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gss_accept_sec_context.3.gz

GSS_ACQUIRE_CRED(3) BSD Library Functions Manual GSS_ACQUIRE_CRED(3)

NAME
     gss_accept_sec_context, gss_acquire_cred, gss_add_cred,
     gss_add_oid_set_member, gss_canonicalize_name,
     gss_compare_name, gss_context_time, gss_create_empty_oid_set,
     gss_delete_sec_context, gss_display_name, gss_display_status,
     gss_duplicate_name, gss_export_name, gss_export_sec_context,
     gss_get_mic, gss_import_name, gss_import_sec_context,
     gss_indicate_mechs, gss_init_sec_context, gss_inquire_context,
     gss_inquire_cred, gss_inquire_cred_by_mech,
     gss_inquire_mechs_for_name, gss_inquire_names_for_mech,
     gss_krb5_ccache_name, gss_krb5_compat_des3_mic,
     gss_krb5_copy_ccache, gss_krb5_import_cred
     gsskrb5_extract_authz_data_from_sec_context,
     gsskrb5_register_acceptor_identity, gss_krb5_import_ccache,
     gss_krb5_get_tkt_flags, gss_process_context_token,
     gss_release_buffer, gss_release_cred, gss_release_name,
     gss_release_oid_set, gss_seal, gss_sign,
     gss_test_oid_set_member, gss_unseal, gss_unwrap, gss_verify,
     gss_verify_mic, gss_wrap, gss_wrap_size_limit — Generic Secu‐
     rity Service Application Program Interface library

LIBRARY
     GSS-API library (libgssapi, -lgssapi)

SYNOPSIS
     #include <gssapi.h>

     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);

     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);

     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);

     OM_uint32
     gss_add_oid_set_member(OM_uint32 * minor_status,
         const gss_OID member_oid, gss_OID_set * oid_set);

     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);

     OM_uint32
     gss_compare_name(OM_uint32 * minor_status,
         const gss_name_t name1, const gss_name_t name2,
         int * name_equal);

     OM_uint32
     gss_context_time(OM_uint32 * minor_status,
         const gss_ctx_id_t context_handle, OM_uint32 * time_rec);

     OM_uint32
     gss_create_empty_oid_set(OM_uint32 * minor_status,
         gss_OID_set * oid_set);

     OM_uint32
     gss_delete_sec_context(OM_uint32 * minor_status,
         gss_ctx_id_t * context_handle, gss_buffer_t output_token);

     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);

     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);

     OM_uint32
     gss_duplicate_name(OM_uint32 * minor_status,
         const gss_name_t src_name, gss_name_t * dest_name);

     OM_uint32
     gss_export_name(OM_uint32 * minor_status,
         const gss_name_t input_name, gss_buffer_t exported_name);

     OM_uint32
     gss_export_sec_context(OM_uint32 * minor_status,
         gss_ctx_id_t * context_handle,
         gss_buffer_t interprocess_token);

     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);

     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);

     OM_uint32
     gss_import_sec_context(OM_uint32 * minor_status,
         const gss_buffer_t interprocess_token,
         gss_ctx_id_t * context_handle);

     OM_uint32
     gss_indicate_mechs(OM_uint32 * minor_status,
         gss_OID_set * mech_set);

     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);

     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_context);

     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);

     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);

     OM_uint32
     gss_inquire_mechs_for_name(OM_uint32 * minor_status,
         const gss_name_t input_name, gss_OID_set * mech_types);

     OM_uint32
     gss_inquire_names_for_mech(OM_uint32 * minor_status,
         const gss_OID mechanism, gss_OID_set * name_types);

     OM_uint32
     gss_krb5_ccache_name(OM_uint32 *minor, const char *name,
         const char **old_name);

     OM_uint32
     gss_krb5_copy_ccache(OM_uint32 *minor, gss_cred_id_t cred,
         krb5_ccache out);

     OM_uint32
     gss_krb5_import_cred(OM_uint32 *minor_status, krb5_ccache id,
         krb5_principal keytab_principal, krb5_keytab keytab,
         gss_cred_id_t *cred);

