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krb5: krb5_cc_ops backward compatibility and extensibility

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The krb5_cc_ops structure is an extensible structure to which new
functionality has been added over the years.

Version zero was the original.  It included all functions up to
and including get_default_name().

Version one added set_default().

Version two added lastchange().

Version three added set_kdc_offset() and get_kdc_offset().

Version four broke compatibility by modifying the signatures
of get_name() and resolve().   This was in change
7bf4d76e75 ("krb5: Improve cccol sub
naming; add gss_store_cred_into2()").

Version five restores the original signatures of get_name()
and resolve() and introduces get_name_2() and resolve_2() that
provide the additional cccol functionality.

This change

 * introduces version five
 * documents which functions are part of each version
 * replaces KRB5_CC_OPS_VERSION with KRB5_CC_OPS_VERSION_0,
   KRB5_CC_OPS_VERSION_1, KRB5_CC_OPS_VERSION_2, KRB5_CC_OPS_VERSION_3,
   and KRB5_CC_OPS_VERSION_5.  KRB5_CC_OPS_VERSION_4 is skipped
   because of the aforementioned breakage.
 * compatibility logic is added to permit ccache plugins to implement
   any of version one, two, three, five or a future version.
 * all in-tree krb5_cc_ops implementations are updated to version 5.

Change-Id: Iadfce01d10834bc6151939e4d9d196f03001626e
This commit is contained in:
Jeffrey Altman
2020-05-27 22:19:13 -04:00
committed by Nico Williams
parent 33bb2479b9
commit d84512b8d2
10 changed files with 156 additions and 109 deletions
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20
lib/krb5/acache.c
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@@ -444,11 +444,11 @@ get_cc_name(krb5_acc *a)
static krb5_error_code KRB5_CALLCONV
acc_get_name(krb5_context context,
krb5_ccache id,
const char **name,
const char **colname,
const char **subsidiary)
acc_get_name_2(krb5_context context,
krb5_ccache id,
const char **name,
const char **colname,
const char **subsidiary)
{
krb5_error_code ret = 0;
krb5_acc *a = ACACHE(id);
@@ -523,7 +523,7 @@ acc_alloc(krb5_context context, krb5_ccache *id)
}
static krb5_error_code KRB5_CALLCONV
acc_resolve(krb5_context context, krb5_ccache *id, const char *res, const char *sub)
acc_resolve_2(krb5_context context, krb5_ccache *id, const char *res, const char *sub)
{
krb5_error_code ret;
cc_time_t offset;
@@ -1095,10 +1095,10 @@ acc_lastchange(krb5_context context, krb5_ccache id, krb5_timestamp *mtime)
*/
KRB5_LIB_VARIABLE const krb5_cc_ops krb5_acc_ops = {
KRB5_CC_OPS_VERSION,
KRB5_CC_OPS_VERSION_5,
"API",
acc_get_name,
acc_resolve,
NULL,
NULL,
acc_gen_new,
acc_initialize,
acc_destroy,
@@ -1121,6 +1121,8 @@ KRB5_LIB_VARIABLE const krb5_cc_ops krb5_acc_ops = {
acc_lastchange,
NULL,
NULL,
acc_get_name_2,
acc_resolve_2
};
#endif