Implict grant for native appsWhat are Bearer Tokens and token_type in OAuth 2?Why do access tokens expire?What is the purpose of the implicit grant authorization type in OAuth 2?OAuth 2.0: Benefits and use cases — why?Why is there an “Authorization Code” flow in OAuth2 when “Implicit” flow works so well?What is the difference between the 2 workflows? When to use Authorization Code flow?What's the right OAuth 2.0 flow for a mobile appOAuth 2.0 Code Grant flowOAuth: Why is the Implicit grant type called implicit?OAuth Code Authorization grant with PKCE but for app, not user
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Implict grant for native apps
What are Bearer Tokens and token_type in OAuth 2?Why do access tokens expire?What is the purpose of the implicit grant authorization type in OAuth 2?OAuth 2.0: Benefits and use cases — why?Why is there an “Authorization Code” flow in OAuth2 when “Implicit” flow works so well?What is the difference between the 2 workflows? When to use Authorization Code flow?What's the right OAuth 2.0 flow for a mobile appOAuth 2.0 Code Grant flowOAuth: Why is the Implicit grant type called implicit?OAuth Code Authorization grant with PKCE but for app, not user
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I have something to get clarified regarding the following. The "OAuth 2.0 for Native Apps" spec says,
However, as the implicit flow cannot be protected by PKCE [RFC7636]
(which is required in Section 8.1), the use of the Implicit Flow with
native apps is NOT RECOMMENDED.
This reasoning behind why we shouldn't use the implicit grant type made me confused.
As I understand, PKCE is required for Authorization code grant because it needs 2 separate calls to get an access token and we need to make sure both these requested are done by the same app.
Please correct me if I'm wrong.
And now, since the implicit grant type doesn't need such 2 calls to get a token, I don't think we really need PKCE there. Again please correct me if I'm wrong.
That means "implicit flow does not need to be protected by PKCE". Then why does "implicit flow cannot be protected by PKCE" has become a reason above to avoid using it for native apps?
oauth oauth-2.0 native pkce
asked Mar 23 at 16:33
BeeBee
8,27853560
add a comment |
I have something to get clarified regarding the following. The "OAuth 2.0 for Native Apps" spec says,
However, as the implicit flow cannot be protected by PKCE [RFC7636]
(which is required in Section 8.1), the use of the Implicit Flow with
native apps is NOT RECOMMENDED.
This reasoning behind why we shouldn't use the implicit grant type made me confused.
As I understand, PKCE is required for Authorization code grant because it needs 2 separate calls to get an access token and we need to make sure both these requested are done by the same app.
Please correct me if I'm wrong.
And now, since the implicit grant type doesn't need such 2 calls to get a token, I don't think we really need PKCE there. Again please correct me if I'm wrong.
That means "implicit flow does not need to be protected by PKCE". Then why does "implicit flow cannot be protected by PKCE" has become a reason above to avoid using it for native apps?
oauth oauth-2.0 native pkce
asked Mar 23 at 16:33
BeeBee
8,27853560
add a comment |
I have something to get clarified regarding the following. The "OAuth 2.0 for Native Apps" spec says,
However, as the implicit flow cannot be protected by PKCE [RFC7636]
(which is required in Section 8.1), the use of the Implicit Flow with
native apps is NOT RECOMMENDED.
This reasoning behind why we shouldn't use the implicit grant type made me confused.
As I understand, PKCE is required for Authorization code grant because it needs 2 separate calls to get an access token and we need to make sure both these requested are done by the same app.
Please correct me if I'm wrong.
And now, since the implicit grant type doesn't need such 2 calls to get a token, I don't think we really need PKCE there. Again please correct me if I'm wrong.
