static CURLcode
gtls_connect_step1(struct connectdata *conn,
int sockindex)
{
#ifndef USE_GNUTLS_PRIORITY_SET_DIRECT
static const int cert_type_priority[] = { GNUTLS_CRT_X509, 0 };
#endif
struct SessionHandle *data = conn->data;
gnutls_session session;
int rc;
void *ssl_sessionid;
size_t ssl_idsize;
bool sni = TRUE; /* default is SNI enabled */
#ifdef ENABLE_IPV6
struct in6_addr addr;
#else
struct in_addr addr;
#endif
if(conn->ssl[sockindex].state == ssl_connection_complete)
/* to make us tolerant against being called more than once for the
same connection */
return CURLE_OK;
if(!gtls_inited)
Curl_gtls_init();
/* GnuTLS only supports SSLv3 and TLSv1 */
if(data->set.ssl.version == CURL_SSLVERSION_SSLv2) {
failf(data, "GnuTLS does not support SSLv2");
return CURLE_SSL_CONNECT_ERROR;
}
else if(data->set.ssl.version == CURL_SSLVERSION_SSLv3)
sni = FALSE; /* SSLv3 has no SNI */
/* allocate a cred struct */
rc = gnutls_certificate_allocate_credentials(&conn->ssl[sockindex].cred);
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "gnutls_cert_all_cred() failed: %s", gnutls_strerror(rc));
return CURLE_SSL_CONNECT_ERROR;
}
#ifdef USE_TLS_SRP
if(data->set.ssl.authtype == CURL_TLSAUTH_SRP) {
infof(data, "Using TLS-SRP username: %s\n", data->set.ssl.username);
rc = gnutls_srp_allocate_client_credentials(
&conn->ssl[sockindex].srp_client_cred);
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "gnutls_srp_allocate_client_cred() failed: %s",
gnutls_strerror(rc));
return CURLE_OUT_OF_MEMORY;
}
rc = gnutls_srp_set_client_credentials(conn->ssl[sockindex].
srp_client_cred,
data->set.ssl.username,
data->set.ssl.password);
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "gnutls_srp_set_client_cred() failed: %s",
gnutls_strerror(rc));
return CURLE_BAD_FUNCTION_ARGUMENT;
}
}
#endif
if(data->set.ssl.CAfile) {
/* set the trusted CA cert bundle file */
gnutls_certificate_set_verify_flags(conn->ssl[sockindex].cred,
GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT);
rc = gnutls_certificate_set_x509_trust_file(conn->ssl[sockindex].cred,
data->set.ssl.CAfile,
GNUTLS_X509_FMT_PEM);
if(rc < 0) {
infof(data, "error reading ca cert file %s (%s)\n",
data->set.ssl.CAfile, gnutls_strerror(rc));
if(data->set.ssl.verifypeer)
return CURLE_SSL_CACERT_BADFILE;
}
else
infof(data, "found %d certificates in %s\n",
rc, data->set.ssl.CAfile);
}
if(data->set.ssl.CRLfile) {
/* set the CRL list file */
rc = gnutls_certificate_set_x509_crl_file(conn->ssl[sockindex].cred,
data->set.ssl.CRLfile,
GNUTLS_X509_FMT_PEM);
if(rc < 0) {
failf(data, "error reading crl file %s (%s)",
data->set.ssl.CRLfile, gnutls_strerror(rc));
return CURLE_SSL_CRL_BADFILE;
}
else
infof(data, "found %d CRL in %s\n",
rc, data->set.ssl.CRLfile);
}
/* Initialize TLS session as a client */
rc = gnutls_init(&conn->ssl[sockindex].session, GNUTLS_CLIENT);
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "gnutls_init() failed: %d", rc);
return CURLE_SSL_CONNECT_ERROR;
}
/* convenient assign */
session = conn->ssl[sockindex].session;
if((0 == Curl_inet_pton(AF_INET, conn->host.name, &addr)) &&
#ifdef ENABLE_IPV6
(0 == Curl_inet_pton(AF_INET6, conn->host.name, &addr)) &&
#endif
sni &&
(gnutls_server_name_set(session, GNUTLS_NAME_DNS, conn->host.name,
strlen(conn->host.name)) < 0))
infof(data, "WARNING: failed to configure server name indication (SNI) "
"TLS extension\n");
/* Use default priorities */
rc = gnutls_set_default_priority(session);
if(rc != GNUTLS_E_SUCCESS)
return CURLE_SSL_CONNECT_ERROR;
if(data->set.ssl.version == CURL_SSLVERSION_SSLv3) {
#ifndef USE_GNUTLS_PRIORITY_SET_DIRECT
static const int protocol_priority[] = { GNUTLS_SSL3, 0 };
rc = gnutls_protocol_set_priority(session, protocol_priority);
#else
const char *err;
/* the combination of the cipher ARCFOUR with SSL 3.0 and TLS 1.0 is not
vulnerable to attacks such as the BEAST, why this code now explicitly
asks for that
*/
rc = gnutls_priority_set_direct(session,
"NORMAL:-VERS-TLS-ALL:+VERS-SSL3.0:"
"-CIPHER-ALL:+ARCFOUR-128",
&err);
#endif
if(rc != GNUTLS_E_SUCCESS)
return CURLE_SSL_CONNECT_ERROR;
}
#ifndef USE_GNUTLS_PRIORITY_SET_DIRECT
/* Sets the priority on the certificate types supported by gnutls. Priority
is higher for types specified before others. After specifying the types
you want, you must append a 0. */
rc = gnutls_certificate_type_set_priority(session, cert_type_priority);
if(rc != GNUTLS_E_SUCCESS)
return CURLE_SSL_CONNECT_ERROR;
#endif
if(data->set.str[STRING_CERT]) {
if(gnutls_certificate_set_x509_key_file(
conn->ssl[sockindex].cred,
data->set.str[STRING_CERT],
data->set.str[STRING_KEY] ?
