# Heimdal GSS-API functions

## Functions

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL | gss_add_oid_set_member (OM_uint32 *minor_status, const gss_OID member_oid, gss_OID_set *oid_set)
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL | gss_wrap_iov (OM_uint32 *minor_status, gss_ctx_id_t context_handle, int conf_req_flag, gss_qop_t qop_req, int *conf_state, gss_iov_buffer_desc *iov, int iov_count)
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL | gss_unwrap_iov (OM_uint32 *minor_status, gss_ctx_id_t context_handle, int *conf_state, gss_qop_t *qop_state, gss_iov_buffer_desc *iov, int iov_count)
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL | gss_wrap_iov_length (OM_uint32 *minor_status, gss_ctx_id_t context_handle, int conf_req_flag, gss_qop_t qop_req, int *conf_state, gss_iov_buffer_desc *iov, int iov_count)
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL | gss_release_iov_buffer (OM_uint32 *minor_status, gss_iov_buffer_desc *iov, int iov_count)
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL | gss_canonicalize_name (OM_uint32 *minor_status, const gss_name_t input_name, const gss_OID mech_type, gss_name_t *output_name)
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL | 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)

GSSAPI_LIB_FUNCTION OM_uint32
GSSAPI_LIB_CALL

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 input_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)

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL | 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)
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL | gss_inquire_attrs_for_mech (OM_uint32 *minor_status, gss_const_OID mech, gss_OID_set *mech_attr, gss_OID_set *known_mech_attrs)
GSSAPI_LIB_FUNCTION int GSSAPI_LIB_CALL | gss_oid_equal (gss_const_OID a, gss_const_OID b)
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL | gss_release_cred (OM_uint32 *minor_status, gss_cred_id_t *cred_handle)
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL | gss_release_name (OM_uint32 *minor_status, gss_name_t *input_name)
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL | 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)

## Variables

gss_OID_desc GSSAPI_LIB_FUNCTION | __gss_c_attr_stream_sizes_oid_desc

## Detailed Description

## Function Documentation

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL gss_add_oid_set_member | ( | OM_uint32 * | minor_status,
|  | const gss_OID | member_oid,
|  | gss_OID_set * | oid_set |
| ) |  |  |

Add a oid to the oid set, function does not make a copy of the oid, so the pointer to member_oid needs to be stable for the whole time oid_set is used.

If there is a duplicate member of the oid, the new member is not added to to the set.

Parameters:

  | minor_status | minor status code.
  | member_oid | member to add to the oid set
  | oid_set | oid set to add the member too

Returns:
  a gss_error code, see gss_display_status() about printing the error code.

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL gss_canonicalize_name | ( | OM_uint32 * | minor_status,
|  | const gss_name_t | input_name,
|  | const gss_OID | mech_type,
|  | gss_name_t * | output_name |
| ) |  |  |

gss_canonicalize_name takes a Internal Name (IN) and converts in into a mechanism specific Mechanism Name (MN).

The input name may multiple name, or generic name types.

If the input_name if of the GSS_C_NT_USER_NAME, and the Kerberos mechanism is specified, the resulting MN type is a GSS_KRB5_NT_PRINCIPAL_NAME.

For more information about internalVSmechname.

Parameters:

  | minor_status | minor status code.
  | input_name | name to covert, unchanged by gss_canonicalize_name().
  | mech_type | the type to convert Name too.
  | output_name | the resulting type, release with gss_release_name(), independent of input_name.

Returns:
  a gss_error code, see gss_display_status() about printing the error code.

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL 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 |
| ) |  |  |

Import a name internal or mechanism name

Type of name and their format:

- GSS_C_NO_OID
- GSS_C_NT_USER_NAME
- GSS_C_NT_HOSTBASED_SERVICE
- GSS_C_NT_EXPORT_NAME
- GSS_C_NT_ANONYMOUS
- GSS_KRB5_NT_PRINCIPAL_NAME

For more information about internalVSmechname.

Parameters:

  | minor_status | minor status code
  | input_name_buffer | import name buffer
  | input_name_type | type of the import name buffer
  | output_name | the resulting type, release with gss_release_name(), independent of input_name

Returns:
  a gss_error code, see gss_display_status() about printing the error code.

