krb5_credential(3)

NAME
krb5_credential - Heimdal Kerberos 5 credential handing functions

SYNOPSIS

  Functions
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_fwd_tgt_creds (krb5_context context, krb5_auth_context auth_context, const char *hostname, krb5_principal client, krb5_principal server, krb5_ccache ccache, int forwardable, krb5_data *out_data)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_get_forwarded_creds (krb5_context context, krb5_auth_context auth_context, krb5_ccache ccache, krb5_flags flags, const char *hostname, krb5_creds *in_creds, krb5_data *out_data)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_get_init_creds_opt_alloc (krb5_context context, krb5_get_init_creds_opt **opt)
KRB5_LIB_FUNCTION void KRB5_LIB_CALL krb5_get_init_creds_opt_free (krb5_context context, krb5_get_init_creds_opt *opt)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_init_creds_init (krb5_context context, krb5_principal client, krb5_prompter_fct prompter, void *prompter_data, krb5_deltat start_time, krb5_get_init_creds_opt *options, krb5_init_creds_context *rctx)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_init_creds_set_service (krb5_context context, krb5_init_creds_context ctx, const char *service)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_init_creds_set_password (krb5_context context, krb5_init_creds_context ctx, const char *password)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_init_creds_set_keytab (krb5_context context, krb5_init_creds_context ctx, krb5_keytab keytab)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_init_creds_step (krb5_context context, krb5_init_creds_context ctx, krb5_data *in, krb5_data *out, krb5_krbhst_info *hostinfo, unsigned int *flags)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_init_creds_get_error (krb5_context context, krb5_init_creds_context ctx, KRB_ERROR *error)
KRB5_LIB_FUNCTION void KRB5_LIB_CALL krb5_init_creds_free (krb5_context context, krb5_init_creds_context ctx)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_init_creds_get (krb5_context context, krb5_init_creds_context ctx)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_get_init_creds_password (krb5_context context, krb5_creds *creds, krb5_principal client, const char *password, krb5_prompter_fct prompter, void *data, krb5_deltat start_time, const char *in_tkt_service, krb5_get_init_creds_opt *options)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_get_init_creds_keyblock (krb5_context context, krb5_creds *creds, krb5_principal client, krb5_keyblock *keyblock, krb5_deltat start_time, const char *in_tkt_service, krb5_get_init_creds_opt *options)
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_get_init_creds_keytab (krb5_context context, krb5_creds *creds, krb5_principal client, krb5_keytab keytab, krb5_deltat start_time, const char *in_tkt_service, krb5_get_init_creds_opt *options)

Detailed Description

Function Documentation

  KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_fwd_tgt_creds (krb5_context context, krb5_auth_context auth_context, const char * hostname, krb5_principal client, krb5_principal server, krb5_ccache ccache, int forwardable, krb5_data * out_data)
Forward credentials for client to host hostname , making them forwardable if forwardable, and returning the blob of data to sent in out_data. If hostname == NULL, pick it from server.

Parameters
    context A kerberos 5 context.
    auth_context the auth context with the key to encrypt the out_data.
    hostname the host to forward the tickets too.
    client the client to delegate from.
    server the server to delegate the credential too.
    ccache credential cache to use.
    forwardable make the forwarded ticket forwabledable.
    out_data the resulting credential.

Returns
    Return an error code or 0.

  KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_get_forwarded_creds (krb5_context context, krb5_auth_context auth_context, krb5_ccache ccache, krb5_flags flags, const char * hostname, krb5_creds * in_creds, krb5_data * out_data)
Gets tickets forwarded to hostname. If the tickets that are forwarded are address-less, the forwarded tickets will also be address-less.

If the ticket have any address, hostname will be used for figure out the address to forward the ticket too. This since this might use DNS, its insecure and also doesn't represent configured all addresses of the host. For example, the host might have two adresses, one IPv4 and one IPv6 address where the later is not published in DNS. This IPv6 address might be used communications and thus the resulting ticket useless.

Parameters
    context A kerberos 5 context.
    auth_context the auth context with the key to encrypt the out_data.
    ccache credential cache to use
    flags the flags to control the resulting ticket flags
    hostname the host to forward the tickets too.
    in_creds the in client and server ticket names. The client and server components forwarded to the remote host.
    out_data the resulting credential.

Returns
    Return an error code or 0.

Some older of the MIT gssapi library used clear-text tickets (warped inside AP-REQ encryption), use the krb5_auth_context flag KRB5_AUTH_CONTEXT_CLEAR_FORWARDED_CRED to support those tickets. The session key is used otherwise to encrypt the forwarded ticket.

  KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_get_init_creds_keyblock (krb5_context context, krb5_creds * creds, krb5_principal client, krb5_keyblock * keyblock, krb5_deltat start_time, const char * in_tkt_service, krb5_get_init_creds_opt * options)
Get new credentials using keyblock.

  KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_get_init_creds_keytab (krb5_context context, krb5_creds * creds, krb5_principal client, krb5_keytab keytab, krb5_deltat start_time, const char * in_tkt_service, krb5_get_init_creds_opt * options)
Get new credentials using keytab.

  KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_get_init_creds_opt_alloc (krb5_context context, krb5_get_init_creds_opt ** opt)
Allocate a new krb5_get_init_creds_opt structure, free with krb5_get_init_creds_opt_free().

  KRB5_LIB_FUNCTION void KRB5_LIB_CALL krb5_get_init_creds_opt_free (krb5_context context, krb5_get_init_creds_opt * opt)
Free krb5_get_init_creds_opt structure.

  KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_get_init_creds_password (krb5_context context, krb5_creds * creds, krb5_principal client, const char * password, krb5_prompter_fct prompter, void * data, krb5_deltat start_time, const char * in_tkt_service, krb5_get_init_creds_opt * options)
Get new credentials using password.

  KRB5_LIB_FUNCTION void KRB5_LIB_CALL krb5_init_creds_free (krb5_context context, krb5_init_creds_context ctx)
Free the krb5_init_creds_context allocated by krb5_init_creds_init().

Parameters
    context A Kerberos 5 context.
    ctx The krb5_init_creds_context to free.

  KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_init_creds_get (krb5_context context, krb5_init_creds_context ctx)
Get new credentials as setup by the krb5_init_creds_context.

Parameters
    context A Kerberos 5 context.
    ctx The krb5_init_creds_context to process.

  KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_init_creds_get_error (krb5_context context, krb5_init_creds_context ctx, KRB_ERROR * error)
Get the last error from the transaction.

Returns
    Returns 0 or an error code

  KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_init_creds_init (krb5_context context, krb5_principal client, krb5_prompter_fct prompter, void * prompter_data, krb5_deltat start_time, krb5_get_init_creds_opt * options, krb5_init_creds_context * rctx)
Start a new context to get a new initial credential.

Parameters
    context A Kerberos 5 context.
    client The Kerberos principal to get the credential for, if NULL is given, the default principal is used as determined by krb5_get_default_principal().
    prompter
    prompter_data
    start_time the time the ticket should start to be valid or 0 for now.
    options a options structure, can be NULL for default options.
    rctx A new allocated free with krb5_init_creds_free().

Returns
    0 for success or an Kerberos 5 error code, see krb5_get_error_message().

  KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_init_creds_set_keytab (krb5_context context, krb5_init_creds_context ctx, krb5_keytab keytab)
Set the keytab to use for authentication.

Parameters
    context a Kerberos 5 context.
    ctx ctx krb5_init_creds_context context.
    keytab the keytab to read the key from.

Returns
    0 for success, or an Kerberos 5 error code, see krb5_get_error_message().

  KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_init_creds_set_password (krb5_context context, krb5_init_creds_context ctx, const char * password)
Sets the password that will use for the request.

Parameters
    context a Kerberos 5 context.
    ctx ctx krb5_init_creds_context context.
    password the password to use.

Returns
    0 for success, or an Kerberos 5 error code, see krb5_get_error_message().

  KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_init_creds_set_service (krb5_context context, krb5_init_creds_context ctx, const char * service)
Sets the service that the is requested. This call is only neede for special initial tickets, by default the a krbtgt is fetched in the default realm.

Parameters
    context a Kerberos 5 context.
    ctx a krb5_init_creds_context context.
    service the service given as a string, for example 'kadmind/admin'. If NULL, the default krbtgt in the clients realm is set.

Returns
    0 for success, or an Kerberos 5 error code, see krb5_get_error_message().

  KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL krb5_init_creds_step (krb5_context context, krb5_init_creds_context ctx, krb5_data * in, krb5_data * out, krb5_krbhst_info * hostinfo, unsigned int * flags)
The core loop if krb5_get_init_creds() function family. Create the packets and have the caller send them off to the KDC.

If the caller want all work been done for them, use krb5_init_creds_get() instead.

Parameters
    context a Kerberos 5 context.
    ctx ctx krb5_init_creds_context context.
    in input data from KDC, first round it should be reset by krb5_data_zer().
    out reply to KDC.
    hostinfo KDC address info, first round it can be NULL.
    flags status of the round, if KRB5_INIT_CREDS_STEP_FLAG_CONTINUE is set, continue one more round.

Returns
    0 for success, or an Kerberos 5 error code, see krb5_get_error_message().

Author

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