diff --git a/backend/src/routes/website-api/errors.ts b/backend/src/routes/website-api/errors.ts
index 5dcef63..f9256c9 100644
--- a/backend/src/routes/website-api/errors.ts
+++ b/backend/src/routes/website-api/errors.ts
@@ -1,3 +1,5 @@
+import { ApolloError } from 'apollo-server-fastify';
+
 export class UnknownPromptError extends Error {
   public name = 'UnknownPromptError';
 
@@ -6,10 +8,10 @@ export class UnknownPromptError extends Error {
   }
 }
 
-export class InvalidCredentialsError extends Error {
-  public name = 'InvalidCredentialsError';
+export class InvalidVulcanCredentialsError extends ApolloError {
+  public name = 'InvalidVulcanCredentialsError';
 
   public constructor() {
-    super('User with provided credentials not found');
+    super('Invalid vulcan credentials', 'INVALID_VULCAN_CREDENTIALS');
   }
 }
diff --git a/backend/src/routes/website-api/resolvers/login-resolver.ts b/backend/src/routes/website-api/resolvers/login-resolver.ts
index 2b2ff0b..8a2b4cc 100644
--- a/backend/src/routes/website-api/resolvers/login-resolver.ts
+++ b/backend/src/routes/website-api/resolvers/login-resolver.ts
@@ -6,9 +6,9 @@ import {
   Arg, Ctx, Mutation, Resolver,
 } from 'type-graphql';
 import {
-  encryptSymmetrical, encryptWithPublicKey, generatePrivatePublicPair, requireEnvHex,
+  encryptSymmetrical, encryptWithPublicKey, generatePrivatePublicPair, isObject, requireEnvHex,
 } from '../../../utils';
-import { UnknownPromptError } from '../errors';
+import { InvalidVulcanCredentialsError, UnknownPromptError } from '../errors';
 import LoginResult from '../models/login-result';
 import type LoginResultStudent from '../models/login-result-student';
 import type { WebsiteAPIContext } from '../types';
@@ -29,7 +29,12 @@ export default class LoginResolver {
       username,
       password,
     }));
-    await client.login();
+    try {
+      await client.login();
+    } catch (error) {
+      if (isObject(error) && error.name === 'InvalidCredentialsError') throw new InvalidVulcanCredentialsError();
+      throw error;
+    }
     const diaryList = await client.getDiaryList();
     const { privateKey, publicKey } = await generatePrivatePublicPair();
     const encryptedPrivateKey = encryptSymmetrical(
diff --git a/website/codegen.yml b/website/codegen.yml
index 1ae4473..a4d6b29 100644
--- a/website/codegen.yml
+++ b/website/codegen.yml
@@ -1,6 +1,7 @@
 schema: http://localhost:3000/api/website/graphql
 documents:
   - src/graphql/queries/get-prompt-info.ts
+  - src/graphql/mutations/login.ts
 generates:
   ./src/graphql/generated.ts:
     plugins:
diff --git a/website/src/compontents/authenticate-prompt-windows/login-window.vue b/website/src/compontents/authenticate-prompt-windows/login-window.vue
new file mode 100644
index 0000000..7cce912
--- /dev/null
+++ b/website/src/compontents/authenticate-prompt-windows/login-window.vue
@@ -0,0 +1,101 @@
+<template>
+  <div>
+    <v-form @submit.prevent="submit">
+      <v-card-title class="d-block">Zaloguj się do konta VULCAN UONET+</v-card-title>
+      <div class="mx-4">
+        <v-select v-model="host" label="Odmiana dziennika" :items="hosts" outlined />
+        <v-text-field v-model="username" label="Nazwa użytkownika" outlined />
+        <v-text-field v-model="password" type="password" label="Hasło" outlined />
+      </div>
+      <v-alert type="error" class="mx-2" :value="error === 'invalid-credentials'">
+        Dane logowania są nieprawidłowe
+      </v-alert>
+      <v-alert type="error" class="mx-2" :value="error === 'other'">
+        Podczas logowania wystąpił błąd
+      </v-alert>
+      <v-card-actions>
+        <v-btn color="primary" text outlined @click="back" :disabled="loading">
+          Wróć
+        </v-btn>
+        <v-spacer />
+        <v-btn color="primary" :loading="loading" type="submit">
+          Zaloguj się
+        </v-btn>
+      </v-card-actions>
+    </v-form>
+  </div>
+</template>
+
+<script lang="ts">
+import { Component, Prop, Vue } from 'vue-property-decorator';
+import { PromptInfo } from '@/types';
+import { hasErrorCode, sdk } from '@/pages/authenticate-prompt/sdk';
+
+@Component({
+  name: 'LoginWindow',
+})
+export default class LoginWindow extends Vue {
+  @Prop({
+    required: true,
+    type: Object,
+  })
+  promptInfo!: PromptInfo;
+
+  readonly hosts = [
+    {
+      text: 'Vulcan',
+      value: 'vulcan.net.pl',
