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dirmngr: First take on ntbtls cert verification.

Browse Source 
* dirmngr/http-ntbtls.c: New.
* dirmngr/Makefile.am (dirmngr_SOURCES): Add file.
* dirmngr/dirmngr.h (SERVER_CONTROL_MAGIC): New.
(server_conrol_s): Add field 'magic',
* dirmngr/dirmngr.c (dirmngr_init_default_ctrl): Set MAGIC.
(dirmngr_deinit_default_ctrl): Set MAGIC to deadbeef.
* dirmngr/http.c (my_ntbtls_verify_cb): New.
(http_session_new) [HTTP_USE_NTBTLS]: Remove all CA setting code.
(send_request) [HTTP_USE_NTBTLS]: Set the verify callback.  Do not call
the verify callback after the handshake.
* dirmngr/ks-engine-hkp.c (send_request): Pass
gnupg_http_tls_verify_cb to http_session_new.
* dirmngr/ks-engine-http.c (ks_http_fetch): Ditto.

* dirmngr/t-http.c (my_http_tls_verify_cb): New.
(main): Rename option --gnutls-debug to --tls-debug.
(main) [HTTP_USE_NTBTLS]: Create a session.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2017-02-19 10:36:43 +01:00
parent a74902cccd
commit 64fffd0ce2
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
8 changed files with 233 additions and 93 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
dirmngr/Makefile.am
View File

@ -62,6 +62,7 @@ dirmngr_SOURCES = dirmngr.c dirmngr.h server.c crlcache.c crlfetch.c \
ocsp.c ocsp.h validate.c validate.h \
dns-stuff.c dns-stuff.h \
http.c http.h \
http-ntbtls.c \
ks-action.c ks-action.h ks-engine.h \
ks-engine-hkp.c ks-engine-http.c ks-engine-finger.c ks-engine-kdns.c

3
dirmngr/dirmngr.c
View File

@ -1468,6 +1468,7 @@ dirmngr_exit (int rc)
void
dirmngr_init_default_ctrl (ctrl_t ctrl)
{
ctrl->magic = SERVER_CONTROL_MAGIC;
if (opt.http_proxy)
ctrl->http_proxy = xstrdup (opt.http_proxy);
}
@ -1478,6 +1479,8 @@ dirmngr_deinit_default_ctrl (ctrl_t ctrl)
{
if (!ctrl)
return;
ctrl->magic = 0xdeadbeef;
xfree (ctrl->http_proxy);
ctrl->http_proxy = NULL;
}

22
dirmngr/dirmngr.h
View File

@ -168,12 +168,19 @@ typedef struct cert_ref_s *cert_ref_t;
/* Forward references; access only through server.c. */
struct server_local_s;
#if SIZEOF_UNSIGNED_LONG == 8
# define SERVER_CONTROL_MAGIC 0x6469726d6e677220
#else
# define SERVER_CONTROL_MAGIC 0x6469726d
#endif
/* Connection control structure. */
struct server_control_s
{
int refcount; /* Count additional references to this object. */
int no_server; /* We are not running under server control. */
int status_fd; /* Only for non-server mode. */
unsigned long magic;/* Always has SERVER_CONTROL_MAGIC. */
int refcount; /* Count additional references to this object. */
int no_server; /* We are not running under server control. */
int status_fd; /* Only for non-server mode. */
struct server_local_s *server_local;
int force_crl_refresh; /* Always load a fresh CRL. */
@ -213,6 +220,15 @@ gpg_error_t dirmngr_status (ctrl_t ctrl, const char *keyword, ...);
gpg_error_t dirmngr_status_help (ctrl_t ctrl, const char *text);
gpg_error_t dirmngr_tick (ctrl_t ctrl);
/*-- http-ntbtls.c --*/
/* Note that we don't use a callback for gnutls. */
gpg_error_t gnupg_http_tls_verify_cb (void *opaque,
http_t http,
http_session_t session,
unsigned int flags,
void *tls_context);
/*-- loadswdb.c --*/
gpg_error_t dirmngr_load_swdb (ctrl_t ctrl, int force);

