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OM_uint32 gss_acquire_cred (OM_uint32 *minor_status
,const gss_name_t desired_name
,OM_uint32 time_req
,const gss_OID_set desired_mechs
,gss_cred_usage_t cred_usage
,gss_cred_id_t *output_cred_handle
,gss_OID_set *actual_mechs
,OM_uint32 *time_rec
);
Allows an application to acquire a handle for a pre-existing credential by name. GSS-API implementations must impose a local access-control policy on callers of this routine to prevent unauthorized callers from acquiring credentials to which they are not entitled. This routine is not intended to provide a "login to the network" function, as such a function would involve the creation of new credentials rather than merely acquiring a handle to existing credentials. Such functions, if required, should be defined in implementation-specific extensions to the API.
If desired_name is GSS_C_NO_NAME, the call is interpreted as a
request for a credential handle that will invoke default behavior
when passed to gss_init_sec_context()
(if cred_usage is
GSS_C_INITIATE or GSS_C_BOTH) or gss_accept_sec_context()
(if
cred_usage is GSS_C_ACCEPT or GSS_C_BOTH).
Mechanisms should honor the desired_mechs parameter, and return a credential that is suitable to use only with the requested mechanisms. An exception to this is the case where one underlying credential element can be shared by multiple mechanisms; in this case it is permissible for an implementation to indicate all mechanisms with which the credential element may be used. If desired_mechs is an empty set, behavior is undefined.
This routine is expected to be used primarily by context acceptors, since implementations are likely to provide mechanism-specific ways of obtaining GSS-API initiator credentials from the system login process. Some implementations may therefore not support the acquisition of GSS_C_INITIATE or GSS_C_BOTH credentials via gss_acquire_cred for any name other than GSS_C_NO_NAME, or a name produced by applying either gss_inquire_cred to a valid credential, or gss_inquire_context to an active context.
If credential acquisition is time-consuming for a mechanism, the mechanism may choose to delay the actual acquisition until the credential is required (e.g. by gss_init_sec_context or gss_accept_sec_context). Such mechanism-specific implementation decisions should be invisible to the calling application; thus a call of gss_inquire_cred immediately following the call of gss_acquire_cred must return valid credential data, and may therefore incur the overhead of a deferred credential acquisition.
minor_status |
(integer, modify) Mechanism specific status code. |
|
desired_name |
(gss_name_t, read) Name of principal whose credential should be acquired. |
|
time_req |
(Integer, read, optional) Number of seconds that credentials should remain valid. Specify GSS_C_INDEFINITE to request that the credentials have the maximum permitted lifetime. |
|
desired_mechs |
(Set of Object IDs, read, optional) Set of underlying security mechanisms that may be used. GSS_C_NO_OID_SET may be used to obtain an implementation-specific default. |
|
cred_usage |
(gss_cred_usage_t, read) GSS_C_BOTH - Credentials may be used either to initiate or accept security contexts. GSS_C_INITIATE - Credentials will only be used to initiate security contexts. GSS_C_ACCEPT - Credentials will only be used to accept security contexts. |
|
output_cred_handle |
(gss_cred_id_t, modify) The returned
credential handle. Resources associated with this credential
handle must be released by the application after use with a call
to |
|
actual_mechs |
(Set of Object IDs, modify, optional) The set of
mechanisms for which the credential is valid. Storage associated
with the returned OID-set must be released by the application
after use with a call to |
|
time_rec |
(Integer, modify, optional) Actual number of seconds for which the returned credentials will remain valid. If the implementation does not support expiration of credentials, the value GSS_C_INDEFINITE will be returned. Specify NULL if not required. |
GSS_S_COMPLETE
: Successful completion.
GSS_S_BAD_MECH
: Unavailable mechanism requested.
GSS_S_BAD_NAMETYPE
: Type contained within desired_name parameter
is not supported.
GSS_S_BAD_NAME
: Value supplied for desired_name parameter is ill
formed.
GSS_S_CREDENTIALS_EXPIRED
: The credentials could not be acquired
Because they have expired.
GSS_S_NO_CRED
: No credentials were found for the specified name.
OM_uint32 gss_release_cred (OM_uint32 *minor_status
,gss_cred_id_t *cred_handle
);
Informs GSS-API that the specified credential handle is no longer required by the application, and frees associated resources. The cred_handle is set to GSS_C_NO_CREDENTIAL on successful completion of this call.
OM_uint32 gss_init_sec_context (OM_uint32 *minor_status
,const gss_cred_id_t initiator_cred_handle
,gss_ctx_id_t *context_handle
,const gss_name_t target_name
,const gss_OID mech_type
,OM_uint32 req_flags
,OM_uint32 time_req
,const gss_channel_bindings_t input_chan_bindings
,const gss_buffer_t input_token
,gss_OID *actual_mech_type
,gss_buffer_t output_token
,OM_uint32 *ret_flags
,OM_uint32 *time_rec
);
Initiates the establishment of a security context between the application and a remote peer. Initially, the input_token parameter should be specified either as GSS_C_NO_BUFFER, or as a pointer to a gss_buffer_desc object whose length field contains the value zero. The routine may return a output_token which should be transferred to the peer application, where the peer application will present it to gss_accept_sec_context. If no token need be sent, gss_init_sec_context will indicate this by setting the length field of the output_token argument to zero. To complete the context establishment, one or more reply tokens may be required from the peer application; if so, gss_init_sec_context will return a status containing the supplementary information bit GSS_S_CONTINUE_NEEDED. In this case, gss_init_sec_context should be called again when the reply token is received from the peer application, passing the reply token to gss_init_sec_context via the input_token parameters.
Portable applications should be constructed to use the token length and return status to determine whether a token needs to be sent or waited for. Thus a typical portable caller should always invoke gss_init_sec_context within a loop:
int context_established = 0; gss_ctx_id_t context_hdl = GSS_C_NO_CONTEXT; ... input_token->length = 0;
while (!context_established) { maj_stat = gss_init_sec_context(&min_stat, cred_hdl, &context_hdl, target_name, desired_mech, desired_services, desired_time, input_bindings, input_token, &actual_mech, output_token, &actual_services, &actual_time); if (GSS_ERROR(maj_stat)) { report_error(maj_stat, min_stat); };
if (output_token->length != 0) { send_token_to_peer(output_token); gss_release_buffer(&min_stat, output_token) }; if (GSS_ERROR(maj_stat)) {
if (context_hdl != GSS_C_NO_CONTEXT) gss_delete_sec_context(&min_stat, &context_hdl, GSS_C_NO_BUFFER); break; };
if (maj_stat & GSS_S_CONTINUE_NEEDED) { receive_token_from_peer(input_token); } else { context_established = 1; };
Whenever the routine returns a major status that includes the value GSS_S_CONTINUE_NEEDED, the context is not fully established and the following restrictions apply to the output parameters:
The value returned via the time_rec parameter is undefined unless the accompanying ret_flags parameter contains the bit GSS_C_PROT_READY_FLAG, indicating that per-message services may be applied in advance of a successful completion status, the value returned via the actual_mech_type parameter is undefined until the routine returns a major status value of GSS_S_COMPLETE.
The values of the GSS_C_DELEG_FLAG, GSS_C_MUTUAL_FLAG, GSS_C_REPLAY_FLAG, GSS_C_SEQUENCE_FLAG, GSS_C_CONF_FLAG, GSS_C_INTEG_FLAG and GSS_C_ANON_FLAG bits returned via the ret_flags parameter should contain the values that the implementation expects would be valid if context establishment were to succeed. In particular, if the application has requested a service such as delegation or anonymous authentication via the req_flags argument, and such a service is unavailable from the underlying mechanism, gss_init_sec_context should generate a token that will not provide the service, and indicate via the ret_flags argument that the service will not be supported. The application may choose to abort the context establishment by calling gss_delete_sec_context (if it cannot continue in the absence of the service), or it may choose to transmit the token and continue context establishment (if the service was merely desired but not mandatory).
The values of the GSS_C_PROT_READY_FLAG and GSS_C_TRANS_FLAG bits within ret_flags should indicate the actual state at the time gss_init_sec_context returns, whether or not the context is fully established.
GSS-API implementations that support per-message protection are encouraged to set the GSS_C_PROT_READY_FLAG in the final ret_flags returned to a caller (i.e. when accompanied by a GSS_S_COMPLETE status code). However, applications should not rely on this behavior as the flag was not defined in Version 1 of the GSS-API. Instead, applications should determine what per-message services are available after a successful context establishment according to the GSS_C_INTEG_FLAG and GSS_C_CONF_FLAG values.
