summaryrefslogtreecommitdiffstats
path: root/lib/dns/spnego.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/dns/spnego.c')
-rw-r--r--lib/dns/spnego.c1792
1 files changed, 1792 insertions, 0 deletions
diff --git a/lib/dns/spnego.c b/lib/dns/spnego.c
new file mode 100644
index 0000000..a9dbbbd
--- /dev/null
+++ b/lib/dns/spnego.c
@@ -0,0 +1,1792 @@
+/*
+ * Copyright (C) 2006-2008 Internet Systems Consortium, Inc. ("ISC")
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/* $Id: spnego.c,v 1.8 2008/04/03 06:09:04 tbox Exp $ */
+
+/*! \file
+ * \brief
+ * Portable SPNEGO implementation.
+ *
+ * This is part of a portable implementation of the SPNEGO protocol
+ * (RFCs 2478 and 4178). This implementation uses the RFC 4178 ASN.1
+ * module but is not a full implementation of the RFC 4178 protocol;
+ * at the moment, we only support GSS-TSIG with Kerberos
+ * authentication, so we only need enough of the SPNEGO protocol to
+ * support that.
+ *
+ * The files that make up this portable SPNEGO implementation are:
+ * \li spnego.c (this file)
+ * \li spnego.h (API SPNEGO exports to the rest of lib/dns)
+ * \li spnego.asn1 (SPNEGO ASN.1 module)
+ * \li spnego_asn1.c (routines generated from spngo.asn1)
+ * \li spnego_asn1.pl (perl script to generate spnego_asn1.c)
+ *
+ * Everything but the functions exported in spnego.h is static, to
+ * avoid possible conflicts with other libraries (particularly Heimdal,
+ * since much of this code comes from Heimdal by way of mod_auth_kerb).
+ *
+ * spnego_asn1.c is shipped as part of lib/dns because generating it
+ * requires both Perl and the Heimdal ASN.1 compiler. See
+ * spnego_asn1.pl for further details. We've tried to eliminate all
+ * compiler warnings from the generated code, but you may see a few
+ * when using a compiler version we haven't tested yet.
+ */
+
+/*
+ * Portions of this code were derived from mod_auth_kerb and Heimdal.
+ * These packages are available from:
+ *
+ * http://modauthkerb.sourceforge.net/
+ * http://www.pdc.kth.se/heimdal/
+ *
+ * and were released under the following licenses:
+ *
+ * ----------------------------------------------------------------
+ *
+ * Copyright (c) 2004 Masarykova universita
+ * (Masaryk University, Brno, Czech Republic)
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * 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.
+ *
+ * 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 the University 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.
+ *
+ * ----------------------------------------------------------------
+ *
+ * Copyright (c) 1997 - 2003 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * 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.
+ *
+ * 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 the Institute 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 INSTITUTE 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 INSTITUTE 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.
+ */
+
+/*
+ * XXXSRA We should omit this file entirely in Makefile.in via autoconf,
+ * but this will keep it from generating errors until that's written.
+ */
+
+#ifdef GSSAPI
+
+/*
+ * XXXSRA Some of the following files are almost certainly unnecessary,
+ * but using this list (borrowed from gssapictx.c) gets rid of some
+ * whacky compilation errors when building with MSVC and should be
+ * harmless in any case.
+ */
+
+#include <config.h>
+
+#include <stdlib.h>
+#include <errno.h>
+
+#include <isc/buffer.h>
+#include <isc/dir.h>
+#include <isc/entropy.h>
+#include <isc/lex.h>
+#include <isc/mem.h>
+#include <isc/once.h>
+#include <isc/random.h>
+#include <isc/string.h>
+#include <isc/time.h>
+#include <isc/util.h>
+
+#include <dns/fixedname.h>
+#include <dns/name.h>
+#include <dns/rdata.h>
+#include <dns/rdataclass.h>
+#include <dns/result.h>
+#include <dns/types.h>
+#include <dns/keyvalues.h>
+#include <dns/log.h>
+
+#include <dst/gssapi.h>
+#include <dst/result.h>
+
+#include "dst_internal.h"
+
+/*
+ * The API we export
+ */
+#include "spnego.h"
+
+/* asn1_err.h */
+/* Generated from ../../../lib/asn1/asn1_err.et */
+
+typedef enum asn1_error_number {
+ ASN1_BAD_TIMEFORMAT = 1859794432,
+ ASN1_MISSING_FIELD = 1859794433,
+ ASN1_MISPLACED_FIELD = 1859794434,
+ ASN1_TYPE_MISMATCH = 1859794435,
+ ASN1_OVERFLOW = 1859794436,
+ ASN1_OVERRUN = 1859794437,
+ ASN1_BAD_ID = 1859794438,
+ ASN1_BAD_LENGTH = 1859794439,
+ ASN1_BAD_FORMAT = 1859794440,
+ ASN1_PARSE_ERROR = 1859794441
+} asn1_error_number;
+
+#define ERROR_TABLE_BASE_asn1 1859794432
+
