static ssize_t
schannel_recv(struct connectdata *conn, int sockindex,
char *buf, size_t len, CURLcode *err)
{
size_t size = 0;
ssize_t nread = 0, ret = -1;
CURLcode retcode;
struct SessionHandle *data = conn->data;
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
bool done = FALSE;
SecBuffer inbuf[4];
SecBufferDesc inbuf_desc;
SECURITY_STATUS sspi_status = SEC_E_OK;
infof(data, "schannel: client wants to read %zu bytes\n", len);
*err = CURLE_OK;
/* buffer to store previously received and decrypted data */
if(connssl->decdata_buffer == NULL) {
connssl->decdata_offset = 0;
connssl->decdata_length = CURL_SCHANNEL_BUFFER_INIT_SIZE;
connssl->decdata_buffer = malloc(connssl->decdata_length);
if(connssl->decdata_buffer == NULL) {
failf(data, "schannel: unable to allocate memory");
*err = CURLE_OUT_OF_MEMORY;
return -1;
}
}
/* increase buffer in order to fit the requested amount of data */
while(connssl->encdata_length - connssl->encdata_offset <
CURL_SCHANNEL_BUFFER_FREE_SIZE || connssl->encdata_length < len) {
/* increase internal encrypted data buffer */
connssl->encdata_length *= CURL_SCHANNEL_BUFFER_STEP_FACTOR;
connssl->encdata_buffer = realloc(connssl->encdata_buffer,
connssl->encdata_length);
if(connssl->encdata_buffer == NULL) {
failf(data, "schannel: unable to re-allocate memory");
*err = CURLE_OUT_OF_MEMORY;
return -1;
}
}
/* read encrypted data from socket */
infof(data, "schannel: encrypted data buffer: offset %zu length %zu\n",
connssl->encdata_offset, connssl->encdata_length);
size = connssl->encdata_length - connssl->encdata_offset;
if(size > 0) {
*err = Curl_read_plain(conn->sock[sockindex],
(char *) (connssl->encdata_buffer + connssl->encdata_offset),
size, &nread);
/* check for received data */
if(*err != CURLE_OK)
ret = -1;
else {
if(nread > 0)
/* increase encrypted data buffer offset */
connssl->encdata_offset += nread;
ret = nread;
}
infof(data, "schannel: encrypted data got %zd\n", ret);
}
infof(data, "schannel: encrypted data buffer: offset %zu length %zu\n",
connssl->encdata_offset, connssl->encdata_length);
/* check if we still have some data in our buffers */
while(connssl->encdata_offset > 0 && sspi_status == SEC_E_OK &&
connssl->decdata_offset < len) {
/* prepare data buffer for DecryptMessage call */
InitSecBuffer(&inbuf[0], SECBUFFER_DATA, connssl->encdata_buffer,
curlx_uztoul(connssl->encdata_offset));
/* we need 3 more empty input buffers for possible output */
InitSecBuffer(&inbuf[1], SECBUFFER_EMPTY, NULL, 0);
InitSecBuffer(&inbuf[2], SECBUFFER_EMPTY, NULL, 0);
InitSecBuffer(&inbuf[3], SECBUFFER_EMPTY, NULL, 0);
InitSecBufferDesc(&inbuf_desc, inbuf, 4);
/* http://msdn.microsoft.com/en-us/library/windows/desktop/aa375348.aspx */
sspi_status = s_pSecFn->DecryptMessage(&connssl->ctxt->ctxt_handle,
&inbuf_desc, 0, NULL);
/* check if we need more data */
if(sspi_status == SEC_E_INCOMPLETE_MESSAGE) {
infof(data, "schannel: failed to decrypt data, need more data\n");
*err = CURLE_AGAIN;
return -1;
}
/* check if everything went fine (server may want to renegotiate
context) */
if(sspi_status == SEC_E_OK || sspi_status == SEC_I_RENEGOTIATE ||
sspi_status == SEC_I_CONTEXT_EXPIRED) {
/* check for successfully decrypted data */
if(inbuf[1].BufferType == SECBUFFER_DATA) {
infof(data, "schannel: decrypted data length: %lu\n",
inbuf[1].cbBuffer);
/* increase buffer in order to fit the received amount of data */
size = inbuf[1].cbBuffer > CURL_SCHANNEL_BUFFER_FREE_SIZE ?
