sm/call-agent.c

   1 /* call-agent.c - Divert GPGSM operations to the agent
   2  * Copyright (C) 2001, 2002, 2003, 2005, 2007,
   3  *               2008 Free Software Foundation, Inc.
   4  *
   5  * This file is part of GnuPG.
   6  *
   7  * GnuPG is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * GnuPG is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <config.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <errno.h>
  26 #include <unistd.h>
  27 #include <time.h>
  28 #include <assert.h>
  29 #ifdef HAVE_LOCALE_H
  30 #include <locale.h>
  31 #endif
  32
  33 #include "gpgsm.h"
  34 #include <gcrypt.h>
  35 #include <assuan.h>
  36 #include "i18n.h"
  37 #include "asshelp.h"
  38 #include "keydb.h" /* fixme: Move this to import.c */
  39 #include "membuf.h"
  40
  41
  42 static assuan_context_t agent_ctx = NULL;
  43
  44
  45 struct cipher_parm_s
  46 {
  47   ctrl_t ctrl;
  48   assuan_context_t ctx;
  49   const unsigned char *ciphertext;
  50   size_t ciphertextlen;
  51 };
  52
  53 struct genkey_parm_s
  54 {
  55   ctrl_t ctrl;
  56   assuan_context_t ctx;
  57   const unsigned char *sexp;
  58   size_t sexplen;
  59 };
  60
  61 struct learn_parm_s
  62 {
  63   int error;
  64   ctrl_t ctrl;
  65   assuan_context_t ctx;
  66   membuf_t *data;
  67 };
  68
  69
  70 \f
  71 /* Try to connect to the agent via socket or fork it off and work by
  72    pipes.  Handle the server's initial greeting */
  73 static int
  74 start_agent (ctrl_t ctrl)
  75 {
  76   int rc;
  77
  78   if (agent_ctx)
  79     rc = 0;      /* fixme: We need a context for each thread or
  80                     serialize the access to the agent (which is
  81                     suitable given that the agent is not MT. */
  82   else
  83     {
  84       rc = start_new_gpg_agent (&agent_ctx,
  85                                 GPG_ERR_SOURCE_DEFAULT,
  86                                 opt.homedir,
  87                                 opt.agent_program,
  88                                 opt.display, opt.ttyname, opt.ttytype,
  89                                 opt.lc_ctype, opt.lc_messages,
  90                                 opt.xauthority, opt.pinentry_user_data,
  91                                 opt.verbose, DBG_ASSUAN,
  92                                 gpgsm_status2, ctrl);
  93
  94       if (!rc)
  95         {
  96           /* Tell the agent that we support Pinentry notifications.  No
  97              error checking so that it will work also with older
  98              agents.  */
  99           assuan_transact (agent_ctx, "OPTION allow-pinentry-notify",
 100                            NULL, NULL, NULL, NULL, NULL, NULL);
 101         }
 102     }
 103
 104   if (!ctrl->agent_seen)
 105     {
 106       ctrl->agent_seen = 1;
 107       audit_log_ok (ctrl->audit, AUDIT_AGENT_READY, rc);
 108     }
 109
 110   return rc;
 111 }
 112
 113
 114
 115 static int
 116 membuf_data_cb (void *opaque, const void *buffer, size_t length)
 117 {
 118   membuf_t *data = opaque;
 119
 120   if (buffer)
 121     put_membuf (data, buffer, length);
 122   return 0;
 123 }
 124
 125
 126 /* This is the default inquiry callback.  It mainly handles the
 127    Pinentry notifications.  */
 128 static int
 129 default_inq_cb (void *opaque, const char *line)
 130 {
