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-rw-r--r--lib/http_negotiate_sspi.c292
1 files changed, 292 insertions, 0 deletions
diff --git a/lib/http_negotiate_sspi.c b/lib/http_negotiate_sspi.c
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+++ b/lib/http_negotiate_sspi.c
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+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+#include "setup.h"
+
+#ifdef USE_WINDOWS_SSPI
+
+#ifndef CURL_DISABLE_HTTP
+/* -- WIN32 approved -- */
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <ctype.h>
+
+#include "urldata.h"
+#include "sendf.h"
+#include "rawstr.h"
+#include "curl_base64.h"
+#include "http_negotiate.h"
+#include "curl_memory.h"
+
+#define _MPRINTF_REPLACE /* use our functions only */
+#include <curl/mprintf.h>
+
+/* The last #include file should be: */
+#include "memdebug.h"
+
+static int
+get_gss_name(struct connectdata *conn, bool proxy, char *server)
+{
+ struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
+ &conn->data->state.negotiate;
+ const char* service;
+ size_t length;
+
+ /* GSSAPI implementation by Globus (known as GSI) requires the name to be
+ of form "<service>/<fqdn>" instead of <service>@<fqdn> (ie. slash instead
+ of at-sign). Also GSI servers are often identified as 'host' not 'khttp'.
+ Change following lines if you want to use GSI */
+
+ /* IIS uses the <service>@<fqdn> form but uses 'http' as the service name,
+ and SSPI then generates an NTLM token. When using <service>/<fqdn> a
+ Kerberos token is generated. */
+
+ if(neg_ctx->gss)
+ service = "KHTTP";
+ else
+ service = "HTTP";
+
+ length = strlen(service) + 1 + strlen(proxy ? conn->proxy.name :
+ conn->host.name) + 1;
+ if(length + 1 > sizeof(neg_ctx->server_name))
+ return EMSGSIZE;
+
+ snprintf(server, sizeof(neg_ctx->server_name), "%s/%s",
+ service, proxy ? conn->proxy.name : conn->host.name);
+
+ return 0;
+}
+
+/* returning zero (0) means success, everything else is treated as "failure"
+ with no care exactly what the failure was */
+int Curl_input_negotiate(struct connectdata *conn, bool proxy,
+ const char *header)
+{
+ struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
+ &conn->data->state.negotiate;
+ BYTE *input_token = 0;
+ SecBufferDesc out_buff_desc;
+ SecBuffer out_sec_buff;
+ SecBufferDesc in_buff_desc;
+ SecBuffer in_sec_buff;
+ ULONG context_attributes;
+ TimeStamp lifetime;
+
+ int ret;
+ size_t len = 0, input_token_len = 0;
+ bool gss = FALSE;
+ const char* protocol;
+
+ while(*header && ISSPACE(*header))
+ header++;
+
+ if(checkprefix("GSS-Negotiate", header)) {
+ protocol = "GSS-Negotiate";
+ gss = TRUE;
+ }
+ else if(checkprefix("Negotiate", header)) {
+ protocol = "Negotiate";
+ gss = FALSE;
+ }
+ else
+ return -1;
+
+ if(neg_ctx->context) {
+ if(neg_ctx->gss != gss) {
+ return -1;
+ }
+ }
+ else {
+ neg_ctx->protocol = protocol;
+ neg_ctx->gss = gss;
+ }
+
+ if(neg_ctx->context && neg_ctx->status == SEC_E_OK) {
+ /* We finished succesfully our part of authentication, but server
+ * rejected it (since we're again here). Exit with an error since we
+ * can't invent anything better */
+ Curl_cleanup_negotiate(conn->data);
+ return -1;
+ }
+
+ if(strlen(neg_ctx->server_name) == 0 &&
+ (ret = get_gss_name(conn, proxy, neg_ctx->server_name)))
+ return ret;
+
+ if (!neg_ctx->max_token_length) {
+ PSecPkgInfo SecurityPackage;
+ ret = s_pSecFn->QuerySecurityPackageInfo("Negotiate", &SecurityPackage);
+ if (ret != SEC_E_OK)
+ return -1;
+
+ /* Allocate input and output buffers according to the max token size
+ as indicated by the security package */
+ neg_ctx->max_token_length = SecurityPackage->cbMaxToken;
