diff --git a/frontend/src/components/dialog/share-dialog.js b/frontend/src/components/dialog/share-dialog.js
index 4848c7a088..f2b9f526d3 100644
--- a/frontend/src/components/dialog/share-dialog.js
+++ b/frontend/src/components/dialog/share-dialog.js
@@ -1,7 +1,7 @@
 import React, { Fragment } from 'react';
 import PropTypes from 'prop-types';
 import { Modal, ModalHeader, ModalBody, TabContent, TabPane, Nav, NavItem, NavLink } from 'reactstrap';
-import { gettext, username, canGenerateShareLink, canGenerateUploadLink, canInvitePeople, additionalShareDialogNote, enableOCM, isPro } from '../../utils/constants';
+import { gettext, username, canGenerateShareLink, canGenerateUploadLink, canInvitePeople, additionalShareDialogNote, enableOCM, isPro, canShareRepo } from '../../utils/constants';
 import ShareLinkPanel from '../share-link-panel';
 import GenerateUploadLink from './generate-upload-link';
 import ShareToUser from './share-to-user';
@@ -131,17 +131,21 @@ class ShareDialog extends React.Component {
             }
             {enableDirPrivateShare &&
               <Fragment>
-                <NavItem role="tab" aria-selected={activeTab === 'shareToUser'} aria-controls="share-to-user-panel">
-                  <NavLink className={activeTab === 'shareToUser' ? 'active' : ''} onClick={this.toggle.bind(this, 'shareToUser')} tabIndex="0" onKeyDown={this.onTabKeyDown}>
-                    {gettext('Share to user')}
-                  </NavLink>
-                </NavItem>
-                <NavItem role="tab" aria-selected={activeTab === 'shareToGroup'} aria-controls="share-to-group-panel">
-                  <NavLink className={activeTab === 'shareToGroup' ? 'active' : ''} onClick={this.toggle.bind(this, 'shareToGroup')} tabIndex="0" onKeyDown={this.onTabKeyDown}>
-                    {gettext('Share to group')}
-                  </NavLink>
-                </NavItem>
-                {isPro && !isCustomPermission && (
+                { canShareRepo && (
+                  <NavItem role="tab" aria-selected={activeTab === 'shareToUser'} aria-controls="share-to-user-panel">
+                    <NavLink className={activeTab === 'shareToUser' ? 'active' : ''} onClick={this.toggle.bind(this, 'shareToUser')} tabIndex="0" onKeyDown={this.onTabKeyDown}>
+                      {gettext('Share to user')}
+                    </NavLink>
+                  </NavItem>
+                )}
+                { canShareRepo && (
+                  <NavItem role="tab" aria-selected={activeTab === 'shareToGroup'} aria-controls="share-to-group-panel">
+                    <NavLink className={activeTab === 'shareToGroup' ? 'active' : ''} onClick={this.toggle.bind(this, 'shareToGroup')} tabIndex="0" onKeyDown={this.onTabKeyDown}>
+                      {gettext('Share to group')}
+                    </NavLink>
+                  </NavItem>
+                )}
+                {isPro && !isCustomPermission && canShareRepo && (
                   <NavItem role="tab" aria-selected={activeTab === 'customSharePermission'} aria-controls="custom-share-perm-panel">
                     <NavLink className={activeTab === 'customSharePermission' ? 'active' : ''} onClick={this.toggle.bind(this, 'customSharePermission')} tabIndex="0" onKeyDown={this.onTabKeyDown}>
                       {gettext('Custom sharing permissions')}
diff --git a/frontend/src/components/main-side-nav.js b/frontend/src/components/main-side-nav.js
index 5faf778594..a6eb591bf1 100644
--- a/frontend/src/components/main-side-nav.js
+++ b/frontend/src/components/main-side-nav.js
@@ -1,7 +1,7 @@
 import React from 'react';
 import PropTypes from 'prop-types';
 import { Link } from '@gatsbyjs/reach-router';
-import { gettext, siteRoot, canAddRepo, canGenerateShareLink, canGenerateUploadLink, canInvitePeople, enableOCM, enableOCMViaWebdav } from '../utils/constants';
+import { gettext, siteRoot, canAddRepo, canShareRepo, canGenerateShareLink, canGenerateUploadLink, canInvitePeople, enableOCM, enableOCMViaWebdav } from '../utils/constants';
 import { seafileAPI } from '../utils/seafile-api';
 import { Utils } from '../utils/utils';
 import toaster from './toast';
@@ -138,7 +138,7 @@ class MainSideNav extends React.Component {
     }
     return (
       <ul className={`nav sub-nav nav-pills flex-column ${this.state.sharedExtended ? 'side-panel-slide' : 'side-panel-slide-up'}`} style={style} >
-        {canAddRepo && (
+        {canAddRepo && canShareRepo && (
           <li className="nav-item">
             <Link to={siteRoot + 'share-admin-libs/'} className={`nav-link ellipsis ${this.getActiveClass('share-admin-libs')}`} title={gettext('Libraries')} onClick={(e) => this.tabItemClick(e, 'share-admin-libs')}>
               <span aria-hidden="true" className="sharp">#</span>
@@ -146,12 +146,14 @@ class MainSideNav extends React.Component {
             </Link>
           </li>
         )}
-        <li className="nav-item">
-          <Link to={siteRoot + 'share-admin-folders/'} className={`nav-link ellipsis ${this.getActiveClass('share-admin-folders')}`} title={gettext('Folders')} onClick={(e) => this.tabItemClick(e, 'share-admin-folders')}>
-            <span aria-hidden="true" className="sharp">#</span>
-            <span className="nav-text">{gettext('Folders')}</span>
-          </Link>
-        </li>
+        {canShareRepo && (
+          <li className="nav-item">
+            <Link to={siteRoot + 'share-admin-folders/'} className={`nav-link ellipsis ${this.getActiveClass('share-admin-folders')}`} title={gettext('Folders')} onClick={(e) => this.tabItemClick(e, 'share-admin-folders')}>
+              <span aria-hidden="true" className="sharp">#</span>
+              <span className="nav-text">{gettext('Folders')}</span>
+            </Link>
+          </li>
+        )}
         {linksNavItem}
       </ul>
     );
diff --git a/frontend/src/utils/constants.js b/frontend/src/utils/constants.js
index 4fdae8c652..d77fe24b1d 100644
--- a/frontend/src/utils/constants.js
+++ b/frontend/src/utils/constants.js
@@ -37,6 +37,7 @@ export const name = window.app.pageOptions.name;
 export const contactEmail = window.app.pageOptions.contactEmail;
 export const username = window.app.pageOptions.username;
 export const canAddRepo = window.app.pageOptions.canAddRepo;
+export const canShareRepo = window.app.pageOptions.canShareRepo;
 export const canAddGroup = window.app.pageOptions.canAddGroup;
 export const groupImportMembersExtraMsg = window.app.pageOptions.groupImportMembersExtraMsg;
 export const canGenerateShareLink = window.app.pageOptions.canGenerateShareLink;
diff --git a/seahub/api2/endpoints/custom_share_permissions.py b/seahub/api2/endpoints/custom_share_permissions.py
index cf259fd401..66cff48d65 100644
--- a/seahub/api2/endpoints/custom_share_permissions.py
+++ b/seahub/api2/endpoints/custom_share_permissions.py
@@ -29,6 +29,9 @@ class CustomSharePermissionsView(APIView):
         """List custom share permissions
         """
         # permission check
+        if not request.user.permissions.can_share_repo():
+            return api_error(status.HTTP_403_FORBIDDEN, 'Permission denied.')
+        
         if not check_folder_permission(request, repo_id, '/'):
             error_msg = 'Permission denied.'
             return api_error(status.HTTP_403_FORBIDDEN, error_msg)
@@ -53,6 +56,9 @@ class CustomSharePermissionsView(APIView):
     def post(self, request, repo_id):
         """Add a custom share permission
         """
+        if not request.user.permissions.can_share_repo():
+            return api_error(status.HTTP_403_FORBIDDEN, 'Permission denied.')
+        
         username = request.user.username
         # argument check
         permission = request.data.get('permission', None)
@@ -98,6 +104,9 @@ class CustomSharePermissionView(APIView):
         """get a custom share permission
         """
         # permission check
+        if not request.user.permissions.can_share_repo():
+            return api_error(status.HTTP_403_FORBIDDEN, 'Permission denied.')
+        
         if not check_folder_permission(request, repo_id, '/'):
             error_msg = 'Permission denied.'
             return api_error(status.HTTP_403_FORBIDDEN, error_msg)
@@ -122,6 +131,9 @@ class CustomSharePermissionView(APIView):
         """Update a custom share permission
         """
         # argument check
+        if not request.user.permissions.can_share_repo():
+            return api_error(status.HTTP_403_FORBIDDEN, 'Permission denied.')
+        
         permission = request.data.get('permission', None)
         if not permission:
             error_msg = 'permission invalid.'
@@ -170,6 +182,9 @@ class CustomSharePermissionView(APIView):
     def delete(self, request, repo_id, permission_id):
         """Delete a custom share permission
         """
+        if not request.user.permissions.can_share_repo():
+            return api_error(status.HTTP_403_FORBIDDEN, 'Permission denied.')
+        
         username = request.user.username
 
