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curl/lib/http_negotiate_sspi.c
Steve Holme d62cb0f5d0 sspi: Define authentication package name constants 
These were previously hard coded, and whilst defined in security.h,
they may or may not be present in old header files given that these
defines were never used in the original code.

Not only that, but there appears to be some ambiguity between the ANSI
and UNICODE NTLM definition name in security.h.
2014-11-05 11:54:02 +00:00

296 lines
8.6 KiB
C
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* 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 http://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"
#ifdef USE_WINDOWS_SSPI
#if !defined(CURL_DISABLE_HTTP) && defined(USE_SPNEGO)
#include "urldata.h"
#include "sendf.h"
#include "rawstr.h"
#include "warnless.h"
#include "curl_base64.h"
#include "curl_sasl.h"
#include "http_negotiate.h"
#include "curl_memory.h"
#include "curl_multibyte.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
/* The last #include file should be: */
#include "memdebug.h"
/* returning zero (0) means success, everything else is treated as "failure"
with no care exactly what the failure was */
int Curl_input_negotiate(struct connectdata *conn, bool proxy,
const char *header)
{
BYTE *input_token = NULL;
SecBufferDesc out_buff_desc;
SecBuffer out_sec_buff;
SecBufferDesc in_buff_desc;
SecBuffer in_sec_buff;
unsigned long context_attributes;
TimeStamp expiry;
int ret;
size_t len = 0, input_token_len = 0;
CURLcode error;
/* Point to the username and password */
const char *userp;
const char *passwdp;
/* Point to the correct struct with this */
struct negotiatedata *neg_ctx;
if(proxy) {
userp = conn->proxyuser;
passwdp = conn->proxypasswd;
neg_ctx = &conn->data->state.proxyneg;
}
else {
userp = conn->user;
passwdp = conn->passwd;
neg_ctx = &conn->data->state.negotiate;
}
/* Not set means empty */
if(!userp)
userp = "";
if(!passwdp)
passwdp = "";
if(neg_ctx->context && neg_ctx->status == SEC_E_OK) {
/* We finished successfully our part of authentication, but server
* rejected it (since we're again here). Exit with an error since we
* can't invent anything better */
Curl_cleanup_negotiate(conn->data);
return -1;
}
if(!neg_ctx->server_name) {
/* Check proxy auth requested but no given proxy name */
if(proxy && !conn->proxy.name)
return -1;
/* Generate our SPN */
neg_ctx->server_name = Curl_sasl_build_spn("HTTP",
proxy ? conn->proxy.name :
conn->host.name);
if(!neg_ctx->server_name)
return -1;
}
if(!neg_ctx->output_token) {
PSecPkgInfo SecurityPackage;
ret = s_pSecFn->QuerySecurityPackageInfo((TCHAR *) TEXT(SP_NAME_NEGOTIATE),
&SecurityPackage);
if(ret != SEC_E_OK)
return -1;
/* Allocate input and output buffers according to the max token size
as indicated by the security package */
neg_ctx->token_max = SecurityPackage->cbMaxToken;
neg_ctx->output_token = malloc(neg_ctx->token_max);
s_pSecFn->FreeContextBuffer(SecurityPackage);
}
/* Obtain the input token, if any */
header += strlen("Negotiate");
while(*header && ISSPACE(*header))
header++;
len = strlen(header);
if(!len) {
/* Is this the first call in a new negotiation? */
if(neg_ctx->context) {
/* The server rejected our authentication and hasn't suppled any more
negotiation mechanisms */
return -1;
}
/* We have to acquire credentials and allocate memory for the context */
neg_ctx->credentials = malloc(sizeof(CredHandle));
neg_ctx->context = malloc(sizeof(CtxtHandle));
if(!neg_ctx->credentials || !neg_ctx->context)
return -1;
if(userp && *userp) {
/* Populate our identity structure */
