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 #endif
  56
  57 #ifdef HAVE_ASSUAN_H
  58 #include <assuan.h>
  59 #endif
  60
  61 #ifdef HAVE_SETLOCALE
  62 #include <locale.h>
  63 #endif
  64
  65 #include "gettext.h"
  66 #define N_(msgid)       dgettext("libpwmd", msgid)
  67
  68 #include "mem.h"
  69 #include "types.h"
  70
  71 static char *_getpwuid(struct passwd *pwd)
  72 {
  73     size_t size = sysconf(_SC_GETPW_R_SIZE_MAX);
  74     struct passwd *result;
  75     char *buf;
  76     int n;
  77
  78     if (size == -1)
  79         size = 16384;
  80
  81     buf = pwmd_malloc(size);
  82
  83     if (!buf)
  84         return NULL;
  85
  86     n = getpwuid_r(getuid(), pwd, buf, size, &result);
  87
  88     if (n) {
  89         pwmd_free(buf);
  90         errno = n;
  91         return NULL;
  92     }
  93
  94     if (!result) {
  95         pwmd_free(buf);
  96         return NULL;
  97     }
  98
  99     errno = n;
 100     return buf;
 101 }
 102
 103 static const char *_pwmd_strerror(gpg_error_t e)
 104 {
 105     gpg_err_code_t code = gpg_err_code(e);
 106
 107     if (code >= GPG_ERR_USER_1 && code < gpg_err_code(EPWMD_MAX)) {
 108         switch (code) {
 109             default:
 110                 return NULL;
 111             case GPG_ERR_USER_1:
 112                 return N_("Unknown error");
 113             case GPG_ERR_USER_2:
 114                 return N_("No cache slots available");
 115             case GPG_ERR_USER_3:
 116                 return N_("Recursion loop");
 117             case GPG_ERR_USER_4:
 118                 return N_("No file is open");
 119             case GPG_ERR_USER_5:
 120                 return N_("General LibXML error");
 121             case GPG_ERR_USER_6:
 122                 return N_("File modified");
 123         }
 124     }
 125
 126     return NULL;
 127 }
 128
 129 const char *pwmd_strerror(gpg_error_t code)
 130 {
 131     const char *p = _pwmd_strerror(code);
 132
 133     return p ? p : gpg_strerror(code);
 134 }
 135
 136 int pwmd_strerror_r(gpg_error_t code, char *buf, size_t size)
 137 {
 138     const char *p = _pwmd_strerror(code);
 139
 140     if (p) {
 141         snprintf(buf, size, "%s", p);
 142
 143         if (strlen(p) > size)
 144             return ERANGE;
 145
 146         return 0;
 147     }
 148
 149     return gpg_strerror_r(code, buf, size);
 150 }
 151
 152 gpg_error_t pwmd_init()
 153 {
 154     static int initialized;
 155
 156     if (initialized)
 157         return 0;
 158
 159 #ifndef MEM_DEBUG
 160     xmem_init();
 161 #endif
 162 #ifdef ENABLE_NLS
 163     bindtextdomain("libpwmd", LOCALEDIR);
 164 #endif
 165     gpg_err_init();
 166     assuan_set_malloc_hooks(pwmd_malloc, pwmd_realloc, pwmd_free);
 167     assuan_set_assuan_err_source(GPG_ERR_SOURCE_DEFAULT);
 168     initialized = 1;
 169     return 0;
 170 }
 171
 172 static gpg_error_t _socket_connect_finalize(pwm_t *pwm)
 173 {
 174     int active[2];
 175     int n = assuan_get_active_fds(pwm->ctx, 0, active, N_ARRAY(active));
 176     gpg_error_t rc;
 177     char *result;
 178
 179     if (n <= 0)
 180         return GPG_ERR_EBADFD;
 181
 182     pwm->fd = active[0];
 183 #ifdef WITH_PINENTRY
 184     pwm->pid = -1;
 185 #endif
 186     assuan_set_pointer(pwm->ctx, pwm);
 187
 188     if (pwm->name) {
 189         rc = pwmd_command(pwm, NULL, "OPTION CLIENT NAME=%s", pwm->name);
 190
 191         if (rc)
 192             return rc;
 193     }
 194
 195     rc = pwmd_command(pwm, &result, "VERSION");
 196
 197     if (rc && rc != GPG_ERR_ASS_UNKNOWN_CMD)
 198         return rc;
 199
 200     if (rc)
 201         pwm->version = PWMD_V1;
 202     else
 203         pwm->version = PWMD_V2;
 204
 205     pwmd_free(result);
 206     return 0;
 207 }
 208
 209 #ifdef WITH_TCP
 210 static int read_hook(assuan_context_t ctx, assuan_fd_t fd, void *data,
 211         size_t len, ssize_t *ret)
 212 {
 213     pwm_t *pwm = assuan_get_pointer(ctx);
 214     int n = 0;
 215
 216     if (!pwm || !pwm->tcp_conn)
 217 #ifdef WITH_LIBPTH
 218         *ret = pth_read((int)fd, data, len);
 219 #else
 220         *ret = read((int)fd, data, len);
 221 #endif
 222     else {
 223         do {
 224             *ret = libssh2_channel_read(pwm->tcp_conn->channel, data, len);
 225             n = libssh2_session_last_errno(pwm->tcp_conn->session);
 226         } while (n == LIBSSH2_ERROR_EAGAIN);
 227     }
 228
 229     return !n && *ret != -1 ? 1 : 0;
 230 }
 231
 232 static int write_hook(assuan_context_t ctx, assuan_fd_t fd, const void *data,
 233         size_t len, ssize_t *ret)
 234 {
 235     pwm_t *pwm = assuan_get_pointer(ctx);
 236     int n = 0;
 237
 238     if (!pwm || !pwm->tcp_conn)
 239 #ifdef WITH_LIBPTH
 240         *ret = pth_write((int)fd, data, len);
 241 #else
 242         *ret = write((int)fd, data, len);
 243 #endif
 244     else {
 245         do {
 246             *ret = libssh2_channel_write(pwm->tcp_conn->channel, data, len);
 247             n = libssh2_session_last_errno(pwm->tcp_conn->session);
 248         } while (n == LIBSSH2_ERROR_EAGAIN);
 249     }
 250
 251     return !n && *ret != -1 ? 1 : 0;
 252 }
 253
 254 static void _ssh_deinit(pwmd_tcp_conn_t *conn);
 255 static void free_tcp_conn(pwmd_tcp_conn_t *conn)
 256 {
 257     if (!conn)
 258         return;
 259
 260     if (conn->username) {
 261         pwmd_free(conn->username);
 262         conn->username = NULL;
 263     }
 264
 265     if (conn->known_hosts) {
 266         pwmd_free(conn->known_hosts);
 267         conn->known_hosts = NULL;
 268     }
 269
 270     if (conn->identity) {
 271         pwmd_free(conn->identity);
 272         conn->identity = NULL;
 273     }
 274
 275     if (conn->identity_pub) {
 276         pwmd_free(conn->identity_pub);
 277         conn->identity_pub = NULL;
 278     }
 279
 280     if (conn->host) {
 281         pwmd_free(conn->host);
 282         conn->host = NULL;
 283     }
 284
 285     if (conn->hostkey) {
 286         pwmd_free(conn->hostkey);
 287         conn->hostkey = NULL;
 288     }
 289
 290     if (conn->chan) {
 291         ares_destroy(conn->chan);
 292         conn->chan = NULL;
 293     }
 294
 295     if (conn->he) {
 296         ares_free_hostent(conn->he);
 297         conn->he = NULL;
 298     }
 299
 300     if (conn->fd >= 0) {
 301         close(conn->fd);
 302         conn->fd = -1;
 303     }
 304
 305     if (conn->session)
 306         _ssh_deinit(conn);
 307     else
 308         pwmd_free(conn);
 309 }
 310
 311 static void _ssh_deinit(pwmd_tcp_conn_t *conn)
 312 {
 313     if (!conn)
 314         return;
 315
 316     if (conn->channel)
 317         libssh2_channel_free(conn->channel);
 318
 319     if (conn->session) {
 320         libssh2_session_disconnect(conn->session, "Bye!");
 321         libssh2_session_free(conn->session);
 322     }
 323
 324     conn->session = NULL;
 325     conn->channel = NULL;
 326     free_tcp_conn(conn);
 327 }
 328
 329 static void _ssh_assuan_deinit(assuan_context_t ctx)
 330 {
 331     pwm_t *pwm = assuan_get_pointer(ctx);
 332
 333     pwm->tcp_conn->fd = -1;
 334     _ssh_deinit(pwm->tcp_conn);
 335     pwm->tcp_conn = NULL;
 336 }
 337
 338 /*
 339  * Sets common options from both pwmd_ssh_connect() and
 340  * pwmd_ssh_connect_async().
