/*
- * Copyright (c) 2010 CESNET
+ * Copyright (c) 2012, 2013, 2014 JANET(UK)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
+ * modification, are permitted provided that the following conditions
+ * are met:
*
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
- * 3. Neither the name of CESNET nor the names of its contributors may
- * be used to endorse or promote products derived from this software
+ * 3. Neither the name of JANET(UK) nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * NOTE: Some code in this module was derived from code in
+ * mod_auth_gssapi.c which is copyrighted by CESNET. See that file
+ * for full copyright details.
+ *
+ * NOTE: Portions of the code in this file were derived from example
+ * code distributed under the Apache 2.0 license:
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * This module implements the Apache server side of the GSSWeb
+ * authentiction type which allows Moonshot to be used for
+ * authentication in web applications. The module consists of two
+ * components: the hook function (gssweb_authenticate_user) that does
+ * most of the work, and an output filter (gssweb_authenticate_filter)
+ * that is registered by the hook function to send the output token
+ * back to the client in a json message that wraps the original
+ * response content.
+ *
+ * This module uses a simple protocol between the client and server
+ * to exchange GSS tokens and nonce information. The protocol is
+ * described in the protocol.txt file included with module source.
*/
+#include <stdio.h>
#include "mod_auth_gssweb.h"
module AP_MODULE_DECLARE_DATA auth_gssweb_module;
{ NULL }
};
+
+#define DEFAULT_ENCTYPE "application/x-www-form-urlencoded"
+#define GSS_MAX_TOKEN_SIZE 4096 //TBD -- check this value
-static int
-gssweb_authenticate_user(request_rec *r)
+/* gssweb_read_req() -- reads the request data into a buffer
+ */
+static int gssweb_read_req(request_rec *r, const char **rbuf, apr_off_t *size)
{
- gss_auth_config *conf =
- (gss_auth_config *) ap_get_module_config(r->per_dir_config,
- &auth_gssweb_module);
- const char *auth_line = NULL;
- const char *type = NULL;
- char *auth_type = NULL;
- char *negotiate_ret_value = NULL;
- gss_conn_ctx conn_ctx = NULL;
- int ret;
-
- gss_log(APLOG_MARK, APLOG_DEBUG, 0, r, "Entering GSSWeb authentication");
-
- /* get the type specified in Apache configuration */
- type = ap_auth_type(r);
- if (type == NULL || strcasecmp(type, "GSSWeb") != 0) {
- gss_log(APLOG_MARK, APLOG_DEBUG, 0, r,
- "AuthType '%s' is not for us, bailing out",
- (type) ? type : "(NULL)");
+ int rc = OK;
+
+ if((rc = ap_setup_client_block(r, REQUEST_CHUNKED_ERROR))) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r, "gssweb_get_post_data: Failed to set up client block");
+ return(rc);
+ }
+
+ if(ap_should_client_block(r)) {
+ char argsbuffer[HUGE_STRING_LEN];
+ apr_off_t rsize, len_read, rpos = 0;
+ apr_off_t length = r->remaining;
- return DECLINED;
+ *rbuf = (const char *) apr_pcalloc(r->pool, (apr_size_t) (length + 1));
+ *size = length;
+ while((len_read = ap_get_client_block(r, argsbuffer, sizeof(argsbuffer))) > 0) {
+ if((rpos + len_read) > length) {
+ rsize = length - rpos;
+ }
+ else {
+ rsize = len_read;
+ }
+
+ memcpy((char *) *rbuf + rpos, argsbuffer, (size_t) rsize);
+ rpos += rsize;
}
+ }
+ return(rc);
+}
- /* get what the user sent us in the HTTP header */
- auth_line = apr_table_get(r->headers_in, (r->proxyreq == PROXYREQ_PROXY)
- ? "Proxy-Authorization"
- : "Authorization");
- if (auth_line == NULL) {
- gss_log(APLOG_MARK, APLOG_DEBUG, 0, r,
- "Client hasn't sent an authorization header, giving up");
- set_http_headers(r, conf, "\0");
- return HTTP_UNAUTHORIZED;
+/* gssweb_get_post_data() -- Gets the token and nonce from the request
+ * data.
