g10/call-agent.c

   1 /* call-agent.c - divert operations to the agent
   2  *      Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
   3  *
   4  * This file is part of GnuPG.
   5  *
   6  * GnuPG is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * GnuPG is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  19  */
  20
  21 #if 0  /* lety Emacs display a red warning */
  22 #error fixme: this shares a lof of code with the file in ../sm
  23 #endif
  24
  25 #include <config.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <errno.h>
  30 #include <unistd.h>
  31 #include <time.h>
  32 #include <assert.h>
  33 #ifdef HAVE_LOCALE_H
  34 #include <locale.h>
  35 #endif
  36 #include <assuan.h>
  37
  38 #include "gpg.h"
  39 #include "util.h"
  40 #include "membuf.h"
  41 #include "options.h"
  42 #include "i18n.h"
  43 #include "call-agent.h"
  44
  45 #ifndef DBG_ASSUAN
  46 # define DBG_ASSUAN 1
  47 #endif
  48
  49 static ASSUAN_CONTEXT agent_ctx = NULL;
  50 static int force_pipe_server = 1; /* FIXME: set this back to 0. */
  51
  52 struct cipher_parm_s {
  53   ASSUAN_CONTEXT ctx;
  54   const char *ciphertext;
  55   size_t ciphertextlen;
  56 };
  57
  58 struct genkey_parm_s {
  59   ASSUAN_CONTEXT ctx;
  60   const char *sexp;
  61   size_t sexplen;
  62 };
  63
  64
  65 \f
  66 /* Try to connect to the agent via socket or fork it off and work by
  67    pipes.  Handle the server's initial greeting */
  68 static int
  69 start_agent (void)
  70 {
  71   int rc = 0;
  72   char *infostr, *p;
  73   ASSUAN_CONTEXT ctx;
  74   char *dft_display = NULL;
  75   char *dft_ttyname = NULL;
  76   char *dft_ttytype = NULL;
  77   char *old_lc = NULL;
  78   char *dft_lc = NULL;
  79
  80   if (agent_ctx)
  81     return 0; /* fixme: We need a context for each thread or serialize
  82                  the access to the agent. */
  83
  84   infostr = force_pipe_server? NULL : getenv ("GPG_AGENT_INFO");
  85   if (!infostr || !*infostr)
  86     {
  87       const char *pgmname;
  88       const char *argv[3];
  89       int no_close_list[3];
  90       int i;
  91
  92       if (opt.verbose)
  93         log_info (_("no running gpg-agent - starting one\n"));
  94
  95       if (fflush (NULL))
  96         {
  97           gpg_error_t tmperr = gpg_error_from_errno (errno);
  98           log_error ("error flushing pending output: %s\n", strerror (errno));
  99           return tmperr;
 100         }
 101
 102       if (!opt.agent_program || !*opt.agent_program)
 103         opt.agent_program = GNUPG_DEFAULT_AGENT;
 104       if ( !(pgmname = strrchr (opt.agent_program, '/')))
 105         pgmname = opt.agent_program;
 106       else
 107         pgmname++;
 108
 109       argv[0] = pgmname;
 110       argv[1] = "--server";
 111       argv[2] = NULL;
 112
 113       i=0;
 114       if (log_get_fd () != -1)
 115         no_close_list[i++] = log_get_fd ();
 116       no_close_list[i++] = fileno (stderr);
 117       no_close_list[i] = -1;
 118
 119       /* connect to the agent and perform initial handshaking */
 120       rc = assuan_pipe_connect (&ctx, opt.agent_program, (char**)argv,
 121                                 no_close_list);
 122     }
 123   else
 124     {
 125       int prot;
 126       int pid;
 127
 128       infostr = xstrdup (infostr);
 129       if ( !(p = strchr (infostr, ':')) || p == infostr)
 130         {
 131           log_error (_("malformed GPG_AGENT_INFO environment variable\n"));
