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curl/lib/http_negotiate_sspi.c

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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2015, 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 https://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_multibyte.h"
#include "curl_printf.h"
/* The last #include files should be: */
#include "curl_memory.h"
#include "memdebug.h"
CURLcode Curl_input_negotiate(struct connectdata *conn, bool proxy,
const char *header)
{
struct SessionHandle *data = conn->data;
BYTE *input_token = NULL;
SecBufferDesc out_buff_desc;
SecBuffer out_sec_buff;
SecBufferDesc in_buff_desc;
SecBuffer in_sec_buff;
SECURITY_STATUS status;
unsigned long attrs;
TimeStamp expiry; /* For Windows 9x compatibility of SSPI calls */
size_t len = 0, input_token_len = 0;
CURLcode result;
/* 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 = &data->state.proxyneg;
}
else {
userp = conn->user;
passwdp = conn->passwd;
neg_ctx = &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(data);
return CURLE_LOGIN_DENIED;
}
if(!neg_ctx->server_name) {
/* Check proxy auth requested but no given proxy name */
if(proxy && !conn->proxy.name)
return CURLE_BAD_FUNCTION_ARGUMENT;
/* Generate our SPN */
neg_ctx->server_name = Curl_sasl_build_spn(
proxy ? data->set.str[STRING_PROXY_SERVICE_NAME] :
data->set.str[STRING_SERVICE_NAME],
proxy ? conn->proxy.name : conn->host.name);
if(!neg_ctx->server_name)
return CURLE_OUT_OF_MEMORY;
}
if(!neg_ctx->output_token) {
PSecPkgInfo SecurityPackage;
status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *)
TEXT(SP_NAME_NEGOTIATE),
&SecurityPackage);
if(status != SEC_E_OK)
return CURLE_NOT_BUILT_IN;
/* 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 CURLE_LOGIN_DENIED;
}
/* 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 CURLE_OUT_OF_MEMORY;
if(userp && *userp) {
/* Populate our identity structure */
result = Curl_create_sspi_identity(userp, passwdp, &neg_ctx->identity);
if(result)
return result;
/* 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 CURLE_LOGIN_DENIED;
}
else {
result = Curl_base64_decode(header,
(unsigned char **)&input_token,
&input_token_len);
if(result)
return result;
if(!input_token_len) {
infof(data,
"Negotiate handshake failure (empty challenge message)\n");
return CURLE_BAD_CONTENT_ENCODING;
}
}
/* 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,
&attrs,
&expiry);
free(input_token);
if(GSS_ERROR(neg_ctx->status))
return CURLE_OUT_OF_MEMORY;
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 CURLE_RECV_ERROR;
}
neg_ctx->output_token_length = out_sec_buff.cbBuffer;
return CURLE_OK;
}
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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