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read back from libcrypto RAND when privdropping

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makes certain libcrypto implementations cache a /dev/urandom fd
in preparation of sandboxing. Based on patch by Greg Hartman.
This commit is contained in:
Damien Miller 2015-11-14 18:44:49 +11:00
parent 1560596f44
commit 07889c7592
1 changed files with 6 additions and 0 deletions
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6
sshd.c
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@ -624,6 +624,8 @@ privsep_preauth_child(void)
arc4random_buf(rnd, sizeof(rnd));
#ifdef WITH_OPENSSL
RAND_seed(rnd, sizeof(rnd));
if ((RAND_bytes((u_char *)rnd, 1)) != 1)
fatal("%s: RAND_bytes failed", __func__);
#endif
explicit_bzero(rnd, sizeof(rnd));
@ -767,6 +769,8 @@ privsep_postauth(Authctxt *authctxt)
arc4random_buf(rnd, sizeof(rnd));
#ifdef WITH_OPENSSL
RAND_seed(rnd, sizeof(rnd));
if ((RAND_bytes((u_char *)rnd, 1)) != 1)
fatal("%s: RAND_bytes failed", __func__);
#endif
explicit_bzero(rnd, sizeof(rnd));
@ -1436,6 +1440,8 @@ server_accept_loop(int *sock_in, int *sock_out, int *newsock, int *config_s)
arc4random_buf(rnd, sizeof(rnd));
#ifdef WITH_OPENSSL
RAND_seed(rnd, sizeof(rnd));
if ((RAND_bytes((u_char *)rnd, 1)) != 1)
fatal("%s: RAND_bytes failed", __func__);
#endif
explicit_bzero(rnd, sizeof(rnd));
}