All other bits within the ret_flags argument should be set to zero.
If the initial call of gss_init_sec_context()
fails, the
implementation should not create a context object, and should leave
the value of the context_handle parameter set to GSS_C_NO_CONTEXT
to indicate this. In the event of a failure on a subsequent call,
the implementation is permitted to delete the "half-built" security
context (in which case it should set the context_handle parameter
to GSS_C_NO_CONTEXT), but the preferred behavior is to leave the
security context untouched for the application to delete (using
gss_delete_sec_context).
During context establishment, the informational status bits GSS_S_OLD_TOKEN and GSS_S_DUPLICATE_TOKEN indicate fatal errors, and GSS-API mechanisms should always return them in association with a routine error of GSS_S_FAILURE. This requirement for pairing did not exist in version 1 of the GSS-API specification, so applications that wish to run over version 1 implementations must special-case these codes.
The req_flags
values:
GSS_C_DELEG_FLAG
::
True - Delegate credentials to remote peer.
False - Don't delegate.
GSS_C_MUTUAL_FLAG
::
True - Request that remote peer authenticate itself.
False - Authenticate self to remote peer only.
GSS_C_REPLAY_FLAG
::
True - Enable replay detection for messages protected with gss_wrap or gss_get_mic.
False - Don't attempt to detect replayed messages.
GSS_C_SEQUENCE_FLAG
::
True - Enable detection of out-of-sequence protected messages.
False - Don't attempt to detect out-of-sequence messages.
GSS_C_CONF_FLAG
::
True - Request that confidentiality service be made available (via gss_wrap).
False - No per-message confidentiality service is required.
GSS_C_INTEG_FLAG
::
True - Request that integrity service be made available (via gss_wrap or gss_get_mic).
False - No per-message integrity service is required.
GSS_C_ANON_FLAG
::
True - Do not reveal the initiator's identity to the acceptor.
False - Authenticate normally.
The ret_flags
values:
GSS_C_DELEG_FLAG
::
True - Credentials were delegated to the remote peer.
False - No credentials were delegated.
GSS_C_MUTUAL_FLAG
::
True - The remote peer has authenticated itself.
False - Remote peer has not authenticated itself.
GSS_C_REPLAY_FLAG
::
True - replay of protected messages will be detected.
False - replayed messages will not be detected.
GSS_C_SEQUENCE_FLAG
::
True - out-of-sequence protected messages will be detected.
False - out-of-sequence messages will not be detected.
GSS_C_CONF_FLAG
::
True - Confidentiality service may be invoked by calling gss_wrap routine.
False - No confidentiality service (via gss_wrap) available. gss_wrap will provide message encapsulation, data-origin authentication and integrity services only.
GSS_C_INTEG_FLAG
::
True - Integrity service may be invoked by calling either gss_get_mic or gss_wrap routines.
False - Per-message integrity service unavailable.
GSS_C_ANON_FLAG
::
True - The initiator's identity has not been revealed, and will not be revealed if any emitted token is passed to the acceptor.
False - The initiator's identity has been or will be authenticated normally.
GSS_C_PROT_READY_FLAG
::
True - Protection services (as specified by the states of the GSS_C_CONF_FLAG and GSS_C_INTEG_FLAG) are available for use if the accompanying major status return value is either GSS_S_COMPLETE or GSS_S_CONTINUE_NEEDED.
False - Protection services (as specified by the states of the GSS_C_CONF_FLAG and GSS_C_INTEG_FLAG) are available only if the accompanying major status return value is GSS_S_COMPLETE.
GSS_C_TRANS_FLAG
::
True - The resultant security context may be transferred to other
processes via a call to gss_export_sec_context()
.
False - The security context is not transferable.
All other bits should be set to zero.
minor_status |
(integer, modify) Mechanism specific status code. |
|
initiator_cred_handle |
(gss_cred_id_t, read, optional) Handle for credentials claimed. Supply GSS_C_NO_CREDENTIAL to act as a default initiator principal. If no default initiator is defined, the function will return GSS_S_NO_CRED. |
|
context_handle |
(gss_ctx_id_t, read/modify) Context handle for new
context. Supply GSS_C_NO_CONTEXT for first call; use value
returned by first call in continuation calls. Resources
associated with this context-handle must be released by the
application after use with a call to |
|
target_name |
(gss_name_t, read) Name of target. |
|
mech_type |
(OID, read, optional) Object ID of desired mechanism. Supply GSS_C_NO_OID to obtain an implementation specific default. |
|
req_flags |
(bit-mask, read) Contains various independent flags, each of which requests that the context support a specific service option. Symbolic names are provided for each flag, and the symbolic names corresponding to the required flags should be logically-ORed together to form the bit-mask value. See below for the flags. |
|
time_req |
(Integer, read, optional) Desired number of seconds for which context should remain valid. Supply 0 to request a default validity period. |
|
input_chan_bindings |
(channel bindings, read, optional) Application-specified bindings. Allows application to securely bind channel identification information to the security context. Specify GSS_C_NO_CHANNEL_BINDINGS if channel bindings are not used. |
|
input_token |
(buffer, opaque, read, optional) Token received from peer application. Supply GSS_C_NO_BUFFER, or a pointer to a buffer containing the value GSS_C_EMPTY_BUFFER on initial call. |
|
actual_mech_type |
(OID, modify, optional) Actual mechanism used. The OID returned via this parameter will be a pointer to static storage that should be treated as read-only; In particular the application should not attempt to free it. Specify NULL if not required. |
|
output_token |
(buffer, opaque, modify) Token to be sent to peer
application. If the length field of the returned buffer is zero,
no token need be sent to the peer application. Storage
associated with this buffer must be freed by the application
after use with a call to |
|
ret_flags |
(bit-mask, modify, optional) Contains various independent flags, each of which indicates that the context supports a specific service option. Specify NULL if not required. Symbolic names are provided for each flag, and the symbolic names corresponding to the required flags should be logically-ANDed with the ret_flags value to test whether a given option is supported by the context. See below for the flags. |
|
time_rec |
(Integer, modify, optional) Number of seconds for which the context will remain valid. If the implementation does not support context expiration, the value GSS_C_INDEFINITE will be returned. Specify NULL if not required. |
GSS_S_COMPLETE
: Successful completion.
GSS_S_CONTINUE_NEEDED
: Indicates that a token from the peer
application is required to complete the context, and that
gss_init_sec_context must be called again with that token.
GSS_S_DEFECTIVE_TOKEN
: Indicates that consistency checks
performed on the input_token failed.
GSS_S_DEFECTIVE_CREDENTIAL
: Indicates that consistency checks
performed on the credential failed.
GSS_S_NO_CRED
: The supplied credentials were not valid for
context initiation, or the credential handle did not reference any
credentials.
GSS_S_CREDENTIALS_EXPIRED
: The referenced credentials have
expired.
GSS_S_BAD_BINDINGS
: The input_token contains different channel
bindings to those specified via the input_chan_bindings parameter.
GSS_S_BAD_SIG
: The input_token contains an invalid MIC, or a MIC
that could not be verified.
GSS_S_OLD_TOKEN
: The input_token was too old. This is a fatal
error during context establishment.
GSS_S_DUPLICATE_TOKEN
: The input_token is valid, but is a
duplicate of a token already processed. This is a fatal error
during context establishment.
GSS_S_NO_CONTEXT
: Indicates that the supplied context handle did
not refer to a valid context.
GSS_S_BAD_NAMETYPE
: The provided target_name parameter contained
an invalid or unsupported type of name.
GSS_S_BAD_NAME
: The provided target_name parameter was
ill-formed.
GSS_S_BAD_MECH
: The specified mechanism is not supported by the
provided credential, or is unrecognized by the implementation.
OM_uint32 gss_accept_sec_context (OM_uint32 *minor_status
,gss_ctx_id_t *context_handle
,const gss_cred_id_t acceptor_cred_handle
,const gss_buffer_t input_token_buffer
,const gss_channel_bindings_t input_chan_bindings
,gss_name_t *src_name
,gss_OID *mech_type
,gss_buffer_t output_token
,OM_uint32 *ret_flags
,OM_uint32 *time_rec
,gss_cred_id_t *delegated_cred_handle
);
Allows a remotely initiated security context between the application and a remote peer to be established. The routine may return a output_token which should be transferred to the peer application, where the peer application will present it to gss_init_sec_context. If no token need be sent, gss_accept_sec_context will indicate this by setting the length field of the output_token argument to zero. To complete the context establishment, one or more reply tokens may be required from the peer application; if so, gss_accept_sec_context will return a status flag of GSS_S_CONTINUE_NEEDED, in which case it should be called again when the reply token is received from the peer application, passing the token to gss_accept_sec_context via the input_token parameters.
