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Force schannel to use RC4 to get around an schannel DES bug.

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Fix a bug where a failed tls_start would cause a loop.
Moved static variables in schannel into the tls struct.
This commit is contained in:
James Canete
2007-11-15 03:12:18 +00:00
parent 1f453d2ecf
commit dd86aedd19
3 changed files with 110 additions and 76 deletions
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3
src/auth.c
View File

@@ -247,6 +247,9 @@ static int _handle_proceedtls_default(xmpp_conn_t * const conn,
if (!tls_start(conn->tls))
{
xmpp_debug(conn->ctx, "xmpp", "Couldn't start TLS!");
tls_free(conn->tls);
conn->tls = NULL;
xmpp_disconnect(conn);
}
else
{

2
src/event.c
View File

@@ -224,7 +224,7 @@ void xmpp_run_once(xmpp_ctx_t *ctx, const unsigned long timeout)
if (conn->tls) {
if (!tls_is_recoverable(tls_error(conn->tls)))
{
xmpp_debug(ctx, "xmpp", "Unrecoverable TLS error.");
xmpp_debug(ctx, "xmpp", "Unrecoverable TLS error, %d.", tls_error(conn->tls));
conn->error = tls_error(conn->tls);
conn_disconnect(conn);
}

181
src/tls_schannel.c
View File

@@ -20,15 +20,16 @@
#include <security.h>
#include <schnlsp.h>
static HANDLE hsec32 = NULL;
static SecurityFunctionTable *sft = NULL;
static CredHandle hcred;
static SecPkgInfo *spi;
static int init = 0;
struct _tls {
xmpp_ctx_t *ctx;
sock_t sock;
HANDLE hsec32;
SecurityFunctionTable *sft;
CredHandle hcred;
SecPkgInfo *spi;
int init;
CtxtHandle hctxt;
SecPkgContext_StreamSizes spcss;
@@ -50,70 +51,66 @@ struct _tls {
void tls_initialize(void)
{
PSecurityFunctionTable (*pInitSecurityInterface)(void);
SCHANNEL_CRED scred;
int ret;
if (!(hsec32 = LoadLibrary ("secur32.dll"))) {
return;
}
if (!(pInitSecurityInterface =
(void *)GetProcAddress(hsec32, "InitSecurityInterfaceA"))) {
FreeLibrary(hsec32);
hsec32 = NULL;
return;
}
sft = pInitSecurityInterface();
if (!sft) {
sft = NULL;
FreeLibrary(hsec32);
hsec32 = NULL;
return;
}
ret = sft->QuerySecurityPackageInfo(UNISP_NAME, &spi);
memset(&scred, 0, sizeof(scred));
scred.dwVersion = SCHANNEL_CRED_VERSION;
scred.grbitEnabledProtocols = SP_PROT_TLS1_CLIENT;
sft->AcquireCredentialsHandleA(NULL, UNISP_NAME, SECPKG_CRED_OUTBOUND,
NULL, &scred, NULL, NULL, &hcred, NULL);
init = 1;
return;
}
void tls_shutdown(void)
{
if (init) {
sft->FreeCredentialsHandle(&hcred);
}
sft = NULL;
if (hsec32) {
FreeLibrary(hsec32);
hsec32 = NULL;
}
return;
}
tls_t *tls_new(xmpp_ctx_t *ctx, sock_t sock)
{
tls_t *tls = xmpp_alloc(ctx, sizeof(*tls));
tls_t *tls;
PSecurityFunctionTable (*pInitSecurityInterface)(void);
SCHANNEL_CRED scred;
int ret;
ALG_ID algs[1];
if (tls) {
memset(tls, 0, sizeof(*tls));
tls->ctx = ctx;