 341  */
 342 static gpg_error_t init_tcp_conn(pwmd_tcp_conn_t **dst, const char *host,
 343         int port, const char *identity, const char *user, const char *hosts,
 344         int get)
 345 {
 346     pwmd_tcp_conn_t *conn;
 347     gpg_error_t rc = 0;
 348
 349     if (get) {
 350         if (!host)
 351             return GPG_ERR_INV_ARG;
 352     }
 353     else {
 354         if (!host || !identity || !hosts)
 355             return GPG_ERR_INV_ARG;
 356     }
 357
 358     conn = pwmd_calloc(1, sizeof(pwmd_tcp_conn_t));
 359
 360     if (!conn)
 361         return gpg_error_from_errno(ENOMEM);
 362
 363     conn->port = port == -1 ? 22 : port;
 364     conn->host = pwmd_strdup(host);
 365
 366     if (!conn->host) {
 367         rc = gpg_error_from_errno(ENOMEM);
 368         goto fail;
 369     }
 370
 371     if (!get) {
 372         struct passwd pw;
 373         char *pwbuf = _getpwuid(&pw);
 374
 375         if (!pwbuf) {
 376             rc = gpg_error_from_errno(errno);
 377             goto fail;
 378         }
 379
 380         conn->username = pwmd_strdup(user ? user : pw.pw_name);
 381         pwmd_free(pwbuf);
 382
 383         if (!conn->username) {
 384             rc = gpg_error_from_errno(ENOMEM);
 385             goto fail;
 386         }
 387
 388         conn->identity = pwmd_strdup(identity);
 389
 390         if (!conn->identity) {
 391             rc = gpg_error_from_errno(ENOMEM);
 392             goto fail;
 393         }
 394
 395         conn->identity_pub = pwmd_malloc(strlen(conn->identity)+5);
 396
 397         if (!conn->identity_pub) {
 398             rc = gpg_error_from_errno(ENOMEM);
 399             goto fail;
 400         }
 401
 402         sprintf(conn->identity_pub, "%s.pub", conn->identity);
 403         conn->known_hosts = pwmd_strdup(hosts);
 404
 405         if (!conn->known_hosts) {
 406             rc = gpg_error_from_errno(ENOMEM);
 407             goto fail;
 408         }
 409     }
 410
 411     *dst = conn;
 412     return 0;
 413
 414 fail:
 415     free_tcp_conn(conn);
 416     return rc;
 417 }
 418
 419 static gpg_error_t do_connect(pwm_t *pwm, int prot, void *addr)
 420 {
 421     struct sockaddr_in their_addr;
 422
 423     pwm->tcp_conn->fd = socket(prot, SOCK_STREAM, 0);
 424
 425     if (pwm->tcp_conn->fd == -1)
 426         return gpg_error_from_syserror();
 427
 428     if (pwm->tcp_conn->async)
 429         fcntl(pwm->tcp_conn->fd, F_SETFL, O_NONBLOCK);
 430
 431     pwm->cmd = ASYNC_CMD_CONNECT;
 432     their_addr.sin_family = prot;
 433     their_addr.sin_port = htons(pwm->tcp_conn->port);
 434     their_addr.sin_addr = *((struct in_addr *)addr);
 435     memset(their_addr.sin_zero, '\0', sizeof their_addr.sin_zero);
 436
 437 #ifdef WITH_LIBPTH
 438     if (pth_connect(pwm->tcp_conn->fd, (struct sockaddr *)&their_addr,
 439                 sizeof(their_addr)) == -1)
 440 #else
 441     if (connect(pwm->tcp_conn->fd, (struct sockaddr *)&their_addr,
 442                 sizeof(their_addr)) == -1)
 443 #endif
 444         return gpg_error_from_syserror();
 445
 446     return 0;
 447 }
 448
 449 static gpg_error_t ares_error_to_pwmd(int status)
 450 {
 451     if (status != ARES_SUCCESS)
 452         warnx("%s", ares_strerror(status));
 453
 454     switch (status) {
 455         case ARES_ENODATA:
 456         case ARES_EFORMERR:
 457         case ARES_ENOTFOUND:
 458             return GPG_ERR_UNKNOWN_HOST;
 459         case ARES_ESERVFAIL:
 460              return GPG_ERR_EHOSTDOWN;
 461         case ARES_ETIMEOUT:
 462             return GPG_ERR_TIMEOUT;
 463         case ARES_ENOMEM:
 464             return gpg_error_from_errno(ENOMEM);
 465         case ARES_ECONNREFUSED:
 466             return GPG_ERR_ECONNREFUSED;
 467         default:
 468             /* FIXME ??? */
 469             return GPG_ERR_EHOSTUNREACH;
 470     }
 471
 472     return ARES_SUCCESS;
 473 }
 474
 475 static void dns_resolve_cb(void *arg, int status, int timeouts,
 476         unsigned char *abuf, int alen)
 477 {
 478     pwm_t *pwm = arg;
 479     int rc;
 480     struct hostent *he;
 481
 482     if (status == ARES_EDESTRUCTION)
 483         return;
 484
 485     if (status != ARES_SUCCESS) {
 486         pwm->tcp_conn->rc = ares_error_to_pwmd(status);
 487         return;
 488     }
 489
 490     /* Check for an IPv6 address first. */
 491     if (pwm->prot == PWMD_IP_ANY || pwm->prot == PWMD_IPV6)
 492         rc = ares_parse_aaaa_reply(abuf, alen, &he, NULL, NULL);
 493     else
 494         rc = ares_parse_a_reply(abuf, alen, &he, NULL, NULL);
 495
 496     if (rc != ARES_SUCCESS) {
 497         if (pwm->prot != PWMD_IP_ANY || rc != ARES_ENODATA) {
 498             pwm->tcp_conn->rc = ares_error_to_pwmd(status);
 499             return;
 500         }
 501
 502         rc = ares_parse_a_reply(abuf, alen, &he, NULL, NULL);
 503
 504         if (rc != ARES_SUCCESS) {
 505             pwm->tcp_conn->rc = ares_error_to_pwmd(status);
 506             return;
 507         }
 508     }
 509
 510     pwm->tcp_conn->he = he;
 511     pwm->tcp_conn->rc = do_connect(pwm, he->h_addrtype, he->h_addr);
 512 }
 513
 514 static gpg_error_t _do_pwmd_tcp_connect_async(pwm_t *pwm, const char *host,
 515         int port, const char *identity, const char *user,
 516         const char *known_hosts, pwmd_async_cmd_t which)
 517 {
 518     pwmd_tcp_conn_t *conn;
 519     gpg_error_t rc;
 520
 521     if (!pwm)
 522         return GPG_ERR_INV_ARG;
 523
 524     rc = init_tcp_conn(&conn, host, port, identity, user, known_hosts,
 525             which == ASYNC_CMD_HOSTKEY ? 1 : 0);
 526
 527     if (rc)
 528         return rc;
 529
 530     conn->async = 1;
 531     pwm->tcp_conn = conn;
 532     pwm->tcp_conn->cmd = which;
 533
 534     if (pwm->tcp_conn->cmd == ASYNC_CMD_HOSTKEY)
 535         pwm->tcp_conn->get_only = 1;
 536
 537     pwm->cmd = ASYNC_CMD_DNS;
 538     pwm->state = ASYNC_PROCESS;
 539     ares_init(&pwm->tcp_conn->chan);
 540     ares_query(pwm->tcp_conn->chan, pwm->tcp_conn->host, ns_c_any, ns_t_any,
 541             dns_resolve_cb, pwm);
 542     return 0;
 543 }
 544
 545 gpg_error_t pwmd_ssh_connect_async(pwm_t *pwm, const char *host, int port,
 546         const char *identity, const char *user, const char *known_hosts)
 547 {
 548     return _do_pwmd_tcp_connect_async(pwm, host, port, identity, user,
 549             known_hosts, ASYNC_CMD_CONNECT);
 550 }
 551
 552 static void *_ssh_malloc(size_t size, void **data)
 553 {
 554     return pwmd_malloc(size);
 555 }
 556
 557 static void _ssh_free(void *ptr, void **data)
 558 {
 559     pwmd_free(ptr);
 560 }
 561
 562 static void *_ssh_realloc(void *ptr, size_t size, void **data)
 563 {
 564     return pwmd_realloc(ptr, size);
 565 }
 566
 567 static char *to_hex(const char *str, size_t slen)
 568 {
 569     int i;
 570     char *buf = pwmd_malloc(slen*2+1);
 571
 572     if (!buf)
 573         return NULL;
 574
 575     for (i = 0, buf[0] = 0; i < slen; i++) {
 576         char tmp[3];
 577
 578         sprintf(tmp, "%02x", (unsigned char)str[i]);
 579         strcat(buf, tmp);
 580     }
 581
 582     return buf;
 583 }
 584
 585 static int verify_host_key(pwm_t *pwm)
 586 {
 587     FILE *fp = fopen(pwm->tcp_conn->known_hosts, "r");
 588     char *buf, *p;
 589
 590     if (!fp)
 591         return 1;
 592
 593     buf = pwmd_malloc(LINE_MAX);
 594
 595     if (!buf)
 596         goto fail;
 597
 598     while ((p = fgets(buf, LINE_MAX, fp))) {
 599         if (*p == '#' || isspace(*p))
 600             continue;
 601
 602         if (p[strlen(p)-1] == '\n')
 603             p[strlen(p)-1] = 0;
 604
 605         if (!strcmp(buf, pwm->tcp_conn->hostkey))
 606             goto done;
 607     }
 608
 609 fail:
 610     if (buf)
 611         pwmd_free(buf);
 612
 613     fclose(fp);
 614     return 1;
 615
 616 done:
 617     pwmd_free(buf);
 618     fclose(fp);
 619     return 0;
 620 }
 621
 622 static gpg_error_t authenticate_ssh(pwm_t *pwm)
 623 {
 624     const char *fp = libssh2_hostkey_hash(pwm->tcp_conn->session,
 625             LIBSSH2_HOSTKEY_HASH_SHA1);
 626     char *userauth;
 627
 628     pwm->tcp_conn->hostkey = to_hex(fp, 20);
 629
 630     if (!pwm->tcp_conn->hostkey)
 631         return gpg_error_from_errno(ENOMEM);
 632
 633     if (pwm->tcp_conn->get_only)
 634         return 0;
 635
 636     if (!fp || verify_host_key(pwm))
 637         return GPG_ERR_CHECKSUM;
 638
 639     userauth = libssh2_userauth_list(pwm->tcp_conn->session,
 640             pwm->tcp_conn->username, strlen(pwm->tcp_conn->username));
 641
 642     if (!userauth || !strstr(userauth, "publickey"))
 643         return GPG_ERR_BAD_PIN_METHOD;
 644
 645     if (libssh2_userauth_publickey_fromfile(pwm->tcp_conn->session,
 646                 pwm->tcp_conn->username, pwm->tcp_conn->identity_pub,
 647                 pwm->tcp_conn->identity, NULL))
 648         return GPG_ERR_BAD_SECKEY;
 649
 650     return 0;
 651 }
 652
 653 static gpg_error_t setup_tcp_session(pwm_t *pwm)
 654 {
 655     assuan_context_t ctx;
 656     struct assuan_io_hooks io_hooks = {read_hook, write_hook};
 657     gpg_error_t rc;
 658
 659     pwm->tcp_conn->session = libssh2_session_init_ex(_ssh_malloc, _ssh_free,
 660             _ssh_realloc, NULL);
 661
 662     if (!pwm->tcp_conn->session) {
 663         rc = gpg_error_from_errno(ENOMEM);
 664         goto fail;
 665     }
 666
 667     if (libssh2_session_startup(pwm->tcp_conn->session, pwm->tcp_conn->fd)) {
 668         rc = GPG_ERR_ASSUAN_SERVER_FAULT;
 669         goto fail;
 670     }
 671
 672     rc = authenticate_ssh(pwm);
 673
 674     if (rc)
 675         goto fail;
 676
 677     /* pwmd_get_hostkey(). */
 678     if (pwm->tcp_conn->get_only) {
 679         pwm->result = pwmd_strdup(pwm->tcp_conn->hostkey);
 680
 681         if (!pwm->result) {
 682             rc = gpg_error_from_errno(ENOMEM);
 683             goto fail;
 684         }
 685
 686         return 0;
 687     }
 688
 689     pwm->tcp_conn->channel = libssh2_channel_open_session(pwm->tcp_conn->session);
 690
 691     if (!pwm->tcp_conn->channel) {
 692         rc = GPG_ERR_ASSUAN_SERVER_FAULT;
 693         goto fail;
 694     }
 695
 696     if (libssh2_channel_shell(pwm->tcp_conn->channel)) {
 697         rc = GPG_ERR_ASSUAN_SERVER_FAULT;
 698         goto fail;
 699     }
 700
 701     assuan_set_io_hooks(&io_hooks);
 702     rc = assuan_socket_connect_fd(&ctx, pwm->tcp_conn->fd, 0, pwm);
 703
 704     if (rc)
 705         goto fail;
 706
 707     assuan_set_finish_handler(ctx, _ssh_assuan_deinit);
 708     pwm->ctx = ctx;
 709     return _socket_connect_finalize(pwm);
 710
 711 fail:
 712     free_tcp_conn(pwm->tcp_conn);
 713     pwm->tcp_conn = NULL;
 714     return rc;
 715 }
 716
 717 static gpg_error_t _do_pwmd_tcp_connect(pwm_t *pwm, const char *host, int port,
 718         const char *identity, const char *user, const char *known_hosts, int get)
 719 {
 720     pwmd_tcp_conn_t *conn;
 721     gpg_error_t rc;
 722
 723     if (!pwm)
 724         return GPG_ERR_INV_ARG;
 725
 726     rc = init_tcp_conn(&conn, host, port, identity, user, known_hosts, get);
 727
 728     if (rc)
 729         return rc;
 730
 731     pwm->tcp_conn = conn;
 732     pwm->tcp_conn->get_only = get;
 733     pwm->cmd = ASYNC_CMD_DNS;
 734     ares_init(&pwm->tcp_conn->chan);
 735     ares_query(pwm->tcp_conn->chan, pwm->tcp_conn->host, ns_c_any, ns_t_any,
 736             dns_resolve_cb, pwm);
 737
 738     /* dns_resolve_cb() may have already been called. */
 739     if (pwm->tcp_conn->rc) {
 740         rc = pwm->tcp_conn->rc;
 741         goto fail;
 742     }
 743
 744     /*
 745      * Fake a blocking DNS lookup. libcares does a better job than
 746      * getaddrinfo().