+#define __asn1_common_definitions__
+
+typedef struct octet_string {
+ size_t length;
+ void *data;
+} octet_string;
+
+typedef char *general_string;
+
+typedef char *utf8_string;
+
+typedef struct oid {
+ size_t length;
+ unsigned *components;
+} oid;
+
+/* der.h */
+
+typedef enum {
+ ASN1_C_UNIV = 0, ASN1_C_APPL = 1,
+ ASN1_C_CONTEXT = 2, ASN1_C_PRIVATE = 3
+} Der_class;
+
+typedef enum {
+ PRIM = 0, CONS = 1
+} Der_type;
+
+/* Universal tags */
+
+enum {
+ UT_Boolean = 1,
+ UT_Integer = 2,
+ UT_BitString = 3,
+ UT_OctetString = 4,
+ UT_Null = 5,
+ UT_OID = 6,
+ UT_Enumerated = 10,
+ UT_Sequence = 16,
+ UT_Set = 17,
+ UT_PrintableString = 19,
+ UT_IA5String = 22,
+ UT_UTCTime = 23,
+ UT_GeneralizedTime = 24,
+ UT_VisibleString = 26,
+ UT_GeneralString = 27
+};
+
+#define ASN1_INDEFINITE 0xdce0deed
+
+static int
+der_get_length(const unsigned char *p, size_t len,
+ size_t * val, size_t * size);
+
+static int
+der_get_octet_string(const unsigned char *p, size_t len,
+ octet_string * data, size_t * size);
+static int
+der_get_oid(const unsigned char *p, size_t len,
+ oid * data, size_t * size);
+static int
+der_get_tag(const unsigned char *p, size_t len,
+ Der_class * class, Der_type * type,
+ int *tag, size_t * size);
+
+static int
+der_match_tag(const unsigned char *p, size_t len,
+ Der_class class, Der_type type,
+ int tag, size_t * size);
+static int
+der_match_tag_and_length(const unsigned char *p, size_t len,
+ Der_class class, Der_type type, int tag,
+ size_t * length_ret, size_t * size);
+
+static int
+decode_oid(const unsigned char *p, size_t len,
+ oid * k, size_t * size);
+
+static int
+decode_enumerated(const unsigned char *p, size_t len,
+ unsigned *num, size_t *size);
+
+static int
+decode_octet_string(const unsigned char *, size_t, octet_string *, size_t *);
+
+static int
+der_put_int(unsigned char *p, size_t len, int val, size_t *);
+
+static int
+der_put_length(unsigned char *p, size_t len, size_t val, size_t *);
+
+static int
+der_put_octet_string(unsigned char *p, size_t len,
+ const octet_string * data, size_t *);
+static int
+der_put_oid(unsigned char *p, size_t len,
+ const oid * data, size_t * size);
+static int
+der_put_tag(unsigned char *p, size_t len, Der_class class, Der_type type,
+ int tag, size_t *);
+static int
+der_put_length_and_tag(unsigned char *, size_t, size_t,
+ Der_class, Der_type, int, size_t *);
+
+static int
+encode_enumerated(unsigned char *p, size_t len,
+ const unsigned *data, size_t *);
+
+static int
+encode_octet_string(unsigned char *p, size_t len,
+ const octet_string * k, size_t *);
+static int
+encode_oid(unsigned char *p, size_t len,
+ const oid * k, size_t *);
+
+static void
+free_octet_string(octet_string * k);
+
+static void
+free_oid (oid * k);
+
+static size_t
+length_len(size_t len);
+
+static int
+fix_dce(size_t reallen, size_t * len);
+
+/*
+ * Include stuff generated by the ASN.1 compiler.
+ */
+
+#include "spnego_asn1.c"
+
+static unsigned char gss_krb5_mech_oid_bytes[] = {
+ 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x12, 0x01, 0x02, 0x02
+};
+
+static gss_OID_desc gss_krb5_mech_oid_desc = {
+ sizeof(gss_krb5_mech_oid_bytes),
+ gss_krb5_mech_oid_bytes
+};
+
+static gss_OID GSS_KRB5_MECH = &gss_krb5_mech_oid_desc;
+
+static unsigned char gss_mskrb5_mech_oid_bytes[] = {
+ 0x2a, 0x86, 0x48, 0x82, 0xf7, 0x12, 0x01, 0x02, 0x02
+};
+
+static gss_OID_desc gss_mskrb5_mech_oid_desc = {
+ sizeof(gss_mskrb5_mech_oid_bytes),
+ gss_mskrb5_mech_oid_bytes
+};
+
+static gss_OID GSS_MSKRB5_MECH = &gss_mskrb5_mech_oid_desc;
+
+static unsigned char gss_spnego_mech_oid_bytes[] = {
+ 0x2b, 0x06, 0x01, 0x05, 0x05, 0x02
+};
+
+static gss_OID_desc gss_spnego_mech_oid_desc = {
+ sizeof(gss_spnego_mech_oid_bytes),
+ gss_spnego_mech_oid_bytes
+};
+
+static gss_OID GSS_SPNEGO_MECH = &gss_spnego_mech_oid_desc;
+
+/* spnegokrb5_locl.h */
+
+static OM_uint32
+gssapi_spnego_encapsulate(OM_uint32 *,
+ unsigned char *,
+ size_t,
+ gss_buffer_t,
+ const gss_OID);
+
+static OM_uint32
+gssapi_spnego_decapsulate(OM_uint32 *,
+ gss_buffer_t,
+ unsigned char **,
+ size_t *,
+ const gss_OID);
+
+/* mod_auth_kerb.c */
+
+static int
+cmp_gss_type(gss_buffer_t token, gss_OID oid)
+{
+ unsigned char *p;
+ size_t len;
+
+ if (token->length == 0)
+ return (GSS_S_DEFECTIVE_TOKEN);
+
+ p = token->value;
+ if (*p++ != 0x60)
+ return (GSS_S_DEFECTIVE_TOKEN);
+ len = *p++;
+ if (len & 0x80) {
+ if ((len & 0x7f) > 4)
+ return (GSS_S_DEFECTIVE_TOKEN);
+ p += len & 0x7f;
+ }
+ if (*p++ != 0x06)
+ return (GSS_S_DEFECTIVE_TOKEN);
+
+ if (((OM_uint32) *p++) != oid->length)
