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 }
 261
 262 /*
 263  * Sets common options from both pwmd_tcp_connect() and
 264  * pwmd_tcp_connect_async().
 265  */
 266 static gpg_error_t init_tcp_conn(pwmd_tcp_conn_t **dst, const char *host,
 267         int port, const char *identity, const char *user, const char *hosts,
 268         int get)
 269 {
 270     pwmd_tcp_conn_t *conn;
 271     gpg_error_t rc = 0;
 272
 273     if (get) {
 274         if (!host)
 275             return GPG_ERR_INV_ARG;
 276     }
 277     else {
 278         if (!host || !identity || !user || !hosts)
 279             return GPG_ERR_INV_ARG;
 280     }
 281
 282     conn = xcalloc(1, sizeof(pwmd_tcp_conn_t));
 283
 284     if (!conn)
 285         return gpg_error_from_errno(ENOMEM);
 286
 287     conn->port = port == -1 ? 22 : port;
 288     conn->host = xstrdup(host);
 289
 290     if (!conn->host) {
 291         rc = gpg_error_from_errno(ENOMEM);
 292         goto fail;
 293     }
 294
 295     if (!get) {
 296         conn->identity = xstrdup(identity);
 297
 298         if (!conn->identity) {
 299             rc = gpg_error_from_errno(ENOMEM);
 300             goto fail;
 301         }
 302
 303         conn->identity_pub = xmalloc(strlen(conn->identity)+5);
 304
 305         if (!conn->identity_pub) {
 306             rc = gpg_error_from_errno(ENOMEM);
 307             goto fail;
 308         }
 309
 310         sprintf(conn->identity_pub, "%s.pub", conn->identity);
 311         conn->username = xstrdup(user);
 312
 313         if (!conn->username) {
 314             rc = gpg_error_from_errno(ENOMEM);
 315             goto fail;
 316         }
 317
 318         conn->known_hosts = xstrdup(hosts);
 319
 320         if (!conn->known_hosts) {
 321             rc = gpg_error_from_errno(ENOMEM);
 322             goto fail;
 323         }
 324     }
 325
 326     *dst = conn;
 327     return 0;
 328
 329 fail:
 330     free_tcp_conn(conn);
 331     return rc;
 332 }
 333
 334 static gpg_error_t do_connect(pwm_t *pwm, int prot, void *addr)
 335 {
 336     struct sockaddr_in their_addr;
 337
 338     pwm->tcp_conn->fd = socket(prot, SOCK_STREAM, 0);
 339
 340     if (pwm->tcp_conn->fd == -1)
 341         return gpg_error_from_syserror();
 342
 343     if (pwm->tcp_conn->async)
 344         fcntl(pwm->tcp_conn->fd, F_SETFL, O_NONBLOCK);
 345
 346     pwm->cmd = ASYNC_CMD_CONNECT;
 347     their_addr.sin_family = prot;
 348     their_addr.sin_port = htons(pwm->tcp_conn->port);
 349     their_addr.sin_addr = *((struct in_addr *)addr);
 350     memset(their_addr.sin_zero, '\0', sizeof their_addr.sin_zero);
 351
 352 #ifdef WITH_LIBPTH
 353     if (pth_connect(pwm->tcp_conn->fd, (struct sockaddr *)&their_addr,
 354                 sizeof(their_addr)) == -1)
 355 #else
 356     if (connect(pwm->tcp_conn->fd, (struct sockaddr *)&their_addr,
 357                 sizeof(their_addr)) == -1)
 358 #endif
 359         return gpg_error_from_syserror();
 360
 361     return 0;
 362 }
 363
 364 static gpg_error_t ares_error_to_pwmd(int status)
 365 {
 366     if (status != ARES_SUCCESS)
 367         warnx("%s", ares_strerror(status));
 368
 369     switch (status) {
 370         case ARES_ENODATA:
 371         case ARES_EFORMERR:
 372         case ARES_ENOTFOUND:
 373             return GPG_ERR_UNKNOWN_HOST;
 374         case ARES_ESERVFAIL:
 375              return GPG_ERR_EHOSTDOWN;
 376         case ARES_ETIMEOUT:
 377             return GPG_ERR_TIMEOUT;
 378         case ARES_ENOMEM:
 379             return gpg_error_from_errno(ENOMEM);
 380         case ARES_ECONNREFUSED:
 381             return GPG_ERR_ECONNREFUSED;
 382         default:
 383             /* FIXME ??? */
 384             return GPG_ERR_EHOSTUNREACH;
 385     }
 386
 387     return ARES_SUCCESS;
 388 }
 389
 390 static void dns_resolve_cb(void *arg, int status, int timeouts,
 391         unsigned char *abuf, int alen)
 392 {
 393     pwm_t *pwm = arg;
 394     int rc;
 395     struct hostent *he;
 396
 397     if (status == ARES_EDESTRUCTION)
 398         return;
 399
 400     if (status != ARES_SUCCESS) {
 401         pwm->tcp_conn->rc = ares_error_to_pwmd(status);
 402         return;
 403     }
 404
 405     //FIXME localhost. works with ipv4. maybe local system config error
 406     /* Check for an IPv6 address first. */
 407     rc = ares_parse_a_reply(abuf, alen, &he, NULL, NULL);
 408
 409     if (rc != ARES_SUCCESS) {
 410         if (rc != ARES_ENODATA) {
 411             pwm->tcp_conn->rc = ares_error_to_pwmd(status);
 412             return;
 413         }
 414
 415         rc = ares_parse_aaaa_reply(abuf, alen, &he, NULL, NULL);
 416
 417         if (rc != ARES_SUCCESS) {
 418             pwm->tcp_conn->rc = ares_error_to_pwmd(status);
 419             return;
 420         }
 421     }
 422
 423     pwm->tcp_conn->he = he;
 424     pwm->tcp_conn->rc = do_connect(pwm, he->h_addrtype, he->h_addr);
 425 }
 426
 427 pwm_t *_do_pwmd_tcp_connect_async(const char *host, int port,
 428         const char *identity, const char *user, const char *known_hosts,
 429         gpg_error_t *rc, pwmd_async_cmd_t which)
 430 {
 431     pwmd_tcp_conn_t *conn;
 432     pwm_t *pwm;
 433
 434     *rc = init_tcp_conn(&conn, host, port, identity, user, known_hosts,
 435             which == ASYNC_CMD_HOSTKEY ? 1 : 0);
 436
 437     if (*rc)
 438         return NULL;
 439
 440     if ((pwm = (pwm_t *)xcalloc(1, sizeof(pwm_t))) == NULL) {
 441         *rc = gpg_error_from_syserror();
 442         free_tcp_conn(conn);
 443         return NULL;
 444     }
 445
 446     conn->async = 1;
 447     pwm->tcp_conn = conn;
 448     pwm->tcp_conn->cmd = which;
 449
 450     if (pwm->tcp_conn->cmd == ASYNC_CMD_HOSTKEY)
 451         pwm->tcp_conn->get_only = 1;
 452
 453     pwm->cmd = ASYNC_CMD_DNS;
 454     pwm->state = ASYNC_PROCESS;
