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secur32: Split the NTLM credential and context handles into separate objects. 

This prevents races with two threads using the helper object at the same
time on two different context handles, eliminates the need to free the
credential handle after freeing the context handles and also prevents a
crash caused by not clearing session_key in DeleteSecurityContext.
This commit is contained in:
Rob Shearman 2007-08-07 17:12:32 +01:00 committed by Alexandre Julliard
parent b8dd5839ef
commit 888a8e27b8
3 changed files with 207 additions and 119 deletions
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1
dlls/secur32/dispatcher.c
View File

@ -111,7 +111,6 @@ SECURITY_STATUS fork_helper(PNegoHelper *new_helper, const char *prog,
{
*new_helper = helper;
helper->major = helper->minor = helper->micro = -1;
helper->password = NULL;
helper->com_buf = NULL;
helper->com_buf_size = 0;
helper->com_buf_offset = 0;

323
dlls/secur32/ntlm.c
View File

@ -40,6 +40,17 @@ WINE_DEFAULT_DEBUG_CHANNEL(ntlm);
static CHAR ntlm_auth[] = "ntlm_auth";
typedef struct _NtlmCredentials
{
HelperMode mode;
/* these are all in the Unix codepage */
char *username_arg;
char *domain_arg;
char *password; /* not nul-terminated */
int pwlen;
} NtlmCredentials, *PNtlmCredentials;
/***********************************************************************
* QueryCredentialsAttributesA
*/
@ -91,46 +102,35 @@ static SECURITY_STATUS SEC_ENTRY ntlm_AcquireCredentialsHandleW(
PVOID pGetKeyArgument, PCredHandle phCredential, PTimeStamp ptsExpiry)
{
SECURITY_STATUS ret;
PNegoHelper helper = NULL;
static CHAR server_helper_protocol[] = "--helper-protocol=squid-2.5-ntlmssp",
credentials_argv[] = "--use-cached-creds";
SEC_CHAR *client_user_arg = NULL;
SEC_CHAR *client_domain_arg = NULL;
PNtlmCredentials ntlm_cred = NULL;
SEC_WCHAR *username = NULL, *domain = NULL;
SEC_CHAR *client_argv[6];
SEC_CHAR *server_argv[] = { ntlm_auth,
server_helper_protocol,
NULL };
TRACE("(%s, %s, 0x%08x, %p, %p, %p, %p, %p, %p)\n",
debugstr_w(pszPrincipal), debugstr_w(pszPackage), fCredentialUse,
pLogonID, pAuthData, pGetKeyFn, pGetKeyArgument, phCredential, ptsExpiry);
switch(fCredentialUse)
{
case SECPKG_CRED_INBOUND:
if( (ret = fork_helper(&helper, ntlm_auth, server_argv)) !=
SEC_E_OK)
{
phCredential = NULL;
break;
}
ntlm_cred = HeapAlloc(GetProcessHeap(), 0, sizeof(*ntlm_cred));
if (!ntlm_cred)
ret = SEC_E_INSUFFICIENT_MEMORY;
else
{
helper->mode = NTLM_SERVER;
ntlm_cred->mode = NTLM_SERVER;
ntlm_cred->username_arg = NULL;
ntlm_cred->domain_arg = NULL;
ntlm_cred->password = NULL;
ntlm_cred->pwlen = 0;
phCredential->dwUpper = fCredentialUse;
phCredential->dwLower = (ULONG_PTR)helper;
phCredential->dwLower = (ULONG_PTR)ntlm_cred;
ret = SEC_E_OK;
}
ret = SEC_E_OK;
break;
case SECPKG_CRED_OUTBOUND:
{
static const char username_arg[] = "--username=";
static const char domain_arg[] = "--domain=";
static char helper_protocol[] = "--helper-protocol=ntlmssp-client-1";