 132           xfree (infostr);
 133           force_pipe_server = 1;
 134           return start_agent ();
 135         }
 136       *p++ = 0;
 137       pid = atoi (p);
 138       while (*p && *p != ':')
 139         p++;
 140       prot = *p? atoi (p+1) : 0;
 141       if (prot != 1)
 142         {
 143           log_error (_("gpg-agent protocol version %d is not supported\n"),
 144                      prot);
 145           xfree (infostr);
 146           force_pipe_server = 1;
 147           return start_agent ();
 148         }
 149
 150       rc = assuan_socket_connect (&ctx, infostr, pid);
 151       xfree (infostr);
 152       if (rc == ASSUAN_Connect_Failed)
 153         {
 154           log_error (_("can't connect to the agent - trying fall back\n"));
 155           force_pipe_server = 1;
 156           return start_agent ();
 157         }
 158     }
 159
 160   if (rc)
 161     {
 162       log_error ("can't connect to the agent: %s\n", assuan_strerror (rc));
 163       return gpg_error (GPG_ERR_NO_AGENT);
 164     }
 165   agent_ctx = ctx;
 166
 167   if (DBG_ASSUAN)
 168     log_debug ("connection to agent established\n");
 169
 170   rc = assuan_transact (agent_ctx, "RESET", NULL, NULL, NULL, NULL, NULL, NULL);
 171   if (rc)
 172     return map_assuan_err (rc);
 173
 174 #ifdef __GNUC__
 175 #warning put this code into common/asshelp.c
 176 #endif
 177
 178   dft_display = getenv ("DISPLAY");
 179   if (opt.display || dft_display)
 180     {
 181       char *optstr;
 182       if (asprintf (&optstr, "OPTION display=%s",
 183                     opt.display ? opt.display : dft_display) < 0)
 184         return gpg_error_from_errno (errno);
 185       rc = assuan_transact (agent_ctx, optstr, NULL, NULL, NULL, NULL, NULL,
 186                             NULL);
 187       free (optstr);
 188       if (rc)
 189         return map_assuan_err (rc);
 190     }
 191   if (!opt.ttyname)
 192     {
 193       dft_ttyname = getenv ("GPG_TTY");
 194       if ((!dft_ttyname || !*dft_ttyname) && ttyname (0))
 195         dft_ttyname = ttyname (0);
 196     }
 197   if (opt.ttyname || dft_ttyname)
 198     {
 199       char *optstr;
 200       if (asprintf (&optstr, "OPTION ttyname=%s",
 201                     opt.ttyname ? opt.ttyname : dft_ttyname) < 0)
 202         return gpg_error_from_errno (errno);
 203       rc = assuan_transact (agent_ctx, optstr, NULL, NULL, NULL, NULL, NULL,
 204                             NULL);
 205       free (optstr);
 206       if (rc)
 207         return map_assuan_err (rc);
 208     }
 209   dft_ttytype = getenv ("TERM");
 210   if (opt.ttytype || (dft_ttyname && dft_ttytype))
 211     {
 212       char *optstr;
 213       if (asprintf (&optstr, "OPTION ttytype=%s",
 214                     opt.ttyname ? opt.ttytype : dft_ttytype) < 0)
 215         return gpg_error_from_errno (errno);
 216       rc = assuan_transact (agent_ctx, optstr, NULL, NULL, NULL, NULL, NULL,
 217                             NULL);
 218       free (optstr);
 219       if (rc)
 220         return map_assuan_err (rc);
 221     }
 222 #if defined(HAVE_SETLOCALE) && defined(LC_CTYPE)
 223   old_lc = setlocale (LC_CTYPE, NULL);
 224   if (old_lc)
 225     {
 226       old_lc = strdup (old_lc);
 227       if (!old_lc)
 228         return gpg_error_from_errno (errno);
 229
 230     }
 231   dft_lc = setlocale (LC_CTYPE, "");
 232 #endif
 233   if (opt.lc_ctype || (dft_ttyname && dft_lc))
