KRB5_AUTH_CONTEXT(3) NetBSD Library Functions Manual KRB5_AUTH_CONTEXT(3)
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
#include <krb5/krb5.h> krb5_error_code krb5_auth_con_init(krb5_context context, krb5_auth_context *auth_context); void krb5_auth_con_free(krb5_context context, krb5_auth_context auth_context); krb5_error_code krb5_auth_con_setflags(krb5_context context, krb5_auth_context auth_context, int32_t flags); krb5_error_code krb5_auth_con_getflags(krb5_context context, krb5_auth_context auth_context, int32_t *flags); krb5_error_code krb5_auth_con_addflags(krb5_context context, krb5_auth_context auth_context, int32_t addflags, int32_t *flags); krb5_error_code krb5_auth_con_removeflags(krb5_context context, krb5_auth_context auth_context, int32_t removelags, int32_t *flags); krb5_error_code krb5_auth_con_setaddrs(krb5_context context, krb5_auth_context auth_context, krb5_address *local_addr, krb5_address *remote_addr); krb5_error_code krb5_auth_con_getaddrs(krb5_context context, krb5_auth_context auth_context, krb5_address **local_addr, krb5_address **remote_addr); krb5_error_code krb5_auth_con_genaddrs(krb5_context context, krb5_auth_context auth_context, int fd, int flags); krb5_error_code krb5_auth_con_setaddrs_from_fd(krb5_context context, krb5_auth_context auth_context, void *p_fd); krb5_error_code krb5_auth_con_getkey(krb5_context context, krb5_auth_context auth_context, krb5_keyblock **keyblock); krb5_error_code krb5_auth_con_getlocalsubkey(krb5_context context, krb5_auth_context auth_context, krb5_keyblock **keyblock); krb5_error_code krb5_auth_con_getremotesubkey(krb5_context context, krb5_auth_context auth_context, krb5_keyblock **keyblock); krb5_error_code krb5_auth_con_generatelocalsubkey(krb5_context context, krb5_auth_context auth_context, krb5_keyblock, *key"); krb5_error_code krb5_auth_con_initivector(krb5_context context, krb5_auth_context auth_context); krb5_error_code krb5_auth_con_setivector(krb5_context context, krb5_auth_context *auth_context, krb5_pointer ivector); void krb5_free_authenticator(krb5_context context, krb5_authenticator *authenticator);
DESCRIPTION
The krb5_auth_context structure holds all context related to an authenti- cated connection, in a similar way to krb5_context that holds the context for the thread or process. krb5_auth_context is used by various func- tions 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 sub- keys), 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 modi- fies 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 parame- ters. KRB5_AUTH_CONTEXT_CLEAR_FORWARDED_CRED will force krb5_get_forwarded_creds() and krb5_fwd_tgt_creds() to create unencrypted ) KRB5_ENCTYPE_NULL) credentials. This is for use with old MIT server and JAVA based servers as they can't han- dle 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 compatibil- ity problems since not all versions of the heimdal supports time- less 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 authen- tication. 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 key- type 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(8) NetBSD 10.99 May 17, 2005 NetBSD 10.99
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