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GSS_UNWRAP(3) Library Functions Manual (prm) GSS_UNWRAP(3)

gss_unwrap, gss_unsealConvert a message previously protected by gss_wrap(3) back to a usable form

#include <gssapi/gssapi.h>

OM_uint32
gss_unwrap(OM_uint32 *minor_status, const gss_ctx_id_t context_handle, const gss_buffer_t input_message_buffer, gss_buffer_t output_message_buffer, int *conf_state, gss_qop_t *qop_state);

OM_uint32
gss_unseal(OM_uint32 *minor_status, gss_ctx_id_t context_handle, gss_buffer_t input_message_buffer, gss_buffer_t output_message_buffer, int *conf_state, gss_qop_t *qop_state);

Converts a message previously protected by gss_wrap(3) back to a usable form, verifying the embedded MIC. The conf_state parameter indicates whether the message was encrypted; the qop_state parameter indicates the strength of protection that was used to provide the confidentiality and integrity services.

Since some application-level protocols may wish to use tokens emitted by gss_wrap(3) to provide "secure framing", implementations must support the wrapping and unwrapping of zero-length messages.

The () routine is an obsolete variant of (). 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.

minor_status
Mechanism specific status code.
context_handle
Identifies the context on which the message arrived.
input_message_buffer
Protected message.
output_message_buffer
Buffer to receive unwrapped message. Storage associated with this buffer must be freed by the application after use with a call to gss_release_buffer(3).
conf_state
Non-zero
Confidentiality and integrity protection were used.
Zero
Integrity service only was used.

Specify NULL if not required.

qop_state
Quality of protection provided. Specify NULL if not required.

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.

gss_release_buffer(3), gss_wrap(3)

RFC 2743
Generic Security Service Application Program Interface Version 2, Update 1
RFC 2744
Generic Security Service API Version 2 : C-bindings

The gss_unwrap function first appeared in FreeBSD 7.0.

John Wray, Iris Associates

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January 26, 2010 FreeBSD-12.0