Adding upstream version 2.2.40.upstream/2.2.40upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 637 insertions, 0 deletions

diff --git a/g10/skclist.c b/g10/skclist.c
new file mode 100644
index 0000000..d0511ad
--- /dev/null
+++ b/g10/skclist.c
@@ -0,0 +1,637 @@
+/* skclist.c - Build a list of secret keys
+ * Copyright (C) 1998, 1999, 2000, 2001, 2006,
+ *               2010 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "gpg.h"
+#include "options.h"
+#include "packet.h"
+#include "../common/status.h"
+#include "keydb.h"
+#include "../common/util.h"
+#include "../common/i18n.h"
+#include "keyserver-internal.h"
+#include "call-agent.h"
+
+
+/* Return true if Libgcrypt's RNG is in faked mode.  */
+int
+random_is_faked (void)
+{
+  return !!gcry_control (GCRYCTL_FAKED_RANDOM_P, 0);
+}
+
+
+void
+release_sk_list (SK_LIST sk_list)
+{
+  SK_LIST sk_rover;
+
+  for (; sk_list; sk_list = sk_rover)
+    {
+      sk_rover = sk_list->next;
+      free_public_key (sk_list->pk);
+      xfree (sk_list);
+    }
+}
+
+
+/* Check that we are only using keys which don't have
+ * the string "(insecure!)" or "not secure" or "do not use"
+ * in one of the user ids.  */
+static int
+is_insecure (ctrl_t ctrl, PKT_public_key *pk)
+{
+  u32 keyid[2];
+  KBNODE node = NULL, u;
+  int insecure = 0;
+
+  keyid_from_pk (pk, keyid);
+  node = get_pubkeyblock (ctrl, keyid);
+  for (u = node; u; u = u->next)
+    {
+      if (u->pkt->pkttype == PKT_USER_ID)
+	{
+	  PKT_user_id *id = u->pkt->pkt.user_id;
+	  if (id->attrib_data)
+	    continue;		/* skip attribute packets */
+	  if (strstr (id->name, "(insecure!)")
+	      || strstr (id->name, "not secure")
+	      || strstr (id->name, "do not use")
+	      || strstr (id->name, "(INSECURE!)"))
+	    {
+	      insecure = 1;
+	      break;
+	    }
+	}
+    }
+  release_kbnode (node);
+
+  return insecure;
+}
+
+static int
+key_present_in_sk_list (SK_LIST sk_list, PKT_public_key *pk)
+{
+  for (; sk_list; sk_list = sk_list->next)
+    {
+      if (!cmp_public_keys (sk_list->pk, pk))
+	return 0;
+    }
+  return -1;
+}
+
+static int
+is_duplicated_entry (strlist_t list, strlist_t item)
+{
+  for (; list && list != item; list = list->next)
+    {
+      if (!strcmp (list->d, item->d))
+	return 1;
+    }
+  return 0;
+}
+
+
+gpg_error_t
+build_sk_list (ctrl_t ctrl,
+               strlist_t locusr, SK_LIST *ret_sk_list, unsigned int use)
+{
+  gpg_error_t err;
+  SK_LIST sk_list = NULL;
+
+  /* XXX: Change this function to use get_pubkeys instead of
+     getkey_byname to detect ambiguous key specifications and warn
+     about duplicate keyblocks.  For ambiguous key specifications on
+     the command line or provided interactively, prompt the user to
+     select the best key.  If a key specification is ambiguous and we
+     are in batch mode, die.  */
+
+  if (!locusr) /* No user ids given - use the card key or the default key.  */
+    {
+      struct agent_card_info_s info;
+      PKT_public_key *pk;
+      char *serialno;
+
+      memset (&info, 0, sizeof(info));
+      pk = xmalloc_clear (sizeof *pk);
+      pk->req_usage = use;
+
+      /* Check if a card is available.  If any, use the key as a hint.  */
+      err = agent_scd_serialno (&serialno, NULL);
+      if (!err)
+        {
+          xfree (serialno);
+          err = agent_scd_getattr ("KEY-FPR", &info);
+          if (err)
+            log_error ("error retrieving key fingerprint from card: %s\n",
+                       gpg_strerror (err));
+        }
+
+      err = get_seckey_default_or_card (ctrl, pk,
+                                        info.fpr1valid? info.fpr1 : NULL, 20);
+      if (err)
+	{
+	  free_public_key (pk);
+	  pk = NULL;
+	  log_error ("no default secret key: %s\n", gpg_strerror (err));
+	  write_status_text (STATUS_INV_SGNR, get_inv_recpsgnr_code (err));
+	}
+      else if ((err = openpgp_pk_test_algo2 (pk->pubkey_algo, use)))
+	{
+	  free_public_key (pk);
+	  pk = NULL;