+ return (GSS_S_DEFECTIVE_TOKEN);
+
+ return (memcmp(p, oid->elements, oid->length));
+}
+
+/* accept_sec_context.c */
+/*
+ * SPNEGO wrapper for Kerberos5 GSS-API kouril@ics.muni.cz, 2003 (mostly
+ * based on Heimdal code)
+ */
+
+static OM_uint32
+code_NegTokenArg(OM_uint32 * minor_status,
+ const NegTokenResp * resp,
+ unsigned char **outbuf,
+ size_t * outbuf_size)
+{
+ OM_uint32 ret;
+ u_char *buf;
+ size_t buf_size, buf_len;
+
+ buf_size = 1024;
+ buf = malloc(buf_size);
+ if (buf == NULL) {
+ *minor_status = ENOMEM;
+ return (GSS_S_FAILURE);
+ }
+ do {
+ ret = encode_NegTokenResp(buf + buf_size - 1,
+ buf_size,
+ resp, &buf_len);
+ if (ret == 0) {
+ size_t tmp;
+
+ ret = der_put_length_and_tag(buf + buf_size - buf_len - 1,
+ buf_size - buf_len,
+ buf_len,
+ ASN1_C_CONTEXT,
+ CONS,
+ 1,
+ &tmp);
+ if (ret == 0)
+ buf_len += tmp;
+ }
+ if (ret) {
+ if (ret == ASN1_OVERFLOW) {
+ u_char *tmp;
+
+ buf_size *= 2;
+ tmp = realloc(buf, buf_size);
+ if (tmp == NULL) {
+ *minor_status = ENOMEM;
+ free(buf);
+ return (GSS_S_FAILURE);
+ }
+ buf = tmp;
+ } else {
+ *minor_status = ret;
+ free(buf);
+ return (GSS_S_FAILURE);
+ }
+ }
+ } while (ret == ASN1_OVERFLOW);
+
+ *outbuf = malloc(buf_len);
+ if (*outbuf == NULL) {
+ *minor_status = ENOMEM;
+ free(buf);
+ return (GSS_S_FAILURE);
+ }
+ memcpy(*outbuf, buf + buf_size - buf_len, buf_len);
+ *outbuf_size = buf_len;
+
+ free(buf);
+
+ return (GSS_S_COMPLETE);
+}
+
+static OM_uint32
+send_reject(OM_uint32 * minor_status,
+ gss_buffer_t output_token)
+{
+ NegTokenResp resp;
+ OM_uint32 ret;
+
+ resp.negState = malloc(sizeof(*resp.negState));
+ if (resp.negState == NULL) {
+ *minor_status = ENOMEM;
+ return (GSS_S_FAILURE);
+ }
+ *(resp.negState) = reject;
+
+ resp.supportedMech = NULL;
+ resp.responseToken = NULL;
+ resp.mechListMIC = NULL;
+
+ ret = code_NegTokenArg(minor_status, &resp,
+ (unsigned char **)&output_token->value,
+ &output_token->length);
+ free_NegTokenResp(&resp);
+ if (ret)
+ return (ret);
+
+ return (GSS_S_BAD_MECH);
+}
+
+static OM_uint32
+send_accept(OM_uint32 * minor_status,
+ gss_buffer_t output_token,
+ gss_buffer_t mech_token,
+ const gss_OID pref)
+{
+ NegTokenResp resp;
+ OM_uint32 ret;
+
+ memset(&resp, 0, sizeof(resp));
+ resp.negState = malloc(sizeof(*resp.negState));
+ if (resp.negState == NULL) {
+ *minor_status = ENOMEM;
+ return (GSS_S_FAILURE);
+ }
+ *(resp.negState) = accept_completed;
+
+ resp.supportedMech = malloc(sizeof(*resp.supportedMech));
+ if (resp.supportedMech == NULL) {
+ free_NegTokenResp(&resp);
+ *minor_status = ENOMEM;
+ return (GSS_S_FAILURE);
+ }
+ ret = der_get_oid(pref->elements,
+ pref->length,
+ resp.supportedMech,
+ NULL);
+ if (ret) {
+ free_NegTokenResp(&resp);
+ *minor_status = ENOMEM;
+ return (GSS_S_FAILURE);
+ }
+ if (mech_token != NULL && mech_token->length != 0) {
+ resp.responseToken = malloc(sizeof(*resp.responseToken));
+ if (resp.responseToken == NULL) {
+ free_NegTokenResp(&resp);
+ *minor_status = ENOMEM;
+ return (GSS_S_FAILURE);
+ }
+ resp.responseToken->length = mech_token->length;
+ resp.responseToken->data = mech_token->value;
+ }
+
+ ret = code_NegTokenArg(minor_status, &resp,
+ (unsigned char **)&output_token->value,
+ &output_token->length);
+ if (resp.responseToken != NULL) {
+ free(resp.responseToken);
+ resp.responseToken = NULL;
+ }
+ free_NegTokenResp(&resp);
+ if (ret)
+ return (ret);
+
+ return (GSS_S_COMPLETE);
+}
+
+OM_uint32
+gss_accept_sec_context_spnego(OM_uint32 *minor_status,
+ gss_ctx_id_t *context_handle,
+ const gss_cred_id_t acceptor_cred_handle,
+ const gss_buffer_t input_token_buffer,
+ const gss_channel_bindings_t input_chan_bindings,
+ gss_name_t *src_name,
+ gss_OID *mech_type,
+ gss_buffer_t output_token,
+ OM_uint32 *ret_flags,
+ OM_uint32 *time_rec,
+ gss_cred_id_t *delegated_cred_handle)
+{
+ NegTokenInit init_token;
+ OM_uint32 major_status;
+ OM_uint32 minor_status2;
+ gss_buffer_desc ibuf, obuf;
+ gss_buffer_t ot = NULL;
+ gss_OID pref = GSS_KRB5_MECH;
+ unsigned char *buf;
+ size_t buf_size;
+ size_t len, taglen, ni_len;
+ int found = 0;
+ int ret;
+ unsigned i;
+
+ /*
+ * Before doing anything else, see whether this is a SPNEGO
+ * PDU. If not, dispatch to the GSSAPI library and get out.
+ */
+
+ if (cmp_gss_type(input_token_buffer, GSS_SPNEGO_MECH))
+ return (gss_accept_sec_context(minor_status,
+ context_handle,
+ acceptor_cred_handle,
+ input_token_buffer,
+ input_chan_bindings,
+ src_name,
+ mech_type,
+ output_token,
+ ret_flags,
+ time_rec,
+ delegated_cred_handle));
+
+ /*
+ * If we get here, it's SPNEGO.