     OM_uint32
     gss_krb5_compat_des3_mic(OM_uint32 * minor_status,
         gss_ctx_id_t context_handle, int onoff);

     OM_uint32
     gsskrb5_extract_authz_data_from_sec_context(OM_uint32 *minor_status,
         gss_ctx_id_t context_handle, int ad_type,
         gss_buffer_t ad_data);

     OM_uint32
     gsskrb5_register_acceptor_identity(const char *identity);

     OM_uint32
     gss_krb5_import_cache(OM_uint32 *minor, krb5_ccache id,
         krb5_keytab keytab, gss_cred_id_t *cred);

     OM_uint32
     gss_krb5_get_tkt_flags(OM_uint32 *minor_status,
         gss_ctx_id_t context_handle, OM_uint32 *tkt_flags);

     OM_uint32
     gss_process_context_token(OM_uint32 * minor_status,
         const gss_ctx_id_t context_handle,
         const gss_buffer_t token_buffer);

     OM_uint32
     gss_release_buffer(OM_uint32 * minor_status,
         gss_buffer_t buffer);

     OM_uint32
     gss_release_cred(OM_uint32 * minor_status,
         gss_cred_id_t * cred_handle);

     OM_uint32
     gss_release_name(OM_uint32 * minor_status,
         gss_name_t * input_name);

     OM_uint32
     gss_release_oid_set(OM_uint32 * minor_status,
         gss_OID_set * set);

     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_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_test_oid_set_member(OM_uint32 * minor_status,
         const gss_OID member, const gss_OID_set set,
         int * present);

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

     OM_uint32
     gss_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_verify_mic(OM_uint32 * minor_status,
         const gss_ctx_id_t context_handle,
         const gss_buffer_t message_buffer,
         const gss_buffer_t token_buffer, gss_qop_t * qop_state);

     OM_uint32
     gss_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);

     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);

DESCRIPTION
     Generic Security Service API (GSS-API) version 2, and its C
     binding, is described in RFC2743 and RFC2744.  Version 1 (dep‐
     recated) of the C binding is described in RFC1509.

     Heimdals GSS-API implementation supports the following mecha‐
     nisms

     ·   GSS_KRB5_MECHANISM

     ·   GSS_SPNEGO_MECHANISM

     GSS-API have generic name types that all mechanism are supposed
     to implement (if possible):

     ·   GSS_C_NT_USER_NAME

     ·   GSS_C_NT_MACHINE_UID_NAME

     ·   GSS_C_NT_STRING_UID_NAME

     ·   GSS_C_NT_HOSTBASED_SERVICE

     ·   GSS_C_NT_ANONYMOUS

     ·   GSS_C_NT_EXPORT_NAME

     GSS-API implementations that supports Kerberos 5 have some
     additional name types:

     ·   GSS_KRB5_NT_PRINCIPAL_NAME

     ·   GSS_KRB5_NT_USER_NAME

     ·   GSS_KRB5_NT_MACHINE_UID_NAME

     ·   GSS_KRB5_NT_STRING_UID_NAME

     In GSS-API, names have two forms, internal names and contiguous
     string names.

     ·   Internal name and mechanism name

         Internal names are implementation specific representation
         of a GSS-API name.  Mechanism names special form of inter‐
         nal names corresponds to one and only one mechanism.

         In GSS-API an internal name is stored in a gss_name_t.

     ·   Contiguous string name and exported name

         Contiguous string names are gssapi names stored in a OCTET
         STRING that together with a name type identifier (OID)
         uniquely specifies a gss-name.  A special form of the con‐
         tiguous string name is the exported name that have a OID
         embedded in the string to make it unique.  Exported name
         have the nametype GSS_C_NT_EXPORT_NAME.

         In GSS-API an contiguous string name is stored in a
         gss_buffer_t.

         Exported names also have the property that they are speci‐
         fied by the mechanism itself and compatible between
         diffrent GSS-API implementations.

ACCESS CONTROL
     There are two ways of comparing GSS-API names, either comparing
     two internal names with each other or two contiguous string
     names with either other.

     To compare two internal names with each other, import (if
     needed) the names with gss_import_name() into the GSS-API
     implementation and the compare the imported name with
     gss_compare_name().