int unixcp_size;
if(pAuthData == NULL)
@ -176,67 +176,60 @@ static SECURITY_STATUS SEC_ENTRY ntlm_AcquireCredentialsHandleW(
auth_data->DomainLength * sizeof(SEC_WCHAR));
domain[auth_data->DomainLength] = '\0';
}
ntlm_cred = HeapAlloc(GetProcessHeap(), 0, sizeof(*ntlm_cred));
if (!ntlm_cred)
{
ret = SEC_E_INSUFFICIENT_MEMORY;
break;
}
ntlm_cred->mode = NTLM_CLIENT;
ntlm_cred->password = NULL;
ntlm_cred->pwlen = 0;
TRACE("Username is %s\n", debugstr_w(username));
unixcp_size = WideCharToMultiByte(CP_UNIXCP, WC_NO_BEST_FIT_CHARS,
username, -1, NULL, 0, NULL, NULL) + sizeof(username_arg);
client_user_arg = HeapAlloc(GetProcessHeap(), 0, unixcp_size);
lstrcpyA(client_user_arg, username_arg);
ntlm_cred->username_arg = HeapAlloc(GetProcessHeap(), 0, unixcp_size);
memcpy(ntlm_cred->username_arg, username_arg, sizeof(username_arg) - 1);
WideCharToMultiByte(CP_UNIXCP, WC_NO_BEST_FIT_CHARS, username, -1,
client_user_arg + sizeof(username_arg) - 1,
ntlm_cred->username_arg + sizeof(username_arg) - 1,
unixcp_size - sizeof(username_arg) + 1, NULL, NULL);
TRACE("Domain name is %s\n", debugstr_w(domain));
unixcp_size = WideCharToMultiByte(CP_UNIXCP, WC_NO_BEST_FIT_CHARS,
domain, -1, NULL, 0, NULL, NULL) + sizeof(domain_arg);
client_domain_arg = HeapAlloc(GetProcessHeap(), 0, unixcp_size);
lstrcpyA(client_domain_arg, domain_arg);
ntlm_cred->domain_arg = HeapAlloc(GetProcessHeap(), 0, unixcp_size);
memcpy(ntlm_cred->domain_arg, domain_arg, sizeof(domain_arg) - 1);
WideCharToMultiByte(CP_UNIXCP, WC_NO_BEST_FIT_CHARS, domain,
-1, client_domain_arg + sizeof(domain_arg) - 1,
-1, ntlm_cred->domain_arg + sizeof(domain_arg) - 1,
unixcp_size - sizeof(domain) + 1, NULL, NULL);
client_argv[0] = ntlm_auth;
client_argv[1] = helper_protocol;
client_argv[2] = client_user_arg;
client_argv[3] = client_domain_arg;
client_argv[4] = credentials_argv;
client_argv[5] = NULL;
if((ret = fork_helper(&helper, ntlm_auth, client_argv)) !=
SEC_E_OK)
if(pAuthData != NULL)
{
phCredential = NULL;
break;
}
else
{
helper->mode = NTLM_CLIENT;
PSEC_WINNT_AUTH_IDENTITY_W auth_data =
(PSEC_WINNT_AUTH_IDENTITY_W)pAuthData;
if(pAuthData != NULL)
if(auth_data->PasswordLength != 0)
{
PSEC_WINNT_AUTH_IDENTITY_W auth_data =
(PSEC_WINNT_AUTH_IDENTITY_W)pAuthData;
ntlm_cred->pwlen = WideCharToMultiByte(CP_UNIXCP,
WC_NO_BEST_FIT_CHARS, auth_data->Password,
auth_data->PasswordLength, NULL, 0, NULL,
NULL);
if(auth_data->PasswordLength != 0)
{
helper->pwlen = WideCharToMultiByte(CP_UNIXCP,
WC_NO_BEST_FIT_CHARS, auth_data->Password,
auth_data->PasswordLength, NULL, 0, NULL,
NULL);
ntlm_cred->password = HeapAlloc(GetProcessHeap(), 0,
ntlm_cred->pwlen);
helper->password = HeapAlloc(GetProcessHeap(), 0,
helper->pwlen);
WideCharToMultiByte(CP_UNIXCP, WC_NO_BEST_FIT_CHARS,
auth_data->Password, auth_data->PasswordLength,
helper->password, helper->pwlen, NULL, NULL);
}
WideCharToMultiByte(CP_UNIXCP, WC_NO_BEST_FIT_CHARS,
auth_data->Password, auth_data->PasswordLength,
ntlm_cred->password, ntlm_cred->pwlen, NULL, NULL);
}
