Eliminating remnants of SHA1 usage in OpenSSH
Resolves: rhbz#2070163
This commit is contained in:
Dmitry Belyavskiy
parent
cc7d7a5730
commit
b5ba5af997
@ -43,6 +43,255 @@ diff -up openssh-8.7p1/compat.h.sshrsacheck openssh-8.7p1/compat.h
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#define SSH_OLD_SESSIONID 0x00000010
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/* #define unused 0x00000020 */
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#define SSH_BUG_DEBUG 0x00000040
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diff -up openssh-8.7p1/monitor.c.sshrsacheck openssh-8.7p1/monitor.c
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--- openssh-8.7p1/monitor.c.sshrsacheck 2023-01-20 13:07:54.279676981 +0100
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+++ openssh-8.7p1/monitor.c 2023-01-20 15:01:07.007821379 +0100
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@@ -660,11 +660,12 @@ mm_answer_sign(struct ssh *ssh, int sock
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struct sshkey *key;
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struct sshbuf *sigbuf = NULL;
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u_char *p = NULL, *signature = NULL;
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- char *alg = NULL;
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+ char *alg = NULL, *effective_alg;
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size_t datlen, siglen, alglen;
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int r, is_proof = 0;
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u_int keyid, compat;
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const char proof_req[] = "hostkeys-prove-00@openssh.com";
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+ const char safe_rsa[] = "rsa-sha2-256";
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debug3_f("entering");
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@@ -719,18 +720,30 @@ mm_answer_sign(struct ssh *ssh, int sock
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}
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if ((key = get_hostkey_by_index(keyid)) != NULL) {
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- if ((r = sshkey_sign(key, &signature, &siglen, p, datlen, alg,
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+ if (ssh->compat & SSH_RH_RSASIGSHA && strcmp(alg, "ssh-rsa") == 0
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+ && (sshkey_type_plain(key->type) == KEY_RSA)) {
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+ effective_alg = safe_rsa;
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+ } else {
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+ effective_alg = alg;
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+ }
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+ if ((r = sshkey_sign(key, &signature, &siglen, p, datlen, effective_alg,
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options.sk_provider, NULL, compat)) != 0)
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fatal_fr(r, "sign");
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} else if ((key = get_hostkey_public_by_index(keyid, ssh)) != NULL &&
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auth_sock > 0) {
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+ if (ssh->compat & SSH_RH_RSASIGSHA && strcmp(alg, "ssh-rsa") == 0
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+ && (sshkey_type_plain(key->type) == KEY_RSA)) {
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+ effective_alg = safe_rsa;
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+ } else {
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+ effective_alg = alg;
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+ }
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if ((r = ssh_agent_sign(auth_sock, key, &signature, &siglen,
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- p, datlen, alg, compat)) != 0)
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+ p, datlen, effective_alg, compat)) != 0)
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fatal_fr(r, "agent sign");
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} else
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fatal_f("no hostkey from index %d", keyid);
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- debug3_f("%s %s signature len=%zu", alg,
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+ debug3_f("%s (effective: %s) %s signature len=%zu", alg, effective_alg,
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is_proof ? "hostkey proof" : "KEX", siglen);
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sshbuf_reset(m);
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diff -up openssh-8.7p1/regress/cert-userkey.sh.sshrsacheck openssh-8.7p1/regress/cert-userkey.sh
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--- openssh-8.7p1/regress/cert-userkey.sh.sshrsacheck 2023-01-25 14:26:52.885963113 +0100
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+++ openssh-8.7p1/regress/cert-userkey.sh 2023-01-25 14:27:25.757219800 +0100
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@@ -7,7 +7,8 @@ rm -f $OBJ/authorized_keys_$USER $OBJ/us
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cp $OBJ/sshd_proxy $OBJ/sshd_proxy_bak
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cp $OBJ/ssh_proxy $OBJ/ssh_proxy_bak
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-PLAIN_TYPES=`$SSH -Q key-plain | maybe_filter_sk | sed 's/^ssh-dss/ssh-dsa/;s/^ssh-//'`
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+#ssh-dss keys are incompatible with DEFAULT crypto policy