+ */
+static int gssweb_get_post_data(request_rec *r, unsigned int *nonce, gss_buffer_desc *input_token)
+{
+ const char *data;
+ apr_off_t datalen;
+ const char *key, *val, *type;
+ int rc = 0;
+ size_t len;
+
+ *nonce = 0;
+ input_token->length = 0;
+ input_token->value = NULL;
+
+ gss_log(APLOG_MARK, APLOG_DEBUG, 0, r, "gssweb_get_post_data: Entering function");
+
+ if(r->method_number != M_POST) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r, "gssweb_get_post_data: Request data is not a POST, declining.");
+ return DECLINED;
+ }
+
+ type = apr_table_get(r->headers_in, "Content-Type");
+ if(strncasecmp(type, DEFAULT_ENCTYPE, strlen(DEFAULT_ENCTYPE)) != 0) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r, "gssweb_get_post_data: Unexpected content type, declining.");
+ return DECLINED;
+ }
+
+ if((rc = gssweb_read_req(r, &data, &datalen)) != OK) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r, "gssweb_get_post_data: Data read error, rc = %d", rc);
+ return rc;
+ }
+
+ while(*data && (val = ap_getword(r->pool, &data, '&'))) {
+ key = ap_getword(r->pool, &val, '=');
+ ap_unescape_url((char*)key);
+ ap_unescape_url((char*)val);
+ if (0 == strcasecmp(key, "token")) {
+ gss_log(APLOG_MARK, APLOG_DEBUG, 0, r, "gssweb_get_post_data: Found encoded token: %s", val);
+ len = apr_base64_decode_len(val);
+ if (NULL == (input_token->value = apr_pcalloc(r->pool, len+1))) {
+ }
+ input_token->length = apr_base64_decode(input_token->value, val);
+ }
+ else if (0 == strcasecmp(key, "nonce")) {
+ gss_log(APLOG_MARK, APLOG_DEBUG, 0, r, "gssweb_get_post_data: Found nonce: %s", val);
+ *nonce = atoi(val);
}
+ else {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r, "gssweb_get_post_data: unknown key (%s), ignored", key);
+ }
+ }
+ if ((0 == *nonce) || (0 == input_token->length)) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r, "gssweb_get_post_data: nonce (%d) or token len (%d) is 0, declining", *nonce, input_token->length);
+ return DECLINED;
+ }
+ else {
+ gss_log(APLOG_MARK, APLOG_DEBUG, 0, r, "gssweb_get_post_data: returning nonce (%d) and token (%d bytes)", *nonce, input_token->length);
+ return OK;
+ }
+}
- auth_type = ap_getword_white(r->pool, &auth_line);
- if (strcasecmp(auth_type, "gssweb") != 0) {
- gss_log(APLOG_MARK, APLOG_DEBUG, 0, r,
- "Unsupported authentication type (%s) requested by client",
- (auth_type) ? auth_type : "(NULL)");
- set_http_headers(r, conf, "\0");
- return HTTP_UNAUTHORIZED;
+/* gssweb_authenticate_filter() -- Output filter for gssweb authentication.
+ * Wraps original response in JSON -- adding JSON to the beginning of the
+ * response, escapes double quotes in the original response, and adds JSON
+ * to the end of the response. Handles responses that involve more than
+ * one filter call by maintaining state until an EOS bucket is received.