phCredential->dwUpper = fCredentialUse;
phCredential->dwLower = (ULONG_PTR)helper;
TRACE("ACH phCredential->dwUpper: 0x%08lx, dwLower: 0x%08lx\n",
phCredential->dwUpper, phCredential->dwLower);
}
phCredential->dwUpper = fCredentialUse;
phCredential->dwLower = (ULONG_PTR)ntlm_cred;
TRACE("ACH phCredential->dwUpper: 0x%08lx, dwLower: 0x%08lx\n",
phCredential->dwUpper, phCredential->dwLower);
ret = SEC_E_OK;
break;
}
@ -249,10 +242,7 @@ static SECURITY_STATUS SEC_ENTRY ntlm_AcquireCredentialsHandleW(
phCredential = NULL;
ret = SEC_E_UNKNOWN_CREDENTIALS;
}
HeapFree(GetProcessHeap(), 0, client_user_arg);
HeapFree(GetProcessHeap(), 0, client_domain_arg);
HeapFree(GetProcessHeap(), 0, username);
HeapFree(GetProcessHeap(), 0, domain);
@ -400,7 +390,8 @@ static SECURITY_STATUS SEC_ENTRY ntlm_InitializeSecurityContextW(
PSecBufferDesc pOutput, ULONG *pfContextAttr, PTimeStamp ptsExpiry)
{
SECURITY_STATUS ret;
PNegoHelper helper;
PNtlmCredentials ntlm_cred = NULL;
PNegoHelper helper = NULL;
ULONG ctxt_attr = 0;
char* buffer, *want_flags = NULL;
PBYTE bin;
@ -439,6 +430,10 @@ static SECURITY_STATUS SEC_ENTRY ntlm_InitializeSecurityContextW(
if((phContext == NULL) && (pInput == NULL))
{
static char helper_protocol[] = "--helper-protocol=ntlmssp-client-1";
static CHAR credentials_argv[] = "--use-cached-creds";
SEC_CHAR *client_argv[6];
TRACE("First time in ISC()\n");
if(!phCredential)
@ -447,13 +442,55 @@ static SECURITY_STATUS SEC_ENTRY ntlm_InitializeSecurityContextW(
/* As the server side of sspi never calls this, make sure that
* the handler is a client handler.
*/
helper = (PNegoHelper)phCredential->dwLower;
if(helper->mode != NTLM_CLIENT)
ntlm_cred = (PNtlmCredentials)phCredential->dwLower;
if(ntlm_cred->mode != NTLM_CLIENT)
{
TRACE("Helper mode = %d\n", helper->mode);
TRACE("Cred mode = %d\n", ntlm_cred->mode);
return SEC_E_INVALID_HANDLE;
}
client_argv[0] = ntlm_auth;
client_argv[1] = helper_protocol;
client_argv[2] = ntlm_cred->username_arg;
client_argv[3] = ntlm_cred->domain_arg;
client_argv[4] = credentials_argv;
client_argv[5] = NULL;
if((ret = fork_helper(&helper, ntlm_auth, client_argv)) != SEC_E_OK)
goto isc_end;
helper->mode = NTLM_CLIENT;
helper->session_key = HeapAlloc(GetProcessHeap(), 0, 16);
if (!helper->session_key)
{
cleanup_helper(helper);
ret = SEC_E_INSUFFICIENT_MEMORY;
goto isc_end;
}
/* Generate the dummy session key = MD4(MD4(password))*/
if(ntlm_cred->password)
{
SEC_WCHAR *unicode_password;
int passwd_lenW;
TRACE("Converting password to unicode.\n");
passwd_lenW = MultiByteToWideChar(CP_ACP, 0,
(LPCSTR)ntlm_cred->password, ntlm_cred->pwlen,
NULL, 0);
unicode_password = HeapAlloc(GetProcessHeap(), 0,
passwd_lenW * sizeof(SEC_WCHAR));
MultiByteToWideChar(CP_ACP, 0, (LPCSTR)ntlm_cred->password,
ntlm_cred->pwlen, unicode_password, passwd_lenW);
SECUR32_CreateNTLMv1SessionKey((PBYTE)unicode_password,
passwd_lenW * sizeof(SEC_WCHAR), helper->session_key);
HeapFree(GetProcessHeap(), 0, unicode_password);
}
else
memset(helper->session_key, 0, 16);