tls->sock = sock;
tls = xmpp_alloc(ctx, sizeof(*tls));
if (!tls) {
return NULL;
}
memset(tls, 0, sizeof(*tls));
tls->ctx = ctx;
tls->sock = sock;
if (!(tls->hsec32 = LoadLibrary ("secur32.dll"))) {
return NULL;
}
if (!(pInitSecurityInterface =
(void *)GetProcAddress(tls->hsec32, "InitSecurityInterfaceA"))) {
FreeLibrary(tls->hsec32);
tls->hsec32 = NULL;
return NULL;
}
tls->sft = pInitSecurityInterface();
if (!tls->sft) {
tls->sft = NULL;
FreeLibrary(tls->hsec32);
tls->hsec32 = NULL;
return NULL;
}
ret = tls->sft->QuerySecurityPackageInfo(UNISP_NAME, &(tls->spi));
memset(&scred, 0, sizeof(scred));
scred.dwVersion = SCHANNEL_CRED_VERSION;
/*scred.grbitEnabledProtocols = SP_PROT_TLS1_CLIENT;*/
/* Something down the line doesn't like AES, so force it to RC4 */
algs[0] = CALG_RC4;
scred.cSupportedAlgs = 1;
scred.palgSupportedAlgs = algs;
tls->sft->AcquireCredentialsHandleA(NULL, UNISP_NAME, SECPKG_CRED_OUTBOUND,
NULL, &scred, NULL, NULL, &(tls->hcred), NULL);
tls->init = 1;
return tls;
}
@@ -131,6 +128,17 @@ void tls_free(tls_t *tls)
xmpp_free(tls->ctx, tls->sendbuffer);
}
if (tls->init) {
tls->sft->FreeCredentialsHandle(&(tls->hcred));
}
tls->sft = NULL;
if (tls->hsec32) {
FreeLibrary(tls->hsec32);
tls->hsec32 = NULL;
}
xmpp_free(tls->ctx, tls);
return;
}
@@ -181,8 +189,8 @@ int tls_start(tls_t *tls)
memset(&(sbin[0]), 0, sizeof(sbin[0]));
sbin[0].BufferType = SECBUFFER_TOKEN;
sbin[0].pvBuffer = xmpp_alloc(tls->ctx, spi->cbMaxToken);
sbin[0].cbBuffer = spi->cbMaxToken;
sbin[0].pvBuffer = xmpp_alloc(tls->ctx, tls->spi->cbMaxToken);
sbin[0].cbBuffer = tls->spi->cbMaxToken;
memset(&(sbin[1]), 0, sizeof(sbin[1]));
sbin[1].BufferType = SECBUFFER_EMPTY;
@@ -192,7 +200,7 @@ int tls_start(tls_t *tls)
sbdin.cBuffers = 2;
sbdin.pBuffers = sbin;
ret = sft->InitializeSecurityContextA(&hcred, NULL, name, ctxtreq, 0, 0,
ret = tls->sft->InitializeSecurityContextA(&(tls->hcred), NULL, name, ctxtreq, 0, 0,
NULL, 0, &(tls->hctxt), &sbdout,
&ctxtattr, NULL);
@@ -202,16 +210,26 @@ int tls_start(tls_t *tls)
int len = 0, inbytes = 0;
if (sbdout.pBuffers[0].cbBuffer) {
sent = sock_write(tls->sock, sbdout.pBuffers[0].pvBuffer,
sbdout.pBuffers[0].cbBuffer);
sft->FreeContextBuffer(sbdout.pBuffers[0].pvBuffer);
unsigned char *writebuff = sbdout.pBuffers[0].pvBuffer;
unsigned int writelen = sbdout.pBuffers[0].cbBuffer;
sent = sock_write(tls->sock, writebuff, writelen);
if (sent == -1) {
tls->lasterror = sock_error();
}
else
{
writebuff += sent;
writelen -= sent;
}
tls->sft->FreeContextBuffer(sbdout.pBuffers[0].pvBuffer);
sbdout.pBuffers[0].pvBuffer = NULL;
sbdout.pBuffers[0].cbBuffer = 0;
}
/* poll for a bit until the remote server stops sending data, ie it
* finishes sending the token */
inbytes = 0;
