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sqWin32SSL.c
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sqWin32SSL.c
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/****************************************************************************
* PROJECT: SqueakSSL implementation for Windows
* FILE: sqWin32SSL.c
* CONTENT: SSL platform functions
*
* AUTHORS: Andreas Raab (ar)
*
* Marcel Taeumel (mt)
* Hasso Plattner Institute, Postdam, Germany
* Tobias Pape (topa)
* Hasso Plattner Institute, Postdam, Germany
*****************************************************************************/
#include <windows.h>
#include <errno.h>
#include <malloc.h>
#include "sq.h"
#include "SqueakSSL.h"
#define SECURITY_WIN32
#include <security.h>
#include <schnlsp.h>
#include <schannel.h>
#include <wincrypt.h>
/* Constants that mingw might have forgotten.
For reference see https://msdn.microsoft.com/en-us/library/aa379810.aspx
*/
#if !defined(SP_PROT_TLS1_SERVER)
#define SP_PROT_TLS1_SERVER 0x00000040
#endif
#if !defined(SP_PROT_TLS1_CLIENT)
#define SP_PROT_TLS1_CLIENT 0x00000080
#endif
#if !defined(SP_PROT_TLS1_0_SERVER)
#define SP_PROT_TLS1_0_SERVER SP_PROT_TLS1_SERVER
#endif
#if !defined(SP_PROT_TLS1_0_CLIENT)
#define SP_PROT_TLS1_0_CLIENT SP_PROT_TLS1_CLIENT
#endif
#if !defined(SP_PROT_TLS1_1_SERVER)
#define SP_PROT_TLS1_1_SERVER 0x00000100
#endif
#if !defined(SP_PROT_TLS1_1_CLIENT)
#define SP_PROT_TLS1_1_CLIENT 0x00000200
#endif
#if !defined(SP_PROT_TLS1_2_SERVER)
#define SP_PROT_TLS1_2_SERVER 0x00000400
#endif
#if !defined(SP_PROT_TLS1_2_CLIENT)
#define SP_PROT_TLS1_2_CLIENT 0x00000800
#endif
typedef struct sqSSL {
int state;
int certFlags;
int loglevel;
char *certName;
char *peerName;
char *serverName;
CredHandle sslCred;
CtxtHandle sslCtxt;
SecBufferDesc sbdIn;
SecBufferDesc sbdOut;
SecBuffer inbuf[4];
SecBuffer outbuf[4];
/* internal data buffer */
char *dataBuf;
int dataLen;
int dataMax;
SecPkgContext_StreamSizes sslSizes;
} sqSSL;
static sqSSL **handleBuf = NULL;
static sqInt handleMax = 0;
static const char* emptyString = "";
#include "pharovm/debug.h"
// Max lengh of a Certificate common name or DNS Host name
#define MAX_HOSTNAME_LENGTH 253
/********************************************************************/
/********************************************************************/
/********************************************************************/
/* sslFromHandle: Maps a handle to an SSL */
static sqSSL *sslFromHandle(sqInt handle) {
return handle < handleMax ? handleBuf[handle] : NULL;
}
/* sqPrintSBD: Prints a SecurityBuffer for debugging */
static void sqPrintSBD(char *title, SecBufferDesc sbd) {
unsigned int i;
logTrace("%s\n", title);
for(i=0; i<sbd.cBuffers; i++) {
SecBuffer *buf = sbd.pBuffers + i;
logTrace("\tbuf[%d]: %d (%d bytes) ptr=%" PRIxSQPTR "\n", i,buf->BufferType, buf->cbBuffer, (sqIntptr_t)buf->pvBuffer);
}
}
/* sqCopyExtraData: Retains any SECBUFFER_EXTRA data. */
static void sqCopyExtraData(sqSSL *ssl, SecBufferDesc sbd) {
unsigned int i;
if(sbd.pBuffers[0].BufferType == SECBUFFER_MISSING) {
logTrace("sqCopyExtra: Encountered SECBUFFER_MISSING; retaining %d bytes\n", ssl->dataLen);
return;
}
ssl->dataLen = 0;
for(i=0; i<sbd.cBuffers; i++) {
SecBuffer *buf = sbd.pBuffers + i;
if(buf->BufferType == SECBUFFER_EXTRA) {
int count = buf->cbBuffer;
char *srcPtr = (char*) buf->pvBuffer;
char *dstPtr = ssl->dataBuf + ssl->dataLen;
logTrace("sqCopyExtraData: Retaining %d bytes\n", count);
/* I *think* the extra buffers are always in input range.