 131   gpg_error_t err;
 132   ctrl_t ctrl = opaque;
 133
 134   if (!strncmp (line, "PINENTRY_LAUNCHED", 17) && (line[17]==' '||!line[17]))
 135     {
 136       err = gpgsm_proxy_pinentry_notify (ctrl, line);
 137       if (err)
 138         log_error (_("failed to proxy %s inquiry to client\n"),
 139                    "PINENTRY_LAUNCHED");
 140       /* We do not pass errors to avoid breaking other code.  */
 141     }
 142   else
 143     log_error ("ignoring gpg-agent inquiry `%s'\n", line);
 144
 145   return 0;
 146 }
 147
 148
 149
 150 \f
 151 /* Call the agent to do a sign operation using the key identified by
 152    the hex string KEYGRIP. */
 153 int
 154 gpgsm_agent_pksign (ctrl_t ctrl, const char *keygrip, const char *desc,
 155                     unsigned char *digest, size_t digestlen, int digestalgo,
 156                     unsigned char **r_buf, size_t *r_buflen )
 157 {
 158   int rc, i;
 159   char *p, line[ASSUAN_LINELENGTH];
 160   membuf_t data;
 161   size_t len;
 162
 163   *r_buf = NULL;
 164   rc = start_agent (ctrl);
 165   if (rc)
 166     return rc;
 167
 168   if (digestlen*2 + 50 > DIM(line))
 169     return gpg_error (GPG_ERR_GENERAL);
 170
 171   rc = assuan_transact (agent_ctx, "RESET", NULL, NULL, NULL, NULL, NULL, NULL);
 172   if (rc)
 173     return rc;
 174
 175   snprintf (line, DIM(line)-1, "SIGKEY %s", keygrip);
 176   line[DIM(line)-1] = 0;
 177   rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
 178   if (rc)
 179     return rc;
 180
 181   if (desc)
 182     {
 183       snprintf (line, DIM(line)-1, "SETKEYDESC %s", desc);
 184       line[DIM(line)-1] = 0;
 185       rc = assuan_transact (agent_ctx, line,
 186                             NULL, NULL, NULL, NULL, NULL, NULL);
 187       if (rc)
 188         return rc;
 189     }
 190
 191   sprintf (line, "SETHASH %d ", digestalgo);
 192   p = line + strlen (line);
 193   for (i=0; i < digestlen ; i++, p += 2 )
 194     sprintf (p, "%02X", digest[i]);
 195   rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
 196   if (rc)
 197     return rc;
 198
 199   init_membuf (&data, 1024);
 200   rc = assuan_transact (agent_ctx, "PKSIGN",
 201                         membuf_data_cb, &data, default_inq_cb, ctrl,
 202                         NULL, NULL);
 203   if (rc)
 204     {
 205       xfree (get_membuf (&data, &len));
 206       return rc;
 207     }
 208   *r_buf = get_membuf (&data, r_buflen);
 209
 210   if (!gcry_sexp_canon_len (*r_buf, *r_buflen, NULL, NULL))
 211     {
 212       xfree (*r_buf); *r_buf = NULL;
 213       return gpg_error (GPG_ERR_INV_VALUE);
 214     }
 215
 216   return *r_buf? 0 : out_of_core ();
 217 }
 218
 219
 220 /* Call the scdaemon to do a sign operation using the key identified by
 221    the hex string KEYID. */
 222 int
 223 gpgsm_scd_pksign (ctrl_t ctrl, const char *keyid, const char *desc,
 224                   unsigned char *digest, size_t digestlen, int digestalgo,
 225                   unsigned char **r_buf, size_t *r_buflen )
 226 {
 227   int rc, i;
 228   char *p, line[ASSUAN_LINELENGTH];
 229   membuf_t data;
 230   size_t len;
 231   const char *hashopt;
 232   unsigned char *sigbuf;
 233   size_t sigbuflen;
 234
 235   *r_buf = NULL;
 236
 237   switch(digestalgo)
 238     {
 239     case GCRY_MD_SHA1:  hashopt = "--hash=sha1"; break;
