freebsd-dev/lib/libgssapi/gss_unwrap.3
Doug Rabson c0b9f4fe65 Add a new extensible GSS-API layer which can support GSS-API plugins,
similar the the Solaris implementation. Repackage the krb5 GSS mechanism
as a plugin library for the new implementation. This also includes a
comprehensive set of manpages for the GSS-API functions with text mostly
taken from the RFC.

Reviewed by: Love Hörnquist Åstrand <lha@it.su.se>, ru (build system), des (openssh parts)
2005-12-29 14:40:22 +00:00

192 lines
6.4 KiB
Groff

.\" -*- nroff -*-
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.\" Copyright (c) 2005 Doug Rabson
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.\" The following commands are required for all man pages.
.Dd November 12, 2005
.Os
.Dt GSS_UNWRAP 3 PRM
.Sh NAME
.Nm gss_unwrap ,
.Nm gss_unseal
.Nd Convert a message previously protected by
.Xr gss_wrap 3
back to a usable form
.\" This next command is for sections 2 and 3 only.
.\" .Sh LIBRARY
.Sh SYNOPSIS
.In "gssapi/gssapi.h"
.Ft OM_uint32
.Fo gss_unwrap
.Fa "OM_uint32 *minor_status"
.Fa "const gss_ctx_id_t context_handle"
.Fa "const gss_buffer_t input_message_buffer"
.Fa "gss_buffer_t output_message_buffer"
.Fa "int *conf_state"
.Fa "gss_qop_t *qop_state"
.Fc
.Ft OM_uint32
.Fo gss_unseal
.Fa "OM_uint32 *minor_status"
.Fa "gss_ctx_id_t context_handle"
.Fa "gss_buffer_t input_message_buffer"
.Fa "gss_buffer_t output_message_buffer"
.Fa "int *conf_state"
.Fa "gss_qop_t *qop_state"
.Fc
.Sh DESCRIPTION
Converts a message previously protected by
.Xr gss_wrap 3
back to a usable form,
verifying the embedded MIC.
The
.Dv conf_state
parameter indicates whether the message was encrypted;
the
.Dv qop_state
parameter indicates the strength of protection that was used to provide the
confidentiality and integrity services.
.Pp
Since some application-level protocols may wish to use tokens emitted
by
.Xr gss_wrap 3
to provide "secure framing",
implementations must support the wrapping and unwrapping of
zero-length messages.
.Pp
The
.Fn gss_unseal
routine is an obsolete variant of
.Fn gss_unwrap .
It is
provided for backwards
compatibility with applications using the GSS-API V1 interface.
A distinct entrypoint (as opposed to #define) is provided,
both to allow GSS-API V1 applications to link
and to retain the slight parameter type differences between the
obsolete versions of this routine and its current form.
.Sh PARAMETERS
.Bl -tag
.It minor_status
Mechanism specific status code.
.It context_handle
Identifies the context on which the message arrived.
.It input_message_buffer
Protected message.
.It output_message_buffer
Buffer to receive unwrapped message.
Storage associated with this buffer must
be freed by the application after use use
with a call to
.Xr gss_release_buffer 3 .
.It conf_state
.Bl -tag -width "Non-zero"
.It Non-zero
Confidentiality and integrity protection were used.
.It Zero
Integrity service only was used.
.El
.Pp
Specify NULL if not required.
.It qop_state
Quality of protection provided. Specify NULL if not required.
.El
.Sh RETURN VALUES
.Bl -tag
.It GSS_S_COMPLETE
Successful completion.
.It GSS_S_DEFECTIVE_TOKEN
The token failed consistency checks.
.It GSS_S_BAD_SIG
The MIC was incorrect
.It GSS_S_DUPLICATE_TOKEN
The token was valid, and contained a correct
MIC for the message, but it had already been
processed.
.It GSS_S_OLD_TOKEN
The token was valid, and contained a correct MIC
for the message, but it is too old to check for
duplication.
.It GSS_S_UNSEQ_TOKEN
The token was valid, and contained a correct MIC
for the message, but has been verified out of
sequence; a later token has already been
received.
.It GSS_S_GAP_TOKEN
The token was valid, and contained a correct MIC
for the message, but has been verified out of
sequence; an earlier expected token has not yet
been received.
.It GSS_S_CONTEXT_EXPIRED
The context has already expired.
.It GSS_S_NO_CONTEXT
The context_handle parameter did not identify a valid context.
.El
.Sh SEE ALSO
.Xr gss_wrap 3 ,
.Xr gss_release_buffer 3
.Sh STANDARDS
.Bl -tag
.It RFC 2743
Generic Security Service Application Program Interface Version 2, Update 1
.It RFC 2744
Generic Security Service API Version 2 : C-bindings
.\" .Sh HISTORY
.Sh HISTORY
The
.Nm
manual page example first appeared in
.Fx 7.0 .
.Sh AUTHORS
John Wray, Iris Associates