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eap: check MTU when loading identity

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If the MTU was set very low an identity could exceed the maximum.
This commit is contained in:
James Prestwood 2020-03-06 09:48:41 -08:00 committed by Denis Kenzior
parent 53ea9adfb5
commit 77cfb615e5
1 changed files with 10 additions and 3 deletions
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13
src/eap.c
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@ -568,10 +568,17 @@ bool eap_load_settings(struct eap_state *eap, struct l_settings *settings,
* octets. Support for an NAI length of 253 octets is RECOMMENDED.
* ...
* RADIUS is unable to support NAI lengths beyond 253 octets
*
* We also need to fail if the identity is too large for the set MTU
* size minus 5 (header).
*/
if (eap->identity && strlen(eap->identity) > 253) {
l_error("Identity is too long");
goto err;
if (eap->identity) {
size_t id_len = strlen(eap->identity);
if (id_len > 253 || id_len > eap->mtu - 5) {
l_error("Identity is too long");
goto err;
}
}
return true;