 240     case GCRY_MD_RMD160:hashopt = "--hash=rmd160"; break;
 241     case GCRY_MD_MD5:   hashopt = "--hash=md5"; break;
 242     case GCRY_MD_SHA256:hashopt = "--hash=sha256"; break;
 243     default:
 244       return gpg_error (GPG_ERR_DIGEST_ALGO);
 245     }
 246
 247   rc = start_agent (ctrl);
 248   if (rc)
 249     return rc;
 250
 251   if (digestlen*2 + 50 > DIM(line))
 252     return gpg_error (GPG_ERR_GENERAL);
 253
 254   p = stpcpy (line, "SCD SETDATA " );
 255   for (i=0; i < digestlen ; i++, p += 2 )
 256     sprintf (p, "%02X", digest[i]);
 257   rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
 258   if (rc)
 259     return rc;
 260
 261   init_membuf (&data, 1024);
 262
 263   snprintf (line, DIM(line)-1, "SCD PKSIGN %s %s", hashopt, keyid);
 264   line[DIM(line)-1] = 0;
 265   rc = assuan_transact (agent_ctx, line,
 266                         membuf_data_cb, &data, default_inq_cb, ctrl,
 267                         NULL, NULL);
 268   if (rc)
 269     {
 270       xfree (get_membuf (&data, &len));
 271       return rc;
 272     }
 273   sigbuf = get_membuf (&data, &sigbuflen);
 274
 275   /* Create an S-expression from it which is formatted like this:
 276      "(7:sig-val(3:rsa(1:sSIGBUFLEN:SIGBUF)))" Fixme: If a card ever
 277      creates non-RSA keys we need to change things. */
 278   *r_buflen = 21 + 11 + sigbuflen + 4;
 279   p = xtrymalloc (*r_buflen);
 280   *r_buf = (unsigned char*)p;
 281   if (!p)
 282     {
 283       xfree (sigbuf);
 284       return 0;
 285     }
 286   p = stpcpy (p, "(7:sig-val(3:rsa(1:s" );
 287   sprintf (p, "%u:", (unsigned int)sigbuflen);
 288   p += strlen (p);
 289   memcpy (p, sigbuf, sigbuflen);
 290   p += sigbuflen;
 291   strcpy (p, ")))");
 292   xfree (sigbuf);
 293
 294   assert (gcry_sexp_canon_len (*r_buf, *r_buflen, NULL, NULL));
 295   return  0;
 296 }
 297
 298
 299
 300 \f
 301 /* Handle a CIPHERTEXT inquiry.  Note, we only send the data,
 302    assuan_transact talkes care of flushing and writing the end */
 303 static int
 304 inq_ciphertext_cb (void *opaque, const char *line)
 305 {
 306   struct cipher_parm_s *parm = opaque;
 307   int rc;
 308
 309   if (!strncmp (line, "CIPHERTEXT", 10) && (line[10]==' '||!line[10]))
 310     {
 311       assuan_begin_confidential (parm->ctx);
 312       rc = assuan_send_data (parm->ctx, parm->ciphertext, parm->ciphertextlen);
 313       assuan_end_confidential (parm->ctx);
 314     }
 315   else
 316     rc = default_inq_cb (parm->ctrl, line);
 317
 318   return rc;
 319 }
 320
 321
 322 /* Call the agent to do a decrypt operation using the key identified by
 323    the hex string KEYGRIP. */
 324 int
 325 gpgsm_agent_pkdecrypt (ctrl_t ctrl, const char *keygrip, const char *desc,
 326                        ksba_const_sexp_t ciphertext,
 327                        char **r_buf, size_t *r_buflen )
 328 {
 329   int rc;
 330   char line[ASSUAN_LINELENGTH];
 331   membuf_t data;
 332   struct cipher_parm_s cipher_parm;
 333   size_t n, len;
 334   char *p, *buf, *endp;
 335   size_t ciphertextlen;
 336
 337   if (!keygrip || strlen(keygrip) != 40 || !ciphertext || !r_buf || !r_buflen)
 338     return gpg_error (GPG_ERR_INV_VALUE);
 339   *r_buf = NULL;
 340
 341   ciphertextlen = gcry_sexp_canon_len (ciphertext, 0, NULL, NULL);