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL 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 | input_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 |
| ) |  |  |

As the initiator build a context with an acceptor.

Returns in the major

- GSS_S_COMPLETE - if the context if build
- GSS_S_CONTINUE_NEEDED - if the caller needs to continue another round of gss_i nit_sec_context
- error code - any other error code

Parameters:

  | minor_status | minor status code.
  | initiator_cred_handle | the credential to use when building the context, if GSS_C_NO_CREDENTIAL is passed, the default credential for the mechanism will be used.
  | context_handle | a pointer to a context handle, will be returned as long as there is not an error.
  | target_name | the target name of acceptor, created using gss_import_name(). The name is can be of any name types the mechanism supports, check supported name types with gss_inquire_names_for_mech().
  | input_mech_type | mechanism type to use, if GSS_C_NO_OID is used, Kerberos (GSS_KRB5_MECHANISM) will be tried. Other available mechanism are listed in the GSS-API mechanisms section.
  | req_flags | flags using when building the context, see Context creation flags
  | time_req | time requested this context should be valid in seconds, common used value is GSS_C_INDEFINITE
  | input_chan_bindings | Channel bindings used, if not exepected otherwise, used GSS_C_NO_CHANNEL_BINDINGS
  | input_token | input token sent from the acceptor, for the initial packet the buffer of { NULL, 0 } should be used.
  | actual_mech_type | the actual mech used, MUST NOT be freed since it pointing to static memory.
  | output_token | if there is an output token, regardless of complete, continue_needed, or error it should be sent to the acceptor
  | ret_flags | return what flags was negotitated, caller should check if they are accetable. For example, if GSS_C_MUTUAL_FLAG was negotiated with the acceptor or not.
  | time_rec | amount of time this context is valid for

Returns:
  a gss_error code, see gss_display_status() about printing the error code.

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL gss_inquire_attrs_for_mech | ( | OM_uint32 * | minor_status,
|  | gss_const_OID | mech,
|  | gss_OID_set * | mech_attr,
|  | gss_OID_set * | known_mech_attrs |
| ) |  |  |

List support attributes for a mech and/or all mechanisms.

Parameters:

  | minor_status | minor status code
  | mech | given together with mech_attr will return the list of attributes for mechanism, can optionally be GSS_C_NO_OID.
  | mech_attr | see mech parameter, can optionally be NULL, release with gss_release_oid_set().
  | known_mech_attrs | all attributes for mechanisms supported, release with gss_release_oid_set().

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL 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 |
| ) |  |  |

Returns different protocol names and description of the mechanism.

Parameters:

  | minor_status | minor status code
  | desired_mech | mech list query
  | sasl_mech_name | SASL GS2 protocol name
  | mech_name | gssapi protocol name
  | mech_description | description of gssapi mech

Returns:
  returns GSS_S_COMPLETE or a error code.

GSSAPI_LIB_FUNCTION int GSSAPI_LIB_CALL gss_oid_equal | ( | gss_const_OID | a,
|  | gss_const_OID | b |
| ) |  |  |

Compare two GSS-API OIDs with each other.

GSS_C_NO_OID matches nothing, not even it-self.

Parameters:

  | a | first oid to compare
  | b | second oid to compare

Returns:
  non-zero when both oid are the same OID, zero when they are not the same.

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL gss_release_cred | ( | OM_uint32 * | minor_status,
|  | gss_cred_id_t * | cred_handle |
| ) |  |  |

Release a credentials

Its ok to release the GSS_C_NO_CREDENTIAL/NULL credential, it will return a GSS_S_COMPLETE error code. On return cred_handle is set ot GSS_C_NO_CREDENTIAL.

Example:

     gss_cred_id_t cred = GSS_C_NO_CREDENTIAL;
     major = gss_release_cred(&minor, &cred);

Parameters:

  | minor_status | minor status return code, mech specific
  | cred_handle | a pointer to the credential too release

Returns:
  an gssapi error code

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL gss_release_iov_buffer | ( | OM_uint32 * | minor_status,
|  | gss_iov_buffer_desc * | iov,
|  | int | iov_count |
| ) |  |  |

Free all buffer allocated by gss_wrap_iov() or gss_unwrap_iov() by looking at the GSS_IOV_BUFFER_FLAG_ALLOCATED flag.

