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diff -up openssh-8.7p1/compat.c.sshrsacheck openssh-8.7p1/compat.c
--- openssh-8.7p1/compat.c.sshrsacheck 2023-01-12 13:29:06.338710923 +0100
+++ openssh-8.7p1/compat.c 2023-01-12 13:29:06.357711165 +0100
@@ -43,6 +43,7 @@ void
compat_banner(struct ssh *ssh, const char *version)
{
int i;
+ int forbid_ssh_rsa = 0;
static struct {
char *pat;
int bugs;
@@ -145,16 +146,21 @@ compat_banner(struct ssh *ssh, const cha
};
/* process table, return first match */
+ forbid_ssh_rsa = (ssh->compat & SSH_RH_RSASIGSHA);
ssh->compat = 0;
for (i = 0; check[i].pat; i++) {
if (match_pattern_list(version, check[i].pat, 0) == 1) {
debug_f("match: %s pat %s compat 0x%08x",
version, check[i].pat, check[i].bugs);
ssh->compat = check[i].bugs;
+ if (forbid_ssh_rsa)
+ ssh->compat |= SSH_RH_RSASIGSHA;
return;
}
}
debug_f("no match: %s", version);
+ if (forbid_ssh_rsa)
+ ssh->compat |= SSH_RH_RSASIGSHA;
}
/* Always returns pointer to allocated memory, caller must free. */
diff -up openssh-8.7p1/compat.h.sshrsacheck openssh-8.7p1/compat.h
--- openssh-8.7p1/compat.h.sshrsacheck 2021-08-20 06:03:49.000000000 +0200
+++ openssh-8.7p1/compat.h 2023-01-12 13:29:06.358711178 +0100
@@ -30,7 +30,7 @@
#define SSH_BUG_UTF8TTYMODE 0x00000001
#define SSH_BUG_SIGTYPE 0x00000002
#define SSH_BUG_SIGTYPE74 0x00000004
-/* #define unused 0x00000008 */
+#define SSH_RH_RSASIGSHA 0x00000008
#define SSH_OLD_SESSIONID 0x00000010
/* #define unused 0x00000020 */
#define SSH_BUG_DEBUG 0x00000040
diff -up openssh-8.7p1/monitor.c.sshrsacheck openssh-8.7p1/monitor.c
--- openssh-8.7p1/monitor.c.sshrsacheck 2023-01-20 13:07:54.279676981 +0100
+++ openssh-8.7p1/monitor.c 2023-01-20 15:01:07.007821379 +0100
@@ -660,11 +660,12 @@ mm_answer_sign(struct ssh *ssh, int sock
struct sshkey *key;
struct sshbuf *sigbuf = NULL;
u_char *p = NULL, *signature = NULL;
- char *alg = NULL;
+ char *alg = NULL, *effective_alg;
size_t datlen, siglen, alglen;
int r, is_proof = 0;
u_int keyid, compat;
const char proof_req[] = "hostkeys-prove-00@openssh.com";
+ const char safe_rsa[] = "rsa-sha2-256";
debug3_f("entering");
@@ -719,18 +720,30 @@ mm_answer_sign(struct ssh *ssh, int sock
}
if ((key = get_hostkey_by_index(keyid)) != NULL) {
- if ((r = sshkey_sign(key, &signature, &siglen, p, datlen, alg,
+ if (ssh->compat & SSH_RH_RSASIGSHA && strcmp(alg, "ssh-rsa") == 0
+ && (sshkey_type_plain(key->type) == KEY_RSA)) {
+ effective_alg = safe_rsa;
+ } else {
+ effective_alg = alg;
+ }
+ if ((r = sshkey_sign(key, &signature, &siglen, p, datlen, effective_alg,
options.sk_provider, NULL, compat)) != 0)
fatal_fr(r, "sign");
} else if ((key = get_hostkey_public_by_index(keyid, ssh)) != NULL &&
auth_sock > 0) {
+ if (ssh->compat & SSH_RH_RSASIGSHA && strcmp(alg, "ssh-rsa") == 0
+ && (sshkey_type_plain(key->type) == KEY_RSA)) {
+ effective_alg = safe_rsa;
+ } else {
