diff --git a/frontend/src/js/component/wb-collection-listing.js b/frontend/src/js/component/wb-collection-listing.js
index f0eaa27..6e01e6a 100644
--- a/frontend/src/js/component/wb-collection-listing.js
+++ b/frontend/src/js/component/wb-collection-listing.js
@@ -22,7 +22,7 @@ class WBCollectionListing extends Component {
 
   prepareRows(items, ownerLookup) {
     let { app, renderRenameLink, renderDeleteButton,
-      renderSelectionCell } = this.props;
+      renderSelectionCell, renderSharingButton } = this.props;
 
     return items.map(item => [
       renderSelectionCell(item),
@@ -59,6 +59,8 @@ class WBCollectionListing extends Component {
         </a>
 
         { renderDeleteButton(item, () => this.fetchItems()) }
+
+        { renderSharingButton(item) }
       </div>)
     ]);
   }
diff --git a/frontend/src/js/component/wb-process-listing.js b/frontend/src/js/component/wb-process-listing.js
index 7c1f3df..3228ed1 100644
--- a/frontend/src/js/component/wb-process-listing.js
+++ b/frontend/src/js/component/wb-process-listing.js
@@ -29,7 +29,7 @@ class WBProcessListing extends Component {
 
   prepareRows(requests, containerLookup, ownerLookup, outputLookup) {
     const { app, renderRenameLink, renderDeleteButton,
-      renderSelectionCell } = this.props;
+      renderSelectionCell, renderSharingButton } = this.props;
     return requests.map(item => {
       return ( [
         renderSelectionCell(item),
@@ -47,6 +47,7 @@ class WBProcessListing extends Component {
         ( <WBNameAndUuid app={ app } uuid={ item['output_uuid'] } /> ),
         (<div>
           { renderDeleteButton(item, () => this.fetchItems()) }
+          { renderSharingButton(item) }
         </div>)
       ] );
     });
diff --git a/frontend/src/js/component/wb-workflow-listing.js b/frontend/src/js/component/wb-workflow-listing.js
index dbb7fcd..4dbea55 100644
--- a/frontend/src/js/component/wb-workflow-listing.js
+++ b/frontend/src/js/component/wb-workflow-listing.js
@@ -22,7 +22,7 @@ class WBWorkflowListing extends Component {
 
   prepareRows(items, ownerLookup) {
     const { renderRenameLink, renderDeleteButton,
-      renderSelectionCell } = this.props;
+      renderSelectionCell, renderSharingButton } = this.props;
     return items.map(item => [
       renderSelectionCell(item),
       (
@@ -43,6 +43,7 @@ class WBWorkflowListing extends Component {
           href={ urlForObject(item, 'launch') }><i class="fas fa-running"></i></a>
         <button class="btn btn-outline-primary mx-1 my-1" title="View"><i class="far fa-eye"></i></button>
         { renderDeleteButton(item, () => this.fetchItems()) }
+        { renderSharingButton(item) }
       </div>)
     ]);
   }
diff --git a/frontend/src/js/page/wb-browse.js b/frontend/src/js/page/wb-browse.js
index aad22eb..eb83941 100644
--- a/frontend/src/js/page/wb-browse.js
+++ b/frontend/src/js/page/wb-browse.js
@@ -194,7 +194,8 @@ class WBBrowse extends Component {
               getPageUrl={ i => this.getUrl({ 'collectionPage': i }) }
               renderRenameLink={ (it, cb) => this.renderRenameLink(it, cb) }
               renderDeleteButton={ (it, cb) => this.renderDeleteButton(it, cb) }
-              renderSelectionCell={ it => this.renderSelectionCell(it) } />
+              renderSelectionCell={ it => this.renderSelectionCell(it) }
+              renderSharingButton={ it => this.renderSharingButton(it) } />
 
           ) : (objTypeTab === 'process') ? (
             <WBProcessListing app={ app }
@@ -205,7 +206,8 @@ class WBBrowse extends Component {
               onPageChanged={ i => this.route({ 'processPage': i }) }
               renderRenameLink={ (it, cb) => this.renderRenameLink(it, cb) }
               renderDeleteButton={ (it, cb) => this.renderDeleteButton(it, cb) }
-              renderSelectionCell={ it => this.renderSelectionCell(it) } />
+              renderSelectionCell={ it => this.renderSelectionCell(it) }
+              renderSharingButton={ it => this.renderSharingButton(it) } />
 
           ) : (objTypeTab === 'workflow') ? (
             <WBWorkflowListing app={ app }
@@ -215,7 +217,8 @@ class WBBrowse extends Component {
               getPageUrl={ i => this.getUrl({ 'workflowPage': i }) }
               renderRenameLink={ (it, cb) => this.renderRenameLink(it, cb) }
               renderDeleteButton={ (it, cb) => this.renderDeleteButton(it, cb) }
-              renderSelectionCell={ it => this.renderSelectionCell(it) } />
+              renderSelectionCell={ it => this.renderSelectionCell(it) }
+              renderSharingButton={ it => this.renderSharingButton(it) } />
 