+	  log_error ("invalid default secret key: %s\n", gpg_strerror (err));
+	  write_status_text (STATUS_INV_SGNR, get_inv_recpsgnr_code (err));
+	}
+      else
+	{
+	  SK_LIST r;
+
+	  if (random_is_faked () && !is_insecure (ctrl, pk))
+	    {
+	      log_info (_("key is not flagged as insecure - "
+			  "can't use it with the faked RNG!\n"));
+	      free_public_key (pk);
+	      pk = NULL;
+	      write_status_text (STATUS_INV_SGNR,
+				 get_inv_recpsgnr_code (GPG_ERR_NOT_TRUSTED));
+	    }
+	  else
+	    {
+	      r = xmalloc (sizeof *r);
+	      r->pk = pk;
+	      pk = NULL;
+	      r->next = sk_list;
+	      r->mark = 0;
+	      sk_list = r;
+	    }
+	}
+    }
+  else /* Check the given user ids.  */
+    {
+      strlist_t locusr_orig = locusr;
+
+      for (; locusr; locusr = locusr->next)
+	{
+	  PKT_public_key *pk;
+
+	  err = 0;
+	  /* Do an early check against duplicated entries.  However
+	   * this won't catch all duplicates because the user IDs may
+	   * be specified in different ways.  */
+	  if (is_duplicated_entry (locusr_orig, locusr))
+	    {
+	      log_info (_("skipped \"%s\": duplicated\n"), locusr->d);
+	      continue;
+	    }
+	  pk = xmalloc_clear (sizeof *pk);
+	  pk->req_usage = use;
+          if ((err = getkey_byname (ctrl, NULL, pk, locusr->d, 1, NULL)))
+	    {
+	      free_public_key (pk);
+	      pk = NULL;
+	      log_error (_("skipped \"%s\": %s\n"),
+			 locusr->d, gpg_strerror (err));
+	      write_status_text_and_buffer
+		(STATUS_INV_SGNR, get_inv_recpsgnr_code (err),
+		 locusr->d, strlen (locusr->d), -1);
+	    }
+	  else if (!key_present_in_sk_list (sk_list, pk))
+	    {
+	      free_public_key (pk);
+	      pk = NULL;
+	      log_info (_("skipped: secret key already present\n"));
+	    }
+	  else if ((err = openpgp_pk_test_algo2 (pk->pubkey_algo, use)))
+	    {
+	      free_public_key (pk);
+	      pk = NULL;
+	      log_error ("skipped \"%s\": %s\n", locusr->d, gpg_strerror (err));
+	      write_status_text_and_buffer
+		(STATUS_INV_SGNR, get_inv_recpsgnr_code (err),
+		 locusr->d, strlen (locusr->d), -1);
+	    }
+	  else
+	    {
+	      SK_LIST r;
+
+	      if (pk->version == 4 && (use & PUBKEY_USAGE_SIG)
+		  && pk->pubkey_algo == PUBKEY_ALGO_ELGAMAL_E)
+		{
+		  log_info (_("skipped \"%s\": %s\n"), locusr->d,
+			    _("this is a PGP generated Elgamal key which"
+			      " is not secure for signatures!"));
+		  free_public_key (pk);
+		  pk = NULL;
+		  write_status_text_and_buffer
+		    (STATUS_INV_SGNR,
+		     get_inv_recpsgnr_code (GPG_ERR_WRONG_KEY_USAGE),
+		     locusr->d, strlen (locusr->d), -1);
+		}
+	      else if (random_is_faked () && !is_insecure (ctrl, pk))
+		{
+		  log_info (_("key is not flagged as insecure - "
+			      "can't use it with the faked RNG!\n"));
+		  free_public_key (pk);
+		  pk = NULL;
+		  write_status_text_and_buffer
+		    (STATUS_INV_SGNR,
+		     get_inv_recpsgnr_code (GPG_ERR_NOT_TRUSTED),
+		     locusr->d, strlen (locusr->d), -1);
+		}
+	      else
+		{
+		  r = xmalloc (sizeof *r);
+		  r->pk = pk;
+		  pk = NULL;
+		  r->next = sk_list;
+		  r->mark = 0;
+		  sk_list = r;
+		}
+	    }
+	}
+    }
+
+  if (!err && !sk_list)
+    {
+      log_error ("no valid signators\n");
+      write_status_text (STATUS_NO_SGNR, "0");
+      err = gpg_error (GPG_ERR_NO_USER_ID);
+    }
+
+  if (err)
+    release_sk_list (sk_list);
+  else
+    *ret_sk_list = sk_list;
+  return err;
+}
+
+
+/* Enumerate some secret keys (specifically, those specified with
+ * --default-key and --try-secret-key).  Use the following procedure:
+ *
+ *  1) Initialize a void pointer to NULL
+ *  2) Pass a reference to this pointer to this function (CONTEXT)
+ *     and provide space for the secret key (SK)
+ *  3) Call this function as long as it does not return an error (or
+ *     until you are done).  The error code GPG_ERR_EOF indicates the
+ *     end of the listing.
+ *  4) Call this function a last time with SK set to NULL,
+ *     so that can free it's context.
