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authorSteve Holme <steve_holme@hotmail.com>2016-03-13 18:51:46 +0000
committerSteve Holme <steve_holme@hotmail.com>2016-03-26 17:21:22 +0000
commit6d6f9ca1d978817af2f2780dafcceba281256e11 (patch)
tree0a896330689e964a719d1e1f8bc311422de66da5 /lib/vauth/spnego_gssapi.c
parentad5e9bfd5d08b5a1c5217b3eb709dc90505abaab (diff)
vauth: Moved the Negotiate authentication code to the new vauth directory
Part 2 of 2 - Moved the GSS-API based Negotiate authentication code.
Diffstat (limited to 'lib/vauth/spnego_gssapi.c')
-rw-r--r--lib/vauth/spnego_gssapi.c257
1 files changed, 257 insertions, 0 deletions
diff --git a/lib/vauth/spnego_gssapi.c b/lib/vauth/spnego_gssapi.c
new file mode 100644
index 000000000..9aa96dfdb
--- /dev/null
+++ b/lib/vauth/spnego_gssapi.c
@@ -0,0 +1,257 @@
+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2016, 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.
+ *
+ * RFC4178 Simple and Protected GSS-API Negotiation Mechanism
+ *
+ ***************************************************************************/
+
+#include "curl_setup.h"
+
+#if defined(HAVE_GSSAPI) && defined(USE_SPNEGO)
+
+#include <curl/curl.h>
+
+#include "vauth/vauth.h"
+#include "urldata.h"
+#include "curl_base64.h"
+#include "curl_gssapi.h"
+#include "warnless.h"
+#include "curl_multibyte.h"
+#include "sendf.h"
+
+/* The last #include files should be: */
+#include "curl_memory.h"
+#include "memdebug.h"
+
+/*
+ * Curl_auth_decode_spnego_message()
+ *
+ * This is used to decode an already encoded SPNEGO (Negotiate) challenge
+ * message.
+ *
+ * Parameters:
+ *
+ * data [in] - The session handle.
+ * userp [in] - The user name in the format User or Domain\User.
+ * passdwp [in] - The user's password.
+ * service [in] - The service type such as www, smtp, pop or imap.
+ * hostname [in] - The host name.
+ * chlg64 [in] - The optional base64 encoded challenge message.
+ * nego [in/out] - The Negotiate data struct being used and modified.
+ *
+ * Returns CURLE_OK on success.
+ */
+CURLcode Curl_auth_decode_spnego_message(struct SessionHandle *data,
+ const char *user,
+ const char *password,
+ const char *service,
+ const char *host,
+ const char *chlg64,
+ struct negotiatedata *nego)
+{
+ CURLcode result = CURLE_OK;
+ size_t chlglen = 0;
+ unsigned char *chlg = NULL;
+ OM_uint32 major_status;
+ OM_uint32 minor_status;
+ OM_uint32 unused_status;
+ gss_buffer_desc spn_token = GSS_C_EMPTY_BUFFER;
+ gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
+ gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
+
+ (void) user;
+ (void) password;
+
+ if(nego->context && nego->status == GSS_S_COMPLETE) {
+ /* We finished successfully 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_auth_spnego_cleanup(nego);
+ return CURLE_LOGIN_DENIED;
+ }
+
+ /* Generate our SPN */
+ if(!nego->server_name) {
+ char *spn = Curl_auth_build_gssapi_spn(service, host);
+ if(!spn)
+ return CURLE_OUT_OF_MEMORY;
+
+ /* Populate the SPN structure */
+ spn_token.value = spn;
+ spn_token.length = strlen(spn);
+
+ /* Import the SPN */
+ major_status = gss_import_name(&minor_status, &spn_token,
+ GSS_C_NT_HOSTBASED_SERVICE,
+ &nego->server_name);
+ if(GSS_ERROR(major_status)) {
+ Curl_gss_log_error(data, minor_status, "gss_import_name() failed: ");
+
+ free(spn);
+
+ return CURLE_OUT_OF_MEMORY;
+ }
+
+ free(spn);
+ }
+
+ if(chlg64 && strlen(chlg64)) {