Make sure that's the case or at least report it if not. */
if(srcPtr < dstPtr || (srcPtr + count) > (ssl->dataBuf + ssl->dataMax)) {
logTrace("sqCopyExtraDataSSL: Encountered out-of-range extra buffer\n");
}
if(srcPtr != dstPtr) {
/* memmove() not memcpy() since the memory mayoverlap */
memmove(dstPtr, srcPtr, count);
}
ssl->dataLen += count;
}
}
}
/* Copies the data from a SecBufferDesc to dstBuf */
static sqInt sqCopyDescToken(sqSSL *ssl, SecBufferDesc sbd, char *dstBuf, sqInt dstLen) {
unsigned int i;
int result = 0;
logTrace("sqCopyDescToken: \n");
for(i = 0; i < sbd.cBuffers; i++) {
SecBuffer *buf = sbd.pBuffers + i;
logTrace("\t type=%d, size=%d\n", buf->BufferType, buf->cbBuffer);
if(buf->BufferType == SECBUFFER_TOKEN) {
int count = buf->cbBuffer;
if(count > dstLen) return SQSSL_BUFFER_TOO_SMALL;
memcpy(dstBuf, buf->pvBuffer, count);
result += count;
dstBuf += count;
dstLen -= count;
FreeContextBuffer(buf->pvBuffer);
}
if(buf->BufferType == SECBUFFER_EXTRA) {
/* XXXX: Preserve contents for the next round */
logTrace("sqCopyDescToken: Unexpectedly encountered SECBUFFER_EXTRA\n");
}
}
return result;
}
/* Set up the local certificate for SSL */
#define MAX_NAME_SIZE 4096
static sqInt sqSetupCert(sqSSL *ssl, char *certName, int server) {
SCHANNEL_CRED sc_cred = { 0 };
SECURITY_STATUS ret;
HCERTSTORE hStore;
PCCERT_CONTEXT pContext = NULL;
DWORD dwPropSize;
WCHAR wFriendlyName[MAX_NAME_SIZE];
char bFriendlyName[MAX_NAME_SIZE];
if(certName) {
hStore = CertOpenSystemStore(0, TEXT("MY"));
if(!hStore) {
logTrace("sqSetupCert: CertOpenSystemStore failed\n");
return 0;
}
pContext = NULL;
/* Enumerate the certificate store to find the cert with the given friendly name */
while(pContext = CertEnumCertificatesInStore(hStore, pContext)) {
logTrace("Checking certificate: ");
dwPropSize = MAX_NAME_SIZE * sizeof(WCHAR);
if(!CertGetCertificateContextProperty(pContext, CERT_FRIENDLY_NAME_PROP_ID, wFriendlyName, &dwPropSize)) {
logTrace("<no friendly name>");
continue;
}
if(!WideCharToMultiByte(CP_UTF8, 0, wFriendlyName, -1, bFriendlyName, MAX_NAME_SIZE, NULL, NULL)) {
logTrace("<utf-8 conversion failure>");
continue;
}
logTrace("%s\n", bFriendlyName);
if(strcmp(certName, bFriendlyName) == 0) break;
}
if(pContext == 0) {
/* For compatibility with older versions of SqueakSSL, attempt to match against subject string */
pContext = CertFindCertificateInStore(hStore, X509_ASN_ENCODING | PKCS_7_ASN_ENCODING,
0, CERT_FIND_SUBJECT_STR_A, certName, NULL);
}
if(!pContext) {
logTrace("sqSetupCert: No suitable certificate found\n");
CertCloseStore(hStore, 0);
return 0;
}
}
sc_cred.dwVersion = SCHANNEL_CRED_VERSION;
sc_cred.dwFlags = SCH_CRED_NO_DEFAULT_CREDS | SCH_CRED_MANUAL_CRED_VALIDATION;
#define SQSSL_WIN_SERVER_PROTOS SP_PROT_TLS1_0_SERVER | SP_PROT_TLS1_1_SERVER | SP_PROT_TLS1_2_SERVER
#define SQSSL_WIN_CLIENT_PROTOS SP_PROT_TLS1_0_CLIENT | SP_PROT_TLS1_1_CLIENT | SP_PROT_TLS1_2_CLIENT
sc_cred.grbitEnabledProtocols = server ? SQSSL_WIN_SERVER_PROTOS : SQSSL_WIN_CLIENT_PROTOS;
sc_cred.dwMinimumCipherStrength = 0;
sc_cred.dwMaximumCipherStrength = 0;
if(pContext) {
sc_cred.cCreds = 1;
sc_cred.paCred = &pContext;
} else {
sc_cred.cCreds = 0;
}
ret = AcquireCredentialsHandle(NULL, UNISP_NAME,
server ? SECPKG_CRED_INBOUND : SECPKG_CRED_OUTBOUND,
NULL, &sc_cred, NULL, NULL, &ssl->sslCred, NULL);
logTrace("AquireCredentialsHandle returned: %x\n", ret);
if(pContext) {
CertCloseStore(hStore, 0);
CertFreeCertificateContext(pContext);
}
if (ret != SEC_E_OK) {
logTrace("AquireCredentialsHandle error: %x\n", ret);
return 0;
}
return 1;
}
/* sqExtractPeerName: Extract the name from the cert of the remote peer. */
static int sqExtractPeerName(sqSSL *ssl) {
SECURITY_STATUS ret;
PCCERT_CONTEXT certHandle = NULL;
PCERT_NAME_INFO certInfo = NULL;
PCERT_RDN_ATTR certAttr = NULL;
DWORD dwSize = 0;
int cbPeerName = 0;
LPTSTR tmpBuf = NULL;
DWORD cchTmpBuf = 0;
if(ssl->peerName) {
free(ssl->peerName);
ssl->peerName = NULL;
}
ret = QueryContextAttributes(&ssl->sslCtxt, SECPKG_ATTR_REMOTE_CERT_CONTEXT, (PVOID)&certHandle);
/* No credentials were provided; can't extract peer name */
if(ret == SEC_E_NO_CREDENTIALS) return 1;
if(ret != SEC_E_OK) {
logTrace("sqExtractPeerName: QueryContextAttributes failed (code = %x)\n", ret);
return 0;
}
if (ssl->certFlags == SQSSL_OK && ssl->serverName != NULL) {
// The certificate was already deemed OK by the trust evaulation.
