192 lines
6.4 KiB
Groff
192 lines
6.4 KiB
Groff
.\" -*- nroff -*-
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.\"
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.\" Copyright (c) 2005 Doug Rabson
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.\" The following commands are required for all man pages.
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.Dd January 26, 2010
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.Dt GSS_UNWRAP 3 PRM
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.Os
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.Sh NAME
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.Nm gss_unwrap ,
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.Nm gss_unseal
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.Nd Convert a message previously protected by
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.Xr gss_wrap 3
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back to a usable form
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.\" This next command is for sections 2 and 3 only.
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.\" .Sh LIBRARY
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.Sh SYNOPSIS
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.In "gssapi/gssapi.h"
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.Ft OM_uint32
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.Fo gss_unwrap
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.Fa "OM_uint32 *minor_status"
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.Fa "const gss_ctx_id_t context_handle"
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.Fa "const gss_buffer_t input_message_buffer"
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.Fa "gss_buffer_t output_message_buffer"
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.Fa "int *conf_state"
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.Fa "gss_qop_t *qop_state"
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.Fc
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.Ft OM_uint32
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.Fo gss_unseal
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.Fa "OM_uint32 *minor_status"
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.Fa "gss_ctx_id_t context_handle"
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.Fa "gss_buffer_t input_message_buffer"
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.Fa "gss_buffer_t output_message_buffer"
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.Fa "int *conf_state"
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.Fa "gss_qop_t *qop_state"
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.Fc
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.Sh DESCRIPTION
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Converts a message previously protected by
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.Xr gss_wrap 3
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back to a usable form,
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verifying the embedded MIC.
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The
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.Dv conf_state
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parameter indicates whether the message was encrypted;
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the
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.Dv qop_state
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parameter indicates the strength of protection that was used to provide the
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confidentiality and integrity services.
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.Pp
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Since some application-level protocols may wish to use tokens emitted
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by
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.Xr gss_wrap 3
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to provide "secure framing",
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implementations must support the wrapping and unwrapping of
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zero-length messages.
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.Pp
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The
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.Fn gss_unseal
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routine is an obsolete variant of
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.Fn gss_unwrap .
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It is
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provided for backwards
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compatibility with applications using the GSS-API V1 interface.
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A distinct entrypoint (as opposed to #define) is provided,
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both to allow GSS-API V1 applications to link
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and to retain the slight parameter type differences between the
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obsolete versions of this routine and its current form.
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.Sh PARAMETERS
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.Bl -tag -width ".It output_message_buffer"
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.It minor_status
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Mechanism specific status code.
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.It context_handle
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Identifies the context on which the message arrived.
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.It input_message_buffer
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Protected message.
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.It output_message_buffer
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Buffer to receive unwrapped message.
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Storage associated with this buffer must
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be freed by the application after use
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with a call to
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.Xr gss_release_buffer 3 .
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.It conf_state
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.Bl -tag -width "Non-zero"
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.It Non-zero
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Confidentiality and integrity protection were used.
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.It Zero
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Integrity service only was used.
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.El
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.Pp
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Specify NULL if not required.
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.It qop_state
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Quality of protection provided. Specify NULL if not required.
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.El
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.Sh RETURN VALUES
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.Bl -tag -width ".It GSS_S_CONTEXT_EXPIRED"
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.It GSS_S_COMPLETE
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Successful completion.
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.It GSS_S_DEFECTIVE_TOKEN
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The token failed consistency checks.
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.It GSS_S_BAD_SIG
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The MIC was incorrect
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.It GSS_S_DUPLICATE_TOKEN
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The token was valid, and contained a correct
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MIC for the message, but it had already been
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processed.
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.It GSS_S_OLD_TOKEN
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The token was valid, and contained a correct MIC
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for the message, but it is too old to check for
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duplication.
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.It GSS_S_UNSEQ_TOKEN
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The token was valid, and contained a correct MIC
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for the message, but has been verified out of
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sequence; a later token has already been
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received.
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.It GSS_S_GAP_TOKEN
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The token was valid, and contained a correct MIC
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for the message, but has been verified out of
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sequence; an earlier expected token has not yet
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been received.
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.It GSS_S_CONTEXT_EXPIRED
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The context has already expired.
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.It GSS_S_NO_CONTEXT
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The context_handle parameter did not identify a valid context.
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.El
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.Sh SEE ALSO
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.Xr gss_wrap 3 ,
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.Xr gss_release_buffer 3
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.Sh STANDARDS
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.Bl -tag -width ".It RFC 2743"
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.It RFC 2743
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Generic Security Service Application Program Interface Version 2, Update 1
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.It RFC 2744
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Generic Security Service API Version 2 : C-bindings
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.El
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.Sh HISTORY
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The
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.Nm
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function first appeared in
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.Fx 7.0 .
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.Sh AUTHORS
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John Wray, Iris Associates
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.Sh COPYRIGHT
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Copyright (C) The Internet Society (2000). All Rights Reserved.
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.Pp
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This document and translations of it may be copied and furnished to
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others, and derivative works that comment on or otherwise explain it
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or assist in its implementation may be prepared, copied, published
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and distributed, in whole or in part, without restriction of any
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kind, provided that the above copyright notice and this paragraph are
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included on all such copies and derivative works. However, this
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document itself may not be modified in any way, such as by removing
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the copyright notice or references to the Internet Society or other
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Internet organizations, except as needed for the purpose of
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developing Internet standards in which case the procedures for
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copyrights defined in the Internet Standards process must be
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followed, or as required to translate it into languages other than
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English.
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.Pp
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The limited permissions granted above are perpetual and will not be
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revoked by the Internet Society or its successors or assigns.
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.Pp
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This document and the information contained herein is provided on an
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"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
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TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
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BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
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HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
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MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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