+    },
+    {
+      text: 'Fakelog',
+      value: 'fakelog.cf',
+    },
+  ]
+
+  host = '';
+
+  username = '';
+
+  password = '';
+
+  loading = false;
+
+  error: 'invalid-credentials' | 'other' | null = null;
+
+  reset() {
+    this.host = 'fakelog.cf';
+    this.username = '';
+    this.password = '';
+  }
+
+  async submit() {
+    if (this.loading) return;
+    this.error = null;
+    this.loading = true;
+    try {
+      const { login } = await sdk.Login({
+        promptId: this.promptInfo.id,
+        host: this.host,
+        username: this.username,
+        password: this.password,
+      });
+      const { students, encryptedPrivateKey } = login;
+      console.log(students, encryptedPrivateKey);
+      this.reset();
+    } catch (error) {
+      console.error(error);
+      this.error = hasErrorCode(error, 'INVALID_VULCAN_CREDENTIALS') ? 'invalid-credentials' : 'other';
+    }
+    this.loading = false;
+  }
+
+  back() {
+    if (this.loading) return;
+    this.$emit('back');
+  }
+
+  created() {
+    this.reset();
+  }
+}
+</script>
diff --git a/website/src/compontents/authenticate-prompt-windows/overview-window.vue b/website/src/compontents/authenticate-prompt-windows/overview-window.vue
new file mode 100644
index 0000000..f45bd98
--- /dev/null
+++ b/website/src/compontents/authenticate-prompt-windows/overview-window.vue
@@ -0,0 +1,102 @@
+<template>
+  <div>
+    <div class="pt-16">
+      <h2 class="text-subtitle-1 text--secondary mt-6 mb-2 px-4">
+        Aplikacja
+        <span class="text--primary">{{ promptInfo.application.name }}</span>
+        chce uzyskać dostęp do twojego konta VULCAN UONET+ przez Wulkanowy Bridge
+      </h2>
+      <v-subheader>Uprawnienia aplikacji</v-subheader>
+      <v-list subheader>
+        <v-list-item v-for="item in scopeItems" :key="item.key">
+          <v-list-item-icon>
+            <v-icon>{{ item.icon }}</v-icon>
+          </v-list-item-icon>
+          <v-list-item-content>
+            <v-list-item-title>
+              {{ item.title }}
+            </v-list-item-title>
+            <v-list-item-subtitle v-if="item.subtitle !== undefined">
+              {{ item.subtitle }}
+            </v-list-item-subtitle>
+          </v-list-item-content>
+        </v-list-item>
+      </v-list>
+      <v-alert color="info" text class="mb-2 mx-2">
+        <span class="font-weight-medium">{{ promptInfo.application.name }}</span>
+        nie zobaczy twojego hasła
+        <template #append>
+          <!-- TODO: Implement -->
+          <v-btn text color="info">Więcej</v-btn>
+        </template>
+      </v-alert>
+    </div>
+    <v-card-actions>
+      <v-btn color="primary" text outlined :href="denyUrl">
+        Odmów
+      </v-btn>
+      <v-spacer />
+      <v-btn color="primary" @click="next">
+        Dalej
+      </v-btn>
+    </v-card-actions>
+  </div>
+</template>
+
+<script lang="ts">
+import { Component, Prop, Vue } from 'vue-property-decorator';
+import { PromptInfo } from '@/types';
+
+@Component({
+  name: 'OverviewWindow',
+})
+export default class OverviewWindow extends Vue {
+  @Prop({
+    required: true,
+    type: Object,
+  })
+  promptInfo!: PromptInfo;
+
+  readonly scopeDescriptions: {
+    key: string;
+    title: string;
+    subtitle?: string;
+    icon: string;
+  }[] = [
+    {
+      key: 'timetable',
+      title: 'Plan lekcji',
+      icon: 'mdi-timetable',
+    },
+    {
+      key: 'grades',
+      title: 'Oceny i punkty',
+      subtitle: 'Oceny cząstkowe, końcowe, opisowe oraz punkty',
+      icon: 'mdi-numeric-6-box-multiple-outline',
+    },
+    {
+      key: 'notes',
+      title: 'Uwagi i pochwały',
+      icon: 'mdi-note-text-outline',
+    },
+    {
+      key: 'achievements',
+      title: 'Osiągnięcia',
+      icon: 'mdi-trophy-outline',
+    },
+  ]
+
+  get scopeItems() {
+    return this.scopeDescriptions
+      .filter(({ key }) => this.promptInfo.scopes.includes(key));
+  }
+
+  get denyUrl() {
+    return `/api/website/deny?prompt_id=${this.promptInfo.id}`;
+  }
+
+  next() {
+    this.$emit('next');
+  }
+}
+</script>
diff --git a/website/src/graphql/generated.ts b/website/src/graphql/generated.ts
index 2c81eb1..8a5785e 100644
--- a/website/src/graphql/generated.ts
+++ b/website/src/graphql/generated.ts
@@ -71,6 +71,25 @@ export type LoginResultStudent = {
   name: Scalars['String'];
 };
 