+ */
+
+ memset(&init_token, 0, sizeof(init_token));
+
+ ret = gssapi_spnego_decapsulate(minor_status, input_token_buffer,
+ &buf, &buf_size, GSS_SPNEGO_MECH);
+ if (ret)
+ return (ret);
+
+ ret = der_match_tag_and_length(buf, buf_size, ASN1_C_CONTEXT, CONS,
+ 0, &len, &taglen);
+ if (ret)
+ return (ret);
+
+ ret = decode_NegTokenInit(buf + taglen, len, &init_token, &ni_len);
+ if (ret) {
+ *minor_status = EINVAL; /* XXX */
+ return (GSS_S_DEFECTIVE_TOKEN);
+ }
+
+ for (i = 0; !found && i < init_token.mechTypes.len; ++i) {
+ char mechbuf[17];
+ size_t mech_len;
+
+ ret = der_put_oid(mechbuf + sizeof(mechbuf) - 1,
+ sizeof(mechbuf),
+ &init_token.mechTypes.val[i],
+ &mech_len);
+ if (ret)
+ return (GSS_S_DEFECTIVE_TOKEN);
+ if (mech_len == GSS_KRB5_MECH->length &&
+ memcmp(GSS_KRB5_MECH->elements,
+ mechbuf + sizeof(mechbuf) - mech_len,
+ mech_len) == 0) {
+ found = 1;
+ break;
+ }
+ if (mech_len == GSS_MSKRB5_MECH->length &&
+ memcmp(GSS_MSKRB5_MECH->elements,
+ mechbuf + sizeof(mechbuf) - mech_len,
+ mech_len) == 0) {
+ found = 1;
+ if (i == 0)
+ pref = GSS_MSKRB5_MECH;
+ break;
+ }
+ }
+
+ if (!found)
+ return (send_reject(minor_status, output_token));
+
+ if (i == 0 && init_token.mechToken != NULL) {
+ ibuf.length = init_token.mechToken->length;
+ ibuf.value = init_token.mechToken->data;
+
+ major_status = gss_accept_sec_context(minor_status,
+ context_handle,
+ acceptor_cred_handle,
+ &ibuf,
+ input_chan_bindings,
+ src_name,
+ mech_type,
+ &obuf,
+ ret_flags,
+ time_rec,
+ delegated_cred_handle);
+ if (GSS_ERROR(major_status)) {
+ send_reject(&minor_status2, output_token);
+ return (major_status);
+ }
+ ot = &obuf;
+ }
+ ret = send_accept(&minor_status2, output_token, ot, pref);
+ if (ot != NULL && ot->length != 0)
+ gss_release_buffer(&minor_status2, ot);
+
+ return (ret);
+}
+
+/* decapsulate.c */
+
+static OM_uint32
+gssapi_verify_mech_header(u_char ** str,
+ size_t total_len,
+ const gss_OID mech)
+{
+ size_t len, len_len, mech_len, foo;
+ int e;
+ u_char *p = *str;
+
+ if (total_len < 1)
+ return (GSS_S_DEFECTIVE_TOKEN);
+ if (*p++ != 0x60)
+ return (GSS_S_DEFECTIVE_TOKEN);
+ e = der_get_length(p, total_len - 1, &len, &len_len);
+ if (e || 1 + len_len + len != total_len)
+ return (GSS_S_DEFECTIVE_TOKEN);
+ p += len_len;
+ if (*p++ != 0x06)
+ return (GSS_S_DEFECTIVE_TOKEN);
+ e = der_get_length(p, total_len - 1 - len_len - 1,
+ &mech_len, &foo);
+ if (e)
+ return (GSS_S_DEFECTIVE_TOKEN);
+ p += foo;
+ if (mech_len != mech->length)
+ return (GSS_S_BAD_MECH);
+ if (memcmp(p, mech->elements, mech->length) != 0)
+ return (GSS_S_BAD_MECH);
+ p += mech_len;
+ *str = p;
+ return (GSS_S_COMPLETE);
+}
+
+/*
+ * Remove the GSS-API wrapping from `in_token' giving `buf and buf_size' Does
+ * not copy data, so just free `in_token'.
+ */
+
+static OM_uint32
+gssapi_spnego_decapsulate(OM_uint32 *minor_status,
+ gss_buffer_t input_token_buffer,
+ unsigned char **buf,
+ size_t *buf_len,
+ const gss_OID mech)
+{
+ u_char *p;
+ OM_uint32 ret;
+
+ p = input_token_buffer->value;
+ ret = gssapi_verify_mech_header(&p,
+ input_token_buffer->length,
+ mech);
+ if (ret) {
+ *minor_status = ret;
+ return (GSS_S_FAILURE);
+ }
+ *buf_len = input_token_buffer->length -
+ (p - (u_char *) input_token_buffer->value);
+ *buf = p;
+ return (GSS_S_COMPLETE);
+}
+
+/* der_free.c */
+
+static void
+free_octet_string(octet_string *k)
+{
+ free(k->data);
+ k->data = NULL;
+}
+
+static void
+free_oid(oid *k)
+{
+ free(k->components);
+ k->components = NULL;
+}
+
+/* der_get.c */
+
+/*
+ * All decoding functions take a pointer `p' to first position in which to
+ * read, from the left, `len' which means the maximum number of characters we
+ * are able to read, `ret' were the value will be returned and `size' where
+ * the number of used bytes is stored. Either 0 or an error code is returned.
+ */
+
+static int
+der_get_unsigned(const unsigned char *p, size_t len,
+ unsigned *ret, size_t *size)
+{
+ unsigned val = 0;
+ size_t oldlen = len;
+
+ while (len--)
+ val = val * 256 + *p++;
+ *ret = val;
+ if (size)
+ *size = oldlen;
+ return (0);
+}
+
+static int
+der_get_int(const unsigned char *p, size_t len,
+ int *ret, size_t *size)
+{
+ int val = 0;
+ size_t oldlen = len;
+
+ if (len > 0) {
+ val = (signed char)*p++;
+ while (--len)
+ val = val * 256 + *p++;
+ }
+ *ret = val;
+ if (size)
+ *size = oldlen;
+ return (0);
+}
+
+static int
+der_get_length(const unsigned char *p, size_t len,
+ size_t *val, size_t *size)
+{
+ size_t v;
+
+ if (len <= 0)
+ return (ASN1_OVERRUN);
+ --len;
+ v = *p++;
+ if (v < 128) {
+ *val = v;
+ if (size)
+ *size = 1;
+ } else {
+ int e;
+ size_t l;
+ unsigned tmp;
+
+ if (v == 0x80) {
+ *val = ASN1_INDEFINITE;
+ if (size)
+ *size = 1;
+ return (0);
+ }
+ v &= 0x7F;
+ if (len < v)
+ return (ASN1_OVERRUN);