         # permission check
diff --git a/seahub/api2/endpoints/dir_shared_items.py b/seahub/api2/endpoints/dir_shared_items.py
index dd85799e72..79bfbc863d 100644
--- a/seahub/api2/endpoints/dir_shared_items.py
+++ b/seahub/api2/endpoints/dir_shared_items.py
@@ -61,10 +61,13 @@ class DirSharedItemsEndpoint(APIView):
             org_id = request.user.org.org_id
             if path == '/':
                 share_items = seafile_api.list_org_repo_shared_to(org_id,
-                        repo_owner, repo_id)
+                                                                  repo_owner,
+                                                                  repo_id)
             else:
                 share_items = seafile_api.get_org_shared_users_for_subdir(org_id,
-                        repo_id, path, repo_owner)
+                                                                          repo_id,
+                                                                          path,
+                                                                          repo_owner)
         else:
             repo_owner = seafile_api.get_repo_owner(repo_id)
             if path == '/':
@@ -98,10 +101,13 @@ class DirSharedItemsEndpoint(APIView):
             org_id = request.user.org.org_id
             if path == '/':
                 share_items = seafile_api.list_org_repo_shared_group(org_id,
-                        repo_owner, repo_id)
+                                                                     repo_owner,
+                                                                     repo_id)
             else:
                 share_items = seafile_api.get_org_shared_groups_for_subdir(org_id,
-                        repo_id, path, repo_owner)
+                                                                           repo_id,
+                                                                           path,
+                                                                           repo_owner)
         else:
             repo_owner = seafile_api.get_repo_owner(repo_id)
             if path == '/':
@@ -129,11 +135,10 @@ class DirSharedItemsEndpoint(APIView):
                                 org_id, repo_id, path, repo_owner, group_id)
                 else:
                     if path == '/':
-                        seafile_api.unset_group_repo(repo_id, group_id,
-                                repo_owner)
+                        seafile_api.unset_group_repo(repo_id, group_id, repo_owner)
                     else:
-                        seafile_api.unshare_subdir_for_group(
-                                repo_id, path, repo_owner, group_id)
+                        seafile_api.unshare_subdir_for_group(repo_id, path,
+                                                             repo_owner, group_id)
                 continue
 