inbuf[1].cbBuffer : CURL_SCHANNEL_BUFFER_FREE_SIZE;
while(connssl->decdata_length - connssl->decdata_offset < size ||
connssl->decdata_length < len) {
/* increase internal decrypted data buffer */
connssl->decdata_length *= CURL_SCHANNEL_BUFFER_STEP_FACTOR;
connssl->decdata_buffer = realloc(connssl->decdata_buffer,
connssl->decdata_length);
if(connssl->decdata_buffer == NULL) {
failf(data, "schannel: unable to re-allocate memory");
*err = CURLE_OUT_OF_MEMORY;
return -1;
}
}
/* copy decrypted data to internal buffer */
size = inbuf[1].cbBuffer;
if(size > 0) {
memcpy(connssl->decdata_buffer + connssl->decdata_offset,
inbuf[1].pvBuffer, size);
connssl->decdata_offset += size;
}
infof(data, "schannel: decrypted data added: %zu\n", size);
infof(data, "schannel: decrypted data cached: offset %zu length %zu\n",
connssl->decdata_offset, connssl->decdata_length);
}
/* check for remaining encrypted data */
if(inbuf[3].BufferType == SECBUFFER_EXTRA && inbuf[3].cbBuffer > 0) {
infof(data, "schannel: encrypted data length: %lu\n",
inbuf[3].cbBuffer);
/* check if the remaining data is less than the total amount
* and therefore begins after the already processed data
*/
if(connssl->encdata_offset > inbuf[3].cbBuffer) {
/* move remaining encrypted data forward to the beginning of
buffer */
memmove(connssl->encdata_buffer,
(connssl->encdata_buffer + connssl->encdata_offset) -
inbuf[3].cbBuffer, inbuf[3].cbBuffer);
connssl->encdata_offset = inbuf[3].cbBuffer;
}
infof(data, "schannel: encrypted data cached: offset %zu length %zu\n",
connssl->encdata_offset, connssl->encdata_length);
}
else{
/* reset encrypted buffer offset, because there is no data remaining */
connssl->encdata_offset = 0;
}
}
/* check if server wants to renegotiate the connection context */
if(sspi_status == SEC_I_RENEGOTIATE) {
infof(data, "schannel: remote party requests SSL/TLS renegotiation\n");
/* begin renegotiation */
infof(data, "schannel: renegotiating SSL/TLS connection\n");
connssl->state = ssl_connection_negotiating;
connssl->connecting_state = ssl_connect_2_writing;
retcode = schannel_connect_common(conn, sockindex, FALSE, &done);
if(retcode)
*err = retcode;
else {
infof(data, "schannel: SSL/TLS connection renegotiated\n");
/* now retry receiving data */
return schannel_recv(conn, sockindex, buf, len, err);
}
}
}
infof(data, "schannel: decrypted data buffer: offset %zu length %zu\n",
connssl->decdata_offset, connssl->decdata_length);
/* copy requested decrypted data to supplied buffer */
size = len < connssl->decdata_offset ? len : connssl->decdata_offset;
if(size > 0) {
memcpy(buf, connssl->decdata_buffer, size);
ret = size;
/* move remaining decrypted data forward to the beginning of buffer */
memmove(connssl->decdata_buffer, connssl->decdata_buffer + size,
connssl->decdata_offset - size);
connssl->decdata_offset -= size;
infof(data, "schannel: decrypted data returned %zd\n", size);
infof(data, "schannel: decrypted data buffer: offset %zu length %zu\n",
connssl->decdata_offset, connssl->decdata_length);
}
/* check if the server closed the connection */
if(ret <= 0 && ( /* special check for Windows 2000 Professional */
sspi_status == SEC_I_CONTEXT_EXPIRED || (sspi_status == SEC_E_OK &&
connssl->encdata_offset > 0 && connssl->encdata_buffer[0] == 0x15))) {
infof(data, "schannel: server closed the connection\n");
*err = CURLE_OK;
return 0;
}
/* check if something went wrong and we need to return an error */
if(ret < 0 && sspi_status != SEC_E_OK) {
infof(data, "schannel: failed to read data from server: %s\n",
Curl_sspi_strerror(conn, sspi_status));
*err = CURLE_RECV_ERROR;
return -1;
}
return ret;
}
static ssize_t
schannel_send(struct connectdata *conn, int sockindex,
const void *buf, size_t len, CURLcode *err)
{
ssize_t written = -1;
