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kadmin: do_ext_keytab add bogus key warnings

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If any of the keys returned by kadmin are the magic bogus key
generate a warning to the user that they are missing the git-keys
privilege.

Change-Id: I235b87eeb2f81e8fd8c8481154d613e92a7e11e2
This commit is contained in:
Nicolas Williams
2015-03-12 22:24:24 -04:00
committed by Jeffrey Altman
parent 1bfb759a64
commit dcbe8ae73b
1 changed files with 17 additions and 4 deletions
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21
kadmin/ext.c
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@@ -48,12 +48,17 @@ do_ext_keytab(krb5_principal principal, void *data)
krb5_keyblock *k = NULL;
size_t i;
int n_k = 0;
char *unparsed = NULL;
ret = kadm5_get_principal(kadm_handle, principal, &princ,
KADM5_PRINCIPAL|KADM5_KVNO|KADM5_KEY_DATA);
if (ret)
return ret;
ret = krb5_unparse_name(context, principal, &unparsed);
if (ret)
goto out;
if (princ.n_key_data) {
keys = calloc(sizeof(*keys), princ.n_key_data);
if (keys == NULL) {
@@ -62,15 +67,22 @@ do_ext_keytab(krb5_principal principal, void *data)
}
for (i = 0; i < princ.n_key_data; i++) {
krb5_key_data *kd = &princ.key_data[i];
int warned = 0;
/*
* If the kadm5 client princ lacks get-keys then it may get
* bogus keys four bytes long.
*/
if (kd->key_data_length[0] == sizeof (KADM5_BOGUS_KEY_DATA) - 1 &&
memcmp(kd->key_data_contents[0], KADM5_BOGUS_KEY_DATA,
kd->key_data_length[0]) == 0)
if ((kd->key_data_length[0] == sizeof (KADM5_BOGUS_KEY_DATA) - 1)
&& (ct_memcmp(kd->key_data_contents[0], KADM5_BOGUS_KEY_DATA,
kd->key_data_length[0]) == 0)) {
if (!warned) {
krb5_warnx(context, "user lacks get-keys privilege for %s",
unparsed);
warned = 1;
}
continue;
}
keys[i].principal = princ.principal;
keys[i].vno = kd->key_data_kvno;
@@ -104,7 +116,7 @@ do_ext_keytab(krb5_principal principal, void *data)
for (i = 0; i < n_k; i++) {
ret = krb5_kt_add_entry(context, e->keytab, &keys[i]);
if (ret)
krb5_warn(context, ret, "krb5_kt_add_entry(%d)", i);
krb5_warn(context, ret, "krb5_kt_add_entry(%lu)", (unsigned long)i);
}
out:
@@ -113,6 +125,7 @@ do_ext_keytab(krb5_principal principal, void *data)
memset(k, 0, n_k * sizeof(*k));
free(k);
}
free(unparsed);
free(keys);
return 0;
}