From 5acee497bf3e44d86bdecf5bfa35042c363ab753 Mon Sep 17 00:00:00 2001
From: Matt Johnston <matt@ucc.asn.au>
Date: Tue, 19 May 2020 00:31:41 +0800
Subject: ext-info handling for server-sig-algs only client side is handled

---
 cli-kex.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'cli-kex.c')

diff --git a/cli-kex.c b/cli-kex.c
index 7337ffd..99370eb 100644
--- a/cli-kex.c
+++ b/cli-kex.c
@@ -411,3 +411,28 @@ out:
 	}
 	m_free(fingerprint);
 }
+
+void recv_msg_ext_info(void) {
+	/* This message is not client-specific in the protocol but Dropbear only handles
+	a server-sent message at present. */
+	unsigned int num_ext;
+	unsigned int i;
+
+	num_ext = buf_getint(ses.payload);
+	TRACE(("received SSH_MSG_EXT_INFO with %d items", num_ext))
+
+	for (i = 0; i < num_ext; i++) {
+		unsigned int name_len;
+		char *ext_name = buf_getstring(ses.payload, &name_len);
+		TRACE(("extension %d name '%s'", i, ext_name))
+		if (cli_ses.server_sig_algs == NULL
+				&& name_len == strlen(SSH_SERVER_SIG_ALGS)
+				&& strcmp(ext_name, SSH_SERVER_SIG_ALGS) == 0) {
+			cli_ses.server_sig_algs = buf_getbuf(ses.payload);
+		} else {
+			/* valid extension values could be >MAX_STRING_LEN */
+			buf_eatstring(ses.payload);
+		}
+		m_free(ext_name);
+	}
+}
-- 
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