/* Allocate space for a maximal string of
* "SF NTLMSSP_FEATURE_SIGN NTLMSSP_FEATURE_SEAL
* NTLMSSP_FEATURE_SESSION_KEY"
@ -461,6 +498,7 @@ static SECURITY_STATUS SEC_ENTRY ntlm_InitializeSecurityContextW(
want_flags = HeapAlloc(GetProcessHeap(), 0, 73);
if(want_flags == NULL)
{
cleanup_helper(helper);
ret = SEC_E_INSUFFICIENT_MEMORY;
goto isc_end;
}
@ -504,11 +542,14 @@ static SECURITY_STATUS SEC_ENTRY ntlm_InitializeSecurityContextW(
/* If no password is given, try to use cached credentials. Fall back to an empty
* password if this failed. */
if(helper->password == NULL)
if(ntlm_cred->password == NULL)
{
lstrcpynA(buffer, "OK", max_len-1);
if((ret = run_helper(helper, buffer, max_len, &buffer_len)) != SEC_E_OK)
{
cleanup_helper(helper);
goto isc_end;
}
/* If the helper replied with "PW", using cached credentials failed */
if(!strncmp(buffer, "PW", 2))
{
@ -521,16 +562,22 @@ static SECURITY_STATUS SEC_ENTRY ntlm_InitializeSecurityContextW(
else
{
lstrcpynA(buffer, "PW ", max_len-1);
if((ret = encodeBase64((unsigned char*)helper->password,
helper->pwlen, buffer+3,
if((ret = encodeBase64((unsigned char*)ntlm_cred->password,
ntlm_cred->pwlen, buffer+3,
max_len-3, &buffer_len)) != SEC_E_OK)
{
cleanup_helper(helper);
goto isc_end;
}
}
TRACE("Sending to helper: %s\n", debugstr_a(buffer));
if((ret = run_helper(helper, buffer, max_len, &buffer_len)) != SEC_E_OK)
{
cleanup_helper(helper);
goto isc_end;
}
TRACE("Helper returned %s\n", debugstr_a(buffer));
@ -548,7 +595,10 @@ static SECURITY_STATUS SEC_ENTRY ntlm_InitializeSecurityContextW(
lstrcpynA(buffer, "YR", max_len-1);
if((ret = run_helper(helper, buffer, max_len, &buffer_len)) != SEC_E_OK)
{
cleanup_helper(helper);
goto isc_end;
}
TRACE("%s\n", buffer);
@ -557,11 +607,15 @@ static SECURITY_STATUS SEC_ENTRY ntlm_InitializeSecurityContextW(
/* Something borked */
TRACE("Helper returned %c%c\n", buffer[0], buffer[1]);
ret = SEC_E_INTERNAL_ERROR;
cleanup_helper(helper);
goto isc_end;
}
if((ret = decodeBase64(buffer+3, buffer_len-3, bin,
max_len-1, &bin_len)) != SEC_E_OK)
{
cleanup_helper(helper);
goto isc_end;
}
/* put the decoded client blob into the out buffer */
@ -655,6 +709,12 @@ static SECURITY_STATUS SEC_ENTRY ntlm_InitializeSecurityContextW(
{
TRACE("no SECBUFFER_TOKEN buffer could be found\n");
ret = SEC_E_BUFFER_TOO_SMALL;
if ((phContext == NULL) && (pInput == NULL))
{
cleanup_helper(helper);
phNewContext->dwUpper = 0;
phNewContext->dwLower = 0;
}
goto isc_end;
}
@ -667,6 +727,12 @@ static SECURITY_STATUS SEC_ENTRY ntlm_InitializeSecurityContextW(
{
TRACE("out buffer is NULL or has not enough space\n");
ret = SEC_E_BUFFER_TOO_SMALL;
if ((phContext == NULL) && (pInput == NULL))
{
cleanup_helper(helper);
phNewContext->dwUpper = 0;
phNewContext->dwLower = 0;
}
goto isc_end;
}
@ -674,6 +740,12 @@ static SECURITY_STATUS SEC_ENTRY ntlm_InitializeSecurityContextW(
{
TRACE("out buffer is NULL\n");
ret = SEC_E_INTERNAL_ERROR;
if ((phContext == NULL) && (pInput == NULL))
{
cleanup_helper(helper);
