Don't count the time it takes to open the file
1657                          * which may have many iterations.
1658                          */
1659                         signal(SIGALRM, SIG_DFL);
1660                         *error = do_open_command(pwm, filename, password);
1661
1662                         if (timeout)
1663                             signal(SIGALRM, catchsig);
1664
1665                         if (pwm->pctx && *error == EPWMD_BADKEY) {
1666                             if (pin_try-- > 0)
1667                                 goto getpin_nb_again;
1668
1669                             goto getpin_nb_fail;
1670                         }
1671
1672                         pinentry_disconnect(pwm);
1673                         pw.error = 0;
1674 #ifdef WITH_LIBPTH
1675                         pth_write(p[1], &pw, sizeof(pw));
1676 #else
1677                         write(p[1], &pw, sizeof(pw));
1678 #endif
1679                         close(p[1]);
1680                         _exit(0);
1681                         break;
1682                     case -1:
1683                         *error = gpg_error_from_syserror();
1684                         close(p[0]);
1685                         close(p[1]);
1686                         return -1;
1687                     default:
1688                         break;
1689                 }
1690
1691                 close(p[1]);
1692                 *error = 0;
1693                 return p[0];
1694             }
1695         }
1696         else {
1697 #endif
1698             /*
1699              * Not using pinentry and the file was not found
1700              * in the cache.
1701              */
1702             password = pwm->password;
1703 #ifdef WITH_PINENTRY
1704         }
1705 #endif
1706     }
1707     else if (*error)
1708         return nb ? -1 : 1;
1709
1710 gotpassword:
1711     *error = do_open_command(pwm, filename, password);
1712
1713     /*
1714      * Keep the user defined password set with pwmd_setopt(). The password may
1715      * be needed later (pwmd_save()) depending on the pwmd file cache settings.
1716      */
1717     if (!pwm->passfunc && password && password != pwm->password)
1718         xfree(password);
1719
1720 #ifdef WITH_PINENTRY
1721     if (*error == EPWMD_BADKEY) {
1722         if (pin_try-- > 0 && !nb) {
1723             *error = pwmd_command(pwm, &result, "OPTION TITLE=%s",
1724                     N_("Invalid passphrase, please try again."));
1725
1726             if (*error)
1727                 return 1;
1728
1729             goto gotpassword;
1730         }
1731
1732         if (nb)
1733             pinentry_disconnect(pwm);
1734
1735         return nb ? -1 : 1;
1736     }
1737 #endif
1738
1739     if (!*error) {
1740         if (pwm->filename)
1741             xfree(pwm->filename);
1742
1743         pwm->filename = xstrdup(filename);
1744     }
1745
1746     /*
1747      * The file is cached or the file is a new file.
1748      */
1749     if (nb)
1750         return *error ? -1 : -2;
1751
1752     return *error ? 1 : 0;
1753 }
1754
1755 gpg_error_t pwmd_open(pwm_t *pwm, const char *filename)
1756 {
1757     gpg_error_t error;
1758
1759     do_pwmd_open(pwm, &error, filename, 0, 0);
1760     return error;
1761 }
1762
1763 int pwmd_open_nb(pwm_t *pwm, gpg_error_t *error, const char *filename,
1764         int timeout)
1765 {
1766 #ifndef WITH_PINENTRY
1767     *error = GPG_ERR_NOT_IMPLEMENTED;
1768     return -1;
1769 #else
1770     return do_pwmd_open(pwm, error, filename, 1, timeout);
1771 #endif
1772 }
1773
1774 #ifdef WITH_PINENTRY
1775 static gpg_error_t do_save_getpin(pwm_t *pwm, char **password)
1776 {
1777     int confirm = 0;
1778     gpg_error_t error;
1779     char *result = NULL;
1780     int pin_try = -1;
1781
1782 again:
1783     error = getpin(pwm, &result, &pin_try, confirm ? 2 : 0);
1784
1785     if (error) {
1786         if (pwm->pctx)
1787             pinentry_disconnect(pwm);
1788
1789         if (*password)
