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schannel.c
2475 lines (2169 loc) · 81.8 KB
/
schannel.c
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2012 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 2012 - 2016, Marc Hoersken, <info@marc-hoersken.de>
* Copyright (C) 2012, Mark Salisbury, <mark.salisbury@hp.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.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.
*
***************************************************************************/
/*
* Source file for all Schannel-specific code for the TLS/SSL layer. No code
* but vtls.c should ever call or use these functions.
*/
#include "curl_setup.h"
#ifdef USE_SCHANNEL
#define EXPOSE_SCHANNEL_INTERNAL_STRUCTS
#ifndef USE_WINDOWS_SSPI
# error "Can't compile SCHANNEL support without SSPI."
#endif
#include "schannel.h"
#include "vtls.h"
#include "strcase.h"
#include "sendf.h"
#include "connect.h" /* for the connect timeout */
#include "strerror.h"
#include "select.h" /* for the socket readiness */
#include "inet_pton.h" /* for IP addr SNI check */
#include "curl_multibyte.h"
#include "warnless.h"
#include "x509asn1.h"
#include "curl_printf.h"
#include "multiif.h"
#include "version_win32.h"
/* The last #include file should be: */
#include "curl_memory.h"
#include "memdebug.h"
/* ALPN requires version 8.1 of the Windows SDK, which was
shipped with Visual Studio 2013, aka _MSC_VER 1800:
https://technet.microsoft.com/en-us/library/hh831771%28v=ws.11%29.aspx
*/
#if defined(_MSC_VER) && (_MSC_VER >= 1800) && !defined(_USING_V110_SDK71_)
# define HAS_ALPN 1
#endif
#ifndef UNISP_NAME_A
#define UNISP_NAME_A "Microsoft Unified Security Protocol Provider"
#endif
#ifndef UNISP_NAME_W
#define UNISP_NAME_W L"Microsoft Unified Security Protocol Provider"
#endif
#ifndef UNISP_NAME
#ifdef UNICODE
#define UNISP_NAME UNISP_NAME_W
#else
#define UNISP_NAME UNISP_NAME_A
#endif
#endif
#if defined(CryptStringToBinary) && defined(CRYPT_STRING_HEX)
#define HAS_CLIENT_CERT_PATH
#endif
#ifdef HAS_CLIENT_CERT_PATH
#ifdef UNICODE
#define CURL_CERT_STORE_PROV_SYSTEM CERT_STORE_PROV_SYSTEM_W
#else
#define CURL_CERT_STORE_PROV_SYSTEM CERT_STORE_PROV_SYSTEM_A
#endif
#endif
#ifndef SP_PROT_SSL2_CLIENT
#define SP_PROT_SSL2_CLIENT 0x00000008
#endif
#ifndef SP_PROT_SSL3_CLIENT
#define SP_PROT_SSL3_CLIENT 0x00000008
#endif
#ifndef SP_PROT_TLS1_CLIENT
#define SP_PROT_TLS1_CLIENT 0x00000080
#endif
#ifndef SP_PROT_TLS1_0_CLIENT
#define SP_PROT_TLS1_0_CLIENT SP_PROT_TLS1_CLIENT
#endif
#ifndef SP_PROT_TLS1_1_CLIENT
#define SP_PROT_TLS1_1_CLIENT 0x00000200
#endif
#ifndef SP_PROT_TLS1_2_CLIENT
#define SP_PROT_TLS1_2_CLIENT 0x00000800
#endif
#ifndef SCH_USE_STRONG_CRYPTO
#define SCH_USE_STRONG_CRYPTO 0x00400000
#endif
#ifndef SECBUFFER_ALERT
#define SECBUFFER_ALERT 17
#endif
/* Both schannel buffer sizes must be > 0 */
#define CURL_SCHANNEL_BUFFER_INIT_SIZE 4096
#define CURL_SCHANNEL_BUFFER_FREE_SIZE 1024
#define CERT_THUMBPRINT_STR_LEN 40
#define CERT_THUMBPRINT_DATA_LEN 20
/* Uncomment to force verbose output
* #define infof(x, y, ...) printf(y, __VA_ARGS__)
* #define failf(x, y, ...) printf(y, __VA_ARGS__)
*/
#ifndef CALG_SHA_256
# define CALG_SHA_256 0x0000800c
#endif
/* Work around typo in classic MinGW's w32api up to version 5.0,
see https://osdn.net/projects/mingw/ticket/38391 */
#if !defined(ALG_CLASS_DHASH) && defined(ALG_CLASS_HASH)
