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Eliminating remnants of SHA1 usage in OpenSSH

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Resolves: rhbz#2070163
This commit is contained in:
Dmitry Belyavskiy 2023-04-20 17:54:07 +02:00
parent cc7d7a5730
commit b5ba5af997
2 changed files with 341 additions and 3 deletions
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332
openssh-8.7p1-nohostsha1proof.patch
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@ -43,6 +43,255 @@ diff -up openssh-8.7p1/compat.h.sshrsacheck openssh-8.7p1/compat.h
#define SSH_OLD_SESSIONID 0x00000010 #define SSH_OLD_SESSIONID 0x00000010
/* #define unused 0x00000020 */ /* #define unused 0x00000020 */
#define SSH_BUG_DEBUG 0x00000040 #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 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.sshrsacheck 2023-01-12 14:57:08.118400073 +0100
+++ openssh-8.7p1/serverloop.c 2023-01-12 14:59:17.330470518 +0100 +++ openssh-8.7p1/serverloop.c 2023-01-12 14:59:17.330470518 +0100
@ -57,6 +306,24 @@ diff -up openssh-8.7p1/serverloop.c.sshrsacheck openssh-8.7p1/serverloop.c
debug3_f("sign %s key (index %d) using sigalg %s", debug3_f("sign %s key (index %d) using sigalg %s",
sshkey_type(key), ndx, sigalg == NULL ? "default" : sigalg); sshkey_type(key), ndx, sigalg == NULL ? "default" : sigalg);
if ((r = sshbuf_put_cstring(sigbuf, 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 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.sshrsacheck 2023-01-12 13:29:06.355711140 +0100
+++ openssh-8.7p1/sshd.c 2023-01-12 13:29:06.358711178 +0100 +++ openssh-8.7p1/sshd.c 2023-01-12 13:29:06.358711178 +0100
@ -68,7 +335,7 @@ diff -up openssh-8.7p1/sshd.c.sshrsacheck openssh-8.7p1/sshd.c
#ifdef HAVE_SECUREWARE #ifdef HAVE_SECUREWARE
(void)set_auth_parameters(ac, av); (void)set_auth_parameters(ac, av);
@@ -1938,6 +1950,19 @@ main(int ac, char **av) @@ -1938,6 +1950,33 @@ main(int ac, char **av)
key = NULL; key = NULL;
continue; continue;
} }
@ -78,12 +345,26 @@ diff -up openssh-8.7p1/sshd.c.sshrsacheck openssh-8.7p1/sshd.c
+ u_char data[] = "Test SHA1 vector"; + u_char data[] = "Test SHA1 vector";
+ int res; + int res;
+ +
+ res = ssh_rsa_sign(key, &tmp, &sign_size, data, sizeof(data), NULL); + res = sshkey_sign(key, &tmp, &sign_size, data, sizeof(data), NULL, NULL, NULL, 0);
+ free(tmp); + free(tmp);
+ if (res == SSH_ERR_LIBCRYPTO_ERROR) { + if (res == SSH_ERR_LIBCRYPTO_ERROR) {
+ logit_f("sshd: ssh-rsa algorithm is disabled"); + verbose_f("sshd: SHA1 in signatures is disabled for RSA keys");
+ forbid_ssh_rsa = 1; + 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) && if (sshkey_is_sk(key) &&
key->sk_flags & SSH_SK_USER_PRESENCE_REQD) { key->sk_flags & SSH_SK_USER_PRESENCE_REQD) {
@ -98,3 +379,48 @@ diff -up openssh-8.7p1/sshd.c.sshrsacheck openssh-8.7p1/sshd.c
/* Prepare the channels layer */ /* Prepare the channels layer */
channel_init_channels(ssh); channel_init_channels(ssh);
channel_set_af(ssh, options.address_family); 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;
}

12
openssh.spec
View File

@ -764,6 +764,18 @@ test -f %{sysconfig_anaconda} && \
* Thu Apr 20 2023 Dmitry Belyavskiy <dbelyavs@redhat.com> - 8.7p1-30 * Thu Apr 20 2023 Dmitry Belyavskiy <dbelyavs@redhat.com> - 8.7p1-30
- Some non-terminating processes were listening on ports. - Some non-terminating processes were listening on ports.
Resolves: rhbz#2177768 Resolves: rhbz#2177768
- On sshd startup, we check whether signing using the SHA1 for signing is
available and don't use it when it isn't.
- On ssh private key conversion we explicitly use SHA2 for testing RSA keys.
- In sshd, when SHA1 signatures are unavailable, we fallback (fall forward :) )
to SHA2 on host keys proof confirmation.
- On a client side we permit SHA2-based proofs from server when requested SHA1
proof (or didn't specify the hash algorithm that implies SHA1 on the client
side). It is aligned with already present exception for RSA certificates.
- We fallback to SHA2 if SHA1 signatures is not available on the client side
(file sshconnect2.c).
- We skip dss-related tests (they don't work without SHA1).
Resolves: rhbz#2070163
* Thu Apr 06 2023 Dmitry Belyavskiy <dbelyavs@redhat.com> - 8.7p1-29 * Thu Apr 06 2023 Dmitry Belyavskiy <dbelyavs@redhat.com> - 8.7p1-29
- Resolve possible self-DoS with some clients - Resolve possible self-DoS with some clients