GSS_VERIFY_MIC(3) Programmer's Manual GSS_VERIFY_MIC(3)
NAME
gss_verify_mic, gss_verify -- Check a MIC against a message; verify integrity of a received message
SYNOPSIS
#include <gssapi/gssapi.h>
OM_uint32
gss_verify_mic(OM_uint32 *minor_status, const gss_ctx_id_t context_handle, const gss_buffer_t message_buffer,
const gss_buffer_t token_buffer, gss_qop_t *qop_state);
OM_uint32
gss_verify(OM_uint32 *minor_status, gss_ctx_id_t context_handle, gss_buffer_t message_buffer, gss_buffer_t token_buffer,
gss_qop_t *qop_state);
DESCRIPTION
Verifies that a cryptographic MIC, contained in the token parameter, fits the supplied message. The qop_state parameter allows a message
recipient to determine the strength of protection that was applied to the message.
Since some application-level protocols may wish to use tokens emitted by gss_wrap() to provide "secure framing", implementations must support
the calculation and verification of MICs over zero-length messages.
The gss_verify() routine is an obsolete variant of 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.
PARAMETERS
minor_status Mechanism specific status code.
context_handle Identifies the context on which the message arrived.
message_buffer Message to be verified.
token_buffer Token associated with message.
qop_state Quality of protection gained from MIC. Specify NULL if not required.
RETURN VALUES
GSS_S_COMPLETE Successful completion
GSS_S_DEFECTIVE_TOKEN The token failed consistency checks
GSS_S_BAD_SIG The MIC was incorrect
GSS_S_DUPLICATE_TOKEN The token was valid, and contained a correct MIC for the message, but it had already been processed
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
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.
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
GSS_S_CONTEXT_EXPIRED The context has already expired
GSS_S_NO_CONTEXT The context_handle parameter did not identify a valid context
SEE ALSO
gss_wrap(3)
STANDARDS
RFC 2743 Generic Security Service Application Program Interface Version 2, Update 1
RFC 2744 Generic Security Service API Version 2 : C-bindings
HISTORY
The gss_verify_mic function first appeared in FreeBSD 7.0.
AUTHORS
John Wray, Iris Associates
COPYRIGHT
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January 26, 2010 BSD