// This includes matching anything like CN, sAN, or wildcard certs.
// Therefore, we _copy_ the server name to the peer name such
// that a match or equality comparison on the Smalltalk side wont
// fail, which is correct.
ssl->peerName = _strdup(ssl->serverName);
} else {
// Either the cert was not ok OR we weren't given a server name.
// In the former case, the Smalltalk code typically bails early but
// copying over the CN does not hurt. In the latter case, we can just
// guess the users' intention and fall back to the legacy behavior:
// copying the peername no matter what.
/* Extract CN from certificate */
cchTmpBuf = CertGetNameString(certHandle, CERT_NAME_ATTR_TYPE, 0, szOID_COMMON_NAME, NULL, 0);
tmpBuf = (LPTSTR)alloca(cchTmpBuf * sizeof(TCHAR));
CertGetNameString(certHandle, CERT_NAME_ATTR_TYPE, 0, szOID_COMMON_NAME, tmpBuf, cchTmpBuf);
#ifdef _UNICODE
/* Convert wide to UTF8 */
cbPeerName = WideCharToMultiByte(CP_UTF8, 0, tmpBuf, -1, NULL, 0, NULL, NULL);
if (cbPeerName == 0) return 0;
ssl->peerName = calloc(1, cbPeerName);
WideCharToMultiByte(CP_UTF8, 0, tmpBuf, -1, ssl->peerName, cbPeerName, NULL, NULL);
#else
ssl->peerName = _strdup(tmpBuf);
#endif
}
logTrace("sqExtractPeerName: Peer name is %s\n", ssl->peerName);
CertFreeCertificateContext(certHandle);
return 1;
}
/* sqVerifyCert: Verify the validity of the remote certificate */
static int sqVerifyCert(sqSSL *ssl, int isServer) {
SECURITY_STATUS ret;
PCCERT_CONTEXT certHandle = NULL;
PCCERT_CHAIN_CONTEXT chainContext = NULL;
CERT_CHAIN_PARA chainPara;
SSL_EXTRA_CERT_CHAIN_POLICY_PARA epp;
CERT_CHAIN_POLICY_PARA policyPara;
CERT_CHAIN_POLICY_STATUS policyStatus;
static LPSTR serverUsage[] = {
szOID_PKIX_KP_SERVER_AUTH,
szOID_SERVER_GATED_CRYPTO,
szOID_SGC_NETSCAPE
};
static LPSTR clientUsage[] = {
szOID_PKIX_KP_CLIENT_AUTH
};
ret = QueryContextAttributes(&ssl->sslCtxt, SECPKG_ATTR_REMOTE_CERT_CONTEXT, (PVOID)&certHandle);
/* No credentials were provided */
if(ret == SEC_E_NO_CREDENTIALS) {
ssl->certFlags = SQSSL_NO_CERTIFICATE;
return 1;
}
memset(&chainPara, 0, sizeof(chainPara));
chainPara.cbSize = sizeof(chainPara);
chainPara.RequestedUsage.dwType = USAGE_MATCH_TYPE_OR;
if(!isServer) {
chainPara.RequestedUsage.Usage.cUsageIdentifier = 3;
chainPara.RequestedUsage.Usage.rgpszUsageIdentifier = serverUsage;
} else {
chainPara.RequestedUsage.Usage.cUsageIdentifier = 1;
chainPara.RequestedUsage.Usage.rgpszUsageIdentifier = clientUsage;
}
if(!CertGetCertificateChain(NULL, certHandle, NULL,
certHandle->hCertStore,
&chainPara, 0, NULL, &chainContext)) {
CertFreeCertificateContext(certHandle);
ssl->certFlags = SQSSL_OTHER_ISSUE;
goto done;
}
memset(&epp, 0, sizeof(epp));
epp.cbSize = sizeof(epp);
epp.dwAuthType = AUTHTYPE_SERVER;
epp.fdwChecks = 0;
epp.pwszServerName = NULL;
memset(&policyPara, 0, sizeof(policyPara));
policyPara.cbSize = sizeof(policyPara);
policyPara.dwFlags = 0;
policyPara.pvExtraPolicyPara = &epp;
memset(&policyStatus, 0, sizeof(policyStatus));
policyStatus.cbSize = sizeof(policyStatus);
/* We loop here CertVerifyCertificateChainPolicy() returns only a
single error even if there is more than one issue with the cert. */
ssl->certFlags = 0;
while(true) {
if (!CertVerifyCertificateChainPolicy(
CERT_CHAIN_POLICY_SSL,
chainContext,
&policyPara,
&policyStatus)) {
ssl->certFlags |= SQSSL_OTHER_ISSUE;
goto done;
}
switch(policyStatus.dwError) {
case SEC_E_OK:
goto done;
case CERT_E_UNTRUSTEDROOT:
if(ssl->certFlags & SQSSL_UNTRUSTED_ROOT) goto done;
ssl->certFlags |= SQSSL_UNTRUSTED_ROOT;
epp.fdwChecks |= 0x00000100; /* SECURITY_FLAG_IGNORE_UNKNOWN_CA */
break;
case CERT_E_EXPIRED:
if(ssl->certFlags & SQSSL_CERT_EXPIRED) goto done;
ssl->certFlags |= SQSSL_CERT_EXPIRED;
epp.fdwChecks |= 0x00002000; /* SECURITY_FLAG_IGNORE_CERT_DATE_INVALID */
break;
case CERT_E_WRONG_USAGE:
if(ssl->certFlags & SQSSL_WRONG_USAGE) goto done;
ssl->certFlags |= SQSSL_WRONG_USAGE;
epp.fdwChecks |= 0x00000200; /* SECURITY_FLAG_IGNORE_WRONG_USAGE */
case CERT_E_REVOKED:
if(ssl->certFlags & SQSSL_CERT_REVOKED) goto done;
ssl->certFlags |= SQSSL_CERT_REVOKED;
epp.fdwChecks |= 0x00000080; /* SECURITY_FLAG_IGNORE_REVOCATION */
break;
default:
ssl->certFlags |= SQSSL_OTHER_ISSUE;
goto done;
}
}
done:
CertFreeCertificateChain(chainContext);
CertFreeCertificateContext(certHandle);
return 1;
}
/********************************************************************/
/********************************************************************/
/********************************************************************/
/* sqCreateSSL: Creates a new SSL instance.
