From: djm <djm@openbsd.org>
Date: Sun, 18 Jan 2015 19:54:46 +0000 (+0000)
Subject: more and better key tests
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=f03f699fab54ff836496c63e01fc6b12d5ae1e10;p=openbsd

more and better key tests

test signatures and verification
test certificate generation
flesh out nested cert test

removes most of the XXX todo markers
---

diff --git a/regress/usr.bin/ssh/unittests/sshkey/mktestdata.sh b/regress/usr.bin/ssh/unittests/sshkey/mktestdata.sh
index ee1fe396208..09165af02fd 100755
--- a/regress/usr.bin/ssh/unittests/sshkey/mktestdata.sh
+++ b/regress/usr.bin/ssh/unittests/sshkey/mktestdata.sh
@@ -1,5 +1,5 @@
 #!/bin/sh
-# $OpenBSD: mktestdata.sh,v 1.3 2014/07/22 23:57:40 dtucker Exp $
+# $OpenBSD: mktestdata.sh,v 1.4 2015/01/18 19:54:46 djm Exp $
 
 PW=mekmitasdigoat
 
@@ -187,4 +187,6 @@ ssh-keygen -Bf dsa_2 | awk '{print $2}' > dsa_2.fp.bb
 ssh-keygen -Bf ecdsa_2 | awk '{print $2}' > ecdsa_2.fp.bb
 ssh-keygen -Bf ed25519_2 | awk '{print $2}' > ed25519_2.fp.bb
 
+# XXX Extend ssh-keygen to do detached signatures (better to test/fuzz against)
+
 echo "$PW" > pw
diff --git a/regress/usr.bin/ssh/unittests/sshkey/test_sshkey.c b/regress/usr.bin/ssh/unittests/sshkey/test_sshkey.c
index 0864ffd78a0..d455c4408d1 100644
--- a/regress/usr.bin/ssh/unittests/sshkey/test_sshkey.c
+++ b/regress/usr.bin/ssh/unittests/sshkey/test_sshkey.c
@@ -1,4 +1,4 @@
-/* 	$OpenBSD: test_sshkey.c,v 1.1 2014/06/24 01:14:18 djm Exp $ */
+/* 	$OpenBSD: test_sshkey.c,v 1.2 2015/01/18 19:54:46 djm Exp $ */
 /*
  * Regress test for sshkey.h key management API
  *
@@ -30,6 +30,20 @@
 
 void sshkey_tests(void);
 
+static void
+put_opt(struct sshbuf *b, const char *name, const char *value)
+{
+	struct sshbuf *sect;
+
+	sect = sshbuf_new();
+	ASSERT_PTR_NE(sect, NULL);
+	ASSERT_INT_EQ(sshbuf_put_cstring(b, name), 0);
+	if (value != NULL)
+		ASSERT_INT_EQ(sshbuf_put_cstring(sect, value), 0);
+	ASSERT_INT_EQ(sshbuf_put_stringb(b, sect), 0);
+	sshbuf_free(sect);
+}
+
 static void
 build_cert(struct sshbuf *b, const struct sshkey *k, const char *type,
     const struct sshkey *sign_key, const struct sshkey *ca_key)
@@ -39,6 +53,7 @@ build_cert(struct sshbuf *b, const struct sshkey *k, const char *type,
 	size_t siglen;
 
 	ca_buf = sshbuf_new();
+	ASSERT_PTR_NE(ca_buf, NULL);
 	ASSERT_INT_EQ(sshkey_to_blob_buf(ca_key, ca_buf), 0);
 
 	/*
@@ -46,18 +61,23 @@ build_cert(struct sshbuf *b, const struct sshkey *k, const char *type,
 	 * the type string. This is a bit of a hack :/
 	 */
 	pk = sshbuf_new();
+	ASSERT_PTR_NE(pk, NULL);
 	ASSERT_INT_EQ(sshkey_plain_to_blob_buf(k, pk), 0);
 	ASSERT_INT_EQ(sshbuf_skip_string(pk), 0);
 
 	principals = sshbuf_new();
+	ASSERT_PTR_NE(principals, NULL);
 	ASSERT_INT_EQ(sshbuf_put_cstring(principals, "gsamsa"), 0);
 	ASSERT_INT_EQ(sshbuf_put_cstring(principals, "gregor"), 0);
 
 	critopts = sshbuf_new();
-	/* XXX fill this in */
+	ASSERT_PTR_NE(critopts, NULL);
+	put_opt(critopts, "force-command", "/usr/local/bin/nethack");
+	put_opt(critopts, "source-address", "192.168.0.0/24,127.0.0.1,::1");
 
 	exts = sshbuf_new();
-	/* XXX fill this in */
+	ASSERT_PTR_NE(exts, NULL);
+	put_opt(critopts, "permit-X11-forwarding", NULL);
 
