const std::string GnuTLSBase::channelBinding() const
{
#ifdef HAVE_GNUTLS_SESSION_CHANNEL_BINDING
gnutls_datum_t cb;
int rc;
rc = gnutls_session_channel_binding( *m_session, GNUTLS_CB_TLS_UNIQUE, &cb );
if( !rc )
return std::string( (char*)cb.data, cb.size );
else
#endif
return EmptyString;
}
static int
tlsg_session_unique( tls_session *sess, struct berval *buf, int is_server)
{
tlsg_session *s = (tlsg_session *)sess;
gnutls_datum_t cb;
int rc;
rc = gnutls_session_channel_binding( s->session, GNUTLS_CB_TLS_UNIQUE, &cb );
if ( rc == 0 ) {
int len = cb.size;
if ( len > buf->bv_len )
len = buf->bv_len;
buf->bv_len = len;
memcpy( buf->bv_val, cb.data, len );
return len;
}
return 0;
}
static int
tlsg_session_unique( tls_session *sess, struct berval *buf, int is_server)
{
/* channel bindings added in 2.12.0 */
#if GNUTLS_VERSION_NUMBER >= 0x020c00
tlsg_session *s = (tlsg_session *)sess;
gnutls_datum_t cb;
int rc;
rc = gnutls_session_channel_binding( s->session, GNUTLS_CB_TLS_UNIQUE, &cb );
if ( rc == 0 ) {
int len = cb.size;
if ( len > buf->bv_len )
len = buf->bv_len;
buf->bv_len = len;
memcpy( buf->bv_val, cb.data, len );
return len;
}
#endif
return 0;
}
int
print_info (gnutls_session_t session, int print_cert)
{
const char *tmp;
gnutls_credentials_type_t cred;
gnutls_kx_algorithm_t kx;
unsigned char session_id[33];
size_t session_id_size = sizeof (session_id);
/* print session ID */
gnutls_session_get_id (session, session_id, &session_id_size);
printf ("- Session ID: %s\n",
raw_to_string (session_id, session_id_size));
/* print the key exchange's algorithm name
*/
kx = gnutls_kx_get (session);
cred = gnutls_auth_get_type (session);
switch (cred)
{
#ifdef ENABLE_ANON
case GNUTLS_CRD_ANON:
if (kx == GNUTLS_KX_ANON_ECDH)
print_ecdh_info (session, "Anonymous ");
else
print_dh_info (session, "Anonymous ", verbose);
break;
#endif
#ifdef ENABLE_SRP
case GNUTLS_CRD_SRP:
/* This should be only called in server
* side.
*/
if (gnutls_srp_server_get_username (session) != NULL)
printf ("- SRP authentication. Connected as '%s'\n",
gnutls_srp_server_get_username (session));
break;
#endif
#ifdef ENABLE_PSK
case GNUTLS_CRD_PSK:
/* This returns NULL in server side.
*/
if (gnutls_psk_client_get_hint (session) != NULL)
printf ("- PSK authentication. PSK hint '%s'\n",
gnutls_psk_client_get_hint (session));
/* This returns NULL in client side.