           ) : null
         }
diff --git a/frontend/src/js/page/wb-sharing-page.js b/frontend/src/js/page/wb-sharing-page.js
index 3ef7193..4a4562d 100644
--- a/frontend/src/js/page/wb-sharing-page.js
+++ b/frontend/src/js/page/wb-sharing-page.js
@@ -22,37 +22,116 @@ class WBSharingPage extends Component {
     const { app, uuid } = this.props;
     const { arvHost, arvToken } = app.state;
     let prom = makeArvadosRequest(arvHost, arvToken,
-      '/arvados/v1/permissions/' + encodeURIComponent(uuid));
+      '/arvados/v1/permissions/' + encodeURIComponent(uuid) +
+      '?limit=100000');
     prom = prom.then(xhr => this.setState({
+      'entries': xhr.response.items,
       'rows': this.prepareRows(xhr.response.items)
     }));
   }
 
-  deletePermission(uuid) {
-    throw Error('Not implemented');
+  deleteEntry(it) {
+    it._delete = true;
+    this.setState({ rows: this.prepareRows(this.state.entries) });
   }
 
   prepareRows(items) {
     const { app } = this.props;
-    return items.map(it => [
+    return items.filter(it => (!it._delete)).map(it => [
       ( <WBNameAndUuid app={ app } uuid={ it.tail_uuid } /> ),
-      ( <WBSelect value={ it.name } options={ ['can_read', 'can_write', 'can_manage'] } /> ),
+      ( <WBSelect value={ it.name }
+          options={ ['can_read', 'can_write', 'can_manage'] }
+          onChange={ e => this.modifyEntry(it, e.target.value) } /> ),
       ( <button class="btn btn-outline-danger m-1" title="Delete"
-        onclick={ () => this.deletePermission(it.uuid) }>
+        onclick={ () => this.deleteEntry(it) }>
         <i class="fas fa-trash"></i>
       </button> )
     ]);
   }
 
-  addEntry(it) {
-    throw Error('Not implemented');
+  modifyEntry(it, newPermissionName) {
+    it.name = newPermissionName;
+    it._dirty = true;
+    // this.setState({ rows: this.prepareRows(this.state.entries) });
+  }
+
+  addEntry(it, permissionName='can_read') {
+    // throw Error('Not implemented');
+    const { uuid } = this.props;
+    let { entries } = this.state;
+    if (entries.filter(e => (e.tail_uuid === it.uuid)).length > 0)
+      return; // already in the list
+    const e = {
+      //_dirty: true,
+      link_class: 'permission',
+      head_uuid: uuid,
+      tail_uuid: it.uuid,
+      name: permissionName
+    };
+    entries = entries.concat([e]);
+    this.setState({
+      entries,
+      rows: this.prepareRows(entries)
+    });
+  }
+
+  disableControls() {
+    $('input, select, button').attr('disabled', 'disabled');
+    $('a').each(function() { $(this).data('old_href', $(this).attr('href')); });
+    $('a').attr('href', null);
+  }
+
+  enableControls() {
+    $('input, select, button').attr('disabled', null);
+    $('a').each(function() { $(this).attr('href', $(this).data('old_href')); });
   }
 
   save() {
-    throw Error('Not implemented');
+    const { entries } = this.state;
+    const { arvHost, arvToken } = this.props.app.state;
+    let prom = new Promise(accept => accept());
+    this.disableControls();
+    this.setState({ working: true });
+    for (let i = 0; i < entries.length; i++) {
+      const e = entries[i];
+
+      //if (!e._dirty && !e._delete)
+        //continue;
+
+      if (!e.uuid) {
+        prom = prom.then(() => makeArvadosRequest(arvHost, arvToken,
+          '/arvados/v1/links',
+          { 'method': 'POST',
+            'data': JSON.stringify({
+              'link_class': 'permission',
+              'head_uuid': e.head_uuid,
+              'tail_uuid': e.tail_uuid,
+              'name': e.name
+            }) }));
+
+      } else if (e._delete) {
+        prom = prom.then(() => makeArvadosRequest(arvHost, arvToken,
+          '/arvados/v1/links/' + e.uuid,
+          { 'method': 'DELETE' }));
+
+      } else if (e._dirty) {
+        prom = prom.then(() => makeArvadosRequest(arvHost, arvToken,
+          '/arvados/v1/links/' + e.uuid,
+          { 'method': 'PUT',
+            'data': JSON.stringify({
+              'name': e.name
+            }) }));
+      }
+      prom = prom.catch(() => {});
+    }
+    prom = prom.then(() => {
+      this.enableControls();
+      this.fetchData();
+      this.setState({ working: false });
+    });
   }
 
-  render({ app, uuid }, { rows }) {
+  render({ app, uuid }, { rows, working }) {
     return (
       <div>
         <WBNavbarCommon app={ app } />
@@ -70,6 +149,12 @@ class WBSharingPage extends Component {
 
           <WBPickObjectDialog app={ app } ref={ this.dialogRef } />
 
+          { working ? (<div class="progress my-2">
+            <div class={ 'progress-bar progress-bar-striped progress-bar-animated' }
+              role="progressbar" aria-valuenow="100" aria-valuemin="0"
+              aria-valuemax="100" style="width: 100%"></div>
+          </div>) : null }
+
           <button class="btn btn-outline-secondary mr-2"
             onclick={ () => this.dialogRef.current.show('Select User', 'user', it => this.addEntry(it)) }>Add User...</button>
           <button class="btn btn-outline-secondary mr-2"