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curl/lib/socks_sspi.c
Alex Rousskov cb4e2be7c6 proxy: Support HTTPS proxy and SOCKS+HTTP(s) 
* HTTPS proxies:

An HTTPS proxy receives all transactions over an SSL/TLS connection.
Once a secure connection with the proxy is established, the user agent
uses the proxy as usual, including sending CONNECT requests to instruct
the proxy to establish a [usually secure] TCP tunnel with an origin
server. HTTPS proxies protect nearly all aspects of user-proxy
communications as opposed to HTTP proxies that receive all requests
(including CONNECT requests) in vulnerable clear text.

With HTTPS proxies, it is possible to have two concurrent _nested_
SSL/TLS sessions: the "outer" one between the user agent and the proxy
and the "inner" one between the user agent and the origin server
(through the proxy). This change adds supports for such nested sessions
as well.

A secure connection with a proxy requires its own set of the usual SSL
options (their actual descriptions differ and need polishing, see TODO):

  --proxy-cacert FILE        CA certificate to verify peer against
  --proxy-capath DIR         CA directory to verify peer against
  --proxy-cert CERT[:PASSWD] Client certificate file and password
  --proxy-cert-type TYPE     Certificate file type (DER/PEM/ENG)
  --proxy-ciphers LIST       SSL ciphers to use
  --proxy-crlfile FILE       Get a CRL list in PEM format from the file
  --proxy-insecure           Allow connections to proxies with bad certs
  --proxy-key KEY            Private key file name
  --proxy-key-type TYPE      Private key file type (DER/PEM/ENG)
  --proxy-pass PASS          Pass phrase for the private key
  --proxy-ssl-allow-beast    Allow security flaw to improve interop
  --proxy-sslv2              Use SSLv2
  --proxy-sslv3              Use SSLv3
  --proxy-tlsv1              Use TLSv1
  --proxy-tlsuser USER       TLS username
  --proxy-tlspassword STRING TLS password
  --proxy-tlsauthtype STRING TLS authentication type (default SRP)

All --proxy-foo options are independent from their --foo counterparts,
except --proxy-crlfile which defaults to --crlfile and --proxy-capath
which defaults to --capath.

Curl now also supports %{proxy_ssl_verify_result} --write-out variable,
similar to the existing %{ssl_verify_result} variable.

Supported backends: OpenSSL, GnuTLS, and NSS.

* A SOCKS proxy + HTTP/HTTPS proxy combination:

If both --socks* and --proxy options are given, Curl first connects to
the SOCKS proxy and then connects (through SOCKS) to the HTTP or HTTPS
proxy.

TODO: Update documentation for the new APIs and --proxy-* options.
Look for "Added in 7.XXX" marks.
2016-11-24 23:41:44 +01:00

