1 files changed, 445 insertions, 0 deletions
diff --git a/agent/learncard.c b/agent/learncard.c
new file mode 100644
index 0000000..abe1dd0
--- /dev/null
+++ b/agent/learncard.c
@@ -0,0 +1,445 @@
+/* learncard.c - Handle the LEARN command
+ * Copyright (C) 2002, 2003, 2004, 2009 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <assert.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+#include "agent.h"
+#include <assuan.h>
+
+/* Structures used by the callback mechanism to convey information
+   pertaining to key pairs.  */
+struct keypair_info_s
+{
+  struct keypair_info_s *next;
+  int no_cert;
+  char *id;          /* points into grip */
+  char hexgrip[1];   /* The keygrip (i.e. a hash over the public key
+                        parameters) formatted as a hex string.
+                        Allocated somewhat large to also act as
+                        memeory for the above ID field. */
+};
+typedef struct keypair_info_s *KEYPAIR_INFO;
+
+struct kpinfo_cb_parm_s
+{
+  ctrl_t ctrl;
+  int error;
+  KEYPAIR_INFO info;
+};
+
+
+/* Structures used by the callback mechanism to convey information
+   pertaining to certificates.  */
+struct certinfo_s {
+  struct certinfo_s *next;
+  int type;
+  int done;
+  char id[1];
+};
+typedef struct certinfo_s *CERTINFO;
+
+struct certinfo_cb_parm_s
+{
+  ctrl_t ctrl;
+  int error;
+  CERTINFO info;
+};
+
+
+/* Structures used by the callback mechanism to convey assuan status
+   lines.  */
+struct sinfo_s {
+  struct sinfo_s *next;
+  char *data;       /* Points into keyword. */
+  char keyword[1];
+};
+typedef struct sinfo_s *SINFO;
+
+struct sinfo_cb_parm_s {
+  int error;
+  SINFO info;
+};
+
+
+/* Destructor for key information objects. */
+static void
+release_keypair_info (KEYPAIR_INFO info)
+{
+  while (info)
+    {
+      KEYPAIR_INFO tmp = info->next;
+      xfree (info);
+      info = tmp;
+    }
+}
+
+/* Destructor for certificate information objects. */
+static void
+release_certinfo (CERTINFO info)
+{
+  while (info)
+    {
+      CERTINFO tmp = info->next;
+      xfree (info);
+      info = tmp;
+    }
+}
+
+/* Destructor for status information objects. */
+static void
+release_sinfo (SINFO info)
+{
+  while (info)
+    {
+      SINFO tmp = info->next;
+      xfree (info);
+      info = tmp;
+    }
+}
+
+
+
+/* This callback is used by agent_card_learn and passed the content of
+   all KEYPAIRINFO lines.  It merely stores this data away */
+static void
+kpinfo_cb (void *opaque, const char *line)
+{
+  struct kpinfo_cb_parm_s *parm = opaque;
+  KEYPAIR_INFO item;
+  char *p;
+
+  if (parm->error)
+    return; /* no need to gather data after an error occurred */
+
+  if ((parm->error = agent_write_status (parm->ctrl, "PROGRESS",
+                                         "learncard", "k", "0", "0", NULL)))
+    return;
+
+  item = xtrycalloc (1, sizeof *item + strlen (line));
+  if (!item)
+    {
+      parm->error = out_of_core ();
+      return;
+    }
+  strcpy (item->hexgrip, line);
+  for (p = item->hexgrip; hexdigitp (p); p++)
+    ;
+  if (p == item->hexgrip && *p == 'X' && spacep (p+1))
+    {
+      item->no_cert = 1;
+      p++;
+    }
+  else if ((p - item->hexgrip) != 40 || !spacep (p))
+    { /* not a 20 byte hex keygrip or not followed by a space */
+      parm->error = gpg_error (GPG_ERR_INV_RESPONSE);
+      xfree (item);
+      return;
+    }
+  *p++ = 0;
+  while (spacep (p))
+    p++;
+  item->id = p;
+  while (*p && !spacep (p))
+    p++;
+  if (p == item->id)
+    { /* invalid ID string */
+      parm->error = gpg_error (GPG_ERR_INV_RESPONSE);
