commit 07889c75926c040b8e095949c724e66af26441cb
author Damien Miller <djm@mindrot.org> Sat Nov 14 18:44:49 2015 +1100
committer Damien Miller <djm@mindrot.org> Sat Nov 14 18:49:04 2015 +1100
tree 3d0e788907dd378e81cf763696846ee5d390fff2
parent 1560596f44c01bb0cef977816410950ed17b8ecd

read back from libcrypto RAND when privdropping

makes certain libcrypto implementations cache a /dev/urandom fd
in preparation of sandboxing. Based on patch by Greg Hartman.

sshd.c

diff --git a/sshd.c b/sshd.c
index d868089..b19cc34 100644
--- a/sshd.c
+++ b/sshd.c
@@ -624,6 +624,8 @@
 	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 @@
 	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 @@
 			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));
 		}