diff options
Diffstat (limited to 'package/network/services/ppp/patches/702-pppd-Ignore-received-EAP-messages-when-not-doing-EAP.patch')
| -rw-r--r-- | package/network/services/ppp/patches/702-pppd-Ignore-received-EAP-messages-when-not-doing-EAP.patch | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/package/network/services/ppp/patches/702-pppd-Ignore-received-EAP-messages-when-not-doing-EAP.patch b/package/network/services/ppp/patches/702-pppd-Ignore-received-EAP-messages-when-not-doing-EAP.patch new file mode 100644 index 0000000000..7286d81a56 --- /dev/null +++ b/package/network/services/ppp/patches/702-pppd-Ignore-received-EAP-messages-when-not-doing-EAP.patch @@ -0,0 +1,61 @@ +From 8d45443bb5c9372b4c6a362ba2f443d41c5636af Mon Sep 17 00:00:00 2001 +From: Paul Mackerras <paulus@ozlabs.org> +Date: Mon, 3 Feb 2020 16:31:42 +1100 +Subject: [PATCH] pppd: Ignore received EAP messages when not doing EAP + +This adds some basic checks to the subroutines of eap_input to check +that we have requested or agreed to doing EAP authentication before +doing any processing on the received packet. The motivation is to +make it harder for a malicious peer to disrupt the operation of pppd +by sending unsolicited EAP packets. Note that eap_success() already +has a check that the EAP client state is reasonable, and does nothing +(apart from possibly printing a debug message) if not. + +Signed-off-by: Paul Mackerras <paulus@ozlabs.org> +--- + pppd/eap.c | 18 ++++++++++++++++++ + 1 file changed, 18 insertions(+) + +diff --git a/pppd/eap.c b/pppd/eap.c +index 1b93db01aebd..082e95343120 100644 +--- a/pppd/eap.c ++++ b/pppd/eap.c +@@ -1328,6 +1328,12 @@ int len; + int fd; + #endif /* USE_SRP */ + ++ /* ++ * Ignore requests if we're not open ++ */ ++ if (esp->es_client.ea_state <= eapClosed) ++ return; ++ + /* + * Note: we update es_client.ea_id *only if* a Response + * message is being generated. Otherwise, we leave it the +@@ -1736,6 +1742,12 @@ int len; + u_char dig[SHA_DIGESTSIZE]; + #endif /* USE_SRP */ + ++ /* ++ * Ignore responses if we're not open ++ */ ++ if (esp->es_server.ea_state <= eapClosed) ++ return; ++ + if (esp->es_server.ea_id != id) { + dbglog("EAP: discarding Response %d; expected ID %d", id, + esp->es_server.ea_id); +@@ -2047,6 +2059,12 @@ u_char *inp; + int id; + int len; + { ++ /* ++ * Ignore failure messages if we're not open ++ */ ++ if (esp->es_client.ea_state <= eapClosed) ++ return; ++ + if (!eap_client_active(esp)) { + dbglog("EAP unexpected failure message in state %s (%d)", + eap_state_name(esp->es_client.ea_state), |