 455     ares_init(&pwm->tcp_conn->chan);
 456     ares_query(pwm->tcp_conn->chan, pwm->tcp_conn->host, ns_c_any, ns_t_any,
 457             dns_resolve_cb, pwm);
 458     return pwm;
 459 }
 460
 461 pwm_t *pwmd_tcp_connect_async(const char *host, int port, const char *identity,
 462         const char *user, const char *known_hosts, gpg_error_t *rc)
 463 {
 464     return _do_pwmd_tcp_connect_async(host, port, identity, user, known_hosts,
 465             rc, ASYNC_CMD_CONNECT);
 466 }
 467
 468 void *_ssh_malloc(size_t size, void **data)
 469 {
 470     return xmalloc(size);
 471 }
 472
 473 void _ssh_free(void *ptr, void **data)
 474 {
 475     xfree(ptr);
 476 }
 477
 478 void *_ssh_realloc(void *ptr, size_t size, void **data)
 479 {
 480     return xrealloc(ptr, size);
 481 }
 482
 483 static char *to_hex(const char *str, size_t slen)
 484 {
 485     int i;
 486     char *buf = xmalloc(slen*2+1);
 487
 488     if (!buf)
 489         return NULL;
 490
 491     for (i = 0, buf[0] = 0; i < slen; i++) {
 492         char tmp[3];
 493
 494         sprintf(tmp, "%02x", (unsigned char)str[i]);
 495         strcat(buf, tmp);
 496     }
 497
 498     return buf;
 499 }
 500
 501 static int verify_host_key(pwm_t *pwm)
 502 {
 503     FILE *fp = fopen(pwm->tcp_conn->known_hosts, "r");
 504     char *buf, *p;
 505
 506     if (!fp)
 507         return 1;
 508
 509     buf = xmalloc(LINE_MAX);
 510
 511     if (!buf)
 512         goto fail;
 513
 514     while ((p = fgets(buf, LINE_MAX, fp))) {
 515         if (*p == '#' || isspace(*p))
 516             continue;
 517
 518         if (p[strlen(p)-1] == '\n')
 519             p[strlen(p)-1] = 0;
 520
 521         if (!strcmp(buf, pwm->tcp_conn->hostkey))
 522             goto done;
 523     }
 524
 525 fail:
 526     if (buf)
 527         xfree(buf);
 528
 529     fclose(fp);
 530     return 1;
 531
 532 done:
 533     xfree(buf);
 534     fclose(fp);
 535     return 0;
 536 }
 537
 538 static gpg_error_t authenticate_ssh(pwm_t *pwm)
 539 {
 540     const char *fp = libssh2_hostkey_hash(pwm->tcp_conn->session,
 541             LIBSSH2_HOSTKEY_HASH_SHA1);
 542     char *userauth;
 543
 544     pwm->tcp_conn->hostkey = to_hex(fp, 20);
 545
 546     if (!pwm->tcp_conn->hostkey)
 547         return gpg_error_from_errno(ENOMEM);
 548
 549     if (pwm->tcp_conn->get_only)
 550         return 0;
 551
 552     if (!fp || verify_host_key(pwm))
 553         return GPG_ERR_CHECKSUM;
 554
 555     userauth = libssh2_userauth_list(pwm->tcp_conn->session,
 556             pwm->tcp_conn->username, strlen(pwm->tcp_conn->username));
 557
 558     if (!userauth || !strstr(userauth, "publickey"))
 559         return GPG_ERR_BAD_PIN_METHOD;
 560
 561     if (libssh2_userauth_publickey_fromfile(pwm->tcp_conn->session,
 562                 pwm->tcp_conn->username, pwm->tcp_conn->identity_pub,
 563                 pwm->tcp_conn->identity, NULL))
 564         return GPG_ERR_BAD_SECKEY;
 565
 566     return 0;
 567 }
 568
 569 static pwm_t *setup_context(pwm_t *pwm, gpg_error_t *rc)
 570 {
 571     assuan_context_t ctx;
 572     struct assuan_io_hooks io_hooks = {read_hook, write_hook};
 573
 574     pwm->tcp_conn->session = libssh2_session_init_ex(_ssh_malloc, _ssh_free,
 575             _ssh_realloc, NULL);
 576
 577     if (!pwm->tcp_conn->session) {
 578         *rc = gpg_error_from_errno(ENOMEM);
 579         goto fail;
 580     }
 581
 582     if (libssh2_session_startup(pwm->tcp_conn->session, pwm->tcp_conn->fd)) {
 583         *rc = GPG_ERR_ASSUAN_SERVER_FAULT;
 584         goto fail;
 585     }
 586
 587     *rc = authenticate_ssh(pwm);
 588
 589     if (*rc)
 590         goto fail;
 591
 592     /* pwmd_get_hostkey(). */
 593     if (pwm->tcp_conn->get_only) {
 594         pwm->result = xstrdup(pwm->tcp_conn->hostkey);
 595
 596         if (!pwm->result) {
 597             *rc = gpg_error_from_errno(ENOMEM);
 598             goto fail;
 599         }
 600
 601         return pwm;
 602     }
 603
 604     pwm->tcp_conn->channel = libssh2_channel_open_session(pwm->tcp_conn->session);
 605
 606     if (!pwm->tcp_conn->channel) {
 607         *rc = GPG_ERR_ASSUAN_SERVER_FAULT;
 608         goto fail;
 609     }
 610
 611     if (libssh2_channel_shell(pwm->tcp_conn->channel)) {
 612         *rc = GPG_ERR_ASSUAN_SERVER_FAULT;
 613         goto fail;
 614     }
 615
 616     assuan_set_io_hooks(&io_hooks);
 617     *rc = assuan_socket_connect_fd(&ctx, pwm->tcp_conn->fd, 0, pwm);
 618
 619     if (*rc)
 620         goto fail;
 621
 622     assuan_set_finish_handler(ctx, _ssh_assuan_deinit);
 623     return _socket_connect_finalize(pwm, ctx);
 624
 625 fail:
 626     if (!pwm->tcp_conn->async)
 627         pwmd_close(pwm);
 628
 629     return NULL;
 630 }
 631
 632 static pwm_t *_do_pwmd_tcp_connect(const char *host, int port,
 633         const char *identity, const char *user, const char *known_hosts,
 634         gpg_error_t *rc, int get)
 635 {
 636     pwm_t *pwm = NULL;
 637     pwmd_tcp_conn_t *conn;
 638
 639     *rc = init_tcp_conn(&conn, host, port, identity, user, known_hosts, get);
 640
 641     if (*rc)
 642         return NULL;
 643
 644     if ((pwm = (pwm_t *)xcalloc(1, sizeof(pwm_t))) == NULL) {
 645         *rc = gpg_error_from_errno(ENOMEM);
 646         goto fail;
 647     }
 648
 649     pwm->tcp_conn = conn;
 650     pwm->tcp_conn->get_only = get;
 651     pwm->cmd = ASYNC_CMD_DNS;
 652     ares_init(&pwm->tcp_conn->chan);
 653     ares_query(pwm->tcp_conn->chan, pwm->tcp_conn->host, ns_c_any, ns_t_any,
 654             dns_resolve_cb, pwm);
 655
 656     /* dns_resolve_cb() may have already been called. */
 657     if (pwm->tcp_conn->rc) {
 658         *rc = pwm->tcp_conn->rc;
 659         goto fail;
 660     }
 661
 662     /*
 663      * Fake a blocking DNS lookup. libcares does a better job than
 664      * getaddrinfo().
