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server: We should list SHA2 variants in offered hostkeys

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The SHA2 variants should be preferred. Also the buffer needs to be
extended to fit all possible public key algorithms.

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
This commit is contained in:
Jakub Jelen
2018-07-03 16:54:35 +02:00
committed by Andreas Schneider
parent 6fa5e8adb0
commit 5d13006650
1 changed files with 6 additions and 1 deletions
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7
src/server.c
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@@ -86,7 +86,7 @@ static int server_set_kex(ssh_session session) {
struct ssh_kex_struct *server = &session->next_crypto->server_kex;
int i, j, rc;
const char *wanted;
char hostkeys[64] = {0};
char hostkeys[128] = {0};
enum ssh_keytypes_e keytype;
size_t len;
int ok;
@@ -122,6 +122,11 @@ static int server_set_kex(ssh_session session) {
}
#endif
if (session->srv.rsa_key != NULL) {
/* We support also the SHA2 variants */
len = strlen(hostkeys);
snprintf(hostkeys + len, sizeof(hostkeys) - len,
",rsa-sha2-512,rsa-sha2-256");
len = strlen(hostkeys);
keytype = ssh_key_type(session->srv.rsa_key);