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+PLAIN_TYPES=`$SSH -Q key-plain | maybe_filter_sk | grep -v 'ssh-dss' | sed 's/^ssh-dss/ssh-dsa/;s/^ssh-//'`
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EXTRA_TYPES=""
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rsa=""
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diff -up openssh-8.7p1/regress/Makefile.sshrsacheck openssh-8.7p1/regress/Makefile
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--- openssh-8.7p1/regress/Makefile.sshrsacheck 2023-01-20 13:07:54.169676051 +0100
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+++ openssh-8.7p1/regress/Makefile 2023-01-20 13:07:54.290677074 +0100
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@@ -2,7 +2,8 @@
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tests: prep file-tests t-exec unit
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-REGRESS_TARGETS= t1 t2 t3 t4 t5 t6 t7 t8 t9 t10 t11 t12
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+#ssh-dss tests will not pass on DEFAULT crypto-policy because of SHA1, skipping
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+REGRESS_TARGETS= t1 t2 t3 t4 t5 t7 t8 t9 t10 t11 t12
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# File based tests
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file-tests: $(REGRESS_TARGETS)
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diff -up openssh-8.7p1/regress/test-exec.sh.sshrsacheck openssh-8.7p1/regress/test-exec.sh
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--- openssh-8.7p1/regress/test-exec.sh.sshrsacheck 2023-01-25 14:24:54.778040819 +0100
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+++ openssh-8.7p1/regress/test-exec.sh 2023-01-25 14:26:39.500858590 +0100
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@@ -581,8 +581,9 @@ maybe_filter_sk() {
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fi
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}
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-SSH_KEYTYPES=`$SSH -Q key-plain | maybe_filter_sk`
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-SSH_HOSTKEY_TYPES=`$SSH -Q key-plain | maybe_filter_sk`
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+#ssh-dss keys are incompatible with DEFAULT crypto policy
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+SSH_KEYTYPES=`$SSH -Q key-plain | maybe_filter_sk | grep -v 'ssh-dss'`
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+SSH_HOSTKEY_TYPES=`$SSH -Q key-plain | maybe_filter_sk | grep -v 'ssh-dss'`
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for t in ${SSH_KEYTYPES}; do
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# generate user key
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diff -up openssh-8.7p1/regress/unittests/kex/test_kex.c.sshrsacheck openssh-8.7p1/regress/unittests/kex/test_kex.c
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--- openssh-8.7p1/regress/unittests/kex/test_kex.c.sshrsacheck 2023-01-26 13:34:52.645743677 +0100
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+++ openssh-8.7p1/regress/unittests/kex/test_kex.c 2023-01-26 13:36:56.220745823 +0100
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@@ -97,7 +97,8 @@ do_kex_with_key(char *kex, int keytype,
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memcpy(kex_params.proposal, myproposal, sizeof(myproposal));
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if (kex != NULL)
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kex_params.proposal[PROPOSAL_KEX_ALGS] = kex;
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- keyname = strdup(sshkey_ssh_name(private));
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+ keyname = (strcmp(sshkey_ssh_name(private), "ssh-rsa")) ?
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+ strdup(sshkey_ssh_name(private)) : strdup("rsa-sha2-256");
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ASSERT_PTR_NE(keyname, NULL);
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kex_params.proposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = keyname;
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ASSERT_INT_EQ(ssh_init(&client, 0, &kex_params), 0);
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@@ -180,7 +181,7 @@ do_kex(char *kex)
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{
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#ifdef WITH_OPENSSL
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do_kex_with_key(kex, KEY_RSA, 2048);
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- do_kex_with_key(kex, KEY_DSA, 1024);
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+ /* do_kex_with_key(kex, KEY_DSA, 1024); */
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#ifdef OPENSSL_HAS_ECC
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do_kex_with_key(kex, KEY_ECDSA, 256);
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#endif /* OPENSSL_HAS_ECC */
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diff -up openssh-8.7p1/regress/unittests/sshkey/test_file.c.sshrsacheck openssh-8.7p1/regress/unittests/sshkey/test_file.c
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--- openssh-8.7p1/regress/unittests/sshkey/test_file.c.sshrsacheck 2023-01-26 12:04:55.946343408 +0100
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+++ openssh-8.7p1/regress/unittests/sshkey/test_file.c 2023-01-26 12:06:35.235164432 +0100
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@@ -110,6 +110,7 @@ sshkey_file_tests(void)
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sshkey_free(k2);
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TEST_DONE();
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+ /* Skip this test, SHA1 signatures are not supported
