man krb5_auth_setremoteseqnumber (Fonctions bibliothèques) - krb5_auth_con_addflags ,

NAME

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

LIBRARY

Kerberos 5 Library (libkrb5, -lkrb5)

SYNOPSIS

krb5_context contextkrb5_auth_context *auth_contextkrb5_context contextkrb5_auth_context auth_contextkrb5_context contextkrb5_auth_context auth_contextint32_t flagskrb5_context contextkrb5_auth_context auth_contextint32_t *flagskrb5_context contextkrb5_auth_context auth_contextint32_t addflagsint32_t *flagskrb5_context contextkrb5_auth_context auth_contextint32_t removelagsint32_t *flagskrb5_context contextkrb5_auth_context auth_contextkrb5_address *local_addrkrb5_address *remote_addrkrb5_context contextkrb5_auth_context auth_contextkrb5_address **local_addrkrb5_address **remote_addrkrb5_context contextkrb5_auth_context auth_contextint fdint flagskrb5_context contextkrb5_auth_context auth_contextvoid *p_fdkrb5_context contextkrb5_auth_context auth_contextkrb5_keyblock **keyblockkrb5_context contextkrb5_auth_context auth_contextkrb5_keyblock **keyblockkrb5_context contextkrb5_auth_context auth_contextkrb5_keyblock **keyblockkrb5_context contextkrb5_auth_context auth_contextkrb5_keyblock *key"krb5_context contextkrb5_auth_context auth_contextkrb5_context contextkrb5_auth_context *auth_contextkrb5_pointer ivectorkrb5_context contextkrb5_authenticator *authenticator

DESCRIPTION

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:

KRB5_AUTH_CONTEXT_DO_SEQUENCE
Generate and check sequence-number on each packet.
KRB5_AUTH_CONTEXT_DO_TIME
Check timestamp on incoming packets.
KRB5_AUTH_CONTEXT_RET_SEQUENCE , KRB5_AUTH_CONTEXT_RET_TIME
Return sequence numbers and time stamps in the outdata parameters.
KRB5_AUTH_CONTEXT_CLEAR_FORWARDED_CRED
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() 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 address.

krb5_auth_con_setaddrs_from_fd fetches the addresses from a file descriptor.

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:

KRB5_AUTH_CONTEXT_GENERATE_LOCAL_ADDR
fetches the local address from fd .
KRB5_AUTH_CONTEXT_GENERATE_REMOTE_ADDR
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_setuserkey .

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 counter.

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 replay-cache.

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 ivector .

krb5_free_authenticator free the content of authenticator and authenticator itself.

SEE ALSO

krb5_context(3) ,kerberos()