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL gss_release_name | ( | OM_uint32 * | minor_status,
|  | gss_name_t * | input_name |
| ) |  |  |

Free a name

import_name can point to NULL or be NULL, or a pointer to a gss_name_t structure. If it was a pointer to gss_name_t, the pointer will be set to NULL on success and failure.

Parameters:

  | minor_status | minor status code
  | input_name | name to free

Returns:
  a gss_error code, see gss_display_status() about printing the error code.

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL gss_unwrap_iov | ( | OM_uint32 * | minor_status,
|  | gss_ctx_id_t | context_handle,
|  | int * | conf_state,
|  | gss_qop_t * | qop_state,
|  | gss_iov_buffer_desc * | iov,
|  | int | iov_count |
| ) |  |  |

Decrypt or verifies the signature on the data.

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL 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 |
| ) |  |  |

Wrap a message using either confidentiality (encryption + signature) or sealing (signature).

Parameters:

  | minor_status | minor status code.
  | context_handle | context handle.
  | conf_req_flag | if non zero, confidentiality is requestd.
  | qop_req | type of protection needed, in most cases it GSS_C_QOP_DEFAULT should be passed in.
  | input_message_buffer | messages to wrap
  | conf_state | returns non zero if confidentiality was honoured.
  | output_message_buffer | the resulting buffer, release with gss_release_buffer().

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL gss_wrap_iov | ( | OM_uint32 * | minor_status,
|  | gss_ctx_id_t | context_handle,
|  | int | conf_req_flag,
|  | gss_qop_t | qop_req,
|  | int * | conf_state,
|  | gss_iov_buffer_desc * | iov,
|  | int | iov_count |
| ) |  |  |

Encrypts or sign the data.

This is a more complicated version of gss_wrap(), it allows the caller to use AEAD data (signed header/trailer) and allow greater controll over where the encrypted data is placed.

The maximum packet size is gss_context_stream_sizes.max_msg_size.

The caller needs provide the folloing buffers when using in conf_req_flag=1 mode:

- HEADER (of size gss_context_stream_sizes.header) { DATA or SIGN_ONLY } (optional, zero or more) PADDING (of size gss_context_stream_sizes.blocksize, if zero padding is zero, can be omitted) TRAILER (of size gss_context_stream_sizes.trailer)

- on DCE-RPC mode, the caller can skip PADDING and TRAILER if the DATA elements is padded to a block bountry and header is of at least size gss_context_stream_sizes.header + gss_context_stream_sizes.trailer.

HEADER, PADDING, TRAILER will be shrunken to the size required to transmit any of them too large.

To generate gss_wrap() compatible packets, use: HEADER | DATA | PADDING | TRAILER

When used in conf_req_flag=0,

- HEADER (of size gss_context_stream_sizes.header) { DATA or SIGN_ONLY } (optional, zero or more) PADDING (of size gss_context_stream_sizes.blocksize, if zero padding is zero, can be omitted) TRAILER (of size gss_context_stream_sizes.trailer)

The input sizes of HEADER, PADDING and TRAILER can be fetched using gss_wrap_iov_length() or gss_context_query_attributes().

GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL gss_wrap_iov_length | ( | OM_uint32 * | minor_status,
|  | gss_ctx_id_t | context_handle,
|  | int | conf_req_flag,
|  | gss_qop_t | qop_req,
|  | int * | conf_state,
|  | gss_iov_buffer_desc * | iov,
|  | int | iov_count |
| ) |  |  |

Update the length fields in iov buffer for the types:

- GSS_IOV_BUFFER_TYPE_HEADER
- GSS_IOV_BUFFER_TYPE_PADDING
- GSS_IOV_BUFFER_TYPE_TRAILER

Consider using gss_context_query_attributes() to fetch the data instead.

## Variable Documentation

gss_OID_desc GSSAPI_LIB_FUNCTION __gss_c_attr_stream_sizes_oid_desc

Initial value:

        {10, rk_UNCONST("\x2a\x86\x48\x86\xf7\x12\x01\x02\x01\x03")}

Query the context for parameters.

SSPI equivalent if this function is QueryContextAttributes.

- GSS_C_ATTR_STREAM_SIZES data is a gss_context_stream_sizes.