 234     {
 235       char *optstr;
 236       if (asprintf (&optstr, "OPTION lc-ctype=%s",
 237                     opt.lc_ctype ? opt.lc_ctype : dft_lc) < 0)
 238         rc = gpg_error_from_errno (errno);
 239       else
 240         {
 241           rc = assuan_transact (agent_ctx, optstr, NULL, NULL, NULL, NULL, NULL,
 242                                 NULL);
 243           free (optstr);
 244           if (rc)
 245             rc = map_assuan_err (rc);
 246         }
 247     }
 248 #if defined(HAVE_SETLOCALE) && defined(LC_CTYPE)
 249   if (old_lc)
 250     {
 251       setlocale (LC_CTYPE, old_lc);
 252       free (old_lc);
 253     }
 254 #endif
 255   if (rc)
 256     return rc;
 257 #if defined(HAVE_SETLOCALE) && defined(LC_MESSAGES)
 258   old_lc = setlocale (LC_MESSAGES, NULL);
 259   if (old_lc)
 260     {
 261       old_lc = strdup (old_lc);
 262       if (!old_lc)
 263         return gpg_error_from_errno (errno);
 264     }
 265   dft_lc = setlocale (LC_MESSAGES, "");
 266 #endif
 267   if (opt.lc_messages || (dft_ttyname && dft_lc))
 268     {
 269       char *optstr;
 270       if (asprintf (&optstr, "OPTION lc-messages=%s",
 271                     opt.lc_messages ? opt.lc_messages : dft_lc) < 0)
 272         rc = gpg_error_from_errno (errno);
 273       else
 274         {
 275           rc = assuan_transact (agent_ctx, optstr, NULL, NULL, NULL, NULL, NULL,
 276                                 NULL);
 277           free (optstr);
 278           if (rc)
 279             rc = map_assuan_err (rc);
 280         }
 281     }
 282 #if defined(HAVE_SETLOCALE) && defined(LC_MESSAGES)
 283   if (old_lc)
 284     {
 285       setlocale (LC_MESSAGES, old_lc);
 286       free (old_lc);
 287     }
 288 #endif
 289
 290   return rc;
 291 }
 292
 293
 294 /* Return a new malloced string by unescaping the string S.  Escaping
 295    is percent escaping and '+'/space mapping.  A binary nul will
 296    silently be replaced by a 0xFF.  Function returns NULL to indicate
 297    an out of memory status. */
 298 static char *
 299 unescape_status_string (const unsigned char *s)
 300 {
 301   char *buffer, *d;
 302
 303   buffer = d = xtrymalloc (strlen (s)+1);
 304   if (!buffer)
 305     return NULL;
 306   while (*s)
 307     {
 308       if (*s == '%' && s[1] && s[2])
 309         {
 310           s++;
 311           *d = xtoi_2 (s);
 312           if (!*d)
 313             *d = '\xff';
 314           d++;
 315           s += 2;
 316         }
 317       else if (*s == '+')
 318         {
 319           *d++ = ' ';
 320           s++;
 321         }
 322       else
 323         *d++ = *s++;
 324     }
 325   *d = 0;
 326   return buffer;
 327 }
 328
 329 /* Take a 20 byte hexencoded string and put it into the the provided
 330    20 byte buffer FPR in binary format. */
 331 static int
 332 unhexify_fpr (const char *hexstr, unsigned char *fpr)
 333 {
 334   const char *s;
 335   int n;
 336
 337   for (s=hexstr, n=0; hexdigitp (s); s++, n++)
 338     ;
 339   if (*s || (n != 40))
 340     return 0; /* no fingerprint (invalid or wrong length). */
 341   n /= 2;
 342   for (s=hexstr, n=0; *s; s += 2, n++)
 343     fpr[n] = xtoi_2 (s);
 344   return 1; /* okay */
 345 }
 346
 347 /* Take the serial number from LINE and return it verbatim in a newly
 348    allocated string.  We make sure that only hex characters are
 349    returned. */
 350 static char *
 351 store_serialno (const char *line)
