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-rw-r--r--common-kex.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/common-kex.c b/common-kex.c
index 4caa06e..39d916b 100644
--- a/common-kex.c
+++ b/common-kex.c
@@ -487,6 +487,12 @@ void recv_msg_kexinit() {
TRACE(("continue recv_msg_kexinit: sent kexinit"))
}
+ /* "Once a party has sent a SSH_MSG_KEXINIT message ...
+ further SSH_MSG_KEXINIT messages MUST NOT be sent" */
+ if (ses.kexstate.recvkexinit) {
+ dropbear_exit("Unexpected KEXINIT");
+ }
+
/* start the kex hash */
local_ident_len = strlen(LOCAL_IDENT);
remote_ident_len = strlen(ses.remoteident);