qga: add ssh-get-authorized-keys

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
*fix-up merge conflicts due to qga-ssh-test being disabled in earlier
 patch due to G_TEST_OPTION_ISOLATE_DIRS triggering build-oss-fuzz
 leak detector.
*fix up style and disallowed g_assert* usage reported by checkpatch
Signed-off-by: Michael Roth <michael.roth@amd.com>

qga/commands-posix-ssh.c

@@ -268,6 +268,46 @@ qmp_guest_ssh_remove_authorized_keys(const char *username, strList *keys,
     write_authkeys(authkeys_path, new_keys, p, errp);
 }
 
+GuestAuthorizedKeys *
+qmp_guest_ssh_get_authorized_keys(const char *username, Error **errp)
+{
+    g_autofree struct passwd *p = NULL;
+    g_autofree char *authkeys_path = NULL;
+    g_auto(GStrv) authkeys = NULL;
+    g_autoptr(GuestAuthorizedKeys) ret = NULL;
+    int i;
+
+    ERRP_GUARD();
+
+    p = get_passwd_entry(username, errp);
+    if (p == NULL) {
+        return NULL;
+    }
+
+    authkeys_path = g_build_filename(p->pw_dir, ".ssh",
+                                     "authorized_keys", NULL);
+    authkeys = read_authkeys(authkeys_path, errp);
+    if (authkeys == NULL) {
+        return NULL;
+    }
+
+    ret = g_new0(GuestAuthorizedKeys, 1);
+    for (i = 0; authkeys[i] != NULL; i++) {
+        strList *new;
+
+        g_strstrip(authkeys[i]);
+        if (!authkeys[i][0] || authkeys[i][0] == '#') {
+            continue;
+        }
+
+        new = g_new0(strList, 1);
+        new->value = g_strdup(authkeys[i]);
+        new->next = ret->keys;
+        ret->keys = new;
+    }
+
+    return g_steal_pointer(&ret);
+}
 
 #ifdef QGA_BUILD_UNIT_TEST
 #if GLIB_CHECK_VERSION(2, 60, 0)
@@ -426,6 +466,31 @@ test_remove_keys(void)
                                "algo some-key another\n");
 }
 
+static void
+test_get_keys(void)
+{
+    Error *err = NULL;
+    static const char *authkeys =
+        "algo key1 comments\n"
+        "# a commented line\n"
+        "algo some-key another\n";
+    g_autoptr(GuestAuthorizedKeys) ret = NULL;
+    strList *k;
+    size_t len = 0;
+
+    test_authorized_keys_set(authkeys);
+
+    ret = qmp_guest_ssh_get_authorized_keys(g_get_user_name(), &err);
+    g_assert(err == NULL);
+
+    for (len = 0, k = ret->keys; k != NULL; k = k->next) {
+        g_assert(g_str_has_prefix(k->value, "algo "));
+        len++;
+    }
+
+    g_assert(len == 2);
+}
+
 int main(int argc, char *argv[])
 {
     setlocale(LC_ALL, "");
@@ -437,6 +502,7 @@ int main(int argc, char *argv[])
     g_test_add_func("/qga/ssh/add_keys", test_add_keys);
     g_test_add_func("/qga/ssh/add_reset_keys", test_add_reset_keys);
     g_test_add_func("/qga/ssh/remove_keys", test_remove_keys);
+    g_test_add_func("/qga/ssh/get_keys", test_get_keys);
 
     return g_test_run();
 }

qga/meson.build

@@ -95,8 +95,15 @@ test_env.set('G_TEST_BUILDDIR', meson.current_build_dir())
 # issue is identified/fix
 #if 'CONFIG_POSIX' in config_host
 if false
-  qga_ssh_test = executable('qga-ssh-test',
-                            files('commands-posix-ssh.c'),
+  srcs = [files('commands-posix-ssh.c')]
+  i = 0
+  foreach output: qga_qapi_outputs
+    if output.startswith('qga-qapi-types') or output.startswith('qga-qapi-visit')
+      srcs += qga_qapi_files[i]
+    endif
+    i = i + 1
+  endforeach
+  qga_ssh_test = executable('qga-ssh-test', srcs,
                             dependencies: [qemuutil],
                             c_args: ['-DQGA_BUILD_UNIT_TEST'])
 

qga/qapi-schema.json

@@ -1347,6 +1347,37 @@
 { 'command': 'guest-get-devices',
   'returns': ['GuestDeviceInfo'] }
 
+##
+# @GuestAuthorizedKeys:
+#
+# @keys: public keys (in OpenSSH/sshd(8) authorized_keys format)
+#
+# Since: 5.2
+##
+{ 'struct': 'GuestAuthorizedKeys',
+  'data': {
+      'keys': ['str']
+  },
+  'if': 'defined(CONFIG_POSIX)' }
+
+
+##
+# @guest-ssh-get-authorized-keys:
+#
+# @username: the user account to add the authorized keys
+#
+# Return the public keys from user .ssh/authorized_keys on Unix systems (not
+# implemented for other systems).
+#
+# Returns: @GuestAuthorizedKeys
+#
+# Since: 5.2
+##
+{ 'command': 'guest-ssh-get-authorized-keys',
+  'data': { 'username': 'str' },
+  'returns': 'GuestAuthorizedKeys',
+  'if': 'defined(CONFIG_POSIX)' }
+
 ##
 # @guest-ssh-add-authorized-keys:
 #