 	ASSERT_INT_EQ(sshbuf_put_cstring(b, type), 0);
 	ASSERT_INT_EQ(sshbuf_put_cstring(b, "noncenoncenonce!"), 0); /* nonce */
@@ -84,6 +104,67 @@ build_cert(struct sshbuf *b, const struct sshkey *k, const char *type,
 	sshbuf_free(pk);
 }
 
+static void
+signature_test(struct sshkey *k, struct sshkey *bad, const u_char *d, size_t l)
+{
+	size_t len;
+	u_char *sig;
+
+	ASSERT_INT_EQ(sshkey_sign(k, &sig, &len, d, l, 0), 0);
+	ASSERT_SIZE_T_GT(len, 8);
+	ASSERT_PTR_NE(sig, NULL);
+	ASSERT_INT_EQ(sshkey_verify(k, sig, len, d, l, 0), 0);
+	ASSERT_INT_NE(sshkey_verify(bad, sig, len, d, l, 0), 0);
+	/* Fuzz test is more comprehensive, this is just a smoke test */
+	sig[len - 5] ^= 0x10;
+	ASSERT_INT_NE(sshkey_verify(k, sig, len, d, l, 0), 0);
+	free(sig);
+}
+
+static void
+banana(u_char *s, size_t l)
+{
+	size_t o;
+	const u_char the_banana[] = { 'b', 'a', 'n', 'a', 'n', 'a' };
+
+	for (o = 0; o < l; o += sizeof(the_banana)) {
+		if (l - o < sizeof(the_banana)) {
+			memcpy(s + o, "nanananana", l - o);
+			break;
+		}
+		memcpy(s + o, banana, sizeof(the_banana));
+	}
+}
+
+static void
+signature_tests(struct sshkey *k, struct sshkey *bad)
+{
+	u_char i, buf[2049];
+	size_t lens[] = {
+		1, 2, 7, 8, 9, 15, 16, 17, 31, 32, 33, 127, 128, 129,
+		255, 256, 257, 1023, 1024, 1025, 2047, 2048, 2049
+	};
+
+	for (i = 0; i < (sizeof(lens)/sizeof(lens[0])); i++) {
+		test_subtest_info("%s key, banana length %zu",
+		    sshkey_type(k), lens[i]);
+		banana(buf, lens[i]);
+		signature_test(k, bad, buf, lens[i]);
+	}
+}
+
+static struct sshkey *
+get_private(const char *n)
+{
+	struct sshbuf *b;
+	struct sshkey *ret;
+
+	b = load_file(n);
+	ASSERT_INT_EQ(sshkey_parse_private_fileblob(b, "", n, &ret, NULL), 0);
+	sshbuf_free(b);
+	return ret;
+}
+
 void
 sshkey_tests(void)
 {
@@ -316,26 +397,98 @@ sshkey_tests(void)
 	sshkey_free(ke);
 	sshkey_free(kf);
 