 665      */
 666     do {
 667         fd_set rfds, wfds;
 668         int n;
 669         struct timeval tv;
 670
 671         FD_ZERO(&rfds);
 672         FD_ZERO(&wfds);
 673         n = ares_fds(pwm->tcp_conn->chan, &rfds, &wfds);
 674         ares_timeout(pwm->tcp_conn->chan, NULL, &tv);
 675 #ifdef WITH_LIBPTH
 676         n = pth_select(n, &rfds, &wfds, NULL, &tv);
 677 #else
 678         n = select(n, &rfds, &wfds, NULL, &tv);
 679 #endif
 680
 681         if (n == -1) {
 682             *rc = gpg_error_from_syserror();
 683             goto fail;
 684         }
 685         else if (n == 0) {
 686             *rc = GPG_ERR_TIMEOUT;
 687             goto fail;
 688         }
 689
 690         ares_process(pwm->tcp_conn->chan, &rfds, &wfds);
 691
 692         if (pwm->tcp_conn->rc)
 693             break;
 694     } while (pwm->cmd == ASYNC_CMD_DNS);
 695
 696     if (pwm->tcp_conn->rc) {
 697         *rc = pwm->tcp_conn->rc;
 698         goto fail;
 699     }
 700
 701     return setup_context(pwm, rc);
 702
 703 fail:
 704     pwmd_close(pwm);
 705     return NULL;
 706 }
 707
 708 pwm_t *pwmd_tcp_connect(const char *host, int port, const char *identity,
 709         const char *user, const char *known_hosts, gpg_error_t *rc)
 710 {
 711     return _do_pwmd_tcp_connect(host, port, identity, user, known_hosts, rc, 0);
 712 }
 713
 714 /* Must free the result with pwmd_free_result(). */
 715 char *pwmd_get_hostkey(const char *host, int port, gpg_error_t *rc)
 716 {
 717     char *hostkey;
 718     pwm_t *pwm;
 719
 720     pwm = _do_pwmd_tcp_connect(host, port, NULL, NULL, NULL, rc, 1);
 721
 722     if (!pwm)
 723         return NULL;
 724
 725     hostkey = xstrdup(pwm->tcp_conn->hostkey);
 726
 727     if (!hostkey)
 728         *rc = gpg_error_from_errno(ENOMEM);
 729
 730     pwmd_close(pwm);
 731     return hostkey;
 732 }
 733
 734 pwm_t *pwmd_get_hostkey_async(const char *host, int port, gpg_error_t *rc)
 735 {
 736     return _do_pwmd_tcp_connect_async(host, port, NULL, NULL, NULL, rc,
 737             ASYNC_CMD_HOSTKEY);
 738 }
 739 #endif
 740
 741 pwm_t *pwmd_connect(const char *path, gpg_error_t *rc)
 742 {
 743     pwm_t *pwm = NULL;
 744     char *socketpath = NULL;
 745     struct passwd *pw;
 746     assuan_context_t ctx;
 747
 748     if (!path) {
 749         pw = getpwuid(getuid());
 750         socketpath = (char *)xmalloc(strlen(pw->pw_dir) + strlen("/.pwmd/socket") + 1);
 751         sprintf(socketpath, "%s/.pwmd/socket", pw->pw_dir);
 752     }
 753     else
 754         socketpath = xstrdup(path);
 755
 756     *rc = assuan_socket_connect_ext(&ctx, socketpath, -1, 0);
 757     xfree(socketpath);
 758
 759     if (*rc)
 760         return NULL;
 761
 762     if ((pwm = (pwm_t *)xcalloc(1, sizeof(pwm_t))) == NULL) {
 763         *rc = gpg_error_from_syserror();
 764         return NULL;
 765     }
 766
 767     return _socket_connect_finalize(pwm, ctx);
 768 }
 769
 770 gpg_error_t pwmd_pending_line(pwm_t *pwm, char **line, size_t *len)
 771 {
 772     if (!pwm)
 773         return GPG_ERR_INV_ARG;
 774
 775     if (assuan_pending_line(pwm->ctx))
 776         return assuan_read_line(pwm->ctx, line, len);
 777
 778     return GPG_ERR_NO_DATA;
 779 }
 780
 781 void pwmd_close(pwm_t *pwm)
 782 {
 783     if (!pwm)
 784         return;
 785
 786     if (pwm->ctx)
 787         assuan_disconnect(pwm->ctx);
 788
 789     if (pwm->password)
 790         xfree(pwm->password);
 791
 792     if (pwm->title)
 793         xfree(pwm->title);
 794
 795     if (pwm->desc)
 796         xfree(pwm->desc);
 797
 798     if (pwm->prompt)
 799         xfree(pwm->prompt);
 800
 801     if (pwm->pinentry_tty)
 802         xfree(pwm->pinentry_tty);
 803
 804     if (pwm->pinentry_display)
 805         xfree(pwm->pinentry_display);
 806
 807     if (pwm->pinentry_term)
 808         xfree(pwm->pinentry_term);
 809
 810     if (pwm->filename)
 811         xfree(pwm->filename);
 812
 813 #ifdef WITH_TCP
 814     if (pwm->result)
 815         xfree(pwm->result);
 816
 817     if (pwm->tcp_conn)
 818         free_tcp_conn(pwm->tcp_conn);
 819
 820 #endif
 821     xfree(pwm);
 822 }
 823
 824 static int mem_realloc_cb(void *data, const void *buffer, size_t len)
 825 {
 826     membuf_t *mem = (membuf_t *)data;
 827     void *p;
 828
 829     if (!buffer)
 830         return 0;
 831
 832     if ((p = xrealloc(mem->buf, mem->len + len)) == NULL)
 833         return 1;
 834
 835     mem->buf = p;
 836     memcpy((char *)mem->buf + mem->len, buffer, len);
 837     mem->len += len;
 838     return 0;
 839 }
 840
 841 void pwmd_free_result(void *data)
 842 {
 843     xfree(data);
 844 }
 845
 846 static int _inquire_cb(void *data, const char *keyword)
 847 {
 848     pwm_t *pwm = (pwm_t *)data;
 849     gpg_error_t rc = 0;
 850     int flags = fcntl(pwm->fd, F_GETFL);
 851
 852     /* Shouldn't get this far without a callback. */
 853     if (!pwm->inquire_func)
 854         return GPG_ERR_INV_ARG;
 855
 856     /*
 857      * Since the socket file descriptor is probably set to non-blocking, set to
 858      * blocking to prevent GPG_ERR_EAGAIN errors. This should be fixes when
 859      * asynchronous INQUIRE is supported by either libassuan or a later
 860      * libpwmd.
 861      */
 862     fcntl(pwm->fd, F_SETFL, 0);
 863
 864     for (;;) {
 865         char *result = NULL;
 866         size_t len;
 867         gpg_error_t arc;
 868
 869         rc = pwm->inquire_func(pwm->inquire_data, keyword, rc, &result, &len);
 870         rc = gpg_err_code(rc);
 871
 872         if (rc == GPG_ERR_EOF || !rc) {
 873             if (len <= 0 || !result || !*result) {
 874                 rc = 0;
 875                 break;
 876             }
 877
 878             arc = assuan_send_data(pwm->ctx, result, len);
 879
 880             if (rc == GPG_ERR_EOF) {
 881                 rc = arc;
 882                 break;
 883             }
 884
 885             rc = arc;
 886         }
 887         else if (rc)
 888             break;
 889     }
 890
 891     fcntl(pwm->fd, F_SETFL, flags);
 892     return rc;
 893 }
 894
 895 gpg_error_t pwmd_finalize(pwm_t *pwm)
 896 {
 897     if (!pwm || pwm->cmd == ASYNC_CMD_NONE || pwm->state != ASYNC_DONE)
 898         return GPG_ERR_INV_ARG;
 899
 900     pwm->state = ASYNC_INIT;
 901     pwm->cmd = ASYNC_CMD_NONE;
 902
 903 #ifdef WITH_TCP
 904     if (pwm->cmd == ASYNC_CMD_CONNECT || pwm->cmd == ASYNC_CMD_DNS) {
 905         gpg_error_t rc = pwm->tcp_conn->rc;
 906
 907         if (pwm->result)
 908             xfree(pwm->result);
 909
 910         pwm->result = NULL;
 911
 912         /* pwm is no longer a valid handle. */
 913         if (rc)
 914             pwmd_close(pwm);
 915