1790             xfree(*password);
1791
1792         return error;
1793     }
1794
1795     if (!confirm++) {
1796         *password = result;
1797         goto again;
1798     }
1799
1800     if (strcmp(*password, result)) {
1801         xfree(*password);
1802         xfree(result);
1803         pinentry_disconnect(pwm);
1804         error = EPWMD_BADKEY;
1805         return error;
1806     }
1807
1808     xfree(result);
1809     pinentry_disconnect(pwm);
1810     return 0;
1811 }
1812 #endif
1813
1814 static gpg_error_t do_save_command(pwm_t *pwm, char *password)
1815 {
1816     char buf[ASSUAN_LINELENGTH];
1817     gpg_error_t error;
1818     char *result = NULL;
1819
1820     snprintf(buf, sizeof(buf), "SAVE %s", password ? password : "");
1821     error = send_command(pwm, &result, buf);
1822     memset(&buf, 0, sizeof(buf));
1823
1824     if (error && result)
1825         xfree(result);
1826
1827     return error;
1828 }
1829
1830 gpg_error_t pwmd_save_nb_finalize(pwm_t *pwm, pwmd_nb_status_t *pw)
1831 {
1832     gpg_error_t rc;
1833
1834 #ifndef WITH_PINENTRY
1835     return GPG_ERR_NOT_IMPLEMENTED;
1836 #endif
1837
1838     if (!pwm || !pw || !pw->filename[0])
1839         return GPG_ERR_INV_ARG;
1840
1841     close(pw->fd);
1842     rc = pw->error;
1843     memset(pw, 0, sizeof(pwmd_nb_status_t));
1844     return rc;
1845 }
1846
1847 static int do_pwmd_save(pwm_t *pwm, gpg_error_t *error, int nb)
1848 {
1849     char *result = NULL;
1850     char *password = NULL;
1851
1852     if (!pwm) {
1853         *error = GPG_ERR_INV_ARG;
1854         return nb ? -1 : 1;
1855     }
1856
1857     if (pwm->use_pinentry || pwm->passfunc) {
1858         *error = pwmd_command(pwm, &result, "ISCACHED %s", pwm->filename);
1859
1860         if (*error == EPWMD_CACHE_NOT_FOUND) {
1861             if (pwm->passfunc)
1862                 password = (*pwm->passfunc)(pwm, pwm->passdata);
1863 #ifdef WITH_PINENTRY
1864             else if (pwm->use_pinentry) {
1865                 if (nb) {
1866                     int p[2];
1867                     pid_t pid;
1868                     pwmd_nb_status_t pw;
1869
1870                     if (pipe(p) == -1) {
1871                         *error = gpg_error_from_syserror();
1872                         return -1;
1873                     }
1874
1875 #ifdef WITH_LIBPTH
1876                     pid = pth_fork();
1877 #else
1878                     pid = fork();
1879 #endif
1880
1881                     switch (pid) {
1882                         case 0:
1883                             close(p[0]);
1884                             strncpy(pw.filename, pwm->filename, sizeof(pw.filename));
1885                             pw.filename[sizeof(pw.filename)-1] = 0;
1886                             pw.fd = p[0];
1887
1888                             do {
1889                                 password = NULL;
1890                                 *error = do_save_getpin(pwm, &password);
1891                             } while (*error == EPWMD_BADKEY);
1892
1893                             if (*error) {
1894                                 if (pwm->pctx)
1895                                     pinentry_disconnect(pwm);
1896
1897                                 pw.error = *error;
1898 #ifdef WITH_LIBPTH
1899                                 pth_write(p[1], &pw, sizeof(pw));
1900 #else
1901                                 write(p[1], &pw, sizeof(pw));
1902 #endif
1903                                 close(p[1]);
1904                                 _exit(1);
1905                             }
1906
1907                             *error = do_save_command(pwm, password);
1908                             pinentry_disconnect(pwm);
1909                             pw.error = *error;
1910 #ifdef WITH_LIBPTH
1911                             pth_write(p[1], &pw, sizeof(pw));
1912 #else
1913                             write(p[1], &pw, sizeof(pw));
1914 #endif
1915                             close(p[1]);