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TEST_START("load RSA cert with SHA1 signature");
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ASSERT_INT_EQ(sshkey_load_cert(test_data_file("rsa_1_sha1"), &k2), 0);
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ASSERT_PTR_NE(k2, NULL);
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@@ -117,7 +118,7 @@ sshkey_file_tests(void)
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ASSERT_INT_EQ(sshkey_equal_public(k1, k2), 1);
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ASSERT_STRING_EQ(k2->cert->signature_type, "ssh-rsa");
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sshkey_free(k2);
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- TEST_DONE();
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+ TEST_DONE(); */
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TEST_START("load RSA cert with SHA512 signature");
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ASSERT_INT_EQ(sshkey_load_cert(test_data_file("rsa_1_sha512"), &k2), 0);
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diff -up openssh-8.7p1/regress/unittests/sshkey/test_fuzz.c.sshrsacheck openssh-8.7p1/regress/unittests/sshkey/test_fuzz.c
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--- openssh-8.7p1/regress/unittests/sshkey/test_fuzz.c.sshrsacheck 2023-01-26 12:10:37.533168013 +0100
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+++ openssh-8.7p1/regress/unittests/sshkey/test_fuzz.c 2023-01-26 12:15:35.637631860 +0100
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@@ -333,13 +333,14 @@ sshkey_fuzz_tests(void)
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TEST_DONE();
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#ifdef WITH_OPENSSL
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+ /* Skip this test, SHA1 signatures are not supported
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TEST_START("fuzz RSA sig");
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buf = load_file("rsa_1");
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ASSERT_INT_EQ(sshkey_parse_private_fileblob(buf, "", &k1, NULL), 0);
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sshbuf_free(buf);
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sig_fuzz(k1, "ssh-rsa");
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sshkey_free(k1);
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- TEST_DONE();
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+ TEST_DONE();*/
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TEST_START("fuzz RSA SHA256 sig");
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buf = load_file("rsa_1");
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@@ -357,6 +358,7 @@ sshkey_fuzz_tests(void)
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sshkey_free(k1);
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TEST_DONE();
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+ /* Skip this test, SHA1 signatures are not supported
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TEST_START("fuzz DSA sig");
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buf = load_file("dsa_1");
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ASSERT_INT_EQ(sshkey_parse_private_fileblob(buf, "", &k1, NULL), 0);
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@@ -364,6 +366,7 @@ sshkey_fuzz_tests(void)
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sig_fuzz(k1, NULL);
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sshkey_free(k1);
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TEST_DONE();
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+ */
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#ifdef OPENSSL_HAS_ECC
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TEST_START("fuzz ECDSA sig");
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diff -up openssh-8.7p1/regress/unittests/sshkey/test_sshkey.c.sshrsacheck openssh-8.7p1/regress/unittests/sshkey/test_sshkey.c
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--- openssh-8.7p1/regress/unittests/sshkey/test_sshkey.c.sshrsacheck 2023-01-26 11:02:52.339413463 +0100
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+++ openssh-8.7p1/regress/unittests/sshkey/test_sshkey.c 2023-01-26 11:58:42.324253896 +0100
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@@ -60,6 +60,9 @@ build_cert(struct sshbuf *b, struct sshk
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u_char *sigblob;
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size_t siglen;
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+ /* ssh-rsa implies SHA1, forbidden in DEFAULT cp */
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+ int expected = (sig_alg == NULL || strcmp(sig_alg, "ssh-rsa") == 0) ? SSH_ERR_LIBCRYPTO_ERROR : 0;
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+
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ca_buf = sshbuf_new();
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ASSERT_PTR_NE(ca_buf, NULL);
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ASSERT_INT_EQ(sshkey_putb(ca_key, ca_buf), 0);
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@@ -101,8 +104,9 @@ build_cert(struct sshbuf *b, struct sshk
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ASSERT_INT_EQ(sshbuf_put_string(b, NULL, 0), 0); /* reserved */
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ASSERT_INT_EQ(sshbuf_put_stringb(b, ca_buf), 0); /* signature key */
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ASSERT_INT_EQ(sshkey_sign(sign_key, &sigblob, &siglen,
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- sshbuf_ptr(b), sshbuf_len(b), sig_alg, NULL, NULL, 0), 0);