 916         return 0;
 917     }
 918 #endif
 919
 920     if (pwm->fd < 0)
 921         return GPG_ERR_INV_ARG;
 922
 923     pwm->ntries = 0;
 924 #ifdef WITH_PINENTRY
 925     pwm->is_open_cmd = 0;
 926 #endif
 927     return 0;
 928 }
 929
 930 static gpg_error_t do_nb_command(pwm_t *pwm, const char *cmd, const char *arg)
 931 {
 932     char *buf;
 933     gpg_error_t rc;
 934     size_t len = strlen(cmd) + 2;
 935
 936     len += arg ? strlen(arg) : 0;
 937
 938     if (pwm->state != ASYNC_INIT)
 939         return GPG_ERR_INV_STATE;
 940
 941     buf = (char *)xmalloc(len);
 942
 943     if (!buf) {
 944         rc = gpg_error_from_errno(ENOMEM);
 945         goto fail;
 946     }
 947
 948     snprintf(buf, len, "%s %s", cmd, arg ? arg : "");
 949     rc = assuan_write_line(pwm->ctx, buf);
 950     xfree(buf);
 951
 952     if (!rc)
 953         pwm->state = ASYNC_PROCESS;
 954
 955 fail:
 956     return rc;
 957 }
 958
 959 gpg_error_t pwmd_open_async(pwm_t *pwm, const char *filename)
 960 {
 961     if (!pwm || !filename)
 962         return GPG_ERR_INV_ARG;
 963
 964     /* For pinentry retries. */
 965     if (!pwm->is_open_cmd) {
 966         if (pwm->filename)
 967             xfree(pwm->filename);
 968
 969         pwm->filename = xstrdup(filename);
 970     }
 971
 972     pwm->is_open_cmd = 1;
 973     return do_nb_command(pwm, "OPEN", filename);
 974 }
 975
 976 gpg_error_t pwmd_save_async(pwm_t *pwm)
 977 {
 978     if (!pwm)
 979         return GPG_ERR_INV_ARG;
 980
 981     return do_nb_command(pwm, "SAVE", NULL);
 982 }
 983
 984 static gpg_error_t parse_assuan_line(pwm_t *pwm)
 985 {
 986     gpg_error_t rc;
 987     char *line;
 988     size_t len;
 989
 990     rc = assuan_read_line(pwm->ctx, &line, &len);
 991
 992     if (!rc) {
 993         if (line[0] == 'O' && line[1] == 'K' &&
 994                 (line[2] == 0 || line[2] == ' ')) {
 995             pwm->state = ASYNC_DONE;
 996         }
 997         else if (line[0] == '#') {
 998         }
 999         else if (line[0] == 'S' && (line[1] == 0 || line[1] == ' ')) {
1000             if (pwm->status_func) {
1001                 pwm->status_func(pwm->status_data,
1002                         line[1] == 0 ? line+1 : line+2);
1003             }
1004         }
1005         else if (line[0] == 'E' && line[1] == 'R' && line[2] == 'R' &&
1006                 (line[3] == 0 || line[3] == ' ')) {
1007             line += 4;
1008             rc = atoi(line);
1009             pwm->state = ASYNC_DONE;
1010         }
1011     }
1012
1013     return rc;
1014 }
1015
1016 gpg_error_t pwmd_get_result(pwm_t *pwm, const char **result)
1017 {
1018     if (!pwm || !result)
1019         return GPG_ERR_INV_ARG;
1020
1021     if (pwm->state != ASYNC_DONE)
1022         return GPG_ERR_INV_STATE;
1023
1024     if (!pwm->result)
1025         return GPG_ERR_NO_DATA;
1026
1027     *result = pwm->result;
1028     return 0;
1029 }
1030
1031 pwmd_async_t pwmd_process(pwm_t *pwm, gpg_error_t *rc)
1032 {
1033     fd_set fds;
1034     int n;
1035     struct timeval tv = {0, 0};
1036
1037     *rc = 0;
1038
1039     if (!pwm) {
1040         *rc = GPG_ERR_INV_ARG;
1041         return ASYNC_DONE;
1042     }
1043
1044 #ifdef WITH_TCP
1045     if (pwm->cmd == ASYNC_CMD_DNS) {
1046         fd_set rfds, wfds;
1047
1048         if (pwm->tcp_conn->rc) {
1049             *rc = pwm->tcp_conn->rc;
1050             close(pwm->tcp_conn->fd);
1051             pwm->state = ASYNC_DONE;
1052             return pwm->state;
1053         }
1054
1055         FD_ZERO(&rfds);
1056         FD_ZERO(&wfds);
1057         n = ares_fds(pwm->tcp_conn->chan, &rfds, &wfds);
1058
1059         /* Shouldn't happen. */
1060         if (!n)
1061             return pwm->state;
1062
1063         n = select(n, &rfds, &wfds, NULL, &tv);
1064
1065         if (n > 0)
1066             ares_process(pwm->tcp_conn->chan, &rfds, &wfds);
1067
1068         return pwm->state;
1069     }
1070     else if (pwm->cmd == ASYNC_CMD_CONNECT) {
1071         if (pwm->tcp_conn->rc == GPG_ERR_EINPROGRESS) {
1072             int ret;
1073             socklen_t len = sizeof(int);
1074
1075             FD_ZERO(&fds);
1076             FD_SET(pwm->tcp_conn->fd, &fds);
1077             n = select(pwm->tcp_conn->fd+1, NULL, &fds, NULL, &tv);
1078
1079             if (!n || !FD_ISSET(pwm->tcp_conn->fd, &fds))
1080                 return pwm->state;
1081             else if (n == -1) {
1082                 *rc = gpg_error_from_syserror();
1083                 close(pwm->tcp_conn->fd);
1084                 pwm->state = ASYNC_DONE;
1085                 return pwm->state;
1086             }
1087
1088             ret = getsockopt(pwm->tcp_conn->fd, SOL_SOCKET, SO_ERROR, &n, &len);
1089             if (ret || n) {
1090                 *rc = ret ? gpg_error_from_syserror() : gpg_error_from_errno(n);
1091                 close(pwm->tcp_conn->fd);
1092                 pwm->state = ASYNC_DONE;
1093                 return pwm->state;
1094             }
1095         }
1096         else if (pwm->tcp_conn->rc) {
1097             *rc = pwm->tcp_conn->rc;
1098             close(pwm->tcp_conn->fd);
1099             pwm->state = ASYNC_DONE;
1100             return pwm->state;
1101         }
1102
1103         fcntl(pwm->tcp_conn->fd, F_SETFL, 0);
1104         setup_context(pwm, rc);
1105         pwm->state = ASYNC_DONE;
1106         return pwm->state;
1107     }
1108 #endif
1109
1110     if (pwm->fd < 0) {
1111         *rc = GPG_ERR_INV_ARG;
1112         return ASYNC_DONE;
1113     }
1114     else if (pwm->state == ASYNC_DONE)
1115         return pwm->state;
1116     else if (pwm->state == ASYNC_INIT) {
1117         *rc = GPG_ERR_INV_STATE;
1118         return ASYNC_DONE;
1119     }
1120
1121     FD_ZERO(&fds);
1122     FD_SET(pwm->fd, &fds);
1123 #ifdef WITH_LIBPTH
1124     n = pth_select(pwm->fd+1, &fds, NULL, NULL, &tv);
1125 #else
1126     n = select(pwm->fd+1, &fds, NULL, NULL, &tv);
1127 #endif
1128
1129     if (n > 0) {
1130         if (FD_ISSET(pwm->fd, &fds))
1131             *rc = parse_assuan_line(pwm);
1132     }
1133
1134     while (!*rc && assuan_pending_line(pwm->ctx))
1135         *rc = parse_assuan_line(pwm);
1136
1137     if (pwm->is_open_cmd && gpg_err_code(*rc) == EPWMD_BADKEY &&
1138             ++pwm->ntries < pwm->pinentry_tries) {
1139         pwm->state = ASYNC_INIT;
1140         *rc = pwmd_open_async(pwm, pwm->filename);
1141     }
1142
1143     return pwm->state;
1144 }
1145
1146 static gpg_error_t assuan_command(pwm_t *pwm, assuan_context_t ctx,
1147         char **result, const char *cmd)
1148 {
1149     membuf_t data;
1150     gpg_error_t rc;
1151
1152     data.len = 0;
1153     data.buf = NULL;
1154