data->set.str[STRING_KEY] : data->set.str[STRING_CERT],
do_file_type(data->set.str[STRING_CERT_TYPE]) ) !=
GNUTLS_E_SUCCESS) {
failf(data, "error reading X.509 key or certificate file");
return CURLE_SSL_CONNECT_ERROR;
}
}
#ifdef USE_TLS_SRP
/* put the credentials to the current session */
if(data->set.ssl.authtype == CURL_TLSAUTH_SRP) {
rc = gnutls_credentials_set(session, GNUTLS_CRD_SRP,
conn->ssl[sockindex].srp_client_cred);
if(rc != GNUTLS_E_SUCCESS)
failf(data, "gnutls_credentials_set() failed: %s", gnutls_strerror(rc));
}
else
#endif
rc = gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,
conn->ssl[sockindex].cred);
/* set the connection handle (file descriptor for the socket) */
gnutls_transport_set_ptr(session,
GNUTLS_INT_TO_POINTER_CAST(conn->sock[sockindex]));
/* register callback functions to send and receive data. */
gnutls_transport_set_push_function(session, Curl_gtls_push);
gnutls_transport_set_pull_function(session, Curl_gtls_pull);
/* lowat must be set to zero when using custom push and pull functions. */
gnutls_transport_set_lowat(session, 0);
/* This might be a reconnect, so we check for a session ID in the cache
to speed up things */
if(!Curl_ssl_getsessionid(conn, &ssl_sessionid, &ssl_idsize)) {
/* we got a session id, use it! */
gnutls_session_set_data(session, ssl_sessionid, ssl_idsize);
/* Informational message */
infof (data, "SSL re-using session ID\n");
}
return CURLE_OK;
}
static CURLcode
gtls_connect_step1(struct connectdata *conn,
int sockindex)
{
struct SessionHandle *data = conn->data;
gnutls_session_t session;
int rc;
void *ssl_sessionid;
size_t ssl_idsize;
bool sni = TRUE; /* default is SNI enabled */
#ifdef ENABLE_IPV6
struct in6_addr addr;
#else
struct in_addr addr;
#endif
#ifndef USE_GNUTLS_PRIORITY_SET_DIRECT
static const int cipher_priority[] = {
/* These two ciphers were added to GnuTLS as late as ver. 3.0.1,
but this code path is only ever used for ver. < 2.12.0.
GNUTLS_CIPHER_AES_128_GCM,
GNUTLS_CIPHER_AES_256_GCM,
*/
GNUTLS_CIPHER_AES_128_CBC,
GNUTLS_CIPHER_AES_256_CBC,
GNUTLS_CIPHER_CAMELLIA_128_CBC,
GNUTLS_CIPHER_CAMELLIA_256_CBC,
GNUTLS_CIPHER_3DES_CBC,
};
static const int cert_type_priority[] = { GNUTLS_CRT_X509, 0 };
static int protocol_priority[] = { 0, 0, 0, 0 };
#else
#define GNUTLS_CIPHERS "NORMAL:-ARCFOUR-128:-CTYPE-ALL:+CTYPE-X509"
/* If GnuTLS was compiled without support for SRP it will error out if SRP is
requested in the priority string, so treat it specially
*/
#define GNUTLS_SRP "+SRP"
const char* prioritylist;
const char *err = NULL;
#endif
if(conn->ssl[sockindex].state == ssl_connection_complete)
/* to make us tolerant against being called more than once for the
same connection */
return CURLE_OK;
if(!gtls_inited)
Curl_gtls_init();
/* GnuTLS only supports SSLv3 and TLSv1 */
if(data->set.ssl.version == CURL_SSLVERSION_SSLv2) {
failf(data, "GnuTLS does not support SSLv2");
return CURLE_SSL_CONNECT_ERROR;
}
else if(data->set.ssl.version == CURL_SSLVERSION_SSLv3)
sni = FALSE; /* SSLv3 has no SNI */
/* allocate a cred struct */
rc = gnutls_certificate_allocate_credentials(&conn->ssl[sockindex].cred);
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "gnutls_cert_all_cred() failed: %s", gnutls_strerror(rc));
return CURLE_SSL_CONNECT_ERROR;
}
#ifdef USE_TLS_SRP
if(data->set.ssl.authtype == CURL_TLSAUTH_SRP) {
infof(data, "Using TLS-SRP username: %s\n", data->set.ssl.username);
rc = gnutls_srp_allocate_client_credentials(
&conn->ssl[sockindex].srp_client_cred);
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "gnutls_srp_allocate_client_cred() failed: %s",
gnutls_strerror(rc));
return CURLE_OUT_OF_MEMORY;
}
rc = gnutls_srp_set_client_credentials(conn->ssl[sockindex].