+      xfree (item);
+      return;
+    }
+  *p = 0; /* ignore trailing stuff */
+
+  /* store it */
+  item->next = parm->info;
+  parm->info = item;
+}
+
+
+/* This callback is used by agent_card_learn and passed the content of
+   all CERTINFO lines.  It merely stores this data away */
+static void
+certinfo_cb (void *opaque, const char *line)
+{
+  struct certinfo_cb_parm_s *parm = opaque;
+  CERTINFO item;
+  int type;
+  char *p, *pend;
+
+  if (parm->error)
+    return; /* no need to gather data after an error occurred */
+
+  if ((parm->error = agent_write_status (parm->ctrl, "PROGRESS",
+                                         "learncard", "c", "0", "0", NULL)))
+    return;
+
+  type = strtol (line, &p, 10);
+  while (spacep (p))
+    p++;
+  for (pend = p; *pend && !spacep (pend); pend++)
+    ;
+  if (p == pend || !*p)
+    {
+      parm->error = gpg_error (GPG_ERR_INV_RESPONSE);
+      return;
+    }
+  *pend = 0; /* ignore trailing stuff */
+
+  item = xtrycalloc (1, sizeof *item + strlen (p));
+  if (!item)
+    {
+      parm->error = out_of_core ();
+      return;
+    }
+  item->type = type;
+  strcpy (item->id, p);
+  /* store it */
+  item->next = parm->info;
+  parm->info = item;
+}
+
+
+/* This callback is used by agent_card_learn and passed the content of
+   all SINFO lines.  It merely stores this data away */
+static void
+sinfo_cb (void *opaque, const char *keyword, size_t keywordlen,
+          const char *data)
+{
+  struct sinfo_cb_parm_s *sparm = opaque;
+  SINFO item;
+
+  if (sparm->error)
+    return; /* no need to gather data after an error occurred */
+
+  item = xtrycalloc (1, sizeof *item + keywordlen + 1 + strlen (data));
+  if (!item)
+    {
+      sparm->error = out_of_core ();
+      return;
+    }
+  memcpy (item->keyword, keyword, keywordlen);
+  item->data = item->keyword + keywordlen;
+  *item->data = 0;
+  item->data++;
+  strcpy (item->data, data);
+  /* store it */
+  item->next = sparm->info;
+  sparm->info = item;
+}
+
+
+
+static int
+send_cert_back (ctrl_t ctrl, const char *id, void *assuan_context)
+{
+  int rc;
+  char *derbuf;
+  size_t derbuflen;
+
+  rc = agent_card_readcert (ctrl, id, &derbuf, &derbuflen);
+  if (rc)
+    {
+      const char *action;
+
+      switch (gpg_err_code (rc))
+        {
+        case GPG_ERR_INV_ID:
+        case GPG_ERR_NOT_FOUND:
+          action = " - ignored";
+          break;
+        default:
+          action = "";
+          break;
+        }
+      if (opt.verbose || !*action)
+        log_info ("error reading certificate '%s': %s%s\n",
+                  id? id:"?", gpg_strerror (rc), action);
+
+      return *action? 0 : rc;
+    }
+
+  rc = assuan_send_data (assuan_context, derbuf, derbuflen);
+  xfree (derbuf);
+  if (!rc)
+    rc = assuan_send_data (assuan_context, NULL, 0);
+  if (!rc)
+    rc = assuan_write_line (assuan_context, "END");
+  if (rc)
+    {
+      log_error ("sending certificate failed: %s\n",
+                 gpg_strerror (rc));
+      return rc;
+    }
+  return 0;
+}
+
+/* Perform the learn operation.  If ASSUAN_CONTEXT is not NULL and
+   SEND is true all new certificates are send back via Assuan.  */
+int
+agent_handle_learn (ctrl_t ctrl, int send, void *assuan_context, int force)
+{
+  int rc;
+  struct kpinfo_cb_parm_s parm;
+  struct certinfo_cb_parm_s cparm;
+  struct sinfo_cb_parm_s sparm;
+  const char *serialno = NULL;
+  KEYPAIR_INFO item;
+  SINFO sitem;
+  unsigned char grip[20];
+  char *p;
+  int i;
+  static int certtype_list[] = {
+    111, /* Root CA */
+    101, /* trusted */