size_t data_len = 0;
unsigned char *data = NULL;
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
SecBuffer outbuf[4];
SecBufferDesc outbuf_desc;
SECURITY_STATUS sspi_status = SEC_E_OK;
CURLcode code;
/* check if the maximum stream sizes were queried */
if(connssl->stream_sizes.cbMaximumMessage == 0) {
sspi_status = s_pSecFn->QueryContextAttributes(
&connssl->ctxt->ctxt_handle,
SECPKG_ATTR_STREAM_SIZES,
&connssl->stream_sizes);
if(sspi_status != SEC_E_OK) {
*err = CURLE_SEND_ERROR;
return -1;
}
}
/* check if the buffer is longer than the maximum message length */
if(len > connssl->stream_sizes.cbMaximumMessage) {
*err = CURLE_SEND_ERROR;
return -1;
}
/* calculate the complete message length and allocate a buffer for it */
data_len = connssl->stream_sizes.cbHeader + len +
connssl->stream_sizes.cbTrailer;
data = (unsigned char*) malloc(data_len);
if(data == NULL) {
*err = CURLE_OUT_OF_MEMORY;
return -1;
}
/* setup output buffers (header, data, trailer, empty) */
InitSecBuffer(&outbuf[0], SECBUFFER_STREAM_HEADER,
data, connssl->stream_sizes.cbHeader);
InitSecBuffer(&outbuf[1], SECBUFFER_DATA,
data + connssl->stream_sizes.cbHeader, curlx_uztoul(len));
InitSecBuffer(&outbuf[2], SECBUFFER_STREAM_TRAILER,
data + connssl->stream_sizes.cbHeader + len,
connssl->stream_sizes.cbTrailer);
InitSecBuffer(&outbuf[3], SECBUFFER_EMPTY, NULL, 0);
InitSecBufferDesc(&outbuf_desc, outbuf, 4);
/* copy data into output buffer */
memcpy(outbuf[1].pvBuffer, buf, len);
/* http://msdn.microsoft.com/en-us/library/windows/desktop/aa375390.aspx */
sspi_status = s_pSecFn->EncryptMessage(&connssl->ctxt->ctxt_handle, 0,
&outbuf_desc, 0);
/* check if the message was encrypted */
if(sspi_status == SEC_E_OK) {
written = 0;
/* send the encrypted message including header, data and trailer */
len = outbuf[0].cbBuffer + outbuf[1].cbBuffer + outbuf[2].cbBuffer;
/*
It's important to send the full message which includes the header,
encrypted payload, and trailer. Until the client receives all the
data a coherent message has not been delivered and the client
can't read any of it.
If we wanted to buffer the unwritten encrypted bytes, we would
tell the client that all data it has requested to be sent has been
sent. The unwritten encrypted bytes would be the first bytes to
send on the next invocation.
Here's the catch with this - if we tell the client that all the
bytes have been sent, will the client call this method again to
send the buffered data? Looking at who calls this function, it
seems the answer is NO.
*/
/* send entire message or fail */
while(len > (size_t)written) {
ssize_t this_write;
long timeleft;
int what;
this_write = 0;
timeleft = Curl_timeleft(conn->data, NULL, TRUE);
if(timeleft < 0) {
/* we already got the timeout */
failf(conn->data, "schannel: timed out sending data "
"(bytes sent: %zd)", written);
*err = CURLE_OPERATION_TIMEDOUT;
written = -1;
break;
}
what = Curl_socket_ready(CURL_SOCKET_BAD, conn->sock[sockindex],
timeleft);
if(what < 0) {
/* fatal error */
failf(conn->data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
*err = CURLE_SEND_ERROR;
written = -1;
break;
}
else if(0 == what) {
failf(conn->data, "schannel: timed out sending data "
"(bytes sent: %zd)", written);
*err = CURLE_OPERATION_TIMEDOUT;
written = -1;
break;
}
/* socket is writable */
code = Curl_write_plain(conn, conn->sock[sockindex], data + written,
len - written, &this_write);
if(code == CURLE_AGAIN)
continue;
else if(code != CURLE_OK) {
*err = code;
written = -1;
break;
}
written += this_write;
}
}
else if(sspi_status == SEC_E_INSUFFICIENT_MEMORY) {
*err = CURLE_OUT_OF_MEMORY;
}
else{
*err = CURLE_SEND_ERROR;
}
Curl_safefree(data);
if(len == (size_t)written)
/* Encrypted message including header, data and trailer entirely sent.