*/
if (gnutls_psk_server_get_username (session) != NULL)
printf ("- PSK authentication. Connected as '%s'\n",
gnutls_psk_server_get_username (session));
if (kx == GNUTLS_KX_DHE_PSK)
print_dh_info (session, "Ephemeral ", verbose);
if (kx == GNUTLS_KX_ECDHE_PSK)
print_ecdh_info (session, "Ephemeral ");
break;
#endif
case GNUTLS_CRD_IA:
printf ("- TLS/IA authentication\n");
break;
case GNUTLS_CRD_CERTIFICATE:
{
char dns[256];
size_t dns_size = sizeof (dns);
unsigned int type;
/* This fails in client side */
if (gnutls_server_name_get
(session, dns, &dns_size, &type, 0) == 0)
{
printf ("- Given server name[%d]: %s\n", type, dns);
}
}
print_cert_info (session,
verbose?GNUTLS_CRT_PRINT_FULL:GNUTLS_CRT_PRINT_COMPACT,
print_cert);
if (kx == GNUTLS_KX_DHE_RSA || kx == GNUTLS_KX_DHE_DSS)
print_dh_info (session, "Ephemeral ", verbose);
else if (kx == GNUTLS_KX_ECDHE_RSA
|| kx == GNUTLS_KX_ECDHE_ECDSA)
print_ecdh_info (session, "Ephemeral ");
}
tmp =
SU (gnutls_protocol_get_name
(gnutls_protocol_get_version (session)));
printf ("- Version: %s\n", tmp);
tmp = SU (gnutls_kx_get_name (kx));
printf ("- Key Exchange: %s\n", tmp);
tmp = SU (gnutls_cipher_get_name (gnutls_cipher_get (session)));
printf ("- Cipher: %s\n", tmp);
tmp = SU (gnutls_mac_get_name (gnutls_mac_get (session)));
printf ("- MAC: %s\n", tmp);
tmp =
SU (gnutls_compression_get_name
(gnutls_compression_get (session)));
printf ("- Compression: %s\n", tmp);
if (verbose)
{
gnutls_datum_t cb;
int rc;
rc = gnutls_session_channel_binding (session,
GNUTLS_CB_TLS_UNIQUE, &cb);
if (rc)
fprintf (stderr, "Channel binding error: %s\n",
gnutls_strerror (rc));
else
{
size_t i;
printf ("- Channel binding 'tls-unique': ");
for (i = 0; i < cb.size; i++)
printf ("%02x", cb.data[i]);
printf ("\n");
}
}
/* Warning: Do not print anything more here. The 'Compression:'
output MUST be the last non-verbose output. This is used by
Emacs starttls.el code. */
fflush (stdout);
return 0;
}
int
main (int argc, char *argv[])
{
Gsasl *ctx = NULL;
int res;
char *in;
char *connect_hostname = NULL;
char *connect_service = NULL;
#ifdef HAVE_LIBGNUTLS
gnutls_anon_client_credentials anoncred;
gnutls_certificate_credentials x509cred;
#endif
set_program_name (argv[0]);
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
/* This is necessary for modern MinGW compilers that provide working
getaddrinfo function, which results in gnulib not detecting that
it is broken. The proper fix is for gnulib to wrap the
getaddrinfo call and initialize Windows sockets in the
wrapper. */
(void) gl_sockets_startup (SOCKETS_1_1);
if (cmdline_parser (argc, argv, &args_info) != 0)
return EXIT_FAILURE;
if (args_info.version_given)
{
const char *p = PACKAGE_NAME;
if (strcmp (gsasl_check_version (NULL), PACKAGE_VERSION) != 0)
p = PACKAGE_STRING;
version_etc (stdout, "gsasl", p, gsasl_check_version (NULL),
"Simon Josefsson", (char *) NULL);
return EXIT_SUCCESS;
}
if (args_info.help_given)
usage (EXIT_SUCCESS);
if (!(args_info.client_flag || args_info.client_given) &&
!args_info.server_given &&
!args_info.client_mechanisms_flag && !args_info.server_mechanisms_flag)
{
error (0, 0, _("missing argument"));
usage (EXIT_FAILURE);
}
if ((args_info.x509_cert_file_arg && !args_info.x509_key_file_arg) ||
