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wks: Try to send an encrypted confirmation back.
* tools/gpg-wks-client.c (encrypt_response_status_cb): New. (encrypt_response): New. (send_confirmation_response): Encrypt the response. * tools/gpg-wks-server.c (send_confirmation_request): Use freeing of BODY and BODYENC. Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch
parent
d3837e0435
commit
5de41c4ece
@ -452,14 +452,104 @@ command_send (const char *fingerprint, char *userid)
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static void
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encrypt_response_status_cb (void *opaque, const char *keyword, char *args)
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{
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gpg_error_t *failure = opaque;
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char *fields[2];
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if (opt.debug)
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log_debug ("%s: %s\n", keyword, args);
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if (!strcmp (keyword, "FAILURE"))
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{
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if (split_fields (args, fields, DIM (fields)) >= 2
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&& !strcmp (fields[0], "encrypt"))
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*failure = strtoul (fields[1], NULL, 10);
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}
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}
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/* Encrypt the INPUT stream to a new stream which is stored at success
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* at R_OUTPUT. Encryption is done for ADDRSPEC. We currently
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* retrieve that key from the WKD, DANE, or from "local". "local" is
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* last to prefer the latest key version but use a local copy in case
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* we are working offline. It might be useful for the server to send
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* the fingerprint of its encryption key - or even the entire key
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* back. */
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static gpg_error_t
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encrypt_response (estream_t *r_output, estream_t input, const char *addrspec)
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{
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gpg_error_t err;
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ccparray_t ccp;
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const char **argv;
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estream_t output;
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gpg_error_t gpg_err = 0;
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*r_output = NULL;
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output = es_fopenmem (0, "w+b");
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if (!output)
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{
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err = gpg_error_from_syserror ();
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log_error ("error allocating memory buffer: %s\n", gpg_strerror (err));
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return err;
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}
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ccparray_init (&ccp, 0);
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ccparray_put (&ccp, "--no-options");
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if (!opt.verbose)
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ccparray_put (&ccp, "--quiet");
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else if (opt.verbose > 1)
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ccparray_put (&ccp, "--verbose");
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ccparray_put (&ccp, "--batch");
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ccparray_put (&ccp, "--status-fd=2");
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ccparray_put (&ccp, "--always-trust");
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ccparray_put (&ccp, "--armor");
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ccparray_put (&ccp, "--auto-key-locate=clear,wkd,dane,local");
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ccparray_put (&ccp, "--recipient");
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ccparray_put (&ccp, addrspec);
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ccparray_put (&ccp, "--encrypt");
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ccparray_put (&ccp, "--");
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ccparray_put (&ccp, NULL);
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argv = ccparray_get (&ccp, NULL);
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if (!argv)
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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err = gnupg_exec_tool_stream (opt.gpg_program, argv, input,
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NULL, output,
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encrypt_response_status_cb, &gpg_err);
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if (err)
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{
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if (gpg_err)
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err = gpg_err;
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log_error ("encryption failed: %s\n", gpg_strerror (err));
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goto leave;
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}
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es_rewind (output);
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*r_output = output;
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output = NULL;
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leave:
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es_fclose (output);
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xfree (argv);
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return err;
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}
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static gpg_error_t
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send_confirmation_response (const char *sender, const char *address,
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const char *nonce)
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const char *nonce, int encrypt)
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{
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gpg_error_t err;
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estream_t body = NULL;
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/* FIXME: Encrypt and sign the response. */
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/* estream_t bodyenc = NULL; */
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estream_t bodyenc = NULL;
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mime_maker_t mime = NULL;
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body = es_fopenmem (0, "w+b");
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@ -469,12 +559,16 @@ send_confirmation_response (const char *sender, const char *address,
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log_error ("error allocating memory buffer: %s\n", gpg_strerror (err));
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return err;
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}
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/* It is fine to use 8 bit encosind because that is encrypted and
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/* It is fine to use 8 bit encoding because that is encrypted and
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* only our client will see it. */
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/* es_fputs ("Content-Type: application/vnd.gnupg.wks\n" */
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/* "Content-Transfer-Encoding: 8bit\n" */
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/* "\n", */
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/* body); */
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if (encrypt)
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{
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es_fputs ("Content-Type: application/vnd.gnupg.wks\n"
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"Content-Transfer-Encoding: 8bit\n"
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"\n",
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body);
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}
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es_fprintf (body, ("type: confirmation-response\n"