srp_client_cred,
data->set.ssl.username,
data->set.ssl.password);
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "gnutls_srp_set_client_cred() failed: %s",
gnutls_strerror(rc));
return CURLE_BAD_FUNCTION_ARGUMENT;
}
}
#endif
if(data->set.ssl.CAfile) {
/* set the trusted CA cert bundle file */
gnutls_certificate_set_verify_flags(conn->ssl[sockindex].cred,
GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT);
rc = gnutls_certificate_set_x509_trust_file(conn->ssl[sockindex].cred,
data->set.ssl.CAfile,
GNUTLS_X509_FMT_PEM);
if(rc < 0) {
infof(data, "error reading ca cert file %s (%s)\n",
data->set.ssl.CAfile, gnutls_strerror(rc));
if(data->set.ssl.verifypeer)
return CURLE_SSL_CACERT_BADFILE;
}
else
infof(data, "found %d certificates in %s\n",
rc, data->set.ssl.CAfile);
}
#ifdef HAS_CAPATH
if(data->set.ssl.CApath) {
/* set the trusted CA cert directory */
rc = gnutls_certificate_set_x509_trust_dir(conn->ssl[sockindex].cred,
data->set.ssl.CApath,
GNUTLS_X509_FMT_PEM);
if(rc < 0) {
infof(data, "error reading ca cert file %s (%s)\n",
data->set.ssl.CAfile, gnutls_strerror(rc));
if(data->set.ssl.verifypeer)
return CURLE_SSL_CACERT_BADFILE;
}
else
infof(data, "found %d certificates in %s\n",
rc, data->set.ssl.CApath);
}
#endif
#ifdef CURL_CA_FALLBACK
/* use system ca certificate store as fallback */
if(data->set.ssl.verifypeer &&
!(data->set.ssl.CAfile || data->set.ssl.CApath)) {
gnutls_certificate_set_x509_system_trust(conn->ssl[sockindex].cred);
}
#endif
if(data->set.ssl.CRLfile) {
/* set the CRL list file */
rc = gnutls_certificate_set_x509_crl_file(conn->ssl[sockindex].cred,
data->set.ssl.CRLfile,
GNUTLS_X509_FMT_PEM);
if(rc < 0) {
failf(data, "error reading crl file %s (%s)",
data->set.ssl.CRLfile, gnutls_strerror(rc));
return CURLE_SSL_CRL_BADFILE;
}
else
infof(data, "found %d CRL in %s\n",
rc, data->set.ssl.CRLfile);
}
/* Initialize TLS session as a client */
rc = gnutls_init(&conn->ssl[sockindex].session, GNUTLS_CLIENT);
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "gnutls_init() failed: %d", rc);
return CURLE_SSL_CONNECT_ERROR;
}
/* convenient assign */
session = conn->ssl[sockindex].session;
if((0 == Curl_inet_pton(AF_INET, conn->host.name, &addr)) &&
#ifdef ENABLE_IPV6
(0 == Curl_inet_pton(AF_INET6, conn->host.name, &addr)) &&
#endif
sni &&
(gnutls_server_name_set(session, GNUTLS_NAME_DNS, conn->host.name,
strlen(conn->host.name)) < 0))
infof(data, "WARNING: failed to configure server name indication (SNI) "
"TLS extension\n");
/* Use default priorities */
rc = gnutls_set_default_priority(session);
if(rc != GNUTLS_E_SUCCESS)
return CURLE_SSL_CONNECT_ERROR;
#ifndef USE_GNUTLS_PRIORITY_SET_DIRECT
rc = gnutls_cipher_set_priority(session, cipher_priority);
if(rc != GNUTLS_E_SUCCESS)
return CURLE_SSL_CONNECT_ERROR;
/* Sets the priority on the certificate types supported by gnutls. Priority
is higher for types specified before others. After specifying the types
you want, you must append a 0. */
rc = gnutls_certificate_type_set_priority(session, cert_type_priority);
if(rc != GNUTLS_E_SUCCESS)
return CURLE_SSL_CONNECT_ERROR;
if(data->set.ssl.cipher_list != NULL) {
failf(data, "can't pass a custom cipher list to older GnuTLS"
" versions");
return CURLE_SSL_CONNECT_ERROR;
}
switch (data->set.ssl.version) {
case CURL_SSLVERSION_SSLv3:
protocol_priority[0] = GNUTLS_SSL3;
break;
case CURL_SSLVERSION_DEFAULT:
case CURL_SSLVERSION_TLSv1:
protocol_priority[0] = GNUTLS_TLS1_0;
protocol_priority[1] = GNUTLS_TLS1_1;
protocol_priority[2] = GNUTLS_TLS1_2;
break;
case CURL_SSLVERSION_TLSv1_0:
protocol_priority[0] = GNUTLS_TLS1_0;
break;
case CURL_SSLVERSION_TLSv1_1:
protocol_priority[0] = GNUTLS_TLS1_1;
break;
case CURL_SSLVERSION_TLSv1_2:
protocol_priority[0] = GNUTLS_TLS1_2;
break;
case CURL_SSLVERSION_SSLv2:
default:
failf(data, "GnuTLS does not support SSLv2");
return CURLE_SSL_CONNECT_ERROR;
break;
}
rc = gnutls_protocol_set_priority(session, protocol_priority);
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "Did you pass a valid GnuTLS cipher list?");
return CURLE_SSL_CONNECT_ERROR;
}
#else
/* Ensure +SRP comes at the *end* of all relevant strings so that it can be
* removed if a run-time error indicates that SRP is not supported by this
* GnuTLS version */
switch (data->set.ssl.version) {
case CURL_SSLVERSION_SSLv3:
prioritylist = GNUTLS_CIPHERS ":-VERS-TLS-ALL:+VERS-SSL3.0";
sni = false;
break;
case CURL_SSLVERSION_DEFAULT:
case CURL_SSLVERSION_TLSv1:
prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:" GNUTLS_SRP;
break;
case CURL_SSLVERSION_TLSv1_0:
prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
"+VERS-TLS1.0:" GNUTLS_SRP;
break;
case CURL_SSLVERSION_TLSv1_1:
prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
"+VERS-TLS1.1:" GNUTLS_SRP;
break;
case CURL_SSLVERSION_TLSv1_2:
prioritylist = GNUTLS_CIPHERS ":-VERS-SSL3.0:-VERS-TLS-ALL:"
"+VERS-TLS1.2:" GNUTLS_SRP;
break;
case CURL_SSLVERSION_SSLv2:
default:
failf(data, "GnuTLS does not support SSLv2");
return CURLE_SSL_CONNECT_ERROR;
break;
}
rc = gnutls_priority_set_direct(session, prioritylist, &err);
if((rc == GNUTLS_E_INVALID_REQUEST) && err) {
if(!strcmp(err, GNUTLS_SRP)) {
/* This GnuTLS was probably compiled without support for SRP.