inbytes = 1;
{
fd_set fds;
struct timeval tv;
@@ -225,7 +243,7 @@ int tls_start(tls_t *tls)
select(tls->sock, &fds, NULL, NULL, &tv);
}
while (inbytes != -1) {
while (inbytes > 0) {
fd_set fds;
struct timeval tv;
@@ -237,17 +255,22 @@ int tls_start(tls_t *tls)
select(tls->sock, &fds, NULL, NULL, &tv);
inbytes = sock_read(tls->sock, p, spi->cbMaxToken - len);
inbytes = sock_read(tls->sock, p, tls->spi->cbMaxToken - len);
if (inbytes > 0) {
len += inbytes;
p += inbytes;
}
else
{
tls->lasterror = sock_error();
}
}
sbin[0].cbBuffer = len;
ret = sft->InitializeSecurityContextA(&hcred, &(tls->hctxt), name,
ret = tls->sft->InitializeSecurityContextA(&(tls->hcred), &(tls->hctxt), name,
ctxtreq, 0, 0, &sbdin, 0,
&(tls->hctxt), &sbdout,
&ctxtattr, NULL);
@@ -255,9 +278,18 @@ int tls_start(tls_t *tls)
if (ret == SEC_E_OK) {
if (sbdout.pBuffers[0].cbBuffer) {
sent = sock_write(tls->sock, sbdout.pBuffers[0].pvBuffer,
sbdout.pBuffers[0].cbBuffer);
sft->FreeContextBuffer(sbdout.pBuffers[0].pvBuffer);
unsigned char *writebuff = sbdout.pBuffers[0].pvBuffer;
unsigned int writelen = sbdout.pBuffers[0].cbBuffer;
sent = sock_write(tls->sock, writebuff, writelen);
if (sent == -1) {
tls->lasterror = sock_error();
}
else
{
writebuff += sent;
writelen -= sent;
}
tls->sft->FreeContextBuffer(sbdout.pBuffers[0].pvBuffer);
sbdout.pBuffers[0].pvBuffer = NULL;
sbdout.pBuffers[0].cbBuffer = 0;
}
@@ -266,13 +298,11 @@ int tls_start(tls_t *tls)
xmpp_free(tls->ctx, sbin[0].pvBuffer);
if (ret != SEC_E_OK) {
xmpp_debug(tls->ctx, "TLSS",
"Couldn't initialize security context: error %d", ret);
tls->lasterror = ret;
return 0;
}
sft->QueryContextAttributes(&(tls->hctxt), SECPKG_ATTR_STREAM_SIZES,
tls->sft->QueryContextAttributes(&(tls->hctxt), SECPKG_ATTR_STREAM_SIZES,
&(tls->spcss));
tls->recvbuffermaxlen = tls->spcss.cbHeader + tls->spcss.cbMaximumMessage
@@ -387,7 +417,7 @@ int tls_read(tls_t *tls, void * const buff, const size_t len)
memset(&(sbdec[3]), 0, sizeof(sbdec[3]));
sbdec[3].BufferType = SECBUFFER_EMPTY;
ret = sft->DecryptMessage(&(tls->hctxt), &sbddec, 0, NULL);
ret = tls->sft->DecryptMessage(&(tls->hctxt), &sbddec, 0, NULL);
if (ret == SEC_E_OK) {
memcpy(tls->readybuffer, sbdec[1].pvBuffer, sbdec[1].cbBuffer);
@@ -420,6 +450,7 @@ int tls_read(tls_t *tls, void * const buff, const size_t len)
/* something bad happened, so we bail */
tls->lasterror = ret;
return -1;
}
@@ -509,7 +540,7 @@ int tls_write(tls_t *tls, const void * const buff, const size_t len)
tls->sendbufferlen = sbenc[0].cbBuffer + sbenc[1].cbBuffer
+ sbenc[2].cbBuffer;
ret = sft->EncryptMessage(&(tls->hctxt), 0, &sbdenc, 0);
ret = tls->sft->EncryptMessage(&(tls->hctxt), 0, &sbdenc, 0);
if (ret != SEC_E_OK) {
tls->lasterror = ret;