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63e2718f8d
curl/lib/http_negotiate_sspi.c
Daniel Stenberg 7f472618de Curl_input_negotiate: use the correct buffer for input 
Unfortunately we have no test cases for this and I have no SSPI build or
server to verify this with. The change seems simple enough though.

Bug: http://curl.haxx.se/bug/view.cgi?id=3466497
Reported by: Patrice Guerin
2012-01-01 22:36:32 +01:00

300 lines
8.4 KiB
C
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2012, 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 "setup.h"
#ifdef USE_WINDOWS_SSPI
#ifndef CURL_DISABLE_HTTP
#include "urldata.h"
#include "sendf.h"
#include "rawstr.h"
#include "curl_base64.h"
#include "http_negotiate.h"
#include "curl_memory.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
/* The last #include file should be: */
#include "memdebug.h"
static int
get_gss_name(struct connectdata *conn, bool proxy,
struct negotiatedata *neg_ctx)
{
const char* service;
size_t length;
if(proxy && !conn->proxy.name)
/* proxy auth requested but no given proxy name, error out! */
return -1;
/* GSSAPI implementation by Globus (known as GSI) requires the name to be
of form "<service>/<fqdn>" instead of <service>@<fqdn> (ie. slash instead
of at-sign). Also GSI servers are often identified as 'host' not 'khttp'.
Change following lines if you want to use GSI */
/* IIS uses the <service>@<fqdn> form but uses 'http' as the service name,
and SSPI then generates an NTLM token. When using <service>/<fqdn> a
Kerberos token is generated. */
if(neg_ctx->gss)
service = "KHTTP";
else
service = "HTTP";
length = strlen(service) + 1 + strlen(proxy ? conn->proxy.name :
conn->host.name) + 1;
if(length + 1 > sizeof(neg_ctx->server_name))
return EMSGSIZE;
snprintf(neg_ctx->server_name, sizeof(neg_ctx->server_name), "%s/%s",
service, proxy ? conn->proxy.name : conn->host.name);
return 0;
}
/* 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)
{
struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
&conn->data->state.negotiate;
BYTE *input_token = 0;
SecBufferDesc out_buff_desc;
SecBuffer out_sec_buff;
SecBufferDesc in_buff_desc;
SecBuffer in_sec_buff;
ULONG context_attributes;
TimeStamp lifetime;
int ret;
size_t len = 0, input_token_len = 0;
bool gss = FALSE;
const char* protocol;
CURLcode error;
while(*header && ISSPACE(*header))
header++;
if(checkprefix("GSS-Negotiate", header)) {
protocol = "GSS-Negotiate";
gss = TRUE;
}
else if(checkprefix("Negotiate", header)) {
protocol = "Negotiate";
gss = FALSE;
}
else
return -1;
if(neg_ctx->context) {
if(neg_ctx->gss != gss) {
return -1;
}
}
else {
neg_ctx->protocol = protocol;
neg_ctx->gss = gss;
}
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(0 == strlen(neg_ctx->server_name)) {
ret = get_gss_name(conn, proxy, neg_ctx);
if(ret)
return ret;
}
if(!neg_ctx->output_token) {
PSecPkgInfo SecurityPackage;
ret = s_pSecFn->QuerySecurityPackageInfo((SEC_CHAR *)"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->max_token_length = SecurityPackage->cbMaxToken;
neg_ctx->output_token = malloc(neg_ctx->max_token_length);
s_pSecFn->FreeContextBuffer(SecurityPackage);
}
/* Obtain the input token, if any */
header += strlen(neg_ctx->protocol);
while(*header && ISSPACE(*header))
header++;
len = strlen(header);
if(!len) {
/* first call in a new negotation, 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;
neg_ctx->status =
s_pSecFn->AcquireCredentialsHandle(NULL, (SEC_CHAR *)"Negotiate",
SECPKG_CRED_OUTBOUND, NULL, NULL,
NULL, NULL, neg_ctx->credentials,
&lifetime);
if(neg_ctx->status != SEC_E_OK)
return -1;
}
else {
input_token = malloc(neg_ctx->max_token_length);
if(!input_token)
return -1;
error = Curl_base64_decode(header,
(unsigned char **)&input_token,
&input_token_len);
if(error || input_token_len == 0)
return -1;
}
/* prepare the output buffers, and input buffers if present */
out_buff_desc.ulVersion = 0;
out_buff_desc.cBuffers = 1;
out_buff_desc.pBuffers = &out_sec_buff;
out_sec_buff.cbBuffer = neg_ctx->max_token_length;
out_sec_buff.BufferType = SECBUFFER_TOKEN;
out_sec_buff.pvBuffer = neg_ctx->output_token;
if(input_token) {
in_buff_desc.ulVersion = 0;
in_buff_desc.cBuffers = 1;
in_buff_desc.pBuffers = &in_sec_buff;
in_sec_buff.cbBuffer = input_token_len;
in_sec_buff.BufferType = SECBUFFER_TOKEN;
in_sec_buff.pvBuffer = input_token;
}
neg_ctx->status = s_pSecFn->InitializeSecurityContext(
neg_ctx->credentials,
input_token ? neg_ctx->context : 0,
neg_ctx->server_name,
ISC_REQ_CONFIDENTIALITY,
0,
SECURITY_NATIVE_DREP,
input_token ? &in_buff_desc : 0,
0,
neg_ctx->context,
&out_buff_desc,
&context_attributes,
&lifetime);
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 == 0)
return CURLE_REMOTE_ACCESS_DENIED;
userp = aprintf("%sAuthorization: %s %s\r\n", proxy ? "Proxy-" : "",
neg_ctx->protocol, encoded);
if(proxy)
conn->allocptr.proxyuserpwd = userp;
else
conn->allocptr.userpwd = userp;
free(encoded);
Curl_cleanup_negotiate (conn->data);
return (userp == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK;
}
static void cleanup(struct negotiatedata *neg_ctx)
{
if(neg_ctx->context) {
s_pSecFn->DeleteSecurityContext(neg_ctx->context);
free(neg_ctx->context);
neg_ctx->context = 0;
}
if(neg_ctx->credentials) {
s_pSecFn->FreeCredentialsHandle(neg_ctx->credentials);
free(neg_ctx->credentials);
neg_ctx->credentials = 0;
}
if(neg_ctx->output_token) {
free(neg_ctx->output_token);
neg_ctx->output_token = 0;
}
neg_ctx->max_token_length = 0;
}
void Curl_cleanup_negotiate(struct SessionHandle *data)
{
cleanup(&data->state.negotiate);
cleanup(&data->state.proxyneg);
}
#endif
#endif
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