+ e = der_get_unsigned(p, v, &tmp, &l);
+ if (e)
+ return (e);
+ *val = tmp;
+ if (size)
+ *size = l + 1;
+ }
+ return (0);
+}
+
+static int
+der_get_octet_string(const unsigned char *p, size_t len,
+ octet_string *data, size_t *size)
+{
+ data->length = len;
+ data->data = malloc(len);
+ if (data->data == NULL && data->length != 0)
+ return (ENOMEM);
+ memcpy(data->data, p, len);
+ if (size)
+ *size = len;
+ return (0);
+}
+
+static int
+der_get_oid(const unsigned char *p, size_t len,
+ oid *data, size_t *size)
+{
+ int n;
+ size_t oldlen = len;
+
+ if (len < 1)
+ return (ASN1_OVERRUN);
+
+ data->components = malloc(len * sizeof(*data->components));
+ if (data->components == NULL && len != 0)
+ return (ENOMEM);
+ data->components[0] = (*p) / 40;
+ data->components[1] = (*p) % 40;
+ --len;
+ ++p;
+ for (n = 2; len > 0; ++n) {
+ unsigned u = 0;
+
+ do {
+ --len;
+ u = u * 128 + (*p++ % 128);
+ } while (len > 0 && p[-1] & 0x80);
+ data->components[n] = u;
+ }
+ if (p[-1] & 0x80) {
+ free_oid(data);
+ return (ASN1_OVERRUN);
+ }
+ data->length = n;
+ if (size)
+ *size = oldlen;
+ return (0);
+}
+
+static int
+der_get_tag(const unsigned char *p, size_t len,
+ Der_class *class, Der_type *type,
+ int *tag, size_t *size)
+{
+ if (len < 1)
+ return (ASN1_OVERRUN);
+ *class = (Der_class) (((*p) >> 6) & 0x03);
+ *type = (Der_type) (((*p) >> 5) & 0x01);
+ *tag = (*p) & 0x1F;
+ if (size)
+ *size = 1;
+ return (0);
+}
+
+static int
+der_match_tag(const unsigned char *p, size_t len,
+ Der_class class, Der_type type,
+ int tag, size_t *size)
+{
+ size_t l;
+ Der_class thisclass;
+ Der_type thistype;
+ int thistag;
+ int e;
+
+ e = der_get_tag(p, len, &thisclass, &thistype, &thistag, &l);
+ if (e)
+ return (e);
+ if (class != thisclass || type != thistype)
+ return (ASN1_BAD_ID);
+ if (tag > thistag)
+ return (ASN1_MISPLACED_FIELD);
+ if (tag < thistag)
+ return (ASN1_MISSING_FIELD);
+ if (size)
+ *size = l;
+ return (0);
+}
+
+static int
+der_match_tag_and_length(const unsigned char *p, size_t len,
+ Der_class class, Der_type type, int tag,
+ size_t *length_ret, size_t *size)
+{
+ size_t l, ret = 0;
+ int e;
+
+ e = der_match_tag(p, len, class, type, tag, &l);
+ if (e)
+ return (e);
+ p += l;
+ len -= l;
+ ret += l;
+ e = der_get_length(p, len, length_ret, &l);
+ if (e)
+ return (e);
+ p += l;
+ len -= l;
+ ret += l;
+ if (size)
+ *size = ret;
+ return (0);
+}
+
+static int
+decode_enumerated(const unsigned char *p, size_t len,
+ unsigned *num, size_t *size)
+{
+ size_t ret = 0;
+ size_t l, reallen;
+ int e;
+
+ e = der_match_tag(p, len, ASN1_C_UNIV, PRIM, UT_Enumerated, &l);
+ if (e)
+ return (e);
+ p += l;
+ len -= l;
+ ret += l;
+ e = der_get_length(p, len, &reallen, &l);
+ if (e)
+ return (e);
+ p += l;
+ len -= l;
+ ret += l;
+ e = der_get_int(p, reallen, num, &l);
+ if (e)
+ return (e);
+ p += l;
+ len -= l;
+ ret += l;
+ if (size)
+ *size = ret;
+ return (0);
+}
+
+static int
+decode_octet_string(const unsigned char *p, size_t len,
+ octet_string *k, size_t *size)
+{
+ size_t ret = 0;
+ size_t l;
+ int e;
+ size_t slen;
+
+ e = der_match_tag(p, len, ASN1_C_UNIV, PRIM, UT_OctetString, &l);
+ if (e)
+ return (e);
+ p += l;
+ len -= l;
+ ret += l;
+
+ e = der_get_length(p, len, &slen, &l);
+ if (e)
+ return (e);
+ p += l;
+ len -= l;
+ ret += l;
+ if (len < slen)
+ return (ASN1_OVERRUN);
+
+ e = der_get_octet_string(p, slen, k, &l);
+ if (e)
+ return (e);
+ p += l;
+ len -= l;
+ ret += l;
+ if (size)
+ *size = ret;
+ return (0);
+}
+
+static int
+decode_oid(const unsigned char *p, size_t len,
+ oid *k, size_t *size)
+{
+ size_t ret = 0;
+ size_t l;
+ int e;
+ size_t slen;
+
+ e = der_match_tag(p, len, ASN1_C_UNIV, PRIM, UT_OID, &l);
+ if (e)
+ return (e);
+ p += l;
+ len -= l;
+ ret += l;
+
+ e = der_get_length(p, len, &slen, &l);
+ if (e)
+ return (e);
+ p += l;
+ len -= l;
+ ret += l;
+ if (len < slen)
+ return (ASN1_OVERRUN);
+
+ e = der_get_oid(p, slen, k, &l);
+ if (e)
+ return (e);
+ p += l;
+ len -= l;
+ ret += l;
+ if (size)
+ *size = ret;
+ return (0);
+}
+
+static int
+fix_dce(size_t reallen, size_t *len)
+{
+ if (reallen == ASN1_INDEFINITE)
+ return (1);
+ if (*len < reallen)
+ return (-1);
+ *len = reallen;
+ return (0);
+}
+
+/* der_length.c */
+
+static size_t
+len_unsigned(unsigned val)
+{
+ size_t ret = 0;
+
+ do {
+ ++ret;
+ val /= 256;
+ } while (val);
+ return (ret);
+}
+
+static size_t
+length_len(size_t len)
+{
+ if (len < 128)
+ return (1);
+ else
+ return (len_unsigned(len) + 1);
+}
+
+
+/* der_put.c */
+
+/*
+ * All encoding functions take a pointer `p' to first position in which to
+ * write, from the right, `len' which means the maximum number of characters
+ * we are able to write. The function returns the number of characters
+ * written in `size' (if non-NULL). The return value is 0 or an error.
