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freebsd-src/sys/kgssapi/gssd.x
Rick Macklem dd7d42a1fa nfscl/kgssapi: Fix Kerberized NFS mounts to pNFS servers 
During recent testing related to the IETF NFSv4 Bakeathon, it was
discovered that Kerberized NFSv4.1/4.2 mounts to pNFS servers
(sec=krb5[ip],pnfs mount options) was broken.
The FreeBSD client was using the "service principal" for
the MDS to try and establish a rpcsec_gss credential for a DS,
which is incorrect. (A "service principal" looks like
"nfs@<fqdn-of-server>" and the <fqdn-of-server> for the DS is not
the same as the MDS for most pNFS servers.)

To fix this, the rpcsec_gss code needs to be able to do a
reverse DNS lookup of the DS's IP address.  A new kgssapi upcall
to the gssd(8) daemon is added by this patch to do the reverse DNS
along with a new rpcsec_gss function to generate the "service
principal".

A separate patch to the gssd(8) will be committed, so that this
patch will fix the problem.  Without the gssd(8) patch, the new
upcall fails and current/incorrect behaviour remains.

This bug only affects the rare case of a Kerberized (sec=krb5[ip],pnfs)
mount using pNFS.

This patch changes the internal KAPI between the kgssapi and
nfscl modules, but since I did a version bump a few days ago,
I will not do one this time.

