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-rw-r--r--lib/gssapi/accept_sec_context.c445
1 files changed, 445 insertions, 0 deletions
diff --git a/lib/gssapi/accept_sec_context.c b/lib/gssapi/accept_sec_context.c
new file mode 100644
index 0000000..d923c36
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+++ b/lib/gssapi/accept_sec_context.c
@@ -0,0 +1,445 @@
+/*
+ * 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.
+ */
+
+#include "gssapi_locl.h"
+
+RCSID("$Id: accept_sec_context.c,v 1.33.2.2 2003/12/19 00:37:06 lha Exp $");
+
+krb5_keytab gssapi_krb5_keytab;
+
+OM_uint32
+gsskrb5_register_acceptor_identity (const char *identity)
+{
+ krb5_error_code ret;
+ char *p;
+
+ ret = gssapi_krb5_init();
+ if(ret)
+ return GSS_S_FAILURE;
+
+ if(gssapi_krb5_keytab != NULL) {
+ krb5_kt_close(gssapi_krb5_context, gssapi_krb5_keytab);
+ gssapi_krb5_keytab = NULL;
+ }
+ asprintf(&p, "FILE:%s", identity);
+ if(p == NULL)
+ return GSS_S_FAILURE;
+ ret = krb5_kt_resolve(gssapi_krb5_context, p, &gssapi_krb5_keytab);
+ free(p);
+ if(ret)
+ return GSS_S_FAILURE;
+ return GSS_S_COMPLETE;
+}
+
+OM_uint32
+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_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
+ )
+{
+ krb5_error_code kret;
+ OM_uint32 ret = GSS_S_COMPLETE;
+ krb5_data indata;
+ krb5_flags ap_options;
+ OM_uint32 flags;
+ krb5_ticket *ticket = NULL;
+ krb5_keytab keytab = NULL;
+ krb5_data fwd_data;
+ OM_uint32 minor;
+
+ GSSAPI_KRB5_INIT();
+
+ krb5_data_zero (&fwd_data);
+ output_token->length = 0;
+ output_token->value = NULL;
+
+ if (src_name != NULL)
+ *src_name = NULL;
+ if (mech_type)
+ *mech_type = GSS_KRB5_MECHANISM;
+
+ if (*context_handle == GSS_C_NO_CONTEXT) {
+ *context_handle = malloc(sizeof(**context_handle));
+ if (*context_handle == GSS_C_NO_CONTEXT) {
+ *minor_status = ENOMEM;
+ return GSS_S_FAILURE;
+ }
+ }
+
+ (*context_handle)->auth_context = NULL;
+ (*context_handle)->source = NULL;
+ (*context_handle)->target = NULL;
+ (*context_handle)->flags = 0;
+ (*context_handle)->more_flags = 0;
+ (*context_handle)->ticket = NULL;
+ (*context_handle)->lifetime = GSS_C_INDEFINITE;
+
+ kret = krb5_auth_con_init (gssapi_krb5_context,
+ &(*context_handle)->auth_context);
+ if (kret) {
+ ret = GSS_S_FAILURE;
+ *minor_status = kret;
+ gssapi_krb5_set_error_string ();
+ goto failure;
+ }
+
+ if (input_chan_bindings != GSS_C_NO_CHANNEL_BINDINGS
+ && input_chan_bindings->application_data.length ==
+ 2 * sizeof((*context_handle)->auth_context->local_port)
+ ) {
+
+ /* Port numbers are expected to be in application_data.value,
+ * initator's port first */
+
+ krb5_address initiator_addr, acceptor_addr;
+
+ memset(&initiator_addr, 0, sizeof(initiator_addr));
+ memset(&acceptor_addr, 0, sizeof(acceptor_addr));
+
+ (*context_handle)->auth_context->remote_port =
+ *(int16_t *) input_chan_bindings->application_data.value;
+
+ (*context_handle)->auth_context->local_port =
+ *((int16_t *) input_chan_bindings->application_data.value + 1);
+
+
+ kret = gss_address_to_krb5addr(input_chan_bindings->acceptor_addrtype,
+ &input_chan_bindings->acceptor_address,
+ (*context_handle)->auth_context->local_port,
+ &acceptor_addr);
+ if (kret) {
+ gssapi_krb5_set_error_string ();
+ ret = GSS_S_BAD_BINDINGS;
+ *minor_status = kret;
+ goto failure;
+ }
+
+ kret = gss_address_to_krb5addr(input_chan_bindings->initiator_addrtype,
+ &input_chan_bindings->initiator_address,