1155     rc = assuan_transact(ctx, cmd, mem_realloc_cb, &data, _inquire_cb, pwm,
1156             pwm->status_func, pwm->status_data);
1157
1158     if (rc) {
1159         if (data.buf) {
1160             xfree(data.buf);
1161             data.buf = NULL;
1162         }
1163     }
1164     else {
1165         if (data.buf) {
1166             mem_realloc_cb(&data, "", 1);
1167             *result = (char *)data.buf;
1168         }
1169     }
1170
1171     return gpg_err_code(rc);
1172 }
1173
1174 gpg_error_t pwmd_inquire(pwm_t *pwm, const char *cmd, pwmd_inquire_fn fn,
1175         void *data)
1176 {
1177     if (!pwm || !cmd || !fn)
1178         return GPG_ERR_INV_ARG;
1179
1180     pwm->inquire_func = fn;
1181     pwm->inquire_data = data;
1182     return assuan_command(pwm, pwm->ctx, NULL, cmd);
1183 }
1184
1185 gpg_error_t pwmd_terminate_pinentry(pwm_t *pwm)
1186 {
1187 #ifndef WITH_PINENTRY
1188     return GPG_ERR_NOT_IMPLEMENTED;
1189 #else
1190     if (!pwm || pwm->pid == -1)
1191         return GPG_ERR_INV_ARG;
1192
1193     if (kill(pwm->pid, 0) == 0) {
1194         if (kill(pwm->pid, SIGTERM) == -1) {
1195             if (kill(pwm->pid, SIGKILL) == -1)
1196                 return gpg_error_from_errno(errno);
1197         }
1198
1199         pwm->pin_error = GPG_ERR_TIMEOUT;
1200     }
1201     else
1202         return gpg_error_from_errno(errno);
1203
1204     return 0;
1205 #endif
1206 }
1207
1208 #ifdef WITH_PINENTRY
1209 static gpg_error_t set_pinentry_strings(pwm_t *pwm, int which)
1210 {
1211     char *buf;
1212     char tmp[ASSUAN_LINELENGTH];
1213     gpg_error_t error;
1214
1215     if (!pwm->title)
1216         pwm->title = xstrdup(N_("LibPWMD"));
1217
1218     if (!pwm->prompt)
1219         pwm->prompt = xstrdup(N_("Passphrase:"));
1220
1221     if (!pwm->desc && !which)
1222         pwm->desc = xstrdup(N_("Enter a passphrase."));
1223
1224     if (which == 1) {
1225         snprintf(tmp, sizeof(tmp), "SETERROR %s", N_("Invalid passphrase, please try again."));
1226         buf = xstrdup(tmp);
1227     }
1228     else if (which == 2) {
1229         snprintf(tmp, sizeof(tmp), "SETERROR %s", N_("Please type the passphrase again for confirmation."));
1230         buf = xstrdup(tmp);
1231     }
1232     else {
1233         buf = (char *)xmalloc(strlen("SETERROR ") + strlen(pwm->desc) + 1);
1234         sprintf(buf, "SETERROR %s", pwm->desc);
1235     }
1236
1237     error = pinentry_command(pwm, NULL, buf);
1238     xfree(buf);
1239
1240     if (error)
1241         return error;
1242
1243     buf = (char *)xmalloc(strlen("SETPROMPT ") + strlen(pwm->prompt) + 1);
1244     sprintf(buf, "SETPROMPT %s", pwm->prompt);
1245     error = pinentry_command(pwm, NULL, buf);
1246     xfree(buf);
1247
1248     if (error)
1249         return error;
1250
1251     buf = (char *)xmalloc(strlen("SETDESC ") + strlen(pwm->title) + 1);
1252     sprintf(buf, "SETDESC %s", pwm->title);
1253     error = pinentry_command(pwm, NULL, buf);
1254     xfree(buf);
1255     return error;
1256 }
1257
1258 static void update_pinentry_settings(pwm_t *pwm)
1259 {
1260     FILE *fp;
1261     char buf[LINE_MAX];
1262     struct passwd *pw = getpwuid(getuid());
1263     char *p;
1264
1265     snprintf(buf, sizeof(buf), "%s/.pwmd/pinentry.conf", pw->pw_dir);
1266
1267     if ((fp = fopen(buf, "r")) == NULL)
1268         return;
1269
1270     while ((p = fgets(buf, sizeof(buf), fp)) != NULL) {
1271         char name[32], val[256];
1272
1273         if (sscanf(p, " %31[a-zA-Z] = %255s", name, val) != 2)
1274             continue;
1275
1276         if (strcasecmp(name, "TTYNAME") == 0) {
1277             xfree(pwm->pinentry_tty);
1278             pwm->pinentry_tty = xstrdup(val);
1279         }
1280         else if (strcasecmp(name, "TTYTYPE") == 0) {
1281             xfree(pwm->pinentry_term);
1282             pwm->pinentry_term = xstrdup(val);
1283         }
1284         else if (strcasecmp(name, "DISPLAY") == 0) {
1285             xfree(pwm->pinentry_display);
1286             pwm->pinentry_display = xstrdup(val);
1287         }
1288         else if (strcasecmp(name, "PATH") == 0) {
1289             xfree(pwm->pinentry_path);
1290             pwm->pinentry_path = xstrdup(val);
1291         }
1292     }
1293
1294     fclose(fp);
1295 }
1296
1297 static gpg_error_t launch_pinentry(pwm_t *pwm)
1298 {
1299     int rc;
1300     assuan_context_t ctx;
1301     int child_list[] = {-1};
1302     char *display = getenv("DISPLAY");
1303     const char *argv[6];
1304     int have_display = 0;
1305     char *tty = NULL;
1306
1307     update_pinentry_settings(pwm);
1308
1309     if (pwm->pinentry_display || display)
1310         have_display = 1;
1311     else {
1312         tty = pwm->pinentry_tty ? pwm->pinentry_tty : ttyname(STDOUT_FILENO);
1313
1314         if (!tty)
1315             return gpg_error_from_errno(errno);
1316     }
1317
1318     if (!have_display && !tty)
1319         return GPG_ERR_ENOTTY;
1320
1321     argv[0] = "pinentry";
1322     argv[1] = have_display ? "--display" : "--ttyname";
1323     argv[2] = have_display ? pwm->pinentry_display ? pwm->pinentry_display : display : tty;
1324     argv[3] = NULL;
1325
1326     if (!have_display) {
1327         argv[3] = "--ttytype";
1328         argv[4] = pwm->pinentry_term ? pwm->pinentry_term : getenv("TERM");
1329         argv[5] = NULL;
1330     }
1331
1332     rc = assuan_pipe_connect(&ctx, pwm->pinentry_path ? pwm->pinentry_path : PINENTRY_PATH, argv, child_list);
1333
1334     if (rc)
1335         return rc;
1336
1337     pwm->pid = assuan_get_pid(ctx);
1338     pwm->pctx = ctx;
1339     return set_pinentry_strings(pwm, 0);
1340 }
1341
1342 static gpg_error_t pinentry_command(pwm_t *pwm, char **result, const char *cmd)
1343 {
1344     gpg_error_t n;
1345
1346     if (!pwm->pctx) {
1347         n = launch_pinentry(pwm);
1348
1349         if (n)
1350             return n;
1351     }
1352
1353     return assuan_command(pwm, pwm->pctx, result, cmd);
1354 }
1355
1356 static void pinentry_disconnect(pwm_t *pwm)
1357 {
1358     if (pwm->pctx)
1359         assuan_disconnect(pwm->pctx);
1360
1361     pwm->pctx = NULL;
1362     pwm->pid = -1;
1363 }
1364
1365 /*
1366  * Only called from a child process.
1367  */
1368 static void catchsig(int sig)
1369 {
1370     switch (sig) {
1371         case SIGALRM:
1372             if (gelapsed++ >= gtimeout) {
1373                 global_error = pwmd_terminate_pinentry(gpwm);
1374
1375                 if (!global_error)
1376                     global_error = GPG_ERR_TIMEOUT;
1377
1378                 break;
1379             }
1380
1381             alarm(1);
1382             break;
1383         default:
1384             break;
1385     }
1386 }
1387
1388 /*
1389  * Borrowed from libassuan.
