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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/dcache.c
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@@ -244,11 +244,11 @@ get_default_cache(krb5_context context, krb5_dcache *dc,
static krb5_error_code KRB5_CALLCONV
dcc_get_name(krb5_context context,
krb5_ccache id,
const char **name,
const char **dir,
const char **sub)
dcc_get_name_2(krb5_context context,
krb5_ccache id,
const char **name,
const char **dir,
const char **sub)
{
krb5_dcache *dc = DCACHE(id);
@@ -329,10 +329,10 @@ get_default_dir(krb5_context context, char **res)
}
static krb5_error_code KRB5_CALLCONV
dcc_resolve(krb5_context context,
krb5_ccache *id,
const char *res,
const char *sub)
dcc_resolve_2(krb5_context context,
krb5_ccache *id,
const char *res,
const char *sub)
{
krb5_error_code ret;
krb5_dcache *dc = NULL;
@@ -505,7 +505,7 @@ dcc_gen_new(krb5_context context, krb5_ccache *id)
if (ret == 0 && (fd = mkstemp(name + sizeof("DIR::") - 1)) == -1)
ret = errno;
if (ret == 0)
ret = dcc_resolve(context, id, name + sizeof("DIR:") - 1, NULL);
ret = dcc_resolve_2(context, id, name + sizeof("DIR:") - 1, NULL);
free(def_dir);
free(name);
@@ -824,10 +824,10 @@ dcc_get_kdc_offset(krb5_context context, krb5_ccache id, krb5_deltat *kdc_offset
*/
KRB5_LIB_VARIABLE const krb5_cc_ops krb5_dcc_ops = {
KRB5_CC_OPS_VERSION,
KRB5_CC_OPS_VERSION_5,
"DIR",
dcc_get_name,
dcc_resolve,
NULL,
NULL,
dcc_gen_new,
dcc_initialize,
dcc_destroy,
@@ -849,5 +849,7 @@ KRB5_LIB_VARIABLE const krb5_cc_ops krb5_dcc_ops = {
dcc_set_default,
dcc_lastchange,
dcc_set_kdc_offset,
dcc_get_kdc_offset
dcc_get_kdc_offset,
dcc_get_name_2,
dcc_resolve_2
};