+ *
+ *  TAKE CARE: When the function returns SK belongs to CONTEXT and may
+ *  not be freed by the caller; neither on success nor on error.
+ *
+ * In pseudo-code:
+ *
+ *   void *ctx = NULL;
+ *   PKT_public_key *sk = xmalloc_clear (sizeof (*sk));
+ *
+ *   while ((err = enum_secret_keys (&ctx, sk)))
+ *     { // Process SK.
+ *       if (done)
+ *         break;
+ *       sk = xmalloc_clear (sizeof (*sk));
+ *     }
+ *
+ *   // Release any resources used by CTX.
+ *   enum_secret_keys (&ctx, NULL);
+ *
+ *   if (gpg_err_code (err) != GPG_ERR_EOF)
+ *     ; // An error occurred.
+ */
+gpg_error_t
+enum_secret_keys (ctrl_t ctrl, void **context, PKT_public_key *sk)
+{
+  gpg_error_t err = 0;
+  const char *name;
+  int cardkey;    /* We got an encryption fingerprint from the card */
+                  /* in c->info.fpr2.                               */
+  kbnode_t keyblock;
+  struct
+  {
+    int eof;
+    int state;
+    int cardkey_done;
+    strlist_t sl;
+    strlist_t card_list;
+    char *serialno;
+    char fpr2[2 * MAX_FINGERPRINT_LEN + 3 ];
+    struct agent_card_info_s info;
+    kbnode_t keyblock;
+    kbnode_t node;
+    getkey_ctx_t ctx;
+    SK_LIST results;
+  } *c = *context;
+
+#if MAX_FINGERPRINT_LEN < KEYGRIP_LEN
+# error buffer too short for this configuration
+#endif
+
+  if (!c)
+    {
+      /* Make a new context.  */
+      c = xtrycalloc (1, sizeof *c);
+      if (!c)
+        {
+          err = gpg_error_from_syserror ();
+          free_public_key (sk);
+          return err;
+        }
+      *context = c;
+    }
+
+  if (!sk)
+    {
+      /* Free the context.  */
+      xfree (c->serialno);
+      free_strlist (c->card_list);
+      release_sk_list (c->results);
+      release_kbnode (c->keyblock);
+      getkey_end (ctrl, c->ctx);
+      xfree (c);
+      *context = NULL;
+      return 0;
+    }
+
+  if (c->eof)
+    {
+      free_public_key (sk);
+      return gpg_error (GPG_ERR_EOF);
+    }
+
+  for (;;)
+    {
+      /* Loop until we have a keyblock.  */
+      while (!c->keyblock)
+        {
+          /* Loop over the list of secret keys.  */
+          do
+            {
+              char *serialno;
+
+              name = NULL;
+              cardkey = 0;
+              keyblock = NULL;
+              switch (c->state)
+                {
+                case 0: /* First try to use the --default-key.  */
+                  name = parse_def_secret_key (ctrl);
+                  c->state = 1;
+                  break;
+
+                case 1: /* Init list of keys to try.  */
+                  c->sl = opt.secret_keys_to_try;
+                  c->state++;
+                  break;
+
+                case 2: /* Get next item from list.  */
+                  if (c->sl)
+                    {
+                      name = c->sl->d;
+                      c->sl = c->sl->next;
+                    }
+                  else
+                    c->state++;
+                  break;
+
+                case 3: /* Init list of card keys to try.  */
+                  err = agent_scd_cardlist (&c->card_list);
+                  if (!err)
+                    agent_scd_serialno (&c->serialno, NULL);
+                  c->sl = c->card_list;
+                  c->state++;
+                  break;
+
+                case 4: /* Get next item from card list.  */
+                  if (c->sl)
+                    {
+                      err = agent_scd_serialno (&serialno, c->sl->d);
+                      if (err)
+                        {
+                          if (opt.verbose)
+                            log_info (_("error getting serial number of card: %s\n"),
+                                      gpg_strerror (err));
+                          c->sl = c->sl->next;
+                          continue;
+                        }
+
+                      xfree (serialno);
+                      err = agent_scd_getattr ("KEY-FPR", &c->info);