             ret.append({
@@ -197,6 +202,9 @@ class DirSharedItemsEndpoint(APIView):
     def get(self, request, repo_id, format=None):
         """List shared items(shared to users/groups) for a folder/library.
         """
+        if not request.user.permissions.can_share_repo():
+            return api_error(status.HTTP_403_FORBIDDEN, 'Permission denied.')
+        
         repo = seafile_api.get_repo(repo_id)
         if not repo:
             return api_error(status.HTTP_404_NOT_FOUND, 'Library %s not found.' % repo_id)
@@ -220,6 +228,9 @@ class DirSharedItemsEndpoint(APIView):
     def post(self, request, repo_id, format=None):
         """Update shared item permission.
         """
+        if not request.user.permissions.can_share_repo():
+            return api_error(status.HTTP_403_FORBIDDEN, 'Permission denied.')
+
         username = request.user.username
         repo = seafile_api.get_repo(repo_id)
         if not repo:
@@ -305,6 +316,10 @@ class DirSharedItemsEndpoint(APIView):
                             content_type=json_content_type)
 
     def put(self, request, repo_id, format=None):
+
+        if not request.user.permissions.can_share_repo():
+            return api_error(status.HTTP_403_FORBIDDEN, 'Permission denied.')
+
         username = request.user.username
         repo = seafile_api.get_repo(repo_id)
         if not repo:
@@ -368,8 +383,7 @@ class DirSharedItemsEndpoint(APIView):
 