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- ASSERT_INT_EQ(sshbuf_put_string(b, sigblob, siglen), 0); /* signature */
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+ sshbuf_ptr(b), sshbuf_len(b), sig_alg, NULL, NULL, 0), expected);
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+ if (expected == 0)
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+ ASSERT_INT_EQ(sshbuf_put_string(b, sigblob, siglen), 0); /* signature */
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free(sigblob);
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sshbuf_free(ca_buf);
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@@ -119,16 +123,22 @@ signature_test(struct sshkey *k, struct
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{
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size_t len;
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u_char *sig;
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+ /* ssh-rsa implies SHA1, forbidden in DEFAULT cp */
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+ int expected = (sig_alg && strcmp(sig_alg, "ssh-rsa") == 0) ? SSH_ERR_LIBCRYPTO_ERROR : 0;
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+ if (k && (sshkey_type_plain(k->type) == KEY_DSA || sshkey_type_plain(k->type) == KEY_DSA_CERT))
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+ expected = SSH_ERR_LIBCRYPTO_ERROR;
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ASSERT_INT_EQ(sshkey_sign(k, &sig, &len, d, l, sig_alg,
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- NULL, NULL, 0), 0);
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- ASSERT_SIZE_T_GT(len, 8);
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- ASSERT_PTR_NE(sig, NULL);
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- ASSERT_INT_EQ(sshkey_verify(k, sig, len, d, l, NULL, 0, NULL), 0);
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- ASSERT_INT_NE(sshkey_verify(bad, sig, len, d, l, NULL, 0, NULL), 0);
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- /* Fuzz test is more comprehensive, this is just a smoke test */
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- sig[len - 5] ^= 0x10;
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- ASSERT_INT_NE(sshkey_verify(k, sig, len, d, l, NULL, 0, NULL), 0);
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+ NULL, NULL, 0), expected);
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+ if (expected == 0) {
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+ ASSERT_SIZE_T_GT(len, 8);
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+ ASSERT_PTR_NE(sig, NULL);
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+ ASSERT_INT_EQ(sshkey_verify(k, sig, len, d, l, NULL, 0, NULL), 0);
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+ ASSERT_INT_NE(sshkey_verify(bad, sig, len, d, l, NULL, 0, NULL), 0);
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+ /* Fuzz test is more comprehensive, this is just a smoke test */
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+ sig[len - 5] ^= 0x10;
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+ ASSERT_INT_NE(sshkey_verify(k, sig, len, d, l, NULL, 0, NULL), 0);
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+ }
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free(sig);
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}
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@@ -514,7 +524,7 @@ sshkey_tests(void)
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ASSERT_INT_EQ(sshkey_load_public(test_data_file("rsa_1.pub"), &k2,
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NULL), 0);
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k3 = get_private("rsa_1");
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- build_cert(b, k2, "ssh-rsa-cert-v01@openssh.com", k3, k1, NULL);
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+ build_cert(b, k2, "ssh-rsa-cert-v01@openssh.com", k3, k1, "rsa-sha2-256");
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ASSERT_INT_EQ(sshkey_from_blob(sshbuf_ptr(b), sshbuf_len(b), &k4),
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SSH_ERR_KEY_CERT_INVALID_SIGN_KEY);
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ASSERT_PTR_EQ(k4, NULL);
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diff -up openssh-8.7p1/regress/unittests/sshsig/tests.c.sshrsacheck openssh-8.7p1/regress/unittests/sshsig/tests.c
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--- openssh-8.7p1/regress/unittests/sshsig/tests.c.sshrsacheck 2023-01-26 12:19:23.659513651 +0100
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+++ openssh-8.7p1/regress/unittests/sshsig/tests.c 2023-01-26 12:20:28.021044803 +0100
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@@ -102,9 +102,11 @@ tests(void)
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check_sig("rsa.pub", "rsa.sig", msg, namespace);
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TEST_DONE();
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+ /* Skip this test, SHA1 signatures are not supported
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TEST_START("check DSA signature");
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check_sig("dsa.pub", "dsa.sig", msg, namespace);
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TEST_DONE();
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+ */
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#ifdef OPENSSL_HAS_ECC
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TEST_START("check ECDSA signature");
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diff -up openssh-8.7p1/serverloop.c.sshrsacheck openssh-8.7p1/serverloop.c
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--- openssh-8.7p1/serverloop.c.sshrsacheck 2023-01-12 14:57:08.118400073 +0100