+                      if (!err)
+                        {
+                          if (c->info.fpr2valid)
+                            {
+                              c->fpr2[0] = '0';
+                              c->fpr2[1] = 'x';
+                              bin2hex (c->info.fpr2, sizeof c->info.fpr2,
+                                       c->fpr2 + 2);
+                              name = c->fpr2;
+                              cardkey = 1;
+                            }
+                        }
+                      else if (gpg_err_code (err) == GPG_ERR_INV_NAME)
+                        {
+                          /* KEY-FPR not supported by the card - get
+                           * the key using the keygrip.  */
+                          char *keyref;
+                          strlist_t kplist, sl;
+                          const char *s;
+                          int i;
+
+                          err = agent_scd_getattr_one ("$ENCRKEYID", &keyref);
+                          if (!err)
+                            {
+                              err = agent_scd_keypairinfo (ctrl, &kplist);
+                              if (!err)
+                                {
+                                  for (sl = kplist; sl; sl = sl->next)
+                                    if ((s = strchr (sl->d, ' '))
+                                        && !strcmp (s+1, keyref))
+                                      break;
+                                  if (sl)
+                                    {
+                                      c->fpr2[0] = '&';
+                                      for (i=1, s=sl->d;
+                                           (*s && *s != ' '
+                                            && i < sizeof c->fpr2 - 3);
+                                           s++, i++)
+                                        c->fpr2[i] = *s;
+                                      c->fpr2[i] = 0;
+                                      name = c->fpr2;
+                                    }
+                                  else /* Restore error.  */
+                                    err = gpg_error (GPG_ERR_INV_NAME);
+                                  free_strlist (kplist);
+                                }
+                            }
+                          xfree (keyref);
+                        }
+                      if (err)
+                        log_error ("error retrieving key from card: %s\n",
+                                   gpg_strerror (err));
+
+                      c->sl = c->sl->next;
+                    }
+                  else
+                    {
+                      serialno = c->serialno;
+                      if (serialno)
+                        {
+                          /* Select the original card again.  */
+                          agent_scd_serialno (&c->serialno, serialno);
+                          xfree (serialno);
+                        }
+                      c->state++;
+                    }
+                  break;
+
+                case 5: /* Init search context to enum all secret keys.  */
+                  err = getkey_bynames (ctrl, &c->ctx, NULL, NULL, 1,
+                                        &keyblock);
+                  if (err)
+                    {
+                      release_kbnode (keyblock);
+                      keyblock = NULL;
+                      getkey_end (ctrl, c->ctx);
+                      c->ctx = NULL;
+                    }
+                  c->state++;
+                  break;
+
+                case 6: /* Get next item from the context.  */
+                  if (c->ctx)
+                    {
+                      err = getkey_next (ctrl, c->ctx, NULL, &keyblock);
+                      if (err)
+                        {
+                          release_kbnode (keyblock);
+                          keyblock = NULL;
+                          getkey_end (ctrl, c->ctx);