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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2012 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 2009, 2011, Markus Moeller, <markus_moeller@compuserve.com>
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "curl_setup.h"
#if defined(USE_WINDOWS_SSPI) && !defined(CURL_DISABLE_PROXY)
#include "urldata.h"
#include "sendf.h"
#include "connect.h"
#include "strerror.h"
#include "timeval.h"
#include "socks.h"
#include "curl_sspi.h"
#include "curl_multibyte.h"
#include "warnless.h"
#include "strdup.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
/*
* Helper sspi error functions.
*/
static int check_sspi_err(struct connectdata *conn,
SECURITY_STATUS status,
const char* function)
{
if(status != SEC_E_OK &&
status != SEC_I_COMPLETE_AND_CONTINUE &&
status != SEC_I_COMPLETE_NEEDED &&
status != SEC_I_CONTINUE_NEEDED) {
failf(conn->data, "SSPI error: %s failed: %s", function,
Curl_sspi_strerror(conn, status));
return 1;
}
return 0;
}
/* This is the SSPI-using version of this function */
CURLcode Curl_SOCKS5_gssapi_negotiate(int sockindex,
struct connectdata *conn)
{
struct Curl_easy *data = conn->data;
curl_socket_t sock = conn->sock[sockindex];
CURLcode code;
ssize_t actualread;
ssize_t written;
int result;
/* Needs GSS-API authentication */
SECURITY_STATUS status;
unsigned long sspi_ret_flags = 0;
unsigned char gss_enc;
SecBuffer sspi_send_token, sspi_recv_token, sspi_w_token[3];
SecBufferDesc input_desc, output_desc, wrap_desc;
SecPkgContext_Sizes sspi_sizes;
CredHandle cred_handle;
CtxtHandle sspi_context;
PCtxtHandle context_handle = NULL;
SecPkgCredentials_Names names;
TimeStamp expiry;
char *service_name = NULL;
unsigned short us_length;
unsigned long qop;
unsigned char socksreq[4]; /* room for GSS-API exchange header only */
const char *service = data->set.str[STRING_PROXY_SERVICE_NAME] ?
data->set.str[STRING_PROXY_SERVICE_NAME] : "rcmd";
const size_t service_length = strlen(service);
/* GSS-API request looks like
* +----+------+-----+----------------+
* |VER | MTYP | LEN | TOKEN |
* +----+------+----------------------+
* | 1 | 1 | 2 | up to 2^16 - 1 |
* +----+------+-----+----------------+
*/
/* prepare service name */
if(strchr(service, '/')) {
service_name = strdup(service);
if(!service_name)
return CURLE_OUT_OF_MEMORY;
}
else {
service_name = malloc(service_length +
strlen(conn->socks_proxy.host.name) + 2);
if(!service_name)
return CURLE_OUT_OF_MEMORY;
snprintf(service_name, service_length +
strlen(conn->socks_proxy.host.name)+2, "%s/%s",
service, conn->socks_proxy.host.name);
}
input_desc.cBuffers = 1;
input_desc.pBuffers = &sspi_recv_token;
input_desc.ulVersion = SECBUFFER_VERSION;
sspi_recv_token.BufferType = SECBUFFER_TOKEN;
sspi_recv_token.cbBuffer = 0;
sspi_recv_token.pvBuffer = NULL;
output_desc.cBuffers = 1;
output_desc.pBuffers = &sspi_send_token;
output_desc.ulVersion = SECBUFFER_VERSION;
sspi_send_token.BufferType = SECBUFFER_TOKEN;
sspi_send_token.cbBuffer = 0;
sspi_send_token.pvBuffer = NULL;
wrap_desc.cBuffers = 3;
wrap_desc.pBuffers = sspi_w_token;
wrap_desc.ulVersion = SECBUFFER_VERSION;
cred_handle.dwLower = 0;
cred_handle.dwUpper = 0;
status = s_pSecFn->AcquireCredentialsHandle(NULL,
(TCHAR *) TEXT("Kerberos"),
SECPKG_CRED_OUTBOUND,
NULL,
NULL,
NULL,
NULL,
&cred_handle,
&expiry);
if(check_sspi_err(conn, status, "AcquireCredentialsHandle")) {
failf(data, "Failed to acquire credentials.");
free(service_name);
s_pSecFn->FreeCredentialsHandle(&cred_handle);
return CURLE_COULDNT_CONNECT;
}