+export type LoginMutationVariables = Exact<{
+  promptId: Scalars['String'];
+  host: Scalars['String'];
+  username: Scalars['String'];
+  password: Scalars['String'];
+}>;
+
+export type LoginMutation = (
+  { __typename?: 'Mutation' }
+  & { login: (
+    { __typename?: 'LoginResult' }
+    & Pick<LoginResult, 'encryptedPrivateKey'>
+    & { students: Array<(
+      { __typename?: 'LoginResultStudent' }
+      & Pick<LoginResultStudent, 'studentId' | 'name'>
+    )>; }
+  ); }
+);
+
 export type GetPromptInfoQueryVariables = Exact<{
   promptId: Scalars['String'];
 }>;
@@ -79,7 +98,7 @@ export type GetPromptInfoQuery = (
   { __typename?: 'Query' }
   & { promptInfo: (
     { __typename?: 'PromptInfo' }
-    & Pick<PromptInfo, 'scopes' | 'studentsMode'>
+    & Pick<PromptInfo, 'id' | 'scopes' | 'studentsMode'>
     & { application: (
       { __typename?: 'PromptInfoApplication' }
       & Pick<PromptInfoApplication, 'name' | 'iconUrl' | 'iconColor' | 'verified'>
@@ -87,9 +106,26 @@ export type GetPromptInfoQuery = (
   ); }
 );
 
+export const LoginDocument = gql`
+    mutation Login($promptId: String!, $host: String!, $username: String!, $password: String!) {
+  login(
+    host: $host
+    password: $password
+    username: $username
+    promptId: $promptId
+  ) {
+    encryptedPrivateKey
+    students {
+      studentId
+      name
+    }
+  }
+}
+    `;
 export const GetPromptInfoDocument = gql`
     query GetPromptInfo($promptId: String!) {
   promptInfo(promptId: $promptId) {
+    id
     scopes
     studentsMode
     application {
@@ -107,6 +143,9 @@ export type SdkFunctionWrapper = <T>(action: () => Promise<T>) => Promise<T>;
 const defaultWrapper: SdkFunctionWrapper = (sdkFunction) => sdkFunction();
 export function getSdk(client: GraphQLClient, withWrapper: SdkFunctionWrapper = defaultWrapper) {
   return {
+    Login(variables: LoginMutationVariables, requestHeaders?: Headers): Promise<LoginMutation> {
+      return withWrapper(() => client.request<LoginMutation>(print(LoginDocument), variables, requestHeaders));
+    },
     GetPromptInfo(variables: GetPromptInfoQueryVariables, requestHeaders?: Headers): Promise<GetPromptInfoQuery> {
       return withWrapper(() => client.request<GetPromptInfoQuery>(print(GetPromptInfoDocument), variables, requestHeaders));
     },
diff --git a/website/src/graphql/mutations/login.ts b/website/src/graphql/mutations/login.ts
new file mode 100644
index 0000000..e275bee
--- /dev/null
+++ b/website/src/graphql/mutations/login.ts
@@ -0,0 +1,12 @@
+import gql from 'graphql-tag';
+
+export default gql`mutation Login($promptId: String!, $host: String!, $username: String!, $password: String!) {
+  login(host: $host, password: $password, username: $username, promptId: $promptId) {
+    encryptedPrivateKey
+    students {
+      studentId
+      name
+    }
+  }
+}
+`;
diff --git a/website/src/graphql/queries/get-prompt-info.ts b/website/src/graphql/queries/get-prompt-info.ts
index f78a878..4234e49 100644
--- a/website/src/graphql/queries/get-prompt-info.ts
+++ b/website/src/graphql/queries/get-prompt-info.ts
@@ -2,6 +2,7 @@ import gql from 'graphql-tag';
 