+ */
+static apr_status_t gssweb_authenticate_filter (ap_filter_t *f,
+ apr_bucket_brigade *brig_in)
+{
+ request_rec *r = f->r;
+ conn_rec *c = r->connection;
+ apr_bucket_brigade *brig_out;
+ apr_bucket *bkt_in = NULL;
+ apr_bucket *bkt_out = NULL;
+ apr_bucket *bkt_eos = NULL;
+ const char *data = NULL;
+ apr_size_t len = 0;
+ apr_size_t enc_len = 0;
+ char *buf = NULL;
+ char *stoken = NULL;
+ apr_size_t n = 0;
+ gss_conn_ctx conn_ctx = NULL;
+ const char *c_type = NULL;
+ const char *c_len = NULL;
+ apr_status_t ret = 0;
+
+ gss_log(APLOG_MARK, APLOG_DEBUG, 0, f->r, "Entering GSSWeb filter");
+
+ /* Get the context from the request. If the context is NULL or
+ * there is no outstanding request (no nonce set), just forward
+ * all of the buckets as-is, because the client isn't gssweb
+ */
+ if ((NULL == (conn_ctx = gss_retrieve_conn_ctx(r))) ||
+ (0 == conn_ctx->nonce)) {
+ for (bkt_in = APR_BRIGADE_FIRST(brig_in);
+ bkt_in != APR_BRIGADE_SENTINEL(brig_in);
+ bkt_in = APR_BUCKET_NEXT(bkt_in))
+ {
+ if (NULL == (brig_out = apr_brigade_create(r->pool, c->bucket_alloc))) {
+ apr_brigade_cleanup(brig_in);
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+ apr_bucket_copy(bkt_in, &bkt_out);
+ APR_BRIGADE_INSERT_TAIL(brig_out, bkt_out);
+ ap_pass_brigade(f->next, brig_out);
+ }
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r, "gssweb_authenticate_filter: Failed to find valid context");
+ apr_brigade_cleanup(brig_in);
+ return OK;
+ }
+
+ c_type = apr_table_get(r->headers_in, "Content-Type");
+ c_len = apr_table_get(r->headers_in, "Content-Length");
+ /* clear content-length and MD5 checksum */
+ apr_table_unset(r->headers_out, "Content-Length");
+ apr_table_unset(r->headers_out, "Content-MD5");
+ gss_log(APLOG_MARK, APLOG_DEBUG, 0, r, "gssweb_authenticate_filter: Received Content-Type: %s, Content-Length: %d", c_type, c_len);
+
+ /* If this is the first call for a response, send opening JSON block */
+ if (GSS_FILT_NEW == conn_ctx->filter_stat) {
+ gss_log(APLOG_MARK, APLOG_DEBUG, 0, r, "gssweb_authenticate_filter: First filter call for response");
+ if (NULL == (brig_out = apr_brigade_create(r->pool, c->bucket_alloc))) {
+ conn_ctx->filter_stat = GSS_FILT_ERROR;
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r, "gssweb_authenticate_filter: Unable to allocate output brigade (opening)");
+ apr_brigade_cleanup(brig_in);
+ return HTTP_INTERNAL_SERVER_ERROR;
}
- conn_ctx = gss_get_conn_ctx(r);
- if (conn_ctx == NULL) {
- gss_log(APLOG_MARK, APLOG_ERR, 0, r,
- "Failed to create internal context: probably not enough memory");
- return HTTP_INTERNAL_SERVER_ERROR;
+ /* Encode the output token */
+ len = apr_base64_encode_len(conn_ctx->output_token.length);
+ if (NULL == (stoken = apr_bucket_alloc(len+1, c->bucket_alloc))) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r, "gssweb_authenticate_filter: Unable to allocate space for encoded output token");
+ apr_brigade_cleanup(brig_in);
+ apr_brigade_cleanup(brig_out);
+ return HTTP_INTERNAL_SERVER_ERROR;
}
+ apr_base64_encode_binary(stoken, conn_ctx->output_token.value, conn_ctx->output_token.length);
- /* optimizing hack */
- if (conn_ctx->state == GSS_CTX_ESTABLISHED && auth_line == NULL) {
- r->user = apr_pstrdup(r->pool, conn_ctx->user);
- r->ap_auth_type = "Negotiate";
- return OK;
+ if (NULL == (data = apr_bucket_alloc(len+1024, c->bucket_alloc))) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r, "gssweb_authenticate_filter: Unable to allocate space for opening JSON block");
+ apr_brigade_cleanup(brig_in);
+ apr_brigade_cleanup(brig_out);
+ return HTTP_INTERNAL_SERVER_ERROR;
}
- /* XXXX subrequests ignored, only successful accesses taken into account! */
- if (!ap_is_initial_req(r) && conn_ctx->state == GSS_CTX_ESTABLISHED) {
- r->user = apr_pstrdup(r->pool, conn_ctx->user);
- r->ap_auth_type = "Negotiate";
- return OK;
+ /* Send opening JSON block */
+ snprintf((char *)data, len+1024,
+ "{\"gssweb\": {\n\"token\": \"%s\",\n\"nonce\": \"%d\"},\n\"application\": {\n\"data\": \"",
+ stoken, conn_ctx->nonce);
+ gss_log(APLOG_MARK, APLOG_DEBUG, 0, r, "gssweb_authenticate_filter: Sending (%d bytes): %s", strlen(data), data);
