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 #ifdef WITH_PINENTRY
  72 static pwm_t *gpwm;
  73 static int gelapsed, gtimeout;
  74 static gpg_error_t pinentry_command(pwm_t *pwm, char **result, const char *cmd);
  75 #endif
  76
  77 static char *_getpwuid(struct passwd *pwd)
  78 {
  79     size_t size = sysconf(_SC_GETPW_R_SIZE_MAX);
  80     struct passwd *result;
  81     char *buf;
  82     int n;
  83
  84     if (size == -1)
  85         size = 16384;
  86
  87     buf = pwmd_malloc(size);
  88
  89     if (!buf)
  90         return NULL;
  91
  92     n = getpwuid_r(getuid(), pwd, buf, size, &result);
  93
  94     if (n) {
  95         pwmd_free(buf);
  96         errno = n;
  97         return NULL;
  98     }
  99
 100     if (!result) {
 101         pwmd_free(buf);
 102         return NULL;
 103     }
 104
 105     errno = n;
 106     return buf;
 107 }
 108
 109 static const char *_pwmd_strerror(gpg_error_t e)
 110 {
 111     gpg_err_code_t code = gpg_err_code(e);
 112
 113     if (code >= GPG_ERR_USER_1 && code < gpg_err_code(EPWMD_MAX)) {
 114         switch (code) {
 115             default:
 116                 return NULL;
 117             case GPG_ERR_USER_1:
 118                 return N_("Unknown error");
 119             case GPG_ERR_USER_2:
 120                 return N_("No cache slots available");
 121             case GPG_ERR_USER_3:
 122                 return N_("Recursion loop");
 123             case GPG_ERR_USER_4:
 124                 return N_("No file is open");
 125             case GPG_ERR_USER_5:
 126                 return N_("General LibXML error");
 127             case GPG_ERR_USER_6:
 128                 return N_("File modified");
 129         }
 130     }
 131
 132     return NULL;
 133 }
 134
 135 const char *pwmd_strerror(gpg_error_t code)
 136 {
 137     const char *p = _pwmd_strerror(code);
 138
 139     return p ? p : gpg_strerror(code);
 140 }
 141
 142 int pwmd_strerror_r(gpg_error_t code, char *buf, size_t size)
 143 {
 144     const char *p = _pwmd_strerror(code);
 145
 146     if (p) {
 147         snprintf(buf, size, "%s", p);
 148
 149         if (strlen(p) > size)
 150             return ERANGE;
 151
 152         return 0;
 153     }
 154
 155     return gpg_strerror_r(code, buf, size);
 156 }
 157
 158 gpg_error_t pwmd_init()
 159 {
 160     static int initialized;
 161
 162     if (initialized)
 163         return 0;
 164
 165 #ifndef MEM_DEBUG
 166     xmem_init();
 167 #endif
 168 #ifdef ENABLE_NLS
 169     bindtextdomain("libpwmd", LOCALEDIR);
 170 #endif
 171     gpg_err_init();
 172     assuan_set_malloc_hooks(pwmd_malloc, pwmd_realloc, pwmd_free);
 173     assuan_set_assuan_err_source(GPG_ERR_SOURCE_DEFAULT);
 174     initialized = 1;
 175     return 0;
 176 }
 177
 178 static gpg_error_t _socket_connect_finalize(pwm_t *pwm)
 179 {
 180     int active[2];
 181     int n = assuan_get_active_fds(pwm->ctx, 0, active, N_ARRAY(active));
 182
 183     if (n <= 0)
 184         return GPG_ERR_EBADFD;
 185
 186     pwm->fd = active[0];
 187 #ifdef WITH_PINENTRY
 188     pwm->pid = -1;
 189     pwm->pinentry_tries = 3;
 190 #endif
 191     assuan_set_pointer(pwm->ctx, pwm);
 192
 193     if (pwm->name)
 194         return pwmd_command(pwm, NULL, "OPTION CLIENT NAME=%s", pwm->name);
 195
 196     return 0;
 197 }
 198
 199 #ifdef WITH_TCP
 200 static int read_hook(assuan_context_t ctx, assuan_fd_t fd, void *data,
 201         size_t len, ssize_t *ret)
 202 {
 203     pwm_t *pwm = assuan_get_pointer(ctx);
 204     int n = 0;
 205
 206     if (!pwm || !pwm->tcp_conn)
 207 #ifdef WITH_LIBPTH
 208         *ret = pth_read((int)fd, data, len);
 209 #else
 210         *ret = read((int)fd, data, len);
 211 #endif
 212     else {
 213         do {
 214             *ret = libssh2_channel_read(pwm->tcp_conn->channel, data, len);
 215             n = libssh2_session_last_errno(pwm->tcp_conn->session);
 216         } while (n == LIBSSH2_ERROR_EAGAIN);
 217     }
 218
 219     return !n && *ret != -1 ? 1 : 0;
 220 }
 221
 222 static int write_hook(assuan_context_t ctx, assuan_fd_t fd, const void *data,
 223         size_t len, ssize_t *ret)
 224 {
 225     pwm_t *pwm = assuan_get_pointer(ctx);
 226     int n = 0;
 227
 228     if (!pwm || !pwm->tcp_conn)
 229 #ifdef WITH_LIBPTH
 230         *ret = pth_write((int)fd, data, len);
 231 #else
 232         *ret = write((int)fd, data, len);
 233 #endif
 234     else {
 235         do {
 236             *ret = libssh2_channel_write(pwm->tcp_conn->channel, data, len);
 237             n = libssh2_session_last_errno(pwm->tcp_conn->session);
 238         } while (n == LIBSSH2_ERROR_EAGAIN);
 239     }
 240
 241     return !n && *ret != -1 ? 1 : 0;
 242 }
 243
 244 static void _ssh_deinit(pwmd_tcp_conn_t *conn);
 245 static void free_tcp_conn(pwmd_tcp_conn_t *conn)
 246 {
 247     if (!conn)
 248         return;
 249
 250     if (conn->username) {
 251         pwmd_free(conn->username);
 252         conn->username = NULL;
 253     }
 254
 255     if (conn->known_hosts) {
 256         pwmd_free(conn->known_hosts);
 257         conn->known_hosts = NULL;
 258     }
 259
 260     if (conn->identity) {
 261         pwmd_free(conn->identity);
 262         conn->identity = NULL;
 263     }
 264
 265     if (conn->identity_pub) {
 266         pwmd_free(conn->identity_pub);
 267         conn->identity_pub = NULL;
 268     }
 269
 270     if (conn->host) {
 271         pwmd_free(conn->host);
 272         conn->host = NULL;
 273     }
 274
 275     if (conn->hostkey) {
 276         pwmd_free(conn->hostkey);
 277         conn->hostkey = NULL;
 278     }
 279
 280     if (conn->chan) {
 281         ares_destroy(conn->chan);
 282         conn->chan = NULL;
 283     }
 284
 285     if (conn->he) {
 286         ares_free_hostent(conn->he);
 287         conn->he = NULL;
 288     }
 289
 290     if (conn->fd >= 0) {
 291         close(conn->fd);
 292         conn->fd = -1;
 293     }
 294
 295     if (conn->session)
 296         _ssh_deinit(conn);
 297     else
 298         pwmd_free(conn);
 299 }
 300
 301 static void _ssh_deinit(pwmd_tcp_conn_t *conn)
 302 {
 303     if (!conn)
 304         return;
 305
 306     if (conn->channel)
 307         libssh2_channel_free(conn->channel);
 308
 309     if (conn->session) {
 310         libssh2_session_disconnect(conn->session, "Bye!");
 311         libssh2_session_free(conn->session);
 312     }
 313
 314     conn->session = NULL;
 315     conn->channel = NULL;
 316     free_tcp_conn(conn);
 317 }
 318
 319 static void _ssh_assuan_deinit(assuan_context_t ctx)
 320 {
 321     pwm_t *pwm = assuan_get_pointer(ctx);
 322
 323     pwm->tcp_conn->fd = -1;
 324     _ssh_deinit(pwm->tcp_conn);
 325     pwm->tcp_conn = NULL;
 326 }
 327
 328 /*
 329  * Sets common options from both pwmd_ssh_connect() and
 330  * pwmd_ssh_connect_async().