Portable applications should be constructed to use the token length and return status to determine whether a token needs to be sent or waited for. Thus a typical portable caller should always invoke gss_accept_sec_context within a loop:
gss_ctx_id_t context_hdl = GSS_C_NO_CONTEXT;
do { receive_token_from_peer(input_token); maj_stat = gss_accept_sec_context(&min_stat, &context_hdl, cred_hdl, input_token, input_bindings, &client_name, &mech_type, output_token, &ret_flags, &time_rec, &deleg_cred); if (GSS_ERROR(maj_stat)) { report_error(maj_stat, min_stat); }; if (output_token->length != 0) { send_token_to_peer(output_token);
gss_release_buffer(&min_stat, output_token); }; if (GSS_ERROR(maj_stat)) { if (context_hdl != GSS_C_NO_CONTEXT) gss_delete_sec_context(&min_stat, &context_hdl, GSS_C_NO_BUFFER); break; };
Whenever the routine returns a major status that includes the value GSS_S_CONTINUE_NEEDED, the context is not fully established and the following restrictions apply to the output parameters:
The value returned via the time_rec parameter is undefined Unless the accompanying ret_flags parameter contains the bit GSS_C_PROT_READY_FLAG, indicating that per-message services may be applied in advance of a successful completion status, the value returned via the mech_type parameter may be undefined until the routine returns a major status value of GSS_S_COMPLETE.
The values of the GSS_C_DELEG_FLAG, GSS_C_MUTUAL_FLAG,GSS_C_REPLAY_FLAG, GSS_C_SEQUENCE_FLAG, GSS_C_CONF_FLAG,GSS_C_INTEG_FLAG and GSS_C_ANON_FLAG bits returned via the ret_flags parameter should contain the values that the implementation expects would be valid if context establishment were to succeed.
The values of the GSS_C_PROT_READY_FLAG and GSS_C_TRANS_FLAG bits within ret_flags should indicate the actual state at the time gss_accept_sec_context returns, whether or not the context is fully established.
Although this requires that GSS-API implementations set the GSS_C_PROT_READY_FLAG in the final ret_flags returned to a caller (i.e. when accompanied by a GSS_S_COMPLETE status code), applications should not rely on this behavior as the flag was not defined in Version 1 of the GSS-API. Instead, applications should be prepared to use per-message services after a successful context establishment, according to the GSS_C_INTEG_FLAG and GSS_C_CONF_FLAG values.
All other bits within the ret_flags argument should be set to zero. While the routine returns GSS_S_CONTINUE_NEEDED, the values returned via the ret_flags argument indicate the services that the implementation expects to be available from the established context.
If the initial call of gss_accept_sec_context()
fails, the
implementation should not create a context object, and should leave
the value of the context_handle parameter set to GSS_C_NO_CONTEXT to
indicate this. In the event of a failure on a subsequent call, the
implementation is permitted to delete the "half-built" security
context (in which case it should set the context_handle parameter to
GSS_C_NO_CONTEXT), but the preferred behavior is to leave the
security context (and the context_handle parameter) untouched for the
application to delete (using gss_delete_sec_context).
During context establishment, the informational status bits GSS_S_OLD_TOKEN and GSS_S_DUPLICATE_TOKEN indicate fatal errors, and GSS-API mechanisms should always return them in association with a routine error of GSS_S_FAILURE. This requirement for pairing did not exist in version 1 of the GSS-API specification, so applications that wish to run over version 1 implementations must special-case these codes.
The ret_flags
values:
GSS_C_DELEG_FLAG
::
True - Delegated credentials are available via the delegated_cred_handle parameter.
False - No credentials were delegated.
GSS_C_MUTUAL_FLAG
::
True - Remote peer asked for mutual authentication.
False - Remote peer did not ask for mutual authentication.
GSS_C_REPLAY_FLAG
::
True - replay of protected messages will be detected.
False - replayed messages will not be detected.
GSS_C_SEQUENCE_FLAG
::
True - out-of-sequence protected messages will be detected.
False - out-of-sequence messages will not be detected.
GSS_C_CONF_FLAG
::
True - Confidentiality service may be invoked by calling the gss_wrap routine.
False - No confidentiality service (via gss_wrap) available. gss_wrap will provide message encapsulation, data-origin authentication and integrity services only.
GSS_C_INTEG_FLAG
::
True - Integrity service may be invoked by calling either gss_get_mic or gss_wrap routines.
False - Per-message integrity service unavailable.
GSS_C_ANON_FLAG
::
True - The initiator does not wish to be authenticated; the src_name parameter (if requested) contains an anonymous internal name.
False - The initiator has been authenticated normally.
GSS_C_PROT_READY_FLAG
::
True - Protection services (as specified by the states of the GSS_C_CONF_FLAG and GSS_C_INTEG_FLAG) are available if the accompanying major status return value is either GSS_S_COMPLETE or GSS_S_CONTINUE_NEEDED.
False - Protection services (as specified by the states of the GSS_C_CONF_FLAG and GSS_C_INTEG_FLAG) are available only if the accompanying major status return value is GSS_S_COMPLETE.
GSS_C_TRANS_FLAG
::
True - The resultant security context may be transferred to other
processes via a call to gss_export_sec_context()
.
False - The security context is not transferable.
All other bits should be set to zero.
minor_status |
(Integer, modify) Mechanism specific status code. |
|
context_handle |
(gss_ctx_id_t, read/modify) Context handle for new
context. Supply GSS_C_NO_CONTEXT for first call; use value
returned in subsequent calls. Once |
|
acceptor_cred_handle |
(gss_cred_id_t, read) Credential handle claimed by context acceptor. Specify GSS_C_NO_CREDENTIAL to accept the context as a default principal. If GSS_C_NO_CREDENTIAL is specified, but no default acceptor principal is defined, GSS_S_NO_CRED will be returned. |
|
input_token_buffer |
(buffer, opaque, read) Token obtained from remote application. |
|
input_chan_bindings |
(channel bindings, read, optional) Application- specified bindings. Allows application to securely bind channel identification information to the security context. If channel bindings are not used, specify GSS_C_NO_CHANNEL_BINDINGS. |
|
src_name |
(gss_name_t, modify, optional) Authenticated name of
context initiator. After use, this name should be deallocated by
passing it to |
|
mech_type |
(Object ID, modify, optional) Security mechanism used. The returned OID value will be a pointer into static storage, and should be treated as read-only by the caller (in particular, it does not need to be freed). If not required, specify NULL. |
|
output_token |
(buffer, opaque, modify) Token to be passed to peer
application. If the length field of the returned token buffer is
0, then no token need be passed to the peer application. If a
non- zero length field is returned, the associated storage must
be freed after use by the application with a call to
|
|
ret_flags |
(bit-mask, modify, optional) Contains various independent flags, each of which indicates that the context supports a specific service option. If not needed, specify NULL. Symbolic names are provided for each flag, and the symbolic names corresponding to the required flags should be logically-ANDed with the ret_flags value to test whether a given option is supported by the context. See below for the flags. |
|
time_rec |
(Integer, modify, optional) Number of seconds for which the context will remain valid. Specify NULL if not required. |
|
delegated_cred_handle |
(gss_cred_id_t, modify, optional
credential) Handle for credentials received from context
initiator. Only valid if deleg_flag in ret_flags is true, in
which case an explicit credential handle (i.e. not
GSS_C_NO_CREDENTIAL) will be returned; if deleg_flag is false,
|
GSS_S_CONTINUE_NEEDED
: Indicates that a token from the peer
application is required to complete the context, and that
gss_accept_sec_context must be called again with that token.
GSS_S_DEFECTIVE_TOKEN
: Indicates that consistency checks
performed on the input_token failed.
GSS_S_DEFECTIVE_CREDENTIAL
: Indicates that consistency checks
performed on the credential failed.
GSS_S_NO_CRED
: The supplied credentials were not valid for
context acceptance, or the credential handle did not reference any
credentials.
GSS_S_CREDENTIALS_EXPIRED
: The referenced credentials have
expired.
GSS_S_BAD_BINDINGS
: The input_token contains different channel
bindings to those specified via the input_chan_bindings parameter.
GSS_S_NO_CONTEXT
: Indicates that the supplied context handle did
not refer to a valid context.
GSS_S_BAD_SIG
: The input_token contains an invalid MIC.
GSS_S_OLD_TOKEN
: The input_token was too old. This is a fatal
error during context establishment.