 352 {
 353   const char *s;
 354   char *p;
 355
 356   for (s=line; hexdigitp (s); s++)
 357     ;
 358   p = xtrymalloc (s + 1 - line);
 359   if (p)
 360     {
 361       memcpy (p, line, s-line);
 362       p[s-line] = 0;
 363     }
 364   return p;
 365 }
 366
 367
 368 \f
 369 #if 0
 370 /* Handle a KEYPARMS inquiry.  Note, we only send the data,
 371    assuan_transact takes care of flushing and writing the end */
 372 static AssuanError
 373 inq_genkey_parms (void *opaque, const char *keyword)
 374 {
 375   struct genkey_parm_s *parm = opaque;
 376   AssuanError rc;
 377
 378   rc = assuan_send_data (parm->ctx, parm->sexp, parm->sexplen);
 379   return rc;
 380 }
 381
 382
 383 \f
 384 /* Call the agent to generate a new key */
 385 int
 386 agent_genkey (KsbaConstSexp keyparms, KsbaSexp *r_pubkey)
 387 {
 388   int rc;
 389   struct genkey_parm_s gk_parm;
 390   membuf_t data;
 391   size_t len;
 392   char *buf;
 393
 394   *r_pubkey = NULL;
 395   rc = start_agent ();
 396   if (rc)
 397     return rc;
 398
 399   rc = assuan_transact (agent_ctx, "RESET", NULL, NULL,
 400                         NULL, NULL, NULL, NULL);
 401   if (rc)
 402     return map_assuan_err (rc);
 403
 404   init_membuf (&data, 1024);
 405   gk_parm.ctx = agent_ctx;
 406   gk_parm.sexp = keyparms;
 407   gk_parm.sexplen = gcry_sexp_canon_len (keyparms, 0, NULL, NULL);
 408   if (!gk_parm.sexplen)
 409     return gpg_error (GPG_ERR_INV_VALUE);
 410   rc = assuan_transact (agent_ctx, "GENKEY",
 411                         membuf_data_cb, &data,
 412                         inq_genkey_parms, &gk_parm, NULL, NULL);
 413   if (rc)
 414     {
 415       xfree (get_membuf (&data, &len));
 416       return map_assuan_err (rc);
 417     }
 418   buf = get_membuf (&data, &len);
 419   if (!buf)
 420     return gpg_error (GPG_ERR_ENOMEM);
 421   if (!gcry_sexp_canon_len (buf, len, NULL, NULL))
 422     {
 423       xfree (buf);
 424       return gpg_error (GPG_ERR_INV_SEXP);
 425     }
 426   *r_pubkey = buf;
 427   return 0;
 428 }
 429 #endif /*0*/
 430
 431
 432 \f
 433 /* Ask the agent whether the corresponding secret key is available for
 434    the given keygrip. */
 435 int
 436 agent_havekey (const char *hexkeygrip)
 437 {
 438   int rc;
 439   char line[ASSUAN_LINELENGTH];
 440
 441   rc = start_agent ();
 442   if (rc)
 443     return rc;
 444
 445   if (!hexkeygrip || strlen (hexkeygrip) != 40)
 446     return gpg_error (GPG_ERR_INV_VALUE);
 447
 448   snprintf (line, DIM(line)-1, "HAVEKEY %s", hexkeygrip);
 449   line[DIM(line)-1] = 0;
 450
 451   rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
 452   return map_assuan_err (rc);
 453 }
 454
 455 \f
 456 /* Release the card info structure INFO. */
 457 void
 458 agent_release_card_info (struct agent_card_info_s *info)
 459 {
 460   if (!info)
 461     return;
 462
 463   xfree (info->serialno); info->serialno = NULL;
 464   xfree (info->disp_name); info->disp_name = NULL;
 465   xfree (info->disp_lang); info->disp_lang = NULL;
 466   xfree (info->pubkey_url); info->pubkey_url = NULL;
 467   xfree (info->login_data); info->login_data = NULL;
 468   info->cafpr1valid = info->cafpr2valid = info->cafpr3valid = 0;
 469   info->fpr1valid = info->fpr2valid = info->fpr3valid = 0;
 470 }
 471
 472 static AssuanError
 473 learn_status_cb (void *opaque, const char *line)
 474 {
 475   struct agent_card_info_s *parm = opaque;
 476   const char *keyword = line;