 747      */
 748     do {
 749         fd_set rfds, wfds;
 750         int n;
 751         struct timeval tv;
 752
 753         FD_ZERO(&rfds);
 754         FD_ZERO(&wfds);
 755         n = ares_fds(pwm->tcp_conn->chan, &rfds, &wfds);
 756         ares_timeout(pwm->tcp_conn->chan, NULL, &tv);
 757 #ifdef WITH_LIBPTH
 758         n = pth_select(n, &rfds, &wfds, NULL, &tv);
 759 #else
 760         n = select(n, &rfds, &wfds, NULL, &tv);
 761 #endif
 762
 763         if (n == -1) {
 764             rc = gpg_error_from_syserror();
 765             goto fail;
 766         }
 767         else if (n == 0) {
 768             rc = GPG_ERR_TIMEOUT;
 769             goto fail;
 770         }
 771
 772         ares_process(pwm->tcp_conn->chan, &rfds, &wfds);
 773
 774         if (pwm->tcp_conn->rc)
 775             break;
 776     } while (pwm->cmd == ASYNC_CMD_DNS);
 777
 778     if (pwm->tcp_conn->rc) {
 779         rc = pwm->tcp_conn->rc;
 780         goto fail;
 781     }
 782
 783     return setup_tcp_session(pwm);
 784
 785 fail:
 786     return rc;
 787 }
 788
 789 gpg_error_t pwmd_ssh_connect(pwm_t *pwm, const char *host, int port,
 790         const char *identity, const char *user, const char *known_hosts)
 791 {
 792     return _do_pwmd_tcp_connect(pwm, host, port, identity, user, known_hosts, 0);
 793 }
 794
 795 gpg_error_t pwmd_get_hostkey(pwm_t *pwm, const char *host, int port,
 796         char **result)
 797 {
 798     char *hostkey;
 799     gpg_error_t rc;
 800
 801     rc = _do_pwmd_tcp_connect(pwm, host, port, NULL, NULL, NULL, 1);
 802
 803     if (rc)
 804         return rc;
 805
 806     hostkey = pwmd_strdup(pwm->tcp_conn->hostkey);
 807
 808     if (!hostkey)
 809         rc = gpg_error_from_errno(ENOMEM);
 810
 811     *result = hostkey;
 812     return rc;
 813 }
 814
 815 gpg_error_t pwmd_get_hostkey_async(pwm_t *pwm, const char *host, int port)
 816 {
 817     return _do_pwmd_tcp_connect_async(pwm, host, port, NULL, NULL, NULL,
 818             ASYNC_CMD_HOSTKEY);
 819 }
 820 #endif
 821
 822 gpg_error_t pwmd_connect(pwm_t *pwm, const char *path)
 823 {
 824     char *socketpath = NULL;
 825     assuan_context_t ctx;
 826     struct passwd pw;
 827     char *pwbuf;
 828     gpg_error_t rc;
 829
 830     if (!pwm)
 831         return GPG_ERR_INV_ARG;
 832
 833     pwbuf = _getpwuid(&pw);
 834
 835     if (!pwbuf)
 836         return gpg_error_from_errno(errno);
 837
 838     if (!path) {
 839         socketpath = (char *)pwmd_malloc(strlen(pw.pw_dir) + strlen("/.pwmd/socket") + 1);
 840         sprintf(socketpath, "%s/.pwmd/socket", pw.pw_dir);
 841     }
 842     else
 843         socketpath = pwmd_strdup(path);
 844
 845     pwmd_free(pwbuf);
 846     rc = assuan_socket_connect_ext(&ctx, socketpath, -1, 0);
 847     pwmd_free(socketpath);
 848
 849     if (rc)
 850         return rc;
 851
 852     pwm->ctx = ctx;
 853     return _socket_connect_finalize(pwm);
 854 }
 855
 856 void pwmd_close(pwm_t *pwm)
 857 {
 858     if (!pwm)
 859         return;
 860
 861     if (pwm->ctx)
 862         assuan_disconnect(pwm->ctx);
 863
 864     if (pwm->password)
 865         pwmd_free(pwm->password);
 866
 867     if (pwm->title)
 868         pwmd_free(pwm->title);
 869
 870     if (pwm->desc)
 871         pwmd_free(pwm->desc);
 872
 873     if (pwm->prompt)
 874         pwmd_free(pwm->prompt);
 875
 876     if (pwm->pinentry_tty)
 877         pwmd_free(pwm->pinentry_tty);
 878
 879     if (pwm->pinentry_display)
 880         pwmd_free(pwm->pinentry_display);
 881
 882     if (pwm->pinentry_term)
 883         pwmd_free(pwm->pinentry_term);
 884
 885     if (pwm->lcctype)
 886         pwmd_free(pwm->lcctype);
 887
 888     if (pwm->lcmessages)
 889         pwmd_free(pwm->lcmessages);
 890
 891     if (pwm->filename)
 892         pwmd_free(pwm->filename);
 893
 894     if (pwm->name)
 895         pwmd_free(pwm->name);
 896
 897 #ifdef WITH_TCP
 898     if (pwm->tcp_conn)
 899         free_tcp_conn(pwm->tcp_conn);
 900 #endif
 901
 902     pwmd_free(pwm);
 903 }
 904
 905 static int mem_realloc_cb(void *data, const void *buffer, size_t len)
 906 {
 907     membuf_t *mem = (membuf_t *)data;
 908     void *p;
 909
 910     if (!buffer)
 911         return 0;
 912
 913     if ((p = pwmd_realloc(mem->buf, mem->len + len)) == NULL)
 914         return 1;
 915
 916     mem->buf = p;
 917     memcpy((char *)mem->buf + mem->len, buffer, len);
 918     mem->len += len;
 919     return 0;
 920 }
 921
 922 static int _inquire_cb(void *data, const char *keyword)
 923 {
 924     pwm_t *pwm = (pwm_t *)data;
 925     gpg_error_t rc = 0;
 926     int flags = fcntl(pwm->fd, F_GETFL);
 927
 928     /* Shouldn't get this far without a callback. */
 929     if (!pwm->inquire_func)
 930         return GPG_ERR_INV_ARG;
 931
 932     /*
 933      * Since the socket file descriptor is probably set to non-blocking, set to
 934      * blocking to prevent GPG_ERR_EAGAIN errors. This should be fixed when
 935      * asynchronous INQUIRE is supported by either libassuan or a later
 936      * libpwmd.
 937      */
 938     fcntl(pwm->fd, F_SETFL, 0);
 939
 940     for (;;) {
 941         char *result = NULL;
 942         size_t len;
 943         gpg_error_t arc;
 944
 945         rc = pwm->inquire_func(pwm->inquire_data, keyword, rc, &result, &len);
 946         rc = gpg_err_code(rc);
 947
 948         if (rc == GPG_ERR_EOF || !rc) {
 949             if (len <= 0 || !result) {
 950                 rc = 0;
 951                 break;
 952             }
 953
 954             arc = assuan_send_data(pwm->ctx, result, len);
 955
 956             if (rc == GPG_ERR_EOF) {
 957                 rc = arc;
 958                 break;
 959             }
 960
 961             rc = arc;
 962         }
 963         else if (rc)
 964             break;
 965     }
 966
 967     fcntl(pwm->fd, F_SETFL, flags);
 968     return rc;
 969 }
 970
 971 static gpg_error_t do_nb_command(pwm_t *pwm, const char *cmd, ...)