* Note that fact and try again without it. */
int validprioritylen = curlx_uztosi(err - prioritylist);
char *prioritycopy = strdup(prioritylist);
if(!prioritycopy)
return CURLE_OUT_OF_MEMORY;
infof(data, "This GnuTLS does not support SRP\n");
if(validprioritylen)
/* Remove the :+SRP */
prioritycopy[validprioritylen - 1] = 0;
rc = gnutls_priority_set_direct(session, prioritycopy, &err);
free(prioritycopy);
}
}
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "Error %d setting GnuTLS cipher list starting with %s",
rc, err);
return CURLE_SSL_CONNECT_ERROR;
}
#endif
#ifdef HAS_ALPN
if(data->set.ssl_enable_alpn) {
int cur = 0;
gnutls_datum_t protocols[2];
#ifdef USE_NGHTTP2
if(data->set.httpversion >= CURL_HTTP_VERSION_2) {
protocols[cur].data = (unsigned char *)NGHTTP2_PROTO_VERSION_ID;
protocols[cur].size = NGHTTP2_PROTO_VERSION_ID_LEN;
cur++;
infof(data, "ALPN, offering %s\n", NGHTTP2_PROTO_VERSION_ID);
}
#endif
protocols[cur].data = (unsigned char *)ALPN_HTTP_1_1;
protocols[cur].size = ALPN_HTTP_1_1_LENGTH;
cur++;
infof(data, "ALPN, offering %s\n", ALPN_HTTP_1_1);
gnutls_alpn_set_protocols(session, protocols, cur, 0);
}
#endif
if(data->set.str[STRING_CERT]) {
if(data->set.str[STRING_KEY_PASSWD]) {
#if HAVE_GNUTLS_CERTIFICATE_SET_X509_KEY_FILE2
const unsigned int supported_key_encryption_algorithms =
GNUTLS_PKCS_USE_PKCS12_3DES | GNUTLS_PKCS_USE_PKCS12_ARCFOUR |
GNUTLS_PKCS_USE_PKCS12_RC2_40 | GNUTLS_PKCS_USE_PBES2_3DES |
GNUTLS_PKCS_USE_PBES2_AES_128 | GNUTLS_PKCS_USE_PBES2_AES_192 |
GNUTLS_PKCS_USE_PBES2_AES_256;
rc = gnutls_certificate_set_x509_key_file2(
conn->ssl[sockindex].cred,
data->set.str[STRING_CERT],
data->set.str[STRING_KEY] ?
data->set.str[STRING_KEY] : data->set.str[STRING_CERT],
do_file_type(data->set.str[STRING_CERT_TYPE]),
data->set.str[STRING_KEY_PASSWD],
supported_key_encryption_algorithms);
if(rc != GNUTLS_E_SUCCESS) {
failf(data,
"error reading X.509 potentially-encrypted key file: %s",
gnutls_strerror(rc));
return CURLE_SSL_CONNECT_ERROR;
}
#else
failf(data, "gnutls lacks support for encrypted key files");
return CURLE_SSL_CONNECT_ERROR;
#endif
}
else {
rc = gnutls_certificate_set_x509_key_file(
conn->ssl[sockindex].cred,
data->set.str[STRING_CERT],
data->set.str[STRING_KEY] ?