 export default gql`query GetPromptInfo($promptId: String!) {
   promptInfo(promptId: $promptId) {
+    id
     scopes
     studentsMode
     application {
@@ -11,4 +12,5 @@ export default gql`query GetPromptInfo($promptId: String!) {
       verified
     }
   }
-}`;
+}
+`;
diff --git a/website/src/pages/authenticate-prompt/app.vue b/website/src/pages/authenticate-prompt/app.vue
index 1990459..6eb9c5b 100644
--- a/website/src/pages/authenticate-prompt/app.vue
+++ b/website/src/pages/authenticate-prompt/app.vue
@@ -69,62 +69,13 @@
             </div>
             <v-window :value="step">
               <v-window-item :value="1">
-                <div>
-                  <div class="pt-16">
-                    <h2 class="text-subtitle-1 text--secondary mt-6 mb-2 px-4">
-                      Aplikacja
-                      <span class="text--primary">{{ promptInfo.application.name }}</span>
-                      chce uzyskać dostęp do twojego konta VULCAN UONET+ przez Wulkanowy Bridge
-                    </h2>
-                    <v-subheader>Uprawnienia aplikacji</v-subheader>
-                    <v-list subheader>
-                      <v-list-item v-for="item in scopeItems" :key="item.key">
-                        <v-list-item-icon>
-                          <v-icon>{{ item.icon }}</v-icon>
-                        </v-list-item-icon>
-                        <v-list-item-content>
-                          <v-list-item-title>
-                            {{ item.title }}
-                          </v-list-item-title>
-                          <v-list-item-subtitle v-if="item.subtitle !== undefined">
-                            {{ item.subtitle }}
-                          </v-list-item-subtitle>
-                        </v-list-item-content>
-                      </v-list-item>
-                    </v-list>
-                    <v-alert color="info" text class="mb-2 mx-2">
-                      <span class="font-weight-medium">{{ promptInfo.application.name }}</span>
-                      nie zobaczy twojego hasła
-                      <template #append>
-                        <!-- TODO: Implement -->
-                        <v-btn text color="info">Więcej</v-btn>
-                      </template>
-                    </v-alert>
-                    <v-divider />
-                  </div>
-                  <v-card-actions>
-                    <v-btn color="primary" text outlined :href="denyUrl">
-                      Odmów
-                    </v-btn>
-                    <v-spacer />
-                    <v-btn color="primary" @click="beginLogin">
-                      Dalej
-                    </v-btn>
-                  </v-card-actions>
-                </div>
+                <overview-window
+                  @next="overviewNext"
+                  :promptInfo="promptInfo"
+                />
               </v-window-item>
-              <v-window-item :value="2">
-                <div>
-                  <v-card-actions>
-                    <v-btn color="primary" text outlined @click="goBack">
-                      Wróć
-                    </v-btn>
-                    <v-spacer />
-                    <v-btn color="primary">
-                      Zaloguj się
-                    </v-btn>
-                  </v-card-actions>
-                </div>
+              <v-window-item :value="2" eager>
+                <login-window @back="loginBack" ref="loginWindow" :prompt-info="promptInfo" />
               </v-window-item>
             </v-window>
           </v-card>
@@ -162,31 +113,19 @@
 </style>
 