                         if not is_org_user(to_user, int(org_id)):
                             org_name = request.user.org.org_name
-                            error_msg = 'User %s is not member of organization %s.' \
-                                    % (to_user, org_name)
+                            error_msg = f'User {to_user} is not member of organization {org_name}.'
 
                             result['failed'].append({
                                 'email': to_user,
@@ -377,7 +391,8 @@ class DirSharedItemsEndpoint(APIView):
                             })
                             continue
 
-                        # when calling seafile API to share authority related functions, change the uesrname to repo owner.
+                        # when calling seafile API to share authority related functions,
+                        # change the uesrname to repo owner.
                         repo_owner = seafile_api.get_org_repo_owner(repo_id)
                         # can't share to owner
                         if to_user == repo_owner:
@@ -477,7 +492,8 @@ class DirSharedItemsEndpoint(APIView):
                 try:
                     org_id = None
                     if is_org_context(request):
-                        # when calling seafile API to share authority related functions, change the uesrname to repo owner.
+                        # when calling seafile API to share authority related functions,
+                        # change the uesrname to repo owner.
                         repo_owner = seafile_api.get_org_repo_owner(repo_id)
                         org_id = request.user.org.org_id
 
@@ -513,9 +529,14 @@ class DirSharedItemsEndpoint(APIView):
                     continue
 
         return HttpResponse(json.dumps(result),
-            status=200, content_type=json_content_type)
+                            status=200,
+                            content_type=json_content_type)
 
     def delete(self, request, repo_id, format=None):
+
+        if not request.user.permissions.can_share_repo():
+            return api_error(status.HTTP_403_FORBIDDEN, 'Permission denied.')
+
         username = request.user.username
         repo = seafile_api.get_repo(repo_id)
         if not repo:
@@ -556,7 +577,7 @@ class DirSharedItemsEndpoint(APIView):
 
             # Delete share permission at ExtraSharePermission table.
             if path == '/':
-                ExtraSharePermission.objects.delete_share_permission(repo_id, 
+                ExtraSharePermission.objects.delete_share_permission(repo_id,
                                                                      shared_to)
 
             org_id = None
@@ -601,8 +622,8 @@ class DirSharedItemsEndpoint(APIView):
 
             # delete share permission if repo is deleted
             if path == '/':
-                ExtraGroupsSharePermission.objects.delete_share_permission(repo_id, 
-                                                                          group_id)
+                ExtraGroupsSharePermission.objects.delete_share_permission(repo_id,
+                                                                           group_id)
             send_perm_audit_msg('delete-repo-perm', username, group_id,
                                 repo_id, path, permission)
 
diff --git a/seahub/api2/endpoints/shared_folders.py b/seahub/api2/endpoints/shared_folders.py
index 1216932c2e..8e84372f10 100644
--- a/seahub/api2/endpoints/shared_folders.py
+++ b/seahub/api2/endpoints/shared_folders.py
@@ -33,6 +33,8 @@ class SharedFolders(APIView):
         Permission checking:
         1. all authenticated user can perform this action.
         """
+        if not request.user.permissions.can_share_repo():
+            return api_error(status.HTTP_403_FORBIDDEN, 'Permission denied.')
 
         shared_repos = []
         username = request.user.username
diff --git a/seahub/api2/endpoints/shared_repos.py b/seahub/api2/endpoints/shared_repos.py
index d9fb9ec8f3..7b91c21ced 100644
--- a/seahub/api2/endpoints/shared_repos.py
+++ b/seahub/api2/endpoints/shared_repos.py
@@ -38,6 +38,8 @@ class SharedRepos(APIView):
         Permission checking:
         1. all authenticated user can perform this action.
         """
+        if not request.user.permissions.can_share_repo():
+            return api_error(status.HTTP_403_FORBIDDEN, 'Permission denied.')
 
         shared_repos = []
         username = request.user.username
@@ -128,6 +130,9 @@ class SharedRepo(APIView):
         Permission checking:
         1. Only repo owner can update.
         """
+        
+        if not request.user.permissions.can_share_repo():
+            return api_error(status.HTTP_403_FORBIDDEN, 'Permission denied.')
 