data->set.str[STRING_KEY] : data->set.str[STRING_CERT],
do_file_type(data->set.str[STRING_CERT_TYPE]) );
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "error reading X.509 key or certificate file: %s",
gnutls_strerror(rc));
return CURLE_SSL_CONNECT_ERROR;
}
}
}
#ifdef USE_TLS_SRP
/* put the credentials to the current session */
if(data->set.ssl.authtype == CURL_TLSAUTH_SRP) {
rc = gnutls_credentials_set(session, GNUTLS_CRD_SRP,
conn->ssl[sockindex].srp_client_cred);
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "gnutls_credentials_set() failed: %s", gnutls_strerror(rc));
return CURLE_SSL_CONNECT_ERROR;
}
}
else
#endif
{
rc = gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,
conn->ssl[sockindex].cred);
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "gnutls_credentials_set() failed: %s", gnutls_strerror(rc));
return CURLE_SSL_CONNECT_ERROR;
}
}
/* set the connection handle (file descriptor for the socket) */
gnutls_transport_set_ptr(session,
GNUTLS_INT_TO_POINTER_CAST(conn->sock[sockindex]));
/* register callback functions to send and receive data. */
gnutls_transport_set_push_function(session, Curl_gtls_push);
gnutls_transport_set_pull_function(session, Curl_gtls_pull);
/* lowat must be set to zero when using custom push and pull functions. */
gnutls_transport_set_lowat(session, 0);
#ifdef HAS_OCSP
if(data->set.ssl.verifystatus) {
rc = gnutls_ocsp_status_request_enable_client(session, NULL, 0, NULL);
if(rc != GNUTLS_E_SUCCESS) {
failf(data, "gnutls_ocsp_status_request_enable_client() failed: %d", rc);
return CURLE_SSL_CONNECT_ERROR;
}
}
#endif
/* This might be a reconnect, so we check for a session ID in the cache
to speed up things */
if(!Curl_ssl_getsessionid(conn, &ssl_sessionid, &ssl_idsize)) {
/* we got a session id, use it! */
gnutls_session_set_data(session, ssl_sessionid, ssl_idsize);
/* Informational message */
infof (data, "SSL re-using session ID\n");
}
return CURLE_OK;
}
/**
* gnutls_init - initialize the session to null (null encryption etc...).
* @con_end: indicate if this session is to be used for server or client.
* @session: is a pointer to a #gnutls_session_t structure.
*
* This function initializes the current session to null. Every
* session must be initialized before use, so internal structures can
* be allocated. This function allocates structures which can only
* be free'd by calling gnutls_deinit(). Returns zero on success.
*
* @con_end can be one of %GNUTLS_CLIENT and %GNUTLS_SERVER.
*
* Returns: %GNUTLS_E_SUCCESS on success, or an error code.
**/
int
gnutls_init (gnutls_session_t * session, gnutls_connection_end_t con_end)
{
*session = gnutls_calloc (1, sizeof (struct gnutls_session_int));
if (*session == NULL)
return GNUTLS_E_MEMORY_ERROR;
(*session)->security_parameters.entity = con_end;
/* the default certificate type for TLS */
(*session)->security_parameters.cert_type = DEFAULT_CERT_TYPE;
/* Set the defaults for initial handshake */
(*session)->security_parameters.read_bulk_cipher_algorithm =
(*session)->security_parameters.write_bulk_cipher_algorithm =
GNUTLS_CIPHER_NULL;
(*session)->security_parameters.read_mac_algorithm =
(*session)->security_parameters.write_mac_algorithm = GNUTLS_MAC_NULL;
(*session)->security_parameters.read_compression_algorithm =
GNUTLS_COMP_NULL;
(*session)->security_parameters.write_compression_algorithm =
GNUTLS_COMP_NULL;
(*session)->internals.enable_private = 0;
/* Initialize buffers */
_gnutls_buffer_init (&(*session)->internals.application_data_buffer);
_gnutls_buffer_init (&(*session)->internals.handshake_data_buffer);
_gnutls_buffer_init (&(*session)->internals.handshake_hash_buffer);
_gnutls_buffer_init (&(*session)->internals.ia_data_buffer);
_gnutls_buffer_init (&(*session)->internals.record_send_buffer);
_gnutls_buffer_init (&(*session)->internals.record_recv_buffer);
_gnutls_buffer_init (&(*session)->internals.handshake_send_buffer);
_gnutls_buffer_init (&(*session)->internals.handshake_recv_buffer);
(*session)->key = gnutls_calloc (1, sizeof (struct gnutls_key_st));
if ((*session)->key == NULL)
{
cleanup_session:
gnutls_free (*session);
*session = NULL;
return GNUTLS_E_MEMORY_ERROR;
}
(*session)->internals.expire_time = DEFAULT_EXPIRE_TIME; /* one hour default */
gnutls_dh_set_prime_bits ((*session), MIN_DH_BITS);
gnutls_transport_set_lowat ((*session), DEFAULT_LOWAT); /* the default for tcp */
gnutls_handshake_set_max_packet_length ((*session),
MAX_HANDSHAKE_PACKET_SIZE);
/* Allocate a minimum size for recv_data
* This is allocated in order to avoid small messages, making
* the receive procedure slow.
*/
if (_gnutls_buffer_resize (&(*session)->internals.record_recv_buffer,
INITIAL_RECV_BUFFER_SIZE))
{
gnutls_free ((*session)->key);
goto cleanup_session;
}
/* set the socket pointers to -1;
*/
(*session)->internals.transport_recv_ptr = (gnutls_transport_ptr_t) - 1;
(*session)->internals.transport_send_ptr = (gnutls_transport_ptr_t) - 1;
/* set the default maximum record size for TLS
*/
(*session)->security_parameters.max_record_recv_size =
DEFAULT_MAX_RECORD_SIZE;
(*session)->security_parameters.max_record_send_size =
DEFAULT_MAX_RECORD_SIZE;
/* everything else not initialized here is initialized
* as NULL or 0. This is why calloc is used.