(!args_info.x509_cert_file_arg && args_info.x509_key_file_arg))
error (EXIT_FAILURE, 0,
_("need both --x509-cert-file and --x509-key-file"));
if (args_info.starttls_flag && args_info.no_starttls_flag)
error (EXIT_FAILURE, 0,
_("cannot use both --starttls and --no-starttls"));
if (args_info.smtp_flag && args_info.imap_flag)
error (EXIT_FAILURE, 0, _("cannot use both --smtp and --imap"));
if (!args_info.connect_given && args_info.inputs_num == 0 &&
!args_info.client_given && !args_info.server_given &&
!args_info.client_mechanisms_flag && !args_info.server_mechanisms_flag)
{
cmdline_parser_print_help ();
emit_bug_reporting_address ();
return EXIT_SUCCESS;
}
if (args_info.connect_given)
{
if (strrchr (args_info.connect_arg, ':'))
{
connect_hostname = xstrdup (args_info.connect_arg);
*strrchr (connect_hostname, ':') = '\0';
connect_service =
xstrdup (strrchr (args_info.connect_arg, ':') + 1);
}
else
{
connect_hostname = xstrdup (args_info.connect_arg);
if (args_info.smtp_flag)
connect_service = xstrdup ("smtp");
else
connect_service = xstrdup ("imap");
}
}
else if (args_info.inputs_num > 0)
{
connect_hostname = args_info.inputs[0];
if (args_info.inputs_num > 1)
connect_service = args_info.inputs[1];
else if (args_info.smtp_flag)
connect_service = xstrdup ("smtp");
else
connect_service = xstrdup ("imap");
}
if (connect_service && !args_info.smtp_flag && !args_info.imap_flag)
{
if (strcmp (connect_service, "25") == 0 ||
strcmp (connect_service, "smtp") == 0)
args_info.smtp_flag = 1;
else
args_info.imap_flag = 1;
}
if (args_info.imap_flag && !args_info.service_given)
args_info.service_arg = xstrdup ("imap");
if (args_info.smtp_flag && !args_info.service_given)
args_info.service_arg = xstrdup ("smtp");
if (args_info.imap_flag || args_info.smtp_flag)
args_info.no_client_first_flag = 1;
if (connect_hostname && !args_info.hostname_arg)
args_info.hostname_arg = xstrdup (connect_hostname);
if (!isatty (STDOUT_FILENO))
setvbuf (stdout, NULL, _IOLBF, BUFSIZ);
res = gsasl_init (&ctx);
if (res != GSASL_OK)
error (EXIT_FAILURE, 0, _("initialization failure: %s"),
gsasl_strerror (res));
gsasl_callback_set (ctx, callback);
if (args_info.client_mechanisms_flag || args_info.server_mechanisms_flag)
{
char *mechs;
if (args_info.client_mechanisms_flag)
res = gsasl_client_mechlist (ctx, &mechs);
else
res = gsasl_server_mechlist (ctx, &mechs);
if (res != GSASL_OK)
error (EXIT_FAILURE, 0, _("error listing mechanisms: %s"),
gsasl_strerror (res));
if (!args_info.quiet_given)
{
if (args_info.client_mechanisms_flag)
fprintf (stderr,
_("This client supports the following mechanisms:\n"));
else
fprintf (stderr,
_("This server supports the following mechanisms:\n"));
}
fprintf (stdout, "%s\n", mechs);
free (mechs);
return EXIT_SUCCESS;
}
if (args_info.connect_given || args_info.inputs_num > 0)
{
struct addrinfo hints;
struct addrinfo *ai0, *ai;
memset (&hints, 0, sizeof (hints));
hints.ai_flags = AI_CANONNAME;
hints.ai_socktype = SOCK_STREAM;
res = getaddrinfo (connect_hostname, connect_service, &hints, &ai0);
if (res != 0)
error (EXIT_FAILURE, 0, "%s: %s", connect_hostname,
gai_strerror (res));
for (ai = ai0; ai; ai = ai->ai_next)
{
fprintf (stderr, "Trying %s...\n", quote (ai->ai_canonname ?