+ */
+
+static int
+der_put_unsigned(unsigned char *p, size_t len, unsigned val, size_t *size)
+{
+ unsigned char *base = p;
+
+ if (val) {
+ while (len > 0 && val) {
+ *p-- = val % 256;
+ val /= 256;
+ --len;
+ }
+ if (val != 0)
+ return (ASN1_OVERFLOW);
+ else {
+ *size = base - p;
+ return (0);
+ }
+ } else if (len < 1)
+ return (ASN1_OVERFLOW);
+ else {
+ *p = 0;
+ *size = 1;
+ return (0);
+ }
+}
+
+static int
+der_put_int(unsigned char *p, size_t len, int val, size_t *size)
+{
+ unsigned char *base = p;
+
+ if (val >= 0) {
+ do {
+ if (len < 1)
+ return (ASN1_OVERFLOW);
+ *p-- = val % 256;
+ len--;
+ val /= 256;
+ } while (val);
+ if (p[1] >= 128) {
+ if (len < 1)
+ return (ASN1_OVERFLOW);
+ *p-- = 0;
+ len--;
+ }
+ } else {
+ val = ~val;
+ do {
+ if (len < 1)
+ return (ASN1_OVERFLOW);
+ *p-- = ~(val % 256);
+ len--;
+ val /= 256;
+ } while (val);
+ if (p[1] < 128) {
+ if (len < 1)
+ return (ASN1_OVERFLOW);
+ *p-- = 0xff;
+ len--;
+ }
+ }
+ *size = base - p;
+ return (0);
+}
+
+static int
+der_put_length(unsigned char *p, size_t len, size_t val, size_t *size)
+{
+ if (len < 1)
+ return (ASN1_OVERFLOW);
+ if (val < 128) {
+ *p = val;
+ *size = 1;
+ return (0);
+ } else {
+ size_t l;
+ int e;
+
+ e = der_put_unsigned(p, len - 1, val, &l);
+ if (e)
+ return (e);
+ p -= l;
+ *p = 0x80 | l;
+ *size = l + 1;
+ return (0);
+ }
+}
+
+static int
+der_put_octet_string(unsigned char *p, size_t len,
+ const octet_string *data, size_t *size)
+{
+ if (len < data->length)
+ return (ASN1_OVERFLOW);
+ p -= data->length;
+ len -= data->length;
+ memcpy(p + 1, data->data, data->length);
+ *size = data->length;
+ return (0);
+}
+
+static int
+der_put_oid(unsigned char *p, size_t len,
+ const oid *data, size_t *size)
+{
+ unsigned char *base = p;
+ int n;
+
+ for (n = data->length - 1; n >= 2; --n) {
+ unsigned u = data->components[n];
+
+ if (len < 1)
+ return (ASN1_OVERFLOW);
+ *p-- = u % 128;
+ u /= 128;
+ --len;
+ while (u > 0) {
+ if (len < 1)
+ return (ASN1_OVERFLOW);
+ *p-- = 128 + u % 128;
+ u /= 128;
+ --len;
+ }
+ }
+ if (len < 1)
+ return (ASN1_OVERFLOW);
+ *p-- = 40 * data->components[0] + data->components[1];
+ *size = base - p;
+ return (0);
+}
+
+static int
+der_put_tag(unsigned char *p, size_t len, Der_class class, Der_type type,
+ int tag, size_t *size)
+{
+ if (len < 1)
+ return (ASN1_OVERFLOW);
+ *p = (class << 6) | (type << 5) | tag; /* XXX */
+ *size = 1;
+ return (0);
+}
+
+static int
+der_put_length_and_tag(unsigned char *p, size_t len, size_t len_val,
+ Der_class class, Der_type type, int tag, size_t *size)
+{
+ size_t ret = 0;
+ size_t l;
+ int e;
+
+ e = der_put_length(p, len, len_val, &l);
+ if (e)
+ return (e);
+ p -= l;
+ len -= l;
+ ret += l;
+ e = der_put_tag(p, len, class, type, tag, &l);
+ if (e)
+ return (e);
+ p -= l;
+ len -= l;
+ ret += l;
+ *size = ret;
+ return (0);
+}
+
+static int
+encode_enumerated(unsigned char *p, size_t len, const unsigned *data,
+ size_t *size)
+{
+ unsigned num = *data;
+ size_t ret = 0;
+ size_t l;
+ int e;
+
+ e = der_put_int(p, len, num, &l);
+ if (e)
+ return (e);
+ p -= l;
+ len -= l;
+ ret += l;
+ e = der_put_length_and_tag(p, len, l, ASN1_C_UNIV, PRIM, UT_Enumerated, &l);
+ if (e)
+ return (e);
+ p -= l;
+ len -= l;
+ ret += l;
+ *size = ret;
+ return (0);
+}
+
+static int
+encode_octet_string(unsigned char *p, size_t len,
+ const octet_string *k, size_t *size)
+{
+ size_t ret = 0;
+ size_t l;
+ int e;
+
+ e = der_put_octet_string(p, len, k, &l);
+ if (e)
+ return (e);
+ p -= l;
+ len -= l;
+ ret += l;
+ e = der_put_length_and_tag(p, len, l, ASN1_C_UNIV, PRIM, UT_OctetString, &l);
+ if (e)
+ return (e);
+ p -= l;
+ len -= l;
+ ret += l;
+ *size = ret;
+ return (0);
+}
+
+static int
+encode_oid(unsigned char *p, size_t len,
+ const oid *k, size_t *size)
+{
+ size_t ret = 0;
+ size_t l;
+ int e;
+
+ e = der_put_oid(p, len, k, &l);
+ if (e)
+ return (e);
+ p -= l;
+ len -= l;
+ ret += l;
+ e = der_put_length_and_tag(p, len, l, ASN1_C_UNIV, PRIM, UT_OID, &l);
+ if (e)
+ return (e);
+ p -= l;
+ len -= l;
+ ret += l;
+ *size = ret;
+ return (0);
+}
+
+
+/* encapsulate.c */
+
+static void
+gssapi_encap_length(size_t data_len,
+ size_t *len,
+ size_t *total_len,
+ const gss_OID mech)
+{
+ size_t len_len;
+
+ *len = 1 + 1 + mech->length + data_len;
+
+ len_len = length_len(*len);
+
+ *total_len = 1 + len_len + *len;
+}
+
+static u_char *
+gssapi_mech_make_header(u_char *p,
+ size_t len,
+ const gss_OID mech)
+{
+ int e;
+ size_t len_len, foo;
+
+ *p++ = 0x60;
+ len_len = length_len(len);
+ e = der_put_length(p + len_len - 1, len_len, len, &foo);
+ if (e || foo != len_len)
+ return (NULL);
+ p += len_len;
+ *p++ = 0x06;
+ *p++ = mech->length;
+ memcpy(p, mech->elements, mech->length);
+ p += mech->length;
+ return (p);
+}
+
+/*
+ * Give it a krb5_data and it will encapsulate with extra GSS-API wrappings.