*/
_gnutls_handshake_internal_state_clear (*session);
return 0;
}
bool CTlsSocket::Init()
{
// This function initializes GnuTLS
m_initialized = true;
int res = gnutls_global_init();
if (res)
{
LogError(res);
Uninit();
return false;
}
#if TLSDEBUG
pLoggingControlSocket = m_pOwner;
gnutls_global_set_log_function(log_func);
gnutls_global_set_log_level(99);
#endif
res = gnutls_certificate_allocate_credentials(&m_certCredentials);
if (res < 0)
{
LogError(res);
Uninit();
return false;
}
res = gnutls_init(&m_session, GNUTLS_CLIENT);
if (res)
{
LogError(res);
Uninit();
return false;
}
res = gnutls_set_default_priority(m_session);
if (res)
{
LogError(res);
Uninit();
return false;
}
gnutls_dh_set_prime_bits(m_session, 512);
// Set which type of certificates we accept
const int cert_type_priority[] = { GNUTLS_CRT_X509, 0 };
gnutls_certificate_type_set_priority(m_session, cert_type_priority);
if (res)
{
LogError(res);
Uninit();
return false;
}
gnutls_credentials_set(m_session, GNUTLS_CRD_CERTIFICATE, m_certCredentials);
// Setup transport functions
gnutls_transport_set_push_function(m_session, PushFunction);
gnutls_transport_set_pull_function(m_session, PullFunction);
gnutls_transport_set_ptr(m_session, (gnutls_transport_ptr_t)this);
gnutls_transport_set_lowat(m_session, 0);
m_shutdown_requested = false;
// At this point, we can start shaking hands.
return true;
}
/**
* Initiates a new TLS session.
*
* @return 0 on success, -1 on error.
*/
int
tls_init(struct gnutella_socket *s)
{
/**
* ANON-DH is enabled because we don't use PKI.
* DEFLATE is disabled because it seems to cause crashes.
* ARCFOUR-40 is disabled because it is deprecated.
*/
static const char prio_want[] = "NORMAL:+ANON-DH:-ARCFOUR-40:-COMP-DEFLATE";
/* "-COMP-DEFLATE" is causing an error on MinGW with GnuTLS 2.10.2 */
static const char prio_must[] = "NORMAL:+ANON-DH:-ARCFOUR-40";
const bool server = SOCK_CONN_INCOMING == s->direction;
struct tls_context *ctx;
const char *fn;
int e;
#define TRY(function) (fn = (#function)), e = function
socket_check(s);
WALLOC0(ctx);
ctx->s = s;
s->tls.ctx = ctx;
if (
TRY(gnutls_init)(&ctx->session, server ? GNUTLS_SERVER : GNUTLS_CLIENT)
) {
ctx->session = NULL;
goto failure;
}
if (TRY(gnutls_priority_set_direct)(ctx->session, prio_want, NULL)) {
const char *error;
if (TRY(gnutls_priority_set_direct)(ctx->session, prio_must, &error)) {
g_warning("%s() failed at \"%s\"", fn, error);
goto failure;
}
}
if (TRY(gnutls_credentials_set)(ctx->session,
GNUTLS_CRD_CERTIFICATE, cert_cred))
goto failure;
gnutls_dh_set_prime_bits(ctx->session, TLS_DH_BITS);
#ifdef USE_TLS_CUSTOM_IO
gnutls_transport_set_ptr(ctx->session, s);
gnutls_transport_set_push_function(ctx->session, tls_push);
gnutls_transport_set_pull_function(ctx->session, tls_pull);
#if !HAS_TLS(2, 12)
/*
* This routine has been removed starting TLS 3.0. It was used to disable
* the lowat feature, and apparently this is now always the case in recent
* TLS versions. --RAM, 2011-09-28
*
* It's also flagged as deprecated in 2.12.x, so don't use it there.
* --RAM, 2011-12-15
*/
gnutls_transport_set_lowat(ctx->session, 0);
#endif
#else /* !USE_TLS_CUSTOM_IO */
g_assert(is_valid_fd(s->file_desc));
gnutls_transport_set_ptr(ctx->session, int_to_pointer(s->file_desc));
#endif /* USE_TLS_CUSTOM_IO */
if (server) {
if (TRY(gnutls_anon_allocate_server_credentials)(&ctx->server_cred))
goto failure;
gnutls_anon_set_server_dh_params(ctx->server_cred, get_dh_params());
if (TRY(gnutls_credentials_set)(ctx->session,
GNUTLS_CRD_ANON, ctx->server_cred))
goto failure;
} else {
if (TRY(gnutls_anon_allocate_client_credentials)(&ctx->client_cred))
goto failure;
if (TRY(gnutls_credentials_set)(ctx->session,
GNUTLS_CRD_ANON, ctx->client_cred))
goto failure;
}
return 0;
failure:
g_warning("%s() failed: %s", EMPTY_STRING(fn), gnutls_strerror(e));
tls_free(s);
return -1;
#undef TRY
}
/*
* This function is called after the TCP connect has completed. Setup the TLS
* layer and do all necessary magic.