 342   if (!ciphertextlen)
 343     return gpg_error (GPG_ERR_INV_VALUE);
 344
 345   rc = start_agent (ctrl);
 346   if (rc)
 347     return rc;
 348
 349   rc = assuan_transact (agent_ctx, "RESET", NULL, NULL, NULL, NULL, NULL, NULL);
 350   if (rc)
 351     return rc;
 352
 353   assert ( DIM(line) >= 50 );
 354   snprintf (line, DIM(line)-1, "SETKEY %s", keygrip);
 355   line[DIM(line)-1] = 0;
 356   rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
 357   if (rc)
 358     return rc;
 359
 360   if (desc)
 361     {
 362       snprintf (line, DIM(line)-1, "SETKEYDESC %s", desc);
 363       line[DIM(line)-1] = 0;
 364       rc = assuan_transact (agent_ctx, line,
 365                             NULL, NULL, NULL, NULL, NULL, NULL);
 366       if (rc)
 367         return rc;
 368     }
 369
 370   init_membuf (&data, 1024);
 371   cipher_parm.ctrl = ctrl;
 372   cipher_parm.ctx = agent_ctx;
 373   cipher_parm.ciphertext = ciphertext;
 374   cipher_parm.ciphertextlen = ciphertextlen;
 375   rc = assuan_transact (agent_ctx, "PKDECRYPT",
 376                         membuf_data_cb, &data,
 377                         inq_ciphertext_cb, &cipher_parm, NULL, NULL);
 378   if (rc)
 379     {
 380       xfree (get_membuf (&data, &len));
 381       return rc;
 382     }
 383
 384   put_membuf (&data, "", 1); /* Make sure it is 0 terminated. */
 385   buf = get_membuf (&data, &len);
 386   if (!buf)
 387     return gpg_error (GPG_ERR_ENOMEM);
 388   assert (len); /* (we forced Nul termination.)  */
 389
 390   if (*buf == '(')
 391     {
 392       if (len < 13 || memcmp (buf, "(5:value", 8) ) /* "(5:valueN:D)\0" */
 393         return gpg_error (GPG_ERR_INV_SEXP);
 394       len -= 11;   /* Count only the data of the second part. */
 395       p = buf + 8; /* Skip leading parenthesis and the value tag. */
 396     }
 397   else
 398     {
 399       /* For compatibility with older gpg-agents handle the old style
 400          incomplete S-exps. */
 401       len--;      /* Do not count the Nul. */
 402       p = buf;
 403     }
 404
 405   n = strtoul (p, &endp, 10);
 406   if (!n || *endp != ':')
 407     return gpg_error (GPG_ERR_INV_SEXP);
 408   endp++;
 409   if (endp-p+n > len)
 410     return gpg_error (GPG_ERR_INV_SEXP); /* Oops: Inconsistent S-Exp. */
 411
 412   memmove (buf, endp, n);
 413
 414   *r_buflen = n;
 415   *r_buf = buf;
 416   return 0;
 417 }
 418
 419
 420
 421
 422 \f
 423 /* Handle a KEYPARMS inquiry.  Note, we only send the data,
 424    assuan_transact takes care of flushing and writing the end */
 425 static int
 426 inq_genkey_parms (void *opaque, const char *line)
 427 {
 428   struct genkey_parm_s *parm = opaque;
 429   int rc;
 430
 431   if (!strncmp (line, "KEYPARAM", 8) && (line[8]==' '||!line[8]))
 432     {
 433       rc = assuan_send_data (parm->ctx, parm->sexp, parm->sexplen);
 434     }
 435   else
 436     rc = default_inq_cb (parm->ctrl, line);
 437
 438   return rc;
 439 }
 440
 441
 442 \f
 443 /* Call the agent to generate a newkey */
 444 int
 445 gpgsm_agent_genkey (ctrl_t ctrl,
 446                     ksba_const_sexp_t keyparms, ksba_sexp_t *r_pubkey)
 447 {
 448   int rc;
 449   struct genkey_parm_s gk_parm;
 450   membuf_t data;
 451   size_t len;
 452   unsigned char *buf;
 453
 454   *r_pubkey = NULL;
 455   rc = start_agent (ctrl);