MFC after:	1 month
2023-10-23 13:21:14 -07:00

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/*-
* Copyright (c) 2008 Isilon Inc http://www.isilon.com/
* Authors: Doug Rabson <dfr@rabson.org>
* Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
*
* 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.
*/
#ifdef RPC_HDR
%#ifdef _KERNEL
%#include <kgssapi/gssapi.h>
%#else
%#include <gssapi/gssapi.h>
%#include <netdb.h>
%#endif
%extern bool_t xdr_gss_buffer_desc(XDR *xdrs, gss_buffer_desc *buf);
%extern bool_t xdr_gss_OID_desc(XDR *xdrs, gss_OID_desc *oid);
%extern bool_t xdr_gss_OID(XDR *xdrs, gss_OID *oidp);
%extern bool_t xdr_gss_OID_set_desc(XDR *xdrs, gss_OID_set_desc *set);
%extern bool_t xdr_gss_OID_set(XDR *xdrs, gss_OID_set *setp);
%extern bool_t xdr_gss_channel_bindings_t(XDR *xdrs, gss_channel_bindings_t *chp);
#endif
typedef uint64_t gssd_ctx_id_t;
typedef uint64_t gssd_cred_id_t;
typedef uint64_t gssd_name_t;
struct init_sec_context_res {
uint32_t major_status;
uint32_t minor_status;
gssd_ctx_id_t ctx;
gss_OID actual_mech_type;
gss_buffer_desc output_token;
uint32_t ret_flags;
uint32_t time_rec;
};
struct init_sec_context_args {
uint32_t uid;
gssd_cred_id_t cred;
gssd_ctx_id_t ctx;
gssd_name_t name;
gss_OID mech_type;
uint32_t req_flags;
uint32_t time_req;
gss_channel_bindings_t input_chan_bindings;
gss_buffer_desc input_token;
};
struct accept_sec_context_res {
uint32_t major_status;
uint32_t minor_status;
gssd_ctx_id_t ctx;
gssd_name_t src_name;
gss_OID mech_type;
gss_buffer_desc output_token;
uint32_t ret_flags;
uint32_t time_rec;
gssd_cred_id_t delegated_cred_handle;
};
struct accept_sec_context_args {
gssd_ctx_id_t ctx;
gssd_cred_id_t cred;
gss_buffer_desc input_token;
gss_channel_bindings_t input_chan_bindings;
};
struct delete_sec_context_res {
uint32_t major_status;
uint32_t minor_status;
gss_buffer_desc output_token;
};
struct delete_sec_context_args {
gssd_ctx_id_t ctx;
};
enum sec_context_format {
KGSS_HEIMDAL_0_6,
KGSS_HEIMDAL_1_1
};
struct export_sec_context_res {
uint32_t major_status;
uint32_t minor_status;
enum sec_context_format format;
gss_buffer_desc interprocess_token;
};
struct export_sec_context_args {
gssd_ctx_id_t ctx;
};
struct import_name_res {
uint32_t major_status;
uint32_t minor_status;
gssd_name_t output_name;
};
struct import_name_args {
gss_buffer_desc input_name_buffer;
gss_OID input_name_type;
};
struct canonicalize_name_res {
uint32_t major_status;
uint32_t minor_status;
gssd_name_t output_name;
};
struct canonicalize_name_args {
gssd_name_t input_name;
gss_OID mech_type;
};
struct export_name_res {
uint32_t major_status;
uint32_t minor_status;
gss_buffer_desc exported_name;
};
struct export_name_args {
gssd_name_t input_name;
};
struct release_name_res {
uint32_t major_status;
uint32_t minor_status;
};
struct release_name_args {
gssd_name_t input_name;
};
struct pname_to_uid_res {
uint32_t major_status;
uint32_t minor_status;
uint32_t uid;
uint32_t gid;
uint32_t gidlist<>;
};
struct pname_to_uid_args {
gssd_name_t pname;
gss_OID mech;
};
struct acquire_cred_res {
uint32_t major_status;
uint32_t minor_status;
gssd_cred_id_t output_cred;
gss_OID_set actual_mechs;
uint32_t time_rec;
};
struct acquire_cred_args {
uint32_t uid;
gssd_name_t desired_name;
uint32_t time_req;
gss_OID_set desired_mechs;
int cred_usage;
};
struct set_cred_option_res {
uint32_t major_status;
uint32_t minor_status;
};
struct set_cred_option_args {
gssd_cred_id_t cred;
gss_OID option_name;
gss_buffer_desc option_value;
};
struct release_cred_res {
uint32_t major_status;
uint32_t minor_status;
};
struct release_cred_args {
gssd_cred_id_t cred;
};
struct display_status_res {
uint32_t major_status;
uint32_t minor_status;
uint32_t message_context;
gss_buffer_desc status_string;
};
struct display_status_args {
uint32_t status_value;
int status_type;
gss_OID mech_type;
uint32_t message_context;
};
struct ip_to_dns_res {
uint32_t major_status;
uint32_t minor_status;
char dns_name<NI_MAXHOST>;
};
struct ip_to_dns_args {
char ip_addr<NI_MAXHOST>;
};
program GSSD {
version GSSDVERS {
void GSSD_NULL(void) = 0;
init_sec_context_res
GSSD_INIT_SEC_CONTEXT(init_sec_context_args) = 1;
accept_sec_context_res
GSSD_ACCEPT_SEC_CONTEXT(accept_sec_context_args) = 2;
delete_sec_context_res
GSSD_DELETE_SEC_CONTEXT(delete_sec_context_args) = 3;
export_sec_context_res
GSSD_EXPORT_SEC_CONTEXT(export_sec_context_args) = 4;
import_name_res
GSSD_IMPORT_NAME(import_name_args) = 5;
canonicalize_name_res
GSSD_CANONICALIZE_NAME(canonicalize_name_args) = 6;
export_name_res
GSSD_EXPORT_NAME(export_name_args) = 7;
release_name_res
GSSD_RELEASE_NAME(release_name_args) = 8;
pname_to_uid_res
GSSD_PNAME_TO_UID(pname_to_uid_args) = 9;
acquire_cred_res
GSSD_ACQUIRE_CRED(acquire_cred_args) = 10;
set_cred_option_res
GSSD_SET_CRED_OPTION(set_cred_option_args) = 11;
release_cred_res
GSSD_RELEASE_CRED(release_cred_args) = 12;
display_status_res
GSSD_DISPLAY_STATUS(display_status_args) = 13;
ip_to_dns_res
GSSD_IP_TO_DNS(ip_to_dns_args) = 14;
} = 1;
} = 0x40677373;
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