+ effective_alg = alg;
+ }
if ((r = ssh_agent_sign(auth_sock, key, &signature, &siglen,
- p, datlen, alg, compat)) != 0)
+ p, datlen, effective_alg, compat)) != 0)
fatal_fr(r, "agent sign");
} else
fatal_f("no hostkey from index %d", keyid);
- debug3_f("%s %s signature len=%zu", alg,
+ debug3_f("%s (effective: %s) %s signature len=%zu", alg, effective_alg,
is_proof ? "hostkey proof" : "KEX", siglen);
sshbuf_reset(m);
diff -up openssh-8.7p1/regress/cert-userkey.sh.sshrsacheck openssh-8.7p1/regress/cert-userkey.sh
--- openssh-8.7p1/regress/cert-userkey.sh.sshrsacheck 2023-01-25 14:26:52.885963113 +0100
+++ openssh-8.7p1/regress/cert-userkey.sh 2023-01-25 14:27:25.757219800 +0100
@@ -7,7 +7,8 @@ rm -f $OBJ/authorized_keys_$USER $OBJ/us
cp $OBJ/sshd_proxy $OBJ/sshd_proxy_bak
cp $OBJ/ssh_proxy $OBJ/ssh_proxy_bak
-PLAIN_TYPES=`$SSH -Q key-plain | maybe_filter_sk | sed 's/^ssh-dss/ssh-dsa/;s/^ssh-//'`
+#ssh-dss keys are incompatible with DEFAULT crypto policy
+PLAIN_TYPES=`$SSH -Q key-plain | maybe_filter_sk | grep -v 'ssh-dss' | sed 's/^ssh-dss/ssh-dsa/;s/^ssh-//'`
EXTRA_TYPES=""
rsa=""
diff -up openssh-8.7p1/regress/Makefile.sshrsacheck openssh-8.7p1/regress/Makefile
--- openssh-8.7p1/regress/Makefile.sshrsacheck 2023-01-20 13:07:54.169676051 +0100
+++ openssh-8.7p1/regress/Makefile 2023-01-20 13:07:54.290677074 +0100
@@ -2,7 +2,8 @@
tests: prep file-tests t-exec unit
-REGRESS_TARGETS= t1 t2 t3 t4 t5 t6 t7 t8 t9 t10 t11 t12
+#ssh-dss tests will not pass on DEFAULT crypto-policy because of SHA1, skipping
+REGRESS_TARGETS= t1 t2 t3 t4 t5 t7 t8 t9 t10 t11 t12
# File based tests
file-tests: $(REGRESS_TARGETS)
diff -up openssh-8.7p1/regress/test-exec.sh.sshrsacheck openssh-8.7p1/regress/test-exec.sh
--- openssh-8.7p1/regress/test-exec.sh.sshrsacheck 2023-01-25 14:24:54.778040819 +0100
+++ openssh-8.7p1/regress/test-exec.sh 2023-01-25 14:26:39.500858590 +0100
@@ -581,8 +581,9 @@ maybe_filter_sk() {
fi
}
-SSH_KEYTYPES=`$SSH -Q key-plain | maybe_filter_sk`
-SSH_HOSTKEY_TYPES=`$SSH -Q key-plain | maybe_filter_sk`
+#ssh-dss keys are incompatible with DEFAULT crypto policy
+SSH_KEYTYPES=`$SSH -Q key-plain | maybe_filter_sk | grep -v 'ssh-dss'`
+SSH_HOSTKEY_TYPES=`$SSH -Q key-plain | maybe_filter_sk | grep -v 'ssh-dss'`
for t in ${SSH_KEYTYPES}; do
# generate user key
diff -up openssh-8.7p1/regress/unittests/kex/test_kex.c.sshrsacheck openssh-8.7p1/regress/unittests/kex/test_kex.c
--- openssh-8.7p1/regress/unittests/kex/test_kex.c.sshrsacheck 2023-01-26 13:34:52.645743677 +0100
+++ openssh-8.7p1/regress/unittests/kex/test_kex.c 2023-01-26 13:36:56.220745823 +0100
@@ -97,7 +97,8 @@ do_kex_with_key(char *kex, int keytype,
memcpy(kex_params.proposal, myproposal, sizeof(myproposal));
if (kex != NULL)
kex_params.proposal[PROPOSAL_KEX_ALGS] = kex;
- keyname = strdup(sshkey_ssh_name(private));
+ keyname = (strcmp(sshkey_ssh_name(private), "ssh-rsa")) ?