phNewContext->dwUpper = 0;
phNewContext->dwLower = 0;
}
goto isc_end;
}
@ -705,33 +777,7 @@ static SECURITY_STATUS SEC_ENTRY ntlm_InitializeSecurityContextW(
goto isc_end;
if(strncmp(buffer, "BH", 2) == 0)
{
TRACE("No key negotiated.\n");
helper->valid_session_key = FALSE;
helper->session_key = HeapAlloc(GetProcessHeap(), 0, 16);
/*Generate the dummy session key = MD4(MD4(password))*/
if(helper->password)
{
SEC_WCHAR *unicode_password;
int passwd_lenW;
TRACE("Converting password to unicode.\n");
passwd_lenW = MultiByteToWideChar(CP_ACP, 0,
(LPCSTR)helper->password, helper->pwlen,
NULL, 0);
unicode_password = HeapAlloc(GetProcessHeap(), 0,
passwd_lenW * sizeof(SEC_WCHAR));
MultiByteToWideChar(CP_ACP, 0, (LPCSTR)helper->password,
helper->pwlen, unicode_password, passwd_lenW);
SECUR32_CreateNTLMv1SessionKey((PBYTE)unicode_password,
passwd_lenW * sizeof(SEC_WCHAR), helper->session_key);
HeapFree(GetProcessHeap(), 0, unicode_password);
}
else
memset(helper->session_key, 0, 16);
}
else if(strncmp(buffer, "GK ", 3) == 0)
{
if((ret = decodeBase64(buffer+3, buffer_len-3, bin, max_len,
@ -741,6 +787,7 @@ static SECURITY_STATUS SEC_ENTRY ntlm_InitializeSecurityContextW(
}
TRACE("Session key is %s\n", debugstr_a(buffer+3));
helper->valid_session_key = TRUE;
HeapFree(GetProcessHeap(), 0, helper->session_key);
helper->session_key = HeapAlloc(GetProcessHeap(), 0, bin_len);
if(!helper->session_key)
{
@ -820,31 +867,40 @@ static SECURITY_STATUS SEC_ENTRY ntlm_AcceptSecurityContext(
int buffer_len, bin_len, max_len = NTLM_MAX_BUF;
ULONG ctxt_attr = 0;
PNegoHelper helper;
PNtlmCredentials ntlm_cred;
TRACE("%p %p %p %d %d %p %p %p %p\n", phCredential, phContext, pInput,
fContextReq, TargetDataRep, phNewContext, pOutput, pfContextAttr,
ptsExpiry);
if (!phCredential)
return SEC_E_INVALID_HANDLE;
helper = (PNegoHelper)phCredential->dwLower;
buffer = HeapAlloc(GetProcessHeap(), 0, sizeof(char) * NTLM_MAX_BUF);
bin = HeapAlloc(GetProcessHeap(),0, sizeof(BYTE) * NTLM_MAX_BUF);
if(helper->mode != NTLM_SERVER)
{
ret = SEC_E_INVALID_HANDLE;
goto asc_end;
}
if(TargetDataRep == SECURITY_NETWORK_DREP){
TRACE("Using SECURITY_NETWORK_DREP\n");
}
if(phContext == NULL)
{
static CHAR server_helper_protocol[] = "--helper-protocol=squid-2.5-ntlmssp";
SEC_CHAR *server_argv[] = { ntlm_auth,
server_helper_protocol,
NULL };
if (!phCredential)
{
ret = SEC_E_INVALID_HANDLE;
goto asc_end;
}
ntlm_cred = (PNtlmCredentials)phCredential->dwLower;
if(ntlm_cred->mode != NTLM_SERVER)
{
ret = SEC_E_INVALID_HANDLE;
goto asc_end;
}
/* This is the first call to AcceptSecurityHandle */
if(pInput == NULL)
{
@ -866,12 +922,21 @@ static SECURITY_STATUS SEC_ENTRY ntlm_AcceptSecurityContext(
else
bin_len = pInput->pBuffers[0].cbBuffer;
if( (ret = fork_helper(&helper, ntlm_auth, server_argv)) !=
SEC_E_OK)
{
ret = SEC_E_INTERNAL_ERROR;
goto asc_end;
}
helper->mode = NTLM_SERVER;
/* Handle all the flags */
want_flags = HeapAlloc(GetProcessHeap(), 0, 73);
if(want_flags == NULL)
{
TRACE("Failed to allocate memory for the want_flags!\n");