GSS_S_DUPLICATE_TOKEN
: The input_token is valid, but is a
duplicate of a token already processed. This is a fatal error
during context establishment.
GSS_S_BAD_MECH
: The received token specified a mechanism that is
not supported by the implementation or the provided credential.
OM_uint32 gss_process_context_token (OM_uint32 *minor_status
,const gss_ctx_id_t context_handle
,const gss_buffer_t token_buffer
);
Provides a way to pass an asynchronous token to the security service. Most context-level tokens are emitted and processed synchronously by gss_init_sec_context and gss_accept_sec_context, and the application is informed as to whether further tokens are expected by the GSS_C_CONTINUE_NEEDED major status bit. Occasionally, a mechanism may need to emit a context-level token at a point when the peer entity is not expecting a token. For example, the initiator's final call to gss_init_sec_context may emit a token and return a status of GSS_S_COMPLETE, but the acceptor's call to gss_accept_sec_context may fail. The acceptor's mechanism may wish to send a token containing an error indication to the initiator, but the initiator is not expecting a token at this point, believing that the context is fully established. Gss_process_context_token provides a way to pass such a token to the mechanism at any time.
OM_uint32 gss_delete_sec_context (OM_uint32 *minor_status
,gss_ctx_id_t *context_handle
,gss_buffer_t output_token
);
Delete a security context. gss_delete_sec_context will delete the local data structures associated with the specified security context, and may generate an output_token, which when passed to the peer gss_process_context_token will instruct it to do likewise. If no token is required by the mechanism, the GSS-API should set the length field of the output_token (if provided) to zero. No further security services may be obtained using the context specified by context_handle.
In addition to deleting established security contexts,
gss_delete_sec_context must also be able to delete "half-built"
security contexts resulting from an incomplete sequence of
gss_init_sec_context()
/gss_accept_sec_context()
calls.
The output_token parameter is retained for compatibility with version 1 of the GSS-API. It is recommended that both peer applications invoke gss_delete_sec_context passing the value GSS_C_NO_BUFFER for the output_token parameter, indicating that no token is required, and that gss_delete_sec_context should simply delete local context data structures. If the application does pass a valid buffer to gss_delete_sec_context, mechanisms are encouraged to return a zero-length token, indicating that no peer action is necessary, and that no token should be transferred by the application.
minor_status |
(Integer, modify) Mechanism specific status code. |
|
context_handle |
(gss_ctx_id_t, modify) Context handle identifying context to delete. After deleting the context, the GSS-API will set this context handle to GSS_C_NO_CONTEXT. |
|
output_token |
(buffer, opaque, modify, optional) Token to be sent to remote application to instruct it to also delete the context. It is recommended that applications specify GSS_C_NO_BUFFER for this parameter, requesting local deletion only. If a buffer parameter is provided by the application, the mechanism may return a token in it; mechanisms that implement only local deletion should set the length field of this token to zero to indicate to the application that no token is to be sent to the peer. |
OM_uint32 gss_context_time (OM_uint32 *minor_status
,const gss_ctx_id_t context_handle
,OM_uint32 *time_rec
);
Determines the number of seconds for which the specified context will remain valid.
OM_uint32 gss_get_mic (OM_uint32 *minor_status
,const gss_ctx_id_t context_handle
,gss_qop_t qop_req
,const gss_buffer_t message_buffer
,gss_buffer_t message_token
);
Generates a cryptographic MIC for the supplied message, and places the MIC in a token for transfer to the peer application. The qop_req parameter allows a choice between several cryptographic algorithms, if supported by the chosen mechanism.
Since some application-level protocols may wish to use tokens
emitted by gss_wrap()
to provide "secure framing", implementations
must support derivation of MICs from zero-length messages.
minor_status |
(Integer, modify) Mechanism specific status code. |
|
context_handle |
(gss_ctx_id_t, read) Identifies the context on which the message will be sent. |
|
qop_req |
(gss_qop_t, read, optional) Specifies requested quality of protection. Callers are encouraged, on portability grounds, to accept the default quality of protection offered by the chosen mechanism, which may be requested by specifying GSS_C_QOP_DEFAULT for this parameter. If an unsupported protection strength is requested, gss_get_mic will return a major_status of GSS_S_BAD_QOP. |
|
message_buffer |
(buffer, opaque, read) Message to be protected. |
|
message_token |
(buffer, opaque, modify) Buffer to receive token. The
application must free storage associated with this buffer after
use with a call to |
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
);
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.
minor_status |
(Integer, modify) Mechanism specific status code. |
|
context_handle |
(gss_ctx_id_t, read) Identifies the context on which the message arrived. |
|
message_buffer |
(buffer, opaque, read) Message to be verified. |
|
token_buffer |
(buffer, opaque, read) Token associated with message. |
|
qop_state |
(gss_qop_t, modify, optional) Quality of protection gained from MIC 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.
OM_uint32 gss_wrap (OM_uint32 *minor_status
,const gss_ctx_id_t context_handle
,int conf_req_flag
,gss_qop_t qop_req
,const gss_buffer_t input_message_buffer
,int *conf_state
,gss_buffer_t output_message_buffer
);
Attaches a cryptographic MIC and optionally encrypts the specified input_message. The output_message contains both the MIC and the message. The qop_req parameter allows a choice between several cryptographic algorithms, if supported by the chosen mechanism.
Since some application-level protocols may wish to use tokens
emitted by gss_wrap()
to provide "secure framing", implementations
must support the wrapping of zero-length messages.
minor_status |
(Integer, modify) Mechanism specific status code. |
|
context_handle |
(gss_ctx_id_t, read) Identifies the context on which the message will be sent. |
|
conf_req_flag |
(boolean, read) Non-zero - Both confidentiality and integrity services are requested. Zero - Only integrity service is requested. |
|
qop_req |
(gss_qop_t, read, optional) Specifies required quality of protection. A mechanism-specific default may be requested by setting qop_req to GSS_C_QOP_DEFAULT. If an unsupported protection strength is requested, gss_wrap will return a major_status of GSS_S_BAD_QOP. |
|
input_message_buffer |
(buffer, opaque, read) Message to be protected. |
|
conf_state |
(boolean, modify, optional) Non-zero - Confidentiality, data origin authentication and integrity services have been applied. Zero - Integrity and data origin services only has been applied. Specify NULL if not required. |
|
output_message_buffer |
(buffer, opaque, modify) Buffer to receive
protected message. Storage associated with this message must be
freed by the application after use with a call to
|
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
);
Converts a message previously protected by gss_wrap 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()
to provide "secure framing", implementations
must support the wrapping and unwrapping of zero-length messages.
minor_status |
(Integer, modify) Mechanism specific status code. |
|
context_handle |
(gss_ctx_id_t, read) Identifies the context on which the message arrived. |
|
input_message_buffer |
(buffer, opaque, read) Protected message. |
|
output_message_buffer |
(buffer, opaque, modify) Buffer to receive
unwrapped message. Storage associated with this buffer must be
freed by the application after use use with a call to
|
|
conf_state |
(boolean, modify, optional) Non-zero - Confidentiality and integrity protection were used. Zero - Integrity service only was used. Specify NULL if not required. |
|
qop_state |
(gss_qop_t, modify, optional) 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.
OM_uint32 gss_display_status (OM_uint32 *minor_status
,OM_uint32 status_value
,int status_type
,const gss_OID mech_type
,OM_uint32 *message_context
,gss_buffer_t status_string
);
Allows an application to obtain a textual representation of a GSS-API status code, for display to the user or for logging purposes. Since some status values may indicate multiple conditions, applications may need to call gss_display_status multiple times, each call generating a single text string. The message_context parameter is used by gss_display_status to store state information about which error messages have already been extracted from a given status_value; message_context must be initialized to 0 by the application prior to the first call, and gss_display_status will return a non-zero value in this parameter if there are further messages to extract.