*/
CURLcode
Curl_gtls_connect(struct connectdata *conn,
int sockindex)
{
static const int cert_type_priority[] = { GNUTLS_CRT_X509, 0 };
struct SessionHandle *data = conn->data;
gnutls_session session;
int rc;
unsigned int cert_list_size;
const gnutls_datum *chainp;
unsigned int verify_status;
gnutls_x509_crt x509_cert;
char certbuf[256]; /* big enough? */
size_t size;
unsigned int algo;
unsigned int bits;
time_t clock;
const char *ptr;
void *ssl_sessionid;
size_t ssl_idsize;
if (!gtls_inited) _Curl_gtls_init();
/* GnuTLS only supports TLSv1 (and SSLv3?) */
if(data->set.ssl.version == CURL_SSLVERSION_SSLv2) {
failf(data, "GnuTLS does not support SSLv2");
return CURLE_SSL_CONNECT_ERROR;
}
/* allocate a cred struct */
rc = gnutls_certificate_allocate_credentials(&conn->ssl[sockindex].cred);
if(rc < 0) {
failf(data, "gnutls_cert_all_cred() failed: %s", gnutls_strerror(rc));
return CURLE_SSL_CONNECT_ERROR;
}
if(data->set.ssl.CAfile) {
/* set the trusted CA cert bundle file */
gnutls_certificate_set_verify_flags(conn->ssl[sockindex].cred,
GNUTLS_VERIFY_ALLOW_X509_V1_CA_CRT);
rc = gnutls_certificate_set_x509_trust_file(conn->ssl[sockindex].cred,
data->set.ssl.CAfile,
GNUTLS_X509_FMT_PEM);
if(rc < 0) {
infof(data, "error reading ca cert file %s (%s)\n",
data->set.ssl.CAfile, gnutls_strerror(rc));
if (data->set.ssl.verifypeer)
return CURLE_SSL_CACERT_BADFILE;
}
else
infof(data, "found %d certificates in %s\n",
rc, data->set.ssl.CAfile);
}
/* Initialize TLS session as a client */
rc = gnutls_init(&conn->ssl[sockindex].session, GNUTLS_CLIENT);
if(rc) {
failf(data, "gnutls_init() failed: %d", rc);
return CURLE_SSL_CONNECT_ERROR;
}
/* convenient assign */
session = conn->ssl[sockindex].session;
/* Use default priorities */
rc = gnutls_set_default_priority(session);
if(rc < 0)
return CURLE_SSL_CONNECT_ERROR;
/* Sets the priority on the certificate types supported by gnutls. Priority
is higher for types specified before others. After specifying the types
you want, you must append a 0. */
rc = gnutls_certificate_type_set_priority(session, cert_type_priority);
if(rc < 0)
return CURLE_SSL_CONNECT_ERROR;
if(data->set.str[STRING_CERT]) {
if( gnutls_certificate_set_x509_key_file(
conn->ssl[sockindex].cred,
data->set.str[STRING_CERT],
data->set.str[STRING_KEY] ?
data->set.str[STRING_KEY] : data->set.str[STRING_CERT],
do_file_type(data->set.str[STRING_CERT_TYPE]) ) ) {
failf(data, "error reading X.509 key or certificate file");
return CURLE_SSL_CONNECT_ERROR;
}
}
/* put the credentials to the current session */
rc = gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE,
conn->ssl[sockindex].cred);
/* set the connection handle (file descriptor for the socket) */
gnutls_transport_set_ptr(session,
(gnutls_transport_ptr)conn->sock[sockindex]);
/* register callback functions to send and receive data. */
gnutls_transport_set_push_function(session, Curl_gtls_push);
gnutls_transport_set_pull_function(session, Curl_gtls_pull);
/* lowat must be set to zero when using custom push and pull functions. */
gnutls_transport_set_lowat(session, 0);
/* This might be a reconnect, so we check for a session ID in the cache
to speed up things */
if(!Curl_ssl_getsessionid(conn, &ssl_sessionid, &ssl_idsize)) {
/* we got a session id, use it! */
gnutls_session_set_data(session, ssl_sessionid, ssl_idsize);
/* Informational message */
infof (data, "SSL re-using session ID\n");
}
rc = handshake(conn, session, sockindex, TRUE);
if(rc)
/* handshake() sets its own error message with failf() */
return rc;
/* This function will return the peer's raw certificate (chain) as sent by
the peer. These certificates are in raw format (DER encoded for
X.509). In case of a X.509 then a certificate list may be present. The
first certificate in the list is the peer's certificate, following the
issuer's certificate, then the issuer's issuer etc. */
chainp = gnutls_certificate_get_peers(session, &cert_list_size);
if(!chainp) {
if(data->set.ssl.verifyhost) {
failf(data, "failed to get server cert");
return CURLE_PEER_FAILED_VERIFICATION;
}
infof(data, "\t common name: WARNING couldn't obtain\n");
}
/* This function will try to verify the peer's certificate and return its
status (trusted, invalid etc.). The value of status should be one or more
of the gnutls_certificate_status_t enumerated elements bitwise or'd. To
avoid denial of service attacks some default upper limits regarding the
certificate key size and chain size are set. To override them use
gnutls_certificate_set_verify_limits(). */
rc = gnutls_certificate_verify_peers2(session, &verify_status);