         # argument check
         permission = request.data.get('permission', None)
@@ -244,7 +249,9 @@ class SharedRepo(APIView):
         Permission checking:
         1. Only repo owner and system admin can unshare a publib library.
         """
-
+        if not request.user.permissions.can_share_repo():
+            return api_error(status.HTTP_403_FORBIDDEN, 'Permission denied.')
+        
         # argument check
         share_type = request.GET.get('share_type', None)
         if not share_type:
diff --git a/seahub/base/accounts.py b/seahub/base/accounts.py
index a7e5d8e2be..afdf06d0d5 100644
--- a/seahub/base/accounts.py
+++ b/seahub/base/accounts.py
@@ -359,6 +359,9 @@ class UserPermissions(object):
     def can_add_repo(self):
         return self._get_perm_by_roles('can_add_repo')
 
+    def can_share_repo(self):
+        return self._get_perm_by_roles('can_share_repo')
+
     def can_add_group(self):
         return self._get_perm_by_roles('can_add_group')
 
diff --git a/seahub/role_permissions/settings.py b/seahub/role_permissions/settings.py
index 57d846fff4..479ea6fd37 100644
--- a/seahub/role_permissions/settings.py
+++ b/seahub/role_permissions/settings.py
@@ -27,6 +27,7 @@ def merge_roles(default, custom):
 DEFAULT_ENABLED_ROLE_PERMISSIONS = {
     DEFAULT_USER: {
         'can_add_repo': True,
+        'can_share_repo': True,
         'can_add_group': True,
         'can_view_org': True,
         'can_add_public_repo': False,
@@ -48,6 +49,7 @@ DEFAULT_ENABLED_ROLE_PERMISSIONS = {
     },
     GUEST_USER: {
         'can_add_repo': False,
+        'can_share_repo': False,
         'can_add_group': False,
         'can_view_org': False,
         'can_add_public_repo': False,
diff --git a/seahub/templates/base_for_react.html b/seahub/templates/base_for_react.html
index 952c0fc906..b87bf56e8e 100644
--- a/seahub/templates/base_for_react.html
+++ b/seahub/templates/base_for_react.html
@@ -62,6 +62,7 @@
             guideEnabled: {% if guide_enabled %} true {% else %} false {% endif %},
             trashReposExpireDays: {% if trash_repos_expire_days >= 0 %} {{ trash_repos_expire_days }} {% else %} null {% endif %},
             canAddRepo: {% if user.permissions.can_add_repo %} true {% else %} false {% endif %},
+            canShareRepo: {% if user.permissions.can_share_repo %} true {% else %} false {% endif %},
             canAddGroup: {% if user.permissions.can_add_group %} true {% else %} false {% endif %},
             groupImportMembersExtraMsg: "{{group_import_members_extra_msg}}",
             canGenerateShareLink: {% if user.permissions.can_generate_share_link %} true {% else %} false {% endif %},
diff --git a/tests/seahub/role_permissions/test_utils.py b/tests/seahub/role_permissions/test_utils.py
index a24bfd8d6b..4f0a03a780 100644
--- a/tests/seahub/role_permissions/test_utils.py
+++ b/tests/seahub/role_permissions/test_utils.py
@@ -11,4 +11,4 @@ class UtilsTest(BaseTestCase):
         assert DEFAULT_USER in get_available_roles()
 
     def test_get_enabled_role_permissions_by_role(self):
-        assert len(list(get_enabled_role_permissions_by_role(DEFAULT_USER).keys())) == 19
+        assert len(list(get_enabled_role_permissions_by_role(DEFAULT_USER).keys())) == 20