b91e97eabd
Following the recent changes and in attempt to align the SSPI based authentication code performed the following: * Use NULL and SECBUFFVERSION rather than hard coded constants. * Avoid comparison of zero in if statements. * Standardised the buf and desc setup code.
309 lines
8.9 KiB
C
309 lines
8.9 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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#include "curl_setup.h"
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#ifdef USE_WINDOWS_SSPI
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#if !defined(CURL_DISABLE_HTTP) && defined(USE_SPNEGO)
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#include "urldata.h"
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#include "sendf.h"
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#include "rawstr.h"
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#include "warnless.h"
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#include "curl_base64.h"
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#include "http_negotiate.h"
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#include "curl_memory.h"
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#include "curl_multibyte.h"
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#define _MPRINTF_REPLACE /* use our functions only */
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#include <curl/mprintf.h>
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/* The last #include file should be: */
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#include "memdebug.h"
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static int
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get_gss_name(struct connectdata *conn, bool proxy,
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struct negotiatedata *neg_ctx)
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{
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const char* service = "HTTP";
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size_t length;
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if(proxy && !conn->proxy.name)
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/* proxy auth requested but no given proxy name, error out! */
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return -1;
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length = strlen(service) + 1 + strlen(proxy ? conn->proxy.name :
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conn->host.name) + 1;
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if(length + 1 > sizeof(neg_ctx->server_name))
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return EMSGSIZE;
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snprintf(neg_ctx->server_name, sizeof(neg_ctx->server_name), "%s/%s",
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service, proxy ? conn->proxy.name : conn->host.name);
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return 0;
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}
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/* returning zero (0) means success, everything else is treated as "failure"
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with no care exactly what the failure was */
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int Curl_input_negotiate(struct connectdata *conn, bool proxy,
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const char *header)
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{
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BYTE *input_token = NULL;
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SecBufferDesc out_buff_desc;
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SecBuffer out_sec_buff;
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SecBufferDesc in_buff_desc;
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SecBuffer in_sec_buff;
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unsigned long context_attributes;
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TimeStamp lifetime;
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TCHAR *sname;
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int ret;
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size_t len = 0, input_token_len = 0;
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CURLcode error;
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/* Point to the username and password */
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const char *userp;
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const char *passwdp;
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/* Point to the correct struct with this */
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struct negotiatedata *neg_ctx;
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if(proxy) {
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userp = conn->proxyuser;
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passwdp = conn->proxypasswd;
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neg_ctx = &conn->data->state.proxyneg;
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}
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else {
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userp = conn->user;
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passwdp = conn->passwd;
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neg_ctx = &conn->data->state.negotiate;
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}
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/* Not set means empty */
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if(!userp)
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userp = "";
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if(!passwdp)
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passwdp = "";
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if(neg_ctx->context && neg_ctx->status == SEC_E_OK) {
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/* We finished successfully our part of authentication, but server
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* rejected it (since we're again here). Exit with an error since we
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* can't invent anything better */
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Curl_cleanup_negotiate(conn->data);
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return -1;
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}
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if(!strlen(neg_ctx->server_name)) {
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ret = get_gss_name(conn, proxy, neg_ctx);
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if(ret)
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return ret;
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}
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if(!neg_ctx->output_token) {
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PSecPkgInfo SecurityPackage;
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ret = s_pSecFn->QuerySecurityPackageInfo((TCHAR *) TEXT("Negotiate"),
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&SecurityPackage);
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if(ret != SEC_E_OK)
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return -1;
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/* Allocate input and output buffers according to the max token size
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as indicated by the security package */
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neg_ctx->max_token_length = SecurityPackage->cbMaxToken;
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neg_ctx->output_token = malloc(neg_ctx->max_token_length);
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s_pSecFn->FreeContextBuffer(SecurityPackage);
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}
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/* Obtain the input token, if any */
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header += strlen("Negotiate");
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while(*header && ISSPACE(*header))
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header++;
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len = strlen(header);
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if(!len) {
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/* Is this the first call in a new negotiation? */
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if(neg_ctx->context) {
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/* The server rejected our authentication and hasn't suppled any more
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negotiation mechanisms */
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return -1;
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}
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/* We have to acquire credentials and allocate memory for the context */
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neg_ctx->credentials = malloc(sizeof(CredHandle));
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neg_ctx->context = malloc(sizeof(CtxtHandle));
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if(!neg_ctx->credentials || !neg_ctx->context)
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return -1;
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if(userp && *userp) {
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/* Populate our identity structure */
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error = Curl_create_sspi_identity(userp, passwdp, &neg_ctx->identity);
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if(error)
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return -1;
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/* Allow proper cleanup of the identity structure */