#define ALG_CLASS_DHASH ALG_CLASS_HASH
#endif
static Curl_recv schannel_recv;
static Curl_send schannel_send;
static CURLcode pkp_pin_peer_pubkey(struct Curl_easy *data,
struct connectdata *conn, int sockindex,
const char *pinnedpubkey);
static void InitSecBuffer(SecBuffer *buffer, unsigned long BufType,
void *BufDataPtr, unsigned long BufByteSize)
{
buffer->cbBuffer = BufByteSize;
buffer->BufferType = BufType;
buffer->pvBuffer = BufDataPtr;
}
static void InitSecBufferDesc(SecBufferDesc *desc, SecBuffer *BufArr,
unsigned long NumArrElem)
{
desc->ulVersion = SECBUFFER_VERSION;
desc->pBuffers = BufArr;
desc->cBuffers = NumArrElem;
}
static CURLcode
set_ssl_version_min_max(SCHANNEL_CRED *schannel_cred, struct Curl_easy *data,
struct connectdata *conn)
{
long ssl_version = SSL_CONN_CONFIG(version);
long ssl_version_max = SSL_CONN_CONFIG(version_max);
long i = ssl_version;
switch(ssl_version_max) {
case CURL_SSLVERSION_MAX_NONE:
case CURL_SSLVERSION_MAX_DEFAULT:
ssl_version_max = CURL_SSLVERSION_MAX_TLSv1_2;
break;
}
for(; i <= (ssl_version_max >> 16); ++i) {
switch(i) {
case CURL_SSLVERSION_TLSv1_0:
schannel_cred->grbitEnabledProtocols |= SP_PROT_TLS1_0_CLIENT;
break;
case CURL_SSLVERSION_TLSv1_1:
schannel_cred->grbitEnabledProtocols |= SP_PROT_TLS1_1_CLIENT;
break;
case CURL_SSLVERSION_TLSv1_2:
schannel_cred->grbitEnabledProtocols |= SP_PROT_TLS1_2_CLIENT;
break;
case CURL_SSLVERSION_TLSv1_3:
failf(data, "schannel: TLS 1.3 is not yet supported");
return CURLE_SSL_CONNECT_ERROR;
}
}
return CURLE_OK;
}
/*longest is 26, buffer is slightly bigger*/
#define LONGEST_ALG_ID 32
#define CIPHEROPTION(X) \
if(strcmp(#X, tmp) == 0) \
return X
static int
get_alg_id_by_name(char *name)
{
char tmp[LONGEST_ALG_ID] = { 0 };
char *nameEnd = strchr(name, ':');
size_t n = nameEnd ? min((size_t)(nameEnd - name), LONGEST_ALG_ID - 1) : \
min(strlen(name), LONGEST_ALG_ID - 1);
strncpy(tmp, name, n);
tmp[n] = 0;
CIPHEROPTION(CALG_MD2);
CIPHEROPTION(CALG_MD4);
CIPHEROPTION(CALG_MD5);
CIPHEROPTION(CALG_SHA);
CIPHEROPTION(CALG_SHA1);
CIPHEROPTION(CALG_MAC);
CIPHEROPTION(CALG_RSA_SIGN);
CIPHEROPTION(CALG_DSS_SIGN);
/*ifdefs for the options that are defined conditionally in wincrypt.h*/
#ifdef CALG_NO_SIGN
CIPHEROPTION(CALG_NO_SIGN);
#endif
CIPHEROPTION(CALG_RSA_KEYX);
CIPHEROPTION(CALG_DES);
#ifdef CALG_3DES_112
CIPHEROPTION(CALG_3DES_112);
#endif
CIPHEROPTION(CALG_3DES);
CIPHEROPTION(CALG_DESX);
CIPHEROPTION(CALG_RC2);
CIPHEROPTION(CALG_RC4);
CIPHEROPTION(CALG_SEAL);
#ifdef CALG_DH_SF
CIPHEROPTION(CALG_DH_SF);
#endif
CIPHEROPTION(CALG_DH_EPHEM);
#ifdef CALG_AGREEDKEY_ANY
CIPHEROPTION(CALG_AGREEDKEY_ANY);
#endif
#ifdef CALG_HUGHES_MD5
CIPHEROPTION(CALG_HUGHES_MD5);
#endif
CIPHEROPTION(CALG_SKIPJACK);
#ifdef CALG_TEK
CIPHEROPTION(CALG_TEK);
#endif
CIPHEROPTION(CALG_CYLINK_MEK);
CIPHEROPTION(CALG_SSL3_SHAMD5);
#ifdef CALG_SSL3_MASTER
CIPHEROPTION(CALG_SSL3_MASTER);
#endif
#ifdef CALG_SCHANNEL_MASTER_HASH
CIPHEROPTION(CALG_SCHANNEL_MASTER_HASH);
#endif
#ifdef CALG_SCHANNEL_MAC_KEY
CIPHEROPTION(CALG_SCHANNEL_MAC_KEY);
#endif
#ifdef CALG_SCHANNEL_ENC_KEY
CIPHEROPTION(CALG_SCHANNEL_ENC_KEY);
#endif
#ifdef CALG_PCT1_MASTER
CIPHEROPTION(CALG_PCT1_MASTER);
#endif
#ifdef CALG_SSL2_MASTER
CIPHEROPTION(CALG_SSL2_MASTER);
#endif
#ifdef CALG_TLS1_MASTER
CIPHEROPTION(CALG_TLS1_MASTER);
#endif
#ifdef CALG_RC5
CIPHEROPTION(CALG_RC5);
#endif