1916                             _exit(0);
1917                             break;
1918                         case -1:
1919                             *error = gpg_error_from_syserror();
1920                             close(p[0]);
1921                             close(p[1]);
1922                             return -1;
1923                         default:
1924                             break;
1925                     }
1926
1927                     close(p[1]);
1928                     *error = 0;
1929                     return p[0];
1930                 }
1931
1932                 *error = do_save_getpin(pwm, &password);
1933
1934                 if (*error)
1935                     return 1;
1936             }
1937 #endif
1938         }
1939         else {
1940             if (*error)
1941                 return nb ? -1 : 1;
1942         }
1943     }
1944     else
1945         password = pwm->password;
1946
1947     *error = do_save_command(pwm, password);
1948
1949     if (!pwm->passfunc && password && password != pwm->password)
1950         xfree(password);
1951
1952     if (nb)
1953         return *error ? -1 : -2;
1954
1955     return *error ? 1 : 0;
1956 }
1957
1958 int pwmd_save_nb(pwm_t *pwm, gpg_error_t *error)
1959 {
1960 #ifndef WITH_PINENTRY
1961     *error = GPG_ERR_NOT_IMPLEMENTED;
1962     return -1;
1963 #else
1964     return do_pwmd_save(pwm, error, 1);
1965 #endif
1966 }
1967
1968 gpg_error_t pwmd_save(pwm_t *pwm)
1969 {
1970     gpg_error_t error;
1971
1972     do_pwmd_save(pwm, &error, 0);
1973     return error;
1974 }
1975
1976 gpg_error_t pwmd_setopt(pwm_t *pwm, pwmd_option_t opt, ...)
1977 {
1978     va_list ap;
1979     int n = va_arg(ap, int);
1980     char *result;
1981     char *arg1;
1982     gpg_error_t error = 0;
1983
1984     if (!pwm)
1985         return GPG_ERR_INV_ARG;
1986
1987     va_start(ap, opt);
1988
1989     switch (opt) {
1990         case PWMD_OPTION_STATUS_FUNC:
1991             pwm->status_func = va_arg(ap, pwmd_status_fn);
1992             break;
1993         case PWMD_OPTION_STATUS_DATA:
1994             pwm->status_data = va_arg(ap, void *);
1995             break;
1996         case PWMD_OPTION_PASSWORD_FUNC:
1997             pwm->passfunc = va_arg(ap, pwmd_password_fn);
1998             break;
1999         case PWMD_OPTION_PASSWORD_DATA:
2000             pwm->passdata = va_arg(ap, void *);
2001             break;
2002         case PWMD_OPTION_PASSWORD:
2003             arg1 = va_arg(ap, char *);
2004
2005             if (pwm->password)
2006                 xfree(pwm->password);
2007
2008             pwm->password = xstrdup(arg1);
2009             break;
2010         case PWMD_OPTION_PINENTRY:
2011             n = va_arg(ap, int);
2012
2013             if (n != 0 && n != 1) {
2014                 va_end(ap);
2015                 error = GPG_ERR_INV_VALUE;
2016             }
2017             else {
2018                 pwm->use_pinentry = n;
2019                 error = pwmd_command(pwm, &result, "OPTION PINENTRY=%i",
2020                         !pwm->use_pinentry);
2021             }
2022             break;
2023 #ifdef WITH_PINENTRY
2024         case PWMD_OPTION_PINENTRY_TRIES:
2025             n = va_arg(ap, int);
2026
2027             if (n <= 0) {
2028                 va_end(ap);
2029                 error = GPG_ERR_INV_VALUE;
2030             }
2031             else
2032                 pwm->pinentry_tries = n;
2033             break;
2034 #endif
2035         case PWMD_OPTION_PINENTRY_TIMEOUT:
2036             n = va_arg(ap, int);
2037
2038             if (n < 0) {
2039                 va_end(ap);
2040                 error = GPG_ERR_INV_VALUE;
2041             }
2042             else
2043                 pwm->pinentry_timeout = n;
2044
2045             if (!pwm->use_pinentry)
2046                 error = pwmd_command(pwm, &result, "OPTION TIMEOUT=%i",
2047                         pwm->pinentry_timeout);
2048             break;
2049         case PWMD_OPTION_PINENTRY_PATH:
