openssh/openssh-5.8p1-reseed.patch
Jan F 39c7b05d62 use /dev/random or /dev/urandom for seeding prng
improve periodical reseeding of random generator
2011-03-22 22:05:18 +01:00

54 lines
1.5 KiB
Diff

diff -up openssh-5.8p1/sshd.c.reseed openssh-5.8p1/sshd.c
--- openssh-5.8p1/sshd.c.reseed 2011-03-16 15:48:47.870648161 +0100
+++ openssh-5.8p1/sshd.c 2011-03-16 18:55:52.998648933 +0100
@@ -225,6 +225,8 @@ static volatile sig_atomic_t key_do_rege
static volatile sig_atomic_t received_sighup = 0;
static volatile sig_atomic_t received_sigterm = 0;
+static volatile int need_reseed = 0;
+
/* session identifier, used by RSA-auth */
u_char session_id[16];
@@ -396,6 +398,9 @@ generate_ephemeral_server_key(void)
arc4random_stir();
}
+/*
+ * Signal handler for the alarm in the accept loop.
+ */
/*ARGSUSED*/
static void
key_regeneration_alarm(int sig)
@@ -405,6 +410,7 @@ key_regeneration_alarm(int sig)
signal(SIGALRM, SIG_DFL);
errno = save_errno;
key_do_regen = 1;
+ need_reseed = 1;
}
static void
@@ -1277,6 +1285,13 @@ server_accept_loop(int *sock_in, int *so
* the child process the connection. The
* parent continues listening.
*/
+ if (need_reseed) {
+ seed_rng();
+ logit("random reseeded");
+ need_reseed = 0;
+ signal(SIGALRM, key_regeneration_alarm);
+ alarm(options.key_regeneration_time);
+ }
platform_pre_fork();
if ((pid = fork()) == 0) {
/*
@@ -1836,6 +1852,8 @@ main(int ac, char **av)
signal(SIGCHLD, main_sigchld_handler);
signal(SIGTERM, sigterm_handler);
signal(SIGQUIT, sigterm_handler);
+ signal(SIGALRM, key_regeneration_alarm);
+ alarm(options.key_regeneration_time);
/*
* Write out the pid file after the sigterm handler