#ifdef CALG_HMAC
CIPHEROPTION(CALG_HMAC);
#endif
#ifdef CALG_TLS1PRF
CIPHEROPTION(CALG_TLS1PRF);
#endif
#ifdef CALG_HASH_REPLACE_OWF
CIPHEROPTION(CALG_HASH_REPLACE_OWF);
#endif
#ifdef CALG_AES_128
CIPHEROPTION(CALG_AES_128);
#endif
#ifdef CALG_AES_192
CIPHEROPTION(CALG_AES_192);
#endif
#ifdef CALG_AES_256
CIPHEROPTION(CALG_AES_256);
#endif
#ifdef CALG_AES
CIPHEROPTION(CALG_AES);
#endif
#ifdef CALG_SHA_256
CIPHEROPTION(CALG_SHA_256);
#endif
#ifdef CALG_SHA_384
CIPHEROPTION(CALG_SHA_384);
#endif
#ifdef CALG_SHA_512
CIPHEROPTION(CALG_SHA_512);
#endif
#ifdef CALG_ECDH
CIPHEROPTION(CALG_ECDH);
#endif
#ifdef CALG_ECMQV
CIPHEROPTION(CALG_ECMQV);
#endif
#ifdef CALG_ECDSA
CIPHEROPTION(CALG_ECDSA);
#endif
#ifdef CALG_ECDH_EPHEM
CIPHEROPTION(CALG_ECDH_EPHEM);
#endif
return 0;
}
static CURLcode
set_ssl_ciphers(SCHANNEL_CRED *schannel_cred, char *ciphers,
ALG_ID *algIds)
{
char *startCur = ciphers;
int algCount = 0;
while(startCur && (0 != *startCur) && (algCount < NUMOF_CIPHERS)) {
long alg = strtol(startCur, 0, 0);
if(!alg)
alg = get_alg_id_by_name(startCur);
if(alg)
algIds[algCount++] = alg;
else if(!strncmp(startCur, "USE_STRONG_CRYPTO",
sizeof("USE_STRONG_CRYPTO") - 1) ||
!strncmp(startCur, "SCH_USE_STRONG_CRYPTO",
sizeof("SCH_USE_STRONG_CRYPTO") - 1))
schannel_cred->dwFlags |= SCH_USE_STRONG_CRYPTO;
else
return CURLE_SSL_CIPHER;
startCur = strchr(startCur, ':');
if(startCur)
startCur++;
}
schannel_cred->palgSupportedAlgs = algIds;
schannel_cred->cSupportedAlgs = algCount;
return CURLE_OK;
}
#ifdef HAS_CLIENT_CERT_PATH
/* Function allocates memory for store_path only if CURLE_OK is returned */
static CURLcode
get_cert_location(TCHAR *path, DWORD *store_name, TCHAR **store_path,
TCHAR **thumbprint)
{
TCHAR *sep;
TCHAR *store_path_start;
size_t store_name_len;
sep = _tcschr(path, TEXT('\\'));
if(!sep)
return CURLE_SSL_CERTPROBLEM;
store_name_len = sep - path;
if(_tcsncmp(path, TEXT("CurrentUser"), store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_CURRENT_USER;
else if(_tcsncmp(path, TEXT("LocalMachine"), store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_LOCAL_MACHINE;
else if(_tcsncmp(path, TEXT("CurrentService"), store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_CURRENT_SERVICE;
else if(_tcsncmp(path, TEXT("Services"), store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_SERVICES;
else if(_tcsncmp(path, TEXT("Users"), store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_USERS;
else if(_tcsncmp(path, TEXT("CurrentUserGroupPolicy"),
store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_CURRENT_USER_GROUP_POLICY;
else if(_tcsncmp(path, TEXT("LocalMachineGroupPolicy"),
store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_LOCAL_MACHINE_GROUP_POLICY;
else if(_tcsncmp(path, TEXT("LocalMachineEnterprise"),
store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_LOCAL_MACHINE_ENTERPRISE;
else
return CURLE_SSL_CERTPROBLEM;
store_path_start = sep + 1;
sep = _tcschr(store_path_start, TEXT('\\'));
if(!sep)
return CURLE_SSL_CERTPROBLEM;
*thumbprint = sep + 1;
if(_tcslen(*thumbprint) != CERT_THUMBPRINT_STR_LEN)
return CURLE_SSL_CERTPROBLEM;
*sep = TEXT('\0');
*store_path = _tcsdup(store_path_start);
*sep = TEXT('\\');
if(!*store_path)
return CURLE_OUT_OF_MEMORY;
return CURLE_OK;
}
#endif
static CURLcode
schannel_acquire_credential_handle(struct Curl_easy *data,
struct connectdata *conn,