/* As long as we need to keep sending some context info, and there's no */
/* errors, keep sending it... */
for(;;) {
TCHAR *sname;
sname = Curl_convert_UTF8_to_tchar(service_name);
if(!sname)
return CURLE_OUT_OF_MEMORY;
status = s_pSecFn->InitializeSecurityContext(&cred_handle,
context_handle,
sname,
ISC_REQ_MUTUAL_AUTH |
ISC_REQ_ALLOCATE_MEMORY |
ISC_REQ_CONFIDENTIALITY |
ISC_REQ_REPLAY_DETECT,
0,
SECURITY_NATIVE_DREP,
&input_desc,
0,
&sspi_context,
&output_desc,
&sspi_ret_flags,
&expiry);
Curl_unicodefree(sname);
if(sspi_recv_token.pvBuffer) {
s_pSecFn->FreeContextBuffer(sspi_recv_token.pvBuffer);
sspi_recv_token.pvBuffer = NULL;
sspi_recv_token.cbBuffer = 0;
}
if(check_sspi_err(conn, status, "InitializeSecurityContext")) {
free(service_name);
s_pSecFn->FreeCredentialsHandle(&cred_handle);
s_pSecFn->DeleteSecurityContext(&sspi_context);
if(sspi_recv_token.pvBuffer)
s_pSecFn->FreeContextBuffer(sspi_recv_token.pvBuffer);
failf(data, "Failed to initialise security context.");
return CURLE_COULDNT_CONNECT;
}
if(sspi_send_token.cbBuffer != 0) {
socksreq[0] = 1; /* GSS-API subnegotiation version */
socksreq[1] = 1; /* authentication message type */
us_length = htons((short)sspi_send_token.cbBuffer);
memcpy(socksreq+2, &us_length, sizeof(short));
code = Curl_write_plain(conn, sock, (char *)socksreq, 4, &written);
if(code || (4 != written)) {
failf(data, "Failed to send SSPI authentication request.");
free(service_name);
if(sspi_send_token.pvBuffer)
s_pSecFn->FreeContextBuffer(sspi_send_token.pvBuffer);
if(sspi_recv_token.pvBuffer)
s_pSecFn->FreeContextBuffer(sspi_recv_token.pvBuffer);
s_pSecFn->FreeCredentialsHandle(&cred_handle);
s_pSecFn->DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
code = Curl_write_plain(conn, sock, (char *)sspi_send_token.pvBuffer,
sspi_send_token.cbBuffer, &written);
if(code || (sspi_send_token.cbBuffer != (size_t)written)) {
failf(data, "Failed to send SSPI authentication token.");
free(service_name);
if(sspi_send_token.pvBuffer)
s_pSecFn->FreeContextBuffer(sspi_send_token.pvBuffer);
if(sspi_recv_token.pvBuffer)
s_pSecFn->FreeContextBuffer(sspi_recv_token.pvBuffer);
s_pSecFn->FreeCredentialsHandle(&cred_handle);
s_pSecFn->DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
}
if(sspi_send_token.pvBuffer) {
s_pSecFn->FreeContextBuffer(sspi_send_token.pvBuffer);
sspi_send_token.pvBuffer = NULL;
}
sspi_send_token.cbBuffer = 0;
if(sspi_recv_token.pvBuffer) {
s_pSecFn->FreeContextBuffer(sspi_recv_token.pvBuffer);
sspi_recv_token.pvBuffer = NULL;
}
sspi_recv_token.cbBuffer = 0;
if(status != SEC_I_CONTINUE_NEEDED)
break;
/* analyse response */
/* GSS-API response looks like
* +----+------+-----+----------------+
* |VER | MTYP | LEN | TOKEN |
* +----+------+----------------------+
* | 1 | 1 | 2 | up to 2^16 - 1 |
* +----+------+-----+----------------+
*/
result = Curl_blockread_all(conn, sock, (char *)socksreq, 4, &actualread);
if(result || (actualread != 4)) {
failf(data, "Failed to receive SSPI authentication response.");
free(service_name);
s_pSecFn->FreeCredentialsHandle(&cred_handle);
s_pSecFn->DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
/* ignore the first (VER) byte */
if(socksreq[1] == 255) { /* status / message type */
failf(data, "User was rejected by the SOCKS5 server (%u %u).",
(unsigned int)socksreq[0], (unsigned int)socksreq[1]);
free(service_name);
s_pSecFn->FreeCredentialsHandle(&cred_handle);
s_pSecFn->DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
if(socksreq[1] != 1) { /* status / messgae type */
failf(data, "Invalid SSPI authentication response type (%u %u).",