     Importing names can be slow, so when its possible to store
     exported names in the access control list, comparing contiguous
     string name might be better.

     when comparing contiguous string name, first export them into a
     GSS_C_NT_EXPORT_NAME name with gss_export_name() and then com‐
     pare with memcmp(3).

     Note that there are might be a difference between the two meth‐
     ods of comparing names.  The first (using gss_compare_name())
     will compare to (unauthenticated) names are the same.  The sec‐
     ond will compare if a mechanism will authenticate them as the
     same principal.

     For example, if gss_import_name() name was used with
     GSS_C_NO_OID the default syntax is used for all mechanism the
     GSS-API implementation supports.  When compare the imported
     name of GSS_C_NO_OID it may match serveral mechanism names
     (MN).

     The resulting name from gss_display_name() must not be used for
     acccess control.

FUNCTIONS
     gss_display_name() takes the gss name in input_name and puts a
     printable form in output_name_buffer.  output_name_buffer
     should be freed when done using gss_release_buffer().
     output_name_type can either be NULL or a pointer to a gss_OID
     and will in the latter case contain the OID type of the name.
     The name must only be used for printing.  If access control is
     needed, see section ACCESS CONTROL.

     gss_inquire_context() returns information about the context.
     Information is available even after the context have expired.
     lifetime_rec argument is set to GSS_C_INDEFINITE (dont expire)
     or the number of seconds that the context is still valid.  A
     value of 0 means that the context is expired.  mech_type argu‐
     ment should be considered readonly and must not be released.
     src_name and dest_name() are both mechanims names and must be
     released with gss_release_name() when no longer used.

     gss_context_time will return the amount of time (in seconds) of
     the context is still valid.  If its expired time_rec will be
     set to 0 and GSS_S_CONTEXT_EXPIRED returned.

     gss_sign(), gss_verify(), gss_seal(), and gss_unseal() are part
     of the GSS-API V1 interface and are obsolete.  The functions
     should not be used for new applications.  They are provided so
     that version 1 applications can link against the library.

EXTENSIONS
     gss_krb5_ccache_name() sets the internal kerberos 5 credential
     cache name to name.  The old name is returned in old_name, and
     must not be freed.  The data allocated for old_name is free
     upon next call to gss_krb5_ccache_name().  This function is not
     threadsafe if old_name argument is used.

     gss_krb5_copy_ccache() will extract the krb5 credentials that
     are transferred from the initiator to the acceptor when using
     token delegation in the Kerberos mechanism.  The acceptor
     receives the delegated token in the last argument to
     gss_accept_sec_context().

     gss_krb5_import_cred() will import the krb5 credentials (both
     keytab and/or credential cache) into gss credential so it can
     be used withing GSS-API.  The ccache is copied by reference and
     thus shared, so if the credential is destroyed with
     krb5_cc_destroy, all users of thep gss_cred_id_t returned by
     gss_krb5_import_ccache() will fail.

     gsskrb5_register_acceptor_identity() sets the Kerberos 5 file‐
     based keytab that the acceptor will use.  The identifier is the
     file name.

     gsskrb5_extract_authz_data_from_sec_context() extracts the Ker‐
     beros authorizationdata that may be stored within the context.
     Tha caller must free the returned buffer ad_data with
     gss_release_buffer() upon success.

     gss_krb5_get_tkt_flags() return the ticket flags for the ker‐
     beros ticket receive when authenticating the initiator.  Only
     valid on the acceptor context.

     gss_krb5_compat_des3_mic() turns on or off the compatibility
     with older version of Heimdal using des3 get and verify mic,
     this is way to programmatically set the [gssapi]broken_des3_mic
     and [gssapi]correct_des3_mic flags (see COMPATIBILITY section
     in gssapi(3)).  If the CPP symbol GSS_C_KRB5_COMPAT_DES3_MIC is
     present, gss_krb5_compat_des3_mic() exists.
     gss_krb5_compat_des3_mic() will be removed in a later version
     of the GSS-API library.

SEE ALSO
     gssapi(3), krb5(3), krb5_ccache(3), kerberos(8)

HEIMDAL                   October 26, 2005                   HEIMDAL
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