+ */
+
+static OM_uint32
+gssapi_spnego_encapsulate(OM_uint32 * minor_status,
+ unsigned char *buf,
+ size_t buf_size,
+ gss_buffer_t output_token,
+ const gss_OID mech)
+{
+ size_t len, outer_len;
+ u_char *p;
+
+ gssapi_encap_length(buf_size, &len, &outer_len, mech);
+
+ output_token->length = outer_len;
+ output_token->value = malloc(outer_len);
+ if (output_token->value == NULL) {
+ *minor_status = ENOMEM;
+ return (GSS_S_FAILURE);
+ }
+ p = gssapi_mech_make_header(output_token->value, len, mech);
+ if (p == NULL) {
+ if (output_token->length != 0)
+ gss_release_buffer(minor_status, output_token);
+ return (GSS_S_FAILURE);
+ }
+ memcpy(p, buf, buf_size);
+ return (GSS_S_COMPLETE);
+}
+
+/* init_sec_context.c */
+/*
+ * SPNEGO wrapper for Kerberos5 GSS-API kouril@ics.muni.cz, 2003 (mostly
+ * based on Heimdal code)
+ */
+
+static int
+add_mech(MechTypeList * mech_list, gss_OID mech)
+{
+ MechType *tmp;
+ int ret;
+
+ tmp = realloc(mech_list->val, (mech_list->len + 1) * sizeof(*tmp));
+ if (tmp == NULL)
+ return (ENOMEM);
+ mech_list->val = tmp;
+
+ ret = der_get_oid(mech->elements, mech->length,
+ &mech_list->val[mech_list->len], NULL);
+ if (ret)
+ return (ret);
+
+ mech_list->len++;
+ return (0);
+}
+
+/*
+ * return the length of the mechanism in token or -1
+ * (which implies that the token was bad - GSS_S_DEFECTIVE_TOKEN
+ */
+
+static ssize_t
+gssapi_krb5_get_mech(const u_char *ptr,
+ size_t total_len,
+ const u_char **mech_ret)
+{
+ size_t len, len_len, mech_len, foo;
+ const u_char *p = ptr;
+ int e;
+
+ if (total_len < 1)
+ return (-1);
+ if (*p++ != 0x60)
+ return (-1);
+ e = der_get_length (p, total_len - 1, &len, &len_len);
+ if (e || 1 + len_len + len != total_len)
+ return (-1);
+ p += len_len;
+ if (*p++ != 0x06)
+ return (-1);
+ e = der_get_length (p, total_len - 1 - len_len - 1,
+ &mech_len, &foo);
+ if (e)
+ return (-1);
+ p += foo;
+ *mech_ret = p;
+ return (mech_len);
+}
+
+static OM_uint32
+spnego_initial(OM_uint32 *minor_status,
+ const gss_cred_id_t initiator_cred_handle,
+ gss_ctx_id_t *context_handle,
+ const gss_name_t target_name,
+ const gss_OID mech_type,
+ OM_uint32 req_flags,
+ OM_uint32 time_req,
+ const gss_channel_bindings_t input_chan_bindings,
+ const gss_buffer_t input_token,
+ gss_OID *actual_mech_type,
+ gss_buffer_t output_token,
+ OM_uint32 *ret_flags,
+ OM_uint32 *time_rec)
+{
+ NegTokenInit token_init;
+ OM_uint32 major_status, minor_status2;
+ gss_buffer_desc krb5_output_token = GSS_C_EMPTY_BUFFER;
+ unsigned char *buf = NULL;
+ size_t buf_size;
+ size_t len;
+ int ret;
+
+ (void)mech_type;
+
+ memset(&token_init, 0, sizeof(token_init));
+
+ ret = add_mech(&token_init.mechTypes, GSS_KRB5_MECH);
+ if (ret) {
+ *minor_status = ret;
+ ret = GSS_S_FAILURE;
+ goto end;
+ }
+
+ major_status = gss_init_sec_context(minor_status,
+ initiator_cred_handle,
+ context_handle,
+ target_name,
+ GSS_KRB5_MECH,
+ req_flags,
+ time_req,
+ input_chan_bindings,
+ input_token,
+ actual_mech_type,
+ &krb5_output_token,
+ ret_flags,
+ time_rec);
+ if (GSS_ERROR(major_status)) {
+ ret = major_status;
+ goto end;
+ }
+ if (krb5_output_token.length > 0) {
+ token_init.mechToken = malloc(sizeof(*token_init.mechToken));
+ if (token_init.mechToken == NULL) {
+ *minor_status = ENOMEM;
+ ret = GSS_S_FAILURE;
+ goto end;
+ }
+ token_init.mechToken->data = krb5_output_token.value;
+ token_init.mechToken->length = krb5_output_token.length;
+ }
+ /*
+ * The MS implementation of SPNEGO seems to not like the mechListMIC
+ * field, so we omit it (it's optional anyway)
+ */
+
+ buf_size = 1024;
+ buf = malloc(buf_size);
+
+ do {
+ ret = encode_NegTokenInit(buf + buf_size - 1,
+ buf_size,
+ &token_init, &len);
+ if (ret == 0) {
+ size_t tmp;
+
+ ret = der_put_length_and_tag(buf + buf_size - len - 1,
+ buf_size - len,
+ len,
+ ASN1_C_CONTEXT,
+ CONS,
+ 0,
+ &tmp);
+ if (ret == 0)
+ len += tmp;
+ }
+ if (ret) {
+ if (ret == ASN1_OVERFLOW) {
+ u_char *tmp;
+
+ buf_size *= 2;
+ tmp = realloc(buf, buf_size);
+ if (tmp == NULL) {
+ *minor_status = ENOMEM;
+ ret = GSS_S_FAILURE;
+ goto end;
+ }
+ buf = tmp;
+ } else {
+ *minor_status = ret;
+ ret = GSS_S_FAILURE;
+ goto end;
+ }
+ }
+ } while (ret == ASN1_OVERFLOW);
+
+ ret = gssapi_spnego_encapsulate(minor_status,
+ buf + buf_size - len, len,
+ output_token, GSS_SPNEGO_MECH);
+ if (ret == GSS_S_COMPLETE)
+ ret = major_status;
+
+end:
+ if (token_init.mechToken != NULL) {
+ free(token_init.mechToken);
+ token_init.mechToken = NULL;
+ }
+ free_NegTokenInit(&token_init);
+ if (krb5_output_token.length != 0)
+ gss_release_buffer(&minor_status2, &krb5_output_token);
+ if (buf)
+ free(buf);
+
+ return (ret);
+}
+
+static OM_uint32
+spnego_reply(OM_uint32 *minor_status,
+ const gss_cred_id_t initiator_cred_handle,
+ gss_ctx_id_t *context_handle,
+ const gss_name_t target_name,
+ const gss_OID mech_type,
+ OM_uint32 req_flags,
+ OM_uint32 time_req,
+ const gss_channel_bindings_t input_chan_bindings,
+ const gss_buffer_t input_token,
+ gss_OID *actual_mech_type,
+ gss_buffer_t output_token,
+ OM_uint32 *ret_flags,
+ OM_uint32 *time_rec)
+{
+ OM_uint32 ret;
+ NegTokenResp resp;
+ unsigned char *buf;
+ size_t buf_size;
+ u_char oidbuf[17];
+ size_t oidlen;
+ gss_buffer_desc sub_token;
+ ssize_t mech_len;
+ const u_char *p;
+ size_t len, taglen;
+
+ (void)mech_type;
+
+ output_token->length = 0;
+ output_token->value = NULL;
+
+ /*
+ * SPNEGO doesn't include gss wrapping on SubsequentContextToken
+ * like the Kerberos 5 mech does. But lets check for it anyway.