1390  */
1391 static char *percent_escape(const char *atext)
1392 {
1393     const unsigned char *s;
1394     int len = strlen(atext) * 3 + 1;
1395     char *buf = (char *)xmalloc(len), *p = buf;
1396
1397     if (!buf)
1398         return NULL;
1399
1400     for (s=(const unsigned char *)atext; *s; s++) {
1401         if (*s < ' ') {
1402             sprintf (p, "%%%02X", *s);
1403             p += 3;
1404         }
1405         else
1406             *p++ = *s;
1407     }
1408
1409     *p = 0;
1410     return buf;
1411 }
1412 #endif
1413
1414 static gpg_error_t send_command(pwm_t *pwm, char **result, const char *cmd)
1415 {
1416     if (!cmd)
1417         return GPG_ERR_INV_ARG;
1418
1419     return assuan_command(pwm, pwm->ctx, result, cmd);
1420 }
1421
1422 gpg_error_t pwmd_command_ap(pwm_t *pwm, char **result, const char *cmd,
1423         va_list ap)
1424 {
1425     char *buf;
1426     size_t len;
1427     gpg_error_t error;
1428
1429     if (!pwm || !cmd)
1430         return GPG_ERR_INV_ARG;
1431
1432     /*
1433      * C99 allows the dst pointer to be null which will calculate the length
1434      * of the would-be result and return it.
1435      */
1436     len = vsnprintf(NULL, 0, cmd, ap)+1;
1437     buf = (char *)xmalloc(len);
1438     len = vsnprintf(buf, len, cmd, ap);
1439     error = send_command(pwm, result, buf);
1440     xfree(buf);
1441     return error;
1442 }
1443
1444 /*
1445  * Avoid sending the BYE command here. libassuan will close the file
1446  * descriptor and release the assuan context. Use pwmd_close() instead.
1447  */
1448 gpg_error_t pwmd_command(pwm_t *pwm, char **result, const char *cmd, ...)
1449 {
1450     va_list ap;
1451     gpg_error_t error;
1452
1453     if (!pwm || !cmd)
1454         return GPG_ERR_INV_ARG;
1455
1456     *result = NULL;
1457     va_start(ap, cmd);
1458     error = pwmd_command_ap(pwm, result, cmd, ap);
1459     va_end(ap);
1460     return error;
1461 }
1462
1463 #ifdef WITH_PINENTRY
1464 static gpg_error_t do_getpin(pwm_t *pwm, char **result)
1465 {
1466     if (gtimeout) {
1467         signal(SIGALRM, catchsig);
1468         alarm(1);
1469     }
1470
1471     *result = NULL;
1472     return pinentry_command(pwm, result, "GETPIN");
1473 }
1474
1475 static gpg_error_t getpin(pwm_t *pwm, char **result, int *try_n, int which)
1476 {
1477     int pin_try = *try_n;
1478     gpg_error_t error;
1479
1480 getpin_again:
1481     *try_n = pin_try;
1482
1483     if (pin_try == -1) {
1484         error = set_pinentry_strings(pwm, which);
1485
1486         if (error) {
1487             pinentry_disconnect(pwm);
1488             return error;
1489         }
1490     }
1491     else {
1492         if (pwm->pinentry_tries-1 != pin_try) {
1493             error = set_pinentry_strings(pwm, 1);
1494
1495             if (error) {
1496                 pinentry_disconnect(pwm);
1497                 return error;
1498             }
1499         }
1500     }
1501
1502     error = do_getpin(pwm, result);
1503
1504     /*
1505      * Since there was input cancel any timeout setting.
1506      */
1507     alarm(0);
1508
1509     if (error) {
1510         if (error == GPG_ERR_CANCELED)
1511             return GPG_ERR_CANCELED;
1512
1513         if (pin_try != -1 && pin_try--)
1514             goto getpin_again;
1515
1516         if (pwm->pctx)
1517             pinentry_disconnect(pwm);
1518
1519         *try_n = pin_try;
1520         return error;
1521     }
1522
1523     return 0;
1524 }
1525 #endif
1526
1527 gpg_error_t pwmd_open_nb_finalize(pwm_t *pwm, pwmd_nb_status_t *pw)
1528 {
1529     gpg_error_t error;
1530
1531 #ifndef WITH_PINENTRY
1532     return GPG_ERR_NOT_IMPLEMENTED;
1533 #endif
1534
1535     if (!pwm || !pw || !pw->filename[0])
1536         return GPG_ERR_INV_ARG;
1537
1538     close(pw->fd);
1539
1540     if (pw->error) {
1541         error = pw->error;
1542         goto fail;
1543     }
1544
1545     if (pwm->filename)
1546         xfree(pwm->filename);
1547
1548     pwm->filename = xstrdup(pw->filename);
1549     memset(pw, 0, sizeof(pwmd_nb_status_t));
1550     return 0;
1551
1552 fail:
1553     memset(pw, 0, sizeof(pwmd_nb_status_t));
1554     return error;
1555 }
1556
1557 static gpg_error_t do_open_command(pwm_t *pwm, const char *filename, char *password)
1558 {
1559     char buf[ASSUAN_LINELENGTH];
1560     gpg_error_t error;
1561     char *result = NULL;
1562
1563     snprintf(buf, sizeof(buf), "OPEN %s %s", filename, password ? password : "");
1564     error = send_command(pwm, &result, buf);
1565     memset(buf, 0, sizeof(buf));
1566
1567     if (error && result)
1568         xfree(result);
1569
1570     return error;
1571 }
1572
1573 static int do_pwmd_open(pwm_t *pwm, gpg_error_t *error, const char *filename,
1574         int nb, int timeout)
1575 {
1576     char *result = NULL;
1577     char *password = NULL;
1578     char path[PATH_MAX];
1579 #ifdef WITH_PINENTRY
1580     int pin_try;
1581 #endif
1582
1583     if (!pwm || !filename || !*filename) {
1584         *error = GPG_ERR_INV_ARG;
1585         return nb ? -1 : 1;
1586     }
1587
1588 #ifdef WITH_PINENTRY
1589     pin_try = pwm->pinentry_tries - 1;
1590 #endif
1591
1592     /*
1593      * Avoid calling pinentry if the password is cached on the server or if
1594      * this is a new file.
1595      */
1596     *error = pwmd_command(pwm, &result, "GETCONFIG data_directory");
1597
1598     if (*error)
1599         return nb ? -1 : 1;
1600
1601     snprintf(path, sizeof(path), "%s/%s", result, filename);
1602     pwmd_free_result(result);
1603
1604     if (access(path, R_OK) == -1) {
1605         if (errno == ENOENT)
1606             goto gotpassword;
1607     }
1608
1609     *error = pwmd_command(pwm, &result, "ISCACHED %s", filename);
1610
1611     if (*error == EPWMD_CACHE_NOT_FOUND) {
1612         if (pwm->passfunc) {
1613             password = pwm->passfunc(pwm, pwm->passdata);
1614             goto gotpassword;
1615         }
1616
1617 #ifdef WITH_PINENTRY
1618         /*
1619          * Get the password from pinentry.
1620          */
1621         if (pwm->use_pinentry) {
1622             /*
1623              * Nonblocking is wanted. fork() then return a file descriptor
1624              * that the client can use to read() from.