Arguments: None.
Returns: SSL handle.
*/
sqInt sqCreateSSL(void) {
sqInt handle;
sqSSL *ssl = NULL;
ssl = calloc(1, sizeof(sqSSL));
ssl->sbdIn.ulVersion = SECBUFFER_VERSION;
ssl->sbdIn.cBuffers = 4;
ssl->sbdIn.pBuffers = ssl->inbuf;
ssl->sbdOut.ulVersion = SECBUFFER_VERSION;
ssl->sbdOut.cBuffers = 4;
ssl->sbdOut.pBuffers = ssl->outbuf;
/* Find a free handle */
for(handle = 1; handle < handleMax; handle++)
if(handleBuf[handle] == NULL) break;
if(handle >= handleMax) {
const int delta = 100;
int i;
/* Resize the handle buffer */
handleBuf = realloc(handleBuf, (handleMax+delta)*sizeof(void*));
for(i = handleMax; i < handleMax+delta; i++)
handleBuf[i] = NULL;
handleMax += delta;
}
handleBuf[handle] = ssl;
return handle;
}
/* sqDestroySSL: Destroys an SSL instance.
Arguments:
handle - the SSL handle
Returns: Non-zero if successful.
*/
sqInt sqDestroySSL(sqInt handle) {
sqSSL *ssl = sslFromHandle(handle);
if(ssl == NULL) return 0;
FreeCredentialsHandle(&ssl->sslCred);
DeleteSecurityContext(&ssl->sslCtxt);
if(ssl->certName) {
free(ssl->certName);
ssl->certName = NULL;
}
if(ssl->peerName) {
free(ssl->peerName);
ssl->peerName = NULL;
}
if(ssl->serverName) {
free(ssl->serverName);
ssl->serverName = NULL;
}
if(ssl->dataBuf) {
free(ssl->dataBuf);
ssl->dataBuf = NULL;
}
free(ssl);
handleBuf[handle] = NULL;
return 1;
}
/* sqConnectSSL: Start/continue an SSL client handshake.
Arguments:
handle - the SSL handle
srcBuf - the input token sent by the remote peer
srcLen - the size of the input token
dstBuf - the output buffer for a new token
dstLen - the size of the output buffer
Returns: The size of the output token or an error code.
*/
sqInt sqConnectSSL(sqInt handle, char* srcBuf, sqInt srcLen, char *dstBuf, sqInt dstLen) {
SecBufferDesc *sbdIn = NULL;
SECURITY_STATUS ret;
SCHANNEL_CRED sc_cred = { 0 };
ULONG sslFlags, retFlags;
sqSSL *ssl = sslFromHandle(handle);
LPTSTR serverName = NULL;
int ccServerName = 0;
/* Verify state of session */
if(ssl == NULL || (ssl->state != SQSSL_UNUSED && ssl->state != SQSSL_CONNECTING)) {
return SQSSL_INVALID_STATE;
}
if(ssl->dataLen + srcLen > ssl->dataMax) {
/* resize the data buffer */
ssl->dataMax += (srcLen < 4096) ? (4096) : (srcLen+1024);
ssl->dataBuf = realloc(ssl->dataBuf, ssl->dataMax);
if (!ssl->dataBuf) return SQSSL_OUT_OF_MEMORY;
}
logTrace("sqConnectSSL: input token %" PRIdSQINT " bytes\n", srcLen);
memcpy(ssl->dataBuf + ssl->dataLen, srcBuf, srcLen);
ssl->dataLen += srcLen;
/* Standard flags for SSL connection */
sslFlags =
ISC_REQ_ALLOCATE_MEMORY | ISC_REQ_CONFIDENTIALITY | ISC_REQ_EXTENDED_ERROR |
ISC_REQ_INTEGRITY | ISC_REQ_REPLAY_DETECT | ISC_REQ_STREAM |
ISC_REQ_MANUAL_CRED_VALIDATION;
/* Set up the input and output buffers */
ssl->inbuf[0].BufferType = SECBUFFER_TOKEN;
ssl->inbuf[0].cbBuffer = ssl->dataLen;
ssl->inbuf[0].pvBuffer = ssl->dataBuf;
ssl->inbuf[1].BufferType = SECBUFFER_EMPTY;
ssl->inbuf[1].cbBuffer = 0;
ssl->inbuf[1].pvBuffer = NULL;
ssl->inbuf[2].BufferType = SECBUFFER_EMPTY;
ssl->inbuf[2].cbBuffer = 0;
ssl->inbuf[2].pvBuffer = NULL;
ssl->inbuf[3].BufferType = SECBUFFER_EMPTY;
ssl->inbuf[3].cbBuffer = 0;
ssl->inbuf[3].pvBuffer = NULL;
ssl->sbdIn.cBuffers = 4;
ssl->outbuf[0].BufferType = SECBUFFER_EMPTY;
ssl->outbuf[0].cbBuffer = 0;