 477   int keywordlen;
 478   int i;
 479
 480   for (keywordlen=0; *line && !spacep (line); line++, keywordlen++)
 481     ;
 482   while (spacep (line))
 483     line++;
 484
 485   if (keywordlen == 8 && !memcmp (keyword, "SERIALNO", keywordlen))
 486     {
 487       xfree (parm->serialno);
 488       parm->serialno = store_serialno (line);
 489     }
 490   else if (keywordlen == 9 && !memcmp (keyword, "DISP-NAME", keywordlen))
 491     {
 492       xfree (parm->disp_name);
 493       parm->disp_name = unescape_status_string (line);
 494     }
 495   else if (keywordlen == 9 && !memcmp (keyword, "DISP-LANG", keywordlen))
 496     {
 497       xfree (parm->disp_lang);
 498       parm->disp_lang = unescape_status_string (line);
 499     }
 500   else if (keywordlen == 8 && !memcmp (keyword, "DISP-SEX", keywordlen))
 501     {
 502       parm->disp_sex = *line == '1'? 1 : *line == '2' ? 2: 0;
 503     }
 504   else if (keywordlen == 10 && !memcmp (keyword, "PUBKEY-URL", keywordlen))
 505     {
 506       xfree (parm->pubkey_url);
 507       parm->pubkey_url = unescape_status_string (line);
 508     }
 509   else if (keywordlen == 10 && !memcmp (keyword, "LOGIN-DATA", keywordlen))
 510     {
 511       xfree (parm->login_data);
 512       parm->login_data = unescape_status_string (line);
 513     }
 514   else if (keywordlen == 11 && !memcmp (keyword, "SIG-COUNTER", keywordlen))
 515     {
 516       parm->sig_counter = strtoul (line, NULL, 0);
 517     }
 518   else if (keywordlen == 10 && !memcmp (keyword, "CHV-STATUS", keywordlen))
 519     {
 520       char *p, *buf;
 521
 522       buf = p = unescape_status_string (line);
 523       if (buf)
 524         {
 525           while (spacep (p))
 526             p++;
 527           parm->chv1_cached = atoi (p);
 528           while (*p && !spacep (p))
 529             p++;
 530           while (spacep (p))
 531             p++;
 532           for (i=0; *p && i < 3; i++)
 533             {
 534               parm->chvmaxlen[i] = atoi (p);
 535               while (*p && !spacep (p))
 536                 p++;
 537               while (spacep (p))
 538                 p++;
 539             }
 540           for (i=0; *p && i < 3; i++)
 541             {
 542               parm->chvretry[i] = atoi (p);
 543               while (*p && !spacep (p))
 544                 p++;
 545               while (spacep (p))
 546                 p++;
 547             }
 548           xfree (buf);
 549         }
 550     }
 551   else if (keywordlen == 7 && !memcmp (keyword, "KEY-FPR", keywordlen))
 552     {
 553       int no = atoi (line);
 554       while (*line && !spacep (line))
 555         line++;
 556       while (spacep (line))
 557         line++;
 558       if (no == 1)
 559         parm->fpr1valid = unhexify_fpr (line, parm->fpr1);
 560       else if (no == 2)
 561         parm->fpr2valid = unhexify_fpr (line, parm->fpr2);
 562       else if (no == 3)
 563         parm->fpr3valid = unhexify_fpr (line, parm->fpr3);
 564     }
 565   else if (keywordlen == 6 && !memcmp (keyword, "CA-FPR", keywordlen))
 566     {
 567       int no = atoi (line);
 568       while (*line && !spacep (line))
 569         line++;
 570       while (spacep (line))
 571         line++;
 572       if (no == 1)
 573         parm->cafpr1valid = unhexify_fpr (line, parm->cafpr1);
 574       else if (no == 2)
 575         parm->cafpr2valid = unhexify_fpr (line, parm->cafpr2);
 576       else if (no == 3)