109
dirmngr/http-ntbtls.c Normal file
View File

@ -0,0 +1,109 @@
/* http-ntbtls.c - Support for using NTBTLS with http.c
* Copyright (C) 2017 Werner Koch
*
* 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 "dirmngr.h"
#include "certcache.h"
#include "validate.h"
#ifdef HTTP_USE_NTBTLS
# include <ntbtls.h>
/* The callback used to verify the peer's certificate. */
gpg_error_t
gnupg_http_tls_verify_cb (void *opaque,
http_t http,
http_session_t session,
unsigned int http_flags,
void *tls_context)
{
ctrl_t ctrl = opaque;
gpg_error_t err;
int idx;
ksba_cert_t cert;
ksba_cert_t hostcert = NULL;
unsigned int validate_flags;
(void)http;
(void)session;
log_assert (ctrl && ctrl->magic == SERVER_CONTROL_MAGIC);
/* Get the peer's certs fron ntbtls. */
for (idx = 0;
(cert = ntbtls_x509_get_peer_cert (tls_context, idx)); idx++)
{
if (!idx)
hostcert = cert;
else
{
/* Quick hack to make verification work by inserting the supplied
* certs into the cache. FIXME! */
cache_cert (cert);
ksba_cert_release (cert);
}
}
if (!idx)
{
err = gpg_error (GPG_ERR_MISSING_CERT);
goto leave;
}
validate_flags = VALIDATE_FLAG_TLS;
/* if ((http_flags & HTTP_FLAG_TRUST_DEF)) */
/* validate_flags |= VALIDATE_FLAG_??; */
if ((http_flags & HTTP_FLAG_TRUST_SYS))
validate_flags |= VALIDATE_FLAG_SYSTRUST;
/* FIXME: For now we don't use CRLs. */
validate_flags |= VALIDATE_FLAG_NOCRLCHECK;
err = validate_cert_chain (ctrl, hostcert, NULL, validate_flags, NULL);
leave:
ksba_cert_release (hostcert);
return err;
}
#else /*!HTTP_USE_NTBTLS*/
/* Dummy function used when not build without ntbtls support. */
gpg_error_t
gnupg_http_tls_verify_cb (void *opaque,
http_t http,
http_session_t session,
unsigned int flags,
void *tls_context)
{
(void)opaque;
(void)http;
(void)session;
(void)flags;
(void)tls_context;
return gpg_error (GPG_ERR_NOT_IMPLEMENTED);
}
#endif /*!HTTP_USE_NTBTLS*/

121
dirmngr/http.c
View File

@ -413,6 +413,21 @@ my_gnutls_write (gnutls_transport_ptr_t ptr, const void *buffer, size_t size)
#endif /*HTTP_USE_GNUTLS*/
#ifdef HTTP_USE_NTBTLS
/* Connect the ntbls callback to our generic callback. */
static gpg_error_t
my_ntbtls_verify_cb (void *opaque, ntbtls_t tls, unsigned int verify_flags)
{
http_t hd = opaque;
log_assert (hd && hd->session && hd->session->verify_cb);
return hd->session->verify_cb (hd->session->verify_cb_value,
hd, hd->session,
(hd->flags | hd->session->flags),
tls);
}
#endif /*HTTP_USE_NTBTLS*/
/* This notification function is called by estream whenever stream is
@ -632,91 +647,16 @@ http_session_new (http_session_t *r_session,
#if HTTP_USE_NTBTLS
{
x509_cert_t ca_chain;
char line[256];
estream_t fp, mem_p;
size_t nread, nbytes;
struct b64state state;
void *buf;
size_t buflen;
char *pemname;
pemname = make_filename_try (gnupg_datadir (),
"sks-keyservers.netCA.pem", NULL);
if (!pemname)
{
err = gpg_error_from_syserror ();
log_error ("setting CA from file '%s' failed: %s\n",
pemname, gpg_strerror (err));
goto leave;
}
fp = es_fopen (pemname, "r");
if (!fp)
{
err = gpg_error_from_syserror ();
log_error ("can't open '%s': %s\n", pemname, gpg_strerror (err));
xfree (pemname);
goto leave;
}
xfree (pemname);
mem_p = es_fopenmem (0, "r+b");
err = b64dec_start (&state, "CERTIFICATE");
if (err)
{
log_error ("b64dec failure: %s\n", gpg_strerror (err));
goto leave;
}
while ( (nread = es_fread (line, 1, DIM (line), fp)) )
{
err = b64dec_proc (&state, line, nread, &nbytes);
if (err)
{
if (gpg_err_code (err) == GPG_ERR_EOF)
break;
log_error ("b64dec failure: %s\n", gpg_strerror (err));
es_fclose (fp);
es_fclose (mem_p);
goto leave;
}
else if (nbytes)
es_fwrite (line, 1, nbytes, mem_p);
}
err = b64dec_finish (&state);
if (err)
{
log_error ("b64dec failure: %s\n", gpg_strerror (err));
es_fclose (fp);
es_fclose (mem_p);
goto leave;
}
es_fclose_snatch (mem_p, &buf, &buflen);
es_fclose (fp);
err = ntbtls_x509_cert_new (&ca_chain);
if (err)
{
log_error ("ntbtls_x509_new failed: %s\n", gpg_strerror (err));
xfree (buf);
goto leave;
}
err = ntbtls_x509_append_cert (ca_chain, buf, buflen);
xfree (buf);
(void)intended_hostname; /* Not needed because we do not preload
* certificates. */
err = ntbtls_new (&sess->tls_session, NTBTLS_CLIENT);
if (err)
{
log_error ("ntbtls_new failed: %s\n", gpg_strerror (err));
ntbtls_x509_cert_release (ca_chain);
goto leave;
}
err = ntbtls_set_ca_chain (sess->tls_session, ca_chain, NULL);
}
#elif HTTP_USE_GNUTLS
{
@ -1819,6 +1759,21 @@ send_request (http_t hd, const char *httphost, const char *auth,
return err;
}
#ifdef HTTP_USE_NTBTLS
if (hd->session->verify_cb)
{
err = ntbtls_set_verify_cb (hd->session->tls_session,
my_ntbtls_verify_cb, hd);
if (err)
{
log_error ("ntbtls_set_verify_cb failed: %s\n",
gpg_strerror (err));
xfree (proxy_authstr);
return err;
}
}
#endif /*HTTP_USE_NTBTLS*/
while ((err = ntbtls_handshake (hd->session->tls_session)))
{
switch (err)
@ -1833,12 +1788,18 @@ send_request (http_t hd, const char *httphost, const char *auth,
hd->session->verify.done = 0;
/* Try the available verify callbacks until one returns success
* or a real error. */
* or a real error. Note that NTBTLS does the verification
* during the handshake via */
#ifdef HTTP_USE_NTBTLS
err = 0; /* Fixme check that the CB has been called. */
#else
err = gpg_error (GPG_ERR_NOT_IMPLEMENTED);
#endif
if (hd->session->verify_cb)
if (hd->session->verify_cb
&& gpg_err_source (err) == GPG_ERR_SOURCE_DIRMNGR
&& gpg_err_code (err) == GPG_ERR_NOT_IMPLEMENTED)
err = hd->session->verify_cb (hd->session->verify_cb_value,
hd, hd->session,
(hd->flags | hd->session->flags),