The message_context parameter contains all state information required by gss_display_status in order to extract further messages from the status_value; even when a non-zero value is returned in this parameter, the application is not required to call gss_display_status again unless subsequent messages are desired. The following code extracts all messages from a given status code and prints them to stderr:
OM_uint32 message_context; OM_uint32 status_code; OM_uint32 maj_status; OM_uint32 min_status; gss_buffer_desc status_string;
...
message_context = 0;
do { maj_status = gss_display_status ( &min_status, status_code, GSS_C_GSS_CODE, GSS_C_NO_OID, &message_context, &status_string)
fprintf(stderr, "%.*s\n", (int)status_string.length,
(char *)status_string.value);
gss_release_buffer(&min_status, &status_string);
minor_status |
(integer, modify) Mechanism specific status code. |
|
status_value |
(Integer, read) Status value to be converted. |
|
status_type |
(Integer, read) GSS_C_GSS_CODE - status_value is a GSS status code. GSS_C_MECH_CODE - status_value is a mechanism status code. |
|
mech_type |
(Object ID, read, optional) Underlying mechanism (used to interpret a minor status value). Supply GSS_C_NO_OID to obtain the system default. |
|
message_context |
(Integer, read/modify) Should be initialized to
zero by the application prior to the first call. On return from
|
|
status_string |
(buffer, character string, modify) Textual
interpretation of the status_value. Storage associated with this
parameter must be freed by the application after use with a call
to |
OM_uint32 gss_indicate_mechs (OM_uint32 *minor_status
,gss_OID_set *mech_set
);
Allows an application to determine which underlying security mechanisms are available.
minor_status |
(integer, modify) Mechanism specific status code. |
|
mech_set |
(set of Object IDs, modify) Set of
implementation-supported mechanisms. The returned gss_OID_set
value will be a dynamically-allocated OID set, that should be
released by the caller after use with a call to
|
OM_uint32 gss_compare_name (OM_uint32 *minor_status
,const gss_name_t name1
,const gss_name_t name2
,int *name_equal
);
Allows an application to compare two internal-form names to determine whether they refer to the same entity.
If either name presented to gss_compare_name denotes an anonymous principal, the routines should indicate that the two names do not refer to the same identity.
minor_status |
(Integer, modify) Mechanism specific status code. |
|
name1 |
(gss_name_t, read) Internal-form name. |
|
name2 |
(gss_name_t, read) Internal-form name. |
|
name_equal |
(boolean, modify) Non-zero - names refer to same entity. Zero - names refer to different entities (strictly, the names are not known to refer to the same identity). |
OM_uint32 gss_display_name (OM_uint32 *minor_status
,const gss_name_t input_name
,gss_buffer_t output_name_buffer
,gss_OID *output_name_type
);
Allows an application to obtain a textual representation of an opaque internal-form name for display purposes. The syntax of a printable name is defined by the GSS-API implementation.
If input_name denotes an anonymous principal, the implementation should return the gss_OID value GSS_C_NT_ANONYMOUS as the output_name_type, and a textual name that is syntactically distinct from all valid supported printable names in output_name_buffer.
If input_name was created by a call to gss_import_name, specifying GSS_C_NO_OID as the name-type, implementations that employ lazy conversion between name types may return GSS_C_NO_OID via the output_name_type parameter.
minor_status |
(Integer, modify) Mechanism specific status code. |
|
input_name |
(gss_name_t, read) Name to be displayed. |
|
output_name_buffer |
(buffer, character-string, modify) Buffer to
receive textual name string. The application must free storage
associated with this name after use with a call to
|
|
output_name_type |
(Object ID, modify, optional) The type of the returned name. The returned gss_OID will be a pointer into static storage, and should be treated as read-only by the caller (in particular, the application should not attempt to free it). Specify NULL if not required. |
OM_uint32 gss_import_name (OM_uint32 *minor_status
,const gss_buffer_t input_name_buffer
,const gss_OID input_name_type
,gss_name_t *output_name
);
Convert a contiguous string name to internal form. In general, the
internal name returned (via the output_name
parameter) will not
be an MN; the exception to this is if the input_name_type
indicates that the contiguous string provided via the
input_name_buffer
parameter is of type GSS_C_NT_EXPORT_NAME, in
which case the returned internal name will be an MN for the
mechanism that exported the name.
minor_status |
(Integer, modify) Mechanism specific status code. |
|
input_name_buffer |
(buffer, octet-string, read) Buffer containing contiguous string name to convert. |
|
input_name_type |
(Object ID, read, optional) Object ID specifying type of printable name. Applications may specify either GSS_C_NO_OID to use a mechanism-specific default printable syntax, or an OID recognized by the GSS-API implementation to name a specific namespace. |
|
output_name |
(gss_name_t, modify) Returned name in internal form.
Storage associated with this name must be freed by the
application after use with a call to |
GSS_S_COMPLETE
: Successful completion.
GSS_S_BAD_NAMETYPE
: The input_name_type was unrecognized.
GSS_S_BAD_NAME
: The input_name parameter could not be interpreted
as a name of the specified type.
GSS_S_BAD_MECH
: The input name-type was GSS_C_NT_EXPORT_NAME, but
the mechanism contained within the input-name is not supported.
OM_uint32 gss_export_name (OM_uint32 *minor_status
,const gss_name_t input_name
,gss_buffer_t exported_name
);
To produce a canonical contiguous string representation of a
mechanism name (MN), suitable for direct comparison (e.g. with
memcmp) for use in authorization functions (e.g. matching entries
in an access-control list). The input_name
parameter must specify
a valid MN (i.e. an internal name generated by
gss_accept_sec_context()
or by gss_canonicalize_name()
).
minor_status |
(Integer, modify) Mechanism specific status code. |
|
input_name |
(gss_name_t, read) The MN to be exported. |
|
exported_name |
(gss_buffer_t, octet-string, modify) The canonical
contiguous string form of |
OM_uint32 gss_release_name (OM_uint32 *minor_status
,gss_name_t *name
);
Free GSSAPI-allocated storage associated with an internal-form name. The name is set to GSS_C_NO_NAME on successful completion of this call.
OM_uint32 gss_release_buffer (OM_uint32 *minor_status
,gss_buffer_t buffer
);
Free storage associated with a buffer. The storage must have been allocated by a GSS-API routine. In addition to freeing the associated storage, the routine will zero the length field in the descriptor to which the buffer parameter refers, and implementations are encouraged to additionally set the pointer field in the descriptor to NULL. Any buffer object returned by a GSS-API routine may be passed to gss_release_buffer (even if there is no storage associated with the buffer).
OM_uint32 gss_release_oid_set (OM_uint32 *minor_status
,gss_OID_set *set
);
Free storage associated with a GSSAPI-generated gss_OID_set object.
The set parameter must refer to an OID-set that was returned from a
GSS-API routine. gss_release_oid_set()
will free the storage
associated with each individual member OID, the OID set's elements
array, and the gss_OID_set_desc.
The gss_OID_set parameter is set to GSS_C_NO_OID_SET on successful completion of this routine.
OM_uint32 gss_inquire_cred (OM_uint32 *minor_status
,const gss_cred_id_t cred_handle
,gss_name_t *name
,OM_uint32 *lifetime
,gss_cred_usage_t *cred_usage
,gss_OID_set *mechanisms
);
Obtains information about a credential.
minor_status |
(integer, modify) Mechanism specific status code. |
|
cred_handle |
(gss_cred_id_t, read) A handle that refers to the target credential. Specify GSS_C_NO_CREDENTIAL to inquire about the default initiator principal. |
|
name |
(gss_name_t, modify, optional) The name whose identity the
credential asserts. Storage associated with this name should be
freed by the application after use with a call to
|
|
lifetime |
(Integer, modify, optional) The number of seconds for which the credential will remain valid. If the credential has expired, this parameter will be set to zero. If the implementation does not support credential expiration, the value GSS_C_INDEFINITE will be returned. Specify NULL if not required. |
|
cred_usage |
(gss_cred_usage_t, modify, optional) How the credential may be used. One of the following: GSS_C_INITIATE, GSS_C_ACCEPT, GSS_C_BOTH. Specify NULL if not required. |
|
mechanisms |
(gss_OID_set, modify, optional) Set of mechanisms
supported by the credential. Storage associated with this OID
set must be freed by the application after use with a call to
|
GSS_S_COMPLETE
: Successful completion.
GSS_S_NO_CRED
: The referenced credentials could not be accessed.
GSS_S_DEFECTIVE_CREDENTIAL
: The referenced credentials were invalid.
GSS_S_CREDENTIALS_EXPIRED
: The referenced credentials have
expired. If the lifetime parameter was not passed as NULL, it will
be set to 0.
OM_uint32 gss_inquire_context (OM_uint32 *minor_status
,const gss_ctx_id_t context_handle
,gss_name_t *src_name
,gss_name_t *targ_name
,OM_uint32 *lifetime_rec
,gss_OID *mech_type
,OM_uint32 *ctx_flags
,int *locally_initiated
,int *open
);
Obtains information about a security context. The caller must already have obtained a handle that refers to the context, although the context need not be fully established.
The ctx_flags
values:
GSS_C_DELEG_FLAG
::
True - Credentials were delegated from the initiator to the acceptor.
False - No credentials were delegated.
GSS_C_MUTUAL_FLAG
::
True - The acceptor was authenticated to the initiator.