 331  */
 332 static gpg_error_t init_tcp_conn(pwmd_tcp_conn_t **dst, const char *host,
 333         int port, const char *identity, const char *user, const char *hosts,
 334         int get)
 335 {
 336     pwmd_tcp_conn_t *conn;
 337     gpg_error_t rc = 0;
 338
 339     if (get) {
 340         if (!host)
 341             return GPG_ERR_INV_ARG;
 342     }
 343     else {
 344         if (!host || !identity || !hosts)
 345             return GPG_ERR_INV_ARG;
 346     }
 347
 348     conn = pwmd_calloc(1, sizeof(pwmd_tcp_conn_t));
 349
 350     if (!conn)
 351         return gpg_error_from_errno(ENOMEM);
 352
 353     conn->port = port == -1 ? 22 : port;
 354     conn->host = pwmd_strdup(host);
 355
 356     if (!conn->host) {
 357         rc = gpg_error_from_errno(ENOMEM);
 358         goto fail;
 359     }
 360
 361     if (!get) {
 362         struct passwd pw;
 363         char *pwbuf = _getpwuid(&pw);
 364
 365         if (!pwbuf) {
 366             rc = gpg_error_from_errno(errno);
 367             goto fail;
 368         }
 369
 370         conn->username = pwmd_strdup(user ? user : pw.pw_name);
 371         pwmd_free(pwbuf);
 372
 373         if (!conn->username) {
 374             rc = gpg_error_from_errno(ENOMEM);
 375             goto fail;
 376         }
 377
 378         conn->identity = pwmd_strdup(identity);
 379
 380         if (!conn->identity) {
 381             rc = gpg_error_from_errno(ENOMEM);
 382             goto fail;
 383         }
 384
 385         conn->identity_pub = pwmd_malloc(strlen(conn->identity)+5);
 386
 387         if (!conn->identity_pub) {
 388             rc = gpg_error_from_errno(ENOMEM);
 389             goto fail;
 390         }
 391
 392         sprintf(conn->identity_pub, "%s.pub", conn->identity);
 393         conn->known_hosts = pwmd_strdup(hosts);
 394
 395         if (!conn->known_hosts) {
 396             rc = gpg_error_from_errno(ENOMEM);
 397             goto fail;
 398         }
 399     }
 400
 401     *dst = conn;
 402     return 0;
 403
 404 fail:
 405     free_tcp_conn(conn);
 406     return rc;
 407 }
 408
 409 static gpg_error_t do_connect(pwm_t *pwm, int prot, void *addr)
 410 {
 411     struct sockaddr_in their_addr;
 412
 413     pwm->tcp_conn->fd = socket(prot, SOCK_STREAM, 0);
 414
 415     if (pwm->tcp_conn->fd == -1)
 416         return gpg_error_from_syserror();
 417
 418     if (pwm->tcp_conn->async)
 419         fcntl(pwm->tcp_conn->fd, F_SETFL, O_NONBLOCK);
 420
 421     pwm->cmd = ASYNC_CMD_CONNECT;
 422     their_addr.sin_family = prot;
 423     their_addr.sin_port = htons(pwm->tcp_conn->port);
 424     their_addr.sin_addr = *((struct in_addr *)addr);
 425     memset(their_addr.sin_zero, '\0', sizeof their_addr.sin_zero);
 426
 427 #ifdef WITH_LIBPTH
 428     if (pth_connect(pwm->tcp_conn->fd, (struct sockaddr *)&their_addr,
 429                 sizeof(their_addr)) == -1)
 430 #else
 431     if (connect(pwm->tcp_conn->fd, (struct sockaddr *)&their_addr,
 432                 sizeof(their_addr)) == -1)
 433 #endif
 434         return gpg_error_from_syserror();
 435
 436     return 0;
 437 }
 438
 439 static gpg_error_t ares_error_to_pwmd(int status)
 440 {
 441     if (status != ARES_SUCCESS)
 442         warnx("%s", ares_strerror(status));
 443
 444     switch (status) {
 445         case ARES_ENODATA:
 446         case ARES_EFORMERR:
 447         case ARES_ENOTFOUND:
 448             return GPG_ERR_UNKNOWN_HOST;
 449         case ARES_ESERVFAIL:
 450              return GPG_ERR_EHOSTDOWN;
 451         case ARES_ETIMEOUT:
 452             return GPG_ERR_TIMEOUT;
 453         case ARES_ENOMEM:
 454             return gpg_error_from_errno(ENOMEM);
 455         case ARES_ECONNREFUSED:
 456             return GPG_ERR_ECONNREFUSED;
 457         default:
 458             /* FIXME ??? */
 459             return GPG_ERR_EHOSTUNREACH;
 460     }
 461
 462     return ARES_SUCCESS;
 463 }
 464
 465 static void dns_resolve_cb(void *arg, int status, int timeouts,
 466         unsigned char *abuf, int alen)
 467 {
 468     pwm_t *pwm = arg;
 469     int rc;
 470     struct hostent *he;
 471
 472     if (status == ARES_EDESTRUCTION)
 473         return;
 474
 475     if (status != ARES_SUCCESS) {
 476         pwm->tcp_conn->rc = ares_error_to_pwmd(status);
 477         return;
 478     }
 479
 480     /* Check for an IPv6 address first. */
 481     if (pwm->prot == PWMD_IP_ANY || pwm->prot == PWMD_IPV6)
 482         rc = ares_parse_aaaa_reply(abuf, alen, &he, NULL, NULL);
 483     else
 484         rc = ares_parse_a_reply(abuf, alen, &he, NULL, NULL);
 485
 486     if (rc != ARES_SUCCESS) {
 487         if (pwm->prot != PWMD_IP_ANY || rc != ARES_ENODATA) {
 488             pwm->tcp_conn->rc = ares_error_to_pwmd(status);
 489             return;
 490         }
 491
 492         rc = ares_parse_a_reply(abuf, alen, &he, NULL, NULL);
 493
 494         if (rc != ARES_SUCCESS) {
 495             pwm->tcp_conn->rc = ares_error_to_pwmd(status);
 496             return;
 497         }
 498     }
 499
 500     pwm->tcp_conn->he = he;
 501     pwm->tcp_conn->rc = do_connect(pwm, he->h_addrtype, he->h_addr);
 502 }
 503
 504 static gpg_error_t _do_pwmd_tcp_connect_async(pwm_t *pwm, const char *host,
 505         int port, const char *identity, const char *user,
 506         const char *known_hosts, pwmd_async_cmd_t which)
 507 {
 508     pwmd_tcp_conn_t *conn;
 509     gpg_error_t rc;
 510
 511     rc = init_tcp_conn(&conn, host, port, identity, user, known_hosts,
 512             which == ASYNC_CMD_HOSTKEY ? 1 : 0);
 513
 514     if (rc)
 515         return rc;
 516
 517     conn->async = 1;
 518     pwm->tcp_conn = conn;
 519     pwm->tcp_conn->cmd = which;
 520
 521     if (pwm->tcp_conn->cmd == ASYNC_CMD_HOSTKEY)
 522         pwm->tcp_conn->get_only = 1;
 523
 524     pwm->cmd = ASYNC_CMD_DNS;
 525     pwm->state = ASYNC_PROCESS;
 526     ares_init(&pwm->tcp_conn->chan);
 527     ares_query(pwm->tcp_conn->chan, pwm->tcp_conn->host, ns_c_any, ns_t_any,
 528             dns_resolve_cb, pwm);
 529     return 0;
 530 }
 531
 532 gpg_error_t pwmd_ssh_connect_async(pwm_t *pwm, const char *host, int port,
 533         const char *identity, const char *user, const char *known_hosts)
 534 {
 535     return _do_pwmd_tcp_connect_async(pwm, host, port, identity, user,
 536             known_hosts, ASYNC_CMD_CONNECT);
 537 }
 538
 539 static void *_ssh_malloc(size_t size, void **data)
 540 {
 541     return pwmd_malloc(size);
 542 }
 543
 544 static void _ssh_free(void *ptr, void **data)
 545 {
 546     pwmd_free(ptr);
 547 }
 548
 549 static void *_ssh_realloc(void *ptr, size_t size, void **data)
 550 {
 551     return pwmd_realloc(ptr, size);
 552 }
 553
 554 static char *to_hex(const char *str, size_t slen)
 555 {
 556     int i;
 557     char *buf = pwmd_malloc(slen*2+1);
 558
 559     if (!buf)
 560         return NULL;
 561
 562     for (i = 0, buf[0] = 0; i < slen; i++) {
 563         char tmp[3];
 564
 565         sprintf(tmp, "%02x", (unsigned char)str[i]);
 566         strcat(buf, tmp);
 567     }
 568
 569     return buf;
 570 }
 571
 572 static int verify_host_key(pwm_t *pwm)
 573 {
 574     FILE *fp = fopen(pwm->tcp_conn->known_hosts, "r");
 575     char *buf, *p;
 576
 577     if (!fp)
 578         return 1;
 579
 580     buf = pwmd_malloc(LINE_MAX);
 581
 582     if (!buf)
 583         goto fail;
 584
 585     while ((p = fgets(buf, LINE_MAX, fp))) {
 586         if (*p == '#' || isspace(*p))
 587             continue;
 588
 589         if (p[strlen(p)-1] == '\n')
 590             p[strlen(p)-1] = 0;
 591
 592         if (!strcmp(buf, pwm->tcp_conn->hostkey))
 593             goto done;
 594     }
 595
 596 fail:
 597     if (buf)
 598         pwmd_free(buf);
 599
 600     fclose(fp);
 601     return 1;
 602
 603 done:
 604     pwmd_free(buf);
 605     fclose(fp);
 606     return 0;
 607 }
 608
 609 static gpg_error_t authenticate_ssh(pwm_t *pwm)
 610 {
 611     const char *fp = libssh2_hostkey_hash(pwm->tcp_conn->session,
 612             LIBSSH2_HOSTKEY_HASH_SHA1);
 613     char *userauth;
 614
 615     pwm->tcp_conn->hostkey = to_hex(fp, 20);
 616
 617     if (!pwm->tcp_conn->hostkey)
 618         return gpg_error_from_errno(ENOMEM);
 619
 620     if (pwm->tcp_conn->get_only)
 621         return 0;
 622
 623     if (!fp || verify_host_key(pwm))
 624         return GPG_ERR_CHECKSUM;
 625
 626     userauth = libssh2_userauth_list(pwm->tcp_conn->session,
 627             pwm->tcp_conn->username, strlen(pwm->tcp_conn->username));
 628
 629     if (!userauth || !strstr(userauth, "publickey"))
 630         return GPG_ERR_BAD_PIN_METHOD;
 631
 632     if (libssh2_userauth_publickey_fromfile(pwm->tcp_conn->session,
 633                 pwm->tcp_conn->username, pwm->tcp_conn->identity_pub,
 634                 pwm->tcp_conn->identity, NULL))
 635         return GPG_ERR_BAD_SECKEY;
 636
 637     return 0;
 638 }
 639
 640 static gpg_error_t setup_tcp_session(pwm_t *pwm)
 641 {
 642     assuan_context_t ctx;
 643     struct assuan_io_hooks io_hooks = {read_hook, write_hook};
 644     gpg_error_t rc;
 645
 646     pwm->tcp_conn->session = libssh2_session_init_ex(_ssh_malloc, _ssh_free,
 647             _ssh_realloc, NULL);
 648
 649     if (!pwm->tcp_conn->session) {
 650         rc = gpg_error_from_errno(ENOMEM);
 651         goto fail;
 652     }
 653
 654     if (libssh2_session_startup(pwm->tcp_conn->session, pwm->tcp_conn->fd)) {
 655         rc = GPG_ERR_ASSUAN_SERVER_FAULT;
 656         goto fail;
 657     }
 658
 659     rc = authenticate_ssh(pwm);
 660
 661     if (rc)
 662         goto fail;
 663
 664     /* pwmd_get_hostkey(). */
 665     if (pwm->tcp_conn->get_only) {
 666         pwm->result = pwmd_strdup(pwm->tcp_conn->hostkey);
 667
 668         if (!pwm->result) {
 669             rc = gpg_error_from_errno(ENOMEM);
 670             goto fail;
 671         }
 672
 673         return 0;
 674     }
 675
 676     pwm->tcp_conn->channel = libssh2_channel_open_session(pwm->tcp_conn->session);
 677
 678     if (!pwm->tcp_conn->channel) {
 679         rc = GPG_ERR_ASSUAN_SERVER_FAULT;
 680         goto fail;
 681     }
 682
 683     if (libssh2_channel_shell(pwm->tcp_conn->channel)) {
 684         rc = GPG_ERR_ASSUAN_SERVER_FAULT;
 685         goto fail;
 686     }
 687
 688     assuan_set_io_hooks(&io_hooks);
 689     rc = assuan_socket_connect_fd(&ctx, pwm->tcp_conn->fd, 0, pwm);
 690
 691     if (rc)
 692         goto fail;
 693
 694     assuan_set_finish_handler(ctx, _ssh_assuan_deinit);
 695     pwm->ctx = ctx;
 696     return _socket_connect_finalize(pwm);
 697
 698 fail:
 699     free_tcp_conn(pwm->tcp_conn);
 700     pwm->tcp_conn = NULL;
 701     return rc;
 702 }
 703
 704 static gpg_error_t _do_pwmd_tcp_connect(pwm_t *pwm, const char *host, int port,
 705         const char *identity, const char *user, const char *known_hosts, int get)
 706 {
 707     pwmd_tcp_conn_t *conn;
 708     gpg_error_t rc;
 709
 710     rc = init_tcp_conn(&conn, host, port, identity, user, known_hosts, get);
 711
 712     if (rc)
 713         return rc;
 714
 715     pwm->tcp_conn = conn;
 716     pwm->tcp_conn->get_only = get;
 717     pwm->cmd = ASYNC_CMD_DNS;
 718     ares_init(&pwm->tcp_conn->chan);
 719     ares_query(pwm->tcp_conn->chan, pwm->tcp_conn->host, ns_c_any, ns_t_any,
 720             dns_resolve_cb, pwm);
 721
 722     /* dns_resolve_cb() may have already been called. */
 723     if (pwm->tcp_conn->rc) {
 724         rc = pwm->tcp_conn->rc;
 725         goto fail;
 726     }
 727
 728     /*
 729      * Fake a blocking DNS lookup. libcares does a better job than
 730      * getaddrinfo().