That means "implicit flow does not need to be protected by PKCE". Then why does "implicit flow cannot be protected by PKCE" has become a reason above to avoid using it for native apps?
oauth oauth-2.0 native pkce
asked Mar 23 at 16:33
BeeBee
8,27853560
I have something to get clarified regarding the following. The "OAuth 2.0 for Native Apps" spec says,
However, as the implicit flow cannot be protected by PKCE [RFC7636]
(which is required in Section 8.1), the use of the Implicit Flow with
native apps is NOT RECOMMENDED.
This reasoning behind why we shouldn't use the implicit grant type made me confused.
As I understand, PKCE is required for Authorization code grant because it needs 2 separate calls to get an access token and we need to make sure both these requested are done by the same app.
Please correct me if I'm wrong.
And now, since the implicit grant type doesn't need such 2 calls to get a token, I don't think we really need PKCE there. Again please correct me if I'm wrong.
That means "implicit flow does not need to be protected by PKCE". Then why does "implicit flow cannot be protected by PKCE" has become a reason above to avoid using it for native apps?
oauth oauth-2.0 native pkce
oauth oauth-2.0 native pkce
asked Mar 23 at 16:33
BeeBee
8,27853560
asked Mar 23 at 16:33
BeeBee
8,27853560
asked Mar 23 at 16:33
BeeBee
8,27853560
asked Mar 23 at 16:33
BeeBee
8,27853560
asked Mar 23 at 16:33
BeeBee
8,27853560
8,27853560
add a comment |
add a comment |
1 Answer
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As I understand, PKCE is required for Authorization code grant because it needs 2 separate calls to get an access token and we need to make sure both these requested are done by the same app.
The first part of the sentence is not correct, second one ("we need to make sure...") is. PKCE is not required because of the 2 requests - the two requests make PKCE possible to implement. The problem is about who can steal the code/token before it reaches the application that requested it. The implicit flow has the same security problems as the auth code flow - described in section 8.1 of the RFC. Without PKCE, if an attacker gets a code or an access token, he can use the token right away or exchange the code for tokens first. With PKCE, the code is useless without knowing the code_verifier.
Since the implicit flow didn't get any security extension that would solve its security problems, it cannot be recommended.
And depending on what redirect URI option you choose, there may be problem with delivering the fragment part of the redirect URL (used by the implicit flow to transfer tokens) to the application. But I'm not sure about this part.
answered Mar 24 at 19:32
Ján HalašaJán Halaša
4,7521519
Thank you Ján for the explanation. The 1st part is now clear to me. However, this introduced a question about the 2nd part to me. What's the difference between the 2nd call of Authorization code grant and the implicit grant itself, in the sense of stealing the token? Why do we think the former is secure than the latter? Or don't we?
– Bee
Mar 25 at 4:08
When you call the/tokenendpoint to exchange acodefor tokens, you can do it directly, using your favorite HTTP library - there's no need for user interaction. So the response (tokens) cannot be stolen unless there is some bigger problem - such as compromised operating system or the HTTP library.
– Ján Halaša
Mar 25 at 9:19
Oh, my bad. Forgot/authorizevs/tokendifference in the 2 cases. That makes sense. Thanks.
– Bee
Mar 25 at 11:08
add a comment |
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1 Answer
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As I understand, PKCE is required for Authorization code grant because it needs 2 separate calls to get an access token and we need to make sure both these requested are done by the same app.
The first part of the sentence is not correct, second one ("we need to make sure...") is. PKCE is not required because of the 2 requests - the two requests make PKCE possible to implement. The problem is about who can steal the code/token before it reaches the application that requested it. The implicit flow has the same security problems as the auth code flow - described in section 8.1 of the RFC. Without PKCE, if an attacker gets a code or an access token, he can use the token right away or exchange the code for tokens first. With PKCE, the code is useless without knowing the code_verifier.
Since the implicit flow didn't get any security extension that would solve its security problems, it cannot be recommended.
