mirror of
https://github.com/moparisthebest/curl
synced 2024-08-13 17:03:50 -04:00
fd00b382b2
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.
375 lines
11 KiB
C
375 lines
11 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 - 2011, 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 "setup.h"
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#ifdef HAVE_GSSAPI
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#ifdef HAVE_OLD_GSSMIT
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#define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
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#define NCOMPAT 1
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#endif
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#ifndef CURL_DISABLE_HTTP
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#include "urldata.h"
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#include "sendf.h"
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#include "curl_gssapi.h"
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#include "rawstr.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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#ifdef HAVE_SPNEGO
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# include <spnegohelp.h>
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# ifdef USE_SSLEAY
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# ifdef USE_OPENSSL
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# include <openssl/objects.h>
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# else
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# include <objects.h>
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# endif
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# else
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# error "Can't compile SPNEGO support without OpenSSL."
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# endif
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#endif
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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, gss_name_t *server)
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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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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(proxy ? conn->proxy.name :
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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, proxy ? conn->proxy.name :
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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,
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const 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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/* 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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struct SessionHandle *data = conn->data;
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struct negotiatedata *neg_ctx = proxy?&data->state.proxyneg:
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&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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size_t rawlen = 0;
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bool gss;
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const char* protocol;
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CURLcode error;
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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 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(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, proxy, &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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error = Curl_base64_decode(header,
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(unsigned char **)&input_token.value, &rawlen);
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if(error || 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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if(input_token.value == NULL)
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return CURLE_OUT_OF_MEMORY;
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spnegoToken = malloc(input_token.length);
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if(spnegoToken == NULL)
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return CURLE_OUT_OF_MEMORY;
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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(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 = malloc(mechTokenLength);
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if(input_token.value == NULL)
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return CURLE_OUT_OF_MEMORY;
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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(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 = Curl_gss_init_sec_context(data,
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&minor_status,
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&neg_ctx->context,
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neg_ctx->server_name,
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GSS_C_NO_CHANNEL_BINDINGS,
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&input_token,
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&output_token,
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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(data) ??? */
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log_gss_error(conn, minor_status,
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"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, 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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#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(responseToken);
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responseToken = NULL;
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free(neg_ctx->output_token.value);
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neg_ctx->output_token.value = malloc(spnegoTokenLength);
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if(neg_ctx->output_token.value == NULL) {
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free(spnegoToken);
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spnegoToken = NULL;
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return CURLE_OUT_OF_MEMORY;
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}
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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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error = Curl_base64_encode(conn->data,
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neg_ctx->output_token.value,
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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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Curl_safefree(neg_ctx->output_token.value);
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neg_ctx->output_token.value = NULL;
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return error;
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}
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if(len == 0) {
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Curl_safefree(neg_ctx->output_token.value);
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neg_ctx->output_token.value = NULL;
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return CURLE_REMOTE_ACCESS_DENIED;
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}
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userp = aprintf("%sAuthorization: %s %s\r\n", proxy ? "Proxy-" : "",
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neg_ctx->protocol, encoded);
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if(proxy)
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conn->allocptr.proxyuserpwd = userp;
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else
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conn->allocptr.userpwd = userp;
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free(encoded);
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Curl_cleanup_negotiate (conn->data);
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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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OM_uint32 minor_status;
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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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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
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#endif
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