int sockindex)
{
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
SCHANNEL_CRED schannel_cred;
PCCERT_CONTEXT client_certs[1] = { NULL };
SECURITY_STATUS sspi_status = SEC_E_OK;
CURLcode result;
struct ssl_backend_data *backend = connssl->backend;
/* setup Schannel API options */
memset(&schannel_cred, 0, sizeof(schannel_cred));
schannel_cred.dwVersion = SCHANNEL_CRED_VERSION;
if(conn->ssl_config.verifypeer) {
#ifdef HAS_MANUAL_VERIFY_API
if(backend->use_manual_cred_validation)
schannel_cred.dwFlags = SCH_CRED_MANUAL_CRED_VALIDATION;
else
#endif
schannel_cred.dwFlags = SCH_CRED_AUTO_CRED_VALIDATION;
if(SSL_SET_OPTION(no_revoke)) {
schannel_cred.dwFlags |= SCH_CRED_IGNORE_NO_REVOCATION_CHECK |
SCH_CRED_IGNORE_REVOCATION_OFFLINE;
DEBUGF(infof(data, "schannel: disabled server certificate revocation "
"checks"));
}
else if(SSL_SET_OPTION(revoke_best_effort)) {
schannel_cred.dwFlags |= SCH_CRED_IGNORE_NO_REVOCATION_CHECK |
SCH_CRED_IGNORE_REVOCATION_OFFLINE | SCH_CRED_REVOCATION_CHECK_CHAIN;
DEBUGF(infof(data, "schannel: ignore revocation offline errors"));
}
else {
schannel_cred.dwFlags |= SCH_CRED_REVOCATION_CHECK_CHAIN;
DEBUGF(infof(data,
"schannel: checking server certificate revocation"));
}
}
else {
schannel_cred.dwFlags = SCH_CRED_MANUAL_CRED_VALIDATION |
SCH_CRED_IGNORE_NO_REVOCATION_CHECK |
SCH_CRED_IGNORE_REVOCATION_OFFLINE;
DEBUGF(infof(data,
"schannel: disabled server cert revocation checks"));
}
if(!conn->ssl_config.verifyhost) {
schannel_cred.dwFlags |= SCH_CRED_NO_SERVERNAME_CHECK;
DEBUGF(infof(data, "schannel: verifyhost setting prevents Schannel from "
"comparing the supplied target name with the subject "
"names in server certificates."));
}
if(!SSL_SET_OPTION(auto_client_cert)) {
schannel_cred.dwFlags &= ~SCH_CRED_USE_DEFAULT_CREDS;
schannel_cred.dwFlags |= SCH_CRED_NO_DEFAULT_CREDS;
infof(data, "schannel: disabled automatic use of client certificate");
}
else
infof(data, "schannel: enabled automatic use of client certificate");
switch(conn->ssl_config.version) {
case CURL_SSLVERSION_DEFAULT:
case CURL_SSLVERSION_TLSv1:
case CURL_SSLVERSION_TLSv1_0:
case CURL_SSLVERSION_TLSv1_1:
case CURL_SSLVERSION_TLSv1_2:
case CURL_SSLVERSION_TLSv1_3:
{
result = set_ssl_version_min_max(&schannel_cred, data, conn);
if(result != CURLE_OK)
return result;
break;
}
case CURL_SSLVERSION_SSLv3:
case CURL_SSLVERSION_SSLv2:
failf(data, "SSL versions not supported");
return CURLE_NOT_BUILT_IN;
default:
failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION");
return CURLE_SSL_CONNECT_ERROR;
}
if(SSL_CONN_CONFIG(cipher_list)) {
result = set_ssl_ciphers(&schannel_cred, SSL_CONN_CONFIG(cipher_list),
backend->algIds);
if(CURLE_OK != result) {
failf(data, "Unable to set ciphers to passed via SSL_CONN_CONFIG");
return result;
}
}
#ifdef HAS_CLIENT_CERT_PATH
/* client certificate */
if(data->set.ssl.primary.clientcert || data->set.ssl.primary.cert_blob) {
DWORD cert_store_name = 0;
TCHAR *cert_store_path = NULL;
TCHAR *cert_thumbprint_str = NULL;
CRYPT_HASH_BLOB cert_thumbprint;
BYTE cert_thumbprint_data[CERT_THUMBPRINT_DATA_LEN];
HCERTSTORE cert_store = NULL;
FILE *fInCert = NULL;
void *certdata = NULL;
size_t certsize = 0;
bool blob = data->set.ssl.primary.cert_blob != NULL;
TCHAR *cert_path = NULL;
if(blob) {
certdata = data->set.ssl.primary.cert_blob->data;
certsize = data->set.ssl.primary.cert_blob->len;
