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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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30
lib/krb5/scache.c
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@@ -566,11 +566,11 @@ bind_principal(krb5_context context,
*/
static krb5_error_code KRB5_CALLCONV
scc_get_name(krb5_context context,
krb5_ccache id,
const char **name,
const char **file,
const char **sub)
scc_get_name_2(krb5_context context,
krb5_ccache id,
const char **name,
const char **file,
const char **sub)
{
if (name)
*name = SCACHE(id)->name;
@@ -582,10 +582,10 @@ scc_get_name(krb5_context context,
}
static krb5_error_code KRB5_CALLCONV
scc_resolve(krb5_context context,
krb5_ccache *id,
const char *res,
const char *sub)
scc_resolve_2(krb5_context context,
krb5_ccache *id,
const char *res,
const char *sub)
{
krb5_error_code ret;
krb5_scache *s;
@@ -1351,7 +1351,7 @@ again:
ret = _krb5_cc_allocate(context, &krb5_scc_ops, id);
if (ret == 0)
ret = scc_resolve(context, id, ctx->file, name);
ret = scc_resolve_2(context, id, ctx->file, name);
if (ret) {
free(*id);
*id = NULL;
@@ -1485,10 +1485,10 @@ scc_set_default(krb5_context context, krb5_ccache id)
*/
KRB5_LIB_VARIABLE const krb5_cc_ops krb5_scc_ops = {
KRB5_CC_OPS_VERSION,
KRB5_CC_OPS_VERSION_5,
"SCC",
scc_get_name,
scc_resolve,
NULL,
NULL,
scc_gen_new,
scc_initialize,
scc_destroy,
@@ -1510,7 +1510,9 @@ KRB5_LIB_VARIABLE const krb5_cc_ops krb5_scc_ops = {
scc_set_default,
NULL,
NULL,
NULL
NULL,
scc_get_name_2,
scc_resolve_2
};
#endif