 731      */
 732     do {
 733         fd_set rfds, wfds;
 734         int n;
 735         struct timeval tv;
 736
 737         FD_ZERO(&rfds);
 738         FD_ZERO(&wfds);
 739         n = ares_fds(pwm->tcp_conn->chan, &rfds, &wfds);
 740         ares_timeout(pwm->tcp_conn->chan, NULL, &tv);
 741 #ifdef WITH_LIBPTH
 742         n = pth_select(n, &rfds, &wfds, NULL, &tv);
 743 #else
 744         n = select(n, &rfds, &wfds, NULL, &tv);
 745 #endif
 746
 747         if (n == -1) {
 748             rc = gpg_error_from_syserror();
 749             goto fail;
 750         }
 751         else if (n == 0) {
 752             rc = GPG_ERR_TIMEOUT;
 753             goto fail;
 754         }
 755
 756         ares_process(pwm->tcp_conn->chan, &rfds, &wfds);
 757
 758         if (pwm->tcp_conn->rc)
 759             break;
 760     } while (pwm->cmd == ASYNC_CMD_DNS);
 761
 762     if (pwm->tcp_conn->rc) {
 763         rc = pwm->tcp_conn->rc;
 764         goto fail;
 765     }
 766
 767     return setup_tcp_session(pwm);
 768
 769 fail:
 770     return rc;
 771 }
 772
 773 gpg_error_t pwmd_ssh_connect(pwm_t *pwm, const char *host, int port,
 774         const char *identity, const char *user, const char *known_hosts)
 775 {
 776     return _do_pwmd_tcp_connect(pwm, host, port, identity, user, known_hosts, 0);
 777 }
 778
 779 gpg_error_t pwmd_get_hostkey(const char *host, int port, char **result)
 780 {
 781     char *hostkey;
 782     pwm_t *pwm = pwmd_new(NULL);
 783     gpg_error_t rc;
 784
 785     if (!pwm)
 786         return gpg_error_from_errno(ENOMEM);
 787
 788     rc = _do_pwmd_tcp_connect(pwm, host, port, NULL, NULL, NULL, 1);
 789
 790     if (rc) {
 791         pwmd_close(pwm);
 792         return rc;
 793     }
 794
 795     hostkey = pwmd_strdup(pwm->tcp_conn->hostkey);
 796
 797     if (!hostkey)
 798         rc = gpg_error_from_errno(ENOMEM);
 799
 800     pwmd_close(pwm);
 801     *result = hostkey;
 802     return rc;
 803 }
 804
 805 gpg_error_t pwmd_get_hostkey_async(pwm_t *pwm, const char *host, int port)
 806 {
 807     return _do_pwmd_tcp_connect_async(pwm, host, port, NULL, NULL, NULL,
 808             ASYNC_CMD_HOSTKEY);
 809 }
 810 #endif
 811
 812 gpg_error_t pwmd_connect(pwm_t *pwm, const char *path)
 813 {
 814     char *socketpath = NULL;
 815     assuan_context_t ctx;
 816     struct passwd pw;
 817     char *pwbuf = _getpwuid(&pw);
 818     gpg_error_t rc;
 819
 820     if (!pwbuf)
 821         return gpg_error_from_errno(errno);
 822
 823     if (!path) {
 824         socketpath = (char *)pwmd_malloc(strlen(pw.pw_dir) + strlen("/.pwmd/socket") + 1);
 825         sprintf(socketpath, "%s/.pwmd/socket", pw.pw_dir);
 826     }
 827     else
 828         socketpath = pwmd_strdup(path);
 829
 830     pwmd_free(pwbuf);
 831     rc = assuan_socket_connect_ext(&ctx, socketpath, -1, 0);
 832     pwmd_free(socketpath);
 833
 834     if (rc)
 835         return rc;
 836
 837     pwm->ctx = ctx;
 838     return _socket_connect_finalize(pwm);
 839 }
 840
 841 void pwmd_close(pwm_t *pwm)
 842 {
 843     if (!pwm)
 844         return;
 845
 846     if (pwm->ctx)
 847         assuan_disconnect(pwm->ctx);
 848
 849     if (pwm->password)
 850         pwmd_free(pwm->password);
 851
 852     if (pwm->title)
 853         pwmd_free(pwm->title);
 854
 855     if (pwm->desc)
 856         pwmd_free(pwm->desc);
 857
 858     if (pwm->prompt)
 859         pwmd_free(pwm->prompt);
 860
 861     if (pwm->pinentry_tty)
 862         pwmd_free(pwm->pinentry_tty);
 863
 864     if (pwm->pinentry_display)
 865         pwmd_free(pwm->pinentry_display);
 866
 867     if (pwm->pinentry_term)
 868         pwmd_free(pwm->pinentry_term);
 869
 870     if (pwm->lcctype)
 871         pwmd_free(pwm->lcctype);
 872
 873     if (pwm->lcmessages)
 874         pwmd_free(pwm->lcmessages);
 875
 876     if (pwm->filename)
 877         pwmd_free(pwm->filename);
 878
 879     if (pwm->name)
 880         pwmd_free(pwm->name);
 881
 882 #ifdef WITH_TCP
 883     if (pwm->tcp_conn)
 884         free_tcp_conn(pwm->tcp_conn);
 885 #endif
 886
 887     pwmd_free(pwm);
 888 }
 889
 890 static int mem_realloc_cb(void *data, const void *buffer, size_t len)
 891 {
 892     membuf_t *mem = (membuf_t *)data;
 893     void *p;
 894
 895     if (!buffer)
 896         return 0;
 897
 898     if ((p = pwmd_realloc(mem->buf, mem->len + len)) == NULL)
 899         return 1;
 900
 901     mem->buf = p;
 902     memcpy((char *)mem->buf + mem->len, buffer, len);
 903     mem->len += len;
 904     return 0;
 905 }
 906
 907 static int _inquire_cb(void *data, const char *keyword)
 908 {
 909     pwm_t *pwm = (pwm_t *)data;
 910     gpg_error_t rc = 0;
 911     int flags = fcntl(pwm->fd, F_GETFL);
 912
 913     /* Shouldn't get this far without a callback. */
 914     if (!pwm->inquire_func)
 915         return GPG_ERR_INV_ARG;
 916
 917     /*
 918      * Since the socket file descriptor is probably set to non-blocking, set to
 919      * blocking to prevent GPG_ERR_EAGAIN errors. This should be fixed when
 920      * asynchronous INQUIRE is supported by either libassuan or a later
 921      * libpwmd.
 922      */
 923     fcntl(pwm->fd, F_SETFL, 0);
 924
 925     for (;;) {
 926         char *result = NULL;
 927         size_t len;
 928         gpg_error_t arc;
 929
 930         rc = pwm->inquire_func(pwm->inquire_data, keyword, rc, &result, &len);
 931         rc = gpg_err_code(rc);
 932
 933         if (rc == GPG_ERR_EOF || !rc) {
 934             if (len <= 0 || !result) {
 935                 rc = 0;
 936                 break;
 937             }
 938
 939             arc = assuan_send_data(pwm->ctx, result, len);
 940
 941             if (rc == GPG_ERR_EOF) {
 942                 rc = arc;
 943                 break;
 944             }
 945
 946             rc = arc;
 947         }
 948         else if (rc)
 949             break;
 950     }
 951
 952     fcntl(pwm->fd, F_SETFL, flags);
 953     return rc;
 954 }
 955
 956 static gpg_error_t do_nb_command(pwm_t *pwm, const char *cmd, ...)