2050             if (pwm->pinentry_path)
2051                 xfree(pwm->pinentry_path);
2052
2053             pwm->pinentry_path = xstrdup(va_arg(ap, char *));
2054
2055             if (!pwm->use_pinentry)
2056                 error = pwmd_command(pwm, &result, "OPTION PATH=%s",
2057                         pwm->pinentry_path);
2058             break;
2059         case PWMD_OPTION_PINENTRY_TTY:
2060             if (pwm->pinentry_tty)
2061                 xfree(pwm->pinentry_tty);
2062
2063             pwm->pinentry_tty = xstrdup(va_arg(ap, char *));
2064
2065             if (!pwm->use_pinentry)
2066                 error = pwmd_command(pwm, &result, "OPTION TTY=%s",
2067                         pwm->pinentry_tty);
2068             break;
2069         case PWMD_OPTION_PINENTRY_DISPLAY:
2070             if (pwm->pinentry_display)
2071                 xfree(pwm->pinentry_display);
2072
2073             pwm->pinentry_display = xstrdup(va_arg(ap, char *));
2074
2075             if (!pwm->use_pinentry)
2076                 error = pwmd_command(pwm, &result, "OPTION DISPLAY=%s",
2077                         pwm->pinentry_display);
2078             break;
2079         case PWMD_OPTION_PINENTRY_TERM:
2080             if (pwm->pinentry_term)
2081                 xfree(pwm->pinentry_term);
2082
2083             pwm->pinentry_term = xstrdup(va_arg(ap, char *));
2084
2085             if (!pwm->use_pinentry)
2086                 error = pwmd_command(pwm, &result, "OPTION TTYTYPE=%s",
2087                         pwm->pinentry_term);
2088             break;
2089         case PWMD_OPTION_PINENTRY_TITLE:
2090             if (pwm->title)
2091                 xfree(pwm->title);
2092
2093             pwm->title = percent_escape(va_arg(ap, char *));
2094
2095             if (!pwm->use_pinentry)
2096                 error = pwmd_command(pwm, &result, "OPTION TITLE=%s",
2097                         pwm->title);
2098             break;
2099         case PWMD_OPTION_PINENTRY_PROMPT:
2100             if (pwm->prompt)
2101                 xfree(pwm->prompt);
2102
2103             pwm->prompt = percent_escape(va_arg(ap, char *));
2104
2105             if (!pwm->use_pinentry)
2106                 error = pwmd_command(pwm, &result, "OPTION PROMPT=%s",
2107                         pwm->prompt);
2108             break;
2109         case PWMD_OPTION_PINENTRY_DESC:
2110             if (pwm->desc)
2111                 xfree(pwm->desc);
2112
2113             pwm->desc = percent_escape(va_arg(ap, char *));
2114
2115             if (!pwm->use_pinentry)
2116                 error = pwmd_command(pwm, &result, "OPTION DESC=%s",
2117                         pwm->desc);
2118             break;
2119         case PWMD_OPTION_PINENTRY_LC_CTYPE:
2120             if (pwm->lcctype)
2121                 xfree(pwm->lcctype);
2122
2123             pwm->lcctype = xstrdup(va_arg(ap, char *));
2124
2125             if (!pwm->use_pinentry)
2126                 error = pwmd_command(pwm, &result, "OPTION LC_CTYPE=%s",
2127                         pwm->lcctype);
2128             break;
2129         case PWMD_OPTION_PINENTRY_LC_MESSAGES:
2130             if (pwm->lcmessages)
2131                 xfree(pwm->lcmessages);
2132
2133             pwm->lcmessages = xstrdup(va_arg(ap, char *));
2134
2135             if (!pwm->use_pinentry)
2136                 error = pwmd_command(pwm, &result, "OPTION LC_MESSAGES=%s",
2137                         pwm->lcmessages);
2138             break;
2139         default:
2140             error = GPG_ERR_NOT_IMPLEMENTED;
2141             break;
2142     }
2143
2144     va_end(ap);
2145     return error;
2146 }
2147
2148 /*
2149  * Prevent requiring assuan.h when setting ctx. The ctx is really an
2150  * assuan_context_t *.
2151  */
2152 gpg_error_t pwmd_assuan_ctx(pwm_t *pwm, void *ctx, int *fd)
2153 {
2154     if (!pwm)
2155         return GPG_ERR_INV_ARG;
2156
2157     ctx = pwm->ctx;
2158     *fd = pwm->fd;
2159     return 0;
2160 }