ai->ai_canonname :
connect_hostname));
sockfd = socket (ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (sockfd < 0)
{
error (0, errno, "socket");
continue;
}
if (connect (sockfd, ai->ai_addr, ai->ai_addrlen) < 0)
{
int save_errno = errno;
close (sockfd);
sockfd = -1;
error (0, save_errno, "connect");
continue;
}
break;
}
if (sockfd < 0)
error (EXIT_FAILURE, errno, "socket");
freeaddrinfo (ai);
}
if (!greeting ())
return 1;
#ifdef HAVE_LIBGNUTLS
if (sockfd && !args_info.no_starttls_flag &&
(args_info.starttls_flag || has_starttls ()))
{
res = gnutls_global_init ();
if (res < 0)
error (EXIT_FAILURE, 0, _("GnuTLS global initialization failed: %s"),
gnutls_strerror (res));
res = gnutls_init (&session, GNUTLS_CLIENT);
if (res < 0)
error (EXIT_FAILURE, 0, _("GnuTLS initialization failed: %s"),
gnutls_strerror (res));
res = gnutls_set_default_priority (session);
if (res < 0)
error (EXIT_FAILURE, 0, _("setting GnuTLS defaults failed: %s"),
gnutls_strerror (res));
res = gnutls_anon_allocate_client_credentials (&anoncred);
if (res < 0)
error (EXIT_FAILURE, 0,
_("allocating anonymous GnuTLS credential: %s"),
gnutls_strerror (res));
res = gnutls_credentials_set (session, GNUTLS_CRD_ANON, anoncred);
if (res < 0)
error (EXIT_FAILURE, 0, _("setting anonymous GnuTLS credential: %s"),
gnutls_strerror (res));
res = gnutls_certificate_allocate_credentials (&x509cred);
if (res < 0)
error (EXIT_FAILURE, 0, _("allocating X.509 GnuTLS credential: %s"),
gnutls_strerror (res));
if (args_info.x509_cert_file_arg && args_info.x509_key_file_arg)
res = gnutls_certificate_set_x509_key_file
(x509cred, args_info.x509_cert_file_arg,
args_info.x509_key_file_arg, GNUTLS_X509_FMT_PEM);
if (res != GNUTLS_E_SUCCESS)
error (EXIT_FAILURE, 0, _("loading X.509 GnuTLS credential: %s"),
gnutls_strerror (res));
if (args_info.x509_ca_file_arg)
{
res = gnutls_certificate_set_x509_trust_file
(x509cred, args_info.x509_ca_file_arg, GNUTLS_X509_FMT_PEM);
if (res < 0)
error (EXIT_FAILURE, 0, _("no X.509 CAs found: %s"),
gnutls_strerror (res));
if (res == 0)
error (EXIT_FAILURE, 0, _("no X.509 CAs found"));
}
res = gnutls_credentials_set (session, GNUTLS_CRD_CERTIFICATE,
x509cred);
if (res < 0)
error (EXIT_FAILURE, 0, _("setting X.509 GnuTLS credential: %s"),
gnutls_strerror (res));
if (args_info.priority_arg)
{
const char *err_pos;
res = gnutls_priority_set_direct (session, args_info.priority_arg,
&err_pos);
if (res < 0)
error (EXIT_FAILURE, 0,
_("setting GnuTLS cipher priority (%s): %s\n"),
gnutls_strerror (res), err_pos);
}
gnutls_transport_set_ptr (session, (gnutls_transport_ptr)
(unsigned long) sockfd);
if (!starttls ())
return 1;
res = gnutls_handshake (session);
if (res < 0)
error (EXIT_FAILURE, 0, _("GnuTLS handshake failed: %s"),
gnutls_strerror (res));
if (args_info.x509_ca_file_arg)
{
unsigned int status;
res = gnutls_certificate_verify_peers2 (session, &status);
if (res < 0)
error (EXIT_FAILURE, 0, _("verifying peer certificate: %s"),
gnutls_strerror (res));
if (status & GNUTLS_CERT_INVALID)
error (EXIT_FAILURE, 0, _("server certificate is not trusted"));
if (status & GNUTLS_CERT_SIGNER_NOT_FOUND)