 577         parm->cafpr3valid = unhexify_fpr (line, parm->cafpr3);
 578     }
 579
 580   return 0;
 581 }
 582
 583 /* Call the agent to learn about a smartcard */
 584 int
 585 agent_learn (struct agent_card_info_s *info)
 586 {
 587   int rc;
 588
 589   rc = start_agent ();
 590   if (rc)
 591     return rc;
 592
 593   memset (info, 0, sizeof *info);
 594   rc = assuan_transact (agent_ctx, "LEARN --send",
 595                         NULL, NULL, NULL, NULL,
 596                         learn_status_cb, info);
 597
 598   return map_assuan_err (rc);
 599 }
 600
 601 /* Call the agent to retrieve a data object.  This function returns
 602    the data in the same structure as used by the learn command.  It is
 603    allowed to update such a structure using this commmand. */
 604 int
 605 agent_scd_getattr (const char *name, struct agent_card_info_s *info)
 606 {
 607   int rc;
 608   char line[ASSUAN_LINELENGTH];
 609
 610   if (!*name)
 611     return gpg_error (GPG_ERR_INV_VALUE);
 612
 613   /* We assume that NAME does not need escaping. */
 614   if (12 + strlen (name) > DIM(line)-1)
 615     return gpg_error (GPG_ERR_TOO_LARGE);
 616   stpcpy (stpcpy (line, "SCD GETATTR "), name);
 617
 618   rc = start_agent ();
 619   if (rc)
 620     return rc;
 621
 622   rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL,
 623                         learn_status_cb, info);
 624
 625   return map_assuan_err (rc);
 626 }
 627
 628 \f
 629 /* Send an setattr command to the SCdaemon. */
 630 int
 631 agent_scd_setattr (const char *name,
 632                    const unsigned char *value, size_t valuelen)
 633 {
 634   int rc;
 635   char line[ASSUAN_LINELENGTH];
 636   char *p;
 637
 638   if (!*name || !valuelen)
 639     return gpg_error (GPG_ERR_INV_VALUE);
 640
 641   /* We assume that NAME does not need escaping. */
 642   if (12 + strlen (name) > DIM(line)-1)
 643     return gpg_error (GPG_ERR_TOO_LARGE);
 644
 645   p = stpcpy (stpcpy (line, "SCD SETATTR "), name);
 646   *p++ = ' ';
 647   for (; valuelen; value++, valuelen--)
 648     {
 649       if (p >= line + DIM(line)-5 )
 650         return gpg_error (GPG_ERR_TOO_LARGE);
 651       if (*value < ' ' || *value == '+' || *value == '%')
 652         {
 653           sprintf (p, "%%%02X", *value);
 654           p += 3;
 655         }
 656       else if (*value == ' ')
 657         *p++ = '+';
 658       else
 659         *p++ = *value;
 660     }
 661   *p = 0;
 662
 663   rc = start_agent ();
 664   if (rc)
 665     return rc;
 666
 667   rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
 668   return map_assuan_err (rc);
 669 }
 670
 671 \f
 672 /* Status callback for the SCD GENKEY command. */
 673 static AssuanError
 674 scd_genkey_cb (void *opaque, const char *line)
 675 {
 676   struct agent_card_genkey_s *parm = opaque;
 677   const char *keyword = line;
 678   int keywordlen;
 679   gpg_error_t rc;
 680
 681   log_debug ("got status line `%s'\n", line);
 682   for (keywordlen=0; *line && !spacep (line); line++, keywordlen++)
 683     ;
 684   while (spacep (line))
 685     line++;
 686
 687   if (keywordlen == 7 && !memcmp (keyword, "KEY-FPR", keywordlen))
 688     {
 689       parm->fprvalid = unhexify_fpr (line, parm->fpr);
 690     }
 691   if (keywordlen == 8 && !memcmp (keyword, "KEY-DATA", keywordlen))
 692     {
 693       gcry_mpi_t a;
 694       const char *name = line;
 695
 696       while (*line && !spacep (line))