The return value is the number of unencrypted bytes that were sent. */
written = outbuf[1].cbBuffer;
return written;
}
static CURLcode
schannel_connect_step2(struct connectdata *conn, int sockindex)
{
int i;
ssize_t nread = -1, written = -1;
struct SessionHandle *data = conn->data;
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
SecBuffer outbuf[2];
SecBufferDesc outbuf_desc;
SecBuffer inbuf[2];
SecBufferDesc inbuf_desc;
SECURITY_STATUS sspi_status = SEC_E_OK;
TCHAR *host_name;
CURLcode code;
bool doread;
doread = (connssl->connecting_state != ssl_connect_2_writing) ? TRUE : FALSE;
infof(data, "schannel: SSL/TLS connection with %s port %hu (step 2/3)\n",
conn->host.name, conn->remote_port);
/* buffer to store previously received and encrypted data */
if(connssl->encdata_buffer == NULL) {
connssl->encdata_offset = 0;
connssl->encdata_length = CURL_SCHANNEL_BUFFER_INIT_SIZE;
connssl->encdata_buffer = malloc(connssl->encdata_length);
if(connssl->encdata_buffer == NULL) {
failf(data, "schannel: unable to allocate memory");
return CURLE_OUT_OF_MEMORY;
}
}
/* if we need a bigger buffer to read a full message, increase buffer now */
if(connssl->encdata_length - connssl->encdata_offset <
CURL_SCHANNEL_BUFFER_FREE_SIZE) {
/* increase internal encrypted data buffer */
connssl->encdata_length *= CURL_SCHANNEL_BUFFER_STEP_FACTOR;
connssl->encdata_buffer = realloc(connssl->encdata_buffer,
connssl->encdata_length);
if(connssl->encdata_buffer == NULL) {
failf(data, "schannel: unable to re-allocate memory");
return CURLE_OUT_OF_MEMORY;
}
}
for(;;) {
if(doread) {
/* read encrypted handshake data from socket */
code = Curl_read_plain(conn->sock[sockindex],
(char *) (connssl->encdata_buffer + connssl->encdata_offset),
connssl->encdata_length - connssl->encdata_offset,
&nread);
if(code == CURLE_AGAIN) {
if(connssl->connecting_state != ssl_connect_2_writing)
connssl->connecting_state = ssl_connect_2_reading;
infof(data, "schannel: failed to receive handshake, "
"need more data\n");
return CURLE_OK;
}
else if((code != CURLE_OK) || (nread == 0)) {
failf(data, "schannel: failed to receive handshake, "
"SSL/TLS connection failed");
return CURLE_SSL_CONNECT_ERROR;
}
/* increase encrypted data buffer offset */
connssl->encdata_offset += nread;
}
infof(data, "schannel: encrypted data buffer: offset %zu length %zu\n",
connssl->encdata_offset, connssl->encdata_length);
/* setup input buffers */
InitSecBuffer(&inbuf[0], SECBUFFER_TOKEN, malloc(connssl->encdata_offset),
curlx_uztoul(connssl->encdata_offset));
InitSecBuffer(&inbuf[1], SECBUFFER_EMPTY, NULL, 0);
InitSecBufferDesc(&inbuf_desc, inbuf, 2);
/* setup output buffers */
InitSecBuffer(&outbuf[0], SECBUFFER_TOKEN, NULL, 0);
InitSecBuffer(&outbuf[1], SECBUFFER_ALERT, NULL, 0);
InitSecBufferDesc(&outbuf_desc, outbuf, 2);
if(inbuf[0].pvBuffer == NULL) {
failf(data, "schannel: unable to allocate memory");
return CURLE_OUT_OF_MEMORY;
}
/* copy received handshake data into input buffer */
memcpy(inbuf[0].pvBuffer, connssl->encdata_buffer,
connssl->encdata_offset);
host_name = Curl_convert_UTF8_to_tchar(conn->host.name);
if(!host_name)
return CURLE_OUT_OF_MEMORY;
/* http://msdn.microsoft.com/en-us/library/windows/desktop/aa375924.aspx */
sspi_status = s_pSecFn->InitializeSecurityContext(
&connssl->cred->cred_handle, &connssl->ctxt->ctxt_handle,
host_name, connssl->req_flags, 0, 0, &inbuf_desc, 0, NULL,
&outbuf_desc, &connssl->ret_flags, &connssl->ctxt->time_stamp);
Curl_unicodefree(host_name);
/* free buffer for received handshake data */
Curl_safefree(inbuf[0].pvBuffer);
/* check if the handshake was incomplete */