(unsigned int)socksreq[0], (unsigned int)socksreq[1]);
free(service_name);
s_pSecFn->FreeCredentialsHandle(&cred_handle);
s_pSecFn->DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
memcpy(&us_length, socksreq+2, sizeof(short));
us_length = ntohs(us_length);
sspi_recv_token.cbBuffer = us_length;
sspi_recv_token.pvBuffer = malloc(us_length);
if(!sspi_recv_token.pvBuffer) {
free(service_name);
s_pSecFn->FreeCredentialsHandle(&cred_handle);
s_pSecFn->DeleteSecurityContext(&sspi_context);
return CURLE_OUT_OF_MEMORY;
}
result = Curl_blockread_all(conn, sock, (char *)sspi_recv_token.pvBuffer,
sspi_recv_token.cbBuffer, &actualread);
if(result || (actualread != us_length)) {
failf(data, "Failed to receive SSPI authentication token.");
free(service_name);
if(sspi_recv_token.pvBuffer)
s_pSecFn->FreeContextBuffer(sspi_recv_token.pvBuffer);
s_pSecFn->FreeCredentialsHandle(&cred_handle);
s_pSecFn->DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
context_handle = &sspi_context;
}
free(service_name);
/* Everything is good so far, user was authenticated! */
status = s_pSecFn->QueryCredentialsAttributes(&cred_handle,
SECPKG_CRED_ATTR_NAMES,
&names);
s_pSecFn->FreeCredentialsHandle(&cred_handle);
if(check_sspi_err(conn, status, "QueryCredentialAttributes")) {
s_pSecFn->DeleteSecurityContext(&sspi_context);
s_pSecFn->FreeContextBuffer(names.sUserName);
failf(data, "Failed to determine user name.");
return CURLE_COULDNT_CONNECT;
}
infof(data, "SOCKS5 server authencticated user %s with GSS-API.\n",
names.sUserName);
s_pSecFn->FreeContextBuffer(names.sUserName);
/* Do encryption */
socksreq[0] = 1; /* GSS-API subnegotiation version */
socksreq[1] = 2; /* encryption message type */
gss_enc = 0; /* no data protection */
/* do confidentiality protection if supported */
if(sspi_ret_flags & ISC_REQ_CONFIDENTIALITY)
gss_enc = 2;
/* else do integrity protection */
else if(sspi_ret_flags & ISC_REQ_INTEGRITY)
gss_enc = 1;
infof(data, "SOCKS5 server supports GSS-API %s data protection.\n",
(gss_enc==0)?"no":((gss_enc==1)?"integrity":"confidentiality") );
/* force to no data protection, avoid encryption/decryption for now */
gss_enc = 0;
/*
* Sending the encryption type in clear seems wrong. It should be
* protected with gss_seal()/gss_wrap(). See RFC1961 extract below
* The NEC reference implementations on which this is based is
* therefore at fault
*
* +------+------+------+.......................+
* + ver | mtyp | len | token |
* +------+------+------+.......................+
* + 0x01 | 0x02 | 0x02 | up to 2^16 - 1 octets |
* +------+------+------+.......................+
*
* Where:
*
* - "ver" is the protocol version number, here 1 to represent the
* first version of the SOCKS/GSS-API protocol
*
* - "mtyp" is the message type, here 2 to represent a protection
* -level negotiation message
*
* - "len" is the length of the "token" field in octets
*
* - "token" is the GSS-API encapsulated protection level
*
* The token is produced by encapsulating an octet containing the
* required protection level using gss_seal()/gss_wrap() with conf_req
* set to FALSE. The token is verified using gss_unseal()/
* gss_unwrap().
*
*/
if(data->set.socks5_gssapi_nec) {
us_length = htons((short)1);
memcpy(socksreq+2, &us_length, sizeof(short));
}
else {
status = s_pSecFn->QueryContextAttributes(&sspi_context,
SECPKG_ATTR_SIZES,
&sspi_sizes);
if(check_sspi_err(conn, status, "QueryContextAttributes")) {
s_pSecFn->DeleteSecurityContext(&sspi_context);
failf(data, "Failed to query security context attributes.");
return CURLE_COULDNT_CONNECT;
}
