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Authentication Overview updates (#22113)

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Luke Latham 2021-04-23 12:26:10 -05:00 committed by GitHub
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aspnetcore/security/authentication/index.md
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@ -43,17 +43,17 @@ The Authentication middleware is added in `Startup.Configure` by calling the <xr
* After `UseRouting`, so that route information is available for authentication decisions.
* Before `UseEndpoints`, so that users are authenticated before accessing the endpoints.
## Authentication Concepts
## Authentication concepts
Authentication is responsible for providing the <xref:System.Security.Claims.ClaimsPrincipal> for authorization to make permission decisions against. There are multiple authentication scheme approaches to select which authentication handler is responsible for generating the correct set of claims:
* [Authentication scheme](xref:security/authorization/limitingidentitybyscheme), also discussed in the next section.
* [Authentication scheme](#authentication-scheme)
* The default authentication scheme, discussed in the next section.
* Directly set [HttpContext.User](xref:Microsoft.AspNetCore.Http.HttpContext.User).
* Directly set <xref:Microsoft.AspNetCore.Http.HttpContext.User?displayProperty=nameWithType>.
There is no automatic probing of schemes. If the default scheme is not specified, the scheme must be specified in the authorize attribute, otherwise, the following error is thrown:
InvalidOperationException: No authenticationScheme was specified, and there was no DefaultAuthenticateScheme found. The default schemes can be set using either AddAuthentication(string defaultScheme) or AddAuthentication(Action&lt;AuthenticationOptions&gt; configureOptions).
> InvalidOperationException: No authenticationScheme was specified, and there was no DefaultAuthenticateScheme found. The default schemes can be set using either AddAuthentication(string defaultScheme) or AddAuthentication(Action\<AuthenticationOptions> configureOptions).
### Authentication scheme