 972 {
 973     char *buf;
 974     gpg_error_t rc;
 975     va_list ap;
 976
 977     if (pwm->state == ASYNC_DONE)
 978         pwm->state = ASYNC_INIT;
 979
 980     if (pwm->state != ASYNC_INIT)
 981         return GPG_ERR_INV_STATE;
 982
 983     buf = pwmd_malloc(ASSUAN_LINELENGTH+1);
 984
 985     if (!buf)
 986         return gpg_error_from_errno(ENOMEM);
 987
 988     va_start(ap, cmd);
 989     vsnprintf(buf, ASSUAN_LINELENGTH, cmd, ap);
 990     va_end(ap);
 991     rc = assuan_write_line(pwm->ctx, buf);
 992     pwmd_free(buf);
 993
 994     if (!rc)
 995         pwm->state = ASYNC_PROCESS;
 996
 997     return rc;
 998 }
 999
1000 gpg_error_t pwmd_open_async(pwm_t *pwm, const char *filename)
1001 {
1002     if (!pwm || !filename)
1003         return GPG_ERR_INV_ARG;
1004
1005     if (!pwm->ctx)
1006         return GPG_ERR_INV_STATE;
1007
1008     if (pwm->cmd != ASYNC_CMD_OPEN) {
1009         gpg_error_t rc;
1010
1011         pwm->pin_try = 0;
1012
1013         if (pwm->filename)
1014             pwmd_free(pwm->filename);
1015
1016         pwm->filename = pwmd_strdup(filename);
1017
1018         rc = send_pinentry_options(pwm);
1019
1020         if (rc)
1021             return rc;
1022     }
1023
1024     pwm->cmd = ASYNC_CMD_OPEN;
1025     return do_nb_command(pwm, "OPEN %s %s", filename,
1026             pwm->password ? pwm->password : "");
1027 }
1028
1029 gpg_error_t pwmd_save_async(pwm_t *pwm)
1030 {
1031     gpg_error_t rc;
1032
1033     if (!pwm)
1034         return GPG_ERR_INV_ARG;
1035
1036     if (!pwm->ctx)
1037         return GPG_ERR_INV_STATE;
1038
1039     rc = send_pinentry_options(pwm);
1040
1041     if (rc)
1042         return rc;
1043
1044     pwm->cmd = ASYNC_CMD_SAVE;
1045     return do_nb_command(pwm, "SAVE %s", pwm->password ? pwm->password : "");
1046 }
1047
1048 static gpg_error_t parse_assuan_line(pwm_t *pwm)
1049 {
1050     gpg_error_t rc;
1051     char *line;
1052     size_t len;
1053
1054     rc = assuan_read_line(pwm->ctx, &line, &len);
1055
1056     if (!rc) {
1057         if (line[0] == 'O' && line[1] == 'K' &&
1058                 (line[2] == 0 || line[2] == ' ')) {
1059             pwm->state = ASYNC_DONE;
1060         }
1061         else if (line[0] == '#') {
1062         }
1063         else if (line[0] == 'S' && (line[1] == 0 || line[1] == ' ')) {
1064             if (pwm->status_func) {
1065                 pwm->status_func(pwm->status_data,
1066                         line[1] == 0 ? line+1 : line+2);
1067             }
1068         }
1069         else if (line[0] == 'E' && line[1] == 'R' && line[2] == 'R' &&
1070                 (line[3] == 0 || line[3] == ' ')) {
1071             line += 4;
1072             rc = atoi(line);
1073             pwm->state = ASYNC_DONE;
1074         }
1075     }
1076
1077     return rc;
1078 }
1079
1080 gpg_error_t pwmd_pending_line(pwm_t *pwm)
1081 {
1082     if (!pwm)
1083         return GPG_ERR_INV_ARG;
1084
1085     if (!pwm->ctx)
1086         return GPG_ERR_INV_STATE;
1087
1088     return assuan_pending_line(pwm->ctx) ? 0 : GPG_ERR_NO_DATA;
1089 }
1090
1091 static pwmd_async_t reset_async(pwm_t *pwm, int done)
1092 {
1093     pwm->state = ASYNC_INIT;
1094     pwm->cmd = ASYNC_CMD_NONE;
1095
1096 #ifdef WITH_PINENTRY
1097     if (pwm->nb_fd != -1) {
1098         close(pwm->nb_fd);
1099         pwm->nb_fd = -1;
1100     }
1101 #endif
1102 #ifdef WITH_TCP
1103     if (done && pwm->tcp_conn && pwm->tcp_conn->fd != -1) {
1104         close(pwm->tcp_conn->fd);
1105         pwm->tcp_conn->fd = -1;
1106     }
1107 #endif
1108
1109     return ASYNC_DONE;
1110 };
1111
1112 pwmd_async_t pwmd_process(pwm_t *pwm, gpg_error_t *rc, char **result)
1113 {
1114     fd_set fds;
1115     int n;
1116     struct timeval tv = {0, 0};
1117
1118     if (result)
1119         *result = NULL;
1120
1121     if (!rc)
1122         return GPG_ERR_INV_ARG;
1123
1124     *rc = 0;
1125
1126     if (!pwm) {
1127         *rc = GPG_ERR_INV_ARG;
1128         return ASYNC_DONE;
1129     }
1130     else if (!pwm->ctx) {
1131         switch (pwm->cmd) {
1132             default:
1133                 *rc = GPG_ERR_INV_STATE;
1134                 return ASYNC_DONE;
1135 #ifdef WITH_TCP
1136             case ASYNC_CMD_DNS:
1137             case ASYNC_CMD_CONNECT:
1138             case ASYNC_CMD_HOSTKEY:
1139                 break;
1140 #endif
1141         }
1142     }
1143
1144     /* When not in a command, this will let libassuan process status messages
1145      * by calling PWMD_OPTION_STATUS_FUNC. The client can poll the file
1146      * descriptor returned by pwmd_get_fd() to determine when this should be
1147      * called or call pwmd_pending_line() to determine whether a buffered line
1148      * needs to be processed. */
1149     if (pwm->cmd == ASYNC_CMD_NONE) {
1150         *rc = assuan_command(pwm, pwm->ctx, NULL, "NOP");
1151         return ASYNC_DONE;
1152     }
1153
1154     /* Fixes pwmd_open/save_async2() when there is a cached or new file. */
1155     if (pwm->state == ASYNC_DONE) {
1156         reset_async(pwm, 0);
1157         return ASYNC_DONE;
1158     }
1159
1160     if (pwm->state != ASYNC_PROCESS) {
1161         *rc = GPG_ERR_INV_STATE;
1162         return ASYNC_DONE;
1163     }
1164
1165 #ifdef WITH_TCP
1166     if (pwm->cmd == ASYNC_CMD_DNS) {
1167         fd_set rfds, wfds;
1168
1169         if (pwm->tcp_conn->rc) {
1170             *rc = pwm->tcp_conn->rc;
1171             reset_async(pwm, 1);
1172             return ASYNC_DONE;
1173         }
1174
1175         FD_ZERO(&rfds);
1176         FD_ZERO(&wfds);
1177         n = ares_fds(pwm->tcp_conn->chan, &rfds, &wfds);
1178
1179         /* Shouldn't happen. */
1180         if (!n)
1181             return pwm->state;
1182
1183 #ifdef WITH_LIBPTH
1184         n = pth_select(n, &rfds, &wfds, NULL, &tv);
1185 #else
1186         n = select(n, &rfds, &wfds, NULL, &tv);
1187 #endif
1188
1189         if (n > 0)
1190             ares_process(pwm->tcp_conn->chan, &rfds, &wfds);
1191
1192         return pwm->state;
1193     }
1194     else if (pwm->cmd == ASYNC_CMD_CONNECT) {
1195         if (pwm->tcp_conn->rc == GPG_ERR_EINPROGRESS) {
1196             int ret;
1197             socklen_t len = sizeof(int);
1198
1199             FD_ZERO(&fds);
1200             FD_SET(pwm->tcp_conn->fd, &fds);
1201 #ifdef WITH_LIBPTH
1202             n = pth_select(pwm->tcp_conn->fd+1, NULL, &fds, NULL, &tv);
1203 #else
1204             n = select(pwm->tcp_conn->fd+1, NULL, &fds, NULL, &tv);
1205 #endif
1206
1207             if (!n || !FD_ISSET(pwm->tcp_conn->fd, &fds))
1208                 return pwm->state;
1209             else if (n == -1) {
1210                 *rc = gpg_error_from_syserror();
1211                 reset_async(pwm, 1);
1212                 return ASYNC_DONE;
1213             }
1214
1215             ret = getsockopt(pwm->tcp_conn->fd, SOL_SOCKET, SO_ERROR, &n, &len);
1216
1217             if (ret || n) {
1218                 *rc = ret ? gpg_error_from_syserror() : gpg_error_from_errno(n);
1219                 reset_async(pwm, 1);
1220                 return ASYNC_DONE;
1221             }
1222         }
1223         else if (pwm->tcp_conn->rc) {
1224             *rc = pwm->tcp_conn->rc;
1225             reset_async(pwm, 1);
1226             return ASYNC_DONE;
1227         }
1228
1229         fcntl(pwm->tcp_conn->fd, F_SETFL, 0);
1230         *rc = setup_tcp_session(pwm);
1231
1232         if (!*rc) {
1233             switch (pwm->tcp_conn->cmd) {
1234                 case ASYNC_CMD_HOSTKEY:
1235                     if (!*rc)
1236                         *result = pwm->result;
1237                     break;
1238                 default:
1239                     break;
1240             }
1241         }
1242
1243         return reset_async(pwm, *rc ? 1 : 0);
1244     }
1245 #endif
1246
1247 #ifdef WITH_PINENTRY
1248     if (pwm->cmd == ASYNC_CMD_OPEN2 || pwm->cmd == ASYNC_CMD_SAVE2) {
1249         int status;
1250
1251         if (pwm->nb_fd == -1) {
1252             *rc = GPG_ERR_INV_STATE;
1253             return reset_async(pwm, 0);
1254         }
1255
1256         FD_ZERO(&fds);
1257         FD_SET(pwm->nb_fd, &fds);
1258         FD_SET(pwm->fd, &fds);
1259 #ifdef WITH_LIBPTH
1260         n = pth_select(pwm->nb_fd+1, &fds, NULL, NULL, &tv);
1261 #else
1262         n = select(pwm->nb_fd+1, &fds, NULL, NULL, &tv);
1263 #endif
1264         if (n == -1) {
1265             *rc = gpg_error_from_syserror();
1266             return reset_async(pwm, 0);
1267         }
1268
1269         if (n > 0 && FD_ISSET(pwm->nb_fd, &fds)) {
1270             pwmd_nb_status_t nb;
1271 #ifdef WITH_LIBPTH
1272             size_t len = pth_read(pwm->nb_fd, &nb, sizeof(nb));
1273 #else
1274             size_t len = read(pwm->nb_fd, &nb, sizeof(nb));
1275 #endif
1276             waitpid(pwm->nb_pid, &status, WNOHANG);
1277
1278             if (len != sizeof(nb)) {
1279                 *rc = gpg_error_from_syserror();
1280                 return reset_async(pwm, pwm->cmd == ASYNC_CMD_OPEN2 ? 1 : 0);
1281             }
1282
1283             *rc = nb.error;
1284
1285             if (*rc == GPG_ERR_INV_PASSPHRASE && pwm->cmd == ASYNC_CMD_SAVE2) {
1286                 reset_async(pwm, 0);
1287                 *rc = pwmd_save_async2(pwm);
1288                 return ASYNC_PROCESS;
1289             }
1290             else if (*rc)
1291                 return reset_async(pwm, pwm->cmd == ASYNC_CMD_OPEN2 ? 1 : 0);
1292
1293             if (pwm->cmd == ASYNC_CMD_SAVE2) {
1294                 *rc = do_save_command(pwm, nb.password);
1295                 memset(&nb, 0, sizeof(pwmd_nb_status_t));
1296                 return reset_async(pwm, 0);
1297             }
1298
1299             if (pwm->cmd == ASYNC_CMD_OPEN2) {
1300                 *rc = do_open_command(pwm, pwm->filename, nb.password);
1301                 memset(&nb, 0, sizeof(pwmd_nb_status_t));
1302
1303                 if (*rc == GPG_ERR_INV_PASSPHRASE) {
1304                     if (++pwm->pin_try < pwm->pinentry_tries) {
1305                         int n = pwm->pin_try;
1306
1307                         reset_async(pwm, 0);
1308                         pwm->pin_try = n;
1309                         pwm->cmd = ASYNC_CMD_OPEN2;