 957 {
 958     char *buf;
 959     gpg_error_t rc;
 960     va_list ap;
 961
 962     if (pwm->state == ASYNC_DONE)
 963         pwm->state = ASYNC_INIT;
 964
 965     if (pwm->state != ASYNC_INIT)
 966         return GPG_ERR_INV_STATE;
 967
 968     buf = pwmd_malloc(ASSUAN_LINELENGTH+1);
 969
 970     if (!buf)
 971         return gpg_error_from_errno(ENOMEM);
 972
 973     va_start(ap, cmd);
 974     vsnprintf(buf, ASSUAN_LINELENGTH, cmd, ap);
 975     va_end(ap);
 976     rc = assuan_write_line(pwm->ctx, buf);
 977     pwmd_free(buf);
 978
 979     if (!rc)
 980         pwm->state = ASYNC_PROCESS;
 981
 982     return rc;
 983 }
 984
 985 gpg_error_t pwmd_open_async(pwm_t *pwm, const char *filename)
 986 {
 987     if (!pwm || !filename)
 988         return GPG_ERR_INV_ARG;
 989
 990     if (pwm->cmd != ASYNC_CMD_OPEN) {
 991         pwm->pin_try = 0;
 992
 993         if (pwm->filename)
 994             pwmd_free(pwm->filename);
 995
 996         pwm->filename = pwmd_strdup(filename);
 997     }
 998
 999     pwm->cmd = ASYNC_CMD_OPEN;
1000     return do_nb_command(pwm, "OPEN %s %s", filename,
1001             pwm->password ? pwm->password : "");
1002 }
1003
1004 gpg_error_t pwmd_save_async(pwm_t *pwm)
1005 {
1006     if (!pwm)
1007         return GPG_ERR_INV_ARG;
1008
1009     pwm->cmd = ASYNC_CMD_SAVE;
1010     return do_nb_command(pwm, "SAVE %s", pwm->password ? pwm->password : "");
1011 }
1012
1013 static gpg_error_t parse_assuan_line(pwm_t *pwm)
1014 {
1015     gpg_error_t rc;
1016     char *line;
1017     size_t len;
1018
1019     rc = assuan_read_line(pwm->ctx, &line, &len);
1020
1021     if (!rc) {
1022         if (line[0] == 'O' && line[1] == 'K' &&
1023                 (line[2] == 0 || line[2] == ' ')) {
1024             pwm->state = ASYNC_DONE;
1025         }
1026         else if (line[0] == '#') {
1027         }
1028         else if (line[0] == 'S' && (line[1] == 0 || line[1] == ' ')) {
1029             if (pwm->status_func) {
1030                 pwm->status_func(pwm->status_data,
1031                         line[1] == 0 ? line+1 : line+2);
1032             }
1033         }
1034         else if (line[0] == 'E' && line[1] == 'R' && line[2] == 'R' &&
1035                 (line[3] == 0 || line[3] == ' ')) {
1036             line += 4;
1037             rc = atoi(line);
1038             pwm->state = ASYNC_DONE;
1039         }
1040     }
1041
1042     return rc;
1043 }
1044
1045 gpg_error_t pwmd_pending_line(pwm_t *pwm)
1046 {
1047     if (!pwm)
1048         return GPG_ERR_INV_ARG;
1049
1050     if (!pwm->ctx)
1051         return GPG_ERR_INV_STATE;
1052
1053     return assuan_pending_line(pwm->ctx) ? 0 : GPG_ERR_NO_DATA;
1054 }
1055
1056 static pwmd_async_t reset_async(pwm_t *pwm, int done)
1057 {
1058     pwm->state = ASYNC_INIT;
1059     pwm->cmd = ASYNC_CMD_NONE;
1060
1061 #ifdef WITH_PINENTRY
1062     if (pwm->nb_fd != -1) {
1063         close(pwm->nb_fd);
1064         pwm->nb_fd = -1;
1065     }
1066 #endif
1067 #ifdef WITH_TCP
1068     if (done && pwm->tcp_conn && pwm->tcp_conn->fd != -1) {
1069         close(pwm->tcp_conn->fd);
1070         pwm->tcp_conn->fd = -1;
1071     }
1072 #endif
1073
1074     return ASYNC_DONE;
1075 };
1076
1077 pwmd_async_t pwmd_process(pwm_t *pwm, gpg_error_t *rc, char **result)
1078 {
1079     fd_set fds;
1080     int n;
1081     struct timeval tv = {0, 0};
1082
1083     *rc = 0;
1084
1085     if (!pwm) {
1086         *rc = GPG_ERR_INV_ARG;
1087         return ASYNC_DONE;
1088     }
1089
1090     /* When not in a command, this will let libassuan process status messages
1091      * by calling PWMD_OPTION_STATUS_FUNC. The client can poll the file
1092      * descriptor returned by pwmd_get_fd() to determine when this should be
1093      * called or call pwmd_pending_line() to determine whether a buffered line
1094      * needs to be processed. */
1095     if (pwm->cmd == ASYNC_CMD_NONE) {
1096         *rc = assuan_command(pwm, pwm->ctx, NULL, "NOP");
1097         return pwm->state;
1098     }
1099
1100     /* Fixes pwmd_open/save_async2() when there is a cached or new file. */
1101     if (pwm->state == ASYNC_DONE) {
1102         reset_async(pwm, 0);
1103         return ASYNC_DONE;
1104     }
1105
1106     if (pwm->state != ASYNC_PROCESS) {
1107         *rc = GPG_ERR_INV_STATE;
1108         return ASYNC_DONE;
1109     }
1110
1111 #ifdef WITH_TCP
1112     if (pwm->cmd == ASYNC_CMD_DNS) {
1113         fd_set rfds, wfds;
1114
1115         if (pwm->tcp_conn->rc) {
1116             *rc = pwm->tcp_conn->rc;
1117             reset_async(pwm, 1);
1118             return ASYNC_DONE;
1119         }
1120
1121         FD_ZERO(&rfds);
1122         FD_ZERO(&wfds);
1123         n = ares_fds(pwm->tcp_conn->chan, &rfds, &wfds);
1124
1125         /* Shouldn't happen. */
1126         if (!n)
1127             return pwm->state;
1128
1129 #ifdef WITH_LIBPTH
1130         n = pth_select(n, &rfds, &wfds, NULL, &tv);
1131 #else
1132         n = select(n, &rfds, &wfds, NULL, &tv);
1133 #endif
1134
1135         if (n > 0)
1136             ares_process(pwm->tcp_conn->chan, &rfds, &wfds);
1137
1138         return pwm->state;
1139     }
1140     else if (pwm->cmd == ASYNC_CMD_CONNECT) {
1141         if (pwm->tcp_conn->rc == GPG_ERR_EINPROGRESS) {
1142             int ret;
1143             socklen_t len = sizeof(int);
1144
1145             FD_ZERO(&fds);
1146             FD_SET(pwm->tcp_conn->fd, &fds);
1147 #ifdef WITH_LIBPTH
1148             n = pth_select(pwm->tcp_conn->fd+1, NULL, &fds, NULL, &tv);
1149 #else
1150             n = select(pwm->tcp_conn->fd+1, NULL, &fds, NULL, &tv);
1151 #endif
1152
1153             if (!n || !FD_ISSET(pwm->tcp_conn->fd, &fds))
1154                 return pwm->state;
1155             else if (n == -1) {
1156                 *rc = gpg_error_from_syserror();
1157                 reset_async(pwm, 1);
1158                 return ASYNC_DONE;
1159             }
1160
1161             ret = getsockopt(pwm->tcp_conn->fd, SOL_SOCKET, SO_ERROR, &n, &len);
1162
1163             if (ret || n) {
1164                 *rc = ret ? gpg_error_from_syserror() : gpg_error_from_errno(n);
1165                 reset_async(pwm, 1);
1166                 return ASYNC_DONE;
1167             }
1168         }
1169         else if (pwm->tcp_conn->rc) {
1170             *rc = pwm->tcp_conn->rc;
1171             reset_async(pwm, 1);
1172             return ASYNC_DONE;
1173         }
1174
1175         fcntl(pwm->tcp_conn->fd, F_SETFL, 0);
1176         *rc = setup_tcp_session(pwm);
1177
1178         if (!*rc) {
1179             switch (pwm->tcp_conn->cmd) {
1180                 case ASYNC_CMD_HOSTKEY:
1181                     if (!*rc)
1182                         *result = pwm->result;
1183                     break;
1184                 default:
1185                     break;
1186             }
1187         }
1188
1189         return reset_async(pwm, *rc ? 1 : 0);
1190     }
1191 #endif
1192
1193 #ifdef WITH_PINENTRY
1194     if (pwm->cmd == ASYNC_CMD_OPEN2 || pwm->cmd == ASYNC_CMD_SAVE2) {
1195         int status;
1196
1197         if (pwm->nb_fd == -1) {
1198             *rc = GPG_ERR_INV_STATE;
1199             return reset_async(pwm, 0);
1200         }
1201
1202         FD_ZERO(&fds);
1203         FD_SET(pwm->nb_fd, &fds);
1204 #ifdef WITH_LIBPTH
1205         n = pth_select(pwm->nb_fd+1, &fds, NULL, NULL, &tv);
1206 #else
1207         n = select(pwm->nb_fd+1, &fds, NULL, NULL, &tv);
1208 #endif
1209         if (n == -1) {
1210             *rc = gpg_error_from_syserror();
1211             return reset_async(pwm, 0);
1212         }
1213
1214         if (n > 0) {
1215             pwmd_nb_status_t nb;
1216 #ifdef WITH_LIBPTH
1217             size_t len = pth_read(pwm->nb_fd, &nb, sizeof(nb));
1218 #else