 456   if (rc)
 457     return rc;
 458
 459   rc = assuan_transact (agent_ctx, "RESET", NULL, NULL, NULL, NULL, NULL, NULL);
 460   if (rc)
 461     return rc;
 462
 463   init_membuf (&data, 1024);
 464   gk_parm.ctrl = ctrl;
 465   gk_parm.ctx = agent_ctx;
 466   gk_parm.sexp = keyparms;
 467   gk_parm.sexplen = gcry_sexp_canon_len (keyparms, 0, NULL, NULL);
 468   if (!gk_parm.sexplen)
 469     return gpg_error (GPG_ERR_INV_VALUE);
 470   rc = assuan_transact (agent_ctx, "GENKEY",
 471                         membuf_data_cb, &data,
 472                         inq_genkey_parms, &gk_parm, NULL, NULL);
 473   if (rc)
 474     {
 475       xfree (get_membuf (&data, &len));
 476       return rc;
 477     }
 478   buf = get_membuf (&data, &len);
 479   if (!buf)
 480     return gpg_error (GPG_ERR_ENOMEM);
 481   if (!gcry_sexp_canon_len (buf, len, NULL, NULL))
 482     {
 483       xfree (buf);
 484       return gpg_error (GPG_ERR_INV_SEXP);
 485     }
 486   *r_pubkey = buf;
 487   return 0;
 488 }
 489
 490 \f
 491 /* Call the agent to read the public key part for a given keygrip.  If
 492    FROMCARD is true, the key is directly read from the current
 493    smartcard. In this case HEXKEYGRIP should be the keyID
 494    (e.g. OPENPGP.3). */
 495 int
 496 gpgsm_agent_readkey (ctrl_t ctrl, int fromcard, const char *hexkeygrip,
 497                      ksba_sexp_t *r_pubkey)
 498 {
 499   int rc;
 500   membuf_t data;
 501   size_t len;
 502   unsigned char *buf;
 503   char line[ASSUAN_LINELENGTH];
 504
 505   *r_pubkey = NULL;
 506   rc = start_agent (ctrl);
 507   if (rc)
 508     return rc;
 509
 510   rc = assuan_transact (agent_ctx, "RESET",NULL, NULL, NULL, NULL, NULL, NULL);
 511   if (rc)
 512     return rc;
 513
 514   snprintf (line, DIM(line)-1, "%sREADKEY %s",
 515             fromcard? "SCD ":"", hexkeygrip);
 516   line[DIM(line)-1] = 0;
 517
 518   init_membuf (&data, 1024);
 519   rc = assuan_transact (agent_ctx, line,
 520                         membuf_data_cb, &data,
 521                         default_inq_cb, ctrl, NULL, NULL);
 522   if (rc)
 523     {
 524       xfree (get_membuf (&data, &len));
 525       return rc;
 526     }
 527   buf = get_membuf (&data, &len);
 528   if (!buf)
 529     return gpg_error (GPG_ERR_ENOMEM);
 530   if (!gcry_sexp_canon_len (buf, len, NULL, NULL))
 531     {
 532       xfree (buf);
 533       return gpg_error (GPG_ERR_INV_SEXP);
 534     }
 535   *r_pubkey = buf;
 536   return 0;
 537 }
 538
 539 \f
 540
 541 static int
 542 istrusted_status_cb (void *opaque, const char *line)
 543 {
 544   struct rootca_flags_s *flags = opaque;
 545
 546   if (!strncmp (line, "TRUSTLISTFLAG", 13) && (line[13]==' ' || !line[13]))
 547     {
 548       for (line += 13; *line == ' '; line++)
 549         ;
 550       if (!strncmp (line, "relax", 5) && (line[5] == ' ' || !line[5]))
 551         flags->relax = 1;
 552       else if (!strncmp (line, "cm", 2) && (line[2] == ' ' || !line[2]))
 553         flags->chain_model = 1;
 554     }
 555   return 0;
 556 }
 557
 558
 559
 560 /* Ask the agent whether the certificate is in the list of trusted
 561    keys.  ROOTCA_FLAGS is guaranteed to be cleared on error. */
 562 int
 563 gpgsm_agent_istrusted (ctrl_t ctrl, ksba_cert_t cert,
 564                        struct rootca_flags_s *rootca_flags)