error (EXIT_FAILURE, 0,
_("server certificate hasn't got a known issuer"));
if (status & GNUTLS_CERT_REVOKED)
error (EXIT_FAILURE, 0, _("server certificate has been revoked"));
if (status != 0)
error (EXIT_FAILURE, 0,
_("could not verify server certificate (rc=%d)"), status);
}
#if HAVE_GNUTLS_SESSION_CHANNEL_BINDING
if (!args_info.no_cb_flag)
{
gnutls_datum cb;
res = gnutls_session_channel_binding (session,
GNUTLS_CB_TLS_UNIQUE, &cb);
if (res != GNUTLS_E_SUCCESS)
error (EXIT_FAILURE, 0, _("getting channel binding failed: %s"),
gnutls_strerror (res));
res = gsasl_base64_to ((char *) cb.data, cb.size,
&b64cbtlsunique, NULL);
if (res != GSASL_OK)
error (EXIT_FAILURE, 0, "%s", gsasl_strerror (res));
}
#endif
using_tls = true;
}
#endif
if (args_info.client_flag || args_info.client_given
|| args_info.server_given)
{
char *out;
char *b64output;
size_t output_len;
size_t b64output_len;
const char *mech;
Gsasl_session *xctx = NULL;
if (!select_mechanism (&in))
return 1;
mech = gsasl_client_suggest_mechanism (ctx, in);
if (mech == NULL)
{
fprintf (stderr, _("Cannot find mechanism...\n"));
return 0;
}
if (args_info.mechanism_arg)
mech = args_info.mechanism_arg;
if (!authenticate (mech))
return 1;
/* Authenticate using mechanism */
if (args_info.server_flag)
res = gsasl_server_start (ctx, mech, &xctx);
else
res = gsasl_client_start (ctx, mech, &xctx);
if (res != GSASL_OK)
error (EXIT_FAILURE, 0, _("mechanism unavailable: %s"),
gsasl_strerror (res));
in = NULL;
out = NULL;
if (!args_info.server_flag && args_info.no_client_first_flag)
{
res = GSASL_NEEDS_MORE;
goto no_client_first;
}
do
{
int res2;
res = gsasl_step64 (xctx, in, &out);
if (res != GSASL_NEEDS_MORE && res != GSASL_OK)
break;
if (!step_send (out))
return 1;
no_client_first:
if (!args_info.quiet_given &&
!args_info.imap_flag && !args_info.smtp_flag)
{
if (args_info.server_flag)
fprintf (stderr, _("Enter base64 authentication data "
"from client (press RET if none):\n"));
else
fprintf (stderr, _("Enter base64 authentication data "
"from server (press RET if none):\n"));
}
/* Return 1 on token, 2 on protocol success, 3 on protocol fail, 0 on
errors. */
res2 = step_recv (&in);
if (!res2)
return 1;
if (res2 == 3)
error (EXIT_FAILURE, 0, _("server error"));
if (res2 == 2)
break;
}
while (args_info.imap_flag || args_info.smtp_flag
|| res == GSASL_NEEDS_MORE);
if (res != GSASL_OK)
error (EXIT_FAILURE, 0, _("mechanism error: %s"),
gsasl_strerror (res));
if (!args_info.quiet_given)
{
if (args_info.server_flag)
fprintf (stderr, _("Server authentication "
"finished (client trusted)...\n"));
else
fprintf (stderr, _("Client authentication "
"finished (server trusted)...\n"));
fflush (stderr);
}
/* Transfer application payload */
if (args_info.application_data_flag)
{
struct pollfd pfd[2];
char *sockbuf = NULL;
/* we read chunks of 1000 bytes at a time */
size_t sockpos = 0, sockalloc = 0, sockalloc1 = 1000;
/* Setup pollfd structs... */
pfd[0].fd = STDIN_FILENO;
pfd[0].events = POLLIN;
if (sockfd)
{
pfd[1].fd = sockfd;
pfd[1].events = POLLIN;
}
if (!args_info.quiet_given)
{
fprintf (stderr,
_("Enter application data (EOF to finish):\n"));