+ strdup(sshkey_ssh_name(private)) : strdup("rsa-sha2-256");
ASSERT_PTR_NE(keyname, NULL);
kex_params.proposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = keyname;
ASSERT_INT_EQ(ssh_init(&client, 0, &kex_params), 0);
@@ -180,7 +181,7 @@ do_kex(char *kex)
{
#ifdef WITH_OPENSSL
do_kex_with_key(kex, KEY_RSA, 2048);
- do_kex_with_key(kex, KEY_DSA, 1024);
+ /* do_kex_with_key(kex, KEY_DSA, 1024); */
#ifdef OPENSSL_HAS_ECC
do_kex_with_key(kex, KEY_ECDSA, 256);
#endif /* OPENSSL_HAS_ECC */
diff -up openssh-8.7p1/regress/unittests/sshkey/test_file.c.sshrsacheck openssh-8.7p1/regress/unittests/sshkey/test_file.c
--- openssh-8.7p1/regress/unittests/sshkey/test_file.c.sshrsacheck 2023-01-26 12:04:55.946343408 +0100
+++ openssh-8.7p1/regress/unittests/sshkey/test_file.c 2023-01-26 12:06:35.235164432 +0100
@@ -110,6 +110,7 @@ sshkey_file_tests(void)
sshkey_free(k2);
TEST_DONE();
+ /* Skip this test, SHA1 signatures are not supported
TEST_START("load RSA cert with SHA1 signature");
ASSERT_INT_EQ(sshkey_load_cert(test_data_file("rsa_1_sha1"), &k2), 0);
ASSERT_PTR_NE(k2, NULL);
@@ -117,7 +118,7 @@ sshkey_file_tests(void)
ASSERT_INT_EQ(sshkey_equal_public(k1, k2), 1);
ASSERT_STRING_EQ(k2->cert->signature_type, "ssh-rsa");
sshkey_free(k2);
- TEST_DONE();
+ TEST_DONE(); */
TEST_START("load RSA cert with SHA512 signature");
ASSERT_INT_EQ(sshkey_load_cert(test_data_file("rsa_1_sha512"), &k2), 0);
diff -up openssh-8.7p1/regress/unittests/sshkey/test_fuzz.c.sshrsacheck openssh-8.7p1/regress/unittests/sshkey/test_fuzz.c
--- openssh-8.7p1/regress/unittests/sshkey/test_fuzz.c.sshrsacheck 2023-01-26 12:10:37.533168013 +0100
+++ openssh-8.7p1/regress/unittests/sshkey/test_fuzz.c 2023-01-26 12:15:35.637631860 +0100
@@ -333,13 +333,14 @@ sshkey_fuzz_tests(void)
TEST_DONE();
#ifdef WITH_OPENSSL
+ /* Skip this test, SHA1 signatures are not supported
TEST_START("fuzz RSA sig");
buf = load_file("rsa_1");
ASSERT_INT_EQ(sshkey_parse_private_fileblob(buf, "", &k1, NULL), 0);
sshbuf_free(buf);
sig_fuzz(k1, "ssh-rsa");
sshkey_free(k1);
- TEST_DONE();
+ TEST_DONE();*/
TEST_START("fuzz RSA SHA256 sig");
buf = load_file("rsa_1");
@@ -357,6 +358,7 @@ sshkey_fuzz_tests(void)
sshkey_free(k1);
TEST_DONE();
+ /* Skip this test, SHA1 signatures are not supported
TEST_START("fuzz DSA sig");
buf = load_file("dsa_1");
ASSERT_INT_EQ(sshkey_parse_private_fileblob(buf, "", &k1, NULL), 0);
@@ -364,6 +366,7 @@ sshkey_fuzz_tests(void)
sig_fuzz(k1, NULL);
sshkey_free(k1);
TEST_DONE();
+ */
#ifdef OPENSSL_HAS_ECC
TEST_START("fuzz ECDSA sig");
diff -up openssh-8.7p1/regress/unittests/sshkey/test_sshkey.c.sshrsacheck openssh-8.7p1/regress/unittests/sshkey/test_sshkey.c
