332 lines
10 KiB
C
332 lines
10 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 - 2004, 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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* $Id$
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***************************************************************************/
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#include "setup.h"
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#ifdef HAVE_GSSAPI
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#ifdef HAVE_GSSMIT
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#define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
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#endif
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#ifndef CURL_DISABLE_HTTP
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/* -- WIN32 approved -- */
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#include <stdio.h>
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#include <string.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <errno.h>
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#include "urldata.h"
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#include "sendf.h"
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#include "strequal.h"
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#include "base64.h"
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#include "http_negotiate.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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#ifdef CURLDEBUG
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#include "memdebug.h"
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#endif
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static int
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get_gss_name(struct connectdata *conn, gss_name_t *server)
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{
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struct negotiatedata *neg_ctx = &conn->data->state.negotiate;
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OM_uint32 major_status, minor_status;
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gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
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char name[2048];
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const char* service;
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/* GSSAPI implementation by Globus (known as GSI) requires the name to be
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of form "<service>/<fqdn>" instead of <service>@<fqdn> (ie. slash instead
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of at-sign). Also GSI servers are often identified as 'host' not 'khttp'.
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Change following lines if you want to use GSI */
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/* IIS uses the <service>@<fqdn> form but uses 'http' as the service name */
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if (neg_ctx->gss)
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service = "khttp";
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else
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service = "http";
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token.length = strlen(service) + 1 + strlen(conn->hostname) + 1;
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if (token.length + 1 > sizeof(name))
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return EMSGSIZE;
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sprintf(name, "%s@%s", service, conn->hostname);
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token.value = (void *) name;
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major_status = gss_import_name(&minor_status,
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&token,
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GSS_C_NT_HOSTBASED_SERVICE,
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server);
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return GSS_ERROR(major_status) ? -1 : 0;
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}
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static void
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log_gss_error(struct connectdata *conn, OM_uint32 error_status, char *prefix)
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{
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OM_uint32 maj_stat, min_stat;
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OM_uint32 msg_ctx = 0;
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gss_buffer_desc status_string;
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char buf[1024];
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size_t len;
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snprintf(buf, sizeof(buf), "%s", prefix);
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len = strlen(buf);
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do {
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maj_stat = gss_display_status (&min_stat,
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error_status,
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GSS_C_MECH_CODE,
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GSS_C_NO_OID,
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&msg_ctx,
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&status_string);
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if (sizeof(buf) > len + status_string.length + 1) {
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sprintf(buf + len, ": %s", (char*) status_string.value);
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len += status_string.length;
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}
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gss_release_buffer(&min_stat, &status_string);
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} while (!GSS_ERROR(maj_stat) && msg_ctx != 0);
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infof(conn->data, buf);
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}
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int Curl_input_negotiate(struct connectdata *conn, char *header)
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{
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struct negotiatedata *neg_ctx = &conn->data->state.negotiate;
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OM_uint32 major_status, minor_status, minor_status2;
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gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
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gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
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int ret;
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size_t len;
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bool gss;
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const char* protocol;
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while(*header && isspace((int)*header))
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header++;
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if(checkprefix("GSS-Negotiate", header)) {
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protocol = "GSS-Negotiate";
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gss = TRUE;
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}
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else if (checkprefix("Negotiate", header)) {
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protocol = "Negotiate";
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gss = FALSE;
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}
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else
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return -1;
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if (neg_ctx->context) {
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if (neg_ctx->gss != gss) {
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return -1;
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}
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}
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else {
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neg_ctx->protocol = protocol;
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neg_ctx->gss = gss;
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}
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if (neg_ctx->context && neg_ctx->status == GSS_S_COMPLETE) {
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/* We finished succesfully 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 (neg_ctx->server_name == NULL &&
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(ret = get_gss_name(conn, &neg_ctx->server_name)))
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return ret;
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header += strlen(neg_ctx->protocol);
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while(*header && isspace((int)*header))
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header++;
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len = strlen(header);
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if (len > 0) {
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int rawlen;
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input_token.length = (len+3)/4 * 3;
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input_token.value = malloc(input_token.length);
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if (input_token.value == NULL)
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return ENOMEM;
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rawlen = Curl_base64_decode(header, input_token.value);
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if (rawlen < 0)
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return -1;
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input_token.length = rawlen;
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#ifdef HAVE_SPNEGO /* Handle SPNEGO */
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if (checkprefix("Negotiate", header)) {
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ASN1_OBJECT * object = NULL;
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int rc = 1;
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unsigned char * spnegoToken = NULL;