 697         line++;
 698       while (spacep (line))
 699         line++;
 700
 701       rc = gcry_mpi_scan (&a, GCRYMPI_FMT_HEX, line, 0, NULL);
 702       if (rc)
 703         log_error ("error parsing received key data: %s\n", gpg_strerror (rc));
 704       else if (*name == 'n' && spacep (name+1))
 705         parm->n = a;
 706       else if (*name == 'e' && spacep (name+1))
 707         parm->e = a;
 708       else
 709         {
 710           log_info ("unknown parameter name in received key data\n");
 711           gcry_mpi_release (a);
 712         }
 713     }
 714   else if (keywordlen == 14 && !memcmp (keyword,"KEY-CREATED-AT", keywordlen))
 715     {
 716       parm->created_at = (u32)strtoul (line, NULL, 10);
 717     }
 718
 719   return 0;
 720 }
 721
 722 /* Send a GENKEY command to the SCdaemon. */
 723 int
 724 agent_scd_genkey (struct agent_card_genkey_s *info, int keyno, int force)
 725 {
 726   int rc;
 727   char line[ASSUAN_LINELENGTH];
 728
 729   rc = start_agent ();
 730   if (rc)
 731     return rc;
 732
 733   memset (info, 0, sizeof *info);
 734   snprintf (line, DIM(line)-1, "SCD GENKEY %s%d",
 735             force? "--force ":"", keyno);
 736   line[DIM(line)-1] = 0;
 737
 738   memset (info, 0, sizeof *info);
 739   rc = assuan_transact (agent_ctx, line,
 740                         NULL, NULL, NULL, NULL,
 741                         scd_genkey_cb, info);
 742
 743   return map_assuan_err (rc);
 744 }
 745
 746 \f
 747 static AssuanError
 748 membuf_data_cb (void *opaque, const void *buffer, size_t length)
 749 {
 750   membuf_t *data = opaque;
 751
 752   if (buffer)
 753     put_membuf (data, buffer, length);
 754   return 0;
 755 }
 756
 757 /* Send a sign command to the scdaemon via gpg-agent's pass thru
 758    mechanism. */
 759 int
 760 agent_scd_pksign (const char *serialno, int hashalgo,
 761                   const unsigned char *indata, size_t indatalen,
 762                   char **r_buf, size_t *r_buflen)
 763 {
 764   int rc, i;
 765   char *p, line[ASSUAN_LINELENGTH];
 766   membuf_t data;
 767   size_t len;
 768
 769   /* Note, hashalgo is not yet used but hardwired to SHA1 in SCdaemon. */
 770
 771   *r_buf = NULL;
 772   *r_buflen = 0;
 773
 774   rc = start_agent ();
 775   if (rc)
 776     return rc;
 777
 778   if (indatalen*2 + 50 > DIM(line))
 779     return gpg_error (GPG_ERR_GENERAL);
 780
 781   sprintf (line, "SCD SETDATA ");
 782   p = line + strlen (line);
 783   for (i=0; i < indatalen ; i++, p += 2 )
 784     sprintf (p, "%02X", indata[i]);
 785   rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
 786   if (rc)
 787     return map_assuan_err (rc);
 788
 789   init_membuf (&data, 1024);
 790 #if 0
 791   if (!hashalgo) /* Temporary test hack. */
 792     snprintf (line, DIM(line)-1, "SCD PKAUTH %s", serialno);
 793   else
 794 #endif
 795    snprintf (line, DIM(line)-1, "SCD PKSIGN %s", serialno);
 796   line[DIM(line)-1] = 0;
 797   rc = assuan_transact (agent_ctx, line, membuf_data_cb, &data,
 798                         NULL, NULL, NULL, NULL);
 799   if (rc)
 800     {
 801       xfree (get_membuf (&data, &len));
 802       return map_assuan_err (rc);
 803     }
 804   *r_buf = get_membuf (&data, r_buflen);
 805
 806   return 0;
 807 }
 808
 809
 810 /* Decrypt INDATA of length INDATALEN using the card identified by
 811    SERIALNO.  Return the plaintext in a nwly allocated buffer stored
 812    at the address of R_BUF.
