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44d84ac164
could very well cause a negate number get passed in and thus cause reading outside of the array usually used for this purpose. We avoid this by using the uppercase macro versions introduced just now that does some extra crazy typecasts to avoid byte codes > 127 to cause negative int values.
327 lines
10 KiB
C
327 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 - 2006, 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 "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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#include "memory.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, 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->host.name) + 1;
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if (token.length + 1 > sizeof(name))
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return EMSGSIZE;
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snprintf(name, sizeof(name), "%s@%s", service, conn->host.name);
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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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snprintf(buf + len, sizeof(buf) - len,
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": %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, "%s", 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(*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(*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 = Curl_base64_decode(header, (unsigned char **)&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 succeeded\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 succeeded\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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