freebsd-skq/lib/libgssapi/gss_export_sec_context.3

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.Dd January 26, 2010
.Dt GSS_EXPORT_SEC_CONTEXT 3 PRM
.Os
.Sh NAME
.Nm gss_export_sec_context
.Nd Transfer a security context to another process
.\" This next command is for sections 2 and 3 only.
.\" .Sh LIBRARY
.Sh SYNOPSIS
.In "gssapi/gssapi.h"
.Ft OM_uint32
.Fo gss_export_sec_context
.Fa "OM_uint32 *minor_status"
.Fa "gss_ctx_id_t *context_handle"
.Fa "gss_buffer_t interprocess_token"
.Fc
.Sh DESCRIPTION
Provided to support the sharing of work between multiple processes.
This routine will typically be used by the context-acceptor,
in an application where a single process receives incoming connection
requests and accepts security contexts over them,
then passes the established context to one or more other processes for
message exchange.
.Fn gss_export_sec_context
deactivates the security context for the calling process and creates
an interprocess token which,
when passed to
.Fn gss_import_sec_context
in another process,
will re-activate the context in the second process.
Only a single instantiation of a given context may be active at any
one time;
a subsequent attempt by a context exporter to access the exported security context will fail.
.Pp
The implementation may constrain the set of processes by which the
interprocess token may be imported,
either as a function of local security policy,
or as a result of implementation decisions.
For example,
some implementations may constrain contexts to be passed only between
processes that run under the same account,
or which are part of the same process group.
.Pp
The interprocess token may contain security-sensitive information
(for example cryptographic keys).
While mechanisms are encouraged to either avoid placing such sensitive
information within interprocess tokens,
or to encrypt the token before returning it to the application,
in a typical object-library GSS-API implementation this may not be
possible.
Thus the application must take care to protect the interprocess token,
and ensure that any process to which the token is transferred is
trustworthy.
.Pp
If creation of the interprocess token is successful,
the implementation shall deallocate all process-wide resources
associated with the security context,
and set the context_handle to
.Dv GSS_C_NO_CONTEXT .
In the event of an error that makes it impossible to complete the
export of the security context,
the implementation must not return an interprocess token,
and should strive to leave the security context referenced by the
.Fa context_handle
parameter untouched.
If this is impossible,
it is permissible for the implementation to delete the security
context,
providing it also sets the
.Fa context_handle
parameter to
.Dv GSS_C_NO_CONTEXT .
.Sh PARAMETERS
.Bl -tag -width ".It interprocess_token"
.It minor_status
Mechanism specific status code.
.It context_handle
Context handle identifying the context to transfer.
.It interprocess_token
Token to be transferred to target process.
Storage associated with this token must be freed by the application
after use with a call to
.Fn gss_release_buffer .
.El
.Sh RETURN VALUES
.Bl -tag -width ".It GSS_S_CONTEXT_EXPIRED"
.It GSS_S_COMPLETE
Successful completion
.It GSS_S_CONTEXT_EXPIRED
The context has expired
.It GSS_S_NO_CONTEXT
The context was invalid
.It GSS_S_UNAVAILABLE
The operation is not supported
.El
.Sh SEE ALSO
.Xr gss_import_sec_context 3 ,
.Xr gss_release_buffer 3
.Sh STANDARDS
.Bl -tag -width ".It RFC 2743"
.It RFC 2743
Generic Security Service Application Program Interface Version 2, Update 1
.It RFC 2744
Generic Security Service API Version 2 : C-bindings
.El
.Sh HISTORY
The
.Nm
function first appeared in
.Fx 7.0 .
.Sh AUTHORS
John Wray, Iris Associates
.Sh COPYRIGHT
Copyright (C) The Internet Society (2000).  All Rights Reserved.
.Pp
This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain it
or assist in its implementation may be prepared, copied, published
and distributed, in whole or in part, without restriction of any
kind, provided that the above copyright notice and this paragraph are
included on all such copies and derivative works.  However, this
document itself may not be modified in any way, such as by removing
the copyright notice or references to the Internet Society or other
Internet organizations, except as needed for the purpose of
developing Internet standards in which case the procedures for
copyrights defined in the Internet Standards process must be
followed, or as required to translate it into languages other than
English.
.Pp
The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assigns.
.Pp
This document and the information contained herein is provided on an
"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.