+ (*context_handle)->auth_context->remote_port,
+ &initiator_addr);
+ if (kret) {
+ krb5_free_address (gssapi_krb5_context, &acceptor_addr);
+ gssapi_krb5_set_error_string ();
+ ret = GSS_S_BAD_BINDINGS;
+ *minor_status = kret;
+ goto failure;
+ }
+
+ kret = krb5_auth_con_setaddrs(gssapi_krb5_context,
+ (*context_handle)->auth_context,
+ &acceptor_addr, /* local address */
+ &initiator_addr); /* remote address */
+
+ krb5_free_address (gssapi_krb5_context, &initiator_addr);
+ krb5_free_address (gssapi_krb5_context, &acceptor_addr);
+
+#if 0
+ free(input_chan_bindings->application_data.value);
+ input_chan_bindings->application_data.value = NULL;
+ input_chan_bindings->application_data.length = 0;
+#endif
+
+ if (kret) {
+ gssapi_krb5_set_error_string ();
+ ret = GSS_S_BAD_BINDINGS;
+ *minor_status = kret;
+ goto failure;
+ }
+ }
+
+
+
+ {
+ int32_t tmp;
+
+ krb5_auth_con_getflags(gssapi_krb5_context,
+ (*context_handle)->auth_context,
+ &tmp);
+ tmp |= KRB5_AUTH_CONTEXT_DO_SEQUENCE;
+ krb5_auth_con_setflags(gssapi_krb5_context,
+ (*context_handle)->auth_context,
+ tmp);
+ }
+
+ ret = gssapi_krb5_decapsulate (minor_status,
+ input_token_buffer,
+ &indata,
+ "\x01\x00");
+ if (ret)
+ goto failure;
+
+ if (acceptor_cred_handle == GSS_C_NO_CREDENTIAL) {
+ if (gssapi_krb5_keytab != NULL) {
+ keytab = gssapi_krb5_keytab;
+ }
+ } else if (acceptor_cred_handle->keytab != NULL) {
+ keytab = acceptor_cred_handle->keytab;
+ }
+
+ kret = krb5_rd_req (gssapi_krb5_context,
+ &(*context_handle)->auth_context,
+ &indata,
+ (acceptor_cred_handle == GSS_C_NO_CREDENTIAL) ? NULL
+ : acceptor_cred_handle->principal,
+ keytab,
+ &ap_options,
+ &ticket);
+ if (kret) {
+ ret = GSS_S_FAILURE;
+ *minor_status = kret;
+ gssapi_krb5_set_error_string ();
+ goto failure;
+ }
+
+ kret = krb5_copy_principal (gssapi_krb5_context,
+ ticket->client,
+ &(*context_handle)->source);
+ if (kret) {
+ ret = GSS_S_FAILURE;
+ *minor_status = kret;
+ gssapi_krb5_set_error_string ();
+ goto failure;
+ }
+
+ kret = krb5_copy_principal (gssapi_krb5_context,
+ ticket->server,
+ &(*context_handle)->target);
+ if (kret) {
+ ret = GSS_S_FAILURE;
+ *minor_status = kret;
+ gssapi_krb5_set_error_string ();
+ goto failure;
+ }
+
+ ret = _gss_DES3_get_mic_compat(minor_status, *context_handle);
+ if (ret)
+ goto failure;
+
+ if (src_name != NULL) {
+ kret = krb5_copy_principal (gssapi_krb5_context,
+ ticket->client,
+ src_name);
+ if (kret) {
+ ret = GSS_S_FAILURE;
+ *minor_status = kret;
+ gssapi_krb5_set_error_string ();
+ goto failure;
+ }
+ }
+
+ {
+ krb5_authenticator authenticator;
+
+ kret = krb5_auth_con_getauthenticator(gssapi_krb5_context,
+ (*context_handle)->auth_context,
+ &authenticator);
+ if(kret) {
+ ret = GSS_S_FAILURE;
+ *minor_status = kret;
+ gssapi_krb5_set_error_string ();
+ goto failure;
+ }
+
+ ret = gssapi_krb5_verify_8003_checksum(minor_status,
+ input_chan_bindings,
+ authenticator->cksum,
+ &flags,
+ &fwd_data);
+ krb5_free_authenticator(gssapi_krb5_context, &authenticator);
+ if (ret)
+ goto failure;
+ }
+
+ if (fwd_data.length > 0 && (flags & GSS_C_DELEG_FLAG)) {
+ krb5_ccache ccache;
+ int32_t ac_flags;
+
+ if (delegated_cred_handle == NULL)
+ /* XXX Create a new delegated_cred_handle? */
+ kret = krb5_cc_default (gssapi_krb5_context, &ccache);
+ else if (*delegated_cred_handle == NULL) {
+ if ((*delegated_cred_handle =
+ calloc(1, sizeof(**delegated_cred_handle))) == NULL) {
