xref: /freebsd/lib/libgssapi/gss_verify_mic.3 (revision c0b9f4fe659b6839541970eb5675e57f4d814969)

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.Dd November 12, 2005
.Os
.Dt GSS_VERIFY_MIC 3 PRM
.Sh NAME
.Nm gss_verify_mic ,
.Nm gss_verify
.Nd Check a MIC against a message; verify integrity of a received message
.\" This next command is for sections 2 and 3 only.
.\" .Sh LIBRARY
.Sh SYNOPSIS
.In "gssapi/gssapi.h"
.Ft OM_uint32
.Fo gss_verify_mic
.Fa "OM_uint32 *minor_status"
.Fa "const gss_ctx_id_t context_handle"
.Fa "const gss_buffer_t message_buffer"
.Fa "const gss_buffer_t token_buffer"
.Fa "gss_qop_t *qop_state"
.Fc
.Ft OM_uint32
.Fo gss_verify
.Fa "OM_uint32 *minor_status"
.Fa "gss_ctx_id_t context_handle"
.Fa "gss_buffer_t message_buffer"
.Fa "gss_buffer_t token_buffer"
.Fa "gss_qop_t *qop_state"
.Fc
.Sh DESCRIPTION
Verifies that a cryptographic MIC,
contained in the token parameter,
fits the supplied message.
The
.Fa qop_state
parameter allows a message recipient to determine the strength of
protection that was applied to the message.
.Pp
Since some application-level protocols may wish to use tokens emitted
by
.Fn gss_wrap
to provide "secure framing",
implementations must support the calculation and verification of MICs
over zero-length messages.
.Pp
The
.Fn gss_verify
routine is an obsolete variant of
.Fn gss_verify_mic .
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 message_buffer
Message to be verified.
.It token_buffer
Token associated with message.
.It qop_state
Quality of protection gained from MIC.
Specify
.Dv 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
.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
.El
.Sh HISTORY
The
.Nm
manual page example first appeared in
.Fx 7.0 .
.Sh AUTHORS
John Wray, Iris Associates