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+++ openssh-8.7p1/serverloop.c 2023-01-12 14:59:17.330470518 +0100
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@ -57,6 +306,24 @@ diff -up openssh-8.7p1/serverloop.c.sshrsacheck openssh-8.7p1/serverloop.c
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debug3_f("sign %s key (index %d) using sigalg %s",
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sshkey_type(key), ndx, sigalg == NULL ? "default" : sigalg);
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if ((r = sshbuf_put_cstring(sigbuf,
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diff -up openssh-8.7p1/sshconnect2.c.sshrsacheck openssh-8.7p1/sshconnect2.c
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--- openssh-8.7p1/sshconnect2.c.sshrsacheck 2023-01-25 15:33:29.140353651 +0100
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+++ openssh-8.7p1/sshconnect2.c 2023-01-25 15:59:34.225364883 +0100
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@@ -1461,6 +1464,14 @@ identity_sign(struct identity *id, u_cha
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retried = 1;
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goto retry_pin;
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}
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+ if ((r == SSH_ERR_LIBCRYPTO_ERROR) && strcmp("ssh-rsa", alg)) {
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+ char rsa_safe_alg[] = "rsa-sha2-512";
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+ debug3_f("trying to fallback to algorithm %s", rsa_safe_alg);
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+
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+ if ((r = sshkey_sign(sign_key, sigp, lenp, data, datalen,
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+ rsa_safe_alg, options.sk_provider, pin, compat)) != 0)
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+ debug_fr(r, "sshkey_sign - RSA fallback");
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+ }
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goto out;
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}
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diff -up openssh-8.7p1/sshd.c.sshrsacheck openssh-8.7p1/sshd.c
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--- openssh-8.7p1/sshd.c.sshrsacheck 2023-01-12 13:29:06.355711140 +0100
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+++ openssh-8.7p1/sshd.c 2023-01-12 13:29:06.358711178 +0100
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@ -68,7 +335,7 @@ diff -up openssh-8.7p1/sshd.c.sshrsacheck openssh-8.7p1/sshd.c
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#ifdef HAVE_SECUREWARE
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(void)set_auth_parameters(ac, av);
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@@ -1938,6 +1950,19 @@ main(int ac, char **av)
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@@ -1938,6 +1950,33 @@ main(int ac, char **av)
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key = NULL;
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continue;
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}
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@ -78,12 +345,26 @@ diff -up openssh-8.7p1/sshd.c.sshrsacheck openssh-8.7p1/sshd.c
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+ u_char data[] = "Test SHA1 vector";
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+ int res;
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+
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+ res = ssh_rsa_sign(key, &tmp, &sign_size, data, sizeof(data), NULL);
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+ res = sshkey_sign(key, &tmp, &sign_size, data, sizeof(data), NULL, NULL, NULL, 0);
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+ free(tmp);
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+ if (res == SSH_ERR_LIBCRYPTO_ERROR) {
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+ logit_f("sshd: ssh-rsa algorithm is disabled");
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+ verbose_f("sshd: SHA1 in signatures is disabled for RSA keys");
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+ forbid_ssh_rsa = 1;
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+ }
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+ }
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+ if (key && (sshkey_type_plain(key->type) == KEY_DSA || sshkey_type_plain(key->type) == KEY_DSA_CERT)) {
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+ size_t sign_size = 0;
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+ u_char *tmp = NULL;
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+ u_char data[] = "Test SHA1 vector";
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+ int res;
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+
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+ res = sshkey_sign(key, &tmp, &sign_size, data, sizeof(data), NULL, NULL, NULL, 0);
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+ 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) {
|
||||
@ -98,3 +379,48 @@ diff -up openssh-8.7p1/sshd.c.sshrsacheck openssh-8.7p1/sshd.c
|
||||
/* 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;
|
||||
}
|
||||
|
||||
12
openssh.spec
12
openssh.spec
@ -764,6 +764,18 @@ test -f %{sysconfig_anaconda} && \
|
||||
* Thu Apr 20 2023 Dmitry Belyavskiy <dbelyavs@redhat.com> - 8.7p1-30
|
||||
- Some non-terminating processes were listening on ports.
|
||||
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
|
||||
- Resolve possible self-DoS with some clients
|
||||
|
||||
Loading…
Reference in New Issue
Block a user