if(sspi_status == SEC_E_INCOMPLETE_MESSAGE) {
connssl->connecting_state = ssl_connect_2_reading;
infof(data, "schannel: received incomplete message, need more data\n");
return CURLE_OK;
}
/* check if the handshake needs to be continued */
if(sspi_status == SEC_I_CONTINUE_NEEDED || sspi_status == SEC_E_OK) {
for(i = 0; i < 2; i++) {
/* search for handshake tokens that need to be send */
if(outbuf[i].BufferType == SECBUFFER_TOKEN && outbuf[i].cbBuffer > 0) {
infof(data, "schannel: sending next handshake data: "
"sending %lu bytes...\n", outbuf[i].cbBuffer);
/* send handshake token to server */
code = Curl_write_plain(conn, conn->sock[sockindex],
outbuf[i].pvBuffer, outbuf[i].cbBuffer,
&written);
if((code != CURLE_OK) || (outbuf[i].cbBuffer != (size_t)written)) {
failf(data, "schannel: failed to send next handshake data: "
"sent %zd of %lu bytes", written, outbuf[i].cbBuffer);
return CURLE_SSL_CONNECT_ERROR;
}
}
/* free obsolete buffer */
if(outbuf[i].pvBuffer != NULL) {
s_pSecFn->FreeContextBuffer(outbuf[i].pvBuffer);
}
}
}
else {
if(sspi_status == SEC_E_WRONG_PRINCIPAL)
failf(data, "schannel: SNI or certificate check failed: %s",
Curl_sspi_strerror(conn, sspi_status));
else
failf(data, "schannel: next InitializeSecurityContext failed: %s",
Curl_sspi_strerror(conn, sspi_status));
return CURLE_SSL_CONNECT_ERROR;
}
/* check if there was additional remaining encrypted data */
if(inbuf[1].BufferType == SECBUFFER_EXTRA && inbuf[1].cbBuffer > 0) {
infof(data, "schannel: encrypted data length: %lu\n", inbuf[1].cbBuffer);
/*
There are two cases where we could be getting extra data here:
1) If we're renegotiating a connection and the handshake is already
complete (from the server perspective), it can encrypted app data
(not handshake data) in an extra buffer at this point.
2) (sspi_status == SEC_I_CONTINUE_NEEDED) We are negotiating a
connection and this extra data is part of the handshake.
We should process the data immediately; waiting for the socket to
be ready may fail since the server is done sending handshake data.
*/
/* check if the remaining data is less than the total amount
and therefore begins after the already processed data */
if(connssl->encdata_offset > inbuf[1].cbBuffer) {
memmove(connssl->encdata_buffer,
(connssl->encdata_buffer + connssl->encdata_offset) -
inbuf[1].cbBuffer, inbuf[1].cbBuffer);
connssl->encdata_offset = inbuf[1].cbBuffer;
if(sspi_status == SEC_I_CONTINUE_NEEDED) {
doread = FALSE;
continue;
}
}
}
else {
connssl->encdata_offset = 0;
}
break;
}
/* check if the handshake needs to be continued */
if(sspi_status == SEC_I_CONTINUE_NEEDED) {
connssl->connecting_state = ssl_connect_2_reading;
return CURLE_OK;
}
/* check if the handshake is complete */
if(sspi_status == SEC_E_OK) {
connssl->connecting_state = ssl_connect_3;
infof(data, "schannel: SSL/TLS handshake complete\n");
}
#ifdef _WIN32_WCE
/* Windows CE doesn't do any server certificate validation.
We have to do it manually. */
if(data->set.ssl.verifypeer)
return verify_certificate(conn, sockindex);
#endif
return CURLE_OK;
}
static CURLcode
schannel_connect_step1(struct connectdata *conn, int sockindex)
{
ssize_t written = -1;
struct SessionHandle *data = conn->data;
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
SecBuffer outbuf;
SecBufferDesc outbuf_desc;
SCHANNEL_CRED schannel_cred;
SECURITY_STATUS sspi_status = SEC_E_OK;
struct curl_schannel_cred *old_cred = NULL;
struct in_addr addr;
#ifdef ENABLE_IPV6
struct in6_addr addr6;
#endif
TCHAR *host_name;
CURLcode code;
infof(data, "schannel: SSL/TLS connection with %s port %hu (step 1/3)\n",
conn->host.name, conn->remote_port);
