aboutsummaryrefslogtreecommitdiff
path: root/crypto/heimdal/lib/gssapi/mech/gss_accept_sec_context.c
diff options
context:
space:
mode:
Diffstat (limited to 'crypto/heimdal/lib/gssapi/mech/gss_accept_sec_context.c')
-rw-r--r--crypto/heimdal/lib/gssapi/mech/gss_accept_sec_context.c308
1 files changed, 308 insertions, 0 deletions
diff --git a/crypto/heimdal/lib/gssapi/mech/gss_accept_sec_context.c b/crypto/heimdal/lib/gssapi/mech/gss_accept_sec_context.c
new file mode 100644
index 000000000000..bf7ea03f72e4
--- /dev/null
+++ b/crypto/heimdal/lib/gssapi/mech/gss_accept_sec_context.c
@@ -0,0 +1,308 @@
+/*-
+ * Copyright (c) 2005 Doug Rabson
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ *
+ * $FreeBSD: src/lib/libgssapi/gss_accept_sec_context.c,v 1.1 2005/12/29 14:40:20 dfr Exp $
+ */
+
+#include "mech_locl.h"
+
+static OM_uint32
+parse_header(const gss_buffer_t input_token, gss_OID mech_oid)
+{
+ unsigned char *p = input_token->value;
+ size_t len = input_token->length;
+ size_t a, b;
+
+ /*
+ * Token must start with [APPLICATION 0] SEQUENCE.
+ * But if it doesn't assume it is DCE-STYLE Kerberos!
+ */
+ if (len == 0)
+ return (GSS_S_DEFECTIVE_TOKEN);
+
+ p++;
+ len--;
+
+ /*
+ * Decode the length and make sure it agrees with the
+ * token length.
+ */
+ if (len == 0)
+ return (GSS_S_DEFECTIVE_TOKEN);
+ if ((*p & 0x80) == 0) {
+ a = *p;
+ p++;
+ len--;
+ } else {
+ b = *p & 0x7f;
+ p++;
+ len--;
+ if (len < b)
+ return (GSS_S_DEFECTIVE_TOKEN);
+ a = 0;
+ while (b) {
+ a = (a << 8) | *p;
+ p++;
+ len--;
+ b--;
+ }
+ }
+ if (a != len)
+ return (GSS_S_DEFECTIVE_TOKEN);
+
+ /*
+ * Decode the OID for the mechanism. Simplify life by
+ * assuming that the OID length is less than 128 bytes.
+ */
+ if (len < 2 || *p != 0x06)
+ return (GSS_S_DEFECTIVE_TOKEN);
+ if ((p[1] & 0x80) || p[1] > (len - 2))
+ return (GSS_S_DEFECTIVE_TOKEN);
+ mech_oid->length = p[1];
+ p += 2;
+ len -= 2;
+ mech_oid->elements = p;
+
+ return GSS_S_COMPLETE;
+}
+
+static gss_OID_desc krb5_mechanism =
+ {9, rk_UNCONST("\x2a\x86\x48\x86\xf7\x12\x01\x02\x02")};
+static gss_OID_desc ntlm_mechanism =
+ {10, rk_UNCONST("\x2b\x06\x01\x04\x01\x82\x37\x02\x02\x0a")};
+static gss_OID_desc spnego_mechanism =
+ {6, rk_UNCONST("\x2b\x06\x01\x05\x05\x02")};
+
+static OM_uint32
+choose_mech(const gss_buffer_t input, gss_OID mech_oid)
+{
+ OM_uint32 status;
+
+ /*
+ * First try to parse the gssapi token header and see if it's a
+ * correct header, use that in the first hand.
+ */
+
+ status = parse_header(input, mech_oid);
+ if (status == GSS_S_COMPLETE)
+ return GSS_S_COMPLETE;
+
+ /*
+ * Lets guess what mech is really is, callback function to mech ??
+ */
+
+ if (input->length > 8 &&
+ memcmp((const char *)input->value, "NTLMSSP\x00", 8) == 0)
+ {
+ *mech_oid = ntlm_mechanism;
+ return GSS_S_COMPLETE;
+ } else if (input->length != 0 &&
+ ((const char *)input->value)[0] == 0x6E)
+ {
+ /* Could be a raw AP-REQ (check for APPLICATION tag) */
+ *mech_oid = krb5_mechanism;
+ return GSS_S_COMPLETE;
+ } else if (input->length == 0) {
+ /*
+ * There is the a wierd mode of SPNEGO (in CIFS and
+ * SASL GSS-SPENGO where the first token is zero
+ * length and the acceptor returns a mech_list, lets
+ * hope that is what is happening now.
+ *
+ * http://msdn.microsoft.com/en-us/library/cc213114.aspx
+ * "NegTokenInit2 Variation for Server-Initiation"
+ */
+ *mech_oid = spnego_mechanism;
+ return GSS_S_COMPLETE;
+ }
+ return status;
+}
+
+
+GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
+gss_accept_sec_context(OM_uint32 *minor_status,
+ gss_ctx_id_t *context_handle,
+ const gss_cred_id_t acceptor_cred_handle,
+ const gss_buffer_t input_token,
+ 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)
+{
+ OM_uint32 major_status, mech_ret_flags, junk;
+ gssapi_mech_interface m;
+ struct _gss_context *ctx = (struct _gss_context *) *context_handle;
+ struct _gss_cred *cred = (struct _gss_cred *) acceptor_cred_handle;
+ struct _gss_mechanism_cred *mc;
+ gss_cred_id_t acceptor_mc, delegated_mc;
+ gss_name_t src_mn;
+ gss_OID mech_ret_type = NULL;
+
+ *minor_status = 0;
+ if (src_name)
+ *src_name = GSS_C_NO_NAME;
+ if (mech_type)
+ *mech_type = GSS_C_NO_OID;
+ if (ret_flags)
+ *ret_flags = 0;
+ if (time_rec)
+ *time_rec = 0;
+ if (delegated_cred_handle)
+ *delegated_cred_handle = GSS_C_NO_CREDENTIAL;
+ _mg_buffer_zero(output_token);
+
+
+ /*
+ * If this is the first call (*context_handle is NULL), we must
+ * parse the input token to figure out the mechanism to use.