 565 {
 566   int rc;
 567   char *fpr;
 568   char line[ASSUAN_LINELENGTH];
 569
 570   memset (rootca_flags, 0, sizeof *rootca_flags);
 571
 572   rc = start_agent (ctrl);
 573   if (rc)
 574     return rc;
 575
 576   fpr = gpgsm_get_fingerprint_hexstring (cert, GCRY_MD_SHA1);
 577   if (!fpr)
 578     {
 579       log_error ("error getting the fingerprint\n");
 580       return gpg_error (GPG_ERR_GENERAL);
 581     }
 582
 583   snprintf (line, DIM(line)-1, "ISTRUSTED %s", fpr);
 584   line[DIM(line)-1] = 0;
 585   xfree (fpr);
 586
 587   rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL,
 588                         istrusted_status_cb, rootca_flags);
 589   if (!rc)
 590     rootca_flags->valid = 1;
 591   return rc;
 592 }
 593
 594 /* Ask the agent to mark CERT as a trusted Root-CA one */
 595 int
 596 gpgsm_agent_marktrusted (ctrl_t ctrl, ksba_cert_t cert)
 597 {
 598   int rc;
 599   char *fpr, *dn;
 600   char line[ASSUAN_LINELENGTH];
 601
 602   rc = start_agent (ctrl);
 603   if (rc)
 604     return rc;
 605
 606   fpr = gpgsm_get_fingerprint_hexstring (cert, GCRY_MD_SHA1);
 607   if (!fpr)
 608     {
 609       log_error ("error getting the fingerprint\n");
 610       return gpg_error (GPG_ERR_GENERAL);
 611     }
 612
 613   dn = ksba_cert_get_issuer (cert, 0);
 614   if (!dn)
 615     {
 616       xfree (fpr);
 617       return gpg_error (GPG_ERR_GENERAL);
 618     }
 619   snprintf (line, DIM(line)-1, "MARKTRUSTED %s S %s", fpr, dn);
 620   line[DIM(line)-1] = 0;
 621   ksba_free (dn);
 622   xfree (fpr);
 623
 624   rc = assuan_transact (agent_ctx, line, NULL, NULL,
 625                         default_inq_cb, ctrl, NULL, NULL);
 626   return rc;
 627 }
 628
 629
 630 \f
 631 /* Ask the agent whether the a corresponding secret key is available
 632    for the given keygrip */
 633 int
 634 gpgsm_agent_havekey (ctrl_t ctrl, const char *hexkeygrip)
 635 {
 636   int rc;
 637   char line[ASSUAN_LINELENGTH];
 638
 639   rc = start_agent (ctrl);
 640   if (rc)
 641     return rc;
 642
 643   if (!hexkeygrip || strlen (hexkeygrip) != 40)
 644     return gpg_error (GPG_ERR_INV_VALUE);
 645
 646   snprintf (line, DIM(line)-1, "HAVEKEY %s", hexkeygrip);
 647   line[DIM(line)-1] = 0;
 648
 649   rc = assuan_transact (agent_ctx, line, NULL, NULL, NULL, NULL, NULL, NULL);
 650   return rc;
 651 }
 652
 653 \f
 654 static int
 655 learn_cb (void *opaque, const void *buffer, size_t length)
 656 {
 657   struct learn_parm_s *parm = opaque;
 658   size_t len;
 659   char *buf;
 660   ksba_cert_t cert;
 661   int rc;
 662
 663   if (parm->error)
 664     return 0;
 665
 666   if (buffer)
 667     {
 668       put_membuf (parm->data, buffer, length);
 669       return 0;
 670     }
 671   /* END encountered - process what we have */
 672   buf = get_membuf (parm->data, &len);
 673   if (!buf)
 674     {
 675       parm->error = gpg_error (GPG_ERR_ENOMEM);
 676       return 0;
 677     }
 678
 679
 680   /* FIXME: this should go into import.c */
 681   rc = ksba_cert_new (&cert);
 682   if (rc)
 683     {
 684       parm->error = rc;
 685       return 0;
 686     }
 687   rc = ksba_cert_init_from_mem (cert, buf, len);
 688   if (rc)
 689     {
 690       log_error ("failed to parse a certificate: %s\n", gpg_strerror (rc));
 691       ksba_cert_release (cert);