/* check for an existing re-usable credential handle */
if(!Curl_ssl_getsessionid(conn, (void**)&old_cred, NULL)) {
connssl->cred = old_cred;
infof(data, "schannel: re-using existing credential handle\n");
}
else {
/* setup Schannel API options */
memset(&schannel_cred, 0, sizeof(schannel_cred));
schannel_cred.dwVersion = SCHANNEL_CRED_VERSION;
if(data->set.ssl.verifypeer) {
#ifdef _WIN32_WCE
/* certificate validation on CE doesn't seem to work right; we'll
do it following a more manual process. */
schannel_cred.dwFlags = SCH_CRED_MANUAL_CRED_VALIDATION |
SCH_CRED_IGNORE_NO_REVOCATION_CHECK |
SCH_CRED_IGNORE_REVOCATION_OFFLINE;
#else
schannel_cred.dwFlags = SCH_CRED_AUTO_CRED_VALIDATION |
SCH_CRED_REVOCATION_CHECK_CHAIN;
#endif
infof(data, "schannel: checking server certificate revocation\n");
}
else {
schannel_cred.dwFlags = SCH_CRED_MANUAL_CRED_VALIDATION |
SCH_CRED_IGNORE_NO_REVOCATION_CHECK |
SCH_CRED_IGNORE_REVOCATION_OFFLINE;
infof(data, "schannel: disable server certificate revocation checks\n");
}
if(Curl_inet_pton(AF_INET, conn->host.name, &addr)
#ifdef ENABLE_IPV6
|| Curl_inet_pton(AF_INET6, conn->host.name, &addr6)
#endif
) {
schannel_cred.dwFlags |= SCH_CRED_NO_SERVERNAME_CHECK;
infof(data, "schannel: using IP address, SNI is being disabled by "
"disabling the servername check against the "
"subject names in server certificates.\n");
}
if(!data->set.ssl.verifyhost) {
schannel_cred.dwFlags |= SCH_CRED_NO_SERVERNAME_CHECK;
infof(data, "schannel: verifyhost setting prevents Schannel from "
"comparing the supplied target name with the subject "
"names in server certificates. Also disables SNI.\n");
}
switch(data->set.ssl.version) {
case CURL_SSLVERSION_TLSv1:
schannel_cred.grbitEnabledProtocols = SP_PROT_TLS1_0_CLIENT |
SP_PROT_TLS1_1_CLIENT |
SP_PROT_TLS1_2_CLIENT;
break;
case CURL_SSLVERSION_SSLv3:
schannel_cred.grbitEnabledProtocols = SP_PROT_SSL3_CLIENT;
break;
case CURL_SSLVERSION_SSLv2:
schannel_cred.grbitEnabledProtocols = SP_PROT_SSL2_CLIENT;
break;
}
/* allocate memory for the re-usable credential handle */
connssl->cred = malloc(sizeof(struct curl_schannel_cred));
if(!connssl->cred) {
failf(data, "schannel: unable to allocate memory");
return CURLE_OUT_OF_MEMORY;
}
memset(connssl->cred, 0, sizeof(struct curl_schannel_cred));
/* http://msdn.microsoft.com/en-us/library/windows/desktop/aa374716.aspx */
sspi_status = s_pSecFn->AcquireCredentialsHandle(NULL, (TCHAR *)UNISP_NAME,
SECPKG_CRED_OUTBOUND, NULL, &schannel_cred, NULL, NULL,
&connssl->cred->cred_handle, &connssl->cred->time_stamp);
if(sspi_status != SEC_E_OK) {
if(sspi_status == SEC_E_WRONG_PRINCIPAL)
failf(data, "schannel: SNI or certificate check failed: %s",
Curl_sspi_strerror(conn, sspi_status));
else
failf(data, "schannel: AcquireCredentialsHandle failed: %s",
Curl_sspi_strerror(conn, sspi_status));
Curl_safefree(connssl->cred);
return CURLE_SSL_CONNECT_ERROR;
}
}
/* setup output buffer */
InitSecBuffer(&outbuf, SECBUFFER_EMPTY, NULL, 0);
InitSecBufferDesc(&outbuf_desc, &outbuf, 1);
/* setup request flags */
connssl->req_flags = ISC_REQ_SEQUENCE_DETECT | ISC_REQ_REPLAY_DETECT |
ISC_REQ_CONFIDENTIALITY | ISC_REQ_ALLOCATE_MEMORY |
ISC_REQ_STREAM;
/* allocate memory for the security context handle */
connssl->ctxt = malloc(sizeof(struct curl_schannel_ctxt));
if(!connssl->ctxt) {
failf(data, "schannel: unable to allocate memory");
return CURLE_OUT_OF_MEMORY;
}
memset(connssl->ctxt, 0, sizeof(struct curl_schannel_ctxt));
host_name = Curl_convert_UTF8_to_tchar(conn->host.name);
if(!host_name)
return CURLE_OUT_OF_MEMORY;
/* http://msdn.microsoft.com/en-us/library/windows/desktop/aa375924.aspx */