1625              */
1626             if (nb) {
1627                 int p[2];
1628                 pid_t pid;
1629                 pwmd_nb_status_t pw;
1630
1631                 if (pipe(p) == -1) {
1632                     *error = gpg_error_from_syserror();
1633                     return -1;
1634                 }
1635
1636 #ifdef WITH_LIBPTH
1637                 pid = pth_fork();
1638 #else
1639                 pid = fork();
1640 #endif
1641
1642                 switch (pid) {
1643                     case 0:
1644                         close(p[0]);
1645                         strncpy(pw.filename, filename, sizeof(pw.filename));
1646                         pw.filename[sizeof(pw.filename)-1] = 0;
1647                         pw.fd = p[0];
1648
1649                         if (timeout > 0) {
1650                             gpwm = pwm;
1651                             gtimeout = timeout;
1652                             gelapsed = 0;
1653                         }
1654
1655 getpin_nb_again:
1656                         *error = getpin(pwm, &password, &pin_try, 0);
1657
1658                         if (*error) {
1659 getpin_nb_fail:
1660                             if (pwm->pctx)
1661                                 pinentry_disconnect(pwm);
1662
1663                             if (gtimeout && gelapsed >= gtimeout)
1664                                 *error = GPG_ERR_TIMEOUT;
1665
1666                             pw.error = *error;
1667 #ifdef WITH_LIBPTH
1668                             pth_write(p[1], &pw, sizeof(pw));
1669 #else
1670                             write(p[1], &pw, sizeof(pw));
1671 #endif
1672                             close(p[1]);
1673                             _exit(1);
1674                         }
1675
1676                         /*
1677                          * Don't count the time it takes to open the file
1678                          * which may have many iterations.
1679                          */
1680                         signal(SIGALRM, SIG_DFL);
1681                         *error = do_open_command(pwm, filename, password);
1682
1683                         if (timeout)
1684                             signal(SIGALRM, catchsig);
1685
1686                         if (pwm->pctx && *error == EPWMD_BADKEY) {
1687                             if (pin_try-- > 0)
1688                                 goto getpin_nb_again;
1689
1690                             goto getpin_nb_fail;
1691                         }
1692
1693                         pinentry_disconnect(pwm);
1694                         pw.error = 0;
1695 #ifdef WITH_LIBPTH
1696                         pth_write(p[1], &pw, sizeof(pw));
1697 #else
1698                         write(p[1], &pw, sizeof(pw));
1699 #endif
1700                         close(p[1]);
1701                         _exit(0);
1702                         break;
1703                     case -1:
1704                         *error = gpg_error_from_syserror();
1705                         close(p[0]);
1706                         close(p[1]);
1707                         return -1;
1708                     default:
1709                         break;
1710                 }
1711
1712                 close(p[1]);
1713                 *error = 0;
1714                 return p[0];
1715             }
1716         }
1717         else {
1718 #endif
1719             /*
1720              * Not using pinentry and the file was not found
1721              * in the cache.
1722              */
1723             password = pwm->password;
1724 #ifdef WITH_PINENTRY
1725         }
1726 #endif
1727     }
1728     else if (*error)
1729         return nb ? -1 : 1;
1730
1731 gotpassword:
1732     *error = do_open_command(pwm, filename, password);
1733
1734     /*
1735      * Keep the user defined password set with pwmd_setopt(). The password may
1736      * be needed later (pwmd_save()) depending on the pwmd file cache settings.
1737      */
1738     if (!pwm->passfunc && password && password != pwm->password)
1739         xfree(password);
1740
1741 #ifdef WITH_PINENTRY
1742     if (*error == EPWMD_BADKEY) {
1743         if (pin_try-- > 0 && !nb) {
1744             *error = pwmd_command(pwm, &result, "OPTION TITLE=%s",
1745                     N_("Invalid passphrase, please try again."));
1746
1747             if (*error)
1748                 return 1;
1749
1750             goto gotpassword;
1751         }
1752
1753         if (nb)
1754             pinentry_disconnect(pwm);
1755
1756         return nb ? -1 : 1;
1757     }
1758 #endif
1759
1760     if (!*error) {
1761         if (pwm->filename)
1762             xfree(pwm->filename);
1763
1764         pwm->filename = xstrdup(filename);
1765     }
1766
1767     /*
1768      * The file is cached or the file is a new file.
1769      */
1770     if (nb)
1771         return *error ? -1 : -2;
1772
1773     return *error ? 1 : 0;
1774 }
1775
1776 gpg_error_t pwmd_open(pwm_t *pwm, const char *filename)
1777 {
1778     gpg_error_t error;
1779
1780     do_pwmd_open(pwm, &error, filename, 0, 0);
1781     return error;
1782 }
1783
1784 int pwmd_open_nb(pwm_t *pwm, gpg_error_t *error, const char *filename,
1785         int timeout)
1786 {
1787 #ifndef WITH_PINENTRY
1788     *error = GPG_ERR_NOT_IMPLEMENTED;
1789     return -1;
1790 #else
1791     return do_pwmd_open(pwm, error, filename, 1, timeout);
1792 #endif
1793 }
1794
1795 #ifdef WITH_PINENTRY
1796 static gpg_error_t do_save_getpin(pwm_t *pwm, char **password)
1797 {
1798     int confirm = 0;
1799     gpg_error_t error;
1800     char *result = NULL;
1801     int pin_try = -1;
1802
1803 again:
1804     error = getpin(pwm, &result, &pin_try, confirm ? 2 : 0);
1805
1806     if (error) {
1807         if (pwm->pctx)
1808             pinentry_disconnect(pwm);
1809
1810         if (*password)
1811             xfree(*password);
1812
1813         return error;
1814     }
1815
1816     if (!confirm++) {
1817         *password = result;
1818         goto again;
1819     }
1820
1821     if (strcmp(*password, result)) {
1822         xfree(*password);
1823         xfree(result);
1824         pinentry_disconnect(pwm);
1825         error = EPWMD_BADKEY;
1826         return error;
1827     }
1828
1829     xfree(result);
1830     pinentry_disconnect(pwm);
1831     return 0;
1832 }
1833 #endif
1834
1835 static gpg_error_t do_save_command(pwm_t *pwm, char *password)
1836 {
1837     char buf[ASSUAN_LINELENGTH];
1838     gpg_error_t error;
1839     char *result = NULL;
1840
1841     snprintf(buf, sizeof(buf), "SAVE %s", password ? password : "");
1842     error = send_command(pwm, &result, buf);
1843     memset(&buf, 0, sizeof(buf));
1844
1845     if (error && result)
1846         xfree(result);
1847
1848     return error;
1849 }
1850
1851 gpg_error_t pwmd_save_nb_finalize(pwm_t *pwm, pwmd_nb_status_t *pw)
1852 {
1853     gpg_error_t rc;
1854
1855 #ifndef WITH_PINENTRY
1856     return GPG_ERR_NOT_IMPLEMENTED;
1857 #endif
1858
1859     if (!pwm || !pw || !pw->filename[0])
1860         return GPG_ERR_INV_ARG;
1861
1862     close(pw->fd);
1863     rc = pw->error;
1864     memset(pw, 0, sizeof(pwmd_nb_status_t));
1865     return rc;
1866 }
1867
1868 static int do_pwmd_save(pwm_t *pwm, gpg_error_t *error, int nb)
1869 {
1870     char *result = NULL;
1871     char *password = NULL;
1872
1873     if (!pwm) {
1874         *error = GPG_ERR_INV_ARG;
1875         return nb ? -1 : 1;
1876     }
1877
1878     if (pwm->use_pinentry || pwm->passfunc) {
1879         *error = pwmd_command(pwm, &result, "ISCACHED %s", pwm->filename);
1880
1881         if (*error == EPWMD_CACHE_NOT_FOUND) {
1882 #ifdef WITH_PINENTRY
1883             if (pwm->use_pinentry) {
1884                 if (nb) {
1885                     int p[2];
1886                     pid_t pid;
1887                     pwmd_nb_status_t pw;
1888
1889                     if (pipe(p) == -1) {