+ /* Decode the base-64 encoded challenge message */
+ if(*chlg64 != '=') {
+ result = Curl_base64_decode(chlg64, &chlg, &chlglen);
+ if(result)
+ return result;
+ }
+
+ /* Ensure we have a valid challenge message */
+ if(!chlg) {
+ infof(data, "SPNEGO handshake failure (empty challenge message)\n");
+
+ return CURLE_BAD_CONTENT_ENCODING;
+ }
+
+ /* Setup the challenge "input" security buffer */
+ input_token.value = chlg;
+ input_token.length = chlglen;
+ }
+
+ /* Generate our challenge-response message */
+ major_status = Curl_gss_init_sec_context(data,
+ &minor_status,
+ &nego->context,
+ nego->server_name,
+ &Curl_spnego_mech_oid,
+ GSS_C_NO_CHANNEL_BINDINGS,
+ &input_token,
+ &output_token,
+ TRUE,
+ NULL);
+ Curl_safefree(input_token.value);
+
+ nego->status = major_status;
+ if(GSS_ERROR(major_status)) {
+ if(output_token.value)
+ gss_release_buffer(&unused_status, &output_token);
+
+ Curl_gss_log_error(data, minor_status,
+ "gss_init_sec_context() failed: ");
+
+ return CURLE_OUT_OF_MEMORY;
+ }
+
+ if(!output_token.value || !output_token.length) {
+ if(output_token.value)
+ gss_release_buffer(&unused_status, &output_token);
+
+ return CURLE_OUT_OF_MEMORY;
+ }
+
+ nego->output_token = output_token;
+
+ return CURLE_OK;
+}
+
+/*
+ * Curl_auth_create_spnego_message()
+ *
+ * This is used to generate an already encoded SPNEGO (Negotiate) response
+ * message ready for sending to the recipient.
+ *
+ * Parameters:
+ *
+ * data [in] - The session handle.
+ * nego [in/out] - The Negotiate data struct being used and modified.
+ * outptr [in/out] - The address where a pointer to newly allocated memory
+ * holding the result will be stored upon completion.
+ * outlen [out] - The length of the output message.
+ *
+ * Returns CURLE_OK on success.
+ */
+CURLcode Curl_auth_create_spnego_message(struct SessionHandle *data,
+ struct negotiatedata *nego,
+ char **outptr, size_t *outlen)
+{
+ CURLcode result;
+ OM_uint32 minor_status;
+
+ /* Base64 encode the already generated response */
+ result = Curl_base64_encode(data,
+ nego->output_token.value,
+ nego->output_token.length,
+ outptr, outlen);
+
+ if(result) {
+ gss_release_buffer(&minor_status, &nego->output_token);
+ nego->output_token.value = NULL;
+ nego->output_token.length = 0;
+
+ return result;
+ }
+
+ if(!*outptr || !*outlen) {
+ gss_release_buffer(&minor_status, &nego->output_token);
+ nego->output_token.value = NULL;
+ nego->output_token.length = 0;
+
+ return CURLE_REMOTE_ACCESS_DENIED;
+ }
+
+ return CURLE_OK;
+}
+
+/*
+ * Curl_auth_spnego_cleanup()
+ *
+ * This is used to clean up the SPNEGO (Negotiate) specific data.
+ *
+ * Parameters:
+ *
+ * nego [in/out] - The Negotiate data struct being cleaned up.
+ *
+ */
+void Curl_auth_spnego_cleanup(struct negotiatedata* nego)
+{
+ OM_uint32 minor_status;
+
+ /* Free our security context */
+ if(nego->context != GSS_C_NO_CONTEXT) {
+ gss_delete_sec_context(&minor_status, &nego->context, GSS_C_NO_BUFFER);
+ nego->context = GSS_C_NO_CONTEXT;
+ }
+
+ /* Free the output token */
+ if(nego->output_token.value) {
+ gss_release_buffer(&minor_status, &nego->output_token);
+ nego->output_token.value = NULL;
+ nego->output_token.length = 0;
+
+ }
+
+ /* Free the SPN */
+ if(nego->server_name != GSS_C_NO_NAME) {
+ gss_release_name(&minor_status, &nego->server_name);
+ nego->server_name = GSS_C_NO_NAME;
+ }
+
+ /* Reset any variables */
+ nego->status = 0;
+}
+
+#endif /* HAVE_GSSAPI && USE_SPNEGO */