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d5b5f64bce
curl/lib/http_negotiate_sspi.c
Yang Tse fd00b382b2 base64: fix Curl_base64_encode and Curl_base64_decode interfaces 
Previous interfaces for these libcurl internal functions did not allow to tell
apart a legitimate zero size result from an error condition. These functions
now return a CURLcode indicating function success or otherwise specific error.
Output size is returned using a pointer argument.

All usage of these two functions, and others closely related, has been adapted
to the new interfaces. Relative error and OOM handling adapted or added where
missing. Unit test 1302 also adapted.
2011-08-24 08:10:30 +02:00

300 lines
8.4 KiB
C
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2011, 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 = &out_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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