ssl->outbuf[0].pvBuffer = NULL;
ssl->outbuf[1].BufferType = SECBUFFER_EMPTY;
ssl->outbuf[1].cbBuffer = 0;
ssl->outbuf[1].pvBuffer = NULL;
ssl->sbdOut.cBuffers = 2;
logTrace("sqConnectSSL: Input to InitSecCtxt is %d bytes\n", ssl->dataLen);
#ifdef _UNICODE
if(ssl->serverName) {
ccServerName = MultiByteToWideChar(CP_UTF8, 0, ssl->serverName, -1, NULL, 0);
if (ccServerName == 0) {
return SQSSL_GENERIC_ERROR;
}
serverName = (LPTSTR)alloca(ccServerName * sizeof(TCHAR));
if (MultiByteToWideChar(CP_UTF8, 0, ssl->serverName, -1, serverName, ccServerName) == 0) {
return SQSSL_GENERIC_ERROR;
}
}
#else
if(ssl->serverName) serverName = ssl->serverName;
#endif
if(ssl->state == SQSSL_UNUSED) {
ssl->state = SQSSL_CONNECTING;
if (!sqSetupCert(ssl, ssl->certName, 0)) {
return SQSSL_GENERIC_ERROR;
}
ret = InitializeSecurityContext(&ssl->sslCred, NULL, serverName,
sslFlags, 0, 0, NULL, 0, &ssl->sslCtxt,
&ssl->sbdOut, &retFlags, NULL);
} else {
ret = InitializeSecurityContext(&ssl->sslCred, &ssl->sslCtxt, serverName,
sslFlags, 0, 0, &ssl->sbdIn, 0, NULL,
&ssl->sbdOut, &retFlags, NULL);
}
logTrace("InitializeSecurityContext returned: %x\n", ret);
if(ssl->loglevel) sqPrintSBD("Input Buffers:", ssl->sbdIn);
if(ssl->loglevel) sqPrintSBD("Output Buffers:", ssl->sbdOut);
if(ret != SEC_E_OK) {
int count;
/* Handle various failure conditions */
switch(ret) {
case SEC_E_INCOMPLETE_MESSAGE:
/* not enough data for the handshake to complete */
return SQSSL_NEED_MORE_DATA;
case SEC_I_CONTINUE_NEEDED:
/* Send contents back to peer and come back with more data */
count = sqCopyDescToken(ssl, ssl->sbdOut, dstBuf, dstLen);
/* Sanity checks for buffers */
if(ssl->inbuf[0].BufferType != SECBUFFER_TOKEN) {
logTrace("sqConnectSSL: Unexpected buffer[0].BufferType -- %d\n", ssl->inbuf[0].BufferType);
}
if(ssl->inbuf[2].BufferType != SECBUFFER_EMPTY) {
logTrace("sqConnectSSL: Unexpected buffer[2].BufferType -- %d\n", ssl->inbuf[0].BufferType);
}
/* If there is SECBUFFER_EXTRA in the input we need to retain it */
if(ssl->inbuf[1].BufferType == SECBUFFER_EXTRA) {
int extra = ssl->inbuf[1].cbBuffer;
logTrace("sqConnectSSL: Retaining %d token bytes\n", extra);
memmove(ssl->dataBuf, ssl->dataBuf + (ssl->dataLen - extra), extra);
ssl->dataLen = extra;
} else ssl->dataLen = 0;
/* Don't return zero (SQSSL_OK) when more data is needed */
return count ? count : SQSSL_NEED_MORE_DATA;
default:
logTrace("Unexpected return code %lu\n", (unsigned long)ret);
return SQSSL_GENERIC_ERROR;
}
}
/* TODO: Look at retFlags */
ssl->state = SQSSL_CONNECTED;
/* If there is SECBUFFER_EXTRA in the input we need to retain it */
if(ssl->inbuf[1].BufferType == SECBUFFER_EXTRA) {
int extra = ssl->inbuf[1].cbBuffer;
logTrace("sqConnectSSL: Retaining %d token bytes\n", extra);
memmove(ssl->dataBuf, ssl->dataBuf + (ssl->dataLen - extra), extra);
ssl->dataLen = extra;
} else {
sqCopyExtraData(ssl, ssl->sbdOut);
}
ret = QueryContextAttributes(&ssl->sslCtxt, SECPKG_ATTR_STREAM_SIZES, &ssl->sslSizes);
logTrace("sqConnectSSL: Maximum message size is %d bytes\n", ssl->sslSizes.cbMaximumMessage);
/* Verify the certificate (sets certFlags) */
sqVerifyCert(ssl, false);
/* Extract the peer name */
sqExtractPeerName(ssl);
return SQSSL_OK;
}
/* sqAcceptSSL: Start/continue an SSL server handshake.