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size_t spnegoTokenLength = 0;
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unsigned char * mechToken = NULL;
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size_t mechTokenLength = 0;
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spnegoToken = malloc(input_token.length);
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if (input_token.value == NULL)
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return ENOMEM;
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spnegoTokenLength = input_token.length;
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object = OBJ_txt2obj ("1.2.840.113554.1.2.2", 1);
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if (!parseSpnegoTargetToken(spnegoToken,
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spnegoTokenLength,
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NULL,
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NULL,
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&mechToken,
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&mechTokenLength,
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NULL,
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NULL)) {
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free(spnegoToken);
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spnegoToken = NULL;
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infof(conn->data, "Parse SPNEGO Target Token failed\n");
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}
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else {
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free(input_token.value);
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input_token.value = NULL;
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input_token.value = malloc(mechTokenLength);
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memcpy(input_token.value, mechToken,mechTokenLength);
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input_token.length = mechTokenLength;
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free(mechToken);
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mechToken = NULL;
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infof(conn->data, "Parse SPNEGO Target Token succeded\n");
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}
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}
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#endif
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}
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major_status = gss_init_sec_context(&minor_status,
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GSS_C_NO_CREDENTIAL,
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&neg_ctx->context,
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neg_ctx->server_name,
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GSS_C_NO_OID,
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GSS_C_DELEG_FLAG,
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0,
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GSS_C_NO_CHANNEL_BINDINGS,
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&input_token,
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NULL,
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&output_token,
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NULL,
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NULL);
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if (input_token.length > 0)
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gss_release_buffer(&minor_status2, &input_token);
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neg_ctx->status = major_status;
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if (GSS_ERROR(major_status)) {
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/* Curl_cleanup_negotiate(conn->data) ??? */
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log_gss_error(conn, minor_status,
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(char *)"gss_init_sec_context() failed: ");
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return -1;
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}
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if (output_token.length == 0) {
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return -1;
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}
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neg_ctx->output_token = output_token;
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/* conn->bits.close = FALSE; */
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return 0;
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}
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CURLcode Curl_output_negotiate(struct connectdata *conn)
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{
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struct negotiatedata *neg_ctx = &conn->data->state.negotiate;
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OM_uint32 minor_status;
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char *encoded = NULL;
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int len;
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#ifdef HAVE_SPNEGO /* Handle SPNEGO */
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if (checkprefix("Negotiate",neg_ctx->protocol)) {
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ASN1_OBJECT * object = NULL;
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int rc = 1;
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unsigned char * spnegoToken = NULL;
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size_t spnegoTokenLength = 0;
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unsigned char * responseToken = NULL;
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size_t responseTokenLength = 0;
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responseToken = malloc(neg_ctx->output_token.length);
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if ( responseToken == NULL)
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return CURLE_OUT_OF_MEMORY;
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memcpy(responseToken, neg_ctx->output_token.value,
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neg_ctx->output_token.length);
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responseTokenLength = neg_ctx->output_token.length;
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object=OBJ_txt2obj ("1.2.840.113554.1.2.2", 1);
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if (!makeSpnegoInitialToken (object,
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responseToken,
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responseTokenLength,
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&spnegoToken,
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&spnegoTokenLength)) {
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free(responseToken);
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responseToken = NULL;
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infof(conn->data, "Make SPNEGO Initial Token failed\n");
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}
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else {
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free(neg_ctx->output_token.value);
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responseToken = NULL;
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neg_ctx->output_token.value = malloc(spnegoTokenLength);
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memcpy(neg_ctx->output_token.value, spnegoToken,spnegoTokenLength);
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neg_ctx->output_token.length = spnegoTokenLength;
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free(spnegoToken);
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spnegoToken = NULL;
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infof(conn->data, "Make SPNEGO Initial Token succeded\n");
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}
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}
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#endif
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len = Curl_base64_encode(neg_ctx->output_token.value,
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neg_ctx->output_token.length,
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&encoded);
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if (len < 0)
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return CURLE_OUT_OF_MEMORY;
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conn->allocptr.userpwd =
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aprintf("Authorization: %s %s\r\n", neg_ctx->protocol, encoded);
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free(encoded);
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gss_release_buffer(&minor_status, &neg_ctx->output_token);
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return (conn->allocptr.userpwd == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK;
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}
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void Curl_cleanup_negotiate(struct SessionHandle *data)
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{
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OM_uint32 minor_status;
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struct negotiatedata *neg_ctx = &data->state.negotiate;
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if (neg_ctx->context != GSS_C_NO_CONTEXT)
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gss_delete_sec_context(&minor_status, &neg_ctx->context, GSS_C_NO_BUFFER);
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if (neg_ctx->output_token.length != 0)
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gss_release_buffer(&minor_status, &neg_ctx->output_token);
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if (neg_ctx->server_name != GSS_C_NO_NAME)
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gss_release_name(&minor_status, &neg_ctx->server_name);
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memset(neg_ctx, 0, sizeof(*neg_ctx));
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}
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#endif
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#endif
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