False - The acceptor did not authenticate itself.
GSS_C_REPLAY_FLAG
::
True - replay of protected messages will be detected.
False - replayed messages will not be detected.
GSS_C_SEQUENCE_FLAG
::
True - out-of-sequence protected messages will be detected.
False - out-of-sequence messages will not be detected.
GSS_C_CONF_FLAG
::
True - Confidentiality service may be invoked by calling gss_wrap routine.
False - No confidentiality service (via gss_wrap) available. gss_wrap will provide message encapsulation, data-origin authentication and integrity services only.
GSS_C_INTEG_FLAG
::
True - Integrity service may be invoked by calling either gss_get_mic or gss_wrap routines.
False - Per-message integrity service unavailable.
GSS_C_ANON_FLAG
::
True - The initiator's identity will not be revealed to the acceptor. The src_name parameter (if requested) contains an anonymous internal name.
False - The initiator has been authenticated normally.
GSS_C_PROT_READY_FLAG
::
True - Protection services (as specified by the states of the GSS_C_CONF_FLAG and GSS_C_INTEG_FLAG) are available for use.
False - Protection services (as specified by the states of the GSS_C_CONF_FLAG and GSS_C_INTEG_FLAG) are available only if the context is fully established (i.e. if the open parameter is non-zero).
GSS_C_TRANS_FLAG
::
True - The resultant security context may be transferred to other
processes via a call to gss_export_sec_context()
.
False - The security context is not transferable.
minor_status |
(Integer, modify) Mechanism specific status code. |
|
context_handle |
(gss_ctx_id_t, read) A handle that refers to the security context. |
|
src_name |
(gss_name_t, modify, optional) The name of the context
initiator. If the context was established using anonymous
authentication, and if the application invoking
gss_inquire_context is the context acceptor, an anonymous name
will be returned. Storage associated with this name must be
freed by the application after use with a call to
|
|
targ_name |
(gss_name_t, modify, optional) The name of the context
acceptor. Storage associated with this name must be freed by the
application after use with a call to |
|
lifetime_rec |
(Integer, modify, optional) The number of seconds for which the context will remain valid. If the context has expired, this parameter will be set to zero. If the implementation does not support context expiration, the value GSS_C_INDEFINITE will be returned. Specify NULL if not required. |
|
mech_type |
(gss_OID, modify, optional) The security mechanism providing the context. The returned OID will be a pointer to static storage that should be treated as read-only by the application; in particular the application should not attempt to free it. Specify NULL if not required. |
|
ctx_flags |
(bit-mask, modify, optional) Contains various independent flags, each of which indicates that the context supports (or is expected to support, if ctx_open is false) a specific service option. If not needed, specify NULL. Symbolic names are provided for each flag, and the symbolic names corresponding to the required flags should be logically-ANDed with the ret_flags value to test whether a given option is supported by the context. See below for the flags. |
|
locally_initiated |
(Boolean, modify) Non-zero if the invoking application is the context initiator. Specify NULL if not required. |
|
open |
(Boolean, modify) Non-zero if the context is fully established; Zero if a context-establishment token is expected from the peer application. Specify NULL if not required. |
OM_uint32 gss_wrap_size_limit (OM_uint32 *minor_status
,const gss_ctx_id_t context_handle
,int conf_req_flag
,gss_qop_t qop_req
,OM_uint32 req_output_size
,OM_uint32 *max_input_size
);
Allows an application to determine the maximum message size that, if presented to gss_wrap with the same conf_req_flag and qop_req parameters, will result in an output token containing no more than req_output_size bytes.
This call is intended for use by applications that communicate over protocols that impose a maximum message size. It enables the application to fragment messages prior to applying protection.
GSS-API implementations are recommended but not required to detect
invalid QOP values when gss_wrap_size_limit()
is called. This
routine guarantees only a maximum message size, not the
availability of specific QOP values for message protection.
Successful completion of this call does not guarantee that gss_wrap will be able to protect a message of length max_input_size bytes, since this ability may depend on the availability of system resources at the time that gss_wrap is called. However, if the implementation itself imposes an upper limit on the length of messages that may be processed by gss_wrap, the implementation should not return a value via max_input_bytes that is greater than this length.
minor_status |
(Integer, modify) Mechanism specific status code. |
|
context_handle |
(gss_ctx_id_t, read) A handle that refers to the security over which the messages will be sent. |
|
conf_req_flag |
(Boolean, read) Indicates whether gss_wrap will be asked to apply confidentiality protection in addition to integrity protection. See the routine description for gss_wrap for more details. |
|
qop_req |
(gss_qop_t, read) Indicates the level of protection that gss_wrap will be asked to provide. See the routine description for gss_wrap for more details. |
|
req_output_size |
(Integer, read) The desired maximum size for tokens emitted by gss_wrap. |
|
max_input_size |
(Integer, modify) The maximum input message size that may be presented to gss_wrap in order to guarantee that the emitted token shall be no larger than req_output_size bytes. |
OM_uint32 gss_add_cred (OM_uint32 *minor_status
,const gss_cred_id_t input_cred_handle
,const gss_name_t desired_name
,const gss_OID desired_mech
,gss_cred_usage_t cred_usage
,OM_uint32 initiator_time_req
,OM_uint32 acceptor_time_req
,gss_cred_id_t *output_cred_handle
,gss_OID_set *actual_mechs
,OM_uint32 *initiator_time_rec
,OM_uint32 *acceptor_time_rec
);
Adds a credential-element to a credential. The credential-element is identified by the name of the principal to which it refers. GSS-API implementations must impose a local access-control policy on callers of this routine to prevent unauthorized callers from acquiring credential-elements to which they are not entitled. This routine is not intended to provide a "login to the network" function, as such a function would involve the creation of new mechanism-specific authentication data, rather than merely acquiring a GSS-API handle to existing data. Such functions, if required, should be defined in implementation-specific extensions to the API.
If desired_name is GSS_C_NO_NAME, the call is interpreted as a
request to add a credential element that will invoke default behavior
when passed to gss_init_sec_context()
(if cred_usage is
GSS_C_INITIATE or GSS_C_BOTH) or gss_accept_sec_context()
(if
cred_usage is GSS_C_ACCEPT or GSS_C_BOTH).
This routine is expected to be used primarily by context acceptors, since implementations are likely to provide mechanism-specific ways of obtaining GSS-API initiator credentials from the system login process. Some implementations may therefore not support the acquisition of GSS_C_INITIATE or GSS_C_BOTH credentials via gss_acquire_cred for any name other than GSS_C_NO_NAME, or a name produced by applying either gss_inquire_cred to a valid credential, or gss_inquire_context to an active context.
If credential acquisition is time-consuming for a mechanism, the mechanism may choose to delay the actual acquisition until the credential is required (e.g. by gss_init_sec_context or gss_accept_sec_context). Such mechanism-specific implementation decisions should be invisible to the calling application; thus a call of gss_inquire_cred immediately following the call of gss_add_cred must return valid credential data, and may therefore incur the overhead of a deferred credential acquisition.
This routine can be used to either compose a new credential containing all credential-elements of the original in addition to the newly-acquire credential-element, or to add the new credential- element to an existing credential. If NULL is specified for the output_cred_handle parameter argument, the new credential-element will be added to the credential identified by input_cred_handle; if a valid pointer is specified for the output_cred_handle parameter, a new credential handle will be created.
If GSS_C_NO_CREDENTIAL is specified as the input_cred_handle,
gss_add_cred will compose a credential (and set the
output_cred_handle parameter accordingly) based on default behavior.
That is, the call will have the same effect as if the application had
first made a call to gss_acquire_cred()
, specifying the same usage
and passing GSS_C_NO_NAME as the desired_name parameter to obtain an
explicit credential handle embodying default behavior, passed this
credential handle to gss_add_cred()
, and finally called
gss_release_cred()
on the first credential handle.
If GSS_C_NO_CREDENTIAL is specified as the input_cred_handle parameter, a non-NULL output_cred_handle must be supplied.
minor_status |
(integer, modify) Mechanism specific status code. |
|
input_cred_handle |
(gss_cred_id_t, read, optional) The credential
to which a credential-element will be added. If
GSS_C_NO_CREDENTIAL is specified, the routine will compose the
new credential based on default behavior (see text).