-/* XXX certify test */
-/* XXX sign test */
-/* XXX verify test */
+	TEST_START("certify key");
+	ASSERT_INT_EQ(sshkey_load_public(test_data_file("ed25519_1.pub"),
+	    &k1, NULL), 0);
+	k2 = get_private("ed25519_2");
+	ASSERT_INT_EQ(sshkey_to_certified(k1, 0), 0);
+	ASSERT_PTR_NE(k1->cert, NULL);
+	k1->cert->type = SSH2_CERT_TYPE_USER;
+	k1->cert->serial = 1234;
+	k1->cert->key_id = strdup("estragon");
+	ASSERT_PTR_NE(k1->cert->key_id, NULL);
+	k1->cert->principals = calloc(4, sizeof(*k1->cert->principals));
+	ASSERT_PTR_NE(k1->cert->principals, NULL);
+	k1->cert->principals[0] = strdup("estragon");
+	k1->cert->principals[1] = strdup("vladimir");
+	k1->cert->principals[2] = strdup("pozzo");
+	k1->cert->principals[3] = strdup("lucky");
+	ASSERT_PTR_NE(k1->cert->principals[0], NULL);
+	ASSERT_PTR_NE(k1->cert->principals[1], NULL);
+	ASSERT_PTR_NE(k1->cert->principals[2], NULL);
+	ASSERT_PTR_NE(k1->cert->principals[3], NULL);
+	k1->cert->valid_after = 0;
+	k1->cert->valid_before = (u_int64_t)-1;
+	k1->cert->critical = sshbuf_new();
+	ASSERT_PTR_NE(k1->cert->critical, NULL);
+	k1->cert->extensions = sshbuf_new();
+	ASSERT_PTR_NE(k1->cert->extensions, NULL);
+	put_opt(k1->cert->critical, "force-command", "/usr/bin/true");
+	put_opt(k1->cert->critical, "source-address", "127.0.0.1");
+	put_opt(k1->cert->extensions, "permit-X11-forwarding", NULL);
+	put_opt(k1->cert->extensions, "permit-agent-forwarding", NULL);
+	ASSERT_INT_EQ(sshkey_from_private(k2, &k1->cert->signature_key), 0);
+	ASSERT_INT_EQ(sshkey_certify(k1, k2), 0);
+	b = sshbuf_new();
+	ASSERT_PTR_NE(b, NULL);
+	ASSERT_INT_EQ(sshkey_to_blob_buf(k1, b), 0);
+	ASSERT_INT_EQ(sshkey_from_blob(sshbuf_ptr(b), sshbuf_len(b), &k3), 0);
+
+	sshkey_free(k1);
+	sshkey_free(k2);
+	sshkey_free(k3);
+	sshbuf_reset(b);
+	TEST_DONE();
+
+	TEST_START("sign and verify RSA");
+	k1 = get_private("rsa_1");
+	ASSERT_INT_EQ(sshkey_load_public(test_data_file("rsa_2.pub"), &k2,
+	    NULL), 0);
+	signature_tests(k1, k2);
+	sshkey_free(k1);
+	sshkey_free(k2);
+	TEST_DONE();
+
+	TEST_START("sign and verify DSA");
+	k1 = get_private("dsa_1");
+	ASSERT_INT_EQ(sshkey_load_public(test_data_file("dsa_2.pub"), &k2,
+	    NULL), 0);
+	signature_tests(k1, k2);
+	sshkey_free(k1);
+	sshkey_free(k2);
+	TEST_DONE();
+
+	TEST_START("sign and verify ECDSA");
+	k1 = get_private("ecdsa_1");
+	ASSERT_INT_EQ(sshkey_load_public(test_data_file("ecdsa_2.pub"), &k2,
+	    NULL), 0);
+	signature_tests(k1, k2);
+	sshkey_free(k1);
+	sshkey_free(k2);
+	TEST_DONE();
+
+	TEST_START("sign and verify ED25519");
+	k1 = get_private("ed25519_1");
+	ASSERT_INT_EQ(sshkey_load_public(test_data_file("ed25519_2.pub"), &k2,
+	    NULL), 0);
+	signature_tests(k1, k2);
+	sshkey_free(k1);
+	sshkey_free(k2);
+	TEST_DONE();
 
 	TEST_START("nested certificate");
 	ASSERT_INT_EQ(sshkey_load_cert(test_data_file("rsa_1"), &k1), 0);
 	ASSERT_INT_EQ(sshkey_load_public(test_data_file("rsa_1.pub"), &k2,
 	    NULL), 0);
-	b = load_file("rsa_2");
-	ASSERT_INT_EQ(sshkey_parse_private_fileblob(b, "", "rsa_1",
-	    &k3, NULL), 0);
-	sshbuf_reset(b);
+	k3 = get_private("ed25519_2");
 	build_cert(b, k2, "ssh-rsa-cert-v01@openssh.com", k3, k1);
 	ASSERT_INT_EQ(sshkey_from_blob(sshbuf_ptr(b), sshbuf_len(b), &k4),
 	    SSH_ERR_KEY_CERT_INVALID_SIGN_KEY);
 	ASSERT_PTR_EQ(k4, NULL);
-	sshbuf_free(b);
 	sshkey_free(k1);
 	sshkey_free(k2);
 	sshkey_free(k3);
+	sshbuf_free(b);
 	TEST_DONE();
 
 }