sspi_status = s_pSecFn->InitializeSecurityContext(
&connssl->cred->cred_handle, NULL, host_name,
connssl->req_flags, 0, 0, NULL, 0, &connssl->ctxt->ctxt_handle,
&outbuf_desc, &connssl->ret_flags, &connssl->ctxt->time_stamp);
Curl_unicodefree(host_name);
if(sspi_status != SEC_I_CONTINUE_NEEDED) {
if(sspi_status == SEC_E_WRONG_PRINCIPAL)
failf(data, "schannel: SNI or certificate check failed: %s",
Curl_sspi_strerror(conn, sspi_status));
else
failf(data, "schannel: initial InitializeSecurityContext failed: %s",
Curl_sspi_strerror(conn, sspi_status));
Curl_safefree(connssl->ctxt);
return CURLE_SSL_CONNECT_ERROR;
}
infof(data, "schannel: sending initial handshake data: "
"sending %lu bytes...\n", outbuf.cbBuffer);
/* send initial handshake data which is now stored in output buffer */
code = Curl_write_plain(conn, conn->sock[sockindex], outbuf.pvBuffer,
outbuf.cbBuffer, &written);
s_pSecFn->FreeContextBuffer(outbuf.pvBuffer);
if((code != CURLE_OK) || (outbuf.cbBuffer != (size_t)written)) {
failf(data, "schannel: failed to send initial handshake data: "
"sent %zd of %lu bytes", written, outbuf.cbBuffer);
return CURLE_SSL_CONNECT_ERROR;
}
infof(data, "schannel: sent initial handshake data: "
"sent %zd bytes\n", written);
/* continue to second handshake step */
connssl->connecting_state = ssl_connect_2;
return CURLE_OK;
}
int Curl_schannel_shutdown(struct connectdata *conn, int sockindex)
{
/* See http://msdn.microsoft.com/en-us/library/windows/desktop/aa380138.aspx
* Shutting Down an Schannel Connection
*/
struct SessionHandle *data = conn->data;
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
struct curl_schannel_cred *cached_cred = NULL;
infof(data, "schannel: shutting down SSL/TLS connection with %s port %hu\n",
conn->host.name, conn->remote_port);
if(connssl->cred && connssl->ctxt) {
SecBufferDesc BuffDesc;
SecBuffer Buffer;
SECURITY_STATUS sspi_status;
SecBuffer outbuf;
SecBufferDesc outbuf_desc;
CURLcode code;
TCHAR *host_name;
DWORD dwshut = SCHANNEL_SHUTDOWN;
InitSecBuffer(&Buffer, SECBUFFER_TOKEN, &dwshut, sizeof(dwshut));
InitSecBufferDesc(&BuffDesc, &Buffer, 1);
sspi_status = s_pSecFn->ApplyControlToken(&connssl->ctxt->ctxt_handle,
&BuffDesc);
if(sspi_status != SEC_E_OK)
failf(data, "schannel: ApplyControlToken failure: %s",
Curl_sspi_strerror(conn, sspi_status));
host_name = Curl_convert_UTF8_to_tchar(conn->host.name);
if(!host_name)
return CURLE_OUT_OF_MEMORY;
/* setup output buffer */
InitSecBuffer(&outbuf, SECBUFFER_EMPTY, NULL, 0);
InitSecBufferDesc(&outbuf_desc, &outbuf, 1);
sspi_status = s_pSecFn->InitializeSecurityContext(
&connssl->cred->cred_handle,
&connssl->ctxt->ctxt_handle,
host_name,
connssl->req_flags,
0,
0,
NULL,
0,
&connssl->ctxt->ctxt_handle,
&outbuf_desc,
&connssl->ret_flags,
&connssl->ctxt->time_stamp);
Curl_unicodefree(host_name);
if((sspi_status == SEC_E_OK) || (sspi_status == SEC_I_CONTEXT_EXPIRED)) {
/* send close message which is in output buffer */
ssize_t written;
code = Curl_write_plain(conn, conn->sock[sockindex], outbuf.pvBuffer,
outbuf.cbBuffer, &written);
s_pSecFn->FreeContextBuffer(outbuf.pvBuffer);
if((code != CURLE_OK) || (outbuf.cbBuffer != (size_t)written)) {
infof(data, "schannel: failed to send close msg: %s"
" (bytes written: %zd)\n", curl_easy_strerror(code), written);
}
}
/* free SSPI Schannel API security context handle */
if(connssl->ctxt) {
infof(data, "schannel: clear security context handle\n");
s_pSecFn->DeleteSecurityContext(&connssl->ctxt->ctxt_handle);
Curl_safefree(connssl->ctxt);
}
/* free SSPI Schannel API credential handle */
if(connssl->cred) {
/* decrement the reference counter of the credential/session handle */
