227 lines
7.5 KiB
C
227 lines
7.5 KiB
C
/* Copyright 2009 Justin Erenkrantz and Greg Stein
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "serf.h"
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#include "serf_private.h"
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#include "auth_spnego.h"
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#ifdef SERF_USE_GSSAPI
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#include <apr_strings.h>
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#include <gssapi/gssapi.h>
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/* This module can support all authentication mechanisms as provided by
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the GSS-API implementation, but for now it only supports SPNEGO for
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Negotiate.
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SPNEGO can delegate authentication to Kerberos if supported by the
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host. */
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#ifndef GSS_SPNEGO_MECHANISM
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static gss_OID_desc spnego_mech_oid = { 6, "\x2b\x06\x01\x05\x05\x02" };
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#define GSS_SPNEGO_MECHANISM &spnego_mech_oid
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#endif
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struct serf__spnego_context_t
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{
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/* GSSAPI context */
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gss_ctx_id_t gss_ctx;
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/* Mechanism used to authenticate. */
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gss_OID gss_mech;
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};
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static void
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log_error(int verbose_flag, apr_socket_t *skt,
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serf__spnego_context_t *ctx,
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OM_uint32 err_maj_stat,
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OM_uint32 err_min_stat,
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const char *msg)
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{
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OM_uint32 maj_stat, min_stat;
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gss_buffer_desc stat_buff;
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OM_uint32 msg_ctx = 0;
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if (verbose_flag) {
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maj_stat = gss_display_status(&min_stat,
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err_maj_stat,
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GSS_C_GSS_CODE,
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ctx->gss_mech,
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&msg_ctx,
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&stat_buff);
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if (maj_stat == GSS_S_COMPLETE ||
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maj_stat == GSS_S_FAILURE) {
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maj_stat = gss_display_status(&min_stat,
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err_min_stat,
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GSS_C_MECH_CODE,
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ctx->gss_mech,
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&msg_ctx,
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&stat_buff);
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}
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serf__log_skt(verbose_flag, __FILE__, skt,
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"%s (%x,%d): %s\n", msg,
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err_maj_stat, err_min_stat, stat_buff.value);
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}
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}
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/* Cleans the GSS context object, when the pool used to create it gets
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cleared or destroyed. */
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static apr_status_t
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cleanup_ctx(void *data)
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{
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serf__spnego_context_t *ctx = data;
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if (ctx->gss_ctx != GSS_C_NO_CONTEXT) {
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OM_uint32 gss_min_stat, gss_maj_stat;
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gss_maj_stat = gss_delete_sec_context(&gss_min_stat, &ctx->gss_ctx,
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GSS_C_NO_BUFFER);
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if(GSS_ERROR(gss_maj_stat)) {
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log_error(AUTH_VERBOSE, NULL, ctx,
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gss_maj_stat, gss_min_stat,
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"Error cleaning up GSS security context");
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return SERF_ERROR_AUTHN_FAILED;
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}
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}
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return APR_SUCCESS;
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}
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static apr_status_t
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cleanup_sec_buffer(void *data)
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{
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OM_uint32 min_stat;
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gss_buffer_desc *gss_buf = data;
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gss_release_buffer(&min_stat, gss_buf);
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return APR_SUCCESS;
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}
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apr_status_t
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serf__spnego_create_sec_context(serf__spnego_context_t **ctx_p,
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const serf__authn_scheme_t *scheme,
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apr_pool_t *result_pool,
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apr_pool_t *scratch_pool)
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{
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serf__spnego_context_t *ctx;
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ctx = apr_pcalloc(result_pool, sizeof(*ctx));
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ctx->gss_ctx = GSS_C_NO_CONTEXT;
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ctx->gss_mech = GSS_SPNEGO_MECHANISM;
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apr_pool_cleanup_register(result_pool, ctx,
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cleanup_ctx,