+
+ bkt_out = apr_bucket_heap_create(data, strlen(data), apr_bucket_free,
+ c->bucket_alloc);
+ APR_BRIGADE_INSERT_TAIL(brig_out, bkt_out);
+ if (0 != (ret = ap_pass_brigade(f->next, brig_out))) {
+ apr_brigade_cleanup(brig_in);
+ apr_brigade_cleanup(brig_out);
+ return ret;
}
- ret = gss_authenticate(r, conf, conn_ctx,
- auth_line, &negotiate_ret_value);
- if (ret == HTTP_UNAUTHORIZED || ret == OK) {
- /* LOG?? */
- set_http_headers(r, conf, negotiate_ret_value);
+ conn_ctx->filter_stat = GSS_FILT_INPROGRESS;
+ }
+
+ /* Loop through the app data buckets, escaping and sending each one */
+ for (bkt_in = APR_BRIGADE_FIRST(brig_in);
+ bkt_in != APR_BRIGADE_SENTINEL(brig_in);
+ bkt_in = APR_BUCKET_NEXT(bkt_in))
+ {
+ if (NULL == (brig_out = apr_brigade_create(r->pool, c->bucket_alloc))) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r, "gssweb_authenticate_filter: Unable to allocate brigade (loop)");
+ conn_ctx->filter_stat = GSS_FILT_ERROR;
+ apr_brigade_cleanup(brig_in);
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+
+ /* if this is an EOS, send the JSON closing block */
+ if(APR_BUCKET_IS_EOS(bkt_in))
+ {
+ /* create and add the JSON closing block */
+
+ if (NULL == (data = apr_bucket_alloc(1024, c->bucket_alloc))) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r, "gssweb_authenticate_filter: Unable to allocate space for closing JSON block");
+ apr_brigade_cleanup(brig_in);
+ apr_brigade_cleanup(brig_out);
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+
+ snprintf((char *)data, 1024, "\",\n\"content-type\": \"%s\",\n\"content-length\": \"%s\"\n}\n}", c_type, c_len);
+ gss_log(APLOG_MARK, APLOG_DEBUG, 0, r, "gssweb_authenticate_filter: Sending (%d bytes) %s", strlen(data), data);
+
+ bkt_out = apr_bucket_heap_create(data, strlen(data), apr_bucket_free,
+ c->bucket_alloc);
+ APR_BRIGADE_INSERT_TAIL(brig_out, bkt_out);
+
+ /* Indicate that the next filter call is a new response */
+ conn_ctx->filter_stat = GSS_FILT_NEW;
+
+ /* set EOS in the outbound brigade */
+ bkt_eos = apr_bucket_eos_create(c->bucket_alloc);
+ APR_BRIGADE_INSERT_TAIL (brig_out, bkt_eos);
+
+ /* set application type to 'application/json' */
+ apr_table_set(r->headers_out, "Content-Type", "application/json");
+
+ /* clear content-length and MD5 checksum */
+ apr_table_unset(r->headers_out, "Content-Length");
+ apr_table_unset(r->headers_out, "Content-MD5");
+
+ /* pass the brigade */
+ gss_log(APLOG_MARK, APLOG_DEBUG, 0, r, "gssweb_authenticate_filter: Sending: EOS");
+ if (0 != (ret = ap_pass_brigade(f->next, brig_out))) {
+ conn_ctx->filter_stat = GSS_FILT_ERROR;
+ apr_brigade_cleanup(brig_in);
+ apr_brigade_cleanup(brig_out);
+ return ret;
+ }
+ break;
+ }
+
+ /* Read application data from each input bucket */
+ apr_bucket_read(bkt_in, &data, &len, APR_BLOCK_READ);
+
+ /* Base64 encode the data (if any) */
+ if (0 != len) {
+ enc_len = apr_base64_encode_len(len);
+ if (NULL == (buf = apr_bucket_alloc(enc_len, c->bucket_alloc))) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r, "gssweb_authenticate_filter: Unable to allocate space for encoded application data");
+ apr_brigade_cleanup(brig_in);
+ apr_brigade_cleanup(brig_out);
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+ enc_len = apr_base64_encode_binary(buf, data, len);
+
+ /* Put the data in a bucket and add it to the the output brigade */
+ bkt_out = apr_bucket_heap_create(buf, enc_len-1, apr_bucket_free, c->bucket_alloc);
+ buf[enc_len] = '\0';
+ gss_log(APLOG_MARK, APLOG_DEBUG, 0, r, "gssweb_authenticate_filter: Sending (%d bytes)", enc_len);
+ APR_BRIGADE_INSERT_TAIL(brig_out, bkt_out);
+
+ /* Send the output brigade */
+ if (OK != (ret = ap_pass_brigade(f->next, brig_out))) {
+ apr_brigade_cleanup(brig_in);
+ apr_brigade_cleanup(brig_out);
+ return ret;
+ }
+ }
}
- if (ret == OK) {
- r->user = apr_pstrdup(r->pool, conn_ctx->user);
- r->ap_auth_type = "Negotiate";
+ /* Make sure we don't see the same data again */
+ apr_brigade_cleanup(brig_in);
+ return OK;
+}
+
+/* gssweb_add_filter() -- Hook to add our output filter to the request
+ * (r). Called for all error responses through the
+ * gssweb_insert_error_filter hook.