Note that, while the credential-handle is not modified by
|
|
desired_name |
(gss_name_t, read.) Name of principal whose credential should be acquired. |
|
desired_mech |
(Object ID, read) Underlying security mechanism with which the credential may be used. |
|
cred_usage |
(gss_cred_usage_t, read) GSS_C_BOTH - Credential may be used either to initiate or accept security contexts. GSS_C_INITIATE - Credential will only be used to initiate security contexts. GSS_C_ACCEPT - Credential will only be used to accept security contexts. |
|
initiator_time_req |
(Integer, read, optional) number of seconds that the credential should remain valid for initiating security contexts. This argument is ignored if the composed credentials are of type GSS_C_ACCEPT. Specify GSS_C_INDEFINITE to request that the credentials have the maximum permitted initiator lifetime. |
|
acceptor_time_req |
(Integer, read, optional) number of seconds that the credential should remain valid for accepting security contexts. This argument is ignored if the composed credentials are of type GSS_C_INITIATE. Specify GSS_C_INDEFINITE to request that the credentials have the maximum permitted initiator lifetime. |
|
output_cred_handle |
(gss_cred_id_t, modify, optional) The returned
credential handle, containing the new credential-element and all
the credential-elements from input_cred_handle. If a valid
pointer to a gss_cred_id_t is supplied for this parameter,
gss_add_cred creates a new credential handle containing all
credential-elements from the input_cred_handle and the newly
acquired credential-element; if NULL is specified for this
parameter, the newly acquired credential-element will be added to
the credential identified by input_cred_handle. The resources
associated with any credential handle returned via this parameter
must be released by the application after use with a call to
|
|
actual_mechs |
(Set of Object IDs, modify, optional) The complete
set of mechanisms for which the new credential is valid. Storage
for the returned OID-set must be freed by the application after
use with a call to |
|
initiator_time_rec |
(Integer, modify, optional) Actual number of seconds for which the returned credentials will remain valid for initiating contexts using the specified mechanism. If the implementation or mechanism does not support expiration of credentials, the value GSS_C_INDEFINITE will be returned. Specify NULL if not required |
|
acceptor_time_rec |
(Integer, modify, optional) Actual number of seconds for which the returned credentials will remain valid for accepting security contexts using the specified mechanism. If the implementation or mechanism does not support expiration of credentials, the value GSS_C_INDEFINITE will be returned. Specify NULL if not required |
GSS_S_COMPLETE
: Successful completion.
GSS_S_BAD_MECH
: Unavailable mechanism requested.
GSS_S_BAD_NAMETYPE
: Type contained within desired_name parameter
is not supported.
GSS_S_BAD_NAME
: Value supplied for desired_name parameter is
ill-formed.
GSS_S_DUPLICATE_ELEMENT
: The credential already contains an
element for the requested mechanism with overlapping usage and
validity period.
GSS_S_CREDENTIALS_EXPIRED
: The required credentials could not be
added because they have expired.
GSS_S_NO_CRED
: No credentials were found for the specified name.
OM_uint32 gss_inquire_cred_by_mech (OM_uint32 *minor_status
,const gss_cred_id_t cred_handle
,const gss_OID mech_type
,gss_name_t *name
,OM_uint32 *initiator_lifetime
,OM_uint32 *acceptor_lifetime
,gss_cred_usage_t *cred_usage
);
Obtains per-mechanism information about a credential.
minor_status |
(Integer, modify) Mechanism specific status code. |
|
cred_handle |
(gss_cred_id_t, read) A handle that refers to the target credential. Specify GSS_C_NO_CREDENTIAL to inquire about the default initiator principal. |
|
mech_type |
(gss_OID, read) The mechanism for which information should be returned. |
|
name |
(gss_name_t, modify, optional) The name whose identity the
credential asserts. Storage associated with this name must be
freed by the application after use with a call to
|
|
initiator_lifetime |
(Integer, modify, optional) The number of seconds for which the credential will remain capable of initiating security contexts under the specified mechanism. If the credential can no longer be used to initiate contexts, or if the credential usage for this mechanism is GSS_C_ACCEPT, this parameter will be set to zero. If the implementation does not support expiration of initiator credentials, the value GSS_C_INDEFINITE will be returned. Specify NULL if not required. |
|
acceptor_lifetime |
(Integer, modify, optional) The number of seconds for which the credential will remain capable of accepting security contexts under the specified mechanism. If the credential can no longer be used to accept contexts, or if the credential usage for this mechanism is GSS_C_INITIATE, this parameter will be set to zero. If the implementation does not support expiration of acceptor credentials, the value GSS_C_INDEFINITE will be returned. Specify NULL if not required. |
|
cred_usage |
(gss_cred_usage_t, modify, optional) How the credential may be used with the specified mechanism. One of the following: GSS_C_INITIATE, GSS_C_ACCEPT, GSS_C_BOTH. Specify NULL if not required. |
GSS_S_COMPLETE
: Successful completion.
GSS_S_NO_CRED
: The referenced credentials could not be accessed.
GSS_S_DEFECTIVE_CREDENTIAL
: The referenced credentials were invalid.
GSS_S_CREDENTIALS_EXPIRED
: The referenced credentials have
expired. If the lifetime parameter was not passed as NULL, it will
be set to 0.
OM_uint32 gss_export_sec_context (OM_uint32 *minor_status
,gss_ctx_id_t *context_handle
,gss_buffer_t interprocess_token
);
Provided to support the sharing of work between multiple processes.
This routine will typically be used by the context-acceptor, in an
application where a single process receives incoming connection
requests and accepts security contexts over them, then passes the
established context to one or more other processes for message
exchange. gss_export_sec_context()
deactivates the security context
for the calling process and creates an interprocess token which,
when passed to gss_import_sec_context in another process, will
re-activate the context in the second process. Only a single
instantiation of a given context may be active at any one time; a
subsequent attempt by a context exporter to access the exported
security context will fail.
The implementation may constrain the set of processes by which the interprocess token may be imported, either as a function of local security policy, or as a result of implementation decisions. For example, some implementations may constrain contexts to be passed only between processes that run under the same account, or which are part of the same process group.
The interprocess token may contain security-sensitive information (for example cryptographic keys). While mechanisms are encouraged to either avoid placing such sensitive information within interprocess tokens, or to encrypt the token before returning it to the application, in a typical object-library GSS-API implementation this may not be possible. Thus the application must take care to protect the interprocess token, and ensure that any process to which the token is transferred is trustworthy.
If creation of the interprocess token is successful, the implementation shall deallocate all process-wide resources associated with the security context, and set the context_handle to GSS_C_NO_CONTEXT. In the event of an error that makes it impossible to complete the export of the security context, the implementation must not return an interprocess token, and should strive to leave the security context referenced by the context_handle parameter untouched. If this is impossible, it is permissible for the implementation to delete the security context, providing it also sets the context_handle parameter to GSS_C_NO_CONTEXT.
minor_status |
(Integer, modify) Mechanism specific status code. |
|
context_handle |
(gss_ctx_id_t, modify) Context handle identifying the context to transfer. |
|
interprocess_token |
(buffer, opaque, modify) Token to be
transferred to target process. Storage associated with this
token must be freed by the application after use with a call to
|
OM_uint32 gss_import_sec_context (OM_uint32 *minor_status
,const gss_buffer_t interprocess_token
,gss_ctx_id_t *context_handle
);
Allows a process to import a security context established by another process. A given interprocess token may be imported only once. See gss_export_sec_context.
minor_status |
(Integer, modify) Mechanism specific status code. |
|
interprocess_token |
(buffer, opaque, modify) Token received from exporting process |
|
context_handle |
(gss_ctx_id_t, modify) Context handle of newly
reactivated context. Resources associated with this context
handle must be released by the application after use with a call
to |
GSS_S_COMPLETE
: Successful completion.
GSS_S_NO_CONTEXT
: The token did not contain a valid context
reference.
GSS_S_DEFECTIVE_TOKEN
: The token was invalid.
GSS_S_UNAVAILABLE
: The operation is unavailable.
GSS_S_UNAUTHORIZED
: Local policy prevents the import of this
context by the current process.
OM_uint32 gss_create_empty_oid_set (OM_uint32 *minor_status
,gss_OID_set *oid_set
);
Create an object-identifier set containing no object identifiers,
to which members may be subsequently added using the
gss_add_oid_set_member()
routine. These routines are intended to
be used to construct sets of mechanism object identifiers, for
input to gss_acquire_cred.
minor_status |
(integer, modify) Mechanism specific status code. |
|
oid_set |
(Set of Object IDs, modify) The empty object identifier
set. The routine will allocate the gss_OID_set_desc object,
which the application must free after use with a call to
|
OM_uint32 gss_add_oid_set_member (OM_uint32 *minor_status
,const gss_OID member_oid
,gss_OID_set *oid_set
);
Add an Object Identifier to an Object Identifier set. This routine
is intended for use in conjunction with gss_create_empty_oid_set
when constructing a set of mechanism OIDs for input to
gss_acquire_cred. The oid_set parameter must refer to an OID-set
that was created by GSS-API (e.g. a set returned by
gss_create_empty_oid_set()
). GSS-API creates a copy of the
member_oid and inserts this copy into the set, expanding the
storage allocated to the OID-set's elements array if necessary.
