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packet: Implement rekeying based on the recommendation from RFC's

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The default rekeying recommendations are specified in
RFC4344 Section 3 (First and Second Rekeying Recommendations).
Additionally, the rekeying can be specified in configuration
file/options allowing us to turn the rekeying off, base it
on time or make it more strict.

The code is highly inspired by the OpenSSH rekeying code.

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Daiki Ueno <dueno@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
This commit is contained in:
Jakub Jelen
2018-11-15 13:43:18 +01:00
committed by Andreas Schneider
parent c86a00d06b
commit 58cae2366a
6 changed files with 248 additions and 6 deletions
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17
src/session.c
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@@ -85,6 +85,11 @@ ssh_session ssh_new(void) {
goto err;
}
session->out_queue = ssh_list_new();
if (session->out_queue == NULL) {
goto err;
}
session->alive = 0;
session->auth.supported_methods = 0;
ssh_set_blocking(session, 1);
@@ -166,9 +171,11 @@ err:
* @see ssh_disconnect()
* @see ssh_new()
*/
void ssh_free(ssh_session session) {
void ssh_free(ssh_session session)
{
int i;
struct ssh_iterator *it;
struct ssh_iterator *it = NULL;
struct ssh_buffer_struct *b = NULL;
if (session == NULL) {
return;
@@ -262,6 +269,12 @@ void ssh_free(ssh_session session) {
ssh_list_free(session->opts.identity);
}
while ((b = ssh_list_pop_head(struct ssh_buffer_struct *,
session->out_queue)) != NULL) {
ssh_buffer_free(b);
}
ssh_list_free(session->out_queue);
#ifndef _WIN32
ssh_agent_state_free (session->agent_state);
#endif