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apr_pool_cleanup_null);
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*ctx_p = ctx;
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return APR_SUCCESS;
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}
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apr_status_t
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serf__spnego_reset_sec_context(serf__spnego_context_t *ctx)
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{
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OM_uint32 dummy_stat;
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if (ctx->gss_ctx)
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(void)gss_delete_sec_context(&dummy_stat, &ctx->gss_ctx,
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GSS_C_NO_BUFFER);
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ctx->gss_ctx = GSS_C_NO_CONTEXT;
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return APR_SUCCESS;
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}
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apr_status_t
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serf__spnego_init_sec_context(serf_connection_t *conn,
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serf__spnego_context_t *ctx,
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const char *service,
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const char *hostname,
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serf__spnego_buffer_t *input_buf,
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serf__spnego_buffer_t *output_buf,
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apr_pool_t *result_pool,
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apr_pool_t *scratch_pool
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)
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{
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gss_buffer_desc gss_input_buf = GSS_C_EMPTY_BUFFER;
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gss_buffer_desc *gss_output_buf_p;
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OM_uint32 gss_min_stat, gss_maj_stat;
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gss_name_t host_gss_name;
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gss_buffer_desc bufdesc;
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gss_OID dummy; /* unused */
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/* Get the name for the HTTP service at the target host. */
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/* TODO: should be shared between multiple requests. */
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bufdesc.value = apr_pstrcat(scratch_pool, service, "@", hostname, NULL);
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bufdesc.length = strlen(bufdesc.value);
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serf__log_skt(AUTH_VERBOSE, __FILE__, conn->skt,
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"Get principal for %s\n", bufdesc.value);
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gss_maj_stat = gss_import_name (&gss_min_stat, &bufdesc,
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GSS_C_NT_HOSTBASED_SERVICE,
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&host_gss_name);
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if(GSS_ERROR(gss_maj_stat)) {
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log_error(AUTH_VERBOSE, conn->skt, ctx,
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gss_maj_stat, gss_min_stat,
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"Error converting principal name to GSS internal format ");
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return SERF_ERROR_AUTHN_FAILED;
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}
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/* If the server sent us a token, pass it to gss_init_sec_token for
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validation. */
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gss_input_buf.value = input_buf->value;
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gss_input_buf.length = input_buf->length;
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gss_output_buf_p = apr_pcalloc(result_pool, sizeof(*gss_output_buf_p));
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/* Establish a security context to the server. */
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gss_maj_stat = gss_init_sec_context
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(&gss_min_stat, /* minor_status */
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GSS_C_NO_CREDENTIAL, /* XXXXX claimant_cred_handle */
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&ctx->gss_ctx, /* gssapi context handle */
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host_gss_name, /* HTTP@server name */
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ctx->gss_mech, /* mech_type (SPNEGO) */
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GSS_C_MUTUAL_FLAG, /* ensure the peer authenticates itself */
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0, /* default validity period */
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GSS_C_NO_CHANNEL_BINDINGS, /* do not use channel bindings */
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&gss_input_buf, /* server token, initially empty */
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&dummy, /* actual mech type */
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gss_output_buf_p, /* output_token */
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NULL, /* ret_flags */
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NULL /* not interested in remaining validity */
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);
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apr_pool_cleanup_register(result_pool, gss_output_buf_p,
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cleanup_sec_buffer,
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apr_pool_cleanup_null);
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output_buf->value = gss_output_buf_p->value;
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output_buf->length = gss_output_buf_p->length;
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switch(gss_maj_stat) {
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case GSS_S_COMPLETE:
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return APR_SUCCESS;
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case GSS_S_CONTINUE_NEEDED:
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return APR_EAGAIN;
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default:
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log_error(AUTH_VERBOSE, conn->skt, ctx,
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gss_maj_stat, gss_min_stat,
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"Error during Kerberos handshake");
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return SERF_ERROR_AUTHN_FAILED;
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}
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}
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#endif /* SERF_USE_GSSAPI */
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