+ */
+ if (*context_handle == GSS_C_NO_CONTEXT) {
+ gss_OID_desc mech_oid;
+
+ major_status = choose_mech(input_token, &mech_oid);
+ if (major_status != GSS_S_COMPLETE)
+ return major_status;
+
+ /*
+ * Now that we have a mechanism, we can find the
+ * implementation.
+ */
+ ctx = malloc(sizeof(struct _gss_context));
+ if (!ctx) {
+ *minor_status = ENOMEM;
+ return (GSS_S_DEFECTIVE_TOKEN);
+ }
+ memset(ctx, 0, sizeof(struct _gss_context));
+ m = ctx->gc_mech = __gss_get_mechanism(&mech_oid);
+ if (!m) {
+ free(ctx);
+ return (GSS_S_BAD_MECH);
+ }
+ *context_handle = (gss_ctx_id_t) ctx;
+ } else {
+ m = ctx->gc_mech;
+ }
+
+ if (cred) {
+ HEIM_SLIST_FOREACH(mc, &cred->gc_mc, gmc_link)
+ if (mc->gmc_mech == m)
+ break;
+ if (!mc) {
+ gss_delete_sec_context(&junk, context_handle, NULL);
+ return (GSS_S_BAD_MECH);
+ }
+ acceptor_mc = mc->gmc_cred;
+ } else {
+ acceptor_mc = GSS_C_NO_CREDENTIAL;
+ }
+ delegated_mc = GSS_C_NO_CREDENTIAL;
+
+ mech_ret_flags = 0;
+ major_status = m->gm_accept_sec_context(minor_status,
+ &ctx->gc_ctx,
+ acceptor_mc,
+ input_token,
+ input_chan_bindings,
+ &src_mn,
+ &mech_ret_type,
+ output_token,
+ &mech_ret_flags,
+ time_rec,
+ &delegated_mc);
+ if (major_status != GSS_S_COMPLETE &&
+ major_status != GSS_S_CONTINUE_NEEDED)
+ {
+ _gss_mg_error(m, major_status, *minor_status);
+ gss_delete_sec_context(&junk, context_handle, NULL);
+ return (major_status);
+ }
+
+ if (mech_type)
+ *mech_type = mech_ret_type;
+
+ if (src_name && src_mn) {
+ /*
+ * Make a new name and mark it as an MN.
+ */
+ struct _gss_name *name = _gss_make_name(m, src_mn);
+
+ if (!name) {
+ m->gm_release_name(minor_status, &src_mn);
+ gss_delete_sec_context(&junk, context_handle, NULL);
+ return (GSS_S_FAILURE);
+ }
+ *src_name = (gss_name_t) name;
+ } else if (src_mn) {
+ m->gm_release_name(minor_status, &src_mn);
+ }
+
+ if (mech_ret_flags & GSS_C_DELEG_FLAG) {
+ if (!delegated_cred_handle) {
+ m->gm_release_cred(minor_status, &delegated_mc);
+ mech_ret_flags &=
+ ~(GSS_C_DELEG_FLAG|GSS_C_DELEG_POLICY_FLAG);
+ } else if (gss_oid_equal(mech_ret_type, &m->gm_mech_oid) == 0) {
+ /*
+ * If the returned mech_type is not the same
+ * as the mech, assume its pseudo mech type
+ * and the returned type is already a
+ * mech-glue object
+ */
+ *delegated_cred_handle = delegated_mc;
+
+ } else if (delegated_mc) {
+ struct _gss_cred *dcred;
+ struct _gss_mechanism_cred *dmc;
+
+ dcred = malloc(sizeof(struct _gss_cred));
+ if (!dcred) {
+ *minor_status = ENOMEM;
+ gss_delete_sec_context(&junk, context_handle, NULL);
+ return (GSS_S_FAILURE);
+ }
+ HEIM_SLIST_INIT(&dcred->gc_mc);
+ dmc = malloc(sizeof(struct _gss_mechanism_cred));
+ if (!dmc) {
+ free(dcred);
+ *minor_status = ENOMEM;
+ gss_delete_sec_context(&junk, context_handle, NULL);
+ return (GSS_S_FAILURE);
+ }
+ dmc->gmc_mech = m;
+ dmc->gmc_mech_oid = &m->gm_mech_oid;
+ dmc->gmc_cred = delegated_mc;
+ HEIM_SLIST_INSERT_HEAD(&dcred->gc_mc, dmc, gmc_link);
+
+ *delegated_cred_handle = (gss_cred_id_t) dcred;
+ }
+ }
+
+ if (ret_flags)
+ *ret_flags = mech_ret_flags;
+ return (major_status);
+}