And depending on what redirect URI option you choose, there may be problem with delivering the fragment part of the redirect URL (used by the implicit flow to transfer tokens) to the application. But I'm not sure about this part.
answered Mar 24 at 19:32
Ján HalašaJán Halaša
4,7521519
Thank you Ján for the explanation. The 1st part is now clear to me. However, this introduced a question about the 2nd part to me. What's the difference between the 2nd call of Authorization code grant and the implicit grant itself, in the sense of stealing the token? Why do we think the former is secure than the latter? Or don't we?
– Bee
Mar 25 at 4:08
When you call the/tokenendpoint to exchange acodefor tokens, you can do it directly, using your favorite HTTP library - there's no need for user interaction. So the response (tokens) cannot be stolen unless there is some bigger problem - such as compromised operating system or the HTTP library.
– Ján Halaša
Mar 25 at 9:19
Oh, my bad. Forgot/authorizevs/tokendifference in the 2 cases. That makes sense. Thanks.
– Bee
Mar 25 at 11:08
add a comment |
As I understand, PKCE is required for Authorization code grant because it needs 2 separate calls to get an access token and we need to make sure both these requested are done by the same app.
The first part of the sentence is not correct, second one ("we need to make sure...") is. PKCE is not required because of the 2 requests - the two requests make PKCE possible to implement. The problem is about who can steal the code/token before it reaches the application that requested it. The implicit flow has the same security problems as the auth code flow - described in section 8.1 of the RFC. Without PKCE, if an attacker gets a code or an access token, he can use the token right away or exchange the code for tokens first. With PKCE, the code is useless without knowing the code_verifier.
Since the implicit flow didn't get any security extension that would solve its security problems, it cannot be recommended.
And depending on what redirect URI option you choose, there may be problem with delivering the fragment part of the redirect URL (used by the implicit flow to transfer tokens) to the application. But I'm not sure about this part.
answered Mar 24 at 19:32
Ján HalašaJán Halaša
4,7521519
Thank you Ján for the explanation. The 1st part is now clear to me. However, this introduced a question about the 2nd part to me. What's the difference between the 2nd call of Authorization code grant and the implicit grant itself, in the sense of stealing the token? Why do we think the former is secure than the latter? Or don't we?
– Bee
Mar 25 at 4:08
When you call the/tokenendpoint to exchange acodefor tokens, you can do it directly, using your favorite HTTP library - there's no need for user interaction. So the response (tokens) cannot be stolen unless there is some bigger problem - such as compromised operating system or the HTTP library.
– Ján Halaša
Mar 25 at 9:19
Oh, my bad. Forgot/authorizevs/tokendifference in the 2 cases. That makes sense. Thanks.
– Bee
Mar 25 at 11:08
add a comment |
As I understand, PKCE is required for Authorization code grant because it needs 2 separate calls to get an access token and we need to make sure both these requested are done by the same app.
The first part of the sentence is not correct, second one ("we need to make sure...") is. PKCE is not required because of the 2 requests - the two requests make PKCE possible to implement. The problem is about who can steal the code/token before it reaches the application that requested it. The implicit flow has the same security problems as the auth code flow - described in section 8.1 of the RFC. Without PKCE, if an attacker gets a code or an access token, he can use the token right away or exchange the code for tokens first. With PKCE, the code is useless without knowing the code_verifier.
Since the implicit flow didn't get any security extension that would solve its security problems, it cannot be recommended.
And depending on what redirect URI option you choose, there may be problem with delivering the fragment part of the redirect URL (used by the implicit flow to transfer tokens) to the application. But I'm not sure about this part.
answered Mar 24 at 19:32
Ján HalašaJán Halaša
4,7521519
As I understand, PKCE is required for Authorization code grant because it needs 2 separate calls to get an access token and we need to make sure both these requested are done by the same app.