}
else {
cert_path = curlx_convert_UTF8_to_tchar(
data->set.ssl.primary.clientcert);
if(!cert_path)
return CURLE_OUT_OF_MEMORY;
result = get_cert_location(cert_path, &cert_store_name,
&cert_store_path, &cert_thumbprint_str);
if(result && (data->set.ssl.primary.clientcert[0]!='\0'))
fInCert = fopen(data->set.ssl.primary.clientcert, "rb");
if(result && !fInCert) {
failf(data, "schannel: Failed to get certificate location"
" or file for %s",
data->set.ssl.primary.clientcert);
curlx_unicodefree(cert_path);
return result;
}
}
if((fInCert || blob) && (data->set.ssl.cert_type) &&
(!strcasecompare(data->set.ssl.cert_type, "P12"))) {
failf(data, "schannel: certificate format compatibility error "
" for %s",
blob ? "(memory blob)" : data->set.ssl.primary.clientcert);
curlx_unicodefree(cert_path);
return CURLE_SSL_CERTPROBLEM;
}
if(fInCert || blob) {
/* Reading a .P12 or .pfx file, like the example at bottom of
https://social.msdn.microsoft.com/Forums/windowsdesktop/
en-US/3e7bc95f-b21a-4bcd-bd2c-7f996718cae5
*/
CRYPT_DATA_BLOB datablob;
WCHAR* pszPassword;
size_t pwd_len = 0;
int str_w_len = 0;
const char *cert_showfilename_error = blob ?
"(memory blob)" : data->set.ssl.primary.clientcert;
curlx_unicodefree(cert_path);
if(fInCert) {
long cert_tell = 0;
bool continue_reading = fseek(fInCert, 0, SEEK_END) == 0;
if(continue_reading)
cert_tell = ftell(fInCert);
if(cert_tell < 0)
continue_reading = FALSE;
else
certsize = (size_t)cert_tell;
if(continue_reading)
continue_reading = fseek(fInCert, 0, SEEK_SET) == 0;
if(continue_reading)
certdata = malloc(certsize + 1);
if((!certdata) ||
((int) fread(certdata, certsize, 1, fInCert) != 1))
continue_reading = FALSE;
fclose(fInCert);
if(!continue_reading) {
failf(data, "schannel: Failed to read cert file %s",
data->set.ssl.primary.clientcert);
free(certdata);
return CURLE_SSL_CERTPROBLEM;
}
}
/* Convert key-pair data to the in-memory certificate store */
datablob.pbData = (BYTE*)certdata;
datablob.cbData = (DWORD)certsize;
if(data->set.ssl.key_passwd)
pwd_len = strlen(data->set.ssl.key_passwd);
pszPassword = (WCHAR*)malloc(sizeof(WCHAR)*(pwd_len + 1));
if(pszPassword) {
if(pwd_len > 0)
str_w_len = MultiByteToWideChar(CP_UTF8,
MB_ERR_INVALID_CHARS,
data->set.ssl.key_passwd, (int)pwd_len,
pszPassword, (int)(pwd_len + 1));
if((str_w_len >= 0) && (str_w_len <= (int)pwd_len))
pszPassword[str_w_len] = 0;
else
pszPassword[0] = 0;
cert_store = PFXImportCertStore(&datablob, pszPassword, 0);
free(pszPassword);
}
if(!blob)
free(certdata);
if(!cert_store) {
DWORD errorcode = GetLastError();
if(errorcode == ERROR_INVALID_PASSWORD)
failf(data, "schannel: Failed to import cert file %s, "
"password is bad",
cert_showfilename_error);
else
failf(data, "schannel: Failed to import cert file %s, "
"last error is 0x%x",
cert_showfilename_error, errorcode);
return CURLE_SSL_CERTPROBLEM;
}
client_certs[0] = CertFindCertificateInStore(
cert_store, X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, 0,
CERT_FIND_ANY, NULL, NULL);
if(!client_certs[0]) {
failf(data, "schannel: Failed to get certificate from file %s"
", last error is 0x%x",
cert_showfilename_error, GetLastError());
CertCloseStore(cert_store, 0);
return CURLE_SSL_CERTPROBLEM;
}
schannel_cred.cCreds = 1;
schannel_cred.paCred = client_certs;
}
else {
cert_store =
CertOpenStore(CURL_CERT_STORE_PROV_SYSTEM, 0,
(HCRYPTPROV)NULL,