1219             size_t len = read(pwm->nb_fd, &nb, sizeof(nb));
1220 #endif
1221             waitpid(pwm->nb_pid, &status, WNOHANG);
1222
1223             if (len != sizeof(nb)) {
1224                 *rc = gpg_error_from_syserror();
1225                 return reset_async(pwm, pwm->cmd == ASYNC_CMD_OPEN2 ? 1 : 0);
1226             }
1227
1228             *rc = nb.error;
1229
1230             if (*rc == GPG_ERR_INV_PASSPHRASE && pwm->cmd == ASYNC_CMD_SAVE2) {
1231                 reset_async(pwm, 0);
1232                 *rc = pwmd_save_async2(pwm);
1233                 return ASYNC_PROCESS;
1234             }
1235             else if (*rc)
1236                 return reset_async(pwm, pwm->cmd == ASYNC_CMD_OPEN2 ? 1 : 0);
1237
1238             if (pwm->cmd == ASYNC_CMD_SAVE2) {
1239                 *rc = do_save_command(pwm, nb.password);
1240                 memset(&nb, 0, sizeof(pwmd_nb_status_t));
1241                 return reset_async(pwm, 0);
1242             }
1243
1244             if (pwm->cmd == ASYNC_CMD_OPEN2) {
1245                 *rc = do_open_command(pwm, pwm->filename, nb.password);
1246                 memset(&nb, 0, sizeof(pwmd_nb_status_t));
1247
1248                 if (*rc == GPG_ERR_INV_PASSPHRASE) {
1249                     if (++pwm->pin_try < pwm->pinentry_tries) {
1250                         int n = pwm->pin_try;
1251
1252                         reset_async(pwm, 0);
1253                         pwm->pin_try = n;
1254                         pwm->cmd = ASYNC_CMD_OPEN2;
1255                         *rc = pwmd_open_async2(pwm, pwm->filename);
1256
1257                         if (*rc)
1258                             return reset_async(pwm, 1);
1259
1260                         return pwm->state;
1261                     }
1262                 }
1263
1264                 return reset_async(pwm, *rc ? 1 : 0);
1265             }
1266         }
1267
1268         return pwm->state;
1269     }
1270 #endif
1271
1272     if (pwm->fd < 0) {
1273         *rc = GPG_ERR_INV_STATE;
1274         return reset_async(pwm, 0);
1275     }
1276
1277     /* This is for the non-blocking OPEN and SAVE commands. */
1278     FD_ZERO(&fds);
1279     FD_SET(pwm->fd, &fds);
1280 #ifdef WITH_LIBPTH
1281     n = pth_select(pwm->fd+1, &fds, NULL, NULL, &tv);
1282 #else
1283     n = select(pwm->fd+1, &fds, NULL, NULL, &tv);
1284 #endif
1285
1286     if (n == -1) {
1287         *rc = gpg_error_from_syserror();
1288         return reset_async(pwm, 0);
1289     }
1290
1291     if (n > 0) {
1292         if (FD_ISSET(pwm->fd, &fds))
1293             *rc = parse_assuan_line(pwm);
1294     }
1295
1296     while (!*rc && assuan_pending_line(pwm->ctx))
1297         *rc = parse_assuan_line(pwm);
1298
1299     /* For pinentry retries. */
1300     if (pwm->cmd == ASYNC_CMD_OPEN &&
1301             gpg_err_code(*rc) == GPG_ERR_INV_PASSPHRASE &&
1302             ++pwm->pin_try < pwm->pinentry_tries) {
1303         pwm->state = ASYNC_INIT;
1304         *rc = pwmd_open_async(pwm, pwm->filename);
1305     }
1306
1307     if (*rc)
1308         return reset_async(pwm, pwm->cmd == ASYNC_CMD_OPEN ? 1 : 0);
1309
1310     if (pwm->state == ASYNC_DONE) {
1311         reset_async(pwm, 0);
1312         return ASYNC_DONE;
1313     }
1314
1315     return pwm->state;
1316 }
1317
1318 static gpg_error_t assuan_command(pwm_t *pwm, assuan_context_t ctx,
1319         char **result, const char *cmd)
1320 {
1321     membuf_t data;
1322     gpg_error_t rc;
1323
1324     data.len = 0;
1325     data.buf = NULL;
1326
1327     rc = assuan_transact(ctx, cmd, mem_realloc_cb, &data, _inquire_cb, pwm,
1328             pwm->status_func, pwm->status_data);
1329
1330     if (rc) {
1331         if (data.buf) {
1332             pwmd_free(data.buf);
1333             data.buf = NULL;
1334         }
1335     }
1336     else {
1337         if (data.buf) {
1338             mem_realloc_cb(&data, "", 1);
1339
1340             if (!result) {
1341                 pwmd_free(data.buf);
1342                 rc = GPG_ERR_INV_ARG;
1343             }
1344             else
1345                 *result = (char *)data.buf;
1346         }
1347     }
1348
1349     return gpg_err_code(rc);
1350 }
1351
1352 gpg_error_t pwmd_inquire(pwm_t *pwm, const char *cmd, pwmd_inquire_cb_t fn,
1353         void *data)
1354 {
1355     if (!pwm || !cmd || !fn)
1356         return GPG_ERR_INV_ARG;
1357
1358     pwm->inquire_func = fn;
1359     pwm->inquire_data = data;
1360     return assuan_command(pwm, pwm->ctx, NULL, cmd);
1361 }
1362
1363 static gpg_error_t terminate_pinentry(pwm_t *pwm)
1364 {
1365 #ifndef WITH_PINENTRY
1366     return GPG_ERR_NOT_IMPLEMENTED;
1367 #else
1368     pid_t pid = pwm->pid;
1369
1370     pwm->pid = -1;
1371
1372     if (!pwm || pid == -1)
1373         return GPG_ERR_INV_ARG;
1374
1375     if (kill(pid, 0) == 0) {
1376         if (kill(pid, SIGTERM) == -1) {
1377             if (kill(pid, SIGKILL) == -1)
1378                 return gpg_error_from_errno(errno);
1379         }
1380     }
1381     else
1382         return gpg_error_from_errno(errno);
1383
1384     return 0;
1385 #endif
1386 }
1387
1388 #ifdef WITH_PINENTRY
1389 static gpg_error_t set_pinentry_strings(pwm_t *pwm, int which)
1390 {
1391     char *tmp;
1392     gpg_error_t error;
1393
1394     tmp = pwmd_malloc(ASSUAN_LINELENGTH+1);
1395
1396     if (!tmp)
1397         return gpg_error_from_errno(ENOMEM);
1398
1399     if (!pwm->title)
1400         pwm->title = pwmd_strdup(N_("LibPWMD"));
1401
1402     if (!pwm->title)
1403         goto fail_no_mem;
1404
1405     if (!pwm->prompt)
1406         pwm->prompt = pwmd_strdup(N_("Passphrase:"));
1407
1408     if (!pwm->prompt)
1409         goto fail_no_mem;
1410
1411     if (!pwm->desc && !which) {
1412         pwm->desc = pwmd_strdup(N_("Enter a passphrase."));
1413
1414         if (!pwm->desc)
1415             goto fail_no_mem;
1416     }
1417
1418     if (which == 1)
1419         snprintf(tmp, ASSUAN_LINELENGTH, "SETERROR %s",
1420                 N_("Invalid passphrase, please try again."));
1421     else if (which == 2)
1422         snprintf(tmp, ASSUAN_LINELENGTH, "SETERROR %s",
1423                 N_("Please type the passphrase again for confirmation."));
1424     else
1425         snprintf(tmp, ASSUAN_LINELENGTH, "SETERROR %s", pwm->desc);
1426
1427     error = pinentry_command(pwm, NULL, tmp);
1428
1429     if (error) {
1430         pwmd_free(tmp);
1431         return error;
1432     }
1433
1434     snprintf(tmp, ASSUAN_LINELENGTH, "SETPROMPT %s", pwm->prompt);
1435     error = pinentry_command(pwm, NULL, tmp);
1436
1437     if (error) {
1438         pwmd_free(tmp);
1439         return error;
1440     }
1441
1442     snprintf(tmp, ASSUAN_LINELENGTH, "SETDESC %s", pwm->title);
1443     error = pinentry_command(pwm, NULL, tmp);
1444     pwmd_free(tmp);
1445     return error;
1446
1447 fail_no_mem:
1448     pwmd_free(tmp);
1449     return gpg_error_from_errno(ENOMEM);
1450 }
1451
1452 static void update_pinentry_settings(pwm_t *pwm)
1453 {
1454     FILE *fp;
1455     char buf[LINE_MAX];
1456     char *p;
1457     struct passwd pw;
1458     char *pwbuf = _getpwuid(&pw);
1459
1460     if (!pwbuf)
1461         return;
1462
1463     snprintf(buf, sizeof(buf), "%s/.pwmd/pinentry.conf", pw.pw_dir);
1464     pwmd_free(pwbuf);
1465
1466     if ((fp = fopen(buf, "r")) == NULL)
1467         return;
1468
1469     while ((p = fgets(buf, sizeof(buf), fp)) != NULL) {
1470         char name[32], val[256];
1471
1472         if (sscanf(p, " %31[a-zA-Z] = %255s", name, val) != 2)
1473             continue;
1474
1475         if (strcasecmp(name, "TTYNAME") == 0) {
1476             pwmd_free(pwm->pinentry_tty);
1477             pwm->pinentry_tty = pwmd_strdup(val);
1478         }
1479         else if (strcasecmp(name, "TTYTYPE") == 0) {
