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     krb5_auth_con_addflags, krb5_auth_con_free, krb5_auth_con_genaddrs,
     krb5_auth_con_generatelocalsubkey, krb5_auth_con_getaddrs,
     krb5_auth_con_getauthenticator, krb5_auth_con_getflags,
     krb5_auth_con_getkey, krb5_auth_con_getlocalsubkey,
     krb5_auth_con_getrcache, krb5_auth_con_getremotesubkey,
     krb5_auth_con_getuserkey, krb5_auth_con_init, krb5_auth_con_initivector,
     krb5_auth_con_removeflags, krb5_auth_con_setaddrs,
     krb5_auth_con_setaddrs_from_fd, krb5_auth_con_setflags,
     krb5_auth_con_setivector, krb5_auth_con_setkey,
     krb5_auth_con_setlocalsubkey, krb5_auth_con_setrcache,
     krb5_auth_con_setremotesubkey, krb5_auth_con_setuserkey,
     krb5_auth_context, krb5_auth_getcksumtype, krb5_auth_getkeytype,
     krb5_auth_getlocalseqnumber, krb5_auth_getremoteseqnumber,
     krb5_auth_setcksumtype, krb5_auth_setkeytype,
     krb5_auth_setlocalseqnumber, krb5_auth_setremoteseqnumber,
     krb5_free_authenticator - manage authentication on connection level


     Kerberos 5 Library (libkrb5, -lkrb5)


     #include <krb5.h>

     krb5_auth_con_init(krb5_context context,
             krb5_auth_context *auth_context);

     krb5_auth_con_free(krb5_context context, krb5_auth_context auth_context);

     krb5_auth_con_setflags(krb5_context context,
             krb5_auth_context auth_context, int32_t flags);

     krb5_auth_con_getflags(krb5_context context,
             krb5_auth_context auth_context, int32_t *flags);

     krb5_auth_con_addflags(krb5_context context,
             krb5_auth_context auth_context, int32_t addflags,
             int32_t *flags);

     krb5_auth_con_removeflags(krb5_context context,
             krb5_auth_context auth_context, int32_t removelags,
             int32_t *flags);

     krb5_auth_con_setaddrs(krb5_context context,
             krb5_auth_context auth_context, krb5_address *local_addr,
             krb5_address *remote_addr);

     krb5_auth_con_getaddrs(krb5_context context,
             krb5_auth_context auth_context, krb5_address **local_addr,
             krb5_address **remote_addr);

     krb5_auth_con_genaddrs(krb5_context context,
             krb5_auth_context auth_context, int fd, int flags);

     krb5_auth_con_setaddrs_from_fd(krb5_context context,
             krb5_auth_context auth_context, void *p_fd);

     krb5_auth_con_getkey(krb5_context context,
             krb5_auth_context auth_context, krb5_keyblock **keyblock);

     krb5_auth_con_getlocalsubkey(krb5_context context,
             krb5_auth_context auth_context, krb5_keyblock **keyblock);

     krb5_auth_con_getremotesubkey(krb5_context context,
             krb5_auth_context auth_context, krb5_keyblock **keyblock);

     krb5_auth_con_generatelocalsubkey(krb5_context context,
             krb5_auth_context auth_context, krb5_keyblock, *key");

     krb5_auth_con_initivector(krb5_context context,
             krb5_auth_context auth_context);

     krb5_auth_con_setivector(krb5_context context,
             krb5_auth_context *auth_context, krb5_pointer ivector);

     krb5_free_authenticator(krb5_context context,
             krb5_authenticator *authenticator);


     The krb5_auth_context structure holds all context related to an
     authenticated connection, in a similar way to krb5_context that holds the
     context for the thread or process.  krb5_auth_context is used by various
     functions that are directly related to authentication between the
     server/client. Example of data that this structure contains are various
     flags, addresses of client and server, port numbers, keyblocks (and
     subkeys), sequence numbers, replay cache, and checksum-type.

     krb5_auth_con_init() allocates and initializes the krb5_auth_context
     structure. Default values can be changed with
     krb5_auth_con_setcksumtype() and krb5_auth_con_setflags().  The
     auth_context structure must be freed by krb5_auth_con_free().

     krb5_auth_con_getflags(), krb5_auth_con_setflags(),
     krb5_auth_con_addflags() and krb5_auth_con_removeflags() gets and
     modifies the flags for a krb5_auth_context structure. Possible flags to
     set are:

             Generate and check sequence-number on each packet.