The first part of the sentence is not correct, second one ("we need to make sure...") is. PKCE is not required because of the 2 requests - the two requests make PKCE possible to implement. The problem is about who can steal the code/token before it reaches the application that requested it. The implicit flow has the same security problems as the auth code flow - described in section 8.1 of the RFC. Without PKCE, if an attacker gets a code or an access token, he can use the token right away or exchange the code for tokens first. With PKCE, the code is useless without knowing the code_verifier.
Since the implicit flow didn't get any security extension that would solve its security problems, it cannot be recommended.
And depending on what redirect URI option you choose, there may be problem with delivering the fragment part of the redirect URL (used by the implicit flow to transfer tokens) to the application. But I'm not sure about this part.
answered Mar 24 at 19:32
Ján HalašaJán Halaša
4,7521519
answered Mar 24 at 19:32
Ján HalašaJán Halaša
4,7521519
answered Mar 24 at 19:32
Ján HalašaJán Halaša
4,7521519
answered Mar 24 at 19:32
Ján HalašaJán Halaša
4,7521519
4,7521519
Thank you Ján for the explanation. The 1st part is now clear to me. However, this introduced a question about the 2nd part to me. What's the difference between the 2nd call of Authorization code grant and the implicit grant itself, in the sense of stealing the token? Why do we think the former is secure than the latter? Or don't we?
– Bee
Mar 25 at 4:08
When you call the/tokenendpoint to exchange acodefor tokens, you can do it directly, using your favorite HTTP library - there's no need for user interaction. So the response (tokens) cannot be stolen unless there is some bigger problem - such as compromised operating system or the HTTP library.
– Ján Halaša
Mar 25 at 9:19
Oh, my bad. Forgot/authorizevs/tokendifference in the 2 cases. That makes sense. Thanks.
– Bee
Mar 25 at 11:08
add a comment |
Thank you Ján for the explanation. The 1st part is now clear to me. However, this introduced a question about the 2nd part to me. What's the difference between the 2nd call of Authorization code grant and the implicit grant itself, in the sense of stealing the token? Why do we think the former is secure than the latter? Or don't we?
– Bee
Mar 25 at 4:08
When you call the/tokenendpoint to exchange acodefor tokens, you can do it directly, using your favorite HTTP library - there's no need for user interaction. So the response (tokens) cannot be stolen unless there is some bigger problem - such as compromised operating system or the HTTP library.
– Ján Halaša
Mar 25 at 9:19
Oh, my bad. Forgot/authorizevs/tokendifference in the 2 cases. That makes sense. Thanks.
– Bee
Mar 25 at 11:08
Thank you Ján for the explanation. The 1st part is now clear to me. However, this introduced a question about the 2nd part to me. What's the difference between the 2nd call of Authorization code grant and the implicit grant itself, in the sense of stealing the token? Why do we think the former is secure than the latter? Or don't we?
– Bee
Mar 25 at 4:08
Thank you Ján for the explanation. The 1st part is now clear to me. However, this introduced a question about the 2nd part to me. What's the difference between the 2nd call of Authorization code grant and the implicit grant itself, in the sense of stealing the token? Why do we think the former is secure than the latter? Or don't we?
– Bee
Mar 25 at 4:08
When you call the
/token endpoint to exchange a code for tokens, you can do it directly, using your favorite HTTP library - there's no need for user interaction. So the response (tokens) cannot be stolen unless there is some bigger problem - such as compromised operating system or the HTTP library.– Ján Halaša
Mar 25 at 9:19
When you call the
/token endpoint to exchange a code for tokens, you can do it directly, using your favorite HTTP library - there's no need for user interaction. So the response (tokens) cannot be stolen unless there is some bigger problem - such as compromised operating system or the HTTP library.– Ján Halaša
Mar 25 at 9:19
Oh, my bad. Forgot
/authorize vs /token difference in the 2 cases. That makes sense. Thanks.– Bee
Mar 25 at 11:08
Oh, my bad. Forgot
/authorize vs /token difference in the 2 cases. That makes sense. Thanks.– Bee
Mar 25 at 11:08
add a comment |
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