error = Curl_create_sspi_identity(userp, passwdp, &neg_ctx->identity);
if(error)
return -1;
/* Allow proper cleanup of the identity structure */
neg_ctx->p_identity = &neg_ctx->identity;
}
else
/* Use the current Windows user */
neg_ctx->p_identity = NULL;
/* Acquire our credientials handle */
neg_ctx->status =
s_pSecFn->AcquireCredentialsHandle(NULL,
(TCHAR *) TEXT(SP_NAME_NEGOTIATE),
SECPKG_CRED_OUTBOUND, NULL,
neg_ctx->p_identity, NULL, NULL,
neg_ctx->credentials, &expiry);
if(neg_ctx->status != SEC_E_OK)
return -1;
}
else {
error = Curl_base64_decode(header,
(unsigned char **)&input_token,
&input_token_len);
if(error || !input_token_len)
return -1;
}
/* Setup the "output" security buffer */
out_buff_desc.ulVersion = SECBUFFER_VERSION;
out_buff_desc.cBuffers = 1;
out_buff_desc.pBuffers = &out_sec_buff;
out_sec_buff.BufferType = SECBUFFER_TOKEN;
out_sec_buff.pvBuffer = neg_ctx->output_token;
out_sec_buff.cbBuffer = curlx_uztoul(neg_ctx->token_max);
/* Setup the "input" security buffer if present */
if(input_token) {
in_buff_desc.ulVersion = SECBUFFER_VERSION;
in_buff_desc.cBuffers = 1;
in_buff_desc.pBuffers = &in_sec_buff;
in_sec_buff.BufferType = SECBUFFER_TOKEN;
in_sec_buff.pvBuffer = input_token;
in_sec_buff.cbBuffer = curlx_uztoul(input_token_len);
}
/* Generate our message */
neg_ctx->status = s_pSecFn->InitializeSecurityContext(
neg_ctx->credentials,
input_token ? neg_ctx->context : NULL,
neg_ctx->server_name,
ISC_REQ_CONFIDENTIALITY,
0,
SECURITY_NATIVE_DREP,
input_token ? &in_buff_desc : NULL,
0,
neg_ctx->context,
&out_buff_desc,
&context_attributes,
&expiry);
Curl_safefree(input_token);
if(GSS_ERROR(neg_ctx->status))
return -1;
if(neg_ctx->status == SEC_I_COMPLETE_NEEDED ||
neg_ctx->status == SEC_I_COMPLETE_AND_CONTINUE) {
neg_ctx->status = s_pSecFn->CompleteAuthToken(neg_ctx->context,
&out_buff_desc);
if(GSS_ERROR(neg_ctx->status))
return -1;
}
neg_ctx->output_token_length = out_sec_buff.cbBuffer;
return 0;
}
CURLcode Curl_output_negotiate(struct connectdata *conn, bool proxy)
{
struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
&conn->data->state.negotiate;
char *encoded = NULL;
size_t len = 0;
char *userp;
CURLcode error;
error = Curl_base64_encode(conn->data,
(const char*)neg_ctx->output_token,
neg_ctx->output_token_length,
&encoded, &len);
if(error)
return error;
if(!len)
return CURLE_REMOTE_ACCESS_DENIED;
userp = aprintf("%sAuthorization: Negotiate %s\r\n", proxy ? "Proxy-" : "",
encoded);
if(proxy) {
Curl_safefree(conn->allocptr.proxyuserpwd);
conn->allocptr.proxyuserpwd = userp;
}
else {
Curl_safefree(conn->allocptr.userpwd);
conn->allocptr.userpwd = userp;
}
free(encoded);
return (userp == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK;
}
static void cleanup(struct negotiatedata *neg_ctx)
{
/* Free our security context */
if(neg_ctx->context) {
s_pSecFn->DeleteSecurityContext(neg_ctx->context);
free(neg_ctx->context);
neg_ctx->context = NULL;
}
/* Free our credentials handle */
if(neg_ctx->credentials) {
s_pSecFn->FreeCredentialsHandle(neg_ctx->credentials);
free(neg_ctx->credentials);
neg_ctx->credentials = NULL;
}
/* Free our identity */
Curl_sspi_free_identity(neg_ctx->p_identity);
neg_ctx->p_identity = NULL;
/* Free the SPN and output token */
Curl_safefree(neg_ctx->server_name);
Curl_safefree(neg_ctx->output_token);
/* Reset any variables */
neg_ctx->token_max = 0;
}
void Curl_cleanup_negotiate(struct SessionHandle *data)
{
cleanup(&data->state.negotiate);
cleanup(&data->state.proxyneg);
}
#endif /* !CURL_DISABLE_HTTP && USE_SPNEGO */
#endif /* USE_WINDOWS_SSPI */
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