 813
 814    Note, we currently support only RSA or more exactly algorithms
 815    taking one input data element. */
 816 int
 817 agent_scd_pkdecrypt (const char *serialno,
 818                      const unsigned char *indata, size_t indatalen,
 819                      char **r_buf, size_t *r_buflen)
 820 {
 821   int rc, i;
 822   char *p, line[ASSUAN_LINELENGTH];
 823   membuf_t data;
 824   size_t len;
 825
 826   *r_buf = NULL;
 827   rc = start_agent ();
 828   if (rc)
 829     return rc;
 830
 831   /* FIXME: use secure memory where appropriate */
 832   if (indatalen*2 + 50 > DIM(line))
 833     return gpg_error (GPG_ERR_GENERAL);
 834
 835   sprintf (line, "SCD SETDATA ");
 836   p = line + strlen (line);
 837   for (i=0; i < indatalen ; i++, p += 2 )
 838     sprintf (p, "%02X", indata[i]);
 839   rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
 840   if (rc)
 841     return map_assuan_err (rc);
 842
 843   init_membuf (&data, 1024);
 844   snprintf (line, DIM(line)-1, "SCD PKDECRYPT %s", serialno);
 845   line[DIM(line)-1] = 0;
 846   rc = assuan_transact (agent_ctx, line,
 847                         membuf_data_cb, &data,
 848                         NULL, NULL, NULL, NULL);
 849   if (rc)
 850     {
 851       xfree (get_membuf (&data, &len));
 852       return map_assuan_err (rc);
 853     }
 854   *r_buf = get_membuf (&data, r_buflen);
 855   if (!*r_buf)
 856     return gpg_error (GPG_ERR_ENOMEM);
 857
 858   return 0;
 859 }
 860
 861
 862 /* Change the PIN of an OpenPGP card or reset the retry counter.
 863    CHVNO 1: Change the PIN
 864          2: Same as 1
 865          3: Change the admin PIN
 866        101: Set a new PIN and reset the retry counter
 867        102: Same as 101
 868  */
 869 int
 870 agent_scd_change_pin (int chvno)
 871 {
 872   int rc;
 873   char line[ASSUAN_LINELENGTH];
 874   const char *reset = "";
 875
 876   if (chvno >= 100)
 877     reset = "--reset";
 878   chvno %= 100;
 879
 880   rc = start_agent ();
 881   if (rc)
 882     return rc;
 883
 884   snprintf (line, DIM(line)-1, "SCD PASSWD %s %d", reset, chvno);
 885   line[DIM(line)-1] = 0;
 886   rc = assuan_transact (agent_ctx, line, NULL, NULL,
 887                         NULL, NULL, NULL, NULL);
 888   return map_assuan_err (rc);
 889 }
 890
 891
 892 /* Perform a CHECKPIN operation.  SERIALNO should be the serial
 893    number of the card - optioanlly followed by the fingerprint;
 894    however the fingerprint is ignored here. */
 895 int
 896 agent_scd_checkpin  (const char *serialno)
 897 {
 898   int rc;
 899   char line[ASSUAN_LINELENGTH];
 900
 901   rc = start_agent ();
 902   if (rc)
 903     return rc;
 904
 905   snprintf (line, DIM(line)-1, "SCD CHECKPIN %s", serialno);
 906   line[DIM(line)-1] = 0;
 907   return assuan_transact (agent_ctx, line,
 908                           NULL, NULL,
 909                           NULL, NULL, NULL, NULL);
 910 }
 911
 912