CERT_STORE_OPEN_EXISTING_FLAG | cert_store_name,
cert_store_path);
if(!cert_store) {
failf(data, "schannel: Failed to open cert store %x %s, "
"last error is 0x%x",
cert_store_name, cert_store_path, GetLastError());
free(cert_store_path);
curlx_unicodefree(cert_path);
return CURLE_SSL_CERTPROBLEM;
}
free(cert_store_path);
cert_thumbprint.pbData = cert_thumbprint_data;
cert_thumbprint.cbData = CERT_THUMBPRINT_DATA_LEN;
if(!CryptStringToBinary(cert_thumbprint_str,
CERT_THUMBPRINT_STR_LEN,
CRYPT_STRING_HEX,
cert_thumbprint_data,
&cert_thumbprint.cbData,
NULL, NULL)) {
curlx_unicodefree(cert_path);
CertCloseStore(cert_store, 0);
return CURLE_SSL_CERTPROBLEM;
}
client_certs[0] = CertFindCertificateInStore(
cert_store, X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, 0,
CERT_FIND_HASH, &cert_thumbprint, NULL);
curlx_unicodefree(cert_path);
if(client_certs[0]) {
schannel_cred.cCreds = 1;
schannel_cred.paCred = client_certs;
}
else {
/* CRYPT_E_NOT_FOUND / E_INVALIDARG */
CertCloseStore(cert_store, 0);
return CURLE_SSL_CERTPROBLEM;
}
}
CertCloseStore(cert_store, 0);
}
#else
if(data->set.ssl.primary.clientcert || data->set.ssl.primary.cert_blob) {
failf(data, "schannel: client cert support not built in");
return CURLE_NOT_BUILT_IN;
}
#endif
/* allocate memory for the re-usable credential handle */
backend->cred = (struct Curl_schannel_cred *)
calloc(1, sizeof(struct Curl_schannel_cred));
if(!backend->cred) {
failf(data, "schannel: unable to allocate memory");
if(client_certs[0])
CertFreeCertificateContext(client_certs[0]);
return CURLE_OUT_OF_MEMORY;
}
backend->cred->refcount = 1;
sspi_status =
s_pSecFn->AcquireCredentialsHandle(NULL, (TCHAR *)UNISP_NAME,
SECPKG_CRED_OUTBOUND, NULL,
&schannel_cred, NULL, NULL,
&backend->cred->cred_handle,
&backend->cred->time_stamp);
if(client_certs[0])
CertFreeCertificateContext(client_certs[0]);
if(sspi_status != SEC_E_OK) {
char buffer[STRERROR_LEN];
failf(data, "schannel: AcquireCredentialsHandle failed: %s",
Curl_sspi_strerror(sspi_status, buffer, sizeof(buffer)));
Curl_safefree(backend->cred);
switch(sspi_status) {
case SEC_E_INSUFFICIENT_MEMORY:
return CURLE_OUT_OF_MEMORY;
case SEC_E_NO_CREDENTIALS:
case SEC_E_SECPKG_NOT_FOUND:
case SEC_E_NOT_OWNER:
case SEC_E_UNKNOWN_CREDENTIALS:
case SEC_E_INTERNAL_ERROR:
default:
return CURLE_SSL_CONNECT_ERROR;
}
}
return CURLE_OK;
}
static CURLcode
schannel_connect_step1(struct Curl_easy *data, struct connectdata *conn,
int sockindex)
{
ssize_t written = -1;
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
SecBuffer outbuf;
SecBufferDesc outbuf_desc;
SecBuffer inbuf;
SecBufferDesc inbuf_desc;
#ifdef HAS_ALPN
unsigned char alpn_buffer[128];
#endif
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 result;
char * const hostname = SSL_HOST_NAME();
struct ssl_backend_data *backend = connssl->backend;
DEBUGF(infof(data,
"schannel: SSL/TLS connection with %s port %hu (step 1/3)",
hostname, conn->remote_port));
if(curlx_verify_windows_version(5, 1, 0, PLATFORM_WINNT,
VERSION_LESS_THAN_EQUAL)) {
/* Schannel in Windows XP (OS version 5.1) uses legacy handshakes and
algorithms that may not be supported by all servers. */
infof(data, "schannel: Windows version is old and may not be able to "
"connect to some servers due to lack of SNI, algorithms, etc.");
}
#ifdef HAS_ALPN
/* ALPN is only supported on Windows 8.1 / Server 2012 R2 and above.