sspi_w_token[0].cbBuffer = sspi_sizes.cbSecurityTrailer;
sspi_w_token[0].BufferType = SECBUFFER_TOKEN;
sspi_w_token[0].pvBuffer = malloc(sspi_sizes.cbSecurityTrailer);
if(!sspi_w_token[0].pvBuffer) {
s_pSecFn->DeleteSecurityContext(&sspi_context);
return CURLE_OUT_OF_MEMORY;
}
sspi_w_token[1].cbBuffer = 1;
sspi_w_token[1].pvBuffer = malloc(1);
if(!sspi_w_token[1].pvBuffer) {
s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer);
s_pSecFn->DeleteSecurityContext(&sspi_context);
return CURLE_OUT_OF_MEMORY;
}
memcpy(sspi_w_token[1].pvBuffer, &gss_enc, 1);
sspi_w_token[2].BufferType = SECBUFFER_PADDING;
sspi_w_token[2].cbBuffer = sspi_sizes.cbBlockSize;
sspi_w_token[2].pvBuffer = malloc(sspi_sizes.cbBlockSize);
if(!sspi_w_token[2].pvBuffer) {
s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer);
s_pSecFn->FreeContextBuffer(sspi_w_token[1].pvBuffer);
s_pSecFn->DeleteSecurityContext(&sspi_context);
return CURLE_OUT_OF_MEMORY;
}
status = s_pSecFn->EncryptMessage(&sspi_context,
KERB_WRAP_NO_ENCRYPT,
&wrap_desc,
0);
if(check_sspi_err(conn, status, "EncryptMessage")) {
s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer);
s_pSecFn->FreeContextBuffer(sspi_w_token[1].pvBuffer);
s_pSecFn->FreeContextBuffer(sspi_w_token[2].pvBuffer);
s_pSecFn->DeleteSecurityContext(&sspi_context);
failf(data, "Failed to query security context attributes.");
return CURLE_COULDNT_CONNECT;
}
sspi_send_token.cbBuffer = sspi_w_token[0].cbBuffer
+ sspi_w_token[1].cbBuffer
+ sspi_w_token[2].cbBuffer;
sspi_send_token.pvBuffer = malloc(sspi_send_token.cbBuffer);
if(!sspi_send_token.pvBuffer) {
s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer);
s_pSecFn->FreeContextBuffer(sspi_w_token[1].pvBuffer);
s_pSecFn->FreeContextBuffer(sspi_w_token[2].pvBuffer);
s_pSecFn->DeleteSecurityContext(&sspi_context);
return CURLE_OUT_OF_MEMORY;
}
memcpy(sspi_send_token.pvBuffer, sspi_w_token[0].pvBuffer,
sspi_w_token[0].cbBuffer);
memcpy((PUCHAR) sspi_send_token.pvBuffer +(int)sspi_w_token[0].cbBuffer,
sspi_w_token[1].pvBuffer, sspi_w_token[1].cbBuffer);
memcpy((PUCHAR) sspi_send_token.pvBuffer
+sspi_w_token[0].cbBuffer
+sspi_w_token[1].cbBuffer,
sspi_w_token[2].pvBuffer, sspi_w_token[2].cbBuffer);
s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer);
sspi_w_token[0].pvBuffer = NULL;
sspi_w_token[0].cbBuffer = 0;
s_pSecFn->FreeContextBuffer(sspi_w_token[1].pvBuffer);
sspi_w_token[1].pvBuffer = NULL;
sspi_w_token[1].cbBuffer = 0;
s_pSecFn->FreeContextBuffer(sspi_w_token[2].pvBuffer);
sspi_w_token[2].pvBuffer = NULL;
sspi_w_token[2].cbBuffer = 0;
us_length = htons((short)sspi_send_token.cbBuffer);
memcpy(socksreq+2, &us_length, sizeof(short));
}
code = Curl_write_plain(conn, sock, (char *)socksreq, 4, &written);
if(code || (4 != written)) {
failf(data, "Failed to send SSPI encryption request.");
if(sspi_send_token.pvBuffer)
s_pSecFn->FreeContextBuffer(sspi_send_token.pvBuffer);
s_pSecFn->DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
if(data->set.socks5_gssapi_nec) {
memcpy(socksreq, &gss_enc, 1);
code = Curl_write_plain(conn, sock, (char *)socksreq, 1, &written);
if(code || (1 != written)) {
failf(data, "Failed to send SSPI encryption type.");
s_pSecFn->DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
}
else {
code = Curl_write_plain(conn, sock, (char *)sspi_send_token.pvBuffer,
sspi_send_token.cbBuffer, &written);
if(code || (sspi_send_token.cbBuffer != (size_t)written)) {
failf(data, "Failed to send SSPI encryption type.");
if(sspi_send_token.pvBuffer)
s_pSecFn->FreeContextBuffer(sspi_send_token.pvBuffer);
s_pSecFn->DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