--- openssh-8.7p1/regress/unittests/sshkey/test_sshkey.c.sshrsacheck 2023-01-26 11:02:52.339413463 +0100
+++ openssh-8.7p1/regress/unittests/sshkey/test_sshkey.c 2023-01-26 11:58:42.324253896 +0100
@@ -60,6 +60,9 @@ build_cert(struct sshbuf *b, struct sshk
u_char *sigblob;
size_t siglen;
+ /* ssh-rsa implies SHA1, forbidden in DEFAULT cp */
+ int expected = (sig_alg == NULL || strcmp(sig_alg, "ssh-rsa") == 0) ? SSH_ERR_LIBCRYPTO_ERROR : 0;
+
ca_buf = sshbuf_new();
ASSERT_PTR_NE(ca_buf, NULL);
ASSERT_INT_EQ(sshkey_putb(ca_key, ca_buf), 0);
@@ -101,8 +104,9 @@ build_cert(struct sshbuf *b, struct sshk
ASSERT_INT_EQ(sshbuf_put_string(b, NULL, 0), 0); /* reserved */
ASSERT_INT_EQ(sshbuf_put_stringb(b, ca_buf), 0); /* signature key */
ASSERT_INT_EQ(sshkey_sign(sign_key, &sigblob, &siglen,
- sshbuf_ptr(b), sshbuf_len(b), sig_alg, NULL, NULL, 0), 0);
- ASSERT_INT_EQ(sshbuf_put_string(b, sigblob, siglen), 0); /* signature */
+ sshbuf_ptr(b), sshbuf_len(b), sig_alg, NULL, NULL, 0), expected);
+ if (expected == 0)
+ ASSERT_INT_EQ(sshbuf_put_string(b, sigblob, siglen), 0); /* signature */
free(sigblob);
sshbuf_free(ca_buf);
@@ -119,16 +123,22 @@ signature_test(struct sshkey *k, struct
{
size_t len;
u_char *sig;
+ /* ssh-rsa implies SHA1, forbidden in DEFAULT cp */
+ int expected = (sig_alg && strcmp(sig_alg, "ssh-rsa") == 0) ? SSH_ERR_LIBCRYPTO_ERROR : 0;
+ if (k && (sshkey_type_plain(k->type) == KEY_DSA || sshkey_type_plain(k->type) == KEY_DSA_CERT))
+ expected = SSH_ERR_LIBCRYPTO_ERROR;
ASSERT_INT_EQ(sshkey_sign(k, &sig, &len, d, l, sig_alg,
- NULL, NULL, 0), 0);
- ASSERT_SIZE_T_GT(len, 8);
- ASSERT_PTR_NE(sig, NULL);
- ASSERT_INT_EQ(sshkey_verify(k, sig, len, d, l, NULL, 0, NULL), 0);
- ASSERT_INT_NE(sshkey_verify(bad, sig, len, d, l, NULL, 0, NULL), 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, NULL, 0, NULL), 0);
+ NULL, NULL, 0), expected);
+ if (expected == 0) {
+ ASSERT_SIZE_T_GT(len, 8);
+ ASSERT_PTR_NE(sig, NULL);
+ ASSERT_INT_EQ(sshkey_verify(k, sig, len, d, l, NULL, 0, NULL), 0);
+ ASSERT_INT_NE(sshkey_verify(bad, sig, len, d, l, NULL, 0, NULL), 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, NULL, 0, NULL), 0);
+ }
free(sig);
}
@@ -514,7 +524,7 @@ sshkey_tests(void)
ASSERT_INT_EQ(sshkey_load_public(test_data_file("rsa_1.pub"), &k2,
NULL), 0);
k3 = get_private("rsa_1");
- build_cert(b, k2, "ssh-rsa-cert-v01@openssh.com", k3, k1, NULL);
+ build_cert(b, k2, "ssh-rsa-cert-v01@openssh.com", k3, k1, "rsa-sha2-256");
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);
diff -up openssh-8.7p1/regress/unittests/sshsig/tests.c.sshrsacheck openssh-8.7p1/regress/unittests/sshsig/tests.c