+ ret = GSS_S_FAILURE;
+ *minor_status = ENOMEM;
+ krb5_set_error_string(gssapi_krb5_context, "out of memory");
+ gssapi_krb5_set_error_string();
+ goto failure;
+ }
+ if ((ret = gss_duplicate_name(minor_status, ticket->client,
+ &(*delegated_cred_handle)->principal)) != 0) {
+ flags &= ~GSS_C_DELEG_FLAG;
+ free(*delegated_cred_handle);
+ *delegated_cred_handle = NULL;
+ goto end_fwd;
+ }
+ }
+ if (delegated_cred_handle != NULL &&
+ (*delegated_cred_handle)->ccache == NULL) {
+ kret = krb5_cc_gen_new (gssapi_krb5_context,
+ &krb5_mcc_ops,
+ &(*delegated_cred_handle)->ccache);
+ ccache = (*delegated_cred_handle)->ccache;
+ }
+ if (delegated_cred_handle != NULL &&
+ (*delegated_cred_handle)->mechanisms == NULL) {
+ ret = gss_create_empty_oid_set(minor_status,
+ &(*delegated_cred_handle)->mechanisms);
+ if (ret)
+ goto failure;
+ ret = gss_add_oid_set_member(minor_status, GSS_KRB5_MECHANISM,
+ &(*delegated_cred_handle)->mechanisms);
+ if (ret)
+ goto failure;
+ }
+
+ if (kret) {
+ flags &= ~GSS_C_DELEG_FLAG;
+ goto end_fwd;
+ }
+
+ kret = krb5_cc_initialize(gssapi_krb5_context,
+ ccache,
+ *src_name);
+ if (kret) {
+ flags &= ~GSS_C_DELEG_FLAG;
+ goto end_fwd;
+ }
+
+ krb5_auth_con_getflags(gssapi_krb5_context,
+ (*context_handle)->auth_context,
+ &ac_flags);
+ krb5_auth_con_setflags(gssapi_krb5_context,
+ (*context_handle)->auth_context,
+ ac_flags & ~KRB5_AUTH_CONTEXT_DO_TIME);
+ kret = krb5_rd_cred2(gssapi_krb5_context,
+ (*context_handle)->auth_context,
+ ccache,
+ &fwd_data);
+ krb5_auth_con_setflags(gssapi_krb5_context,
+ (*context_handle)->auth_context,
+ ac_flags);
+ if (kret) {
+ flags &= ~GSS_C_DELEG_FLAG;
+ goto end_fwd;
+ }
+
+ end_fwd:
+ free(fwd_data.data);
+ }
+
+
+ flags |= GSS_C_TRANS_FLAG;
+
+ if (ret_flags)
+ *ret_flags = flags;
+ (*context_handle)->lifetime = ticket->ticket.endtime;
+ (*context_handle)->flags = flags;
+ (*context_handle)->more_flags |= OPEN;
+
+ if (mech_type)
+ *mech_type = GSS_KRB5_MECHANISM;
+
+ if (time_rec) {
+ ret = gssapi_lifetime_left(minor_status,
+ (*context_handle)->lifetime,
+ time_rec);
+ if (ret)
+ goto failure;
+ }
+
+ if(flags & GSS_C_MUTUAL_FLAG) {
+ krb5_data outbuf;
+
+ kret = krb5_mk_rep (gssapi_krb5_context,
+ (*context_handle)->auth_context,
+ &outbuf);
+ if (kret) {
+ ret = GSS_S_FAILURE;
+ *minor_status = kret;
+ gssapi_krb5_set_error_string ();
+ goto failure;
+ }
+ ret = gssapi_krb5_encapsulate (minor_status,
+ &outbuf,
+ output_token,
+ "\x02\x00");
+ krb5_data_free (&outbuf);
+ if (ret)
+ goto failure;
+ } else {
+ output_token->length = 0;
+ output_token->value = NULL;
+ }
+
+ (*context_handle)->ticket = ticket;
+ ticket = NULL;
+
+#if 0
+ krb5_free_ticket (context, ticket);
+#endif
+
+ *minor_status = 0;
+ return GSS_S_COMPLETE;
+
+ failure:
+ if (fwd_data.length > 0)
+ free(fwd_data.data);
+ if (ticket != NULL)
+ krb5_free_ticket (gssapi_krb5_context, ticket);
+ krb5_auth_con_free (gssapi_krb5_context,
+ (*context_handle)->auth_context);
+ if((*context_handle)->source)
+ krb5_free_principal (gssapi_krb5_context,
+ (*context_handle)->source);
+ if((*context_handle)->target)
+ krb5_free_principal (gssapi_krb5_context,
+ (*context_handle)->target);
+ free (*context_handle);
+ if (src_name != NULL) {
+ gss_release_name (&minor, src_name);
+ *src_name = NULL;
+ }
+ *context_handle = GSS_C_NO_CONTEXT;
+ return ret;
+}
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