1310                         *rc = pwmd_open_async2(pwm, pwm->filename);
1311
1312                         if (*rc)
1313                             return reset_async(pwm, 1);
1314
1315                         return pwm->state;
1316                     }
1317                 }
1318
1319                 return reset_async(pwm, *rc ? 1 : 0);
1320             }
1321         }
1322
1323         /* Fall through so status messages can be processed during the
1324          * pinentry. */
1325     }
1326 #endif
1327
1328     if (pwm->fd < 0) {
1329         *rc = GPG_ERR_INV_STATE;
1330         return reset_async(pwm, 0);
1331     }
1332
1333     /* This is for the non-blocking OPEN and SAVE commands. */
1334     FD_ZERO(&fds);
1335     FD_SET(pwm->fd, &fds);
1336 #ifdef WITH_LIBPTH
1337     n = pth_select(pwm->fd+1, &fds, NULL, NULL, &tv);
1338 #else
1339     n = select(pwm->fd+1, &fds, NULL, NULL, &tv);
1340 #endif
1341
1342     if (n == -1) {
1343         *rc = gpg_error_from_syserror();
1344         return reset_async(pwm, 0);
1345     }
1346
1347     if (n > 0) {
1348         if (FD_ISSET(pwm->fd, &fds))
1349             *rc = parse_assuan_line(pwm);
1350     }
1351
1352     while (!*rc && assuan_pending_line(pwm->ctx))
1353         *rc = parse_assuan_line(pwm);
1354
1355     /* For pinentry retries. */
1356     if (pwm->cmd == ASYNC_CMD_OPEN &&
1357             gpg_err_code(*rc) == GPG_ERR_INV_PASSPHRASE &&
1358             ++pwm->pin_try < pwm->pinentry_tries) {
1359         pwm->state = ASYNC_INIT;
1360         *rc = pwmd_open_async(pwm, pwm->filename);
1361     }
1362
1363     if (*rc)
1364         return reset_async(pwm, pwm->cmd == ASYNC_CMD_OPEN ? 1 : 0);
1365
1366     if (pwm->state == ASYNC_DONE) {
1367         reset_async(pwm, 0);
1368         return ASYNC_DONE;
1369     }
1370
1371     return pwm->state;
1372 }
1373
1374 static gpg_error_t assuan_command(pwm_t *pwm, assuan_context_t ctx,
1375         char **result, const char *cmd)
1376 {
1377     membuf_t data;
1378     gpg_error_t rc;
1379
1380     data.len = 0;
1381     data.buf = NULL;
1382
1383     rc = assuan_transact(ctx, cmd, mem_realloc_cb, &data, _inquire_cb, pwm,
1384             pwm->status_func, pwm->status_data);
1385
1386     if (rc) {
1387         if (data.buf) {
1388             pwmd_free(data.buf);
1389             data.buf = NULL;
1390         }
1391     }
1392     else {
1393         if (data.buf) {
1394             mem_realloc_cb(&data, "", 1);
1395
1396             if (!result) {
1397                 pwmd_free(data.buf);
1398                 rc = GPG_ERR_INV_ARG;
1399             }
1400             else
1401                 *result = (char *)data.buf;
1402         }
1403     }
1404
1405     return gpg_err_code(rc);
1406 }
1407
1408 gpg_error_t pwmd_inquire(pwm_t *pwm, const char *cmd, pwmd_inquire_cb_t fn,
1409         void *data)
1410 {
1411     if (!pwm || !cmd || !fn)
1412         return GPG_ERR_INV_ARG;
1413
1414     if (!pwm->ctx)
1415         return GPG_ERR_INV_STATE;
1416
1417     pwm->inquire_func = fn;
1418     pwm->inquire_data = data;
1419     return assuan_command(pwm, pwm->ctx, NULL, cmd);
1420 }
1421
1422 #ifdef WITH_PINENTRY
1423 static gpg_error_t terminate_pinentry(pwm_t *pwm)
1424 {
1425     pid_t pid = pwm->pid;
1426
1427     pwm->pid = -1;
1428
1429     if (!pwm || pid == -1)
1430         return GPG_ERR_INV_ARG;
1431
1432     if (kill(pid, 0) == 0) {
1433         if (kill(pid, SIGTERM) == -1) {
1434             if (kill(pid, SIGKILL) == -1)
1435                 return gpg_error_from_errno(errno);
1436         }
1437     }
1438     else
1439         return gpg_error_from_errno(errno);
1440
1441     return 0;
1442 }
1443
1444 static gpg_error_t set_pinentry_strings(pwm_t *pwm, int which)
1445 {
1446     char *tmp, *desc;
1447     gpg_error_t error;
1448
1449     tmp = pwmd_malloc(ASSUAN_LINELENGTH+1);
1450
1451     if (!tmp)
1452         return gpg_error_from_errno(ENOMEM);
1453
1454     if (!pwm->title)
1455         pwm->title = pwmd_strdup(N_("Password Manager Daemon"));
1456
1457     if (!pwm->title)
1458         goto fail_no_mem;
1459
1460     if (!pwm->prompt)
1461         pwm->prompt = pwmd_strdup(N_("Passphrase:"));
1462
1463     if (!pwm->prompt)
1464         goto fail_no_mem;
1465
1466     if (!pwm->desc && (which == PINENTRY_OPEN || which == PINENTRY_SAVE)) {
1467         if (which == PINENTRY_OPEN)
1468             desc = pwmd_strdup_printf(N_("A passphrase is required to open the file \"%s\". Please%%0Aenter the passphrase below."), pwm->filename);
1469         else
1470             desc = pwmd_strdup_printf(N_("A passphrase is required to save to the file \"%s\". Please%%0Aenter the passphrase below."), pwm->filename);
1471
1472         if (!desc)
1473             goto fail_no_mem;
1474     }
1475
1476     if (pwm->desc)
1477         desc = pwm->desc;
1478
1479     switch (which) {
1480         case PINENTRY_OPEN:
1481         case PINENTRY_SAVE:
1482             snprintf(tmp, ASSUAN_LINELENGTH, "SETERROR %s", desc);
1483
1484             if (pwm->desc != desc)
1485                 pwmd_free(desc);
1486             break;
1487         case PINENTRY_OPEN_FAILED:
1488             snprintf(tmp, ASSUAN_LINELENGTH, "SETERROR %s",
1489                     N_("Invalid passphrase, please try again."));
1490             break;
1491         case PINENTRY_SAVE_CONFIRM:
1492             snprintf(tmp, ASSUAN_LINELENGTH, "SETERROR %s",
1493                     N_("Please type the passphrase again for confirmation."));
1494             break;
1495     }
1496
1497     error = pinentry_command(pwm, NULL, tmp);
1498
1499     if (error) {
1500         pwmd_free(tmp);
1501         return error;
1502     }
1503
1504     snprintf(tmp, ASSUAN_LINELENGTH, "SETPROMPT %s", pwm->prompt);
1505     error = pinentry_command(pwm, NULL, tmp);
1506
1507     if (error) {
1508         pwmd_free(tmp);
1509         return error;
1510     }
1511
1512     snprintf(tmp, ASSUAN_LINELENGTH, "SETDESC %s", pwm->title);
1513     error = pinentry_command(pwm, NULL, tmp);
1514     pwmd_free(tmp);
1515     return error;
1516
1517 fail_no_mem:
1518     pwmd_free(tmp);
1519     return gpg_error_from_errno(ENOMEM);
1520 }
1521
1522 static void update_pinentry_settings(pwm_t *pwm)
1523 {
1524     FILE *fp;
1525     char buf[LINE_MAX];
1526     char *p;
1527     struct passwd pw;
1528     char *pwbuf = _getpwuid(&pw);
1529
1530     if (!pwbuf)
1531         return;
1532
1533     snprintf(buf, sizeof(buf), "%s/.pwmd/pinentry.conf", pw.pw_dir);
1534     pwmd_free(pwbuf);
1535
1536     if ((fp = fopen(buf, "r")) == NULL)
1537         return;
1538
1539     while ((p = fgets(buf, sizeof(buf), fp)) != NULL) {
1540         char name[32], val[256];
1541
1542         if (sscanf(p, " %31[a-zA-Z] = %255s", name, val) != 2)
1543             continue;
1544
1545         if (strcasecmp(name, "TTYNAME") == 0) {
1546             pwmd_free(pwm->pinentry_tty);
1547             pwm->pinentry_tty = pwmd_strdup(val);
1548         }
1549         else if (strcasecmp(name, "TTYTYPE") == 0) {
1550             pwmd_free(pwm->pinentry_term);
1551             pwm->pinentry_term = pwmd_strdup(val);
1552         }
1553         else if (strcasecmp(name, "DISPLAY") == 0) {
1554             pwmd_free(pwm->pinentry_display);
1555             pwm->pinentry_display = pwmd_strdup(val);
1556         }
1557         else if (strcasecmp(name, "PATH") == 0) {
1558             pwmd_free(pwm->pinentry_path);
1559             pwm->pinentry_path = pwmd_strdup(val);
1560         }
1561     }
1562
1563     fclose(fp);
1564 }
1565
1566 static gpg_error_t launch_pinentry(pwm_t *pwm)
1567 {
1568     int rc;
1569     assuan_context_t ctx;
1570     int child_list[] = {-1};
1571     char *display = getenv("DISPLAY");
1572     const char *argv[10];
1573     const char **p = argv;
1574     int have_display = 0;
1575     char *tty = NULL;
1576     char *ttybuf = NULL;
1577
1578     update_pinentry_settings(pwm);
1579
1580     if (pwm->pinentry_display || display)
1581         have_display = 1;
1582     else {
1583         if (!pwm->pinentry_tty) {
1584             ttybuf = pwmd_malloc(255);
1585
1586             if (!ttybuf)
1587                 return gpg_error_from_errno(ENOMEM);
1588
1589             rc = ttyname_r(STDOUT_FILENO, ttybuf, 255);
1590
1591             if (rc) {
1592                 pwmd_free(ttybuf);
1593                 return gpg_error_from_errno(rc);
1594             }
1595
1596             tty = ttybuf;
1597         }
1598         else
1599             tty = pwm->pinentry_tty;
1600     }
1601
1602     if (!have_display && !tty)
1603         return GPG_ERR_ENOTTY;
1604
1605     *p++ = "pinentry";
1606     *p++ = have_display ? "--display" : "--ttyname";
1607     *p++ = have_display ? pwm->pinentry_display ? pwm->pinentry_display : display : tty;
1608
1609     if (pwm->lcctype) {
1610         *p++ = "--lc-ctype";
1611         *p++ = pwm->lcctype;
1612     }
1613
1614     if (pwm->lcmessages) {
1615         *p++ = "--lc-messages";
1616         *p++ = pwm->lcmessages;
1617     }
1618
1619     *p = NULL;
1620
1621     if (!have_display) {
1622         *p++ = "--ttytype";
1623         *p++ = pwm->pinentry_term ? pwm->pinentry_term : getenv("TERM");
1624         *p = NULL;
1625     }
1626
1627     rc = assuan_pipe_connect(&ctx, pwm->pinentry_path ? pwm->pinentry_path : PINENTRY_PATH, argv, child_list);
1628
1629     if (ttybuf)
1630         pwmd_free(ttybuf);
1631
1632     if (rc)
1633         return rc;
1634
1635     pwm->pid = assuan_get_pid(ctx);
1636     pwm->pctx = ctx;
1637     return set_pinentry_strings(pwm, 0);
1638 }
1639
1640 static gpg_error_t pinentry_command(pwm_t *pwm, char **result, const char *cmd)
1641 {
1642     gpg_error_t n;
1643
1644     if (!pwm->pctx) {
1645         n = launch_pinentry(pwm);
1646
1647         if (n)
1648             return n;
1649     }
1650
1651     return assuan_command(pwm, pwm->pctx, result, cmd);
1652 }
1653
1654 static void pinentry_disconnect(pwm_t *pwm)
1655 {
1656     if (pwm->pctx)
1657         assuan_disconnect(pwm->pctx);
1658
1659     pwm->pctx = NULL;
1660     pwm->pid = -1;
1661 }
1662
1663 /*
1664  * Only called from a child process.