+ */
+
+ mech_len = gssapi_krb5_get_mech(input_token->value,
+ input_token->length,
+ &p);
+
+ if (mech_len < 0) {
+ buf = input_token->value;
+ buf_size = input_token->length;
+ } else if ((size_t)mech_len == GSS_KRB5_MECH->length &&
+ memcmp(GSS_KRB5_MECH->elements, p, mech_len) == 0)
+ return (gss_init_sec_context(minor_status,
+ initiator_cred_handle,
+ context_handle,
+ target_name,
+ GSS_KRB5_MECH,
+ req_flags,
+ time_req,
+ input_chan_bindings,
+ input_token,
+ actual_mech_type,
+ output_token,
+ ret_flags,
+ time_rec));
+ else if ((size_t)mech_len == GSS_SPNEGO_MECH->length &&
+ memcmp(GSS_SPNEGO_MECH->elements, p, mech_len) == 0) {
+ ret = gssapi_spnego_decapsulate(minor_status,
+ input_token,
+ &buf,
+ &buf_size,
+ GSS_SPNEGO_MECH);
+ if (ret)
+ return (ret);
+ } else
+ return (GSS_S_BAD_MECH);
+
+ ret = der_match_tag_and_length(buf, buf_size,
+ ASN1_C_CONTEXT, CONS, 1, &len, &taglen);
+ if (ret)
+ return (ret);
+
+ if(len > buf_size - taglen)
+ return (ASN1_OVERRUN);
+
+ ret = decode_NegTokenResp(buf + taglen, len, &resp, NULL);
+ if (ret) {
+ *minor_status = ENOMEM;
+ return (GSS_S_FAILURE);
+ }
+
+ if (resp.negState == NULL ||
+ *(resp.negState) == reject ||
+ resp.supportedMech == NULL) {
+ free_NegTokenResp(&resp);
+ return (GSS_S_BAD_MECH);
+ }
+
+ ret = der_put_oid(oidbuf + sizeof(oidbuf) - 1,
+ sizeof(oidbuf),
+ resp.supportedMech,
+ &oidlen);
+ if (ret || oidlen != GSS_KRB5_MECH->length ||
+ memcmp(oidbuf + sizeof(oidbuf) - oidlen,
+ GSS_KRB5_MECH->elements,
+ oidlen) != 0) {
+ free_NegTokenResp(&resp);
+ return GSS_S_BAD_MECH;
+ }
+
+ if (resp.responseToken != NULL) {
+ sub_token.length = resp.responseToken->length;
+ sub_token.value = resp.responseToken->data;
+ } else {
+ sub_token.length = 0;
+ sub_token.value = NULL;
+ }
+
+ ret = gss_init_sec_context(minor_status,
+ initiator_cred_handle,
+ context_handle,
+ target_name,
+ GSS_KRB5_MECH,
+ req_flags,
+ time_req,
+ input_chan_bindings,
+ &sub_token,
+ actual_mech_type,
+ output_token,
+ ret_flags,
+ time_rec);
+ if (ret) {
+ free_NegTokenResp(&resp);
+ return (ret);
+ }
+
+ /*
+ * XXXSRA I don't think this limited implementation ever needs
+ * to check the MIC -- our preferred mechanism (Kerberos)
+ * authenticates its own messages and is the only mechanism
+ * we'll accept, so if the mechanism negotiation completes
+ * sucessfully, we don't need the MIC. See RFC 4178.
+ */
+
+ free_NegTokenResp(&resp);
+ return (ret);
+}
+
+
+
+OM_uint32
+gss_init_sec_context_spnego(OM_uint32 *minor_status,
+ const gss_cred_id_t initiator_cred_handle,
+ gss_ctx_id_t *context_handle,
+ const gss_name_t target_name,
+ const gss_OID mech_type,
+ OM_uint32 req_flags,
+ OM_uint32 time_req,
+ const gss_channel_bindings_t input_chan_bindings,
+ const gss_buffer_t input_token,
+ gss_OID *actual_mech_type,
+ gss_buffer_t output_token,
+ OM_uint32 *ret_flags,
+ OM_uint32 *time_rec)
+{
+ /* Dirty trick to suppress compiler warnings */
+
+ /* Figure out whether we're starting over or processing a reply */
+
+ if (input_token == GSS_C_NO_BUFFER || input_token->length == 0)
+ return (spnego_initial(minor_status,
+ initiator_cred_handle,
+ context_handle,
+ target_name,
+ mech_type,
+ req_flags,
+ time_req,
+ input_chan_bindings,
+ input_token,
+ actual_mech_type,
+ output_token,
+ ret_flags,
+ time_rec));
+ else
+ return (spnego_reply(minor_status,
+ initiator_cred_handle,
+ context_handle,
+ target_name,
+ mech_type,
+ req_flags,
+ time_req,
+ input_chan_bindings,
+ input_token,
+ actual_mech_type,
+ output_token,
+ ret_flags,
+ time_rec));
+}
+
+#endif /* GSSAPI */
generated by cgit (git 2.34.1) at 2024-04-26 07:00:58 +0000