if(sspi_send_token.pvBuffer)
s_pSecFn->FreeContextBuffer(sspi_send_token.pvBuffer);
}
result = Curl_blockread_all(conn, sock, (char *)socksreq, 4, &actualread);
if(result || (actualread != 4)) {
failf(data, "Failed to receive SSPI encryption response.");
s_pSecFn->DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
/* ignore the first (VER) byte */
if(socksreq[1] == 255) { /* status / message type */
failf(data, "User was rejected by the SOCKS5 server (%u %u).",
(unsigned int)socksreq[0], (unsigned int)socksreq[1]);
s_pSecFn->DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
if(socksreq[1] != 2) { /* status / message type */
failf(data, "Invalid SSPI encryption response type (%u %u).",
(unsigned int)socksreq[0], (unsigned int)socksreq[1]);
s_pSecFn->DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
memcpy(&us_length, socksreq+2, sizeof(short));
us_length = ntohs(us_length);
sspi_w_token[0].cbBuffer = us_length;
sspi_w_token[0].pvBuffer = malloc(us_length);
if(!sspi_w_token[0].pvBuffer) {
s_pSecFn->DeleteSecurityContext(&sspi_context);
return CURLE_OUT_OF_MEMORY;
}
result = Curl_blockread_all(conn, sock, (char *)sspi_w_token[0].pvBuffer,
sspi_w_token[0].cbBuffer, &actualread);
if(result || (actualread != us_length)) {
failf(data, "Failed to receive SSPI encryption type.");
s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer);
s_pSecFn->DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
if(!data->set.socks5_gssapi_nec) {
wrap_desc.cBuffers = 2;
sspi_w_token[0].BufferType = SECBUFFER_STREAM;
sspi_w_token[1].BufferType = SECBUFFER_DATA;
sspi_w_token[1].cbBuffer = 0;
sspi_w_token[1].pvBuffer = NULL;
status = s_pSecFn->DecryptMessage(&sspi_context,
&wrap_desc,
0,
&qop);
if(check_sspi_err(conn, status, "DecryptMessage")) {
if(sspi_w_token[0].pvBuffer)
s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer);
if(sspi_w_token[1].pvBuffer)
s_pSecFn->FreeContextBuffer(sspi_w_token[1].pvBuffer);
s_pSecFn->DeleteSecurityContext(&sspi_context);
failf(data, "Failed to query security context attributes.");
return CURLE_COULDNT_CONNECT;
}
if(sspi_w_token[1].cbBuffer != 1) {
failf(data, "Invalid SSPI encryption response length (%lu).",
(unsigned long)sspi_w_token[1].cbBuffer);
if(sspi_w_token[0].pvBuffer)
s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer);
if(sspi_w_token[1].pvBuffer)
s_pSecFn->FreeContextBuffer(sspi_w_token[1].pvBuffer);
s_pSecFn->DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
memcpy(socksreq, sspi_w_token[1].pvBuffer, sspi_w_token[1].cbBuffer);
s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer);
s_pSecFn->FreeContextBuffer(sspi_w_token[1].pvBuffer);
}
else {
if(sspi_w_token[0].cbBuffer != 1) {
failf(data, "Invalid SSPI encryption response length (%lu).",
(unsigned long)sspi_w_token[0].cbBuffer);
s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer);
s_pSecFn->DeleteSecurityContext(&sspi_context);
return CURLE_COULDNT_CONNECT;
}
memcpy(socksreq, sspi_w_token[0].pvBuffer, sspi_w_token[0].cbBuffer);
s_pSecFn->FreeContextBuffer(sspi_w_token[0].pvBuffer);
}
infof(data, "SOCKS5 access with%s protection granted.\n",
(socksreq[0]==0)?"out GSS-API data":
((socksreq[0]==1)?" GSS-API integrity":" GSS-API confidentiality"));
/* For later use if encryption is required
conn->socks5_gssapi_enctype = socksreq[0];
if(socksreq[0] != 0)
conn->socks5_sspi_context = sspi_context;
else {
s_pSecFn->DeleteSecurityContext(&sspi_context);
conn->socks5_sspi_context = sspi_context;
}
*/
return CURLE_OK;
}
#endif
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