Also it doesn't seem to be supported for Wine, see curl bug #983. */
backend->use_alpn = conn->bits.tls_enable_alpn &&
!GetProcAddress(GetModuleHandle(TEXT("ntdll")),
"wine_get_version") &&
curlx_verify_windows_version(6, 3, 0, PLATFORM_WINNT,
VERSION_GREATER_THAN_EQUAL);
#else
backend->use_alpn = false;
#endif
#ifdef _WIN32_WCE
#ifdef HAS_MANUAL_VERIFY_API
/* certificate validation on CE doesn't seem to work right; we'll
* do it following a more manual process. */
backend->use_manual_cred_validation = true;
#else
#error "compiler too old to support requisite manual cert verify for Win CE"
#endif
#else
#ifdef HAS_MANUAL_VERIFY_API
if(SSL_CONN_CONFIG(CAfile) || SSL_CONN_CONFIG(ca_info_blob)) {
if(curlx_verify_windows_version(6, 1, 0, PLATFORM_WINNT,
VERSION_GREATER_THAN_EQUAL)) {
backend->use_manual_cred_validation = true;
}
else {
failf(data, "schannel: this version of Windows is too old to support "
"certificate verification via CA bundle file.");
return CURLE_SSL_CACERT_BADFILE;
}
}
else
backend->use_manual_cred_validation = false;
#else
if(SSL_CONN_CONFIG(CAfile) || SSL_CONN_CONFIG(ca_info_blob)) {
failf(data, "schannel: CA cert support not built in");
return CURLE_NOT_BUILT_IN;
}
#endif
#endif
backend->cred = NULL;
/* check for an existing re-usable credential handle */
if(SSL_SET_OPTION(primary.sessionid)) {
Curl_ssl_sessionid_lock(data);
if(!Curl_ssl_getsessionid(data, conn,
SSL_IS_PROXY() ? TRUE : FALSE,
(void **)&old_cred, NULL, sockindex)) {
backend->cred = old_cred;
DEBUGF(infof(data, "schannel: re-using existing credential handle"));
/* increment the reference counter of the credential/session handle */
backend->cred->refcount++;
DEBUGF(infof(data,
"schannel: incremented credential handle refcount = %d",
backend->cred->refcount));
}
Curl_ssl_sessionid_unlock(data);
}
if(!backend->cred) {
result = schannel_acquire_credential_handle(data, conn, sockindex);
if(result != CURLE_OK) {
return result;
}
}
/* Warn if SNI is disabled due to use of an IP address */
if(Curl_inet_pton(AF_INET, hostname, &addr)
#ifdef ENABLE_IPV6
|| Curl_inet_pton(AF_INET6, hostname, &addr6)
#endif
) {
infof(data, "schannel: using IP address, SNI is not supported by OS.");
}
#ifdef HAS_ALPN
if(backend->use_alpn) {
int cur = 0;
int list_start_index = 0;
unsigned int *extension_len = NULL;
unsigned short* list_len = NULL;
/* The first four bytes will be an unsigned int indicating number
of bytes of data in the rest of the buffer. */
extension_len = (unsigned int *)(&alpn_buffer[cur]);
cur += sizeof(unsigned int);
/* The next four bytes are an indicator that this buffer will contain
ALPN data, as opposed to NPN, for example. */
*(unsigned int *)&alpn_buffer[cur] =
SecApplicationProtocolNegotiationExt_ALPN;
cur += sizeof(unsigned int);
/* The next two bytes will be an unsigned short indicating the number
of bytes used to list the preferred protocols. */
list_len = (unsigned short*)(&alpn_buffer[cur]);
cur += sizeof(unsigned short);
list_start_index = cur;
#ifdef USE_HTTP2
if(data->state.httpwant >= CURL_HTTP_VERSION_2) {
alpn_buffer[cur++] = ALPN_H2_LENGTH;
memcpy(&alpn_buffer[cur], ALPN_H2, ALPN_H2_LENGTH);
cur += ALPN_H2_LENGTH;
infof(data, "schannel: ALPN, offering %s", ALPN_H2);
}
#endif
alpn_buffer[cur++] = ALPN_HTTP_1_1_LENGTH;