1890                         *error = gpg_error_from_syserror();
1891                         return -1;
1892                     }
1893
1894 #ifdef WITH_LIBPTH
1895                     pid = pth_fork();
1896 #else
1897                     pid = fork();
1898 #endif
1899
1900                     switch (pid) {
1901                         case 0:
1902                             close(p[0]);
1903                             strncpy(pw.filename, pwm->filename, sizeof(pw.filename));
1904                             pw.filename[sizeof(pw.filename)-1] = 0;
1905                             pw.fd = p[0];
1906
1907                             do {
1908                                 password = NULL;
1909                                 *error = do_save_getpin(pwm, &password);
1910                             } while (*error == EPWMD_BADKEY);
1911
1912                             if (*error) {
1913                                 if (pwm->pctx)
1914                                     pinentry_disconnect(pwm);
1915
1916                                 pw.error = *error;
1917 #ifdef WITH_LIBPTH
1918                                 pth_write(p[1], &pw, sizeof(pw));
1919 #else
1920                                 write(p[1], &pw, sizeof(pw));
1921 #endif
1922                                 close(p[1]);
1923                                 _exit(1);
1924                             }
1925
1926                             *error = do_save_command(pwm, password);
1927                             pinentry_disconnect(pwm);
1928                             pw.error = *error;
1929 #ifdef WITH_LIBPTH
1930                             pth_write(p[1], &pw, sizeof(pw));
1931 #else
1932                             write(p[1], &pw, sizeof(pw));
1933 #endif
1934                             close(p[1]);
1935                             _exit(0);
1936                             break;
1937                         case -1:
1938                             *error = gpg_error_from_syserror();
1939                             close(p[0]);
1940                             close(p[1]);
1941                             return -1;
1942                         default:
1943                             break;
1944                     }
1945
1946                     close(p[1]);
1947                     *error = 0;
1948                     return p[0];
1949                 }
1950
1951                 *error = do_save_getpin(pwm, &password);
1952
1953                 if (*error)
1954                     return 1;
1955             }
1956             else {
1957 #endif
1958                 if (pwm->passfunc)
1959                     password = (*pwm->passfunc)(pwm, pwm->passdata);
1960 #ifdef WITH_PINENTRY
1961             }
1962 #endif
1963         }
1964         else {
1965             if (*error)
1966                 return nb ? -1 : 1;
1967         }
1968     }
1969     else
1970         password = pwm->password;
1971
1972     *error = do_save_command(pwm, password);
1973
1974     if (password && password != pwm->password)
1975         xfree(password);
1976
1977     if (nb)
1978         return *error ? -1 : -2;
1979
1980     return *error ? 1 : 0;
1981 }
1982
1983 int pwmd_save_nb(pwm_t *pwm, gpg_error_t *error)
1984 {
1985 #ifndef WITH_PINENTRY
1986     *error = GPG_ERR_NOT_IMPLEMENTED;
1987     return -1;
1988 #else
1989     return do_pwmd_save(pwm, error, 1);
1990 #endif
1991 }
1992
1993 gpg_error_t pwmd_save(pwm_t *pwm)
1994 {
1995     gpg_error_t error;
1996
1997     do_pwmd_save(pwm, &error, 0);
1998     return error;
1999 }
2000
2001 gpg_error_t pwmd_setopt(pwm_t *pwm, pwmd_option_t opt, ...)
2002 {
2003     va_list ap;
2004 #ifdef WITH_PINENTRY
2005     int n = va_arg(ap, int);
2006     char *result;
2007 #endif
2008     char *arg1;
2009     gpg_error_t error = 0;
2010
2011     if (!pwm)
2012         return GPG_ERR_INV_ARG;
2013
2014     va_start(ap, opt);
2015
2016     switch (opt) {
2017         case PWMD_OPTION_STATUS_FUNC:
2018             pwm->status_func = va_arg(ap, pwmd_status_fn);
2019             break;
2020         case PWMD_OPTION_STATUS_DATA:
2021             pwm->status_data = va_arg(ap, void *);
2022             break;
2023         case PWMD_OPTION_PASSWORD_FUNC:
2024             pwm->passfunc = va_arg(ap, pwmd_password_fn);
2025             break;
2026         case PWMD_OPTION_PASSWORD_DATA:
2027             pwm->passdata = va_arg(ap, void *);
2028             break;
2029         case PWMD_OPTION_PASSWORD:
2030             arg1 = va_arg(ap, char *);
2031
2032             if (pwm->password)
2033                 xfree(pwm->password);
2034
2035             pwm->password = xstrdup(arg1);
2036             break;
2037 #ifdef WITH_PINENTRY
2038         case PWMD_OPTION_PINENTRY:
2039             n = va_arg(ap, int);
2040
2041             if (n != 0 && n != 1) {
2042                 va_end(ap);
2043                 error = GPG_ERR_INV_VALUE;
2044             }
2045             else {
2046                 pwm->use_pinentry = n;
2047                 error = pwmd_command(pwm, &result, "OPTION PINENTRY=%i",
2048                         !pwm->use_pinentry);
2049             }
2050             break;
2051         case PWMD_OPTION_PINENTRY_TRIES:
2052             n = va_arg(ap, int);
2053
2054             if (n <= 0) {
2055                 va_end(ap);
2056                 error = GPG_ERR_INV_VALUE;
2057             }
2058             else
2059                 pwm->pinentry_tries = n;
2060             break;
2061         case PWMD_OPTION_PINENTRY_PATH:
2062             if (pwm->pinentry_path)
2063                 xfree(pwm->pinentry_path);
2064
2065             pwm->pinentry_path = xstrdup(va_arg(ap, char *));
2066             break;
2067         case PWMD_OPTION_PINENTRY_TTY:
2068             if (pwm->pinentry_tty)
2069                 xfree(pwm->pinentry_tty);
2070
2071             pwm->pinentry_tty = xstrdup(va_arg(ap, char *));
2072             break;
2073         case PWMD_OPTION_PINENTRY_DISPLAY:
2074             if (pwm->pinentry_display)
2075                 xfree(pwm->pinentry_display);
2076
2077             pwm->pinentry_display = xstrdup(va_arg(ap, char *));
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             break;
2085         case PWMD_OPTION_PINENTRY_TITLE:
2086             if (pwm->title)
2087                 xfree(pwm->title);
2088             pwm->title = percent_escape(va_arg(ap, char *));
2089             break;
2090         case PWMD_OPTION_PINENTRY_PROMPT:
2091             if (pwm->prompt)
2092                 xfree(pwm->prompt);
2093             pwm->prompt = percent_escape(va_arg(ap, char *));
2094             break;
2095         case PWMD_OPTION_PINENTRY_DESC:
2096             if (pwm->desc)
2097                 xfree(pwm->desc);
2098             pwm->desc = percent_escape(va_arg(ap, char *));
2099             break;
2100 #else
2101         case PWMD_OPTION_PINENTRY:
2102         case PWMD_OPTION_PINENTRY_TRIES:
2103         case PWMD_OPTION_PINENTRY_PATH:
2104         case PWMD_OPTION_PINENTRY_TTY:
2105         case PWMD_OPTION_PINENTRY_DISPLAY:
2106         case PWMD_OPTION_PINENTRY_TERM:
2107         case PWMD_OPTION_PINENTRY_TITLE:
2108         case PWMD_OPTION_PINENTRY_PROMPT:
2109         case PWMD_OPTION_PINENTRY_DESC:
2110             error = GPG_ERR_NOT_IMPLEMENTED;
2111             break;
2112 #endif
2113         default:
2114             error = GPG_ERR_NOT_IMPLEMENTED;
2115             break;
2116     }
2117
2118     va_end(ap);
2119     return error;
2120 }
2121
2122 /*
2123  * Prevent requiring assuan.h when setting ctx. The ctx is really an
2124  * assuan_context_t *.
2125  */
2126 gpg_error_t pwmd_assuan_ctx(pwm_t *pwm, void *ctx, int *fd)
2127 {
2128     if (!pwm)
2129         return GPG_ERR_INV_ARG;
2130
2131     ctx = pwm->ctx;
2132     *fd = pwm->fd;
2133     return 0;
2134 }