Arguments:
handle - the SSL handle
srcBuf - the input token sent by the remote peer
srcLen - the size of the input token
dstBuf - the output buffer for a new token
dstLen - the size of the output buffer
Returns: The size of the output token or an error code.
*/
sqInt sqAcceptSSL(sqInt handle, char* srcBuf, sqInt srcLen, char *dstBuf, sqInt dstLen) {
SECURITY_STATUS ret;
SCHANNEL_CRED sc_cred = { 0 };
ULONG sslFlags, retFlags;
sqSSL *ssl = sslFromHandle(handle);
/* Verify state of session */
if(ssl == NULL || (ssl->state != SQSSL_UNUSED && ssl->state != SQSSL_ACCEPTING)) {
return SQSSL_INVALID_STATE;
}
/* Standard flags for SSL connection */
sslFlags =
ASC_REQ_ALLOCATE_MEMORY | ASC_REQ_CONFIDENTIALITY | ASC_REQ_EXTENDED_ERROR |
ASC_REQ_INTEGRITY | ASC_REQ_REPLAY_DETECT | ASC_REQ_STREAM;
ssl->inbuf[0].BufferType = SECBUFFER_TOKEN;
ssl->inbuf[0].cbBuffer = srcLen;
ssl->inbuf[0].pvBuffer = srcBuf;
ssl->inbuf[1].BufferType = SECBUFFER_EMPTY;
ssl->inbuf[1].cbBuffer = 0;
ssl->inbuf[1].pvBuffer = NULL;
ssl->sbdIn.cBuffers = 2;
ssl->outbuf[0].BufferType = SECBUFFER_EMPTY;
ssl->outbuf[0].cbBuffer = 0;
ssl->outbuf[0].pvBuffer = NULL;
ssl->outbuf[1].BufferType = SECBUFFER_EMPTY;
ssl->outbuf[1].cbBuffer = 0;
ssl->outbuf[1].pvBuffer = NULL;
ssl->sbdOut.cBuffers = 2;
if(ssl->state == SQSSL_UNUSED) {
ssl->state = SQSSL_ACCEPTING;
if(!sqSetupCert(ssl, ssl->certName, 1))
return SQSSL_GENERIC_ERROR;
ret = AcceptSecurityContext(&ssl->sslCred, NULL, &ssl->sbdIn, sslFlags,
SECURITY_NATIVE_DREP, &ssl->sslCtxt, &ssl->sbdOut,
&retFlags, NULL);
} else {
ret = AcceptSecurityContext(&ssl->sslCred, &ssl->sslCtxt, &ssl->sbdIn, sslFlags,
SECURITY_NATIVE_DREP, &ssl->sslCtxt, &ssl->sbdOut,
&retFlags, NULL);
}
logTrace("AcceptSecurityContext returned: %x\n", ret);
if(ret != SEC_E_OK) {
/* Handle various failure conditions */
switch(ret) {
case SEC_E_INCOMPLETE_MESSAGE:
/* not enough data for the handshake to complete */
return SQSSL_NEED_MORE_DATA;
case SEC_I_CONTINUE_NEEDED:
/* Send contents back to peer and come back with more data */
return sqCopyDescToken(ssl, ssl->sbdOut, dstBuf, dstLen);
default:
logTrace("Unexpected return code %d\n", ret);
return SQSSL_GENERIC_ERROR;
}
}
/* TODO: Look at retFlags */
ssl->state = SQSSL_CONNECTED;
ret = QueryContextAttributes(&ssl->sslCtxt, SECPKG_ATTR_STREAM_SIZES, &ssl->sslSizes);
logTrace("sqAcceptSSL: Maximum message size is %d bytes\n", ssl->sslSizes.cbMaximumMessage);
/* Verify the certificate (sets certFlags) */
sqVerifyCert(ssl, true);
/* Extract the peer name */
sqExtractPeerName(ssl);
return sqCopyDescToken(ssl, ssl->sbdOut, dstBuf, dstLen);
}
/* sqEncryptSSL: Encrypt data for SSL transmission.
Arguments:
handle - the SSL handle
srcBuf - the unencrypted input data
srcLen - the size of the input data
dstBuf - the output buffer for the encrypted contents
dstLen - the size of the output buffer
Returns: The size of the output generated or an error code.