1480             pwmd_free(pwm->pinentry_term);
1481             pwm->pinentry_term = pwmd_strdup(val);
1482         }
1483         else if (strcasecmp(name, "DISPLAY") == 0) {
1484             pwmd_free(pwm->pinentry_display);
1485             pwm->pinentry_display = pwmd_strdup(val);
1486         }
1487         else if (strcasecmp(name, "PATH") == 0) {
1488             pwmd_free(pwm->pinentry_path);
1489             pwm->pinentry_path = pwmd_strdup(val);
1490         }
1491     }
1492
1493     fclose(fp);
1494 }
1495
1496 static gpg_error_t launch_pinentry(pwm_t *pwm)
1497 {
1498     int rc;
1499     assuan_context_t ctx;
1500     int child_list[] = {-1};
1501     char *display = getenv("DISPLAY");
1502     const char *argv[10];
1503     const char **p = argv;
1504     int have_display = 0;
1505     char *tty = NULL;
1506     char *ttybuf = NULL;
1507
1508     update_pinentry_settings(pwm);
1509
1510     if (pwm->pinentry_display || display)
1511         have_display = 1;
1512     else {
1513         if (!pwm->pinentry_tty) {
1514             ttybuf = pwmd_malloc(255);
1515
1516             if (!ttybuf)
1517                 return gpg_error_from_errno(ENOMEM);
1518
1519             rc = ttyname_r(STDOUT_FILENO, ttybuf, 255);
1520
1521             if (rc) {
1522                 pwmd_free(ttybuf);
1523                 return gpg_error_from_errno(rc);
1524             }
1525
1526             tty = ttybuf;
1527         }
1528         else
1529             tty = pwm->pinentry_tty;
1530     }
1531
1532     if (!have_display && !tty)
1533         return GPG_ERR_ENOTTY;
1534
1535     *p++ = "pinentry";
1536     *p++ = have_display ? "--display" : "--ttyname";
1537     *p++ = have_display ? pwm->pinentry_display ? pwm->pinentry_display : display : tty;
1538
1539     if (pwm->lcctype) {
1540         *p++ = "--lc-ctype";
1541         *p++ = pwm->lcctype;
1542     }
1543
1544     if (pwm->lcmessages) {
1545         *p++ = "--lc-messages";
1546         *p++ = pwm->lcmessages;
1547     }
1548
1549     *p = NULL;
1550
1551     if (!have_display) {
1552         *p++ = "--ttytype";
1553         *p++ = pwm->pinentry_term ? pwm->pinentry_term : getenv("TERM");
1554         *p = NULL;
1555     }
1556
1557     rc = assuan_pipe_connect(&ctx, pwm->pinentry_path ? pwm->pinentry_path : PINENTRY_PATH, argv, child_list);
1558
1559     if (ttybuf)
1560         pwmd_free(ttybuf);
1561
1562     if (rc)
1563         return rc;
1564
1565     pwm->pid = assuan_get_pid(ctx);
1566     pwm->pctx = ctx;
1567     return set_pinentry_strings(pwm, 0);
1568 }
1569
1570 static gpg_error_t pinentry_command(pwm_t *pwm, char **result, const char *cmd)
1571 {
1572     gpg_error_t n;
1573
1574     if (!pwm->pctx) {
1575         n = launch_pinentry(pwm);
1576
1577         if (n)
1578             return n;
1579     }
1580
1581     return assuan_command(pwm, pwm->pctx, result, cmd);
1582 }
1583
1584 static void pinentry_disconnect(pwm_t *pwm)
1585 {
1586     if (pwm->pctx)
1587         assuan_disconnect(pwm->pctx);
1588
1589     pwm->pctx = NULL;
1590     pwm->pid = -1;
1591 }
1592
1593 /*
1594  * Only called from a child process.
1595  */
1596 static void catchsig(int sig)
1597 {
1598     switch (sig) {
1599         case SIGALRM:
1600             if (gelapsed++ >= gtimeout)
1601                 terminate_pinentry(gpwm);
1602             else
1603                 alarm(1);
1604             break;
1605         default:
1606             break;
1607     }
1608 }
1609 #endif
1610
1611 /*
1612  * Borrowed from libassuan.
1613  */
1614 static char *percent_escape(const char *atext)
1615 {
1616     const unsigned char *s;
1617     int len = strlen(atext) * 3 + 1;
1618     char *buf = (char *)pwmd_malloc(len), *p = buf;
1619
1620     if (!buf)
1621         return NULL;
1622
1623     for (s=(const unsigned char *)atext; *s; s++) {
1624         if (*s < ' ') {
1625             sprintf (p, "%%%02X", *s);
1626             p += 3;
1627         }
1628         else
1629             *p++ = *s;
1630     }
1631
1632     *p = 0;
1633     return buf;
1634 }
1635
1636 static gpg_error_t send_command(pwm_t *pwm, char **result, const char *cmd)
1637 {
1638     if (!cmd)
1639         return GPG_ERR_INV_ARG;
1640
1641     return assuan_command(pwm, pwm->ctx, result, cmd);
1642 }
1643
1644 gpg_error_t pwmd_command_ap(pwm_t *pwm, char **result, const char *cmd,
1645         va_list ap)
1646 {
1647     char *buf;
1648     size_t len;
1649     gpg_error_t error;
1650
1651     if (!pwm || !cmd)
1652         return GPG_ERR_INV_ARG;
1653
1654     /*
1655      * C99 allows the dst pointer to be null which will calculate the length
1656      * of the would-be result and return it.
1657      */
1658     len = vsnprintf(NULL, 0, cmd, ap)+1;
1659     buf = (char *)pwmd_malloc(len);
1660
1661     if (!buf)
1662         return gpg_error_from_errno(ENOMEM);
1663
1664     len = vsnprintf(buf, len, cmd, ap);
1665
1666     if (buf[strlen(buf)-1] == '\n')
1667         buf[strlen(buf)-1] = 0;
1668
1669     if (buf[strlen(buf)-1] == '\r')
1670         buf[strlen(buf)-1] = 0;
1671
1672     error = send_command(pwm, result, buf);
1673     pwmd_free(buf);
1674     return error;
1675 }
1676
1677 gpg_error_t pwmd_command(pwm_t *pwm, char **result, const char *cmd, ...)
1678 {
1679     va_list ap;
1680     gpg_error_t error;
1681
1682     if (!pwm || !cmd)
1683         return GPG_ERR_INV_ARG;
1684
1685     if (result)
1686         *result = NULL;
1687
1688     va_start(ap, cmd);
1689     error = pwmd_command_ap(pwm, result, cmd, ap);
1690     va_end(ap);
1691     return error;
1692 }
1693
1694 #ifdef WITH_PINENTRY
1695 static gpg_error_t do_getpin(pwm_t *pwm, char **result)
1696 {
1697     if (gtimeout) {
1698         signal(SIGALRM, catchsig);
1699         alarm(1);
1700     }
1701
1702     *result = NULL;
1703     return pinentry_command(pwm, result, "GETPIN");
1704 }
1705
1706 static gpg_error_t getpin(pwm_t *pwm, char **result, int which)
1707 {
1708     gpg_error_t error;
1709
1710     error = set_pinentry_strings(pwm, which);
1711
1712     if (error) {
1713         pinentry_disconnect(pwm);
1714         return error;
1715     }
1716
1717     error = do_getpin(pwm, result);
1718
1719     /*
1720      * Since there was input cancel any timeout setting.
1721      */
1722     alarm(0);
1723
1724     if (error) {
1725         if (error == GPG_ERR_CANCELED)
1726             return GPG_ERR_CANCELED;
1727
1728         if (pwm->pctx)
1729             pinentry_disconnect(pwm);
1730
1731         return error;
1732     }
1733
1734     return 0;
1735 }
1736 #endif
1737
1738 static gpg_error_t do_open_command(pwm_t *pwm, const char *filename, char *password)
1739 {
1740     char *buf;
1741     gpg_error_t error;
1742     char *result = NULL;
1743
1744     buf = pwmd_malloc(ASSUAN_LINELENGTH+1);
1745
1746     if (!buf)
1747         return gpg_error_from_errno(ENOMEM);
1748
1749     snprintf(buf, ASSUAN_LINELENGTH, "OPEN %s %s", filename,
1750             password ? password : "");
1751     error = send_command(pwm, &result, buf);
1752     pwmd_free(buf);
1753
1754     if (error && result)
1755         pwmd_free(result);
1756
1757     return error;
1758 }
1759
1760 static gpg_error_t do_pwmd_open(pwm_t *pwm, const char *filename, int nb)
1761 {
1762     char *result = NULL;
1763     char *password = NULL;
1764     char path[PATH_MAX];
1765 #ifdef WITH_PINENTRY
1766     int pin_try;
1767 #endif
1768     gpg_error_t rc;
1769
1770     if (!pwm || !filename || !*filename)
1771         return GPG_ERR_INV_ARG;
1772
1773 #ifdef WITH_PINENTRY
1774     pin_try = pwm->pinentry_tries - 1;
1775 #endif
1776
1777     /*
1778      * Avoid calling pinentry if the password is cached on the server or if
1779      * this is a new file.