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"sender: %s\n"
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@ -485,12 +579,14 @@ send_confirmation_response (const char *sender, const char *address,
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nonce);
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es_rewind (body);
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/* err = encrypt_stream (&bodyenc, body, ctx->fpr); */
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/* if (err) */
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/* goto leave; */
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/* es_fclose (body); */
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/* body = NULL; */
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if (encrypt)
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{
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err = encrypt_response (&bodyenc, body, address);
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if (err)
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goto leave;
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es_fclose (body);
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body = NULL;
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}
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err = mime_maker_new (&mime, NULL);
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if (err)
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@ -505,42 +601,50 @@ send_confirmation_response (const char *sender, const char *address,
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if (err)
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goto leave;
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/* err = mime_maker_add_header (mime, "Content-Type", */
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/* "multipart/encrypted; " */
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/* "protocol=\"application/pgp-encrypted\""); */
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/* if (err) */
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/* goto leave; */
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/* err = mime_maker_add_container (mime, "multipart/encrypted"); */
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/* if (err) */
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/* goto leave; */
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if (encrypt)
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{
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err = mime_maker_add_header (mime, "Content-Type",
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"multipart/encrypted; "
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"protocol=\"application/pgp-encrypted\"");
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if (err)
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goto leave;
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err = mime_maker_add_container (mime, "multipart/encrypted");
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if (err)
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goto leave;
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/* err = mime_maker_add_header (mime, "Content-Type", */
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/* "application/pgp-encrypted"); */
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/* if (err) */
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/* goto leave; */
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/* err = mime_maker_add_body (mime, "Version: 1\n"); */
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/* if (err) */
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/* goto leave; */
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/* err = mime_maker_add_header (mime, "Content-Type", */
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/* "application/octet-stream"); */
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/* if (err) */
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/* goto leave; */
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err = mime_maker_add_header (mime, "Content-Type",
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"application/pgp-encrypted");
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if (err)
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goto leave;
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err = mime_maker_add_body (mime, "Version: 1\n");
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if (err)
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goto leave;
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err = mime_maker_add_header (mime, "Content-Type",
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"application/octet-stream");
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if (err)
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goto leave;
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err = mime_maker_add_header (mime, "Content-Type",
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"application/vnd.gnupg.wks");
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if (err)
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goto leave;
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err = mime_maker_add_stream (mime, &body);
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if (err)
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goto leave;
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err = mime_maker_add_stream (mime, &bodyenc);
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if (err)
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goto leave;
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}
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else
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{
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err = mime_maker_add_header (mime, "Content-Type",
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"application/vnd.gnupg.wks");
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if (err)
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goto leave;
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err = mime_maker_add_stream (mime, &body);
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if (err)
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goto leave;
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}
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err = wks_send_mime (mime);
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leave:
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mime_maker_release (mime);
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/* xfree (bodyenc); */
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xfree (body);
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es_fclose (bodyenc);
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es_fclose (body);
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return err;
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}
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@ -619,8 +723,14 @@ process_confirmation_request (estream_t msg)
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}
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nonce = value;
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err = send_confirmation_response (sender, address, nonce);
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/* Send the confirmation. If no key was found, try again without
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* encryption. */
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err = send_confirmation_response (sender, address, nonce, 1);
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if (gpg_err_code (err) == GPG_ERR_NO_PUBKEY)
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{
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log_info ("no encryption key found - sending response in the clear\n");
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err = send_confirmation_response (sender, address, nonce, 0);
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}
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leave:
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nvc_release (nvc);
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@ -904,8 +904,8 @@ send_confirmation_request (server_ctx_t ctx,
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leave:
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mime_maker_release (mime);
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xfree (bodyenc);
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xfree (body);
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es_fclose (bodyenc);
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es_fclose (body);
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xfree (from_buffer);
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return err;
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}
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