memcpy(&alpn_buffer[cur], ALPN_HTTP_1_1, ALPN_HTTP_1_1_LENGTH);
cur += ALPN_HTTP_1_1_LENGTH;
infof(data, "schannel: ALPN, offering %s", ALPN_HTTP_1_1);
*list_len = curlx_uitous(cur - list_start_index);
*extension_len = *list_len + sizeof(unsigned int) + sizeof(unsigned short);
InitSecBuffer(&inbuf, SECBUFFER_APPLICATION_PROTOCOLS, alpn_buffer, cur);
InitSecBufferDesc(&inbuf_desc, &inbuf, 1);
}
else {
InitSecBuffer(&inbuf, SECBUFFER_EMPTY, NULL, 0);
InitSecBufferDesc(&inbuf_desc, &inbuf, 1);
}
#else /* HAS_ALPN */
InitSecBuffer(&inbuf, SECBUFFER_EMPTY, NULL, 0);
InitSecBufferDesc(&inbuf_desc, &inbuf, 1);
#endif
/* setup output buffer */
InitSecBuffer(&outbuf, SECBUFFER_EMPTY, NULL, 0);
InitSecBufferDesc(&outbuf_desc, &outbuf, 1);
/* security request flags */
backend->req_flags = ISC_REQ_SEQUENCE_DETECT | ISC_REQ_REPLAY_DETECT |
ISC_REQ_CONFIDENTIALITY | ISC_REQ_ALLOCATE_MEMORY |
ISC_REQ_STREAM;
if(!SSL_SET_OPTION(auto_client_cert)) {
backend->req_flags |= ISC_REQ_USE_SUPPLIED_CREDS;
}
/* allocate memory for the security context handle */
backend->ctxt = (struct Curl_schannel_ctxt *)
calloc(1, sizeof(struct Curl_schannel_ctxt));
if(!backend->ctxt) {
failf(data, "schannel: unable to allocate memory");
return CURLE_OUT_OF_MEMORY;
}
host_name = curlx_convert_UTF8_to_tchar(hostname);
if(!host_name)
return CURLE_OUT_OF_MEMORY;
/* Schannel InitializeSecurityContext:
https://msdn.microsoft.com/en-us/library/windows/desktop/aa375924.aspx
At the moment we don't pass inbuf unless we're using ALPN since we only
use it for that, and Wine (for which we currently disable ALPN) is giving
us problems with inbuf regardless. https://github.com/curl/curl/issues/983
*/
sspi_status = s_pSecFn->InitializeSecurityContext(
&backend->cred->cred_handle, NULL, host_name, backend->req_flags, 0, 0,
(backend->use_alpn ? &inbuf_desc : NULL),
0, &backend->ctxt->ctxt_handle,
&outbuf_desc, &backend->ret_flags, &backend->ctxt->time_stamp);
curlx_unicodefree(host_name);
if(sspi_status != SEC_I_CONTINUE_NEEDED) {
char buffer[STRERROR_LEN];
Curl_safefree(backend->ctxt);
switch(sspi_status) {
case SEC_E_INSUFFICIENT_MEMORY:
failf(data, "schannel: initial InitializeSecurityContext failed: %s",
Curl_sspi_strerror(sspi_status, buffer, sizeof(buffer)));
return CURLE_OUT_OF_MEMORY;
case SEC_E_WRONG_PRINCIPAL:
failf(data, "schannel: SNI or certificate check failed: %s",
Curl_sspi_strerror(sspi_status, buffer, sizeof(buffer)));
return CURLE_PEER_FAILED_VERIFICATION;
/*
case SEC_E_INVALID_HANDLE:
case SEC_E_INVALID_TOKEN:
case SEC_E_LOGON_DENIED:
case SEC_E_TARGET_UNKNOWN:
case SEC_E_NO_AUTHENTICATING_AUTHORITY:
case SEC_E_INTERNAL_ERROR:
case SEC_E_NO_CREDENTIALS:
case SEC_E_UNSUPPORTED_FUNCTION:
case SEC_E_APPLICATION_PROTOCOL_MISMATCH:
*/
default:
failf(data, "schannel: initial InitializeSecurityContext failed: %s",
Curl_sspi_strerror(sspi_status, buffer, sizeof(buffer)));
return CURLE_SSL_CONNECT_ERROR;
}
}
DEBUGF(infof(data, "schannel: sending initial handshake data: "
"sending %lu bytes.", outbuf.cbBuffer));
/* send initial handshake data which is now stored in output buffer */
result = Curl_write_plain(data, conn->sock[sockindex], outbuf.pvBuffer,
outbuf.cbBuffer, &written);
s_pSecFn->FreeContextBuffer(outbuf.pvBuffer);
if((result != 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;
}