*/
sqInt sqEncryptSSL(sqInt handle, char* srcBuf, sqInt srcLen, char *dstBuf, sqInt dstLen) {
SECURITY_STATUS ret;
sqInt total;
sqSSL *ssl = sslFromHandle(handle);
if(ssl == NULL || ssl->state != SQSSL_CONNECTED) return SQSSL_INVALID_STATE;
logTrace("sqEncryptSSL: Encrypting %" PRIdSQINT " bytes\n", srcLen);
if(srcLen > (int)ssl->sslSizes.cbMaximumMessage)
return SQSSL_INPUT_TOO_LARGE;
ssl->inbuf[0].BufferType = SECBUFFER_STREAM_HEADER;
ssl->inbuf[0].cbBuffer = ssl->sslSizes.cbHeader;
ssl->inbuf[0].pvBuffer = dstBuf;
ssl->inbuf[1].BufferType = SECBUFFER_DATA;
ssl->inbuf[1].cbBuffer = srcLen;
ssl->inbuf[1].pvBuffer = dstBuf + ssl->inbuf[0].cbBuffer;
ssl->inbuf[2].BufferType = SECBUFFER_STREAM_TRAILER;
ssl->inbuf[2].cbBuffer = ssl->sslSizes.cbTrailer;
ssl->inbuf[2].pvBuffer = dstBuf + ssl->inbuf[0].cbBuffer + ssl->inbuf[1].cbBuffer;
ssl->inbuf[3].BufferType = SECBUFFER_EMPTY;
ssl->inbuf[3].cbBuffer = 0;
ssl->inbuf[3].pvBuffer = NULL;
ssl->sbdIn.cBuffers = 4;
/* Check to ensure that encrypted contents fits dstBuf.
Fail with BUFFER_TOO_SMALL to allow caller to retry. */
total = ssl->inbuf[0].cbBuffer + ssl->inbuf[1].cbBuffer + ssl->inbuf[2].cbBuffer;
if(dstLen < total) return SQSSL_BUFFER_TOO_SMALL;
memcpy(ssl->inbuf[1].pvBuffer, srcBuf, srcLen);
logTrace("Header: %d; Data: %d; Trailer: %d\n",
ssl->inbuf[0].cbBuffer, ssl->inbuf[1].cbBuffer, ssl->inbuf[2].cbBuffer);
ret = EncryptMessage(&ssl->sslCtxt, 0, &ssl->sbdIn, 0);
if (ret != SEC_E_OK) {
logTrace("EncryptMessage returned: %x\n", ret);
return SQSSL_GENERIC_ERROR;
}
/* Return total amount of encrypted contents.
Must recompute total here since trailer may be overestimated */
total = ssl->inbuf[0].cbBuffer + ssl->inbuf[1].cbBuffer + ssl->inbuf[2].cbBuffer;
return total;
}
/* sqDecryptSSL: Decrypt data for SSL transmission.
Arguments:
handle - the SSL handle
srcBuf - the encrypted input data
srcLen - the size of the input data
dstBuf - the output buffer for the decrypted contents
dstLen - the size of the output buffer
Returns: The size of the output generated or an error code.
*/
sqInt sqDecryptSSL(sqInt handle, char* srcBuf, sqInt srcLen, char *dstBuf, sqInt dstLen) {
int i, total;
SECURITY_STATUS ret;
sqSSL *ssl = sslFromHandle(handle);
if(ssl == NULL || ssl->state != SQSSL_CONNECTED) return SQSSL_INVALID_STATE;
/* Workaround for a strange Windows issue: Directly after an SSL handshake
has completed, calling DecryptMessage() with empty input can fail with
SEC_E_INVALID_TOKEN for no apparent reason. */
if(!ssl->dataLen && !srcLen) return 0;
if(ssl->dataLen + srcLen > ssl->dataMax) {
/* resize the read buffer */
ssl->dataMax += (srcLen < 4096) ? (4096) : (srcLen+1024);
ssl->dataBuf = realloc(ssl->dataBuf, ssl->dataMax);
if(!ssl->dataBuf) return SQSSL_OUT_OF_MEMORY;
}
logTrace("sqDecryptSSL: Input data %" PRIdSQINT " bytes\n", srcLen);
memcpy(ssl->dataBuf + ssl->dataLen, srcBuf, srcLen);
ssl->dataLen += srcLen;
logTrace("sqDecryptSSL: Decrypting %d bytes\n", ssl->dataLen);
ssl->inbuf[0].BufferType = SECBUFFER_DATA;
ssl->inbuf[0].cbBuffer = ssl->dataLen;
ssl->inbuf[0].pvBuffer = ssl->dataBuf;
ssl->inbuf[1].BufferType = SECBUFFER_EMPTY;
ssl->inbuf[1].cbBuffer = 0;
ssl->inbuf[1].pvBuffer = NULL;
ssl->inbuf[2].BufferType = SECBUFFER_EMPTY;
ssl->inbuf[2].cbBuffer = 0;
ssl->inbuf[2].pvBuffer = NULL;
ssl->inbuf[3].BufferType = SECBUFFER_EMPTY;
ssl->inbuf[3].cbBuffer = 0;
ssl->inbuf[3].pvBuffer = NULL;
ssl->sbdIn.cBuffers = 4;
ret = DecryptMessage(&ssl->sslCtxt, &ssl->sbdIn, 0, 0);
if(ret == SEC_I_CONTEXT_EXPIRED) {
/* The remote has shut down the ssl session */
ssl->dataLen = 0;
return 0;
}
/* Copy the result into destination buffer */
total = 0;
for(i=0;i<4;i++) {
int buftype = ssl->inbuf[i].BufferType;
int count = ssl->inbuf[i].cbBuffer;
char *buffer = ssl->inbuf[i].pvBuffer;
logTrace("buf[%d]: %d (%d bytes) ptr=%"PRIxSQPTR"\n", i,buftype, count, (sqIntptr_t)buffer);
if(buftype == SECBUFFER_DATA) {
if(count > dstLen) return SQSSL_BUFFER_TOO_SMALL;
memcpy(dstBuf, buffer, count);
dstBuf += count;
total += count;
dstLen -= count;
}
}
/* We ran out of steam. Hopefully this was because we've produced
a bunch'o bits from the decryption. */
if(ret == SEC_E_OK || ret == SEC_E_INCOMPLETE_MESSAGE) {
/* Retain any remaining extra buffers and return output */
sqCopyExtraData(ssl, ssl->sbdIn);
/* Return the total number of bytes decrypted */
return total;
}
logTrace("DecryptMessage returned: %x\n", ret);
return SQSSL_GENERIC_ERROR;
}
/* sqGetStringPropertySSL: Retrieve a string property from SSL.