+                          c->ctx = NULL;
+                        }
+                    }
+                  else
+                    c->state++;
+                  break;
+
+                default: /* No more names to check - stop.  */
+                  c->eof = 1;
+                  free_public_key (sk);
+                  return gpg_error (GPG_ERR_EOF);
+                }
+            }
+          while ((!name || !*name) && !keyblock);
+
+          if (keyblock)
+            c->node = c->keyblock = keyblock;
+          else
+            {
+              err = getkey_byname (ctrl, NULL, NULL, name, 1, &c->keyblock);
+              if (err)
+                {
+                  /* getkey_byname might return a keyblock even in the
+                     error case - I have not checked.  Thus better release
+                     it.  */
+                  release_kbnode (c->keyblock);
+                  c->keyblock = NULL;
+                  /* If this was a card key we might not yet have the
+                   * public key for it.  Thus check whether the card
+                   * can return the fingerprint of the encryption key
+                   * and we can then find the public key via LDAP.  */
+                  if (cardkey && !c->cardkey_done
+                      && gpg_err_code (err) == GPG_ERR_NO_SECKEY)
+                    {
+                      /* Note that this code does not handle the case
+                       * for two readers having both openpgp
+                       * encryption keys.  Only one will be tried.  */
+                      c->cardkey_done = 1;
+                      if (opt.debug)
+                        log_debug ("using LDAP to find public key"
+                                   " for current card\n");
+                      if (!keyserver_import_fprint
+                          (ctrl, c->info.fpr2, sizeof c->info.fpr2,
+                           opt.keyserver, KEYSERVER_IMPORT_FLAG_LDAP))
+                        {
+                          char fpr_string[MAX_FINGERPRINT_LEN * 2 + 1];
+
+                          bin2hex (c->info.fpr2, sizeof c->info.fpr2,
+                                   fpr_string);
+                          err = getkey_byname (ctrl, NULL, NULL, fpr_string, 1,
+                                               &c->keyblock);
+                          if (err)
+                            {
+                              release_kbnode (c->keyblock);
+                              c->keyblock = NULL;
+                            }
+                          else
+                            c->node = c->keyblock;
+                        }
+                    }
+                }
+              else
+                c->node = c->keyblock;
+            }
+        }
+
+      /* Get the next key from the current keyblock.  */
+      for (; c->node; c->node = c->node->next)
+        {
+          if (c->node->pkt->pkttype == PKT_PUBLIC_KEY
+              || c->node->pkt->pkttype == PKT_PUBLIC_SUBKEY)
+            {
+              SK_LIST r;
+
+              /* Skip this candidate if it's already enumerated.  */
+              for (r = c->results; r; r = r->next)
+                if (!cmp_public_keys (r->pk, c->node->pkt->pkt.public_key))
+                  break;
+              if (r)
+                continue;
+
+              copy_public_key (sk, c->node->pkt->pkt.public_key);
+              c->node = c->node->next;
+
+              r = xtrycalloc (1, sizeof (*r));
+              if (!r)
+                {
+                  err = gpg_error_from_syserror ();
+                  free_public_key (sk);
+                  return err;
+                }
+
+              r->pk = sk;
+              r->next = c->results;
+              c->results = r;
+
+              return 0; /* Found.  */
+            }
+        }
+
+      /* Dispose the keyblock and continue.  */
+      release_kbnode (c->keyblock);
+      c->keyblock = NULL;
+    }
+}