fflush (stderr);
}
while (1)
{
int rc;
pfd[0].revents = 0;
pfd[1].revents = 0;
rc = poll (pfd, sockfd ? 2 : 1, -1);
if (rc < 0 && errno == EINTR)
continue;
/* Always check for errors */
if (rc < 0)
error (EXIT_FAILURE, errno, "poll");
/* We got data to read from stdin.. */
if ((pfd[0].revents & (POLLIN | POLLERR)) == POLLIN)
{
char *line = NULL;
size_t n;
ssize_t len;
len = getline (&line, &n, stdin);
if (len <= 0)
break;
if (args_info.imap_flag || args_info.smtp_flag)
{
if (len < 2 || strcmp (&line[len - 2], "\r\n") != 0)
{
line = xrealloc (line, len + 2);
line[len - 1] = '\r';
line[len] = '\n';
line[len + 1] = '\0';
len++;
}
}
else
{
len--;
line[len] = '\0';
}
res = gsasl_encode (xctx, line, len, &out, &output_len);
if (res != GSASL_OK)
break;
if (sockfd)
{
#ifdef HAVE_LIBGNUTLS
if (using_tls)
len = gnutls_record_send (session, out, output_len);
else
#endif
len = write (sockfd, out, output_len);
if (len != output_len)
error (EXIT_FAILURE, errno, "write");
}
else if (!(strlen (line) == output_len &&
memcmp (line, out, output_len) == 0))
{
res = gsasl_base64_to (out, output_len,
&b64output, &b64output_len);
if (res != GSASL_OK)
break;
if (!args_info.quiet_given)
fprintf (stderr, _("Base64 encoded application "
"data to send:\n"));
fprintf (stdout, "%s\n", b64output);
free (b64output);
}
free (line);
free (out);
}
/* If there was an error, quit. */
else if (pfd[0].revents & (POLLERR | POLLHUP))
{
error (0, 0, "poll stdin");
break;
}
/* We got data to read from the socket.. */
if (sockfd && (pfd[1].revents & (POLLIN | POLLERR)) == POLLIN)
{
ssize_t len;
if (sockalloc == sockpos)
sockbuf = x2realloc (sockbuf, &sockalloc1);
sockalloc = sockalloc1;
#ifdef HAVE_LIBGNUTLS
if (using_tls)
len = gnutls_record_recv (session, &sockbuf[sockpos],
sockalloc - sockpos);
else
#endif
len = recv (sockfd, &sockbuf[sockpos],
sockalloc - sockpos, 0);
if (len <= 0)
break;
sockpos += len;
res = gsasl_decode (xctx, sockbuf, sockpos,
&out, &output_len);
if (res == GSASL_NEEDS_MORE)
{
#define MAX_INPUT_SIZE 0x100000
if (sockpos > MAX_INPUT_SIZE)
error (EXIT_FAILURE, 0,
_("SASL record too large: %zu\n"), sockpos);
continue;
}
if (res != GSASL_OK)
break;
free (sockbuf);
sockbuf = NULL;
sockpos = 0;
sockalloc = 0;
sockalloc1 = 1000;
printf ("%.*s", (int) output_len, out);
free (out);
}
/* If there was an error, quit. */
else if (pfd[1].revents & (POLLERR | POLLHUP))
{
error (0, 0, "poll socket");
break;
}
}
if (res != GSASL_OK)
error (EXIT_FAILURE, 0, _("encoding error: %s"),
gsasl_strerror (res));
}
if (!args_info.quiet_given)
fprintf (stderr, _("Session finished...\n"));
if (!logout ())
return 1;
gsasl_finish (xctx);
}
if (sockfd)
{
#ifdef HAVE_LIBGNUTLS
if (using_tls)
{
res = gnutls_bye (session, GNUTLS_SHUT_RDWR);
if (res < 0)
error (EXIT_FAILURE, 0,
_("terminating GnuTLS session failed: %s"),
gnutls_strerror (res));
}
#endif
shutdown (sockfd, SHUT_RDWR);
close (sockfd);
}
gsasl_done (ctx);
#ifdef HAVE_LIBGNUTLS
if (using_tls)
{
gnutls_deinit (session);
gnutls_anon_free_client_credentials (anoncred);
gnutls_certificate_free_credentials (x509cred);
gnutls_global_deinit ();
}
#endif
return 0;
}