--- openssh-8.7p1/regress/unittests/sshsig/tests.c.sshrsacheck 2023-01-26 12:19:23.659513651 +0100
+++ openssh-8.7p1/regress/unittests/sshsig/tests.c 2023-01-26 12:20:28.021044803 +0100
@@ -102,9 +102,11 @@ tests(void)
check_sig("rsa.pub", "rsa.sig", msg, namespace);
TEST_DONE();
+ /* Skip this test, SHA1 signatures are not supported
TEST_START("check DSA signature");
check_sig("dsa.pub", "dsa.sig", msg, namespace);
TEST_DONE();
+ */
#ifdef OPENSSL_HAS_ECC
TEST_START("check ECDSA signature");
diff -up openssh-8.7p1/serverloop.c.sshrsacheck openssh-8.7p1/serverloop.c
--- openssh-8.7p1/serverloop.c.sshrsacheck 2023-01-12 14:57:08.118400073 +0100
+++ openssh-8.7p1/serverloop.c 2023-01-12 14:59:17.330470518 +0100
@@ -737,6 +737,10 @@ server_input_hostkeys_prove(struct ssh *
else if (ssh->kex->flags & KEX_RSA_SHA2_256_SUPPORTED)
sigalg = "rsa-sha2-256";
}
+ if (ssh->compat & SSH_RH_RSASIGSHA && sigalg == NULL) {
+ sigalg = "rsa-sha2-512";
+ debug3_f("SHA1 signature is not supported, falling back to %s", sigalg);
+ }
debug3_f("sign %s key (index %d) using sigalg %s",
sshkey_type(key), ndx, sigalg == NULL ? "default" : sigalg);
if ((r = sshbuf_put_cstring(sigbuf,
diff -up openssh-8.7p1/sshconnect2.c.sshrsacheck openssh-8.7p1/sshconnect2.c
--- openssh-8.7p1/sshconnect2.c.sshrsacheck 2023-01-25 15:33:29.140353651 +0100
+++ openssh-8.7p1/sshconnect2.c 2023-01-25 15:59:34.225364883 +0100
@@ -1461,6 +1464,14 @@ identity_sign(struct identity *id, u_cha
retried = 1;
goto retry_pin;
}
+ if ((r == SSH_ERR_LIBCRYPTO_ERROR) && strcmp("ssh-rsa", alg)) {
+ char rsa_safe_alg[] = "rsa-sha2-512";
+ debug3_f("trying to fallback to algorithm %s", rsa_safe_alg);
+
+ if ((r = sshkey_sign(sign_key, sigp, lenp, data, datalen,
+ rsa_safe_alg, options.sk_provider, pin, compat)) != 0)
+ debug_fr(r, "sshkey_sign - RSA fallback");
+ }
goto out;
}
diff -up openssh-8.7p1/sshd.c.sshrsacheck openssh-8.7p1/sshd.c
--- openssh-8.7p1/sshd.c.sshrsacheck 2023-01-12 13:29:06.355711140 +0100
+++ openssh-8.7p1/sshd.c 2023-01-12 13:29:06.358711178 +0100
@@ -1640,6 +1651,7 @@ main(int ac, char **av)
int keytype;
Authctxt *authctxt;
struct connection_info *connection_info = NULL;
+ int forbid_ssh_rsa = 0;
#ifdef HAVE_SECUREWARE
(void)set_auth_parameters(ac, av);
@@ -1938,6 +1950,33 @@ main(int ac, char **av)
key = NULL;
continue;
}
+ if (key && (sshkey_type_plain(key->type) == KEY_RSA || sshkey_type_plain(key->type) == KEY_RSA_CERT)) {
+ size_t sign_size = 0;
+ u_char *tmp = NULL;
+ u_char data[] = "Test SHA1 vector";
+ int res;
+
+ res = sshkey_sign(key, &tmp, &sign_size, data, sizeof(data), NULL, NULL, NULL, 0);
+ free(tmp);