1665  */
1666 static void catchsig(int sig)
1667 {
1668     switch (sig) {
1669         case SIGALRM:
1670             if (gelapsed++ >= gtimeout) {
1671                 terminate_pinentry(gpwm);
1672                 gerror = GPG_ERR_TIMEOUT;
1673             }
1674             else
1675                 alarm(1);
1676             break;
1677         default:
1678             break;
1679     }
1680 }
1681 #endif
1682
1683 /*
1684  * Borrowed from libassuan.
1685  */
1686 static char *percent_escape(const char *atext)
1687 {
1688     const unsigned char *s;
1689     int len = strlen(atext) * 3 + 1;
1690     char *buf = (char *)pwmd_malloc(len), *p = buf;
1691
1692     if (!buf)
1693         return NULL;
1694
1695     for (s=(const unsigned char *)atext; *s; s++) {
1696         if (*s < ' ') {
1697             sprintf (p, "%%%02X", *s);
1698             p += 3;
1699         }
1700         else
1701             *p++ = *s;
1702     }
1703
1704     *p = 0;
1705     return buf;
1706 }
1707
1708 static gpg_error_t send_command(pwm_t *pwm, char **result, const char *cmd)
1709 {
1710     if (!cmd)
1711         return GPG_ERR_INV_ARG;
1712
1713     return assuan_command(pwm, pwm->ctx, result, cmd);
1714 }
1715
1716 gpg_error_t pwmd_command_ap(pwm_t *pwm, char **result, const char *cmd,
1717         va_list ap)
1718 {
1719     char *buf;
1720     size_t len;
1721     gpg_error_t error;
1722
1723     if (!pwm || !cmd)
1724         return GPG_ERR_INV_ARG;
1725
1726     if (!pwm->ctx)
1727         return GPG_ERR_INV_STATE;
1728
1729     /*
1730      * C99 allows the dst pointer to be null which will calculate the length
1731      * of the would-be result and return it.
1732      */
1733     len = vsnprintf(NULL, 0, cmd, ap)+1;
1734     buf = (char *)pwmd_malloc(len);
1735
1736     if (!buf)
1737         return gpg_error_from_errno(ENOMEM);
1738
1739     len = vsnprintf(buf, len, cmd, ap);
1740
1741     if (buf[strlen(buf)-1] == '\n')
1742         buf[strlen(buf)-1] = 0;
1743
1744     if (buf[strlen(buf)-1] == '\r')
1745         buf[strlen(buf)-1] = 0;
1746
1747     error = send_command(pwm, result, buf);
1748     pwmd_free(buf);
1749     return error;
1750 }
1751
1752 gpg_error_t pwmd_command(pwm_t *pwm, char **result, const char *cmd, ...)
1753 {
1754     va_list ap;
1755     gpg_error_t error;
1756
1757     if (!pwm || !cmd)
1758         return GPG_ERR_INV_ARG;
1759
1760     if (!pwm->ctx)
1761         return GPG_ERR_INV_STATE;
1762
1763     if (result)
1764         *result = NULL;
1765
1766     va_start(ap, cmd);
1767     error = pwmd_command_ap(pwm, result, cmd, ap);
1768     va_end(ap);
1769     return error;
1770 }
1771
1772 #ifdef WITH_PINENTRY
1773 static gpg_error_t do_getpin(pwm_t *pwm, char **result)
1774 {
1775     if (gtimeout) {
1776         signal(SIGALRM, catchsig);
1777         alarm(1);
1778     }
1779
1780     *result = NULL;
1781     return pinentry_command(pwm, result, "GETPIN");
1782 }
1783
1784 static gpg_error_t getpin(pwm_t *pwm, char **result, int which)
1785 {
1786     gpg_error_t rc;
1787
1788     gerror = 0;
1789     rc = set_pinentry_strings(pwm, which);
1790
1791     if (rc) {
1792         pinentry_disconnect(pwm);
1793         return rc;
1794     }
1795
1796     rc = do_getpin(pwm, result);
1797
1798     /*
1799      * Since there was input cancel any timeout setting.
1800      */
1801     alarm(0);
1802     signal(SIGALRM, SIG_DFL);
1803
1804     if (rc) {
1805         if (pwm->pctx)
1806             pinentry_disconnect(pwm);
1807
1808         /* This lets pwmd_open2() with PWMD_OPTION_PINENTRY_TIMEOUT work. */
1809         if (rc== GPG_ERR_EOF && gerror == GPG_ERR_TIMEOUT)
1810             return gerror;
1811
1812         return rc;
1813     }
1814
1815     return 0;
1816 }
1817 #endif
1818
1819 static gpg_error_t do_open_command(pwm_t *pwm, const char *filename, char *password)
1820 {
1821     char *buf;
1822     gpg_error_t error;
1823     char *result = NULL;
1824
1825     buf = pwmd_malloc(ASSUAN_LINELENGTH+1);
1826
1827     if (!buf)
1828         return gpg_error_from_errno(ENOMEM);
1829
1830     snprintf(buf, ASSUAN_LINELENGTH, "OPEN %s %s", filename,
1831             password ? password : "");
1832     error = send_command(pwm, &result, buf);
1833     pwmd_free(buf);
1834
1835     if (error && result)
1836         pwmd_free(result);
1837
1838     return error;
1839 }
1840
1841 static gpg_error_t send_pinentry_options(pwm_t *pwm)
1842 {
1843     gpg_error_t rc;
1844
1845     if (pwm->pinentry_path) {
1846         rc = pwmd_command(pwm, NULL, "OPTION PATH=%s", pwm->pinentry_path);
1847
1848         if (rc)
1849             return rc;
1850     }
1851
1852     if (pwm->pinentry_tty) {
1853         rc = pwmd_command(pwm, NULL, "OPTION TTYNAME=%s", pwm->pinentry_tty);
1854
1855         if (rc)
1856             return rc;
1857     }
1858
1859     if (pwm->pinentry_term) {
1860         rc = pwmd_command(pwm, NULL, "OPTION TTYTYPE=%s", pwm->pinentry_term);
1861
1862         if (rc)
1863             return rc;
1864     }
1865
1866     if (pwm->pinentry_display) {
1867         rc = pwmd_command(pwm, NULL, "OPTION TITLE=%s", pwm->pinentry_display);
1868
1869         if (rc)
1870             return rc;
1871     }
1872
1873     if (pwm->title) {
1874         rc = pwmd_command(pwm, NULL, "OPTION TITLE=%s", pwm->title);
1875
1876         if (rc)
1877             return rc;
1878     }
1879
1880     if (pwm->desc) {
1881         rc = pwmd_command(pwm, NULL, "OPTION DESC=%s", pwm->desc);
1882
1883         if (rc)
1884             return rc;
1885     }
1886
1887     if (pwm->prompt) {
1888         rc = pwmd_command(pwm, NULL, "OPTION PROMPT=%s", pwm->prompt);
1889
1890         if (rc)
1891             return rc;
1892     }
1893
1894     if (pwm->lcctype) {
1895         rc = pwmd_command(pwm, NULL, "OPTION LC_CTYPE=%s", pwm->lcctype);
1896
1897         if (rc)
1898             return rc;
1899     }
1900
1901     if (pwm->lcmessages) {
1902         rc = pwmd_command(pwm, NULL, "OPTION LC_MESSAGES=%s", pwm->lcmessages);
1903
1904         if (rc)
1905             return rc;
1906     }
1907
1908     if (pwm->pinentry_timeout >= 0) {
1909         rc = pwmd_command(pwm, NULL, "OPTION TIMEOUT=%i", pwm->pinentry_timeout);
1910
1911         if (rc)
1912             return rc;
1913     }
1914
1915     return 0;
1916 }
1917
1918 static gpg_error_t do_pwmd_open(pwm_t *pwm, const char *filename, int nb,
1919         int local_pinentry)
1920 {
1921     char *result = NULL;
1922     char *password = NULL;
1923     char *path;
1924     int pin_try;
1925     gpg_error_t rc;
1926     size_t len;
1927
1928     if (!pwm || !filename || !*filename)
1929         return GPG_ERR_INV_ARG;
1930
1931     if (!pwm->ctx)
1932         return GPG_ERR_INV_STATE;
1933
1934     pin_try = pwm->pinentry_tries - 1;
1935
1936     /*
1937      * Avoid calling pinentry if the password is cached on the server or if
1938      * this is a new file. pwmd version 2 adds a VERSION command which is
1939      * determined in _socket_connect_finalize(). If the server is version 2,
1940      * ISCACHED can determine if a file exists.