+ */
+static void
+gssweb_add_filter(request_rec *r)
+{
+ gss_conn_ctx conn_ctx = NULL;
+
+ /* Get the context for this request, if any */
+ conn_ctx = gss_retrieve_conn_ctx(r);
+
+ /* Add the output filter */
+ ap_add_output_filter("gssweb_auth_filter", (void *)conn_ctx, r, r->connection);
+ return;
+}
+
+/* gssweb_authenticate_user() -- Hook to perform actual user
+ * authentication. Will be called once for each round trip in the GSS
+ * authentication loop. Reads the tokend from the request, calls
+ * gss_accept_sec_context(), and stores the output token and context
+ * in the user data areas. Adds output filter to send the GSS
+ * output token back to the client.
+ */
+static int
+gssweb_authenticate_user(request_rec *r)
+{
+ const char *auth_line = NULL;
+ char *auth_type = NULL;
+ char *negotiate_ret_value = NULL;
+ gss_conn_ctx conn_ctx = NULL;
+ int ret;
+ OM_uint32 major_status, minor_status, minor_status2;
+ gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
+ gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
+ gss_name_t client_name = GSS_C_NO_NAME;
+ gss_cred_id_t delegated_cred = GSS_C_NO_CREDENTIAL;
+ OM_uint32 ret_flags = 0;
+ unsigned int nonce;
+ int release_output_token = 1;
+ gss_auth_config *conf = NULL;
+
+ gss_log(APLOG_MARK, APLOG_DEBUG, 0, r, "Entering GSSWeb authentication");
+
+ /* Get the module configuration */
+ conf = (gss_auth_config *) ap_get_module_config(r->per_dir_config,
+ &auth_gssweb_module);
+
+ /* Check if this is for our auth type */
+ auth_type = (char *)ap_auth_type(r);
+ if (auth_type == NULL || strcasecmp(auth_type, "GSSWeb") != 0) {
+ gss_log(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "gssweb_authenticate_user: AuthType '%s' is not GSSWeb, bailing out",
+ (auth_type) ? auth_type : "(NULL)");
+ ret = DECLINED;
+ goto end;
+ }
+
+ /* Retrieve the existing context (if any), or create one */
+ if ((NULL == (conn_ctx = gss_retrieve_conn_ctx(r))) &&
+ (NULL == (conn_ctx = gss_create_conn_ctx(r, conf)))) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r, "gssweb_authenticate_user: Unable to find or create context");
+ }
+
+ /* Read the token and nonce from the POST */
+ if (0 != gssweb_get_post_data(r, &nonce, &input_token)) {
+ /* If we get spurious msg on an established session, say OK again */
+ if (GSS_CTX_ESTABLISHED == conn_ctx->state)
+ ret = OK;
+ /* ...otherwise, if we are in progress, return HTTP_UNAUTHORIZED */
+ if (GSS_CTX_IN_PROGRESS == conn_ctx->state)
+ ret = HTTP_UNAUTHORIZED;
+ /* If this would start a new session, free the context and return DECLINED */
+ else {
+ gss_cleanup_conn_ctx(conn_ctx);
+ ret = DECLINED;
+ }
+ goto end;
+ }
+ gss_log(APLOG_MARK, APLOG_DEBUG, 0, r, "gssweb_authenticate_user: GSSWeb nonce value = %u.", nonce);
+
+ /* If the nonce does not match, release old context and create new */
+ if ((0 != conn_ctx->nonce) && (conn_ctx->nonce != nonce)) {
+ gss_log(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "gssweb_authenticate_user: Nonce in context (%d) does not match nonce in input (%d), new request", conn_ctx->nonce, nonce);
+ gss_cleanup_conn_ctx(conn_ctx);
+ if (NULL == (conn_ctx = gss_create_conn_ctx (r, conf))) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r, "gssweb_authenticate_user: Failed to create GSS context");
+ ret = HTTP_INTERNAL_SERVER_ERROR;