if(connssl->cred->refcount > 0) {
connssl->cred->refcount--;
infof(data, "schannel: decremented credential handle refcount = %d\n",
connssl->cred->refcount);
}
/* if the handle refcount is zero, check if we have not cached it */
if(connssl->cred->refcount == 0) {
if(Curl_ssl_getsessionid(conn, (void**)&cached_cred, NULL)) {
cached_cred = NULL;
}
/* if the handle was not cached, it is stale to be freed */
if(connssl->cred != cached_cred) {
infof(data, "schannel: clear credential handle\n");
s_pSecFn->FreeCredentialsHandle(&connssl->cred->cred_handle);
Curl_safefree(connssl->cred);
}
}
}
}
/* free internal buffer for received encrypted data */
if(connssl->encdata_buffer != NULL) {
Curl_safefree(connssl->encdata_buffer);
connssl->encdata_length = 0;
connssl->encdata_offset = 0;
}
/* free internal buffer for received decrypted data */
if(connssl->decdata_buffer != NULL) {
Curl_safefree(connssl->decdata_buffer);
connssl->decdata_length = 0;
connssl->decdata_offset = 0;
}
return CURLE_OK;
}
int Curl_schannel_shutdown(struct connectdata *conn, int sockindex)
{
/* See
http://msdn.microsoft.com/en-us/library/windows/desktop/aa380138(v=vs.85).aspx
Shutting Down an Schannel Connection */
struct SessionHandle *data = conn->data;
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
infof(data, "schannel: shutting down SSL/TLS connection with %s port %hu\n",
conn->host.name, conn->remote_port);
if(connssl->ctxt) {
SecBufferDesc BuffDesc;
SecBuffer Buffer;
SECURITY_STATUS sspi_status;
SecBuffer outbuf;
SecBufferDesc outbuf_desc;
CURLcode code;
TCHAR *host_name;
DWORD dwshut = SCHANNEL_SHUTDOWN;
InitSecBuffer(&Buffer, SECBUFFER_TOKEN, &dwshut, sizeof(dwshut));
InitSecBufferDesc(&BuffDesc, &Buffer, 1);
sspi_status = s_pSecFn->ApplyControlToken(&connssl->ctxt->ctxt_handle,
&BuffDesc);
if(sspi_status != SEC_E_OK)
failf(data, "schannel: ApplyControlToken failure: %s",
Curl_sspi_strerror(conn, sspi_status));
#ifdef UNICODE
host_name = Curl_convert_UTF8_to_wchar(conn->host.name);
if(!host_name)
return CURLE_OUT_OF_MEMORY;
#else
host_name = conn->host.name;
#endif
/* setup output buffer */
InitSecBuffer(&outbuf, SECBUFFER_EMPTY, NULL, 0);
InitSecBufferDesc(&outbuf_desc, &outbuf, 1);
sspi_status = s_pSecFn->InitializeSecurityContext(
&connssl->cred->cred_handle,
&connssl->ctxt->ctxt_handle,
host_name,
connssl->req_flags,
0,
0,
NULL,
0,
&connssl->ctxt->ctxt_handle,
&outbuf_desc,
&connssl->ret_flags,
&connssl->ctxt->time_stamp);
#ifdef UNICODE
free(host_name);
#endif
if((sspi_status == SEC_E_OK) || (sspi_status == SEC_I_CONTEXT_EXPIRED)) {
/* send close message which is in output buffer */
ssize_t written;
code = Curl_write_plain(conn, conn->sock[sockindex], outbuf.pvBuffer,
outbuf.cbBuffer, &written);
s_pSecFn->FreeContextBuffer(outbuf.pvBuffer);
if((code != CURLE_OK) || (outbuf.cbBuffer != (size_t)written)) {
infof(data, "schannel: failed to send close msg: %s"
" (bytes written: %zd)\n", curl_easy_strerror(code), written);
}
}
/* free SSPI Schannel API security context handle */
if(connssl->ctxt) {
s_pSecFn->DeleteSecurityContext(&connssl->ctxt->ctxt_handle);
free(connssl->ctxt);
connssl->ctxt = NULL;
}
}
/* free internal buffer for received encrypted data */
if(connssl->encdata_buffer != NULL) {
free(connssl->encdata_buffer);
connssl->encdata_buffer = NULL;
connssl->encdata_length = 0;
connssl->encdata_offset = 0;
}
/* free internal buffer for received decrypted data */
if(connssl->decdata_buffer != NULL) {
free(connssl->decdata_buffer);
connssl->decdata_buffer = NULL;
connssl->decdata_length = 0;
connssl->decdata_offset = 0;
}
return CURLE_OK;
}