1780      */
1781     rc = pwmd_command(pwm, &result, "GETCONFIG data_directory");
1782
1783     if (rc)
1784         return rc;
1785
1786     snprintf(path, sizeof(path), "%s/%s", result, filename);
1787     pwmd_free(result);
1788
1789     if (access(path, R_OK) == -1) {
1790         if (errno == ENOENT)
1791             goto gotpassword;
1792     }
1793
1794     rc = pwmd_command(pwm, &result, "ISCACHED %s", filename);
1795
1796     if (rc && rc != GPG_ERR_NOT_FOUND)
1797         return rc;
1798
1799     if (!nb && rc == GPG_ERR_NOT_FOUND) {
1800         if (pwm->password) {
1801             password = pwm->password;
1802             goto gotpassword;
1803         }
1804
1805         if (pwm->passfunc) {
1806             rc = pwm->passfunc(pwm->passdata, &password);
1807
1808             if (rc)
1809                 return rc;
1810
1811             goto gotpassword;
1812         }
1813     }
1814
1815 #ifdef WITH_PINENTRY
1816     if (rc == GPG_ERR_NOT_FOUND && pwm->use_pinentry) {
1817         /* Get the passphrase using the LOCAL pinentry. */
1818         if (nb) {
1819             int p[2];
1820             pid_t pid;
1821             pwmd_nb_status_t pw;
1822
1823             if (pipe(p) == -1)
1824                 return gpg_error_from_syserror();
1825
1826             if (!pwm->filename)
1827                 pwm->filename = pwmd_strdup(filename);
1828
1829             if (!pwm->filename)
1830                 return gpg_error_from_errno(ENOMEM);
1831
1832 #ifdef WITH_LIBPTH
1833             pid = pth_fork();
1834 #else
1835             pid = fork();
1836 #endif
1837
1838             switch (pid) {
1839                 case 0:
1840                     close(p[0]);
1841                     pw.fd = p[0];
1842
1843                     if (pwm->pinentry_timeout > 0) {
1844                         gpwm = pwm;
1845                         gtimeout = pwm->pinentry_timeout;
1846                         gelapsed = 0;
1847                     }
1848
1849                     pw.error = getpin(pwm, &password, 0);
1850
1851                     if (gtimeout && gelapsed >= gtimeout)
1852                         pw.error = GPG_ERR_TIMEOUT;
1853
1854                     signal(SIGALRM, SIG_DFL);
1855
1856                     if (!pw.error)
1857                         snprintf(pw.password, sizeof(pw.password), "%s",
1858                                 password);
1859
1860                     pinentry_disconnect(pwm);
1861 #ifdef WITH_LIBPTH
1862                     pth_write(p[1], &pw, sizeof(pw));
1863 #else
1864                     write(p[1], &pw, sizeof(pw));
1865 #endif
1866                     memset(&pw, 0, sizeof(pw));
1867                     close(p[1]);
1868                     _exit(0);
1869                     break;
1870                 case -1:
1871                     rc = gpg_error_from_syserror();
1872                     close(p[0]);
1873                     close(p[1]);
1874                     return rc;
1875                 default:
1876                     break;
1877             }
1878
1879             close(p[1]);
1880             pwm->nb_fd = p[0];
1881             pwm->nb_pid = pid;
1882             return 0;
1883         }
1884
1885         rc = getpin(pwm, &password, 0);
1886
1887         if (rc)
1888             return rc;
1889 #endif
1890     }
1891
1892 gotpassword:
1893     pwm->state = ASYNC_DONE;
1894     rc = do_open_command(pwm, filename, password);
1895
1896     /*
1897      * Keep the user defined password set with pwmd_setopt(). The password may
1898      * be needed later (pwmd_save()) depending on the pwmd file cache settings.
1899      */
1900     if (!pwm->passfunc && password && password != pwm->password)
1901         pwmd_free(password);
1902
1903     if (rc == GPG_ERR_INV_PASSPHRASE) {
1904         if (pin_try-- > 0 && !nb) {
1905
1906 #ifdef WITH_PINENTRY
1907             if (pwm->use_pinentry)
1908                 rc = getpin(pwm, &password, 1);
1909             else
1910 #endif
1911                 rc = pwmd_command(pwm, &result, "OPTION TITLE=%s",
1912                         N_("Invalid passphrase, please try again."));
1913
1914             if (rc)
1915                 return rc;
1916
1917             goto gotpassword;
1918         }
1919
1920 #ifdef WITH_PINENTRY
1921         if (nb)
1922             pinentry_disconnect(pwm);
1923 #endif
1924
1925         return rc;
1926     }
1927
1928     if (!rc) {
1929         if (pwm->filename)
1930             pwmd_free(pwm->filename);
1931
1932         pwm->filename = pwmd_strdup(filename);
1933     }
1934
1935     return rc;
1936 }
1937
1938 gpg_error_t pwmd_open(pwm_t *pwm, const char *filename)
1939 {
1940     return do_pwmd_open(pwm, filename, 0);
1941 }
1942
1943 gpg_error_t pwmd_open_async2(pwm_t *pwm, const char *filename)
1944 {
1945 #ifndef WITH_PINENTRY
1946     return GPG_ERR_NOT_IMPLEMENTED;
1947 #else
1948     gpg_error_t rc;
1949
1950     /* Must be set so pinentry retries will work properly. */
1951     if (!pwm->use_pinentry)
1952         return GPG_ERR_INV_STATE;
1953
1954     if (pwm->cmd != ASYNC_CMD_OPEN2)
1955         pwm->pin_try = 0;
1956
1957     pwm->cmd = ASYNC_CMD_OPEN2;
1958     pwm->state = ASYNC_PROCESS;
1959     rc = do_pwmd_open(pwm, filename, 1);
1960
1961     if (rc)
1962         reset_async(pwm, 1);
1963
1964     return rc;
1965 #endif
1966 }
1967
1968 #ifdef WITH_PINENTRY
1969 static gpg_error_t do_save_getpin(pwm_t *pwm, char **password)
1970 {
1971     int confirm = 0;
1972     gpg_error_t error;
1973     char *result = NULL;
1974
1975 again:
1976     error = getpin(pwm, &result, confirm ? 2 : 0);
1977
1978     if (error) {
1979         if (pwm->pctx)
1980             pinentry_disconnect(pwm);
1981
1982         if (*password)
1983             pwmd_free(*password);
1984
1985         return error;
1986     }
1987
1988     if (!confirm++) {
1989         *password = result;
1990         goto again;
1991     }
1992
1993     if (strcmp(*password, result)) {
1994         pwmd_free(*password);
1995         pwmd_free(result);
1996         pinentry_disconnect(pwm);
1997         error = GPG_ERR_INV_PASSPHRASE;
1998         return error;
1999     }
2000
2001     pwmd_free(result);
2002     pinentry_disconnect(pwm);
2003     return 0;
2004 }
2005 #endif
2006
2007 static gpg_error_t do_save_command(pwm_t *pwm, char *password)
2008 {
2009     char *buf;
2010     gpg_error_t error;
2011     char *result = NULL;
2012
2013     buf = pwmd_malloc(ASSUAN_LINELENGTH+1);
2014
2015     if (!buf)
2016         return gpg_error_from_errno(ENOMEM);
2017
2018     snprintf(buf, ASSUAN_LINELENGTH, "SAVE %s", password ? password : "");
2019     error = send_command(pwm, &result, buf);
2020     pwmd_free(buf);
2021
2022     if (error && result)
2023         pwmd_free(result);
2024
2025     return error;
2026 }
2027
2028 static gpg_error_t do_pwmd_save(pwm_t *pwm, int nb)
2029 {
2030     char *result = NULL;
2031     char *password = NULL;
2032     gpg_error_t rc;
2033
2034     if (!pwm)
2035         return GPG_ERR_INV_ARG;
2036
2037     rc = pwmd_command(pwm, &result, "ISCACHED %s", pwm->filename);
2038
2039     if (rc && rc != GPG_ERR_NOT_FOUND)
2040         return rc;
2041
2042     if (!nb && rc == GPG_ERR_NOT_FOUND) {
2043         if (pwm->password) {
2044             password = pwm->password;
2045             goto gotpassword;
2046         }
2047
2048         if (pwm->passfunc) {
2049             rc = pwm->passfunc(pwm->passdata, &password);
2050
2051             if (rc)
2052                 return rc;
2053
2054             goto gotpassword;
2055         }
2056     }
2057
2058     if (rc == GPG_ERR_NOT_FOUND && pwm->use_pinentry) {
2059 #ifdef WITH_PINENTRY
2060         /* Get the password using the LOCAL pinentry. */
2061         if (nb) {
2062             int p[2];
2063             pid_t pid;
2064             pwmd_nb_status_t pw;
2065
2066             if (pipe(p) == -1)
2067                 return gpg_error_from_syserror();
2068
2069 #ifdef WITH_LIBPTH
2070             pid = pth_fork();
2071 #else
2072             pid = fork();
2073 #endif
2074
2075             switch (pid) {
2076                 case 0:
2077                     close(p[0]);
2078                     pw.fd = p[0];
2079                     password = NULL;
2080                     pw.error = do_save_getpin(pwm, &password);
2081                     pinentry_disconnect(pwm);
2082                     snprintf(pw.password, sizeof(pw.password), "%s",
2083                             password);
2084 #ifdef WITH_LIBPTH
2085                     pth_write(p[1], &pw, sizeof(pw));
2086 #else
2087                     write(p[1], &pw, sizeof(pw));
2088 #endif
2089                     memset(&pw, 0, sizeof(pw));
2090                     close(p[1]);
2091                     _exit(0);
2092                     break;
2093                 case -1:
2094                     rc = gpg_error_from_syserror();
2095                     close(p[0]);
2096                     close(p[1]);
2097                     return rc;
2098                 default:
2099                     break;
2100             }
2101
2102             close(p[1]);
2103             pwm->nb_fd = p[0];
2104             pwm->nb_pid = pid;
2105             return 0;
2106         }
2107
2108         do {
2109             rc = do_save_getpin(pwm, &password);
2110         } while (rc == GPG_ERR_INV_PASSPHRASE);
2111
2112         if (rc)
2113             return rc;
2114     }
2115 #endif
2116     else
2117         pwm->state = ASYNC_DONE;
2118
2119 gotpassword:
2120     rc = do_save_command(pwm, password);
2121
2122     if (!pwm->passfunc && password && password != pwm->password)
2123         pwmd_free(password);
2124
2125     return rc;
2126 }
2127
2128 gpg_error_t pwmd_save_async2(pwm_t *pwm)
2129 {
2130 #ifndef WITH_PINENTRY
2131     return GPG_ERR_NOT_IMPLEMENTED;
2132 #else
2133     gpg_error_t rc;
2134
2135     /* Must be set so pinentry retries will work properly. */
2136     if (!pwm->use_pinentry)
2137         return GPG_ERR_INV_STATE;
2138
2139     pwm->cmd = ASYNC_CMD_SAVE2;
2140     pwm->state = ASYNC_PROCESS;
2141     rc = do_pwmd_save(pwm, 1);
2142
2143     if (rc)
2144         reset_async(pwm, 0);
2145
2146     return rc;
2147 #endif
2148 }
2149
2150 gpg_error_t pwmd_save(pwm_t *pwm)
2151 {
2152     return do_pwmd_save(pwm, 0);
2153 }
2154
2155 gpg_error_t pwmd_setopt(pwm_t *pwm, pwmd_option_t opt, ...)