ret = SEC_E_INSUFFICIENT_MEMORY;
cleanup_helper(helper);
goto asc_end;
}
lstrcpyA(want_flags, "SF");
@ -921,7 +986,10 @@ static SECURITY_STATUS SEC_ENTRY ntlm_AcceptSecurityContext(
lstrcpynA(buffer, want_flags, max_len - 1);
if((ret = run_helper(helper, buffer, max_len, &buffer_len)) !=
SEC_E_OK)
{
cleanup_helper(helper);
goto asc_end;
}
if(!strncmp(buffer, "BH", 2))
TRACE("Helper doesn't understand new command set\n");
}
@ -935,6 +1003,7 @@ static SECURITY_STATUS SEC_ENTRY ntlm_AcceptSecurityContext(
if((ret = encodeBase64(bin, bin_len, buffer+3, max_len-3,
&buffer_len)) != SEC_E_OK)
{
cleanup_helper(helper);
goto asc_end;
}
@ -943,6 +1012,7 @@ static SECURITY_STATUS SEC_ENTRY ntlm_AcceptSecurityContext(
if((ret = run_helper(helper, buffer, max_len, &buffer_len)) !=
SEC_E_OK)
{
cleanup_helper(helper);
goto asc_end;
}
@ -952,12 +1022,14 @@ static SECURITY_STATUS SEC_ENTRY ntlm_AcceptSecurityContext(
if(strncmp(buffer, "TT ", 3) != 0)
{
ret = SEC_E_INTERNAL_ERROR;
cleanup_helper(helper);
goto asc_end;
}
if((ret = decodeBase64(buffer+3, buffer_len-3, bin, max_len,
&bin_len)) != SEC_E_OK)
{
cleanup_helper(helper);
goto asc_end;
}
@ -965,12 +1037,14 @@ static SECURITY_STATUS SEC_ENTRY ntlm_AcceptSecurityContext(
if(pOutput == NULL)
{
ret = SEC_E_INSUFFICIENT_MEMORY;
cleanup_helper(helper);
goto asc_end;
}
if(pOutput->cBuffers < 1)
{
ret = SEC_E_INSUFFICIENT_MEMORY;
cleanup_helper(helper);
goto asc_end;
}
@ -995,6 +1069,20 @@ static SECURITY_STATUS SEC_ENTRY ntlm_AcceptSecurityContext(
goto asc_end;
}
if(!phContext)
{
ret = SEC_E_INVALID_HANDLE;
goto asc_end;
}
helper = (PNegoHelper)phContext->dwLower;
if(helper->mode != NTLM_SERVER)
{
ret = SEC_E_INVALID_HANDLE;
goto asc_end;
}
if(pInput->pBuffers[0].cbBuffer > max_len)
{
ret = SEC_E_INVALID_TOKEN;
@ -1146,6 +1234,8 @@ static SECURITY_STATUS SEC_ENTRY ntlm_DeleteSecurityContext(PCtxtHandle phContex
HeapFree(GetProcessHeap(), 0, helper->crypt.ntlm2.recv_sign_key);
HeapFree(GetProcessHeap(), 0, helper->crypt.ntlm2.recv_seal_key);
cleanup_helper(helper);
return SEC_E_OK;
}
@ -1500,13 +1590,14 @@ static SECURITY_STATUS SEC_ENTRY ntlm_FreeCredentialsHandle(
SECURITY_STATUS ret;
if(phCredential){
PNegoHelper helper = (PNegoHelper) phCredential->dwLower;
PNtlmCredentials ntlm_cred = (PNtlmCredentials) phCredential->dwLower;
phCredential->dwUpper = 0;
phCredential->dwLower = 0;
if (helper->password)
memset(helper->password, 0, helper->pwlen);
HeapFree(GetProcessHeap(), 0, helper->password);
cleanup_helper(helper);
if (ntlm_cred->password)
memset(ntlm_cred->password, 0, ntlm_cred->pwlen);
HeapFree(GetProcessHeap(), 0, ntlm_cred->password);
HeapFree(GetProcessHeap(), 0, ntlm_cred->username_arg);
HeapFree(GetProcessHeap(), 0, ntlm_cred->domain_arg);
ret = SEC_E_OK;
}
else

2
dlls/secur32/secur32_priv.h
View File

@ -61,8 +61,6 @@ typedef struct tag_arc4_info {
typedef struct _NegoHelper {
pid_t helper_pid;
HelperMode mode;
SEC_CHAR *password;
int pwlen;
int pipe_in;
int pipe_out;
int major;