 <script lang="ts">
-import { Component, Vue } from 'vue-property-decorator';
-import { GraphQLClient } from 'graphql-request';
-import { getSdk } from '@/graphql/generated';
-
-export enum StudentsMode {
-  None = 'none',
-  One = 'one',
-  Many = 'many',
-}
-
-export interface PromptInfo {
-  scopes: string[];
-  studentsMode: StudentsMode;
-  application: {
-    name: string;
-    iconUrl: string | null;
-    iconColor: string;
-    verified: boolean;
-  };
-}
+import { Component, Ref, Vue } from 'vue-property-decorator';
+import OverviewWindow from '@/compontents/authenticate-prompt-windows/overview-window.vue';
+import { PromptInfo } from '@/types';
+import LoginWindow from '@/compontents/authenticate-prompt-windows/login-window.vue';
+import { sdk } from '@/pages/authenticate-prompt/sdk';
 
 @Component({
   name: 'AuthenticatePromptApp',
+  components: { LoginWindow, OverviewWindow },
 })
 export default class AuthenticatePromptApp extends Vue {
+  @Ref() readonly loginWindow!: LoginWindow
+
   promptInfo: PromptInfo | null = null;
 
   promptId: string | null = null;
@@ -195,55 +134,12 @@ export default class AuthenticatePromptApp extends Vue {
 
   step = 1;
 
-  readonly scopeDescriptions: {
-    key: string;
-    title: string;
-    subtitle?: string;
-    icon: string;
-  }[] = [
-    {
-      key: 'timetable',
-      title: 'Plan lekcji',
-      icon: 'mdi-timetable',
-    },
-    {
-      key: 'grades',
-      title: 'Oceny i punkty',
-      subtitle: 'Oceny cząstkowe, końcowe, opisowe oraz punkty',
-      icon: 'mdi-numeric-6-box-multiple-outline',
-    },
-    {
-      key: 'notes',
-      title: 'Uwagi i pochwały',
-      icon: 'mdi-note-text-outline',
-    },
-    {
-      key: 'achievements',
-      title: 'Osiągnięcia',
-      icon: 'mdi-trophy-outline',
-    },
-  ]
-
-  get scopeItems() {
-    if (this.promptInfo === null) return undefined;
-    return this.scopeDescriptions
-      .filter(({ key }) => this.promptInfo?.scopes?.includes(key) ?? false);
-  }
-
-  get denyUrl() {
-    if (!this.promptId) return undefined;
-    return `/api/website/deny?prompt_id=${this.promptId}`;
-  }
-
   async loadPromptInfo() {
     this.promptInfoError = false;
     this.promptInfo = null;
 
     if (!this.promptId) return;
 
-    const client = new GraphQLClient('/api/website/graphql');
-    const sdk = getSdk(client);
-
     try {
       const { promptInfo } = await sdk.GetPromptInfo({
         promptId: this.promptId,
@@ -262,12 +158,13 @@ export default class AuthenticatePromptApp extends Vue {
     await this.loadPromptInfo();
   }
 
-  goBack() {
-    this.step -= 1;
+  loginBack() {
+    this.step = 1;
   }
 
-  beginLogin() {
+  overviewNext() {
     this.step = 2;
+    this.loginWindow.reset();
   }
 }
 </script>
diff --git a/website/src/pages/authenticate-prompt/sdk.ts b/website/src/pages/authenticate-prompt/sdk.ts
new file mode 100644
index 0000000..f18e380
--- /dev/null
+++ b/website/src/pages/authenticate-prompt/sdk.ts
@@ -0,0 +1,18 @@
+import { ClientError, GraphQLClient } from 'graphql-request';
+import { getSdk } from '@/graphql/generated';
+import { GraphQLError } from 'graphql-request/dist/types';
+
+const client = new GraphQLClient('/api/website/graphql');
+export const sdk = getSdk(client);
+
+export interface GraphQLErrorFull extends GraphQLError {
+  extensions?: {
+    code?: string;
+  };
+}
+
+export function hasErrorCode(error: unknown, code: string): boolean {
+  if (!(error instanceof ClientError)) return false;
+  return error.response.errors
+    ?.some((resError: GraphQLErrorFull) => resError.extensions?.code === code) ?? false;
+}
diff --git a/website/src/types.ts b/website/src/types.ts
new file mode 100644
index 0000000..acf5962
--- /dev/null
+++ b/website/src/types.ts
@@ -0,0 +1,17 @@
+export enum StudentsMode {
+  None = 'none',
+  One = 'one',
+  Many = 'many',
+}
+
+export interface PromptInfo {
+  id: string;
+  scopes: string[];
+  studentsMode: StudentsMode;
+  application: {
+    name: string;
+    iconUrl: string | null;
+    iconColor: string;
+    verified: boolean;
+  };
+}