2156 {
2157     va_list ap;
2158     int n = va_arg(ap, int);
2159     char *result;
2160     char *arg1;
2161     gpg_error_t error = 0;
2162
2163     if (!pwm)
2164         return GPG_ERR_INV_ARG;
2165
2166     va_start(ap, opt);
2167
2168     switch (opt) {
2169         case PWMD_OPTION_STATUS_CB:
2170             pwm->status_func = va_arg(ap, pwmd_status_cb_t);
2171             break;
2172         case PWMD_OPTION_STATUS_DATA:
2173             pwm->status_data = va_arg(ap, void *);
2174             break;
2175         case PWMD_OPTION_PASSPHRASE_CB:
2176             pwm->passfunc = va_arg(ap, pwmd_passphrase_cb_t);
2177             break;
2178         case PWMD_OPTION_PASSPHRASE_DATA:
2179             pwm->passdata = va_arg(ap, void *);
2180             break;
2181         case PWMD_OPTION_PASSPHRASE:
2182             arg1 = va_arg(ap, char *);
2183
2184             if (pwm->password)
2185                 pwmd_free(pwm->password);
2186
2187             pwm->password = pwmd_strdup(arg1);
2188             break;
2189         case PWMD_OPTION_PINENTRY:
2190             n = va_arg(ap, int);
2191
2192             if (n != 0 && n != 1) {
2193                 va_end(ap);
2194                 error = GPG_ERR_INV_VALUE;
2195             }
2196             else {
2197                 pwm->use_pinentry = n;
2198                 error = pwmd_command(pwm, &result, "OPTION PINENTRY=%i",
2199                         !pwm->use_pinentry);
2200             }
2201             break;
2202 #ifdef WITH_PINENTRY
2203         case PWMD_OPTION_PINENTRY_TRIES:
2204             n = va_arg(ap, int);
2205
2206             if (n <= 0) {
2207                 va_end(ap);
2208                 error = GPG_ERR_INV_VALUE;
2209             }
2210             else
2211                 pwm->pinentry_tries = n;
2212             break;
2213 #endif
2214         case PWMD_OPTION_PINENTRY_TIMEOUT:
2215             n = va_arg(ap, int);
2216
2217             if (n < 0) {
2218                 va_end(ap);
2219                 error = GPG_ERR_INV_VALUE;
2220             }
2221             else
2222                 pwm->pinentry_timeout = n;
2223
2224             if (!pwm->use_pinentry)
2225                 error = pwmd_command(pwm, &result, "OPTION TIMEOUT=%i",
2226                         pwm->pinentry_timeout);
2227             break;
2228         case PWMD_OPTION_PINENTRY_PATH:
2229             if (pwm->pinentry_path)
2230                 pwmd_free(pwm->pinentry_path);
2231
2232             pwm->pinentry_path = pwmd_strdup(va_arg(ap, char *));
2233
2234             if (!pwm->use_pinentry)
2235                 error = pwmd_command(pwm, &result, "OPTION PATH=%s",
2236                         pwm->pinentry_path);
2237             break;
2238         case PWMD_OPTION_PINENTRY_TTY:
2239             if (pwm->pinentry_tty)
2240                 pwmd_free(pwm->pinentry_tty);
2241
2242             pwm->pinentry_tty = pwmd_strdup(va_arg(ap, char *));
2243
2244             if (!pwm->use_pinentry)
2245                 error = pwmd_command(pwm, &result, "OPTION TTY=%s",
2246                         pwm->pinentry_tty);
2247             break;
2248         case PWMD_OPTION_PINENTRY_DISPLAY:
2249             if (pwm->pinentry_display)
2250                 pwmd_free(pwm->pinentry_display);
2251
2252             pwm->pinentry_display = pwmd_strdup(va_arg(ap, char *));
2253
2254             if (!pwm->use_pinentry)
2255                 error = pwmd_command(pwm, &result, "OPTION DISPLAY=%s",
2256                         pwm->pinentry_display);
2257             break;
2258         case PWMD_OPTION_PINENTRY_TERM:
2259             if (pwm->pinentry_term)
2260                 pwmd_free(pwm->pinentry_term);
2261
2262             pwm->pinentry_term = pwmd_strdup(va_arg(ap, char *));
2263
2264             if (!pwm->use_pinentry)
2265                 error = pwmd_command(pwm, &result, "OPTION TTYTYPE=%s",
2266                         pwm->pinentry_term);
2267             break;
2268         case PWMD_OPTION_PINENTRY_TITLE:
2269             if (pwm->title)
2270                 pwmd_free(pwm->title);
2271
2272             pwm->title = percent_escape(va_arg(ap, char *));
2273
2274             if (!pwm->use_pinentry)
2275                 error = pwmd_command(pwm, &result, "OPTION TITLE=%s",
2276                         pwm->title);
2277             break;
2278         case PWMD_OPTION_PINENTRY_PROMPT:
2279             if (pwm->prompt)
2280                 pwmd_free(pwm->prompt);
2281
2282             pwm->prompt = percent_escape(va_arg(ap, char *));
2283
2284             if (!pwm->use_pinentry)
2285                 error = pwmd_command(pwm, &result, "OPTION PROMPT=%s",
2286                         pwm->prompt);
2287             break;
2288         case PWMD_OPTION_PINENTRY_DESC:
2289             if (pwm->desc)
2290                 pwmd_free(pwm->desc);
2291
2292             pwm->desc = percent_escape(va_arg(ap, char *));
2293
2294             if (!pwm->use_pinentry)
2295                 error = pwmd_command(pwm, &result, "OPTION DESC=%s",
2296                         pwm->desc);
2297             break;
2298         case PWMD_OPTION_PINENTRY_LC_CTYPE:
2299             if (pwm->lcctype)
2300                 pwmd_free(pwm->lcctype);
2301
2302             pwm->lcctype = pwmd_strdup(va_arg(ap, char *));
2303
2304             if (!pwm->use_pinentry)
2305                 error = pwmd_command(pwm, &result, "OPTION LC_CTYPE=%s",
2306                         pwm->lcctype);
2307             break;
2308         case PWMD_OPTION_PINENTRY_LC_MESSAGES:
2309             if (pwm->lcmessages)
2310                 pwmd_free(pwm->lcmessages);
2311
2312             pwm->lcmessages = pwmd_strdup(va_arg(ap, char *));
2313
2314             if (!pwm->use_pinentry)
2315                 error = pwmd_command(pwm, &result, "OPTION LC_MESSAGES=%s",
2316                         pwm->lcmessages);
2317             break;
2318 #ifdef WITH_TCP
2319         case PWMD_OPTION_IP_VERSION:
2320             n = va_arg(ap, int);
2321
2322             switch (n) {
2323                 case PWMD_IP_ANY:
2324                 case PWMD_IPV4:
2325                 case PWMD_IPV6:
2326                     pwm->prot = n;
2327                     break;
2328                 default:
2329                     error = GPG_ERR_INV_VALUE;
2330                     break;
2331             }
2332
2333             va_end(ap);
2334             break;
2335 #endif
2336         default:
2337             error = GPG_ERR_NOT_IMPLEMENTED;
2338             break;
2339     }
2340
2341     va_end(ap);
2342     return error;
2343 }
2344
2345 gpg_error_t pwmd_get_fd(pwm_t *pwm, int *fd)
2346 {
2347     if (!pwm)
2348         return GPG_ERR_INV_ARG;
2349
2350     if (pwm->fd == -1)
2351         return GPG_ERR_INV_STATE;
2352
2353     *fd = pwm->fd;
2354     return 0;
2355 }
2356
2357 gpg_error_t pwmd_get_fd2(pwm_t *pwm, int *fd)
2358 {
2359 #ifndef WITH_PINENTRY
2360     return GPG_ERR_NOT_IMPLEMENTED;
2361 #else
2362     if (!pwm)
2363         return GPG_ERR_INV_ARG;
2364
2365     if (pwm->nb_fd == -1)
2366         return GPG_ERR_INV_STATE;
2367
2368     *fd = pwm->nb_fd;
2369     return 0;
2370 #endif
2371 }
2372
2373 pwm_t *pwmd_new(const char *name)
2374 {
2375     pwm_t *h = pwmd_calloc(1, sizeof(pwm_t));
2376
2377     if (!h)
2378         return NULL;
2379
2380     if (name) {
2381         h->name = pwmd_strdup(name);
2382
2383         if (!h->name) {
2384             pwmd_free(h);
2385             return NULL;
2386         }
2387     }
2388
2389     h->fd = -1;
2390 #ifdef WITH_PINENTRY
2391     h->nb_fd = -1;
2392     h->pinentry_timeout = 30;
2393 #endif
2394 #ifdef WITH_TCP
2395     h->prot = PWMD_IP_ANY;
2396 #endif
2397     return h;
2398 }
2399
2400 void pwmd_free(void *ptr)
2401 {
2402     xfree(ptr);
2403 }
2404
2405 void *pwmd_malloc(size_t size)
2406 {
2407     return xmalloc(size);
2408 }
2409
2410 void *pwmd_calloc(size_t nmemb, size_t size)
2411 {
2412     return xcalloc(nmemb, size);
2413 }
2414
2415 void *pwmd_realloc(void *ptr, size_t size)
2416 {
2417     return xrealloc(ptr, size);
2418 }
2419
2420 char *pwmd_strdup(const char *str)
2421 {
2422     return xstrdup(str);
2423 }