2
dirmngr/ks-engine-hkp.c
View File

@ -1124,7 +1124,7 @@ send_request (ctrl_t ctrl, const char *request, const char *hostportstr,
*r_fp = NULL;
err = http_session_new (&session, httphost, HTTP_FLAG_TRUST_DEF,
NULL, ctrl);
gnupg_http_tls_verify_cb, ctrl);
if (err)
goto leave;
http_session_set_log_cb (session, cert_log_cb);

2
dirmngr/ks-engine-http.c
View File

@ -77,7 +77,7 @@ ks_http_fetch (ctrl_t ctrl, const char *url, estream_t *r_fp)
/* Note that we only use the system provided certificates with the
* fetch command. */
err = http_session_new (&session, NULL, HTTP_FLAG_TRUST_SYS,
NULL, ctrl);
gnupg_http_tls_verify_cb, ctrl);
if (err)
goto leave;
http_session_set_log_cb (session, cert_log_cb);

66
dirmngr/t-http.c
View File

@ -42,7 +42,6 @@
#include "logging.h"
#include "http.h"
#if HTTP_USE_NTBTLS
# include <ntbtls.h>
#elif HTTP_USE_GNUTLS
@ -118,6 +117,56 @@ my_gnutls_log (int level, const char *text)
}
#endif
static gpg_error_t
my_http_tls_verify_cb (void *opaque,
http_t http,
http_session_t session,
unsigned int http_flags,
void *tls_context)
{
gpg_error_t err;
int idx;
ksba_cert_t cert;
ksba_cert_t hostcert = NULL;
(void)opaque;
(void)http;
(void)session;
/* Get the peer's certs fron ntbtls. */
for (idx = 0;
(cert = ntbtls_x509_get_peer_cert (tls_context, idx)); idx++)
{
if (!idx)
{
log_info ("Received host certificate\n");
hostcert = cert;
}
else
{
log_info ("Received additional certificate\n");
ksba_cert_release (cert);
}
}
if (!idx)
{
err = gpg_error (GPG_ERR_MISSING_CERT);
goto leave;
}
err = 0;
leave:
ksba_cert_release (hostcert);
log_info ("my_http_tls_verify_cb returns: %s\n", gpg_strerror (err));
return err;
}
/* Prepend FNAME with the srcdir environment variable's value and
return an allocated filename. */
static char *
@ -142,8 +191,7 @@ main (int argc, char **argv)
{
int last_argc = -1;
gpg_error_t err;
int rc;
parsed_uri_t uri;
int rc; parsed_uri_t uri;
uri_tuple_t r;
http_t hd;
int c;
@ -171,7 +219,7 @@ main (int argc, char **argv)
"Options:\n"
" --verbose print timings etc.\n"
" --debug flyswatter\n"
" --gnutls-debug N use GNUTLS debug level N\n"
" --tls-debug N use TLS debug level N\n"
" --cacert FNAME expect CA certificate in file FNAME\n"
" --no-verify do not verify the certificate\n"
" --force-tls use HTTP_FLAG_FORCE_TLS\n"
@ -191,7 +239,7 @@ main (int argc, char **argv)
debug++;
argc--; argv++;
}
else if (!strcmp (*argv, "--gnutls-debug"))
else if (!strcmp (*argv, "--tls-debug"))
{
argc--; argv++;
if (argc)
@ -248,9 +296,11 @@ main (int argc, char **argv)
assuan_sock_init ();
#if HTTP_USE_NTBTLS
(void)err;
log_info ("new session.\n");
err = http_session_new (&session, NULL, HTTP_FLAG_TRUST_DEF,
my_http_tls_verify_cb, NULL);
if (err)
log_error ("http_session_new failed: %s\n", gpg_strerror (err));
ntbtls_set_debug (tls_dbg, NULL, NULL);
#elif HTTP_USE_GNUTLS