+ goto end;
}
+ }
+
+ /* If the output filter reported an internal server error, return it */
+ if (GSS_FILT_ERROR == conn_ctx->filter_stat) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r,
+ "gssweb_authenticate_user: Output filter returned error, reporting.");
+ ret = HTTP_INTERNAL_SERVER_ERROR;
+ goto end;
+ }
- /* debug LOG ??? */
+ /* Add the output filter to this request (for non-error returns) */
+ ap_add_output_filter("gssweb_auth_filter", (void *)conn_ctx, r, r->connection);
- return ret;
+ /* Call gss_accept_sec_context */
+ major_status = gss_accept_sec_context(&minor_status,
+ &conn_ctx->context,
+ conn_ctx->server_creds,
+ &input_token,
+ GSS_C_NO_CHANNEL_BINDINGS,
+ NULL,
+ NULL,
+ &output_token,
+ &ret_flags,
+ NULL,
+ &delegated_cred);
+ gss_log(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "gssweb_authenticate_user: Client %s us their credential",
+ (ret_flags & GSS_C_DELEG_FLAG) ? "delegated" : "didn't delegate");
+
+ if (GSS_ERROR(major_status)) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r,
+ "%s", get_gss_error(r, major_status, minor_status,
+ "gssweb_authenticate_user: Failed to establish authentication"));
+ conn_ctx->state = GSS_CTX_FAILED;
+ goto end;
+ }
+
+ /* If there was no token returned, clear token from context and exit */
+ if (0 == output_token.length) {
+ gss_log(APLOG_MARK, APLOG_ERR, 0, r, "gssweb_authenticate_user: No output token");
+ gss_delete_sec_context(&minor_status, &conn_ctx->context, GSS_C_NO_BUFFER);
+ conn_ctx->context = GSS_C_NO_CONTEXT;
+ conn_ctx->state = GSS_CTX_FAILED;
+ if (0 != conn_ctx->output_token.length)
+ gss_release_buffer(&minor_status, &(conn_ctx->output_token));
+ conn_ctx->output_token.length = 0;
+ ret = HTTP_UNAUTHORIZED;
+ goto end;
+ }
+
+ /* Store the nonce & ouput token in the stored context */
+ conn_ctx->nonce = nonce;
+ conn_ctx->output_token = output_token;
+ release_output_token = 0;
+
+ /* If we aren't done yet, go around again */
+ if (major_status & GSS_S_CONTINUE_NEEDED) {
+ gss_log(APLOG_MARK, APLOG_DEBUG, 0, r, "gssweb_authenticate_user: Accept sec context complete, continue needed");
+ conn_ctx->state = GSS_CTX_IN_PROGRESS;
+ ret = HTTP_UNAUTHORIZED;
+ goto end;
+ }
+
+ gss_log(APLOG_MARK, APLOG_DEBUG, 0, r, "gssweb_authenticate_user: Authentication succeeded!!");
+ conn_ctx->state = GSS_CTX_ESTABLISHED;
+ r->user = apr_pstrdup(r->pool, conn_ctx->user);
+ r->ap_auth_type = "GSSWeb";
+ ret = OK;
+
+ end:
+ if (delegated_cred)
+ gss_release_cred(&minor_status, &delegated_cred);
+
+ if ((release_output_token) && (output_token.length))
+ gss_release_buffer(&minor_status, &output_token);
+
+ if (client_name != GSS_C_NO_NAME)
+ gss_release_name(&minor_status, &client_name);
+
+ return ret;
}
static void
gssweb_register_hooks(apr_pool_t *p)
{
- ap_hook_check_user_id(gssweb_authenticate_user, NULL, NULL, APR_HOOK_MIDDLE);
+ /* register the gssweb output filter */
+ ap_register_output_filter("gssweb_auth_filter", gssweb_authenticate_filter, NULL, AP_FTYPE_RESOURCE);
+
+ /* register hooks */
+ ap_hook_check_user_id(gssweb_authenticate_user, NULL, NULL, APR_HOOK_MIDDLE);
+ ap_hook_insert_error_filter(gssweb_add_filter, NULL, NULL, APR_HOOK_MIDDLE);
}
module AP_MODULE_DECLARE_DATA auth_gssweb_module = {
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