+ neg_ctx->output_token = (BYTE *)malloc(neg_ctx->max_token_length);
+ s_pSecFn->FreeContextBuffer(SecurityPackage);
+ }
+
+ /* Obtain the input token, if any */
+ header += strlen(neg_ctx->protocol);
+ while(*header && ISSPACE(*header))
+ header++;
+
+ len = strlen(header);
+ if(len > 0) {
+ input_token = malloc(neg_ctx->max_token_length);
+ if(!input_token)
+ return -1;
+
+ input_token_len = Curl_base64_decode(header,
+ (unsigned char **)&input_token);
+ if(input_token_len == 0)
+ return -1;
+ }
+
+ if ( !input_token ) {
+ /* first call in a new negotation, we have to require credentials,
+ and allocate memory for the context */
+
+ neg_ctx->credentials = (CredHandle *)malloc(sizeof(CredHandle));
+ neg_ctx->context = (CtxtHandle *)malloc(sizeof(CtxtHandle));
+
+ if ( !neg_ctx->credentials || !neg_ctx->context)
+ return -1;
+
+ neg_ctx->status =
+ s_pSecFn->AcquireCredentialsHandle(NULL, "Negotiate",
+ SECPKG_CRED_OUTBOUND, NULL, NULL,
+ NULL, NULL, neg_ctx->credentials,
+ &lifetime);
+ if ( neg_ctx->status != SEC_E_OK )
+ return -1;
+ }
+
+ /* prepare the output buffers, and input buffers if present */
+ out_buff_desc.ulVersion = 0;
+ out_buff_desc.cBuffers = 1;
+ out_buff_desc.pBuffers = &out_sec_buff;
+
+ out_sec_buff.cbBuffer = neg_ctx->max_token_length;
+ out_sec_buff.BufferType = SECBUFFER_TOKEN;
+ out_sec_buff.pvBuffer = neg_ctx->output_token;
+
+
+ if (input_token) {
+ in_buff_desc.ulVersion = 0;
+ in_buff_desc.cBuffers = 1;
+ in_buff_desc.pBuffers = &out_sec_buff;
+
+ in_sec_buff.cbBuffer = input_token_len;
+ in_sec_buff.BufferType = SECBUFFER_TOKEN;
+ in_sec_buff.pvBuffer = input_token;
+ }
+
+ neg_ctx->status = s_pSecFn->InitializeSecurityContext(
+ neg_ctx->credentials,
+ input_token ? neg_ctx->context : 0,
+ neg_ctx->server_name,
+ ISC_REQ_CONFIDENTIALITY,
+ 0,
+ SECURITY_NATIVE_DREP,
+ input_token ? &in_buff_desc : 0,
+ 0,
+ neg_ctx->context,
+ &out_buff_desc,
+ &context_attributes,
+ &lifetime);
+
+ if ( GSS_ERROR(neg_ctx->status) )
+ return -1;
+
+ if ( neg_ctx->status == SEC_I_COMPLETE_NEEDED ||
+ neg_ctx->status == SEC_I_COMPLETE_AND_CONTINUE ) {
+ neg_ctx->status = s_pSecFn->CompleteAuthToken(neg_ctx->context,
+ &out_buff_desc);
+ if ( GSS_ERROR(neg_ctx->status) )
+ return -1;
+ }
+
+ neg_ctx->output_token_length = out_sec_buff.cbBuffer;
+
+ return 0;
+}
+
+
+CURLcode Curl_output_negotiate(struct connectdata *conn, bool proxy)
+{
+ struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
+ &conn->data->state.negotiate;
+ char *encoded = NULL;
+ size_t len;
+ char *userp;
+
+ len = Curl_base64_encode(conn->data,
+ neg_ctx->output_token,
+ neg_ctx->output_token_length,
+ &encoded);
+
+ if(len == 0)
+ return CURLE_OUT_OF_MEMORY;
+
+ userp = aprintf("%sAuthorization: %s %s\r\n", proxy ? "Proxy-" : "",
+ neg_ctx->protocol, encoded);
+
+ if(proxy)
+ conn->allocptr.proxyuserpwd = userp;
+ else
+ conn->allocptr.userpwd = userp;
+ free(encoded);
+ Curl_cleanup_negotiate (conn->data);
+ return (userp == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK;
+}
+
+static void cleanup(struct negotiatedata *neg_ctx)
+{
+ if(neg_ctx->context) {
+ s_pSecFn->DeleteSecurityContext(neg_ctx->context);
+ free(neg_ctx->context);
+ neg_ctx->context = 0;
+ }
+
+ if(neg_ctx->credentials) {
+ s_pSecFn->FreeCredentialsHandle(neg_ctx->credentials);
+ free(neg_ctx->credentials);
+ neg_ctx->credentials = 0;
+ }
+
+ if(neg_ctx->output_token) {
+ free(neg_ctx->output_token);
+ neg_ctx->output_token = 0;
+ }
+}
+
+void Curl_cleanup_negotiate(struct SessionHandle *data)
+{
+ cleanup(&data->state.negotiate);
+ cleanup(&data->state.proxyneg);
+}
+
+
+#endif
+#endif
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