1941      */
1942 #ifdef WITH_TCP
1943     if (!pwm->tcp_conn && pwm->version == PWMD_V1) {
1944 #else
1945     if (pwm->version == PWMD_V1) {
1946 #endif
1947         rc = pwmd_command(pwm, &result, "GETCONFIG data_directory");
1948
1949         if (rc)
1950             return rc;
1951
1952         len = strlen(result)+strlen(filename)+2;
1953         path = pwmd_malloc(len);
1954
1955         if (!path) {
1956             pwmd_free(result);
1957             return gpg_error_from_errno(ENOMEM);
1958         }
1959
1960         snprintf(path, len, "%s/%s", result, filename);
1961         pwmd_free(result);
1962
1963         if (access(path, R_OK) == -1) {
1964             if (errno == ENOENT) {
1965                 pwmd_free(path);
1966                 goto gotpassword;
1967             }
1968         }
1969
1970         pwmd_free(path);
1971     }
1972
1973     rc = pwmd_command(pwm, &result, "ISCACHED %s", filename);
1974
1975     if (gpg_err_code(rc) == GPG_ERR_ENOENT)
1976         goto gotpassword;
1977
1978     if (rc && rc != GPG_ERR_NOT_FOUND)
1979         return rc;
1980
1981     if (!nb && rc == GPG_ERR_NOT_FOUND) {
1982         if (pwm->password) {
1983             password = pwm->password;
1984             goto gotpassword;
1985         }
1986
1987         if (pwm->passfunc) {
1988             rc = pwm->passfunc(pwm->passdata, &password);
1989
1990             if (rc)
1991                 return rc;
1992
1993             goto gotpassword;
1994         }
1995     }
1996
1997 #ifdef WITH_PINENTRY
1998     if (rc == GPG_ERR_NOT_FOUND && local_pinentry) {
1999         rc = pwmd_command(pwm, NULL, "OPTION PINENTRY=0");
2000
2001         if (rc)
2002             return rc;
2003
2004         if (!pwm->filename)
2005             pwm->filename = pwmd_strdup(filename);
2006
2007         if (!pwm->filename)
2008             return gpg_error_from_errno(ENOMEM);
2009
2010         /* Get the passphrase using the LOCAL pinentry. */
2011         if (nb) {
2012             int p[2];
2013             pid_t pid;
2014             pwmd_nb_status_t pw;
2015
2016             if (pipe(p) == -1)
2017                 return gpg_error_from_syserror();
2018
2019 #ifdef WITH_LIBPTH
2020             pid = pth_fork();
2021 #else
2022             pid = fork();
2023 #endif
2024
2025             switch (pid) {
2026                 case 0:
2027                     close(p[0]);
2028                     pw.fd = p[0];
2029
2030                     if (pwm->pinentry_timeout != 0) {
2031                         gpwm = pwm;
2032                         gtimeout = abs(pwm->pinentry_timeout);
2033                         gelapsed = 0;
2034                     }
2035
2036                     pw.error = getpin(pwm, &password, PINENTRY_OPEN);
2037
2038                     if (gtimeout && gelapsed >= gtimeout)
2039                         pw.error = GPG_ERR_TIMEOUT;
2040
2041                     if (!pw.error)
2042                         snprintf(pw.password, sizeof(pw.password), "%s",
2043                                 password);
2044
2045                     pinentry_disconnect(pwm);
2046 #ifdef WITH_LIBPTH
2047                     pth_write(p[1], &pw, sizeof(pw));
2048 #else
2049                     write(p[1], &pw, sizeof(pw));
2050 #endif
2051                     memset(&pw, 0, sizeof(pw));
2052                     close(p[1]);
2053                     _exit(0);
2054                     break;
2055                 case -1:
2056                     rc = gpg_error_from_syserror();
2057                     close(p[0]);
2058                     close(p[1]);
2059                     return rc;
2060                 default:
2061                     break;
2062             }
2063
2064             close(p[1]);
2065             pwm->nb_fd = p[0];
2066             pwm->nb_pid = pid;
2067             return 0;
2068         }
2069
2070         if (pwm->pinentry_timeout != 0) {
2071             gpwm = pwm;
2072             gtimeout = abs(pwm->pinentry_timeout);
2073             gelapsed = 0;
2074         }
2075
2076         rc = getpin(pwm, &password, PINENTRY_OPEN);
2077
2078         /* Don't timeout when an invalid passphrase was entered. */
2079         gtimeout = 0;
2080
2081         if (rc)
2082             return rc;
2083     }
2084 #endif
2085
2086 gotpassword:
2087     pwm->state = ASYNC_DONE;
2088
2089     if (!local_pinentry) {
2090         rc = send_pinentry_options(pwm);
2091
2092         if (rc)
2093             return rc;
2094     }
2095
2096     rc = do_open_command(pwm, filename, password);
2097
2098     /*
2099      * Keep the user defined password set with pwmd_setopt(). The password may
2100      * be needed later (pwmd_save()) depending on the pwmd file cache settings.
2101      */
2102     if (!pwm->passfunc && password && password != pwm->password)
2103         pwmd_free(password);
2104
2105     if (rc == GPG_ERR_INV_PASSPHRASE) {
2106         if (pin_try-- > 0 && !nb) {
2107
2108 #ifdef WITH_PINENTRY
2109             if (local_pinentry)
2110                 rc = getpin(pwm, &password, PINENTRY_OPEN_FAILED);
2111             else
2112 #endif
2113                 rc = pwmd_command(pwm, &result, "OPTION TITLE=%s",
2114                         N_("Invalid passphrase, please try again."));
2115
2116             if (rc)
2117                 return rc;
2118
2119             goto gotpassword;
2120         }
2121
2122 #ifdef WITH_PINENTRY
2123         if (nb)
2124             pinentry_disconnect(pwm);
2125 #endif
2126
2127         return rc;
2128     }
2129
2130     if (!rc) {
2131         if (pwm->filename)
2132             pwmd_free(pwm->filename);
2133
2134         pwm->filename = pwmd_strdup(filename);
2135     }
2136
2137     return rc;
2138 }
2139
2140 gpg_error_t pwmd_open2(pwm_t *pwm, const char *filename)
2141 {
2142 #ifndef WITH_PINENTRY
2143     return GPG_ERR_NOT_IMPLEMENTED;
2144 #else
2145     return do_pwmd_open(pwm, filename, 0, 1);
2146 #endif
2147 }
2148
2149 gpg_error_t pwmd_open(pwm_t *pwm, const char *filename)
2150 {
2151     return do_pwmd_open(pwm, filename, 0, 0);
2152 }
2153
2154 gpg_error_t pwmd_open_async2(pwm_t *pwm, const char *filename)
2155 {
2156 #ifndef WITH_PINENTRY
2157     return GPG_ERR_NOT_IMPLEMENTED;
2158 #else
2159     gpg_error_t rc;
2160
2161     if (!pwm || !filename)
2162         return GPG_ERR_INV_ARG;
2163
2164     if (!pwm->ctx)
2165         return GPG_ERR_INV_STATE;
2166
2167     if (pwm->cmd != ASYNC_CMD_OPEN2)
2168         pwm->pin_try = 0;
2169
2170     pwm->cmd = ASYNC_CMD_OPEN2;
2171     pwm->state = ASYNC_PROCESS;
2172     rc = do_pwmd_open(pwm, filename, 1, 1);
2173
2174     if (rc)
2175         reset_async(pwm, 1);
2176
2177     return rc;
2178 #endif
2179 }
2180
2181 #ifdef WITH_PINENTRY
2182 static gpg_error_t do_save_getpin(pwm_t *pwm, char **password)
2183 {
2184     int confirm = 0;
2185     gpg_error_t error;
2186     char *result = NULL;
2187
2188 again:
2189     error = getpin(pwm, &result, confirm ? PINENTRY_SAVE_CONFIRM : PINENTRY_SAVE);
2190
2191     if (error) {
2192         if (pwm->pctx)
2193             pinentry_disconnect(pwm);
2194
2195         if (*password)
2196             pwmd_free(*password);
2197
2198         return error;
2199     }
2200
2201     if (!confirm++) {
2202         *password = result;
2203         goto again;
2204     }
2205
2206     if (strcmp(*password, result)) {
2207         pwmd_free(*password);
2208         pwmd_free(result);
2209         confirm = 0;
2210         *password = NULL;
2211         goto again;
2212     }
2213
2214     pwmd_free(result);
2215     pinentry_disconnect(pwm);
2216     return 0;
2217 }
2218 #endif
2219
2220 static gpg_error_t do_save_command(pwm_t *pwm, char *password)
2221 {
2222     char *buf;
2223     gpg_error_t error;
2224     char *result = NULL;
2225
2226     buf = pwmd_malloc(ASSUAN_LINELENGTH+1);
2227
2228     if (!buf)
2229         return gpg_error_from_errno(ENOMEM);
2230
2231     snprintf(buf, ASSUAN_LINELENGTH, "SAVE %s", password ? password : "");
2232     error = send_command(pwm, &result, buf);
2233     pwmd_free(buf);
2234
2235     if (error && result)
2236         pwmd_free(result);
2237
2238     return error;
2239 }
2240
2241 static gpg_error_t do_pwmd_save(pwm_t *pwm, int nb, int local_pinentry)
2242 {
2243     char *result = NULL;
2244     char *password = NULL;
2245     gpg_error_t rc;
2246
2247     if (!pwm)
2248         return GPG_ERR_INV_ARG;
2249
2250     if (!pwm->ctx)
2251         return GPG_ERR_INV_STATE;
2252
2253     rc = pwmd_command(pwm, &result, "ISCACHED %s", pwm->filename);
2254
2255     if (rc && rc != GPG_ERR_NOT_FOUND)
2256         return rc;
2257
2258     if (!nb && rc == GPG_ERR_NOT_FOUND) {
2259         if (pwm->password) {
2260             password = pwm->password;
2261             goto gotpassword;
2262         }
2263
2264         if (pwm->passfunc) {
2265             rc = pwm->passfunc(pwm->passdata, &password);
2266
2267             if (rc)
2268                 return rc;
2269
2270             goto gotpassword;
2271         }
2272     }
2273
2274     if (rc == GPG_ERR_NOT_FOUND && local_pinentry) {
2275 #ifdef WITH_PINENTRY
2276         /* Get the password using the LOCAL pinentry. */
2277         if (nb) {
2278             int p[2];
2279             pid_t pid;
2280             pwmd_nb_status_t pw;
2281
2282             if (pipe(p) == -1)
2283                 return gpg_error_from_syserror();
2284
2285 #ifdef WITH_LIBPTH
2286             pid = pth_fork();
2287 #else
2288             pid = fork();
2289 #endif
2290
2291             switch (pid) {
2292                 case 0:
2293                     close(p[0]);
2294                     pw.fd = p[0];
2295                     password = NULL;
2296                     pw.error = do_save_getpin(pwm, &password);
2297                     pinentry_disconnect(pwm);
2298                     snprintf(pw.password, sizeof(pw.password), "%s",
2299                             password);
2300 #ifdef WITH_LIBPTH
2301                     pth_write(p[1], &pw, sizeof(pw));
2302 #else
2303                     write(p[1], &pw, sizeof(pw));
2304 #endif
2305                     memset(&pw, 0, sizeof(pw));
2306                     close(p[1]);
2307                     _exit(0);
2308                     break;
2309                 case -1:
2310                     rc = gpg_error_from_syserror();
2311                     close(p[0]);
2312                     close(p[1]);
2313                     return rc;
2314                 default:
2315                     break;
2316             }
2317
2318             close(p[1]);
2319             pwm->nb_fd = p[0];
2320             pwm->nb_pid = pid;
2321             return 0;
2322         }
2323
2324         rc = do_save_getpin(pwm, &password);
2325
2326         if (rc)
2327             return rc;
2328 #endif
2329     }
2330     else
2331         pwm->state = ASYNC_DONE;
2332
2333 gotpassword:
2334     if (!local_pinentry) {
2335         rc = send_pinentry_options(pwm);
2336
2337         if (rc)
2338             return rc;
2339     }
2340
2341     rc = do_save_command(pwm, password);
2342
2343     if (!pwm->passfunc && password && password != pwm->password)
2344         pwmd_free(password);
2345
2346     return rc;
2347 }
2348
2349 gpg_error_t pwmd_save_async2(pwm_t *pwm)
2350 {
2351 #ifndef WITH_PINENTRY
2352     return GPG_ERR_NOT_IMPLEMENTED;
2353 #else
2354     gpg_error_t rc;
2355
2356     if (!pwm)
2357         return GPG_ERR_INV_ARG;
2358
2359     if (!pwm->ctx)
2360         return GPG_ERR_INV_STATE;
2361
2362     pwm->cmd = ASYNC_CMD_SAVE2;
2363     pwm->state = ASYNC_PROCESS;
2364     rc = do_pwmd_save(pwm, 1, 1);
2365
2366     if (rc)
2367         reset_async(pwm, 0);
2368
2369     return rc;
2370 #endif
2371 }
2372
2373 gpg_error_t pwmd_save2(pwm_t *pwm)
2374 {
2375 #ifndef WITH_PINENTRY
2376     return GPG_ERR_NOT_IMPLEMENTED;
2377 #else
2378     return do_pwmd_save(pwm, 0, 1);
2379 #endif
2380 }
2381
2382 gpg_error_t pwmd_save(pwm_t *pwm)
2383 {
2384     return do_pwmd_save(pwm, 0, 0);
2385 }
2386
2387 gpg_error_t pwmd_setopt(pwm_t *pwm, pwmd_option_t opt, ...)