+    102, /* useful */
+    100, /* regular */
+    /* We don't include 110 here because gpgsm can't handle that
+       special root CA format. */
+    -1 /* end of list */
+  };
+
+
+  memset (&parm, 0, sizeof parm);
+  memset (&cparm, 0, sizeof cparm);
+  memset (&sparm, 0, sizeof sparm);
+  parm.ctrl = ctrl;
+  cparm.ctrl = ctrl;
+
+  /* Now gather all the available info. */
+  rc = agent_card_learn (ctrl, kpinfo_cb, &parm, certinfo_cb, &cparm,
+                         sinfo_cb, &sparm);
+  if (!rc && (parm.error || cparm.error || sparm.error))
+    rc = parm.error? parm.error : cparm.error? cparm.error : sparm.error;
+  if (rc)
+    {
+      log_debug ("agent_card_learn failed: %s\n", gpg_strerror (rc));
+      goto leave;
+    }
+
+  /* Pass on all the collected status information. */
+  for (sitem = sparm.info; sitem; sitem = sitem->next)
+    {
+      if (!strcmp (sitem->keyword, "SERIALNO"))
+        serialno = sitem->data;
+      if (assuan_context)
+        assuan_write_status (assuan_context, sitem->keyword, sitem->data);
+    }
+
+  if (!serialno)
+    {
+      rc = GPG_ERR_NOT_FOUND;
+      goto leave;
+    }
+
+  log_info ("card has S/N: %s\n", serialno);
+
+  /* Write out the certificates in a standard order. */
+  for (i=0; certtype_list[i] != -1; i++)
+    {
+      CERTINFO citem;
+      for (citem = cparm.info; citem; citem = citem->next)
+        {
+          if (certtype_list[i] != citem->type)
+            continue;
+
+          if (opt.verbose)
+            log_info ("          id: %s    (type=%d)\n",
+                      citem->id, citem->type);
+
+          if (assuan_context && send)
+            {
+              rc = send_cert_back (ctrl, citem->id, assuan_context);
+              if (rc)
+                goto leave;
+              citem->done = 1;
+            }
+        }
+    }
+
+  for (item = parm.info; item; item = item->next)
+    {
+      unsigned char *pubkey;
+
+      if (opt.verbose)
+        log_info ("          id: %s    (grip=%s)\n", item->id, item->hexgrip);
+
+      if (item->no_cert)
+        continue; /* No public key yet available. */
+
+      if (assuan_context)
+        {
+          agent_write_status (ctrl, "KEYPAIRINFO",
+                              item->hexgrip, item->id, NULL);
+        }
+
+      for (p=item->hexgrip, i=0; i < 20; p += 2, i++)
+        grip[i] = xtoi_2 (p);
+
+      if (!force && !agent_key_available (grip))
+        continue; /* The key is already available. */
+
+      /* Unknown key - store it. */
+      rc = agent_card_readkey (ctrl, item->id, &pubkey);
+      if (rc)
+        {
+          log_debug ("agent_card_readkey failed: %s\n", gpg_strerror (rc));
+          goto leave;
+        }
+
+      rc = agent_write_shadow_key (grip, serialno, item->id, pubkey, force);
+      xfree (pubkey);
+      if (rc)
+        goto leave;
+
+      if (opt.verbose)
+        log_info ("          id: %s - shadow key created\n", item->id);
+
+      if (assuan_context && send)
+        {
+          CERTINFO citem;
+
+          /* only send the certificate if we have not done so before */
+          for (citem = cparm.info; citem; citem = citem->next)
+            {
+              if (!strcmp (citem->id, item->id))
+                break;
+            }
+          if (!citem)
+            {
+              rc = send_cert_back (ctrl, item->id, assuan_context);
+              if (rc)
+                goto leave;
+            }
+        }
+    }
+
+
+ leave:
+  release_keypair_info (parm.info);
+  release_certinfo (cparm.info);
+  release_sinfo (sparm.info);
+  return rc;
+}