Arguments:
handle - the ssl handle
propID - the property id to retrieve
Returns: The string value of the property.
*/
char* sqGetStringPropertySSL(sqInt handle, int propID) {
sqSSL *ssl = sslFromHandle(handle);
if(ssl == NULL) return NULL;
switch(propID) {
case SQSSL_PROP_PEERNAME: return ssl->peerName;
case SQSSL_PROP_CERTNAME: return ssl->certName;
case SQSSL_PROP_SERVERNAME: return ssl->serverName;
default:
logTrace("sqGetStringPropertySSL: Unknown property ID %d\n", propID);
return NULL;
}
return NULL;
}
/* sqAddPfxCertToStore: Adds a PFX certificate to MY certificate store.
Arguments:
pfxData - the contents of the PFX certificate file
pfxLen - the length of the PFX certificate file
passData - the utf8 encoded password for the file
passLen - the size of the password
Returns: 1 on success, 0 on failure
*/
static sqInt sqAddPfxCertToStore(char *pfxData, sqInt pfxLen, char *passData, sqInt passLen) {
PCCERT_CONTEXT pContext;
HCERTSTORE pfxStore, myStore;
CRYPT_DATA_BLOB blob;
WCHAR widePass[4096];
/* Verify that this is a PFX file */
blob.cbData = pfxLen;
blob.pbData = pfxData;
if(!PFXIsPFXBlob(&blob)) return 0; /* Not a PFX blob */
/* Verify that the password is all right */
widePass[0] = 0;
if(passLen > 0) {
DWORD wideLen = MultiByteToWideChar(CP_UTF8, 0, passData, passLen, widePass, 4095);
widePass[wideLen] = 0;
}
if(!PFXVerifyPassword(&blob, widePass, 0)) return 0; /* Invalid password */
/* Import the PFX blob into a temporary store */
pfxStore = PFXImportCertStore(&blob, widePass, 0);
if(!pfxStore) return 0;
/* And copy the certificates to MY store */
myStore = CertOpenSystemStore(0, TEXT("MY"));
pContext = NULL;
while(pContext = CertEnumCertificatesInStore(pfxStore, pContext)) {
CertAddCertificateContextToStore(myStore, pContext, CERT_STORE_ADD_REPLACE_EXISTING, NULL);
}
CertCloseStore(myStore, 0);
CertCloseStore(pfxStore, 0);
return 1;
}
/* sqSetStringPropertySSL: Set a string property in SSL.
Arguments:
handle - the ssl handle
propID - the property id to retrieve
propName - the property string
propLen - the length of the property string
Returns: Non-zero if successful.
*/
sqInt sqSetStringPropertySSL(sqInt handle, int propID, char *propName, sqInt propLen) {
sqSSL *ssl = sslFromHandle(handle);
char *property = NULL;
if(ssl == NULL) return 0;
if(propLen) {
property = calloc(1, propLen+1);
memcpy(property, propName, propLen);
property[propLen] = '\0';
};
logTrace("sqSetStringPropertySSL(%d): %s\n", propID, property ? property : "(null)");
switch(propID) {
case SQSSL_PROP_CERTNAME:
if(ssl->certName) free(ssl->certName);
ssl->certName = property;
break;
case SQSSL_PROP_SERVERNAME:
if(ssl->serverName) free(ssl->serverName);
ssl->serverName = property;
break;
/* Platform specific: Adds a .PFX file to MY certificate store w/o password.
Useful for installing the default test certificate in SqueakSSL. */
case 10001:
if(property) free(property);
return sqAddPfxCertToStore(propName, propLen, NULL, 0);
default:
if(property) free(property);
logTrace("sqSetStringPropertySSL: Unknown property ID %d\n", propID);
return 0;
}
return 1;
}
/* sqGetIntPropertySSL: Retrieve an integer property from SSL.
Arguments:
handle - the ssl handle
propID - the property id to retrieve
Returns: The integer value of the property.
*/
sqInt sqGetIntPropertySSL(sqInt handle, sqInt propID) {
sqSSL *ssl = sslFromHandle(handle);
if(ssl == NULL) return 0;
switch(propID) {
case SQSSL_PROP_SSLSTATE: return ssl->state;
case SQSSL_PROP_CERTSTATE: return ssl->certFlags;
case SQSSL_PROP_VERSION: return SQSSL_VERSION;
case SQSSL_PROP_LOGLEVEL: return ssl->loglevel;
default:
logTrace("sqGetIntPropertySSL: Unknown property ID %" PRIdSQINT "\n", propID);
return 0;
}
return 0;