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neg_ctx->p_identity = &neg_ctx->identity;
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}
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else
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/* Use the current Windows user */
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neg_ctx->p_identity = NULL;
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/* Acquire our credientials handle */
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neg_ctx->status =
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s_pSecFn->AcquireCredentialsHandle(NULL,
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(TCHAR *) TEXT("Negotiate"),
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SECPKG_CRED_OUTBOUND, NULL,
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neg_ctx->p_identity, NULL, NULL,
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neg_ctx->credentials, &lifetime);
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if(neg_ctx->status != SEC_E_OK)
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return -1;
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}
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else {
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error = Curl_base64_decode(header,
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(unsigned char **)&input_token,
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&input_token_len);
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if(error || !input_token_len)
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return -1;
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}
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/* Setup the "output" security buffer */
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out_buff_desc.ulVersion = SECBUFFER_VERSION;
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out_buff_desc.cBuffers = 1;
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out_buff_desc.pBuffers = &out_sec_buff;
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out_sec_buff.BufferType = SECBUFFER_TOKEN;
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out_sec_buff.pvBuffer = neg_ctx->output_token;
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out_sec_buff.cbBuffer = curlx_uztoul(neg_ctx->max_token_length);
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/* Setup the "input" security buffer if present */
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if(input_token) {
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in_buff_desc.ulVersion = SECBUFFER_VERSION;
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in_buff_desc.cBuffers = 1;
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in_buff_desc.pBuffers = &in_sec_buff;
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in_sec_buff.BufferType = SECBUFFER_TOKEN;
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in_sec_buff.pvBuffer = input_token;
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in_sec_buff.cbBuffer = curlx_uztoul(input_token_len);
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}
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sname = Curl_convert_UTF8_to_tchar(neg_ctx->server_name);
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if(!sname)
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return CURLE_OUT_OF_MEMORY;
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/* Generate our message */
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neg_ctx->status = s_pSecFn->InitializeSecurityContext(
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neg_ctx->credentials,
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input_token ? neg_ctx->context : NULL,
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sname,
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ISC_REQ_CONFIDENTIALITY,
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0,
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SECURITY_NATIVE_DREP,
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input_token ? &in_buff_desc : NULL,
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0,
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neg_ctx->context,
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&out_buff_desc,
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&context_attributes,
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&lifetime);
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Curl_unicodefree(sname);
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Curl_safefree(input_token);
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if(GSS_ERROR(neg_ctx->status))
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return -1;
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if(neg_ctx->status == SEC_I_COMPLETE_NEEDED ||
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neg_ctx->status == SEC_I_COMPLETE_AND_CONTINUE) {
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neg_ctx->status = s_pSecFn->CompleteAuthToken(neg_ctx->context,
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&out_buff_desc);
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if(GSS_ERROR(neg_ctx->status))
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return -1;
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}
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neg_ctx->output_token_length = out_sec_buff.cbBuffer;
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return 0;
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}
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CURLcode Curl_output_negotiate(struct connectdata *conn, bool proxy)
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{
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struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
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&conn->data->state.negotiate;
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char *encoded = NULL;
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size_t len = 0;
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char *userp;
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CURLcode error;
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error = Curl_base64_encode(conn->data,
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(const char*)neg_ctx->output_token,
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neg_ctx->output_token_length,
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&encoded, &len);
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if(error)
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return error;
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if(!len)
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return CURLE_REMOTE_ACCESS_DENIED;
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userp = aprintf("%sAuthorization: Negotiate %s\r\n", proxy ? "Proxy-" : "",
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encoded);
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if(proxy) {
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Curl_safefree(conn->allocptr.proxyuserpwd);
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conn->allocptr.proxyuserpwd = userp;
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}
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else {
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Curl_safefree(conn->allocptr.userpwd);
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conn->allocptr.userpwd = userp;
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}
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free(encoded);
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return (userp == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK;
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}
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static void cleanup(struct negotiatedata *neg_ctx)
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{
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if(neg_ctx->context) {
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s_pSecFn->DeleteSecurityContext(neg_ctx->context);
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free(neg_ctx->context);
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neg_ctx->context = NULL;
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}
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if(neg_ctx->credentials) {
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s_pSecFn->FreeCredentialsHandle(neg_ctx->credentials);
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free(neg_ctx->credentials);
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neg_ctx->credentials = NULL;
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}
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neg_ctx->max_token_length = 0;
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Curl_safefree(neg_ctx->output_token);
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Curl_sspi_free_identity(neg_ctx->p_identity);
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neg_ctx->p_identity = NULL;
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}
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void Curl_cleanup_negotiate(struct SessionHandle *data)
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{
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cleanup(&data->state.negotiate);
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cleanup(&data->state.proxyneg);
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}
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#endif /* !CURL_DISABLE_HTTP && USE_SPNEGO */
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#endif /* USE_WINDOWS_SSPI */
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