2388 {
2389     va_list ap;
2390     int n = va_arg(ap, int);
2391     char *arg1;
2392     gpg_error_t error = 0;
2393
2394     if (!pwm)
2395         return GPG_ERR_INV_ARG;
2396
2397     va_start(ap, opt);
2398
2399     switch (opt) {
2400         case PWMD_OPTION_STATUS_CB:
2401             pwm->status_func = va_arg(ap, pwmd_status_cb_t);
2402             break;
2403         case PWMD_OPTION_STATUS_DATA:
2404             pwm->status_data = va_arg(ap, void *);
2405             break;
2406         case PWMD_OPTION_PASSPHRASE_CB:
2407             pwm->passfunc = va_arg(ap, pwmd_passphrase_cb_t);
2408             break;
2409         case PWMD_OPTION_PASSPHRASE_DATA:
2410             pwm->passdata = va_arg(ap, void *);
2411             break;
2412         case PWMD_OPTION_PASSPHRASE:
2413             arg1 = va_arg(ap, char *);
2414
2415             if (pwm->password)
2416                 pwmd_free(pwm->password);
2417
2418             pwm->password = pwmd_strdup(arg1);
2419             break;
2420         case PWMD_OPTION_PINENTRY_TRIES:
2421             n = va_arg(ap, int);
2422
2423             if (n <= 0) {
2424                 va_end(ap);
2425                 error = GPG_ERR_INV_VALUE;
2426             }
2427             else
2428                 pwm->pinentry_tries = n;
2429             break;
2430         case PWMD_OPTION_PINENTRY_TIMEOUT:
2431             n = va_arg(ap, int);
2432
2433             if (n < 0) {
2434                 va_end(ap);
2435                 error = GPG_ERR_INV_VALUE;
2436             }
2437             else
2438                 pwm->pinentry_timeout = n;
2439             break;
2440         case PWMD_OPTION_PINENTRY_PATH:
2441             if (pwm->pinentry_path)
2442                 pwmd_free(pwm->pinentry_path);
2443
2444             pwm->pinentry_path = pwmd_strdup(va_arg(ap, char *));
2445             break;
2446         case PWMD_OPTION_PINENTRY_TTY:
2447             if (pwm->pinentry_tty)
2448                 pwmd_free(pwm->pinentry_tty);
2449
2450             pwm->pinentry_tty = pwmd_strdup(va_arg(ap, char *));
2451             break;
2452         case PWMD_OPTION_PINENTRY_DISPLAY:
2453             if (pwm->pinentry_display)
2454                 pwmd_free(pwm->pinentry_display);
2455
2456             pwm->pinentry_display = pwmd_strdup(va_arg(ap, char *));
2457             break;
2458         case PWMD_OPTION_PINENTRY_TERM:
2459             if (pwm->pinentry_term)
2460                 pwmd_free(pwm->pinentry_term);
2461
2462             pwm->pinentry_term = pwmd_strdup(va_arg(ap, char *));
2463             break;
2464         case PWMD_OPTION_PINENTRY_TITLE:
2465             if (pwm->title)
2466                 pwmd_free(pwm->title);
2467
2468             pwm->title = percent_escape(va_arg(ap, char *));
2469             break;
2470         case PWMD_OPTION_PINENTRY_PROMPT:
2471             if (pwm->prompt)
2472                 pwmd_free(pwm->prompt);
2473
2474             pwm->prompt = percent_escape(va_arg(ap, char *));
2475             break;
2476         case PWMD_OPTION_PINENTRY_DESC:
2477             if (pwm->desc)
2478                 pwmd_free(pwm->desc);
2479
2480             pwm->desc = percent_escape(va_arg(ap, char *));
2481             break;
2482         case PWMD_OPTION_PINENTRY_LC_CTYPE:
2483             if (pwm->lcctype)
2484                 pwmd_free(pwm->lcctype);
2485
2486             pwm->lcctype = pwmd_strdup(va_arg(ap, char *));
2487             break;
2488         case PWMD_OPTION_PINENTRY_LC_MESSAGES:
2489             if (pwm->lcmessages)
2490                 pwmd_free(pwm->lcmessages);
2491
2492             pwm->lcmessages = pwmd_strdup(va_arg(ap, char *));
2493             break;
2494 #ifdef WITH_TCP
2495         case PWMD_OPTION_IP_VERSION:
2496             n = va_arg(ap, int);
2497
2498             switch (n) {
2499                 case PWMD_IP_ANY:
2500                 case PWMD_IPV4:
2501                 case PWMD_IPV6:
2502                     pwm->prot = n;
2503                     break;
2504                 default:
2505                     error = GPG_ERR_INV_VALUE;
2506                     break;
2507             }
2508
2509             va_end(ap);
2510             break;
2511 #endif
2512         default:
2513             error = GPG_ERR_NOT_IMPLEMENTED;
2514             break;
2515     }
2516
2517     va_end(ap);
2518     return error;
2519 }
2520
2521 gpg_error_t pwmd_get_fds(pwm_t *pwm, pwmd_fd_t *fds, int *n_fds)
2522 {
2523     int in_total;
2524     int fd = 0;
2525 #ifdef WITH_TCP
2526     int afds[ARES_GETSOCK_MAXNUM];
2527     int got_sock = 0;
2528     int n, i;
2529 #endif
2530
2531     if (!pwm || !fds || !n_fds || *n_fds <= 0)
2532         return GPG_ERR_INV_ARG;
2533
2534     in_total = *n_fds;
2535 #ifdef WITH_TCP
2536     memset(afds, 0, sizeof(int)*ARES_GETSOCK_MAXNUM);
2537 #endif
2538     memset(fds, 0, sizeof(pwmd_fd_t)*in_total);
2539     *n_fds = 0;
2540
2541     switch (pwm->cmd) {
2542         default:
2543         case ASYNC_CMD_NONE:
2544         case ASYNC_CMD_OPEN:
2545         case ASYNC_CMD_SAVE:
2546 #ifdef WITH_PINENTRY
2547 async1:
2548 #endif
2549             if (pwm->fd == -1)
2550                 return GPG_ERR_INV_STATE;
2551
2552             (*n_fds)++;
2553             fds[fd].fd = pwm->fd;
2554             fds[fd++].flags = PWMD_FD_READABLE;
2555             return 0;
2556 #ifdef WITH_PINENTRY
2557         case ASYNC_CMD_OPEN2:
2558         case ASYNC_CMD_SAVE2:
2559             if (pwm->nb_fd == -1)
2560                 return GPG_ERR_INV_STATE;
2561
2562             (*n_fds)++;
2563             fds[fd].fd = pwm->nb_fd;
2564             fds[fd++].flags = PWMD_FD_READABLE;
2565             goto async1;
2566 #endif
2567 #ifdef WITH_TCP
2568         case ASYNC_CMD_DNS:
2569             if (!pwm->tcp_conn || !pwm->tcp_conn->chan)
2570                 return GPG_ERR_INV_STATE;
2571
2572             n = ares_getsock(pwm->tcp_conn->chan, afds, ARES_GETSOCK_MAXNUM);
2573
2574             for (i = 0; i < ARES_GETSOCK_MAXNUM; i++) {
2575                 got_sock = 0;
2576
2577                 if (fd > in_total) {
2578                     *n_fds = fd;
2579                     return GPG_ERR_ERANGE;
2580                 }
2581
2582                 if (ARES_GETSOCK_READABLE(n, i)) {
2583                     got_sock++;
2584                     fds[fd].flags |= PWMD_FD_READABLE;
2585                 }
2586
2587                 if (ARES_GETSOCK_WRITABLE(n, i)) {
2588                     got_sock++;
2589                     fds[fd].flags |= PWMD_FD_WRITABLE;
2590                 }
2591
2592                 if (got_sock)
2593                     fds[fd++].fd = afds[i];
2594             }
2595
2596             *n_fds = fd;
2597             return 0;
2598         case ASYNC_CMD_CONNECT:
2599         case ASYNC_CMD_HOSTKEY:
2600             if (!pwm->tcp_conn || pwm->tcp_conn->fd == -1)
2601                 return GPG_ERR_INV_STATE;
2602
2603             (*n_fds)++;
2604             fds[fd].fd = pwm->tcp_conn->fd;
2605             fds[fd++].flags = PWMD_FD_READABLE;
2606             return 0;
2607 #endif
2608     }
2609
2610     return GPG_ERR_INV_STATE;
2611 }
2612
2613 pwm_t *pwmd_new(const char *name)
2614 {
2615     pwm_t *h = pwmd_calloc(1, sizeof(pwm_t));
2616
2617     if (!h)
2618         return NULL;
2619
2620     if (name) {
2621         h->name = pwmd_strdup(name);
2622
2623         if (!h->name) {
2624             pwmd_free(h);
2625             return NULL;
2626         }
2627     }
2628
2629     h->fd = -1;
2630 #ifdef WITH_PINENTRY
2631     h->nb_fd = -1;
2632 #endif
2633     h->pinentry_timeout = -30;
2634     h->pinentry_tries = 3;
2635 #ifdef WITH_TCP
2636     h->prot = PWMD_IP_ANY;
2637 #endif
2638     return h;
2639 }
2640
2641 void pwmd_free(void *ptr)
2642 {
2643     xfree(ptr);
2644 }
2645
2646 void *pwmd_malloc(size_t size)
2647 {
2648     return xmalloc(size);
2649 }
2650
2651 void *pwmd_calloc(size_t nmemb, size_t size)
2652 {
2653     return xcalloc(nmemb, size);
2654 }
2655
2656 void *pwmd_realloc(void *ptr, size_t size)
2657 {
2658     return xrealloc(ptr, size);
2659 }
2660
2661 char *pwmd_strdup(const char *str)
2662 {
2663     return xstrdup(str);
2664 }
2665
2666 char *pwmd_strdup_printf(const char *fmt, ...)
2667 {
2668     va_list ap;
2669     int len;
2670     char *buf;
2671
2672     if (!fmt)
2673         return NULL;
2674
2675     va_start(ap, fmt);
2676     len = vsnprintf(NULL, 0, fmt, ap);
2677     buf = pwmd_malloc(++len);
2678
2679     if (!buf) {
2680         va_end(ap);
2681         return NULL;
2682     }
2683
2684     vsnprintf(buf, len, fmt, ap);
2685     va_end(ap);
2686     return buf;
2687 }