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ipa-kdb: Support re-signing PAC with different checksum

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Fixes: https://fedorahosted.org/freeipa/ticket/2122
This commit is contained in:
Simo Sorce 2011-11-22 18:03:10 -05:00
parent ac45a5eee8
commit ba2e357ba2
1 changed files with 52 additions and 2 deletions
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54
daemons/ipa-kdb/ipa_kdb_mspac.c
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@ -50,6 +50,12 @@ krb5int_find_authdata(krb5_context context,
#define krb5_find_authdata krb5int_find_authdata
#endif
#ifndef KRB5_PAC_SERVER_CHECKSUM
#define KRB5_PAC_SERVER_CHECKSUM 6
#endif
#ifndef KRB5_PAC_PRIVSVR_CHECKSUM
#define KRB5_PAC_PRIVSVR_CHECKSUM 6
#endif
static char *user_pac_attrs[] = {
"objectClass",
@ -552,6 +558,12 @@ static krb5_error_code ipadb_verify_pac(krb5_context context,
{
krb5_authdata **authdata = NULL;
krb5_error_code kerr;
krb5_ui_4 *buffer_types = NULL;
size_t num_buffers;
krb5_pac old_pac = NULL;
krb5_pac new_pac = NULL;
krb5_data data;
size_t i;
/* find the existing PAC, if present */
kerr = krb5_find_authdata(context, tgt_auth_data, NULL,
@ -573,16 +585,54 @@ static krb5_error_code ipadb_verify_pac(krb5_context context,
kerr = krb5_pac_parse(context,
authdata[0]->contents,
authdata[0]->length,
pac);
&old_pac);
if (kerr) {
goto done;
}
kerr = krb5_pac_verify(context, *pac, authtime,
kerr = krb5_pac_verify(context, old_pac, authtime,
client_princ, krbtgt_key, NULL);
if (kerr) {
goto done;
}
/* extract buffers and rebuilt pac from scratch so that when re-signing
* with a different cksum type does not cause issues due to mismatching
* signature buffer lengths */
kerr = krb5_pac_init(context, &new_pac);
if (kerr) {
goto done;
}
kerr = krb5_pac_get_types(context, old_pac, &num_buffers, &buffer_types);
if (kerr) {
goto done;
}
for (i = 0; i < num_buffers; i++) {
if (buffer_types[i] == KRB5_PAC_SERVER_CHECKSUM ||
buffer_types[i] == KRB5_PAC_PRIVSVR_CHECKSUM) {
continue;
}
kerr = krb5_pac_get_buffer(context, old_pac,
buffer_types[i], &data);
if (kerr == 0) {
kerr = krb5_pac_add_buffer(context, new_pac,
buffer_types[i], &data);
}
krb5_free_data_contents(context, &data);
if (kerr) {
krb5_pac_free(context, new_pac);
goto done;
}
}
*pac = new_pac;
done:
krb5_free_authdata(context, authdata);
krb5_pac_free(context, old_pac);
free(buffer_types);
return kerr;
}