if (rc < 0) {
failf(data, "server cert verify failed: %d", rc);
return CURLE_SSL_CONNECT_ERROR;
}
/* verify_status is a bitmask of gnutls_certificate_status bits */
if(verify_status & GNUTLS_CERT_INVALID) {
if (data->set.ssl.verifypeer) {
failf(data, "server certificate verification failed. CAfile: %s",
data->set.ssl.CAfile?data->set.ssl.CAfile:"none");
return CURLE_SSL_CACERT;
}
else
infof(data, "\t server certificate verification FAILED\n");
}
else
infof(data, "\t server certificate verification OK\n");
/* initialize an X.509 certificate structure. */
gnutls_x509_crt_init(&x509_cert);
/* convert the given DER or PEM encoded Certificate to the native
gnutls_x509_crt_t format */
gnutls_x509_crt_import(x509_cert, chainp, GNUTLS_X509_FMT_DER);
size=sizeof(certbuf);
rc = gnutls_x509_crt_get_dn_by_oid(x509_cert, GNUTLS_OID_X520_COMMON_NAME,
0, /* the first and only one */
FALSE,
certbuf,
&size);
if(rc) {
infof(data, "error fetching CN from cert:%s\n",
gnutls_strerror(rc));
}
/* This function will check if the given certificate's subject matches the
given hostname. This is a basic implementation of the matching described
in RFC2818 (HTTPS), which takes into account wildcards, and the subject
alternative name PKIX extension. Returns non zero on success, and zero on
failure. */
rc = gnutls_x509_crt_check_hostname(x509_cert, conn->host.name);
if(!rc) {
if (data->set.ssl.verifyhost > 1) {
failf(data, "SSL: certificate subject name (%s) does not match "
"target host name '%s'", certbuf, conn->host.dispname);
gnutls_x509_crt_deinit(x509_cert);
return CURLE_PEER_FAILED_VERIFICATION;
}
else
infof(data, "\t common name: %s (does not match '%s')\n",
certbuf, conn->host.dispname);
}
else
infof(data, "\t common name: %s (matched)\n", certbuf);
/* Check for time-based validity */
clock = gnutls_x509_crt_get_expiration_time(x509_cert);
if(clock == (time_t)-1) {
failf(data, "server cert expiration date verify failed");
return CURLE_SSL_CONNECT_ERROR;
}
if(clock < time(NULL)) {
if (data->set.ssl.verifypeer) {
failf(data, "server certificate expiration date has passed.");
return CURLE_PEER_FAILED_VERIFICATION;
}
else
infof(data, "\t server certificate expiration date FAILED\n");
}
else
infof(data, "\t server certificate expiration date OK\n");
clock = gnutls_x509_crt_get_activation_time(x509_cert);
if(clock == (time_t)-1) {
failf(data, "server cert activation date verify failed");
return CURLE_SSL_CONNECT_ERROR;
}
if(clock > time(NULL)) {
if (data->set.ssl.verifypeer) {
failf(data, "server certificate not activated yet.");
return CURLE_PEER_FAILED_VERIFICATION;
}
else
infof(data, "\t server certificate activation date FAILED\n");
}
else
infof(data, "\t server certificate activation date OK\n");
/* Show:
- ciphers used
- subject
- start date
- expire date
- common name
- issuer
*/
/* public key algorithm's parameters */
algo = gnutls_x509_crt_get_pk_algorithm(x509_cert, &bits);
infof(data, "\t certificate public key: %s\n",
gnutls_pk_algorithm_get_name(algo));
/* version of the X.509 certificate. */
infof(data, "\t certificate version: #%d\n",
gnutls_x509_crt_get_version(x509_cert));
size = sizeof(certbuf);
gnutls_x509_crt_get_dn(x509_cert, certbuf, &size);
infof(data, "\t subject: %s\n", certbuf);
clock = gnutls_x509_crt_get_activation_time(x509_cert);
showtime(data, "start date", clock);
clock = gnutls_x509_crt_get_expiration_time(x509_cert);
showtime(data, "expire date", clock);
size = sizeof(certbuf);
gnutls_x509_crt_get_issuer_dn(x509_cert, certbuf, &size);
infof(data, "\t issuer: %s\n", certbuf);
gnutls_x509_crt_deinit(x509_cert);
/* compression algorithm (if any) */
ptr = gnutls_compression_get_name(gnutls_compression_get(session));
/* the *_get_name() says "NULL" if GNUTLS_COMP_NULL is returned */
infof(data, "\t compression: %s\n", ptr);
/* the name of the cipher used. ie 3DES. */
ptr = gnutls_cipher_get_name(gnutls_cipher_get(session));
infof(data, "\t cipher: %s\n", ptr);
/* the MAC algorithms name. ie SHA1 */
ptr = gnutls_mac_get_name(gnutls_mac_get(session));
infof(data, "\t MAC: %s\n", ptr);
if(!ssl_sessionid) {
/* this session was not previously in the cache, add it now */
/* get the session ID data size */
gnutls_session_get_data(session, NULL, &ssl_idsize);
ssl_sessionid = malloc(ssl_idsize); /* get a buffer for it */
if(ssl_sessionid) {
/* extract session ID to the allocated buffer */
gnutls_session_get_data(session, ssl_sessionid, &ssl_idsize);
/* store this session id */
return Curl_ssl_addsessionid(conn, ssl_sessionid, ssl_idsize);
}
}
return CURLE_OK;
}
