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g10: factor out a function for secret key retrieval.
* g10/export.c (receive_seckey_from_agent): New. (do_export_stream): Use it. -- Also fixed a memory leak of WRAPPEDKEY on a successful path of build_packet. In the log message, key is now by a hexgrip instead of a format by keystr_with_sub.
This commit is contained in:
NIIBE Yutaka
parent
fc010b6c7f
commit
e644aa7f59
153
g10/export.c
153
g10/export.c
@ -825,6 +825,78 @@ print_status_exported (PKT_public_key *pk)
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}
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/*
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* Receive a secret key from agent specified by HEXGRIP.
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*
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* Since the key data from agant is encrypted, decrypt it by CIPHERHD.
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* Then, parse the decrypted key data in transfer format, and put
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* secret papameters into PK.
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*
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* CACHE_NONCE_ADDR is used to share nonce for multple key retrievals.
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*/
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gpg_error_t
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receive_seckey_from_agent (ctrl_t ctrl, gcry_cipher_hd_t cipherhd,
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char **cache_nonce_addr, const char *hexgrip,
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PKT_public_key *pk)
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{
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gpg_error_t err = 0;
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unsigned char *wrappedkey = NULL;
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size_t wrappedkeylen;
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unsigned char *key = NULL;
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size_t keylen, realkeylen;
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gcry_sexp_t s_skey;
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char *prompt;
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if (opt.verbose)
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log_info ("key %s: asking agent for the secret parts\n", hexgrip);
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prompt = gpg_format_keydesc (pk, FORMAT_KEYDESC_EXPORT,1);
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err = agent_export_key (ctrl, hexgrip, prompt, cache_nonce_addr,
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&wrappedkey, &wrappedkeylen);
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xfree (prompt);
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if (err)
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goto unwraperror;
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if (wrappedkeylen < 24)
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{
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err = gpg_error (GPG_ERR_INV_LENGTH);
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goto unwraperror;
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}
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keylen = wrappedkeylen - 8;
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key = xtrymalloc_secure (keylen);
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if (!key)
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{
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err = gpg_error_from_syserror ();
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goto unwraperror;
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}
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err = gcry_cipher_decrypt (cipherhd, key, keylen, wrappedkey, wrappedkeylen);
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if (err)
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goto unwraperror;
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realkeylen = gcry_sexp_canon_len (key, keylen, NULL, &err);
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if (!realkeylen)
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goto unwraperror; /* Invalid csexp. */
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err = gcry_sexp_sscan (&s_skey, NULL, key, realkeylen);
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if (!err)
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{
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err = transfer_format_to_openpgp (s_skey, pk);
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gcry_sexp_release (s_skey);
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}
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unwraperror:
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xfree (key);
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xfree (wrappedkey);
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if (err)
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{
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log_error ("key %s: error receiving key from agent:"
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" %s%s\n", hexgrip, gpg_strerror (err),
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gpg_err_code (err) == GPG_ERR_FULLY_CANCELED?
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"":_(" - skipped"));
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}
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return err;
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}
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/* Export the keys identified by the list of strings in USERS to the
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stream OUT. If Secret is false public keys will be exported. With
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secret true secret keys will be exported; in this case 1 means the
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@ -1203,83 +1275,24 @@ do_export_stream (ctrl_t ctrl, iobuf_t out, strlist_t users, int secret,
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}
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else if (!err)
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{
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/* FIXME: Move this spaghetti code into a separate
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function. */
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unsigned char *wrappedkey = NULL;
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size_t wrappedkeylen;
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unsigned char *key = NULL;
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size_t keylen, realkeylen;
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gcry_sexp_t s_skey;
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if (opt.verbose)
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log_info ("key %s: asking agent for the secret parts\n",
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keystr_with_sub (keyid, subkid));
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{
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char *prompt = gpg_format_keydesc (pk,
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FORMAT_KEYDESC_EXPORT,1);
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err = agent_export_key (ctrl, hexgrip, prompt, &cache_nonce,
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&wrappedkey, &wrappedkeylen);
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xfree (prompt);
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}
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if (err)
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goto unwraperror;
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if (wrappedkeylen < 24)
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{
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err = gpg_error (GPG_ERR_INV_LENGTH);
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goto unwraperror;
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}
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keylen = wrappedkeylen - 8;
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key = xtrymalloc_secure (keylen);
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if (!key)
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{
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err = gpg_error_from_syserror ();
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goto unwraperror;
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}
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err = gcry_cipher_decrypt (cipherhd, key, keylen,
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wrappedkey, wrappedkeylen);
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if (err)
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goto unwraperror;
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realkeylen = gcry_sexp_canon_len (key, keylen, NULL, &err);
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if (!realkeylen)
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goto unwraperror; /* Invalid csexp. */
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err = gcry_sexp_sscan (&s_skey, NULL, key, realkeylen);
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xfree (key);
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key = NULL;
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if (err)
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goto unwraperror;
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err = transfer_format_to_openpgp (s_skey, pk);
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gcry_sexp_release (s_skey);
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if (err)
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goto unwraperror;
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err = build_packet (out, node->pkt);
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if (!err && node->pkt->pkttype == PKT_PUBLIC_KEY)
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{
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stats->exported++;
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print_status_exported (node->pkt->pkt.public_key);
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}
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goto unwraperror_leave;
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unwraperror:
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xfree (wrappedkey);
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xfree (key);
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err = receive_seckey_from_agent (ctrl, cipherhd, &cache_nonce,
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hexgrip, pk);
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if (err)
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{
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log_error ("key %s: error receiving key from agent:"
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" %s%s\n",
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keystr_with_sub (keyid, subkid),
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gpg_strerror (err),
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gpg_err_code (err) == GPG_ERR_FULLY_CANCELED?
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"":_(" - skipped"));
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if (gpg_err_code (err) == GPG_ERR_FULLY_CANCELED)
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goto leave;
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skip_until_subkey = 1;
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err = 0;
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}
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unwraperror_leave:
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;
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else
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{
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err = build_packet (out, node->pkt);
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if (node->pkt->pkttype == PKT_PUBLIC_KEY)
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{
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stats->exported++;
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print_status_exported (node->pkt->pkt.public_key);
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}
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}
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}
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else
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{
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