             Check timestamp on incoming packets.

             Return sequence numbers and time stamps in the outdata

             will force krb5_get_forwarded_creds() and krb5_fwd_tgt_creds() to
             create unencrypted ) ENCTYPE_NULL) credentials.  This is for use
             with old MIT server and JAVA based servers as they can’t handle
             encrypted KRB-CRED.  Note that sending such KRB-CRED is clear
             exposes crypto keys and tickets and is insecure, make sure the
             packet is encrypted in the protocol.  krb5_rd_cred(3),
             krb5_rd_priv(3), krb5_rd_safe(3), krb5_mk_priv(3) and
             krb5_mk_safe(3).  Setting this flag requires that parameter to be
             passed to these functions.

             The flags KRB5_AUTH_CONTEXT_DO_TIME also modifies the behavior
             the function krb5_get_forwarded_creds() by removing the timestamp
             in the forward credential message, this have backward
             compatibility problems since not all versions of the heimdal
             supports timeless credentional messages.  Is very useful since it
             always the sender of the message to cache forward message and
             thus avoiding a round trip to the KDC for each time a credential
             is forwarded.  The same functionality can be obtained by using
             address-less tickets.

     krb5_auth_con_setaddrs(), krb5_auth_con_setaddrs_from_fd() and
     krb5_auth_con_getaddrs() gets and sets the addresses that are checked
     when a packet is received.  It is mandatory to set an address for the
     remote host. If the local address is not set, it iss deduced from the
     underlaying operating system.  krb5_auth_con_getaddrs() will call
     krb5_free_address() on any address that is passed in local_addr or
     remote_addr.  krb5_auth_con_setaddr() allows passing in a NULL pointer as
     local_addr and remote_addr, in that case it will just not set that

     krb5_auth_con_setaddrs_from_fd() fetches the addresses from a file

     krb5_auth_con_genaddrs() fetches the address information from the given
     file descriptor fd depending on the bitmap argument flags.

     Possible values on flags are:

             fetches the local address from fd.

             fetches the remote address from fd.

     krb5_auth_con_setkey(), krb5_auth_con_setuserkey() and
     krb5_auth_con_getkey() gets and sets the key used for this auth context.
     The keyblock returned by krb5_auth_con_getkey() should be freed with
     krb5_free_keyblock().  The keyblock send into krb5_auth_con_setkey() is
     copied into the krb5_auth_context, and thus no special handling is
     needed.  NULL is not a valid keyblock to krb5_auth_con_setkey().

     krb5_auth_con_setuserkey() is only useful when doing user to user
     authentication.  krb5_auth_con_setkey() is equivalent to

     krb5_auth_con_getlocalsubkey(), krb5_auth_con_setlocalsubkey(),
     krb5_auth_con_getremotesubkey() and krb5_auth_con_setremotesubkey() gets
     and sets the keyblock for the local and remote subkey.  The keyblock
     returned by krb5_auth_con_getlocalsubkey() and
     krb5_auth_con_getremotesubkey() must be freed with krb5_free_keyblock().

     krb5_auth_setcksumtype() and krb5_auth_getcksumtype() sets and gets the
     checksum type that should be used for this connection.

     krb5_auth_con_generatelocalsubkey() generates a local subkey that have
     the same encryption type as key.

     krb5_auth_getremoteseqnumber() krb5_auth_setremoteseqnumber(),
     krb5_auth_getlocalseqnumber() and krb5_auth_setlocalseqnumber() gets and
     sets the sequence-number for the local and remote sequence-number

     krb5_auth_setkeytype() and krb5_auth_getkeytype() gets and gets the
     keytype of the keyblock in krb5_auth_context.

     krb5_auth_con_getauthenticator() Retrieves the authenticator that was
     used during mutual authentication. The authenticator returned should be
     freed by calling krb5_free_authenticator().

     krb5_auth_con_getrcache() and krb5_auth_con_setrcache() gets and sets the

     krb5_auth_con_initivector() allocates memory for and zeros the initial
     vector in the auth_context keyblock.

     krb5_auth_con_setivector() sets the i_vector portion of auth_context to

     krb5_free_authenticator() free the content of authenticator and
     authenticator itself.


     krb5_context(3), kerberos(8)