+ if (res == SSH_ERR_LIBCRYPTO_ERROR) {
+ verbose_f("sshd: SHA1 in signatures is disabled for RSA keys");
+ forbid_ssh_rsa = 1;
+ }
+ }
+ if (key && (sshkey_type_plain(key->type) == KEY_DSA || sshkey_type_plain(key->type) == KEY_DSA_CERT)) {
+ size_t sign_size = 0;
+ u_char *tmp = NULL;
+ u_char data[] = "Test SHA1 vector";
+ int res;
+
+ res = sshkey_sign(key, &tmp, &sign_size, data, sizeof(data), NULL, NULL, NULL, 0);
+ free(tmp);
+ if (res == SSH_ERR_LIBCRYPTO_ERROR) {
+ logit_f("sshd: ssh-dss is disabled, skipping key file %s", options.host_key_files[i]);
+ key = NULL;
+ continue;
+ }
+ }
if (sshkey_is_sk(key) &&
key->sk_flags & SSH_SK_USER_PRESENCE_REQD) {
debug("host key %s requires user presence, ignoring",
@@ -2275,6 +2306,9 @@ main(int ac, char **av)
check_ip_options(ssh);
+ if (forbid_ssh_rsa)
+ ssh->compat |= SSH_RH_RSASIGSHA;
+
/* Prepare the channels layer */
channel_init_channels(ssh);
channel_set_af(ssh, options.address_family);
diff -Nur openssh-8.7p1/ssh-keygen.c openssh-8.7p1_patched/ssh-keygen.c
--- openssh-8.7p1/ssh-keygen.c 2023-01-18 17:41:47.894515779 +0100
+++ openssh-8.7p1_patched/ssh-keygen.c 2023-01-18 17:41:44.500488818 +0100
@@ -491,6 +491,8 @@
BIGNUM *dsa_pub_key = NULL, *dsa_priv_key = NULL;
BIGNUM *rsa_n = NULL, *rsa_e = NULL, *rsa_d = NULL;
BIGNUM *rsa_p = NULL, *rsa_q = NULL, *rsa_iqmp = NULL;
+ char rsa_safe_alg[] = "rsa-sha2-256";
+ char *alg = NULL;
if ((r = sshbuf_get_u32(b, &magic)) != 0)
fatal_fr(r, "parse magic");
@@ -590,6 +592,7 @@ do_convert_private_ssh2(struct sshbuf *b
if ((r = ssh_rsa_complete_crt_parameters(key, rsa_iqmp)) != 0)
fatal_fr(r, "generate RSA parameters");
BN_clear_free(rsa_iqmp);
+ alg = rsa_safe_alg;
break;
}
rlen = sshbuf_len(b);
@@ -598,9 +601,9 @@ do_convert_private_ssh2(struct sshbuf *b
/* try the key */
if (sshkey_sign(key, &sig, &slen, data, sizeof(data),
- NULL, NULL, NULL, 0) != 0 ||
+ alg, NULL, NULL, 0) != 0 ||
sshkey_verify(key, sig, slen, data, sizeof(data),
- NULL, 0, NULL) != 0) {
+ alg, 0, NULL) != 0) {
sshkey_free(key);
free(sig);
return NULL;
diff -up openssh-8.7p1/ssh-rsa.c.sshrsacheck openssh-8.7p1/ssh-rsa.c
--- openssh-8.7p1/ssh-rsa.c.sshrsacheck 2023-01-20 13:07:54.180676144 +0100
+++ openssh-8.7p1/ssh-rsa.c 2023-01-20 13:07:54.290677074 +0100
@@ -254,7 +254,8 @@ ssh_rsa_verify(const struct sshkey *key,
ret = SSH_ERR_INVALID_ARGUMENT;
goto out;
}
- if (hash_alg != want_alg) {
+ if (hash_alg != want_alg && want_alg != SSH_DIGEST_SHA1) {
+ debug_f("Unexpected digest algorithm: got %d, wanted %d", hash_alg, want_alg);
ret = SSH_ERR_SIGNATURE_INVALID;
goto out;
}
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