 692       parm->error = rc;
 693       return 0;
 694     }
 695
 696   rc = gpgsm_basic_cert_check (parm->ctrl, cert);
 697   if (gpg_err_code (rc) == GPG_ERR_MISSING_CERT)
 698     { /* For later use we store it in the ephemeral database. */
 699       log_info ("issuer certificate missing - storing as ephemeral\n");
 700       keydb_store_cert (cert, 1, NULL);
 701     }
 702   else if (rc)
 703     log_error ("invalid certificate: %s\n", gpg_strerror (rc));
 704   else
 705     {
 706       int existed;
 707
 708       if (!keydb_store_cert (cert, 0, &existed))
 709         {
 710           if (opt.verbose > 1 && existed)
 711             log_info ("certificate already in DB\n");
 712           else if (opt.verbose && !existed)
 713             log_info ("certificate imported\n");
 714         }
 715     }
 716
 717   ksba_cert_release (cert);
 718   init_membuf (parm->data, 4096);
 719   return 0;
 720 }
 721
 722 /* Call the agent to learn about a smartcard */
 723 int
 724 gpgsm_agent_learn (ctrl_t ctrl)
 725 {
 726   int rc;
 727   struct learn_parm_s learn_parm;
 728   membuf_t data;
 729   size_t len;
 730
 731   rc = start_agent (ctrl);
 732   if (rc)
 733     return rc;
 734
 735   init_membuf (&data, 4096);
 736   learn_parm.error = 0;
 737   learn_parm.ctrl = ctrl;
 738   learn_parm.ctx = agent_ctx;
 739   learn_parm.data = &data;
 740   rc = assuan_transact (agent_ctx, "LEARN --send",
 741                         learn_cb, &learn_parm,
 742                         NULL, NULL, NULL, NULL);
 743   xfree (get_membuf (&data, &len));
 744   if (rc)
 745     return rc;
 746   return learn_parm.error;
 747 }
 748
 749 \f
 750 /* Ask the agent to change the passphrase of the key identified by
 751    HEXKEYGRIP. If DESC is not NULL, display instead of the default
 752    description message. */
 753 int
 754 gpgsm_agent_passwd (ctrl_t ctrl, const char *hexkeygrip, const char *desc)
 755 {
 756   int rc;
 757   char line[ASSUAN_LINELENGTH];
 758
 759   rc = start_agent (ctrl);
 760   if (rc)
 761     return rc;
 762
 763   if (!hexkeygrip || strlen (hexkeygrip) != 40)
 764     return gpg_error (GPG_ERR_INV_VALUE);
 765
 766   if (desc)
 767     {
 768       snprintf (line, DIM(line)-1, "SETKEYDESC %s", desc);
 769       line[DIM(line)-1] = 0;
 770       rc = assuan_transact (agent_ctx, line,
 771                             NULL, NULL, NULL, NULL, NULL, NULL);
 772       if (rc)
 773         return rc;
 774     }
 775
 776   snprintf (line, DIM(line)-1, "PASSWD %s", hexkeygrip);
 777   line[DIM(line)-1] = 0;
 778
 779   rc = assuan_transact (agent_ctx, line, NULL, NULL,
 780                         default_inq_cb, ctrl, NULL, NULL);
 781   return rc;
 782 }
 783
 784
 785 \f
 786 /* Ask the agent to pop up a confirmation dialog with the text DESC
 787    and an okay and cancel button.  */
 788 gpg_error_t
 789 gpgsm_agent_get_confirmation (ctrl_t ctrl, const char *desc)
 790 {
 791   int rc;
 792   char line[ASSUAN_LINELENGTH];
 793
 794   rc = start_agent (ctrl);
 795   if (rc)
 796     return rc;
 797
 798   snprintf (line, DIM(line)-1, "GET_CONFIRMATION %s", desc);
 799   line[DIM(line)-1] = 0;
 800
 801   rc = assuan_transact (agent_ctx, line, NULL, NULL,
 802                         default_inq_cb, ctrl, NULL, NULL);
 803   return rc;
 804 }