The routine may add the new member OID anywhere within the elements
array, and implementations should verify that the new member_oid is
not already contained within the elements array; if the member_oid
is already present, the oid_set should remain unchanged.
OM_uint32 gss_test_oid_set_member (OM_uint32 *minor_status
,const gss_OID member
,const gss_OID_set set
,int *present
);
Interrogate an Object Identifier set to determine whether a
specified Object Identifier is a member. This routine is intended
to be used with OID sets returned by gss_indicate_mechs()
,
gss_acquire_cred()
, and gss_inquire_cred()
, but will also work with
user-generated sets.
minor_status |
(integer, modify) Mechanism specific status code. |
|
member |
(Object ID, read) The object identifier whose presence is to be tested. |
|
set |
(Set of Object ID, read) The Object Identifier set. |
|
present |
(Boolean, modify) Non-zero if the specified OID is a member of the set, zero if not. |
OM_uint32 gss_inquire_names_for_mech (OM_uint32 *minor_status
,const gss_OID mechanism
,gss_OID_set *name_types
);
Returns the set of nametypes supported by the specified mechanism.
minor_status |
(Integer, modify) Mechanism specific status code. |
|
mechanism |
(gss_OID, read) The mechanism to be interrogated. |
|
name_types |
(gss_OID_set, modify) Set of name-types supported by
the specified mechanism. The returned OID set must be freed by
the application after use with a call to |
OM_uint32 gss_inquire_mechs_for_name (OM_uint32 *minor_status
,const gss_name_t input_name
,gss_OID_set *mech_types
);
Returns the set of mechanisms supported by the GSS-API implementation that may be able to process the specified name.
Each mechanism returned will recognize at least one element within the name. It is permissible for this routine to be implemented within a mechanism-independent GSS-API layer, using the type information contained within the presented name, and based on registration information provided by individual mechanism implementations. This means that the returned mech_types set may indicate that a particular mechanism will understand the name when in fact it would refuse to accept the name as input to gss_canonicalize_name, gss_init_sec_context, gss_acquire_cred or gss_add_cred (due to some property of the specific name, as opposed to the name type). Thus this routine should be used only as a prefilter for a call to a subsequent mechanism-specific routine.
minor_status |
(Integer, modify) Mechanism specific status code. |
|
input_name |
(gss_name_t, read) The name to which the inquiry relates. |
|
mech_types |
(gss_OID_set, modify) Set of mechanisms that may
support the specified name. The returned OID set must be freed
by the caller after use with a call to |
OM_uint32 gss_canonicalize_name (OM_uint32 *minor_status
,const gss_name_t input_name
,const gss_OID mech_type
,gss_name_t *output_name
);
Generate a canonical mechanism name (MN) from an arbitrary internal
name. The mechanism name is the name that would be returned to a
context acceptor on successful authentication of a context where
the initiator used the input_name in a successful call to
gss_acquire_cred, specifying an OID set containing mech_type
as
its only member, followed by a call to gss_init_sec_context()
,
specifying mech_type
as the authentication mechanism.
minor_status |
(Integer, modify) Mechanism specific status code. |
|
input_name |
(gss_name_t, read) The name for which a canonical form is desired. |
|
mech_type |
(Object ID, read) The authentication mechanism for which the canonical form of the name is desired. The desired mechanism must be specified explicitly; no default is provided. |
|
output_name |
(gss_name_t, modify) The resultant canonical name.
Storage associated with this name must be freed by the
application after use with a call to |
OM_uint32 gss_duplicate_name (OM_uint32 *minor_status
,const gss_name_t src_name
,gss_name_t *dest_name
);
Create an exact duplicate of the existing internal name src_name
.
The new dest_name
will be independent of src_name (i.e. src_name
and dest_name
must both be released, and the release of one shall
not affect the validity of the other).
minor_status |
(Integer, modify) Mechanism specific status code. |
|
src_name |
(gss_name_t, read) Internal name to be duplicated. |
|
dest_name |
(gss_name_t, modify) The resultant copy of |
OM_uint32 gss_sign (OM_uint32 *minor_status
,gss_ctx_id_t context_handle
,int qop_req
,gss_buffer_t message_buffer
,gss_buffer_t message_token
);
OM_uint32 gss_verify (OM_uint32 *minor_status
,gss_ctx_id_t context_handle
,gss_buffer_t message_buffer
,gss_buffer_t token_buffer
,int *qop_state
);
OM_uint32 gss_seal (OM_uint32 *minor_status
,gss_ctx_id_t context_handle
,int conf_req_flag
,int qop_req
,gss_buffer_t input_message_buffer
,int *conf_state
,gss_buffer_t output_message_buffer
);
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
,int *qop_state
);
OM_uint32 gss_inquire_saslname_for_mech (OM_uint32 *minor_status
,const gss_OID desired_mech
,gss_buffer_t sasl_mech_name
,gss_buffer_t mech_name
,gss_buffer_t mech_description
);
Output the SASL mechanism name of a GSS-API mechanism. It also returns a name and description of the mechanism in a user friendly form.
minor_status |
(Integer, modify) Mechanism specific status code. |
|
desired_mech |
(OID, read) Identifies the GSS-API mechanism to query. |
|
sasl_mech_name |
(buffer, character-string, modify, optional)
Buffer to receive SASL mechanism name. The application must free
storage associated with this name after use with a call to
|
|
mech_name |
(buffer, character-string, modify, optional) Buffer to
receive human readable mechanism name. The application must free
storage associated with this name after use with a call to
|
|
mech_description |
(buffer, character-string, modify, optional)
Buffer to receive description of mechanism. The application must
free storage associated with this name after use with a call to
|
OM_uint32 gss_inquire_mech_for_saslname (OM_uint32 *minor_status
,const gss_buffer_t sasl_mech_name
,gss_OID *mech_type
);
Output GSS-API mechanism OID of mechanism associated with given
sasl_mech_name
.
minor_status |
(Integer, modify) Mechanism specific status code. |
|
sasl_mech_name |
(buffer, character-string, read) Buffer with SASL mechanism name. |
|
mech_type |
(OID, modify, optional) Actual mechanism used. The OID returned via this parameter will be a pointer to static storage that should be treated as read-only; In particular the application should not attempt to free it. Specify NULL if not required. |
int gss_oid_equal (gss_const_OID first_oid
,gss_const_OID second_oid
);
Compare two OIDs for equality. The comparison is "deep", i.e., the actual byte sequences of the OIDs are compared instead of just the pointer equality. This function is standardized in RFC 6339.
OM_uint32 gss_encapsulate_token (gss_const_buffer_t input_token
,gss_const_OID token_oid
,gss_buffer_t output_token
);
Add the mechanism-independent token header to GSS-API context token data. This is used for the initial token of a GSS-API context establishment sequence. It incorporates an identifier of the mechanism type to be used on that context, and enables tokens to be interpreted unambiguously at GSS-API peers. See further section 3.1 of RFC 2743. This function is standardized in RFC 6339.
input_token |
(buffer, opaque, read) Buffer with GSS-API context token data. |
|
token_oid |
(Object ID, read) Object identifier of token. |
|
output_token |
(buffer, opaque, modify) Encapsulated token data;
caller must release with |
OM_uint32 gss_decapsulate_token (gss_const_buffer_t input_token
,gss_const_OID token_oid
,gss_buffer_t output_token
);
Remove the mechanism-independent token header from an initial
GSS-API context token. Unwrap a buffer in the
mechanism-independent token format. This is the reverse of
gss_encapsulate_token()
. The translation is loss-less, all data is
preserved as is. This function is standardized in RFC 6339.
input_token |
(buffer, opaque, read) Buffer with GSS-API context token. |
|
token_oid |
(Object ID, read) Expected object identifier of token. |
|
output_token |
(buffer, opaque, modify) Decapsulated token data;
caller must release with |
GSS_S_COMPLETE
: Indicates successful completion, and that output
parameters holds correct information.
GSS_S_DEFECTIVE_TOKEN
: Means that the token failed consistency
checks (e.g., OID mismatch or ASN.1 DER length errors).
GSS_S_FAILURE
: Indicates that decapsulation failed for reasons
unspecified at the GSS-API level.